path: root/parse.y

/**********************************************************************

  parse.y -

  $Author$
  created at: Fri May 28 18:02:42 JST 1993

  Copyright (C) 1993-2007 Yukihiro Matsumoto

**********************************************************************/

%{

#if !YYPURE
# error needs pure parser
#endif
#define YYDEBUG 1
#define YYERROR_VERBOSE 1
#define YYSTACK_USE_ALLOCA 0
#define YYLTYPE rb_code_location_t
#define YYLTYPE_IS_DECLARED 1

#include "ruby/internal/config.h"

#include <ctype.h>
#include <errno.h>
#include <stdio.h>

struct lex_context;

#include "internal.h"
#include "internal/compile.h"
#include "internal/compilers.h"
#include "internal/complex.h"
#include "internal/error.h"
#include "internal/hash.h"
#include "internal/imemo.h"
#include "internal/io.h"
#include "internal/numeric.h"
#include "internal/parse.h"
#include "internal/rational.h"
#include "internal/re.h"
#include "internal/symbol.h"
#include "internal/thread.h"
#include "internal/util.h"
#include "internal/variable.h"
#include "node.h"
#include "probes.h"
#include "regenc.h"
#include "ruby/encoding.h"
#include "ruby/regex.h"
#include "ruby/ruby.h"
#include "ruby/st.h"
#include "ruby/util.h"
#include "ruby/ractor.h"
#include "symbol.h"

enum shareability {
    shareable_none,
    shareable_literal,
    shareable_everything,
};

struct lex_context {
    unsigned int in_defined: 1;
    unsigned int in_kwarg: 1;
    unsigned int in_def: 1;
    unsigned int in_class: 1;
    BITFIELD(enum shareability, shareable_constant_value, 2);
};

#include "parse.h"

#define NO_LEX_CTXT (struct lex_context){0}

#define AREF(ary, i) RARRAY_AREF(ary, i)

#ifndef WARN_PAST_SCOPE
# define WARN_PAST_SCOPE 0
#endif

#define TAB_WIDTH 8

#define yydebug (p->debug)	/* disable the global variable definition */

#define YYMALLOC(size)		rb_parser_malloc(p, (size))
#define YYREALLOC(ptr, size)	rb_parser_realloc(p, (ptr), (size))
#define YYCALLOC(nelem, size)	rb_parser_calloc(p, (nelem), (size))
#define YYFREE(ptr)		rb_parser_free(p, (ptr))
#define YYFPRINTF		rb_parser_printf
#define YYPRINT(out, tok, val)	parser_token_value_print(p, (tok), &(val))
#define YY_LOCATION_PRINT(File, loc) \
     rb_parser_printf(p, "%d.%d-%d.%d", \
		      (loc).beg_pos.lineno, (loc).beg_pos.column,\
		      (loc).end_pos.lineno, (loc).end_pos.column)
#define YYLLOC_DEFAULT(Current, Rhs, N)					\
    do									\
      if (N)								\
	{								\
	  (Current).beg_pos = YYRHSLOC(Rhs, 1).beg_pos;			\
	  (Current).end_pos = YYRHSLOC(Rhs, N).end_pos;			\
	}								\
      else								\
        {                                                               \
          (Current).beg_pos = YYRHSLOC(Rhs, 0).end_pos;                 \
          (Current).end_pos = YYRHSLOC(Rhs, 0).end_pos;                 \
        }                                                               \
    while (0)

#define RUBY_SET_YYLLOC_FROM_STRTERM_HEREDOC(Current)			\
    rb_parser_set_location_from_strterm_heredoc(p, &p->lex.strterm->u.heredoc, &(Current))
#define RUBY_SET_YYLLOC_OF_NONE(Current)					\
    rb_parser_set_location_of_none(p, &(Current))
#define RUBY_SET_YYLLOC(Current)					\
    rb_parser_set_location(p, &(Current))
#define RUBY_INIT_YYLLOC() \
    { \
	{p->ruby_sourceline, (int)(p->lex.ptok - p->lex.pbeg)}, \
	{p->ruby_sourceline, (int)(p->lex.pcur - p->lex.pbeg)}, \
    }

enum lex_state_bits {
    EXPR_BEG_bit,		/* ignore newline, +/- is a sign. */
    EXPR_END_bit,		/* newline significant, +/- is an operator. */
    EXPR_ENDARG_bit,		/* ditto, and unbound braces. */
    EXPR_ENDFN_bit,		/* ditto, and unbound braces. */
    EXPR_ARG_bit,		/* newline significant, +/- is an operator. */
    EXPR_CMDARG_bit,		/* newline significant, +/- is an operator. */
    EXPR_MID_bit,		/* newline significant, +/- is an operator. */
    EXPR_FNAME_bit,		/* ignore newline, no reserved words. */
    EXPR_DOT_bit,		/* right after `.' or `::', no reserved words. */
    EXPR_CLASS_bit,		/* immediate after `class', no here document. */
    EXPR_LABEL_bit,		/* flag bit, label is allowed. */
    EXPR_LABELED_bit,		/* flag bit, just after a label. */
    EXPR_FITEM_bit,		/* symbol literal as FNAME. */
    EXPR_MAX_STATE
};
/* examine combinations */
enum lex_state_e {
#define DEF_EXPR(n) EXPR_##n = (1 << EXPR_##n##_bit)
    DEF_EXPR(BEG),
    DEF_EXPR(END),
    DEF_EXPR(ENDARG),
    DEF_EXPR(ENDFN),
    DEF_EXPR(ARG),
    DEF_EXPR(CMDARG),
    DEF_EXPR(MID),
    DEF_EXPR(FNAME),
    DEF_EXPR(DOT),
    DEF_EXPR(CLASS),
    DEF_EXPR(LABEL),
    DEF_EXPR(LABELED),
    DEF_EXPR(FITEM),
    EXPR_VALUE = EXPR_BEG,
    EXPR_BEG_ANY  =  (EXPR_BEG | EXPR_MID | EXPR_CLASS),
    EXPR_ARG_ANY  =  (EXPR_ARG | EXPR_CMDARG),
    EXPR_END_ANY  =  (EXPR_END | EXPR_ENDARG | EXPR_ENDFN),
    EXPR_NONE = 0
};
#define IS_lex_state_for(x, ls)	((x) & (ls))
#define IS_lex_state_all_for(x, ls) (((x) & (ls)) == (ls))
#define IS_lex_state(ls)	IS_lex_state_for(p->lex.state, (ls))
#define IS_lex_state_all(ls)	IS_lex_state_all_for(p->lex.state, (ls))

# define SET_LEX_STATE(ls) \
    (p->lex.state = \
     (p->debug ? \
      rb_parser_trace_lex_state(p, p->lex.state, (ls), __LINE__) : \
      (enum lex_state_e)(ls)))

typedef VALUE stack_type;

static const rb_code_location_t NULL_LOC = { {0, -1}, {0, -1} };

# define SHOW_BITSTACK(stack, name) (p->debug ? rb_parser_show_bitstack(p, stack, name, __LINE__) : (void)0)
# define BITSTACK_PUSH(stack, n) (((p->stack) = ((p->stack)<<1)|((n)&1)), SHOW_BITSTACK(p->stack, #stack"(push)"))
# define BITSTACK_POP(stack)	 (((p->stack) = (p->stack) >> 1), SHOW_BITSTACK(p->stack, #stack"(pop)"))
# define BITSTACK_SET_P(stack)	 (SHOW_BITSTACK(p->stack, #stack), (p->stack)&1)
# define BITSTACK_SET(stack, n)	 ((p->stack)=(n), SHOW_BITSTACK(p->stack, #stack"(set)"))

/* A flag to identify keyword_do_cond, "do" keyword after condition expression.
   Examples: `while ... do`, `until ... do`, and `for ... in ... do` */
#define COND_PUSH(n)	BITSTACK_PUSH(cond_stack, (n))
#define COND_POP()	BITSTACK_POP(cond_stack)
#define COND_P()	BITSTACK_SET_P(cond_stack)
#define COND_SET(n)	BITSTACK_SET(cond_stack, (n))

/* A flag to identify keyword_do_block; "do" keyword after command_call.
   Example: `foo 1, 2 do`. */
#define CMDARG_PUSH(n)	BITSTACK_PUSH(cmdarg_stack, (n))
#define CMDARG_POP()	BITSTACK_POP(cmdarg_stack)
#define CMDARG_P()	BITSTACK_SET_P(cmdarg_stack)
#define CMDARG_SET(n)	BITSTACK_SET(cmdarg_stack, (n))

struct vtable {
    ID *tbl;
    int pos;
    int capa;
    struct vtable *prev;
};

struct local_vars {
    struct vtable *args;
    struct vtable *vars;
    struct vtable *used;
# if WARN_PAST_SCOPE
    struct vtable *past;
# endif
    struct local_vars *prev;
# ifndef RIPPER
    struct {
	NODE *outer, *inner, *current;
    } numparam;
# endif
};

enum {
    ORDINAL_PARAM = -1,
    NO_PARAM = 0,
    NUMPARAM_MAX = 9,
};

#define NUMPARAM_ID_P(id) numparam_id_p(id)
#define NUMPARAM_ID_TO_IDX(id) (unsigned int)(((id) >> ID_SCOPE_SHIFT) - tNUMPARAM_1 + 1)
#define NUMPARAM_IDX_TO_ID(idx) TOKEN2LOCALID((tNUMPARAM_1 + (idx) - 1))
static int
numparam_id_p(ID id)
{
    if (!is_local_id(id)) return 0;
    unsigned int idx = NUMPARAM_ID_TO_IDX(id);
    return idx > 0 && idx <= NUMPARAM_MAX;
}
static void numparam_name(struct parser_params *p, ID id);

#define DVARS_INHERIT ((void*)1)
#define DVARS_TOPSCOPE NULL
#define DVARS_TERMINAL_P(tbl) ((tbl) == DVARS_INHERIT || (tbl) == DVARS_TOPSCOPE)

typedef struct token_info {
    const char *token;
    rb_code_position_t beg;
    int indent;
    int nonspc;
    struct token_info *next;
} token_info;

typedef struct rb_strterm_struct rb_strterm_t;

/*
    Structure of Lexer Buffer:

 lex.pbeg     lex.ptok     lex.pcur     lex.pend
    |            |            |            |
    |------------+------------+------------|
                 |<---------->|
                     token
*/
struct parser_params {
    rb_imemo_tmpbuf_t *heap;

    YYSTYPE *lval;

    struct {
	rb_strterm_t *strterm;
	VALUE (*gets)(struct parser_params*,VALUE);
	VALUE input;
	VALUE prevline;
	VALUE lastline;
	VALUE nextline;
	const char *pbeg;
	const char *pcur;
	const char *pend;
	const char *ptok;
	union {
	    long ptr;
	    VALUE (*call)(VALUE, int);
	} gets_;
	enum lex_state_e state;
	/* track the nest level of any parens "()[]{}" */
	int paren_nest;
	/* keep p->lex.paren_nest at the beginning of lambda "->" to detect tLAMBEG and keyword_do_LAMBDA */
	int lpar_beg;
	/* track the nest level of only braces "{}" */
	int brace_nest;
    } lex;
    stack_type cond_stack;
    stack_type cmdarg_stack;
    int tokidx;
    int toksiz;
    int tokline;
    int heredoc_end;
    int heredoc_indent;
    int heredoc_line_indent;
    char *tokenbuf;
    struct local_vars *lvtbl;
    st_table *pvtbl;
    st_table *pktbl;
    int line_count;
    int ruby_sourceline;	/* current line no. */
    const char *ruby_sourcefile; /* current source file */
    VALUE ruby_sourcefile_string;
    rb_encoding *enc;
    token_info *token_info;
    VALUE case_labels;
    VALUE compile_option;

    VALUE debug_buffer;
    VALUE debug_output;

    ID cur_arg;

    rb_ast_t *ast;
    int node_id;

    int max_numparam;

    struct lex_context ctxt;

    unsigned int command_start:1;
    unsigned int eofp: 1;
    unsigned int ruby__end__seen: 1;
    unsigned int debug: 1;
    unsigned int has_shebang: 1;
    unsigned int token_seen: 1;
    unsigned int token_info_enabled: 1;
# if WARN_PAST_SCOPE
    unsigned int past_scope_enabled: 1;
# endif
    unsigned int error_p: 1;
    unsigned int cr_seen: 1;

#ifndef RIPPER
    /* Ruby core only */

    unsigned int do_print: 1;
    unsigned int do_loop: 1;
    unsigned int do_chomp: 1;
    unsigned int do_split: 1;

    NODE *eval_tree_begin;
    NODE *eval_tree;
    VALUE error_buffer;
    VALUE debug_lines;
    const struct rb_iseq_struct *parent_iseq;
#else
    /* Ripper only */

    struct {
	VALUE token;
	int line;
	int col;
    } delayed;

    VALUE value;
    VALUE result;
    VALUE parsing_thread;
#endif
};

#define intern_cstr(n,l,en) rb_intern3(n,l,en)

#define STR_NEW(ptr,len) rb_enc_str_new((ptr),(len),p->enc)
#define STR_NEW0() rb_enc_str_new(0,0,p->enc)
#define STR_NEW2(ptr) rb_enc_str_new((ptr),strlen(ptr),p->enc)
#define STR_NEW3(ptr,len,e,func) parser_str_new((ptr),(len),(e),(func),p->enc)
#define TOK_INTERN() intern_cstr(tok(p), toklen(p), p->enc)

static st_table *
push_pvtbl(struct parser_params *p)
{
    st_table *tbl = p->pvtbl;
    p->pvtbl = st_init_numtable();
    return tbl;
}

static void
pop_pvtbl(struct parser_params *p, st_table *tbl)
{
    st_free_table(p->pvtbl);
    p->pvtbl = tbl;
}

static st_table *
push_pktbl(struct parser_params *p)
{
    st_table *tbl = p->pktbl;
    p->pktbl = 0;
    return tbl;
}

static void
pop_pktbl(struct parser_params *p, st_table *tbl)
{
    if (p->pktbl) st_free_table(p->pktbl);
    p->pktbl = tbl;
}

static int parser_yyerror(struct parser_params*, const YYLTYPE *yylloc, const char*);
#define yyerror0(msg) parser_yyerror(p, NULL, (msg))
#define yyerror1(loc, msg) parser_yyerror(p, (loc), (msg))
#define yyerror(yylloc, p, msg) parser_yyerror(p, yylloc, msg)
#define token_flush(ptr) ((ptr)->lex.ptok = (ptr)->lex.pcur)

static void token_info_setup(token_info *ptinfo, const char *ptr, const rb_code_location_t *loc);
static void token_info_push(struct parser_params*, const char *token, const rb_code_location_t *loc);
static void token_info_pop(struct parser_params*, const char *token, const rb_code_location_t *loc);
static void token_info_warn(struct parser_params *p, const char *token, token_info *ptinfo_beg, int same, const rb_code_location_t *loc);
static void token_info_drop(struct parser_params *p, const char *token, rb_code_position_t beg_pos);

#ifdef RIPPER
#define compile_for_eval	(0)
#else
#define compile_for_eval	(p->parent_iseq != 0)
#endif

#define token_column		((int)(p->lex.ptok - p->lex.pbeg))

#define CALL_Q_P(q) ((q) == TOKEN2VAL(tANDDOT))
#define NODE_CALL_Q(q) (CALL_Q_P(q) ? NODE_QCALL : NODE_CALL)
#define NEW_QCALL(q,r,m,a,loc) NEW_NODE(NODE_CALL_Q(q),r,m,a,loc)

#define lambda_beginning_p() (p->lex.lpar_beg == p->lex.paren_nest)

static enum yytokentype yylex(YYSTYPE*, YYLTYPE*, struct parser_params*);

#ifndef RIPPER
static inline void
rb_discard_node(struct parser_params *p, NODE *n)
{
    rb_ast_delete_node(p->ast, n);
}
#endif

#ifdef RIPPER
static inline VALUE
add_mark_object(struct parser_params *p, VALUE obj)
{
    if (!SPECIAL_CONST_P(obj)
	&& !RB_TYPE_P(obj, T_NODE) /* Ripper jumbles NODE objects and other objects... */
    ) {
	rb_ast_add_mark_object(p->ast, obj);
    }
    return obj;
}
#else
static NODE* node_newnode_with_locals(struct parser_params *, enum node_type, VALUE, VALUE, const rb_code_location_t*);
#endif

static NODE* node_newnode(struct parser_params *, enum node_type, VALUE, VALUE, VALUE, const rb_code_location_t*);
#define rb_node_newnode(type, a1, a2, a3, loc) node_newnode(p, (type), (a1), (a2), (a3), (loc))

static NODE *nd_set_loc(NODE *nd, const YYLTYPE *loc);

static int
parser_get_node_id(struct parser_params *p)
{
    int node_id = p->node_id;
    p->node_id++;
    return node_id;
}

#ifndef RIPPER
static inline void
set_line_body(NODE *body, int line)
{
    if (!body) return;
    switch (nd_type(body)) {
      case NODE_RESCUE:
      case NODE_ENSURE:
	nd_set_line(body, line);
    }
}

#define yyparse ruby_yyparse

static NODE* cond(struct parser_params *p, NODE *node, const YYLTYPE *loc);
static NODE* method_cond(struct parser_params *p, NODE *node, const YYLTYPE *loc);
#define new_nil(loc) NEW_NIL(loc)
static NODE *new_nil_at(struct parser_params *p, const rb_code_position_t *pos);
static NODE *new_if(struct parser_params*,NODE*,NODE*,NODE*,const YYLTYPE*);
static NODE *new_unless(struct parser_params*,NODE*,NODE*,NODE*,const YYLTYPE*);
static NODE *logop(struct parser_params*,ID,NODE*,NODE*,const YYLTYPE*,const YYLTYPE*);

static NODE *newline_node(NODE*);
static void fixpos(NODE*,NODE*);

static int value_expr_gen(struct parser_params*,NODE*);
static void void_expr(struct parser_params*,NODE*);
static NODE *remove_begin(NODE*);
static NODE *remove_begin_all(NODE*);
#define value_expr(node) value_expr_gen(p, (node) = remove_begin(node))
static NODE *void_stmts(struct parser_params*,NODE*);
static void reduce_nodes(struct parser_params*,NODE**);
static void block_dup_check(struct parser_params*,NODE*,NODE*);

static NODE *block_append(struct parser_params*,NODE*,NODE*);
static NODE *list_append(struct parser_params*,NODE*,NODE*);
static NODE *list_concat(NODE*,NODE*);
static NODE *arg_append(struct parser_params*,NODE*,NODE*,const YYLTYPE*);
static NODE *last_arg_append(struct parser_params *p, NODE *args, NODE *last_arg, const YYLTYPE *loc);
static NODE *rest_arg_append(struct parser_params *p, NODE *args, NODE *rest_arg, const YYLTYPE *loc);
static NODE *literal_concat(struct parser_params*,NODE*,NODE*,const YYLTYPE*);
static NODE *new_evstr(struct parser_params*,NODE*,const YYLTYPE*);
static NODE *new_dstr(struct parser_params*,NODE*,const YYLTYPE*);
static NODE *evstr2dstr(struct parser_params*,NODE*);
static NODE *splat_array(NODE*);
static void mark_lvar_used(struct parser_params *p, NODE *rhs);

static NODE *call_bin_op(struct parser_params*,NODE*,ID,NODE*,const YYLTYPE*,const YYLTYPE*);
static NODE *call_uni_op(struct parser_params*,NODE*,ID,const YYLTYPE*,const YYLTYPE*);
static NODE *new_qcall(struct parser_params* p, ID atype, NODE *recv, ID mid, NODE *args, const YYLTYPE *op_loc, const YYLTYPE *loc);
static NODE *new_command_qcall(struct parser_params* p, ID atype, NODE *recv, ID mid, NODE *args, NODE *block, const YYLTYPE *op_loc, const YYLTYPE *loc);
static NODE *method_add_block(struct parser_params*p, NODE *m, NODE *b, const YYLTYPE *loc) {b->nd_iter = m; b->nd_loc = *loc; return b;}

static bool args_info_empty_p(struct rb_args_info *args);
static NODE *new_args(struct parser_params*,NODE*,NODE*,ID,NODE*,NODE*,const YYLTYPE*);
static NODE *new_args_tail(struct parser_params*,NODE*,ID,ID,const YYLTYPE*);
static NODE *new_array_pattern(struct parser_params *p, NODE *constant, NODE *pre_arg, NODE *aryptn, const YYLTYPE *loc);
static NODE *new_array_pattern_tail(struct parser_params *p, NODE *pre_args, int has_rest, ID rest_arg, NODE *post_args, const YYLTYPE *loc);
static NODE *new_find_pattern(struct parser_params *p, NODE *constant, NODE *fndptn, const YYLTYPE *loc);
static NODE *new_find_pattern_tail(struct parser_params *p, ID pre_rest_arg, NODE *args, ID post_rest_arg, const YYLTYPE *loc);
static NODE *new_hash_pattern(struct parser_params *p, NODE *constant, NODE *hshptn, const YYLTYPE *loc);
static NODE *new_hash_pattern_tail(struct parser_params *p, NODE *kw_args, ID kw_rest_arg, const YYLTYPE *loc);
static void warn_one_line_pattern_matching(struct parser_params *p, NODE *node, NODE *pattern, bool right_assign);

static NODE *new_kw_arg(struct parser_params *p, NODE *k, const YYLTYPE *loc);
static NODE *args_with_numbered(struct parser_params*,NODE*,int);

static VALUE negate_lit(struct parser_params*, VALUE);
static NODE *ret_args(struct parser_params*,NODE*);
static NODE *arg_blk_pass(NODE*,NODE*);
static NODE *new_yield(struct parser_params*,NODE*,const YYLTYPE*);
static NODE *dsym_node(struct parser_params*,NODE*,const YYLTYPE*);

static NODE *gettable(struct parser_params*,ID,const YYLTYPE*);
static NODE *assignable(struct parser_params*,ID,NODE*,const YYLTYPE*);

static NODE *aryset(struct parser_params*,NODE*,NODE*,const YYLTYPE*);
static NODE *attrset(struct parser_params*,NODE*,ID,ID,const YYLTYPE*);

static void rb_backref_error(struct parser_params*,NODE*);
static NODE *node_assign(struct parser_params*,NODE*,NODE*,struct lex_context,const YYLTYPE*);

static NODE *new_op_assign(struct parser_params *p, NODE *lhs, ID op, NODE *rhs, struct lex_context, const YYLTYPE *loc);
static NODE *new_ary_op_assign(struct parser_params *p, NODE *ary, NODE *args, ID op, NODE *rhs, const YYLTYPE *args_loc, const YYLTYPE *loc);
static NODE *new_attr_op_assign(struct parser_params *p, NODE *lhs, ID atype, ID attr, ID op, NODE *rhs, const YYLTYPE *loc);
static NODE *new_const_op_assign(struct parser_params *p, NODE *lhs, ID op, NODE *rhs, struct lex_context, const YYLTYPE *loc);
static NODE *new_bodystmt(struct parser_params *p, NODE *head, NODE *rescue, NODE *rescue_else, NODE *ensure, const YYLTYPE *loc);

static NODE *const_decl(struct parser_params *p, NODE* path, const YYLTYPE *loc);

static NODE *opt_arg_append(NODE*, NODE*);
static NODE *kwd_append(NODE*, NODE*);

static NODE *new_hash(struct parser_params *p, NODE *hash, const YYLTYPE *loc);
static NODE *new_unique_key_hash(struct parser_params *p, NODE *hash, const YYLTYPE *loc);

static NODE *new_defined(struct parser_params *p, NODE *expr, const YYLTYPE *loc);

static NODE *new_regexp(struct parser_params *, NODE *, int, const YYLTYPE *);

#define make_list(list, loc) ((list) ? (nd_set_loc(list, loc), list) : NEW_ZLIST(loc))

static NODE *new_xstring(struct parser_params *, NODE *, const YYLTYPE *loc);

static NODE *symbol_append(struct parser_params *p, NODE *symbols, NODE *symbol);

static NODE *match_op(struct parser_params*,NODE*,NODE*,const YYLTYPE*,const YYLTYPE*);

static ID  *local_tbl(struct parser_params*);

static VALUE reg_compile(struct parser_params*, VALUE, int);
static void reg_fragment_setenc(struct parser_params*, VALUE, int);
static int reg_fragment_check(struct parser_params*, VALUE, int);
static NODE *reg_named_capture_assign(struct parser_params* p, VALUE regexp, const YYLTYPE *loc);

static int literal_concat0(struct parser_params *p, VALUE head, VALUE tail);
static NODE *heredoc_dedent(struct parser_params*,NODE*);

static void check_literal_when(struct parser_params *p, NODE *args, const YYLTYPE *loc);

#define get_id(id) (id)
#define get_value(val) (val)
#define get_num(num) (num)
#else  /* RIPPER */
#define NODE_RIPPER NODE_CDECL
#define NEW_RIPPER(a,b,c,loc) (VALUE)NEW_CDECL(a,b,c,loc)

static inline int ripper_is_node_yylval(VALUE n);

static inline VALUE
ripper_new_yylval(struct parser_params *p, ID a, VALUE b, VALUE c)
{
    if (ripper_is_node_yylval(c)) c = RNODE(c)->nd_cval;
    add_mark_object(p, b);
    add_mark_object(p, c);
    return NEW_RIPPER(a, b, c, &NULL_LOC);
}

static inline int
ripper_is_node_yylval(VALUE n)
{
    return RB_TYPE_P(n, T_NODE) && nd_type(RNODE(n)) == NODE_RIPPER;
}

#define value_expr(node) ((void)(node))
#define remove_begin(node) (node)
#define void_stmts(p,x) (x)
#define rb_dvar_defined(id, base) 0
#define rb_local_defined(id, base) 0
static ID ripper_get_id(VALUE);
#define get_id(id) ripper_get_id(id)
static VALUE ripper_get_value(VALUE);
#define get_value(val) ripper_get_value(val)
#define get_num(num) (int)get_id(num)
static VALUE assignable(struct parser_params*,VALUE);
static int id_is_var(struct parser_params *p, ID id);

#define method_cond(p,node,loc) (node)
#define call_bin_op(p, recv,id,arg1,op_loc,loc) dispatch3(binary, (recv), STATIC_ID2SYM(id), (arg1))
#define match_op(p,node1,node2,op_loc,loc) call_bin_op(0, (node1), idEqTilde, (node2), op_loc, loc)
#define call_uni_op(p, recv,id,op_loc,loc) dispatch2(unary, STATIC_ID2SYM(id), (recv))
#define logop(p,id,node1,node2,op_loc,loc) call_bin_op(0, (node1), (id), (node2), op_loc, loc)

#define new_nil(loc) Qnil

static VALUE new_regexp(struct parser_params *, VALUE, VALUE, const YYLTYPE *);

static VALUE const_decl(struct parser_params *p, VALUE path);

static VALUE var_field(struct parser_params *p, VALUE a);
static VALUE assign_error(struct parser_params *p, const char *mesg, VALUE a);

static VALUE parser_reg_compile(struct parser_params*, VALUE, int, VALUE *);

static VALUE backref_error(struct parser_params*, NODE *, VALUE);
#endif /* !RIPPER */

/* forward declaration */
typedef struct rb_strterm_heredoc_struct rb_strterm_heredoc_t;

RUBY_SYMBOL_EXPORT_BEGIN
VALUE rb_parser_reg_compile(struct parser_params* p, VALUE str, int options);
int rb_reg_fragment_setenc(struct parser_params*, VALUE, int);
enum lex_state_e rb_parser_trace_lex_state(struct parser_params *, enum lex_state_e, enum lex_state_e, int);
VALUE rb_parser_lex_state_name(enum lex_state_e state);
void rb_parser_show_bitstack(struct parser_params *, stack_type, const char *, int);
PRINTF_ARGS(void rb_parser_fatal(struct parser_params *p, const char *fmt, ...), 2, 3);
YYLTYPE *rb_parser_set_location_from_strterm_heredoc(struct parser_params *p, rb_strterm_heredoc_t *here, YYLTYPE *yylloc);
YYLTYPE *rb_parser_set_location_of_none(struct parser_params *p, YYLTYPE *yylloc);
YYLTYPE *rb_parser_set_location(struct parser_params *p, YYLTYPE *yylloc);
RUBY_SYMBOL_EXPORT_END

static void error_duplicate_pattern_variable(struct parser_params *p, ID id, const YYLTYPE *loc);
static void error_duplicate_pattern_key(struct parser_params *p, ID id, const YYLTYPE *loc);
static void parser_token_value_print(struct parser_params *p, enum yytokentype type, const YYSTYPE *valp);
static ID formal_argument(struct parser_params*, ID);
static ID shadowing_lvar(struct parser_params*,ID);
static void new_bv(struct parser_params*,ID);

static void local_push(struct parser_params*,int);
static void local_pop(struct parser_params*);
static void local_var(struct parser_params*, ID);
static void arg_var(struct parser_params*, ID);
static int  local_id(struct parser_params *p, ID id);
static int  local_id_ref(struct parser_params*, ID, ID **);
#ifndef RIPPER
static ID   internal_id(struct parser_params*);
static NODE *new_args_forward_call(struct parser_params*, NODE*, const YYLTYPE*, const YYLTYPE*);
static NODE *new_args_forward_def(struct parser_params*, NODE*, const YYLTYPE*);
#endif
static int check_forwarding_args(struct parser_params*);
static void add_forwarding_args(struct parser_params *p);

static const struct vtable *dyna_push(struct parser_params *);
static void dyna_pop(struct parser_params*, const struct vtable *);
static int dyna_in_block(struct parser_params*);
#define dyna_var(p, id) local_var(p, id)
static int dvar_defined(struct parser_params*, ID);
static int dvar_defined_ref(struct parser_params*, ID, ID**);
static int dvar_curr(struct parser_params*,ID);

static int lvar_defined(struct parser_params*, ID);

static NODE *numparam_push(struct parser_params *p);
static void numparam_pop(struct parser_params *p, NODE *prev_inner);

#ifdef RIPPER
# define METHOD_NOT idNOT
#else
# define METHOD_NOT '!'
#endif

#define idFWD_REST   '*'
#ifdef RUBY3_KEYWORDS
#define idFWD_KWREST idPow /* Use simple "**", as tDSTAR is "**arg" */
#else
#define idFWD_KWREST 0
#endif
#define idFWD_BLOCK  '&'

#define RE_OPTION_ONCE (1<<16)
#define RE_OPTION_ENCODING_SHIFT 8
#define RE_OPTION_ENCODING(e) (((e)&0xff)<<RE_OPTION_ENCODING_SHIFT)
#define RE_OPTION_ENCODING_IDX(o) (((o)>>RE_OPTION_ENCODING_SHIFT)&0xff)
#define RE_OPTION_ENCODING_NONE(o) ((o)&RE_OPTION_ARG_ENCODING_NONE)
#define RE_OPTION_MASK  0xff
#define RE_OPTION_ARG_ENCODING_NONE 32

/* structs for managing terminator of string literal and heredocment */
typedef struct rb_strterm_literal_struct {
    union {
	VALUE dummy;
	long nest;
    } u0;
    union {
	VALUE dummy;
	long func;	    /* STR_FUNC_* (e.g., STR_FUNC_ESCAPE and STR_FUNC_EXPAND) */
    } u1;
    union {
	VALUE dummy;
	long paren;	    /* '(' of `%q(...)` */
    } u2;
    union {
	VALUE dummy;
	long term;	    /* ')' of `%q(...)` */
    } u3;
} rb_strterm_literal_t;

#define HERETERM_LENGTH_BITS ((SIZEOF_VALUE - 1) * CHAR_BIT - 1)

struct rb_strterm_heredoc_struct {
    VALUE lastline;	/* the string of line that contains `<<"END"` */
    long offset;	/* the column of END in `<<"END"` */
    int sourceline;	/* lineno of the line that contains `<<"END"` */
    unsigned length	/* the length of END in `<<"END"` */
#if HERETERM_LENGTH_BITS < SIZEOF_INT * CHAR_BIT
    : HERETERM_LENGTH_BITS
# define HERETERM_LENGTH_MAX ((1U << HERETERM_LENGTH_BITS) - 1)
#else
# define HERETERM_LENGTH_MAX UINT_MAX
#endif
    ;
#if HERETERM_LENGTH_BITS < SIZEOF_INT * CHAR_BIT
    unsigned quote: 1;
    unsigned func: 8;
#else
    uint8_t quote;
    uint8_t func;
#endif
};
STATIC_ASSERT(rb_strterm_heredoc_t, sizeof(rb_strterm_heredoc_t) <= 4 * SIZEOF_VALUE);

#define STRTERM_HEREDOC IMEMO_FL_USER0

struct rb_strterm_struct {
    VALUE flags;
    union {
	rb_strterm_literal_t literal;
	rb_strterm_heredoc_t heredoc;
    } u;
};

#ifndef RIPPER
void
rb_strterm_mark(VALUE obj)
{
    rb_strterm_t *strterm = (rb_strterm_t*)obj;
    if (RBASIC(obj)->flags & STRTERM_HEREDOC) {
	rb_strterm_heredoc_t *heredoc = &strterm->u.heredoc;
	rb_gc_mark(heredoc->lastline);
    }
}
#endif

#define yytnamerr(yyres, yystr) (YYSIZE_T)rb_yytnamerr(p, yyres, yystr)
size_t rb_yytnamerr(struct parser_params *p, char *yyres, const char *yystr);

#define TOKEN2ID(tok) ( \
    tTOKEN_LOCAL_BEGIN<(tok)&&(tok)<tTOKEN_LOCAL_END ? TOKEN2LOCALID(tok) : \
    tTOKEN_INSTANCE_BEGIN<(tok)&&(tok)<tTOKEN_INSTANCE_END ? TOKEN2INSTANCEID(tok) : \
    tTOKEN_GLOBAL_BEGIN<(tok)&&(tok)<tTOKEN_GLOBAL_END ? TOKEN2GLOBALID(tok) : \
    tTOKEN_CONST_BEGIN<(tok)&&(tok)<tTOKEN_CONST_END ? TOKEN2CONSTID(tok) : \
    tTOKEN_CLASS_BEGIN<(tok)&&(tok)<tTOKEN_CLASS_END ? TOKEN2CLASSID(tok) : \
    tTOKEN_ATTRSET_BEGIN<(tok)&&(tok)<tTOKEN_ATTRSET_END ? TOKEN2ATTRSETID(tok) : \
    ((tok) / ((tok)<tPRESERVED_ID_END && ((tok)>=128 || rb_ispunct(tok)))))

/****** Ripper *******/

#ifdef RIPPER
#define RIPPER_VERSION "0.1.0"

static inline VALUE intern_sym(const char *name);

#include "eventids1.c"
#include "eventids2.c"

static VALUE ripper_dispatch0(struct parser_params*,ID);
static VALUE ripper_dispatch1(struct parser_params*,ID,VALUE);
static VALUE ripper_dispatch2(struct parser_params*,ID,VALUE,VALUE);
static VALUE ripper_dispatch3(struct parser_params*,ID,VALUE,VALUE,VALUE);
static VALUE ripper_dispatch4(struct parser_params*,ID,VALUE,VALUE,VALUE,VALUE);
static VALUE ripper_dispatch5(struct parser_params*,ID,VALUE,VALUE,VALUE,VALUE,VALUE);
static VALUE ripper_dispatch7(struct parser_params*,ID,VALUE,VALUE,VALUE,VALUE,VALUE,VALUE,VALUE);
static void ripper_error(struct parser_params *p);

#define dispatch0(n)            ripper_dispatch0(p, TOKEN_PASTE(ripper_id_, n))
#define dispatch1(n,a)          ripper_dispatch1(p, TOKEN_PASTE(ripper_id_, n), (a))
#define dispatch2(n,a,b)        ripper_dispatch2(p, TOKEN_PASTE(ripper_id_, n), (a), (b))
#define dispatch3(n,a,b,c)      ripper_dispatch3(p, TOKEN_PASTE(ripper_id_, n), (a), (b), (c))
#define dispatch4(n,a,b,c,d)    ripper_dispatch4(p, TOKEN_PASTE(ripper_id_, n), (a), (b), (c), (d))
#define dispatch5(n,a,b,c,d,e)  ripper_dispatch5(p, TOKEN_PASTE(ripper_id_, n), (a), (b), (c), (d), (e))
#define dispatch7(n,a,b,c,d,e,f,g) ripper_dispatch7(p, TOKEN_PASTE(ripper_id_, n), (a), (b), (c), (d), (e), (f), (g))

#define yyparse ripper_yyparse

#define ID2VAL(id) STATIC_ID2SYM(id)
#define TOKEN2VAL(t) ID2VAL(TOKEN2ID(t))
#define KWD2EID(t, v) ripper_new_yylval(p, keyword_##t, get_value(v), 0)

#define params_new(pars, opts, rest, pars2, kws, kwrest, blk) \
        dispatch7(params, (pars), (opts), (rest), (pars2), (kws), (kwrest), (blk))

#define escape_Qundef(x) ((x)==Qundef ? Qnil : (x))

static inline VALUE
new_args(struct parser_params *p, VALUE pre_args, VALUE opt_args, VALUE rest_arg, VALUE post_args, VALUE tail, YYLTYPE *loc)
{
    NODE *t = (NODE *)tail;
    VALUE kw_args = t->u1.value, kw_rest_arg = t->u2.value, block = t->u3.value;
    return params_new(pre_args, opt_args, rest_arg, post_args, kw_args, kw_rest_arg, escape_Qundef(block));
}

static inline VALUE
new_args_tail(struct parser_params *p, VALUE kw_args, VALUE kw_rest_arg, VALUE block, YYLTYPE *loc)
{
    NODE *t = rb_node_newnode(NODE_ARGS_AUX, kw_args, kw_rest_arg, block, &NULL_LOC);
    add_mark_object(p, kw_args);
    add_mark_object(p, kw_rest_arg);
    add_mark_object(p, block);
    return (VALUE)t;
}

static inline VALUE
args_with_numbered(struct parser_params *p, VALUE args, int max_numparam)
{
    return args;
}

static VALUE
new_array_pattern(struct parser_params *p, VALUE constant, VALUE pre_arg, VALUE aryptn, const YYLTYPE *loc)
{
    NODE *t = (NODE *)aryptn;
    VALUE pre_args = t->u1.value, rest_arg = t->u2.value, post_args = t->u3.value;

    if (!NIL_P(pre_arg)) {
	if (!NIL_P(pre_args)) {
	    rb_ary_unshift(pre_args, pre_arg);
	}
	else {
	    pre_args = rb_ary_new_from_args(1, pre_arg);
	}
    }
    return dispatch4(aryptn, constant, pre_args, rest_arg, post_args);
}

static VALUE
new_array_pattern_tail(struct parser_params *p, VALUE pre_args, VALUE has_rest, VALUE rest_arg, VALUE post_args, const YYLTYPE *loc)
{
    NODE *t;

    if (has_rest) {
	rest_arg = dispatch1(var_field, rest_arg ? rest_arg : Qnil);
    }
    else {
	rest_arg = Qnil;
    }

    t = rb_node_newnode(NODE_ARYPTN, pre_args, rest_arg, post_args, &NULL_LOC);
    add_mark_object(p, pre_args);
    add_mark_object(p, rest_arg);
    add_mark_object(p, post_args);
    return (VALUE)t;
}

static VALUE
new_find_pattern(struct parser_params *p, VALUE constant, VALUE fndptn, const YYLTYPE *loc)
{
    NODE *t = (NODE *)fndptn;
    VALUE pre_rest_arg = t->u1.value, args = t->u2.value, post_rest_arg = t->u3.value;

    return dispatch4(fndptn, constant, pre_rest_arg, args, post_rest_arg);
}

static VALUE
new_find_pattern_tail(struct parser_params *p, VALUE pre_rest_arg, VALUE args, VALUE post_rest_arg, const YYLTYPE *loc)
{
    NODE *t;

    pre_rest_arg = dispatch1(var_field, pre_rest_arg ? pre_rest_arg : Qnil);
    post_rest_arg = dispatch1(var_field, post_rest_arg ? post_rest_arg : Qnil);

    t = rb_node_newnode(NODE_FNDPTN, pre_rest_arg, args, post_rest_arg, &NULL_LOC);
    add_mark_object(p, pre_rest_arg);
    add_mark_object(p, args);
    add_mark_object(p, post_rest_arg);
    return (VALUE)t;
}

#define new_hash(p,h,l) rb_ary_new_from_args(0)

static VALUE
new_unique_key_hash(struct parser_params *p, VALUE ary, const YYLTYPE *loc)
{
    return ary;
}

static VALUE
new_hash_pattern(struct parser_params *p, VALUE constant, VALUE hshptn, const YYLTYPE *loc)
{
    NODE *t = (NODE *)hshptn;
    VALUE kw_args = t->u1.value, kw_rest_arg = t->u2.value;
    return dispatch3(hshptn, constant, kw_args, kw_rest_arg);
}

static VALUE
new_hash_pattern_tail(struct parser_params *p, VALUE kw_args, VALUE kw_rest_arg, const YYLTYPE *loc)
{
    NODE *t;
    if (kw_rest_arg) {
	kw_rest_arg = dispatch1(var_field, kw_rest_arg);
    }
    else {
	kw_rest_arg = Qnil;
    }
    t = rb_node_newnode(NODE_HSHPTN, kw_args, kw_rest_arg, 0, &NULL_LOC);

    add_mark_object(p, kw_args);
    add_mark_object(p, kw_rest_arg);
    return (VALUE)t;
}

#define new_defined(p,expr,loc) dispatch1(defined, (expr))

static VALUE heredoc_dedent(struct parser_params*,VALUE);

#else
#define ID2VAL(id) (id)
#define TOKEN2VAL(t) ID2VAL(t)
#define KWD2EID(t, v) keyword_##t

static NODE *
set_defun_body(struct parser_params *p, NODE *n, NODE *args, NODE *body, const YYLTYPE *loc)
{
    body = remove_begin(body);
    reduce_nodes(p, &body);
    n->nd_defn = NEW_SCOPE(args, body, loc);
    n->nd_loc = *loc;
    nd_set_line(n->nd_defn, loc->end_pos.lineno);
    set_line_body(body, loc->beg_pos.lineno);
    return n;
}

static NODE *
rescued_expr(struct parser_params *p, NODE *arg, NODE *rescue,
	     const YYLTYPE *arg_loc, const YYLTYPE *mod_loc, const YYLTYPE *res_loc)
{
    YYLTYPE loc = code_loc_gen(mod_loc, res_loc);
    rescue = NEW_RESBODY(0, remove_begin(rescue), 0, &loc);
    loc.beg_pos = arg_loc->beg_pos;
    return NEW_RESCUE(arg, rescue, 0, &loc);
}

#endif /* RIPPER */

static void
restore_defun(struct parser_params *p, NODE *name)
{
    YYSTYPE c = {.val = name->nd_cval};
    p->cur_arg = name->nd_vid;
    p->ctxt.in_def = c.ctxt.in_def;
    p->ctxt.shareable_constant_value = c.ctxt.shareable_constant_value;
}

static void
endless_method_name(struct parser_params *p, NODE *defn, const YYLTYPE *loc)
{
#ifdef RIPPER
    defn = defn->nd_defn;
#endif
    ID mid = defn->nd_mid;
    if (is_attrset_id(mid)) {
	yyerror1(loc, "setter method cannot be defined in an endless method definition");
    }
    token_info_drop(p, "def", loc->beg_pos);
}

#ifndef RIPPER
# define Qnone 0
# define Qnull 0
# define ifndef_ripper(x) (x)
#else
# define Qnone Qnil
# define Qnull Qundef
# define ifndef_ripper(x)
#endif

# define rb_warn0(fmt)         WARN_CALL(WARN_ARGS(fmt, 1))
# define rb_warn1(fmt,a)       WARN_CALL(WARN_ARGS(fmt, 2), (a))
# define rb_warn2(fmt,a,b)     WARN_CALL(WARN_ARGS(fmt, 3), (a), (b))
# define rb_warn3(fmt,a,b,c)   WARN_CALL(WARN_ARGS(fmt, 4), (a), (b), (c))
# define rb_warn4(fmt,a,b,c,d) WARN_CALL(WARN_ARGS(fmt, 5), (a), (b), (c), (d))
# define rb_warning0(fmt)         WARNING_CALL(WARNING_ARGS(fmt, 1))
# define rb_warning1(fmt,a)       WARNING_CALL(WARNING_ARGS(fmt, 2), (a))
# define rb_warning2(fmt,a,b)     WARNING_CALL(WARNING_ARGS(fmt, 3), (a), (b))
# define rb_warning3(fmt,a,b,c)   WARNING_CALL(WARNING_ARGS(fmt, 4), (a), (b), (c))
# define rb_warning4(fmt,a,b,c,d) WARNING_CALL(WARNING_ARGS(fmt, 5), (a), (b), (c), (d))
# define rb_warn0L(l,fmt)         WARN_CALL(WARN_ARGS_L(l, fmt, 1))
# define rb_warn1L(l,fmt,a)       WARN_CALL(WARN_ARGS_L(l, fmt, 2), (a))
# define rb_warn2L(l,fmt,a,b)     WARN_CALL(WARN_ARGS_L(l, fmt, 3), (a), (b))
# define rb_warn3L(l,fmt,a,b,c)   WARN_CALL(WARN_ARGS_L(l, fmt, 4), (a), (b), (c))
# define rb_warn4L(l,fmt,a,b,c,d) WARN_CALL(WARN_ARGS_L(l, fmt, 5), (a), (b), (c), (d))
# define rb_warning0L(l,fmt)         WARNING_CALL(WARNING_ARGS_L(l, fmt, 1))
# define rb_warning1L(l,fmt,a)       WARNING_CALL(WARNING_ARGS_L(l, fmt, 2), (a))
# define rb_warning2L(l,fmt,a,b)     WARNING_CALL(WARNING_ARGS_L(l, fmt, 3), (a), (b))
# define rb_warning3L(l,fmt,a,b,c)   WARNING_CALL(WARNING_ARGS_L(l, fmt, 4), (a), (b), (c))
# define rb_warning4L(l,fmt,a,b,c,d) WARNING_CALL(WARNING_ARGS_L(l, fmt, 5), (a), (b), (c), (d))
#ifdef RIPPER
static ID id_warn, id_warning, id_gets, id_assoc;
# define ERR_MESG() STR_NEW2(mesg) /* to bypass Ripper DSL */
# define WARN_S_L(s,l) STR_NEW(s,l)
# define WARN_S(s) STR_NEW2(s)
# define WARN_I(i) INT2NUM(i)
# define WARN_ID(i) rb_id2str(i)
# define WARN_IVAL(i) i
# define PRIsWARN "s"
# define WARN_ARGS(fmt,n) p->value, id_warn, n, rb_usascii_str_new_lit(fmt)
# define WARN_ARGS_L(l,fmt,n) WARN_ARGS(fmt,n)
# ifdef HAVE_VA_ARGS_MACRO
# define WARN_CALL(...) rb_funcall(__VA_ARGS__)
# else
# define WARN_CALL rb_funcall
# endif
# define WARNING_ARGS(fmt,n) p->value, id_warning, n, rb_usascii_str_new_lit(fmt)
# define WARNING_ARGS_L(l, fmt,n) WARNING_ARGS(fmt,n)
# ifdef HAVE_VA_ARGS_MACRO
# define WARNING_CALL(...) rb_funcall(__VA_ARGS__)
# else
# define WARNING_CALL rb_funcall
# endif
PRINTF_ARGS(static void ripper_compile_error(struct parser_params*, const char *fmt, ...), 2, 3);
# define compile_error ripper_compile_error
#else
# define WARN_S_L(s,l) s
# define WARN_S(s) s
# define WARN_I(i) i
# define WARN_ID(i) rb_id2name(i)
# define WARN_IVAL(i) NUM2INT(i)
# define PRIsWARN PRIsVALUE
# define WARN_ARGS(fmt,n) WARN_ARGS_L(p->ruby_sourceline,fmt,n)
# define WARN_ARGS_L(l,fmt,n) p->ruby_sourcefile, (l), (fmt)
# define WARN_CALL rb_compile_warn
# define WARNING_ARGS(fmt,n) WARN_ARGS(fmt,n)
# define WARNING_ARGS_L(l,fmt,n) WARN_ARGS_L(l,fmt,n)
# define WARNING_CALL rb_compile_warning
PRINTF_ARGS(static void parser_compile_error(struct parser_params*, const char *fmt, ...), 2, 3);
# define compile_error parser_compile_error
#endif

#define WARN_EOL(tok) \
    (looking_at_eol_p(p) ? \
     (void)rb_warning0("`" tok "' at the end of line without an expression") : \
     (void)0)
static int looking_at_eol_p(struct parser_params *p);
%}

%expect 0
%define api.pure
%define parse.error verbose
%lex-param {struct parser_params *p}
%parse-param {struct parser_params *p}
%initial-action
{
    RUBY_SET_YYLLOC_OF_NONE(@$);
};

%union {
    VALUE val;
    NODE *node;
    ID id;
    int num;
    st_table *tbl;
    const struct vtable *vars;
    struct rb_strterm_struct *strterm;
    struct lex_context ctxt;
}

%token <id>
        keyword_class        "`class'"
        keyword_module       "`module'"
        keyword_def          "`def'"
        keyword_undef        "`undef'"
        keyword_begin        "`begin'"
        keyword_rescue       "`rescue'"
        keyword_ensure       "`ensure'"
        keyword_end          "`end'"
        keyword_if           "`if'"
        keyword_unless       "`unless'"
        keyword_then         "`then'"
        keyword_elsif        "`elsif'"
        keyword_else         "`else'"
        keyword_case         "`case'"
        keyword_when         "`when'"
        keyword_while        "`while'"
        keyword_until        "`until'"
        keyword_for          "`for'"
        keyword_break        "`break'"
        keyword_next         "`next'"
        keyword_redo         "`redo'"
        keyword_retry        "`retry'"
        keyword_in           "`in'"
        keyword_do           "`do'"
        keyword_do_cond      "`do' for condition"
        keyword_do_block     "`do' for block"
        keyword_do_LAMBDA    "`do' for lambda"
        keyword_return       "`return'"
        keyword_yield        "`yield'"
        keyword_super        "`super'"
        keyword_self         "`self'"
        keyword_nil          "`nil'"
        keyword_true         "`true'"
        keyword_false        "`false'"
        keyword_and          "`and'"
        keyword_or           "`or'"
        keyword_not          "`not'"
        modifier_if          "`if' modifier"
        modifier_unless      "`unless' modifier"
        modifier_while       "`while' modifier"
        modifier_until       "`until' modifier"
        modifier_rescue      "`rescue' modifier"
        keyword_alias        "`alias'"
        keyword_defined      "`defined?'"
        keyword_BEGIN        "`BEGIN'"
        keyword_END          "`END'"
        keyword__LINE__      "`__LINE__'"
        keyword__FILE__      "`__FILE__'"
        keyword__ENCODING__  "`__ENCODING__'"

%token <id>   tIDENTIFIER    "local variable or method"
%token <id>   tFID           "method"
%token <id>   tGVAR          "global variable"
%token <id>   tIVAR          "instance variable"
%token <id>   tCONSTANT      "constant"
%token <id>   tCVAR          "class variable"
%token <id>   tLABEL         "label"
%token <node> tINTEGER       "integer literal"
%token <node> tFLOAT         "float literal"
%token <node> tRATIONAL      "rational literal"
%token <node> tIMAGINARY     "imaginary literal"
%token <node> tCHAR          "char literal"
%token <node> tNTH_REF       "numbered reference"
%token <node> tBACK_REF      "back reference"
%token <node> tSTRING_CONTENT "literal content"
%token <num>  tREGEXP_END

%type <node> singleton strings string string1 xstring regexp
%type <node> string_contents xstring_contents regexp_contents string_content
%type <node> words symbols symbol_list qwords qsymbols word_list qword_list qsym_list word
%type <node> literal numeric simple_numeric ssym dsym symbol cpath def_name defn_head defs_head
%type <node> top_compstmt top_stmts top_stmt begin_block
%type <node> bodystmt compstmt stmts stmt_or_begin stmt expr arg primary command command_call method_call
%type <node> expr_value expr_value_do arg_value primary_value fcall rel_expr
%type <node> if_tail opt_else case_body case_args cases opt_rescue exc_list exc_var opt_ensure
%type <node> args call_args opt_call_args
%type <node> paren_args opt_paren_args args_tail opt_args_tail block_args_tail opt_block_args_tail
%type <node> command_args aref_args opt_block_arg block_arg var_ref var_lhs
%type <node> command_rhs arg_rhs
%type <node> command_asgn mrhs mrhs_arg superclass block_call block_command
%type <node> f_block_optarg f_block_opt
%type <node> f_arglist f_opt_paren_args f_paren_args f_args f_arg f_arg_item
%type <node> f_optarg f_marg f_marg_list f_margs f_rest_marg
%type <node> assoc_list assocs assoc undef_list backref string_dvar for_var
%type <node> block_param opt_block_param block_param_def f_opt
%type <node> f_kwarg f_kw f_block_kwarg f_block_kw
%type <node> bv_decls opt_bv_decl bvar
%type <node> lambda f_larglist lambda_body brace_body do_body
%type <node> brace_block cmd_brace_block do_block lhs none fitem
%type <node> mlhs mlhs_head mlhs_basic mlhs_item mlhs_node mlhs_post mlhs_inner
%type <node> p_case_body p_cases p_top_expr p_top_expr_body
%type <node> p_expr p_as p_alt p_expr_basic p_find
%type <node> p_args p_args_head p_args_tail p_args_post p_arg
%type <node> p_value p_primitive p_variable p_var_ref p_const
%type <node> p_kwargs p_kwarg p_kw
%type <id>   keyword_variable user_variable sym operation operation2 operation3
%type <id>   cname fname op f_rest_arg f_block_arg opt_f_block_arg f_norm_arg f_bad_arg
%type <id>   f_kwrest f_label f_arg_asgn call_op call_op2 reswords relop dot_or_colon
%type <id>   p_rest p_kwrest p_kwnorest p_any_kwrest p_kw_label
%type <id>   f_no_kwarg f_any_kwrest args_forward excessed_comma
 %type <ctxt> lex_ctxt /* keep <ctxt> in ripper */
%token END_OF_INPUT 0	"end-of-input"
%token <id> '.'
/* escaped chars, should be ignored otherwise */
%token <id> '\\'	"backslash"
%token tSP		"escaped space"
%token <id> '\t' 	"escaped horizontal tab"
%token <id> '\f'	"escaped form feed"
%token <id> '\r'	"escaped carriage return"
%token <id> '\13'	"escaped vertical tab"
%token tUPLUS		RUBY_TOKEN(UPLUS)  "unary+"
%token tUMINUS		RUBY_TOKEN(UMINUS) "unary-"
%token tPOW		RUBY_TOKEN(POW)    "**"
%token tCMP		RUBY_TOKEN(CMP)    "<=>"
%token tEQ		RUBY_TOKEN(EQ)     "=="
%token tEQQ		RUBY_TOKEN(EQQ)    "==="
%token tNEQ		RUBY_TOKEN(NEQ)    "!="
%token tGEQ		RUBY_TOKEN(GEQ)    ">="
%token tLEQ		RUBY_TOKEN(LEQ)    "<="
%token tANDOP		RUBY_TOKEN(ANDOP)  "&&"
%token tOROP		RUBY_TOKEN(OROP)   "||"
%token tMATCH		RUBY_TOKEN(MATCH)  "=~"
%token tNMATCH		RUBY_TOKEN(NMATCH) "!~"
%token tDOT2		RUBY_TOKEN(DOT2)   ".."
%token tDOT3		RUBY_TOKEN(DOT3)   "..."
%token tBDOT2		RUBY_TOKEN(BDOT2)   "(.."
%token tBDOT3		RUBY_TOKEN(BDOT3)   "(..."
%token tAREF		RUBY_TOKEN(AREF)   "[]"
%token tASET		RUBY_TOKEN(ASET)   "[]="
%token tLSHFT		RUBY_TOKEN(LSHFT)  "<<"
%token tRSHFT		RUBY_TOKEN(RSHFT)  ">>"
%token <id> tANDDOT	RUBY_TOKEN(ANDDOT) "&."
%token <id> tCOLON2	RUBY_TOKEN(COLON2) "::"
%token tCOLON3		":: at EXPR_BEG"
%token <id> tOP_ASGN	"operator-assignment" /* +=, -=  etc. */
%token tASSOC		"=>"
%token tLPAREN		"("
%token tLPAREN_ARG	"( arg"
%token tRPAREN		")"
%token tLBRACK		"["
%token tLBRACE		"{"
%token tLBRACE_ARG	"{ arg"
%token tSTAR		"*"
%token tDSTAR		"**arg"
%token tAMPER		"&"
%token tLAMBDA		"->"
%token tSYMBEG		"symbol literal"
%token tSTRING_BEG	"string literal"
%token tXSTRING_BEG	"backtick literal"
%token tREGEXP_BEG	"regexp literal"
%token tWORDS_BEG	"word list"
%token tQWORDS_BEG	"verbatim word list"
%token tSYMBOLS_BEG	"symbol list"
%token tQSYMBOLS_BEG	"verbatim symbol list"
%token tSTRING_END	"terminator"
%token tSTRING_DEND	"'}'"
%token tSTRING_DBEG tSTRING_DVAR tLAMBEG tLABEL_END

/*
 *	precedence table
 */

%nonassoc tLOWEST
%nonassoc tLBRACE_ARG

%nonassoc  modifier_if modifier_unless modifier_while modifier_until keyword_in
%left  keyword_or keyword_and
%right keyword_not
%nonassoc keyword_defined
%right '=' tOP_ASGN
%left modifier_rescue
%right '?' ':'
%nonassoc tDOT2 tDOT3 tBDOT2 tBDOT3
%left  tOROP
%left  tANDOP
%nonassoc  tCMP tEQ tEQQ tNEQ tMATCH tNMATCH
%left  '>' tGEQ '<' tLEQ
%left  '|' '^'
%left  '&'
%left  tLSHFT tRSHFT
%left  '+' '-'
%left  '*' '/' '%'
%right tUMINUS_NUM tUMINUS
%right tPOW
%right '!' '~' tUPLUS

%token tLAST_TOKEN

%%
program		:  {
			SET_LEX_STATE(EXPR_BEG);
			local_push(p, ifndef_ripper(1)+0);
		    }
		  top_compstmt
		    {
		    /*%%%*/
			if ($2 && !compile_for_eval) {
			    NODE *node = $2;
			    /* last expression should not be void */
			    if (nd_type(node) == NODE_BLOCK) {
				while (node->nd_next) {
				    node = node->nd_next;
				}
				node = node->nd_head;
			    }
			    node = remove_begin(node);
			    void_expr(p, node);
			}
			p->eval_tree = NEW_SCOPE(0, block_append(p, p->eval_tree, $2), &@$);
		    /*% %*/
		    /*% ripper[final]: program!($2) %*/
			local_pop(p);
		    }
		;

top_compstmt	: top_stmts opt_terms
		    {
			$$ = void_stmts(p, $1);
		    }
		;

top_stmts	: none
                    {
		    /*%%%*/
			$$ = NEW_BEGIN(0, &@$);
		    /*% %*/
		    /*% ripper: stmts_add!(stmts_new!, void_stmt!) %*/
		    }
		| top_stmt
		    {
		    /*%%%*/
			$$ = newline_node($1);
		    /*% %*/
		    /*% ripper: stmts_add!(stmts_new!, $1) %*/
		    }
		| top_stmts terms top_stmt
		    {
		    /*%%%*/
			$$ = block_append(p, $1, newline_node($3));
		    /*% %*/
		    /*% ripper: stmts_add!($1, $3) %*/
		    }
		| error top_stmt
		    {
			$$ = remove_begin($2);
		    }
		;

top_stmt	: stmt
		| keyword_BEGIN begin_block
		    {
			$$ = $2;
		    }
		;

begin_block	: '{' top_compstmt '}'
		    {
		    /*%%%*/
			p->eval_tree_begin = block_append(p, p->eval_tree_begin,
							  NEW_BEGIN($2, &@$));
			$$ = NEW_BEGIN(0, &@$);
		    /*% %*/
		    /*% ripper: BEGIN!($2) %*/
		    }
		;

bodystmt	: compstmt
		  opt_rescue
		  k_else {if (!$2) {yyerror1(&@3, "else without rescue is useless");}}
		  compstmt
		  opt_ensure
		    {
		    /*%%%*/
			$$ = new_bodystmt(p, $1, $2, $5, $6, &@$);
		    /*% %*/
		    /*% ripper: bodystmt!(escape_Qundef($1), escape_Qundef($2), escape_Qundef($5), escape_Qundef($6)) %*/
		    }
		| compstmt
		  opt_rescue
		  opt_ensure
		    {
		    /*%%%*/
			$$ = new_bodystmt(p, $1, $2, 0, $3, &@$);
		    /*% %*/
		    /*% ripper: bodystmt!(escape_Qundef($1), escape_Qundef($2), Qnil, escape_Qundef($3)) %*/
		    }
		;

compstmt	: stmts opt_terms
		    {
			$$ = void_stmts(p, $1);
		    }
		;

stmts		: none
                    {
		    /*%%%*/
			$$ = NEW_BEGIN(0, &@$);
		    /*% %*/
		    /*% ripper: stmts_add!(stmts_new!, void_stmt!) %*/
		    }
		| stmt_or_begin
		    {
		    /*%%%*/
			$$ = newline_node($1);
		    /*% %*/
		    /*% ripper: stmts_add!(stmts_new!, $1) %*/
		    }
		| stmts terms stmt_or_begin
		    {
		    /*%%%*/
			$$ = block_append(p, $1, newline_node($3));
		    /*% %*/
		    /*% ripper: stmts_add!($1, $3) %*/
		    }
		| error stmt
		    {
			$$ = remove_begin($2);
		    }
		;

stmt_or_begin	: stmt
                    {
			$$ = $1;
		    }
                | keyword_BEGIN
		    {
			yyerror1(&@1, "BEGIN is permitted only at toplevel");
		    }
		  begin_block
		    {
			$$ = $3;
		    }
		;

stmt		: keyword_alias fitem {SET_LEX_STATE(EXPR_FNAME|EXPR_FITEM);} fitem
		    {
		    /*%%%*/
			$$ = NEW_ALIAS($2, $4, &@$);
		    /*% %*/
		    /*% ripper: alias!($2, $4) %*/
		    }
		| keyword_alias tGVAR tGVAR
		    {
		    /*%%%*/
			$$ = NEW_VALIAS($2, $3, &@$);
		    /*% %*/
		    /*% ripper: var_alias!($2, $3) %*/
		    }
		| keyword_alias tGVAR tBACK_REF
		    {
		    /*%%%*/
			char buf[2];
			buf[0] = '$';
			buf[1] = (char)$3->nd_nth;
			$$ = NEW_VALIAS($2, rb_intern2(buf, 2), &@$);
		    /*% %*/
		    /*% ripper: var_alias!($2, $3) %*/
		    }
		| keyword_alias tGVAR tNTH_REF
		    {
			static const char mesg[] = "can't make alias for the number variables";
		    /*%%%*/
			yyerror1(&@3, mesg);
			$$ = NEW_BEGIN(0, &@$);
		    /*% %*/
		    /*% ripper[error]: alias_error!(ERR_MESG(), $3) %*/
		    }
		| keyword_undef undef_list
		    {
		    /*%%%*/
			$$ = $2;
		    /*% %*/
		    /*% ripper: undef!($2) %*/
		    }
		| stmt modifier_if expr_value
		    {
		    /*%%%*/
			$$ = new_if(p, $3, remove_begin($1), 0, &@$);
			fixpos($$, $3);
		    /*% %*/
		    /*% ripper: if_mod!($3, $1) %*/
		    }
		| stmt modifier_unless expr_value
		    {
		    /*%%%*/
			$$ = new_unless(p, $3, remove_begin($1), 0, &@$);
			fixpos($$, $3);
		    /*% %*/
		    /*% ripper: unless_mod!($3, $1) %*/
		    }
		| stmt modifier_while expr_value
		    {
		    /*%%%*/
			if ($1 && nd_type($1) == NODE_BEGIN) {
			    $$ = NEW_WHILE(cond(p, $3, &@3), $1->nd_body, 0, &@$);
			}
			else {
			    $$ = NEW_WHILE(cond(p, $3, &@3), $1, 1, &@$);
			}
		    /*% %*/
		    /*% ripper: while_mod!($3, $1) %*/
		    }
		| stmt modifier_until expr_value
		    {
		    /*%%%*/
			if ($1 && nd_type($1) == NODE_BEGIN) {
			    $$ = NEW_UNTIL(cond(p, $3, &@3), $1->nd_body, 0, &@$);
			}
			else {
			    $$ = NEW_UNTIL(cond(p, $3, &@3), $1, 1, &@$);
			}
		    /*% %*/
		    /*% ripper: until_mod!($3, $1) %*/
		    }
		| stmt modifier_rescue stmt
		    {
		    /*%%%*/
			NODE *resq;
			YYLTYPE loc = code_loc_gen(&@2, &@3);
			resq = NEW_RESBODY(0, remove_begin($3), 0, &loc);
			$$ = NEW_RESCUE(remove_begin($1), resq, 0, &@$);
		    /*% %*/
		    /*% ripper: rescue_mod!($1, $3) %*/
		    }
		| keyword_END '{' compstmt '}'
		    {
			if (p->ctxt.in_def) {
			    rb_warn0("END in method; use at_exit");
			}
		    /*%%%*/
			{
			    NODE *scope = NEW_NODE(
				NODE_SCOPE, 0 /* tbl */, $3 /* body */, 0 /* args */, &@$);
			    $$ = NEW_POSTEXE(scope, &@$);
			}
		    /*% %*/
		    /*% ripper: END!($3) %*/
		    }
		| command_asgn
		| mlhs '=' lex_ctxt command_call
		    {
		    /*%%%*/
			value_expr($4);
			$$ = node_assign(p, $1, $4, $3, &@$);
		    /*% %*/
		    /*% ripper: massign!($1, $4) %*/
		    }
		| lhs '=' lex_ctxt mrhs
		    {
		    /*%%%*/
			value_expr($4);
			$$ = node_assign(p, $1, $4, $3, &@$);
		    /*% %*/
		    /*% ripper: assign!($1, $4) %*/
		    }
                | mlhs '=' lex_ctxt mrhs_arg modifier_rescue stmt
                    {
                    /*%%%*/
                        YYLTYPE loc = code_loc_gen(&@5, &@6);
                        value_expr($4);
			$$ = node_assign(p, $1, NEW_RESCUE($4, NEW_RESBODY(0, remove_begin($6), 0, &loc), 0, &@$), $3, &@$);
                    /*% %*/
                    /*% ripper: massign!($1, rescue_mod!($4, $6)) %*/
                    }
		| mlhs '=' lex_ctxt mrhs_arg
		    {
		    /*%%%*/
			$$ = node_assign(p, $1, $4, $3, &@$);
		    /*% %*/
		    /*% ripper: massign!($1, $4) %*/
		    }
		| expr
		;

command_asgn	: lhs '=' lex_ctxt command_rhs
		    {
		    /*%%%*/
			$$ = node_assign(p, $1, $4, $3, &@$);
		    /*% %*/
		    /*% ripper: assign!($1, $4) %*/
		    }
		| var_lhs tOP_ASGN lex_ctxt command_rhs
		    {
		    /*%%%*/
			$$ = new_op_assign(p, $1, $2, $4, $3, &@$);
		    /*% %*/
		    /*% ripper: opassign!($1, $2, $4) %*/
		    }
		| primary_value '[' opt_call_args rbracket tOP_ASGN lex_ctxt command_rhs
		    {
		    /*%%%*/
			$$ = new_ary_op_assign(p, $1, $3, $5, $7, &@3, &@$);
		    /*% %*/
		    /*% ripper: opassign!(aref_field!($1, escape_Qundef($3)), $5, $7) %*/

		    }
		| primary_value call_op tIDENTIFIER tOP_ASGN lex_ctxt command_rhs
		    {
		    /*%%%*/
			$$ = new_attr_op_assign(p, $1, $2, $3, $4, $6, &@$);
		    /*% %*/
		    /*% ripper: opassign!(field!($1, $2, $3), $4, $6) %*/
		    }
		| primary_value call_op tCONSTANT tOP_ASGN lex_ctxt command_rhs
		    {
		    /*%%%*/
			$$ = new_attr_op_assign(p, $1, $2, $3, $4, $6, &@$);
		    /*% %*/
		    /*% ripper: opassign!(field!($1, $2, $3), $4, $6) %*/
		    }
		| primary_value tCOLON2 tCONSTANT tOP_ASGN lex_ctxt command_rhs
		    {
		    /*%%%*/
			YYLTYPE loc = code_loc_gen(&@1, &@3);
			$$ = new_const_op_assign(p, NEW_COLON2($1, $3, &loc), $4, $6, $5, &@$);
		    /*% %*/
		    /*% ripper: opassign!(const_path_field!($1, $3), $4, $6) %*/
		    }
		| primary_value tCOLON2 tIDENTIFIER tOP_ASGN lex_ctxt command_rhs
		    {
		    /*%%%*/
			$$ = new_attr_op_assign(p, $1, ID2VAL(idCOLON2), $3, $4, $6, &@$);
		    /*% %*/
		    /*% ripper: opassign!(field!($1, ID2VAL(idCOLON2), $3), $4, $6) %*/
		    }
		| backref tOP_ASGN lex_ctxt command_rhs
		    {
		    /*%%%*/
			rb_backref_error(p, $1);
			$$ = NEW_BEGIN(0, &@$);
		    /*% %*/
		    /*% ripper[error]: backref_error(p, RNODE($1), assign!(var_field(p, $1), $4)) %*/
		    }
		;

command_rhs	: command_call   %prec tOP_ASGN
		    {
			value_expr($1);
			$$ = $1;
		    }
		| command_call modifier_rescue stmt
		    {
		    /*%%%*/
			YYLTYPE loc = code_loc_gen(&@2, &@3);
			value_expr($1);
			$$ = NEW_RESCUE($1, NEW_RESBODY(0, remove_begin($3), 0, &loc), 0, &@$);
		    /*% %*/
		    /*% ripper: rescue_mod!($1, $3) %*/
		    }
		| command_asgn
		;

expr		: command_call
		| expr keyword_and expr
		    {
			$$ = logop(p, idAND, $1, $3, &@2, &@$);
		    }
		| expr keyword_or expr
		    {
			$$ = logop(p, idOR, $1, $3, &@2, &@$);
		    }
		| keyword_not opt_nl expr
		    {
			$$ = call_uni_op(p, method_cond(p, $3, &@3), METHOD_NOT, &@1, &@$);
		    }
		| '!' command_call
		    {
			$$ = call_uni_op(p, method_cond(p, $2, &@2), '!', &@1, &@$);
		    }
		| arg tASSOC
		    {
			value_expr($1);
			SET_LEX_STATE(EXPR_BEG|EXPR_LABEL);
			p->command_start = FALSE;
			$<ctxt>$ = p->ctxt;
			p->ctxt.in_kwarg = 1;
		    }
		    {$<tbl>$ = push_pvtbl(p);}
		  p_expr
		    {pop_pvtbl(p, $<tbl>4);}
		    {
			p->ctxt.in_kwarg = $<ctxt>3.in_kwarg;
		    /*%%%*/
			$$ = NEW_CASE3($1, NEW_IN($5, 0, 0, &@5), &@$);
			warn_one_line_pattern_matching(p, $$, $5, true);
		    /*% %*/
		    /*% ripper: case!($1, in!($5, Qnil, Qnil)) %*/
		    }
		| arg keyword_in
		    {
			value_expr($1);
			SET_LEX_STATE(EXPR_BEG|EXPR_LABEL);
			p->command_start = FALSE;
			$<ctxt>$ = p->ctxt;
			p->ctxt.in_kwarg = 1;
		    }
		    {$<tbl>$ = push_pvtbl(p);}
		  p_expr
		    {pop_pvtbl(p, $<tbl>4);}
		    {
			p->ctxt.in_kwarg = $<ctxt>3.in_kwarg;
		    /*%%%*/
			$$ = NEW_CASE3($1, NEW_IN($5, NEW_TRUE(&@5), NEW_FALSE(&@5), &@5), &@$);
			warn_one_line_pattern_matching(p, $$, $5, false);
		    /*% %*/
		    /*% ripper: case!($1, in!($5, Qnil, Qnil)) %*/
		    }
		| arg %prec tLBRACE_ARG
		;

def_name	: fname
		    {
			ID fname = get_id($1);
			ID cur_arg = p->cur_arg;
			YYSTYPE c = {.ctxt = p->ctxt};
			numparam_name(p, fname);
			local_push(p, 0);
			p->cur_arg = 0;
			p->ctxt.in_def = 1;
			$<node>$ = NEW_NODE(NODE_SELF, /*vid*/cur_arg, /*mid*/fname, /*cval*/c.val, &@$);
		    /*%%%*/
		    /*%
			$$ = NEW_RIPPER(fname, get_value($1), $$, &NULL_LOC);
		    %*/
		    }
		;

defn_head	: k_def def_name
		    {
			$$ = $2;
		    /*%%%*/
			$$ = NEW_NODE(NODE_DEFN, 0, $$->nd_mid, $$, &@$);
		    /*% %*/
		    }
		;

defs_head	: k_def singleton dot_or_colon {SET_LEX_STATE(EXPR_FNAME);} def_name
		    {
			SET_LEX_STATE(EXPR_ENDFN|EXPR_LABEL); /* force for args */
			$$ = $5;
		    /*%%%*/
			$$ = NEW_NODE(NODE_DEFS, $2, $$->nd_mid, $$, &@$);
		    /*%
			VALUE ary = rb_ary_new_from_args(3, $2, $3, get_value($$));
			add_mark_object(p, ary);
			$<node>$->nd_rval = ary;
		    %*/
		    }
		;

expr_value	: expr
		    {
			value_expr($1);
			$$ = $1;
		    }
		;

expr_value_do	: {COND_PUSH(1);} expr_value do {COND_POP();}
		    {
			$$ = $2;
		    }


command_call	: command
		| block_command
		;

block_command	: block_call
		| block_call call_op2 operation2 command_args
		    {
		    /*%%%*/
			$$ = new_qcall(p, $2, $1, $3, $4, &@3, &@$);
		    /*% %*/
		    /*% ripper: method_add_arg!(call!($1, $2, $3), $4) %*/
		    }
		;

cmd_brace_block	: tLBRACE_ARG brace_body '}'
		    {
			$$ = $2;
		    /*%%%*/
			$$->nd_body->nd_loc = code_loc_gen(&@1, &@3);
			nd_set_line($$, @1.end_pos.lineno);
		    /*% %*/
		    }
		;

fcall		: operation
		    {
		    /*%%%*/
			$$ = NEW_FCALL($1, 0, &@$);
			nd_set_line($$, p->tokline);
		    /*% %*/
		    /*% ripper: $1 %*/
		    }
		;

command		: fcall command_args       %prec tLOWEST
		    {
		    /*%%%*/
			$1->nd_args = $2;
			nd_set_last_loc($1, @2.end_pos);
			$$ = $1;
		    /*% %*/
		    /*% ripper: command!($1, $2) %*/
		    }
		| fcall command_args cmd_brace_block
		    {
		    /*%%%*/
			block_dup_check(p, $2, $3);
			$1->nd_args = $2;
			$$ = method_add_block(p, $1, $3, &@$);
			fixpos($$, $1);
			nd_set_last_loc($1, @2.end_pos);
		    /*% %*/
		    /*% ripper: method_add_block!(command!($1, $2), $3) %*/
		    }
		| primary_value call_op operation2 command_args	%prec tLOWEST
		    {
		    /*%%%*/
			$$ = new_command_qcall(p, $2, $1, $3, $4, Qnull, &@3, &@$);
		    /*% %*/
		    /*% ripper: command_call!($1, $2, $3, $4) %*/
		    }
		| primary_value call_op operation2 command_args cmd_brace_block
		    {
		    /*%%%*/
			$$ = new_command_qcall(p, $2, $1, $3, $4, $5, &@3, &@$);
		    /*% %*/
		    /*% ripper: method_add_block!(command_call!($1, $2, $3, $4), $5) %*/
		    }
		| primary_value tCOLON2 operation2 command_args	%prec tLOWEST
		    {
		    /*%%%*/
			$$ = new_command_qcall(p, ID2VAL(idCOLON2), $1, $3, $4, Qnull, &@3, &@$);
		    /*% %*/
		    /*% ripper: command_call!($1, ID2VAL(idCOLON2), $3, $4) %*/
		    }
		| primary_value tCOLON2 operation2 command_args cmd_brace_block
		    {
		    /*%%%*/
			$$ = new_command_qcall(p, ID2VAL(idCOLON2), $1, $3, $4, $5, &@3, &@$);
		    /*% %*/
		    /*% ripper: method_add_block!(command_call!($1, ID2VAL(idCOLON2), $3, $4), $5) %*/
		   }
		| keyword_super command_args
		    {
		    /*%%%*/
			$$ = NEW_SUPER($2, &@$);
			fixpos($$, $2);
		    /*% %*/
		    /*% ripper: super!($2) %*/
		    }
		| keyword_yield command_args
		    {
		    /*%%%*/
			$$ = new_yield(p, $2, &@$);
			fixpos($$, $2);
		    /*% %*/
		    /*% ripper: yield!($2) %*/
		    }
		| k_return call_args
		    {
		    /*%%%*/
			$$ = NEW_RETURN(ret_args(p, $2), &@$);
		    /*% %*/
		    /*% ripper: return!($2) %*/
		    }
		| keyword_break call_args
		    {
		    /*%%%*/
			$$ = NEW_BREAK(ret_args(p, $2), &@$);
		    /*% %*/
		    /*% ripper: break!($2) %*/
		    }
		| keyword_next call_args
		    {
		    /*%%%*/
			$$ = NEW_NEXT(ret_args(p, $2), &@$);
		    /*% %*/
		    /*% ripper: next!($2) %*/
		    }
		;

mlhs		: mlhs_basic
		| tLPAREN mlhs_inner rparen
		    {
		    /*%%%*/
			$$ = $2;
		    /*% %*/
		    /*% ripper: mlhs_paren!($2) %*/
		    }
		;

mlhs_inner	: mlhs_basic
		| tLPAREN mlhs_inner rparen
		    {
		    /*%%%*/
			$$ = NEW_MASGN(NEW_LIST($2, &@$), 0, &@$);
		    /*% %*/
		    /*% ripper: mlhs_paren!($2) %*/
		    }
		;

mlhs_basic	: mlhs_head
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, 0, &@$);
		    /*% %*/
		    /*% ripper: $1 %*/
		    }
		| mlhs_head mlhs_item
		    {
		    /*%%%*/
			$$ = NEW_MASGN(list_append(p, $1,$2), 0, &@$);
		    /*% %*/
		    /*% ripper: mlhs_add!($1, $2) %*/
		    }
		| mlhs_head tSTAR mlhs_node
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, $3, &@$);
		    /*% %*/
		    /*% ripper: mlhs_add_star!($1, $3) %*/
		    }
		| mlhs_head tSTAR mlhs_node ',' mlhs_post
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, NEW_POSTARG($3,$5,&@$), &@$);
		    /*% %*/
		    /*% ripper: mlhs_add_post!(mlhs_add_star!($1, $3), $5) %*/
		    }
		| mlhs_head tSTAR
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, NODE_SPECIAL_NO_NAME_REST, &@$);
		    /*% %*/
		    /*% ripper: mlhs_add_star!($1, Qnil) %*/
		    }
		| mlhs_head tSTAR ',' mlhs_post
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, NEW_POSTARG(NODE_SPECIAL_NO_NAME_REST, $4, &@$), &@$);
		    /*% %*/
		    /*% ripper: mlhs_add_post!(mlhs_add_star!($1, Qnil), $4) %*/
		    }
		| tSTAR mlhs_node
		    {
		    /*%%%*/
			$$ = NEW_MASGN(0, $2, &@$);
		    /*% %*/
		    /*% ripper: mlhs_add_star!(mlhs_new!, $2) %*/
		    }
		| tSTAR mlhs_node ',' mlhs_post
		    {
		    /*%%%*/
			$$ = NEW_MASGN(0, NEW_POSTARG($2,$4,&@$), &@$);
		    /*% %*/
		    /*% ripper: mlhs_add_post!(mlhs_add_star!(mlhs_new!, $2), $4) %*/
		    }
		| tSTAR
		    {
		    /*%%%*/
			$$ = NEW_MASGN(0, NODE_SPECIAL_NO_NAME_REST, &@$);
		    /*% %*/
		    /*% ripper: mlhs_add_star!(mlhs_new!, Qnil) %*/
		    }
		| tSTAR ',' mlhs_post
		    {
		    /*%%%*/
			$$ = NEW_MASGN(0, NEW_POSTARG(NODE_SPECIAL_NO_NAME_REST, $3, &@$), &@$);
		    /*% %*/
		    /*% ripper: mlhs_add_post!(mlhs_add_star!(mlhs_new!, Qnil), $3) %*/
		    }
		;

mlhs_item	: mlhs_node
		| tLPAREN mlhs_inner rparen
		    {
		    /*%%%*/
			$$ = $2;
		    /*% %*/
		    /*% ripper: mlhs_paren!($2) %*/
		    }
		;

mlhs_head	: mlhs_item ','
		    {
		    /*%%%*/
			$$ = NEW_LIST($1, &@1);
		    /*% %*/
		    /*% ripper: mlhs_add!(mlhs_new!, $1) %*/
		    }
		| mlhs_head mlhs_item ','
		    {
		    /*%%%*/
			$$ = list_append(p, $1, $2);
		    /*% %*/
		    /*% ripper: mlhs_add!($1, $2) %*/
		    }
		;

mlhs_post	: mlhs_item
		    {
		    /*%%%*/
			$$ = NEW_LIST($1, &@$);
		    /*% %*/
		    /*% ripper: mlhs_add!(mlhs_new!, $1) %*/
		    }
		| mlhs_post ',' mlhs_item
		    {
		    /*%%%*/
			$$ = list_append(p, $1, $3);
		    /*% %*/
		    /*% ripper: mlhs_add!($1, $3) %*/
		    }
		;

mlhs_node	: user_variable
		    {
		    /*%%%*/
			$$ = assignable(p, $1, 0, &@$);
		    /*% %*/
		    /*% ripper: assignable(p, var_field(p, $1)) %*/
		    }
		| keyword_variable
		    {
		    /*%%%*/
			$$ = assignable(p, $1, 0, &@$);
		    /*% %*/
		    /*% ripper: assignable(p, var_field(p, $1)) %*/
		    }
		| primary_value '[' opt_call_args rbracket
		    {
		    /*%%%*/
			$$ = aryset(p, $1, $3, &@$);
		    /*% %*/
		    /*% ripper: aref_field!($1, escape_Qundef($3)) %*/
		    }
		| primary_value call_op tIDENTIFIER
		    {
			if ($2 == tANDDOT) {
			    yyerror1(&@2, "&. inside multiple assignment destination");
			}
		    /*%%%*/
			$$ = attrset(p, $1, $2, $3, &@$);
		    /*% %*/
		    /*% ripper: field!($1, $2, $3) %*/
		    }
		| primary_value tCOLON2 tIDENTIFIER
		    {
		    /*%%%*/
			$$ = attrset(p, $1, idCOLON2, $3, &@$);
		    /*% %*/
		    /*% ripper: const_path_field!($1, $3) %*/
		    }
		| primary_value call_op tCONSTANT
		    {
			if ($2 == tANDDOT) {
			    yyerror1(&@2, "&. inside multiple assignment destination");
			}
		    /*%%%*/
			$$ = attrset(p, $1, $2, $3, &@$);
		    /*% %*/
		    /*% ripper: field!($1, $2, $3) %*/
		    }
		| primary_value tCOLON2 tCONSTANT
		    {
		    /*%%%*/
			$$ = const_decl(p, NEW_COLON2($1, $3, &@$), &@$);
		    /*% %*/
		    /*% ripper: const_decl(p, const_path_field!($1, $3)) %*/
		    }
		| tCOLON3 tCONSTANT
		    {
		    /*%%%*/
			$$ = const_decl(p, NEW_COLON3($2, &@$), &@$);
		    /*% %*/
		    /*% ripper: const_decl(p, top_const_field!($2)) %*/
		    }
		| backref
		    {
		    /*%%%*/
			rb_backref_error(p, $1);
			$$ = NEW_BEGIN(0, &@$);
		    /*% %*/
		    /*% ripper[error]: backref_error(p, RNODE($1), var_field(p, $1)) %*/
		    }
		;

lhs		: user_variable
		    {
		    /*%%%*/
			$$ = assignable(p, $1, 0, &@$);
		    /*% %*/
		    /*% ripper: assignable(p, var_field(p, $1)) %*/
		    }
		| keyword_variable
		    {
		    /*%%%*/
			$$ = assignable(p, $1, 0, &@$);
		    /*% %*/
		    /*% ripper: assignable(p, var_field(p, $1)) %*/
		    }
		| primary_value '[' opt_call_args rbracket
		    {
		    /*%%%*/
			$$ = aryset(p, $1, $3, &@$);
		    /*% %*/
		    /*% ripper: aref_field!($1, escape_Qundef($3)) %*/
		    }
		| primary_value call_op tIDENTIFIER
		    {
		    /*%%%*/
			$$ = attrset(p, $1, $2, $3, &@$);
		    /*% %*/
		    /*% ripper: field!($1, $2, $3) %*/
		    }
		| primary_value tCOLON2 tIDENTIFIER
		    {
		    /*%%%*/
			$$ = attrset(p, $1, idCOLON2, $3, &@$);
		    /*% %*/
		    /*% ripper: field!($1, ID2VAL(idCOLON2), $3) %*/
		    }
		| primary_value call_op tCONSTANT
		    {
		    /*%%%*/
			$$ = attrset(p, $1, $2, $3, &@$);
		    /*% %*/
		    /*% ripper: field!($1, $2, $3) %*/
		    }
		| primary_value tCOLON2 tCONSTANT
		    {
		    /*%%%*/
			$$ = const_decl(p, NEW_COLON2($1, $3, &@$), &@$);
		    /*% %*/
		    /*% ripper: const_decl(p, const_path_field!($1, $3)) %*/
		    }
		| tCOLON3 tCONSTANT
		    {
		    /*%%%*/
			$$ = const_decl(p, NEW_COLON3($2, &@$), &@$);
		    /*% %*/
		    /*% ripper: const_decl(p, top_const_field!($2)) %*/
		    }
		| backref
		    {
		    /*%%%*/
			rb_backref_error(p, $1);
			$$ = NEW_BEGIN(0, &@$);
		    /*% %*/
		    /*% ripper[error]: backref_error(p, RNODE($1), var_field(p, $1)) %*/
		    }
		;

cname		: tIDENTIFIER
		    {
			static const char mesg[] = "class/module name must be CONSTANT";
		    /*%%%*/
			yyerror1(&@1, mesg);
		    /*% %*/
		    /*% ripper[error]: class_name_error!(ERR_MESG(), $1) %*/
		    }
		| tCONSTANT
		;

cpath		: tCOLON3 cname
		    {
		    /*%%%*/
			$$ = NEW_COLON3($2, &@$);
		    /*% %*/
		    /*% ripper: top_const_ref!($2) %*/
		    }
		| cname
		    {
		    /*%%%*/
			$$ = NEW_COLON2(0, $$, &@$);
		    /*% %*/
		    /*% ripper: const_ref!($1) %*/
		    }
		| primary_value tCOLON2 cname
		    {
		    /*%%%*/
			$$ = NEW_COLON2($1, $3, &@$);
		    /*% %*/
		    /*% ripper: const_path_ref!($1, $3) %*/
		    }
		;

fname		: tIDENTIFIER
		| tCONSTANT
		| tFID
		| op
		    {
			SET_LEX_STATE(EXPR_ENDFN);
			$$ = $1;
		    }
		| reswords
		;

fitem		: fname
		    {
		    /*%%%*/
			$$ = NEW_LIT(ID2SYM($1), &@$);
		    /*% %*/
		    /*% ripper: symbol_literal!($1) %*/
		    }
		| symbol
		;

undef_list	: fitem
		    {
		    /*%%%*/
			$$ = NEW_UNDEF($1, &@$);
		    /*% %*/
		    /*% ripper: rb_ary_new3(1, get_value($1)) %*/
		    }
		| undef_list ',' {SET_LEX_STATE(EXPR_FNAME|EXPR_FITEM);} fitem
		    {
		    /*%%%*/
			NODE *undef = NEW_UNDEF($4, &@4);
			$$ = block_append(p, $1, undef);
		    /*% %*/
		    /*% ripper: rb_ary_push($1, get_value($4)) %*/
		    }
		;

op		: '|'		{ ifndef_ripper($$ = '|'); }
		| '^'		{ ifndef_ripper($$ = '^'); }
		| '&'		{ ifndef_ripper($$ = '&'); }
		| tCMP		{ ifndef_ripper($$ = tCMP); }
		| tEQ		{ ifndef_ripper($$ = tEQ); }
		| tEQQ		{ ifndef_ripper($$ = tEQQ); }
		| tMATCH	{ ifndef_ripper($$ = tMATCH); }
		| tNMATCH	{ ifndef_ripper($$ = tNMATCH); }
		| '>'		{ ifndef_ripper($$ = '>'); }
		| tGEQ		{ ifndef_ripper($$ = tGEQ); }
		| '<'		{ ifndef_ripper($$ = '<'); }
		| tLEQ		{ ifndef_ripper($$ = tLEQ); }
		| tNEQ		{ ifndef_ripper($$ = tNEQ); }
		| tLSHFT	{ ifndef_ripper($$ = tLSHFT); }
		| tRSHFT	{ ifndef_ripper($$ = tRSHFT); }
		| '+'		{ ifndef_ripper($$ = '+'); }
		| '-'		{ ifndef_ripper($$ = '-'); }
		| '*'		{ ifndef_ripper($$ = '*'); }
		| tSTAR		{ ifndef_ripper($$ = '*'); }
		| '/'		{ ifndef_ripper($$ = '/'); }
		| '%'		{ ifndef_ripper($$ = '%'); }
		| tPOW		{ ifndef_ripper($$ = tPOW); }
		| tDSTAR	{ ifndef_ripper($$ = tDSTAR); }
		| '!'		{ ifndef_ripper($$ = '!'); }
		| '~'		{ ifndef_ripper($$ = '~'); }
		| tUPLUS	{ ifndef_ripper($$ = tUPLUS); }
		| tUMINUS	{ ifndef_ripper($$ = tUMINUS); }
		| tAREF		{ ifndef_ripper($$ = tAREF); }
		| tASET		{ ifndef_ripper($$ = tASET); }
		| '`'		{ ifndef_ripper($$ = '`'); }
		;

reswords	: keyword__LINE__ | keyword__FILE__ | keyword__ENCODING__
		| keyword_BEGIN | keyword_END
		| keyword_alias | keyword_and | keyword_begin
		| keyword_break | keyword_case | keyword_class | keyword_def
		| keyword_defined | keyword_do | keyword_else | keyword_elsif
		| keyword_end | keyword_ensure | keyword_false
		| keyword_for | keyword_in | keyword_module | keyword_next
		| keyword_nil | keyword_not | keyword_or | keyword_redo
		| keyword_rescue | keyword_retry | keyword_return | keyword_self
		| keyword_super | keyword_then | keyword_true | keyword_undef
		| keyword_when | keyword_yield | keyword_if | keyword_unless
		| keyword_while | keyword_until
		;

arg		: lhs '=' lex_ctxt arg_rhs
		    {
		    /*%%%*/
			$$ = node_assign(p, $1, $4, $3, &@$);
		    /*% %*/
		    /*% ripper: assign!($1, $4) %*/
		    }
		| var_lhs tOP_ASGN lex_ctxt arg_rhs
		    {
		    /*%%%*/
			$$ = new_op_assign(p, $1, $2, $4, $3, &@$);
		    /*% %*/
		    /*% ripper: opassign!($1, $2, $4) %*/
		    }
		| primary_value '[' opt_call_args rbracket tOP_ASGN lex_ctxt arg_rhs
		    {
		    /*%%%*/
			$$ = new_ary_op_assign(p, $1, $3, $5, $7, &@3, &@$);
		    /*% %*/
		    /*% ripper: opassign!(aref_field!($1, escape_Qundef($3)), $5, $7) %*/
		    }
		| primary_value call_op tIDENTIFIER tOP_ASGN lex_ctxt arg_rhs
		    {
		    /*%%%*/
			$$ = new_attr_op_assign(p, $1, $2, $3, $4, $6, &@$);
		    /*% %*/
		    /*% ripper: opassign!(field!($1, $2, $3), $4, $6) %*/
		    }
		| primary_value call_op tCONSTANT tOP_ASGN lex_ctxt arg_rhs
		    {
		    /*%%%*/
			$$ = new_attr_op_assign(p, $1, $2, $3, $4, $6, &@$);
		    /*% %*/
		    /*% ripper: opassign!(field!($1, $2, $3), $4, $6) %*/
		    }
		| primary_value tCOLON2 tIDENTIFIER tOP_ASGN lex_ctxt arg_rhs
		    {
		    /*%%%*/
			$$ = new_attr_op_assign(p, $1, ID2VAL(idCOLON2), $3, $4, $6, &@$);
		    /*% %*/
		    /*% ripper: opassign!(field!($1, ID2VAL(idCOLON2), $3), $4, $6) %*/
		    }
		| primary_value tCOLON2 tCONSTANT tOP_ASGN lex_ctxt arg_rhs
		    {
		    /*%%%*/
			YYLTYPE loc = code_loc_gen(&@1, &@3);
			$$ = new_const_op_assign(p, NEW_COLON2($1, $3, &loc), $4, $6, $5, &@$);
		    /*% %*/
		    /*% ripper: opassign!(const_path_field!($1, $3), $4, $6) %*/
		    }
		| tCOLON3 tCONSTANT tOP_ASGN lex_ctxt arg_rhs
		    {
		    /*%%%*/
			$$ = new_const_op_assign(p, NEW_COLON3($2, &@$), $3, $5, $4, &@$);
		    /*% %*/
		    /*% ripper: opassign!(top_const_field!($2), $3, $5) %*/
		    }
		| backref tOP_ASGN lex_ctxt arg_rhs
		    {
		    /*%%%*/
			rb_backref_error(p, $1);
			$$ = NEW_BEGIN(0, &@$);
		    /*% %*/
		    /*% ripper[error]: backref_error(p, RNODE($1), opassign!(var_field(p, $1), $2, $4)) %*/
		    }
		| arg tDOT2 arg
		    {
		    /*%%%*/
			value_expr($1);
			value_expr($3);
			$$ = NEW_DOT2($1, $3, &@$);
		    /*% %*/
		    /*% ripper: dot2!($1, $3) %*/
		    }
		| arg tDOT3 arg
		    {
		    /*%%%*/
			value_expr($1);
			value_expr($3);
			$$ = NEW_DOT3($1, $3, &@$);
		    /*% %*/
		    /*% ripper: dot3!($1, $3) %*/
		    }
		| arg tDOT2
		    {
		    /*%%%*/
			value_expr($1);
			$$ = NEW_DOT2($1, new_nil_at(p, &@2.end_pos), &@$);
		    /*% %*/
		    /*% ripper: dot2!($1, Qnil) %*/
		    }
		| arg tDOT3
		    {
		    /*%%%*/
			value_expr($1);
			$$ = NEW_DOT3($1, new_nil_at(p, &@2.end_pos), &@$);
		    /*% %*/
		    /*% ripper: dot3!($1, Qnil) %*/
		    }
		| tBDOT2 arg
		    {
		    /*%%%*/
			value_expr($2);
			$$ = NEW_DOT2(new_nil_at(p, &@1.beg_pos), $2, &@$);
		    /*% %*/
		    /*% ripper: dot2!(Qnil, $2) %*/
		    }
		| tBDOT3 arg
		    {
		    /*%%%*/
			value_expr($2);
			$$ = NEW_DOT3(new_nil_at(p, &@1.beg_pos), $2, &@$);
		    /*% %*/
		    /*% ripper: dot3!(Qnil, $2) %*/
		    }
		| arg '+' arg
		    {
			$$ = call_bin_op(p, $1, '+', $3, &@2, &@$);
		    }
		| arg '-' arg
		    {
			$$ = call_bin_op(p, $1, '-', $3, &@2, &@$);
		    }
		| arg '*' arg
		    {
			$$ = call_bin_op(p, $1, '*', $3, &@2, &@$);
		    }
		| arg '/' arg
		    {
			$$ = call_bin_op(p, $1, '/', $3, &@2, &@$);
		    }
		| arg '%' arg
		    {
			$$ = call_bin_op(p, $1, '%', $3, &@2, &@$);
		    }
		| arg tPOW arg
		    {
			$$ = call_bin_op(p, $1, idPow, $3, &@2, &@$);
		    }
		| tUMINUS_NUM simple_numeric tPOW arg
		    {
			$$ = call_uni_op(p, call_bin_op(p, $2, idPow, $4, &@2, &@$), idUMinus, &@1, &@$);
		    }
		| tUPLUS arg
		    {
			$$ = call_uni_op(p, $2, idUPlus, &@1, &@$);
		    }
		| tUMINUS arg
		    {
			$$ = call_uni_op(p, $2, idUMinus, &@1, &@$);
		    }
		| arg '|' arg
		    {
			$$ = call_bin_op(p, $1, '|', $3, &@2, &@$);
		    }
		| arg '^' arg
		    {
			$$ = call_bin_op(p, $1, '^', $3, &@2, &@$);
		    }
		| arg '&' arg
		    {
			$$ = call_bin_op(p, $1, '&', $3, &@2, &@$);
		    }
		| arg tCMP arg
		    {
			$$ = call_bin_op(p, $1, idCmp, $3, &@2, &@$);
		    }
		| rel_expr   %prec tCMP
		| arg tEQ arg
		    {
			$$ = call_bin_op(p, $1, idEq, $3, &@2, &@$);
		    }
		| arg tEQQ arg
		    {
			$$ = call_bin_op(p, $1, idEqq, $3, &@2, &@$);
		    }
		| arg tNEQ arg
		    {
			$$ = call_bin_op(p, $1, idNeq, $3, &@2, &@$);
		    }
		| arg tMATCH arg
		    {
			$$ = match_op(p, $1, $3, &@2, &@$);
		    }
		| arg tNMATCH arg
		    {
			$$ = call_bin_op(p, $1, idNeqTilde, $3, &@2, &@$);
		    }
		| '!' arg
		    {
			$$ = call_uni_op(p, method_cond(p, $2, &@2), '!', &@1, &@$);
		    }
		| '~' arg
		    {
			$$ = call_uni_op(p, $2, '~', &@1, &@$);
		    }
		| arg tLSHFT arg
		    {
			$$ = call_bin_op(p, $1, idLTLT, $3, &@2, &@$);
		    }
		| arg tRSHFT arg
		    {
			$$ = call_bin_op(p, $1, idGTGT, $3, &@2, &@$);
		    }
		| arg tANDOP arg
		    {
			$$ = logop(p, idANDOP, $1, $3, &@2, &@$);
		    }
		| arg tOROP arg
		    {
			$$ = logop(p, idOROP, $1, $3, &@2, &@$);
		    }
		| keyword_defined opt_nl {p->ctxt.in_defined = 1;} arg
		    {
			p->ctxt.in_defined = 0;
			$$ = new_defined(p, $4, &@$);
		    }
		| arg '?' arg opt_nl ':' arg
		    {
		    /*%%%*/
			value_expr($1);
			$$ = new_if(p, $1, $3, $6, &@$);
			fixpos($$, $1);
		    /*% %*/
		    /*% ripper: ifop!($1, $3, $6) %*/
		    }
		| defn_head f_opt_paren_args '=' arg
		    {
			endless_method_name(p, $<node>1, &@1);
			restore_defun(p, $<node>1->nd_defn);
		    /*%%%*/
			$$ = set_defun_body(p, $1, $2, $4, &@$);
		    /*% %*/
		    /*% ripper: def!(get_value($1), $2, $4) %*/
			local_pop(p);
		    }
		| defn_head f_opt_paren_args '=' arg modifier_rescue arg
		    {
			endless_method_name(p, $<node>1, &@1);
			restore_defun(p, $<node>1->nd_defn);
		    /*%%%*/
			$4 = rescued_expr(p, $4, $6, &@4, &@5, &@6);
			$$ = set_defun_body(p, $1, $2, $4, &@$);
		    /*% %*/
		    /*% ripper: def!(get_value($1), $2, rescue_mod!($4, $6)) %*/
			local_pop(p);
		    }
		| defs_head f_opt_paren_args '=' arg
		    {
			endless_method_name(p, $<node>1, &@1);
			restore_defun(p, $<node>1->nd_defn);
		    /*%%%*/
			$$ = set_defun_body(p, $1, $2, $4, &@$);
		    /*%
			$1 = get_value($1);
		    %*/
		    /*% ripper: defs!(AREF($1, 0), AREF($1, 1), AREF($1, 2), $2, $4) %*/
			local_pop(p);
		    }
		| defs_head f_opt_paren_args '=' arg modifier_rescue arg
		    {
			endless_method_name(p, $<node>1, &@1);
			restore_defun(p, $<node>1->nd_defn);
		    /*%%%*/
			$4 = rescued_expr(p, $4, $6, &@4, &@5, &@6);
			$$ = set_defun_body(p, $1, $2, $4, &@$);
		    /*%
			$1 = get_value($1);
		    %*/
		    /*% ripper: defs!(AREF($1, 0), AREF($1, 1), AREF($1, 2), $2, rescue_mod!($4, $6)) %*/
			local_pop(p);
		    }
		| primary
		    {
			$$ = $1;
		    }
		;

relop		: '>'  {$$ = '>';}
		| '<'  {$$ = '<';}
		| tGEQ {$$ = idGE;}
		| tLEQ {$$ = idLE;}
		;

rel_expr	: arg relop arg   %prec '>'
		    {
			$$ = call_bin_op(p, $1, $2, $3, &@2, &@$);
		    }
		| rel_expr relop arg   %prec '>'
		    {
			rb_warning1("comparison '%s' after comparison", WARN_ID($2));
			$$ = call_bin_op(p, $1, $2, $3, &@2, &@$);
		    }
		;

lex_ctxt	: tSP
		    {
			$$ = p->ctxt;
		    }
		| none
		    {
			$$ = p->ctxt;
		    }
		;

arg_value	: arg
		    {
			value_expr($1);
			$$ = $1;
		    }
		;

aref_args	: none
		| args trailer
		    {
			$$ = $1;
		    }
		| args ',' assocs trailer
		    {
		    /*%%%*/
			$$ = $3 ? arg_append(p, $1, new_hash(p, $3, &@3), &@$) : $1;
		    /*% %*/
		    /*% ripper: args_add!($1, bare_assoc_hash!($3)) %*/
		    }
		| assocs trailer
		    {
		    /*%%%*/
			$$ = $1 ? NEW_LIST(new_hash(p, $1, &@1), &@$) : 0;
		    /*% %*/
		    /*% ripper: args_add!(args_new!, bare_assoc_hash!($1)) %*/
		    }
		;

arg_rhs 	: arg   %prec tOP_ASGN
		    {
			value_expr($1);
			$$ = $1;
		    }
		| arg modifier_rescue arg
		    {
		    /*%%%*/
			value_expr($1);
			$$ = rescued_expr(p, $1, $3, &@1, &@2, &@3);
		    /*% %*/
		    /*% ripper: rescue_mod!($1, $3) %*/
		    }
		;

paren_args	: '(' opt_call_args rparen
		    {
		    /*%%%*/
			$$ = $2;
		    /*% %*/
		    /*% ripper: arg_paren!(escape_Qundef($2)) %*/
		    }
		| '(' args ',' args_forward rparen
		    {
			if (!check_forwarding_args(p)) {
			    $$ = Qnone;
			}
			else {
			/*%%%*/
			    $$ = new_args_forward_call(p, $2, &@4, &@$);
			/*% %*/
			/*% ripper: arg_paren!(args_add!($2, $4)) %*/
			}
		    }
		| '(' args_forward rparen
		    {
			if (!check_forwarding_args(p)) {
			    $$ = Qnone;
			}
			else {
			/*%%%*/
			    $$ = new_args_forward_call(p, 0, &@2, &@$);
			/*% %*/
			/*% ripper: arg_paren!($2) %*/
			}
		    }
		;

opt_paren_args	: none
		| paren_args
		;

opt_call_args	: none
		| call_args
		| args ','
		    {
		      $$ = $1;
		    }
		| args ',' assocs ','
		    {
		    /*%%%*/
			$$ = $3 ? arg_append(p, $1, new_hash(p, $3, &@3), &@$) : $1;
		    /*% %*/
		    /*% ripper: args_add!($1, bare_assoc_hash!($3)) %*/
		    }
		| assocs ','
		    {
		    /*%%%*/
			$$ = $1 ? NEW_LIST(new_hash(p, $1, &@1), &@1) : 0;
		    /*% %*/
		    /*% ripper: args_add!(args_new!, bare_assoc_hash!($1)) %*/
		    }
		;

call_args	: command
		    {
		    /*%%%*/
			value_expr($1);
			$$ = NEW_LIST($1, &@$);
		    /*% %*/
		    /*% ripper: args_add!(args_new!, $1) %*/
		    }
		| args opt_block_arg
		    {
		    /*%%%*/
			$$ = arg_blk_pass($1, $2);
		    /*% %*/
		    /*% ripper: args_add_block!($1, $2) %*/
		    }
		| assocs opt_block_arg
		    {
		    /*%%%*/
			$$ = $1 ? NEW_LIST(new_hash(p, $1, &@1), &@1) : 0;
			$$ = arg_blk_pass($$, $2);
		    /*% %*/
		    /*% ripper: args_add_block!(args_add!(args_new!, bare_assoc_hash!($1)), $2) %*/
		    }
		| args ',' assocs opt_block_arg
		    {
		    /*%%%*/
			$$ = $3 ? arg_append(p, $1, new_hash(p, $3, &@3), &@$) : $1;
			$$ = arg_blk_pass($$, $4);
		    /*% %*/
		    /*% ripper: args_add_block!(args_add!($1, bare_assoc_hash!($3)), $4) %*/
		    }
		| block_arg
		    /*% ripper[brace]: args_add_block!(args_new!, $1) %*/
		;

command_args	:   {
			/* If call_args starts with a open paren '(' or '[',
			 * look-ahead reading of the letters calls CMDARG_PUSH(0),
			 * but the push must be done after CMDARG_PUSH(1).
			 * So this code makes them consistent by first cancelling
			 * the premature CMDARG_PUSH(0), doing CMDARG_PUSH(1),
			 * and finally redoing CMDARG_PUSH(0).
			 */
			int lookahead = 0;
			switch (yychar) {
			  case '(': case tLPAREN: case tLPAREN_ARG: case '[': case tLBRACK:
			    lookahead = 1;
			}
			if (lookahead) CMDARG_POP();
			CMDARG_PUSH(1);
			if (lookahead) CMDARG_PUSH(0);
		    }
		  call_args
		    {
			/* call_args can be followed by tLBRACE_ARG (that does CMDARG_PUSH(0) in the lexer)
			 * but the push must be done after CMDARG_POP() in the parser.
			 * So this code does CMDARG_POP() to pop 0 pushed by tLBRACE_ARG,
			 * CMDARG_POP() to pop 1 pushed by command_args,
			 * and CMDARG_PUSH(0) to restore back the flag set by tLBRACE_ARG.
			 */
			int lookahead = 0;
			switch (yychar) {
			  case tLBRACE_ARG:
			    lookahead = 1;
			}
			if (lookahead) CMDARG_POP();
			CMDARG_POP();
			if (lookahead) CMDARG_PUSH(0);
			$$ = $2;
		    }
		;

block_arg	: tAMPER arg_value
		    {
		    /*%%%*/
			$$ = NEW_BLOCK_PASS($2, &@$);
		    /*% %*/
		    /*% ripper: $2 %*/
		    }
		;

opt_block_arg	: ',' block_arg
		    {
			$$ = $2;
		    }
		| none
		    {
			$$ = 0;
		    }
		;

args		: arg_value
		    {
		    /*%%%*/
			$$ = NEW_LIST($1, &@$);
		    /*% %*/
		    /*% ripper: args_add!(args_new!, $1) %*/
		    }
		| tSTAR arg_value
		    {
		    /*%%%*/
			$$ = NEW_SPLAT($2, &@$);
		    /*% %*/
		    /*% ripper: args_add_star!(args_new!, $2) %*/
		    }
		| args ',' arg_value
		    {
		    /*%%%*/
			$$ = last_arg_append(p, $1, $3, &@$);
		    /*% %*/
		    /*% ripper: args_add!($1, $3) %*/
		    }
		| args ',' tSTAR arg_value
		    {
		    /*%%%*/
			$$ = rest_arg_append(p, $1, $4, &@$);
		    /*% %*/
		    /*% ripper: args_add_star!($1, $4) %*/
		    }
		;

mrhs_arg	: mrhs
		| arg_value
		;

mrhs		: args ',' arg_value
		    {
		    /*%%%*/
			$$ = last_arg_append(p, $1, $3, &@$);
		    /*% %*/
		    /*% ripper: mrhs_add!(mrhs_new_from_args!($1), $3) %*/
		    }
		| args ',' tSTAR arg_value
		    {
		    /*%%%*/
			$$ = rest_arg_append(p, $1, $4, &@$);
		    /*% %*/
		    /*% ripper: mrhs_add_star!(mrhs_new_from_args!($1), $4) %*/
		    }
		| tSTAR arg_value
		    {
		    /*%%%*/
			$$ = NEW_SPLAT($2, &@$);
		    /*% %*/
		    /*% ripper: mrhs_add_star!(mrhs_new!, $2) %*/
		    }
		;

primary		: literal
		| strings
		| xstring
		| regexp
		| words
		| qwords
		| symbols
		| qsymbols
		| var_ref
		| backref
		| tFID
		    {
		    /*%%%*/
			$$ = NEW_FCALL($1, 0, &@$);
		    /*% %*/
		    /*% ripper: method_add_arg!(fcall!($1), args_new!) %*/
		    }
		| k_begin
		    {
			CMDARG_PUSH(0);
		    }
		  bodystmt
		  k_end
		    {
			CMDARG_POP();
		    /*%%%*/
			set_line_body($3, @1.end_pos.lineno);
			$$ = NEW_BEGIN($3, &@$);
			nd_set_line($$, @1.end_pos.lineno);
		    /*% %*/
		    /*% ripper: begin!($3) %*/
		    }
		| tLPAREN_ARG {SET_LEX_STATE(EXPR_ENDARG);} rparen
		    {
		    /*%%%*/
			$$ = NEW_BEGIN(0, &@$);
		    /*% %*/
		    /*% ripper: paren!(0) %*/
		    }
		| tLPAREN_ARG stmt {SET_LEX_STATE(EXPR_ENDARG);} rparen
		    {
		    /*%%%*/
			if (nd_type($2) == NODE_SELF) $2->nd_state = 0;
			$$ = $2;
		    /*% %*/
		    /*% ripper: paren!($2) %*/
		    }
		| tLPAREN compstmt ')'
		    {
		    /*%%%*/
			if (nd_type($2) == NODE_SELF) $2->nd_state = 0;
			$$ = $2;
		    /*% %*/
		    /*% ripper: paren!($2) %*/
		    }
		| primary_value tCOLON2 tCONSTANT
		    {
		    /*%%%*/
			$$ = NEW_COLON2($1, $3, &@$);
		    /*% %*/
		    /*% ripper: const_path_ref!($1, $3) %*/
		    }
		| tCOLON3 tCONSTANT
		    {
		    /*%%%*/
			$$ = NEW_COLON3($2, &@$);
		    /*% %*/
		    /*% ripper: top_const_ref!($2) %*/
		    }
		| tLBRACK aref_args ']'
		    {
		    /*%%%*/
			$$ = make_list($2, &@$);
		    /*% %*/
		    /*% ripper: array!(escape_Qundef($2)) %*/
		    }
		| tLBRACE assoc_list '}'
		    {
		    /*%%%*/
			$$ = new_hash(p, $2, &@$);
			$$->nd_brace = TRUE;
		    /*% %*/
		    /*% ripper: hash!(escape_Qundef($2)) %*/
		    }
		| k_return
		    {
		    /*%%%*/
			$$ = NEW_RETURN(0, &@$);
		    /*% %*/
		    /*% ripper: return0! %*/
		    }
		| keyword_yield '(' call_args rparen
		    {
		    /*%%%*/
			$$ = new_yield(p, $3, &@$);
		    /*% %*/
		    /*% ripper: yield!(paren!($3)) %*/
		    }
		| keyword_yield '(' rparen
		    {
		    /*%%%*/
			$$ = NEW_YIELD(0, &@$);
		    /*% %*/
		    /*% ripper: yield!(paren!(args_new!)) %*/
		    }
		| keyword_yield
		    {
		    /*%%%*/
			$$ = NEW_YIELD(0, &@$);
		    /*% %*/
		    /*% ripper: yield0! %*/
		    }
		| keyword_defined opt_nl '(' {p->ctxt.in_defined = 1;} expr rparen
		    {
			p->ctxt.in_defined = 0;
			$$ = new_defined(p, $5, &@$);
		    }
		| keyword_not '(' expr rparen
		    {
			$$ = call_uni_op(p, method_cond(p, $3, &@3), METHOD_NOT, &@1, &@$);
		    }
		| keyword_not '(' rparen
		    {
			$$ = call_uni_op(p, method_cond(p, new_nil(&@2), &@2), METHOD_NOT, &@1, &@$);
		    }
		| fcall brace_block
		    {
		    /*%%%*/
			$$ = method_add_block(p, $1, $2, &@$);
		    /*% %*/
		    /*% ripper: method_add_block!(method_add_arg!(fcall!($1), args_new!), $2) %*/
		    }
		| method_call
		| method_call brace_block
		    {
		    /*%%%*/
			block_dup_check(p, $1->nd_args, $2);
			$$ = method_add_block(p, $1, $2, &@$);
		    /*% %*/
		    /*% ripper: method_add_block!($1, $2) %*/
		    }
		| lambda
		| k_if expr_value then
		  compstmt
		  if_tail
		  k_end
		    {
		    /*%%%*/
			$$ = new_if(p, $2, $4, $5, &@$);
			fixpos($$, $2);
		    /*% %*/
		    /*% ripper: if!($2, $4, escape_Qundef($5)) %*/
		    }
		| k_unless expr_value then
		  compstmt
		  opt_else
		  k_end
		    {
		    /*%%%*/
			$$ = new_unless(p, $2, $4, $5, &@$);
			fixpos($$, $2);
		    /*% %*/
		    /*% ripper: unless!($2, $4, escape_Qundef($5)) %*/
		    }
		| k_while expr_value_do
		  compstmt
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_WHILE(cond(p, $2, &@2), $3, 1, &@$);
			fixpos($$, $2);
		    /*% %*/
		    /*% ripper: while!($2, $3) %*/
		    }
		| k_until expr_value_do
		  compstmt
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_UNTIL(cond(p, $2, &@2), $3, 1, &@$);
			fixpos($$, $2);
		    /*% %*/
		    /*% ripper: until!($2, $3) %*/
		    }
		| k_case expr_value opt_terms
		    {
			$<val>$ = p->case_labels;
			p->case_labels = Qnil;
		    }
		  case_body
		  k_end
		    {
			if (RTEST(p->case_labels)) rb_hash_clear(p->case_labels);
			p->case_labels = $<val>4;
		    /*%%%*/
			$$ = NEW_CASE($2, $5, &@$);
			fixpos($$, $2);
		    /*% %*/
		    /*% ripper: case!($2, $5) %*/
		    }
		| k_case opt_terms
		    {
			$<val>$ = p->case_labels;
			p->case_labels = 0;
		    }
		  case_body
		  k_end
		    {
			if (RTEST(p->case_labels)) rb_hash_clear(p->case_labels);
			p->case_labels = $<val>3;
		    /*%%%*/
			$$ = NEW_CASE2($4, &@$);
		    /*% %*/
		    /*% ripper: case!(Qnil, $4) %*/
		    }
		| k_case expr_value opt_terms
		  p_case_body
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_CASE3($2, $4, &@$);
		    /*% %*/
		    /*% ripper: case!($2, $4) %*/
		    }
		| k_for for_var keyword_in expr_value_do
		  compstmt
		  k_end
		    {
		    /*%%%*/
			/*
			 *  for a, b, c in e
			 *  #=>
			 *  e.each{|*x| a, b, c = x}
			 *
			 *  for a in e
			 *  #=>
			 *  e.each{|x| a, = x}
			 */
			ID id = internal_id(p);
			NODE *m = NEW_ARGS_AUX(0, 0, &NULL_LOC);
			NODE *args, *scope, *internal_var = NEW_DVAR(id, &@2);
			ID *tbl = ALLOC_N(ID, 3);
			tbl[0] = 1 /* length of local var table */; tbl[1] = id /* internal id */;
                        rb_ast_add_local_table(p->ast, tbl);

			switch (nd_type($2)) {
			  case NODE_LASGN:
			  case NODE_DASGN:
			  case NODE_DASGN_CURR: /* e.each {|internal_var| a = internal_var; ... } */
			    $2->nd_value = internal_var;
			    id = 0;
			    m->nd_plen = 1;
			    m->nd_next = $2;
			    break;
			  case NODE_MASGN: /* e.each {|*internal_var| a, b, c = (internal_var.length == 1 && Array === (tmp = internal_var[0]) ? tmp : internal_var); ... } */
			    m->nd_next = node_assign(p, $2, NEW_FOR_MASGN(internal_var, &@2), NO_LEX_CTXT, &@2);
			    break;
			  default: /* e.each {|*internal_var| @a, B, c[1], d.attr = internal_val; ... } */
			    m->nd_next = node_assign(p, NEW_MASGN(NEW_LIST($2, &@2), 0, &@2), internal_var, NO_LEX_CTXT, &@2);
			}
			/* {|*internal_id| <m> = internal_id; ... } */
			args = new_args(p, m, 0, id, 0, new_args_tail(p, 0, 0, 0, &@2), &@2);
			scope = NEW_NODE(NODE_SCOPE, tbl, $5, args, &@$);
			$$ = NEW_FOR($4, scope, &@$);
			fixpos($$, $2);
		    /*% %*/
		    /*% ripper: for!($2, $4, $5) %*/
		    }
		| k_class cpath superclass
		    {
			if (p->ctxt.in_def) {
			    YYLTYPE loc = code_loc_gen(&@1, &@2);
			    yyerror1(&loc, "class definition in method body");
			}
			p->ctxt.in_class = 1;
			local_push(p, 0);
		    }
		  bodystmt
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_CLASS($2, $5, $3, &@$);
			nd_set_line($$->nd_body, @6.end_pos.lineno);
			set_line_body($5, @3.end_pos.lineno);
			nd_set_line($$, @3.end_pos.lineno);
		    /*% %*/
		    /*% ripper: class!($2, $3, $5) %*/
			local_pop(p);
			p->ctxt.in_class = $<ctxt>1.in_class;
			p->ctxt.shareable_constant_value = $<ctxt>1.shareable_constant_value;
		    }
		| k_class tLSHFT expr
		    {
			p->ctxt.in_def = 0;
			p->ctxt.in_class = 0;
			local_push(p, 0);
		    }
		  term
		  bodystmt
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_SCLASS($3, $6, &@$);
			nd_set_line($$->nd_body, @7.end_pos.lineno);
			set_line_body($6, nd_line($3));
			fixpos($$, $3);
		    /*% %*/
		    /*% ripper: sclass!($3, $6) %*/
			local_pop(p);
			p->ctxt.in_def = $<ctxt>1.in_def;
			p->ctxt.in_class = $<ctxt>1.in_class;
			p->ctxt.shareable_constant_value = $<ctxt>1.shareable_constant_value;
		    }
		| k_module cpath
		    {
			if (p->ctxt.in_def) {
			    YYLTYPE loc = code_loc_gen(&@1, &@2);
			    yyerror1(&loc, "module definition in method body");
			}
			p->ctxt.in_class = 1;
			local_push(p, 0);
		    }
		  bodystmt
		  k_end
		    {
		    /*%%%*/
			$$ = NEW_MODULE($2, $4, &@$);
			nd_set_line($$->nd_body, @5.end_pos.lineno);
			set_line_body($4, @2.end_pos.lineno);
			nd_set_line($$, @2.end_pos.lineno);
		    /*% %*/
		    /*% ripper: module!($2, $4) %*/
			local_pop(p);
			p->ctxt.in_class = $<ctxt>1.in_class;
			p->ctxt.shareable_constant_value = $<ctxt>1.shareable_constant_value;
		    }
		| defn_head
		  f_arglist
		  bodystmt
		  k_end
		    {
			restore_defun(p, $<node>1->nd_defn);
		    /*%%%*/
			$$ = set_defun_body(p, $1, $2, $3, &@$);
		    /*% %*/
		    /*% ripper: def!(get_value($1), $2, $3) %*/
			local_pop(p);
		    }
		| defs_head
		  f_arglist
		  bodystmt
		  k_end
		    {
			restore_defun(p, $<node>1->nd_defn);
		    /*%%%*/
			$$ = set_defun_body(p, $1, $2, $3, &@$);
		    /*%
			$1 = get_value($1);
		    %*/
		    /*% ripper: defs!(AREF($1, 0), AREF($1, 1), AREF($1, 2), $2, $3) %*/
			local_pop(p);
		    }
		| keyword_break
		    {
		    /*%%%*/
			$$ = NEW_BREAK(0, &@$);
		    /*% %*/
		    /*% ripper: break!(args_new!) %*/
		    }
		| keyword_next
		    {
		    /*%%%*/
			$$ = NEW_NEXT(0, &@$);
		    /*% %*/
		    /*% ripper: next!(args_new!) %*/
		    }
		| keyword_redo
		    {
		    /*%%%*/
			$$ = NEW_REDO(&@$);
		    /*% %*/
		    /*% ripper: redo! %*/
		    }
		| keyword_retry
		    {
		    /*%%%*/
			$$ = NEW_RETRY(&@$);
		    /*% %*/
		    /*% ripper: retry! %*/
		    }
		;

primary_value	: primary
		    {
			value_expr($1);
			$$ = $1;
		    }
		;

k_begin		: keyword_begin
		    {
			token_info_push(p, "begin", &@$);
		    }
		;

k_if		: keyword_if
		    {
			WARN_EOL("if");
			token_info_push(p, "if", &@$);
			if (p->token_info && p->token_info->nonspc &&
			    p->token_info->next && !strcmp(p->token_info->next->token, "else")) {
			    const char *tok = p->lex.ptok;
			    const char *beg = p->lex.pbeg + p->token_info->next->beg.column;
			    beg += rb_strlen_lit("else");
			    while (beg < tok && ISSPACE(*beg)) beg++;
			    if (beg == tok) {
				p->token_info->nonspc = 0;
			    }
			}
		    }
		;

k_unless	: keyword_unless
		    {
			token_info_push(p, "unless", &@$);
		    }
		;

k_while		: keyword_while
		    {
			token_info_push(p, "while", &@$);
		    }
		;

k_until		: keyword_until
		    {
			token_info_push(p, "until", &@$);
		    }
		;

k_case		: keyword_case
		    {
			token_info_push(p, "case", &@$);
		    }
		;

k_for		: keyword_for
		    {
			token_info_push(p, "for", &@$);
		    }
		;

k_class		: keyword_class
		    {
			token_info_push(p, "class", &@$);
			$<ctxt>$ = p->ctxt;
		    }
		;

k_module	: keyword_module
		    {
			token_info_push(p, "module", &@$);
			$<ctxt>$ = p->ctxt;
		    }
		;

k_def		: keyword_def
		    {
			token_info_push(p, "def", &@$);
		    }
		;

k_do		: keyword_do
		    {
			token_info_push(p, "do", &@$);
		    }
		;

k_do_block	: keyword_do_block
		    {
			token_info_push(p, "do", &@$);
		    }
		;

k_rescue	: keyword_rescue
		    {
			token_info_warn(p, "rescue", p->token_info, 1, &@$);
		    }
		;

k_ensure	: keyword_ensure
		    {
			token_info_warn(p, "ensure", p->token_info, 1, &@$);
		    }
		;

k_when		: keyword_when
		    {
			token_info_warn(p, "when", p->token_info, 0, &@$);
		    }
		;

k_else		: keyword_else
		    {
			token_info *ptinfo_beg = p->token_info;
			int same = ptinfo_beg && strcmp(ptinfo_beg->token, "case") != 0;
			token_info_warn(p, "else", p->token_info, same, &@$);
			if (same) {
			    token_info e;
			    e.next = ptinfo_beg->next;
			    e.token = "else";
			    token_info_setup(&e, p->lex.pbeg, &@$);
			    if (!e.nonspc) *ptinfo_beg = e;
			}
		    }
		;

k_elsif 	: keyword_elsif
		    {
			WARN_EOL("elsif");
			token_info_warn(p, "elsif", p->token_info, 1, &@$);
		    }
		;

k_end		: keyword_end
		    {
			token_info_pop(p, "end", &@$);
		    }
		;

k_return	: keyword_return
		    {
			if (p->ctxt.in_class && !p->ctxt.in_def && !dyna_in_block(p))
			    yyerror1(&@1, "Invalid return in class/module body");
		    }
		;

then		: term
		| keyword_then
		| term keyword_then
		;

do		: term
		| keyword_do_cond
		;

if_tail		: opt_else
		| k_elsif expr_value then
		  compstmt
		  if_tail
		    {
		    /*%%%*/
			$$ = new_if(p, $2, $4, $5, &@$);
			fixpos($$, $2);
		    /*% %*/
		    /*% ripper: elsif!($2, $4, escape_Qundef($5)) %*/
		    }
		;

opt_else	: none
		| k_else compstmt
		    {
		    /*%%%*/
			$$ = $2;
		    /*% %*/
		    /*% ripper: else!($2) %*/
		    }
		;

for_var		: lhs
		| mlhs
		;

f_marg		: f_norm_arg
		    {
		    /*%%%*/
			$$ = assignable(p, $1, 0, &@$);
			mark_lvar_used(p, $$);
		    /*% %*/
		    /*% ripper: assignable(p, $1) %*/
		    }
		| tLPAREN f_margs rparen
		    {
		    /*%%%*/
			$$ = $2;
		    /*% %*/
		    /*% ripper: mlhs_paren!($2) %*/
		    }
		;

f_marg_list	: f_marg
		    {
		    /*%%%*/
			$$ = NEW_LIST($1, &@$);
		    /*% %*/
		    /*% ripper: mlhs_add!(mlhs_new!, $1) %*/
		    }
		| f_marg_list ',' f_marg
		    {
		    /*%%%*/
			$$ = list_append(p, $1, $3);
		    /*% %*/
		    /*% ripper: mlhs_add!($1, $3) %*/
		    }
		;

f_margs		: f_marg_list
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, 0, &@$);
		    /*% %*/
		    /*% ripper: $1 %*/
		    }
		| f_marg_list ',' f_rest_marg
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, $3, &@$);
		    /*% %*/
		    /*% ripper: mlhs_add_star!($1, $3) %*/
		    }
		| f_marg_list ',' f_rest_marg ',' f_marg_list
		    {
		    /*%%%*/
			$$ = NEW_MASGN($1, NEW_POSTARG($3, $5, &@$), &@$);
		    /*% %*/
		    /*% ripper: mlhs_add_post!(mlhs_add_star!($1, $3), $5) %*/
		    }
		| f_rest_marg
		    {
		    /*%%%*/
			$$ = NEW_MASGN(0, $1, &@$);
		    /*% %*/
		    /*% ripper: mlhs_add_star!(mlhs_new!, $1) %*/
		    }
		| f_rest_marg ',' f_marg_list
		    {
		    /*%%%*/
			$$ = NEW_MASGN(0, NEW_POSTARG($1, $3, &@$), &@$);
		    /*% %*/
		    /*% ripper: mlhs_add_post!(mlhs_add_star!(mlhs_new!, $1), $3) %*/
		    }
		;

f_rest_marg	: tSTAR f_norm_arg
		    {
		    /*%%%*/
			$$ = assignable(p, $2, 0, &@$);
			mark_lvar_used(p, $$);
		    /*% %*/
		    /*% ripper: assignable(p, $2) %*/
		    }
		| tSTAR
		    {
		    /*%%%*/
			$$ = NODE_SPECIAL_NO_NAME_REST;
		    /*% %*/
		    /*% ripper: Qnil %*/
		    }
		;

f_any_kwrest	: f_kwrest
		| f_no_kwarg {$$ = ID2VAL(idNil);}
		;

block_args_tail	: f_block_kwarg ',' f_kwrest opt_f_block_arg
		    {
			$$ = new_args_tail(p, $1, $3, $4, &@3);
		    }
		| f_block_kwarg opt_f_block_arg
		    {
			$$ = new_args_tail(p, $1, Qnone, $2, &@1);
		    }
		| f_any_kwrest opt_f_block_arg
		    {
			$$ = new_args_tail(p, Qnone, $1, $2, &@1);
		    }
		| f_block_arg
		    {
			$$ = new_args_tail(p, Qnone, Qnone, $1, &@1);
		    }
		;

opt_block_args_tail : ',' block_args_tail
		    {
			$$ = $2;
		    }
		| /* none */
		    {
			$$ = new_args_tail(p, Qnone, Qnone, Qnone, &@0);
		    }
		;

excessed_comma	: ','
		    {
			/* magic number for rest_id in iseq_set_arguments() */
		    /*%%%*/
			$$ = NODE_SPECIAL_EXCESSIVE_COMMA;
		    /*% %*/
		    /*% ripper: excessed_comma! %*/
		    }
		;

block_param	: f_arg ',' f_block_optarg ',' f_rest_arg opt_block_args_tail
		    {
			$$ = new_args(p, $1, $3, $5, Qnone, $6, &@$);
		    }
		| f_arg ',' f_block_optarg ',' f_rest_arg ',' f_arg opt_block_args_tail
		    {
			$$ = new_args(p, $1, $3, $5, $7, $8, &@$);
		    }
		| f_arg ',' f_block_optarg opt_block_args_tail
		    {
			$$ = new_args(p, $1, $3, Qnone, Qnone, $4, &@$);
		    }
		| f_arg ',' f_block_optarg ',' f_arg opt_block_args_tail
		    {
			$$ = new_args(p, $1, $3, Qnone, $5, $6, &@$);
		    }
                | f_arg ',' f_rest_arg opt_block_args_tail
		    {
			$$ = new_args(p, $1, Qnone, $3, Qnone, $4, &@$);
		    }
		| f_arg excessed_comma
		    {
			$$ = new_args_tail(p, Qnone, Qnone, Qnone, &@2);
			$$ = new_args(p, $1, Qnone, $2, Qnone, $$, &@$);
		    }
		| f_arg ',' f_rest_arg ',' f_arg opt_block_args_tail
		    {
			$$ = new_args(p, $1, Qnone, $3, $5, $6, &@$);
		    }
		| f_arg opt_block_args_tail
		    {
			$$ = new_args(p, $1, Qnone, Qnone, Qnone, $2, &@$);
		    }
		| f_block_optarg ',' f_rest_arg opt_block_args_tail
		    {
			$$ = new_args(p, Qnone, $1, $3, Qnone, $4, &@$);
		    }
		| f_block_optarg ',' f_rest_arg ',' f_arg opt_block_args_tail
		    {
			$$ = new_args(p, Qnone, $1, $3, $5, $6, &@$);
		    }
		| f_block_optarg opt_block_args_tail
		    {
			$$ = new_args(p, Qnone, $1, Qnone, Qnone, $2, &@$);
		    }
		| f_block_optarg ',' f_arg opt_block_args_tail
		    {
			$$ = new_args(p, Qnone, $1, Qnone, $3, $4, &@$);
		    }
		| f_rest_arg opt_block_args_tail
		    {
			$$ = new_args(p, Qnone, Qnone, $1, Qnone, $2, &@$);
		    }
		| f_rest_arg ',' f_arg opt_block_args_tail
		    {
			$$ = new_args(p, Qnone, Qnone, $1, $3, $4, &@$);
		    }
		| block_args_tail
		    {
			$$ = new_args(p, Qnone, Qnone, Qnone, Qnone, $1, &@$);
		    }
		;

opt_block_param	: none
		| block_param_def
		    {
			p->command_start = TRUE;
		    }
		;

block_param_def	: '|' opt_bv_decl '|'
		    {
			p->cur_arg = 0;
			p->max_numparam = ORDINAL_PARAM;
		    /*%%%*/
			$$ = 0;
		    /*% %*/
		    /*% ripper: block_var!(params!(Qnil,Qnil,Qnil,Qnil,Qnil,Qnil,Qnil), escape_Qundef($2)) %*/
		    }
		| '|' block_param opt_bv_decl '|'
		    {
			p->cur_arg = 0;
			p->max_numparam = ORDINAL_PARAM;
		    /*%%%*/
			$$ = $2;
		    /*% %*/
		    /*% ripper: block_var!(escape_Qundef($2), escape_Qundef($3)) %*/
		    }
		;


opt_bv_decl	: opt_nl
		    {
		      $$ = 0;
		    }
		| opt_nl ';' bv_decls opt_nl
		    {
		    /*%%%*/
			$$ = 0;
		    /*% %*/
		    /*% ripper: $3 %*/
		    }
		;

bv_decls	: bvar
		    /*% ripper[brace]: rb_ary_new3(1, get_value($1)) %*/
		| bv_decls ',' bvar
		    /*% ripper[brace]: rb_ary_push($1, get_value($3)) %*/
		;

bvar		: tIDENTIFIER
		    {
			new_bv(p, get_id($1));
		    /*% ripper: get_value($1) %*/
		    }
		| f_bad_arg
		    {
			$$ = 0;
		    }
		;

lambda		: tLAMBDA
		    {
			token_info_push(p, "->", &@1);
			$<vars>1 = dyna_push(p);
			$<num>$ = p->lex.lpar_beg;
			p->lex.lpar_beg = p->lex.paren_nest;
		    }
		    {
			$<num>$ = p->max_numparam;
			p->max_numparam = 0;
		    }
		    {
			$<node>$ = numparam_push(p);
		    }
		  f_larglist
		    {
			CMDARG_PUSH(0);
		    }
		  lambda_body
		    {
			int max_numparam = p->max_numparam;
			p->lex.lpar_beg = $<num>2;
			p->max_numparam = $<num>3;
			CMDARG_POP();
			$5 = args_with_numbered(p, $5, max_numparam);
		    /*%%%*/
                        {
                            YYLTYPE loc = code_loc_gen(&@5, &@7);
                            $$ = NEW_LAMBDA($5, $7, &loc);
                            nd_set_line($$->nd_body, @7.end_pos.lineno);
                            nd_set_line($$, @5.end_pos.lineno);
			    nd_set_first_loc($$, @1.beg_pos);
                        }
		    /*% %*/
		    /*% ripper: lambda!($5, $7) %*/
			numparam_pop(p, $<node>4);
			dyna_pop(p, $<vars>1);
		    }
		;

f_larglist	: '(' f_args opt_bv_decl ')'
		    {
		    /*%%%*/
			$$ = $2;
			p->max_numparam = ORDINAL_PARAM;
		    /*% %*/
		    /*% ripper: paren!($2) %*/
		    }
		| f_args
		    {
		    /*%%%*/
			if (!args_info_empty_p($1->nd_ainfo))
			    p->max_numparam = ORDINAL_PARAM;
		    /*% %*/
			$$ = $1;
		    }
		;

lambda_body	: tLAMBEG compstmt '}'
		    {
			token_info_pop(p, "}", &@3);
			$$ = $2;
		    }
		| keyword_do_LAMBDA bodystmt k_end
		    {
			$$ = $2;
		    }
		;

do_block	: k_do_block do_body k_end
		    {
			$$ = $2;
		    /*%%%*/
			$$->nd_body->nd_loc = code_loc_gen(&@1, &@3);
			nd_set_line($$, @1.end_pos.lineno);
		    /*% %*/
		    }
		;

block_call	: command do_block
		    {
		    /*%%%*/
			if (nd_type($1) == NODE_YIELD) {
			    compile_error(p, "block given to yield");
			}
			else {
			    block_dup_check(p, $1->nd_args, $2);
			}
			$$ = method_add_block(p, $1, $2, &@$);
			fixpos($$, $1);
		    /*% %*/
		    /*% ripper: method_add_block!($1, $2) %*/
		    }
		| block_call call_op2 operation2 opt_paren_args
		    {
		    /*%%%*/
			$$ = new_qcall(p, $2, $1, $3, $4, &@3, &@$);
		    /*% %*/
		    /*% ripper: opt_event(:method_add_arg!, call!($1, $2, $3), $4) %*/
		    }
		| block_call call_op2 operation2 opt_paren_args brace_block
		    {
		    /*%%%*/
			$$ = new_command_qcall(p, $2, $1, $3, $4, $5, &@3, &@$);
		    /*% %*/
		    /*% ripper: opt_event(:method_add_block!, command_call!($1, $2, $3, $4), $5) %*/
		    }
		| block_call call_op2 operation2 command_args do_block
		    {
		    /*%%%*/
			$$ = new_command_qcall(p, $2, $1, $3, $4, $5, &@3, &@$);
		    /*% %*/
		    /*% ripper: method_add_block!(command_call!($1, $2, $3, $4), $5) %*/
		    }
		;

method_call	: fcall paren_args
		    {
		    /*%%%*/
			$$ = $1;
			$$->nd_args = $2;
			nd_set_last_loc($1, @2.end_pos);
		    /*% %*/
		    /*% ripper: method_add_arg!(fcall!($1), $2) %*/
		    }
		| primary_value call_op operation2 opt_paren_args
		    {
		    /*%%%*/
			$$ = new_qcall(p, $2, $1, $3, $4, &@3, &@$);
			nd_set_line($$, @3.end_pos.lineno);
		    /*% %*/
		    /*% ripper: opt_event(:method_add_arg!, call!($1, $2, $3), $4) %*/
		    }
		| primary_value tCOLON2 operation2 paren_args
		    {
		    /*%%%*/
			$$ = new_qcall(p, ID2VAL(idCOLON2), $1, $3, $4, &@3, &@$);
			nd_set_line($$, @3.end_pos.lineno);
		    /*% %*/
		    /*% ripper: method_add_arg!(call!($1, ID2VAL(idCOLON2), $3), $4) %*/
		    }
		| primary_value tCOLON2 operation3
		    {
		    /*%%%*/
			$$ = new_qcall(p, ID2VAL(idCOLON2), $1, $3, Qnull, &@3, &@$);
		    /*% %*/
		    /*% ripper: call!($1, ID2VAL(idCOLON2), $3) %*/
		    }
		| primary_value call_op paren_args
		    {
		    /*%%%*/
			$$ = new_qcall(p, $2, $1, ID2VAL(idCall), $3, &@2, &@$);
			nd_set_line($$, @2.end_pos.lineno);
		    /*% %*/
		    /*% ripper: method_add_arg!(call!($1, $2, ID2VAL(idCall)), $3) %*/
		    }
		| primary_value tCOLON2 paren_args
		    {
		    /*%%%*/
			$$ = new_qcall(p, ID2VAL(idCOLON2), $1, ID2VAL(idCall), $3, &@2, &@$);
			nd_set_line($$, @2.end_pos.lineno);
		    /*% %*/
		    /*% ripper: method_add_arg!(call!($1, ID2VAL(idCOLON2), ID2VAL(idCall)), $3) %*/
		    }
		| keyword_super paren_args
		    {
		    /*%%%*/
			$$ = NEW_SUPER($2, &@$);
		    /*% %*/
		    /*% ripper: super!($2) %*/
		    }
		| keyword_super
		    {
		    /*%%%*/
			$$ = NEW_ZSUPER(&@$);
		    /*% %*/
		    /*% ripper: zsuper! %*/
		    }
		| primary_value '[' opt_call_args rbracket
		    {
		    /*%%%*/
			if ($1 && nd_type($1) == NODE_SELF)
			    $$ = NEW_FCALL(tAREF, $3, &@$);
			else
			    $$ = NEW_CALL($1, tAREF, $3, &@$);
			fixpos($$, $1);
		    /*% %*/
		    /*% ripper: aref!($1, escape_Qundef($3)) %*/
		    }
		;

brace_block	: '{' brace_body '}'
		    {
			$$ = $2;
		    /*%%%*/
			$$->nd_body->nd_loc = code_loc_gen(&@1, &@3);
			nd_set_line($$, @1.end_pos.lineno);
		    /*% %*/
		    }
		| k_do do_body k_end
		    {
			$$ = $2;
		    /*%%%*/
			$$->nd_body->nd_loc = code_loc_gen(&@1, &@3);
			nd_set_line($$, @1.end_pos.lineno);
		    /*% %*/
		    }
		;

brace_body	: {$<vars>$ = dyna_push(p);}
		    {
			$<num>$ = p->max_numparam;
			p->max_numparam = 0;
		    }
		    {
			$<node>$ = numparam_push(p);
		    }
		  opt_block_param compstmt
		    {
			int max_numparam = p->max_numparam;
			p->max_numparam = $<num>2;
			$4 = args_with_numbered(p, $4, max_numparam);
		    /*%%%*/
			$$ = NEW_ITER($4, $5, &@$);
		    /*% %*/
		    /*% ripper: brace_block!(escape_Qundef($4), $5) %*/
			numparam_pop(p, $<node>3);
			dyna_pop(p, $<vars>1);
		    }
		;

do_body 	: {$<vars>$ = dyna_push(p);}
		    {
			$<num>$ = p->max_numparam;
			p->max_numparam = 0;
		    }
		    {
			$<node>$ = numparam_push(p);
			CMDARG_PUSH(0);
		    }
		  opt_block_param bodystmt
		    {
			int max_numparam = p->max_numparam;
			p->max_numparam = $<num>2;
			$4 = args_with_numbered(p, $4, max_numparam);
		    /*%%%*/
			$$ = NEW_ITER($4, $5, &@$);
		    /*% %*/
		    /*% ripper: do_block!(escape_Qundef($4), $5) %*/
			CMDARG_POP();
			numparam_pop(p, $<node>3);
			dyna_pop(p, $<vars>1);
		    }
		;

case_args	: arg_value
		    {
		    /*%%%*/
			check_literal_when(p, $1, &@1);
			$$ = NEW_LIST($1, &@$);
		    /*% %*/
		    /*% ripper: args_add!(args_new!, $1) %*/
		    }
		| tSTAR arg_value
		    {
		    /*%%%*/
			$$ = NEW_SPLAT($2, &@$);
		    /*% %*/
		    /*% ripper: args_add_star!(args_new!, $2) %*/
		    }
		| case_args ',' arg_value
		    {
		    /*%%%*/
			check_literal_when(p, $3, &@3);
			$$ = last_arg_append(p, $1, $3, &@$);
		    /*% %*/
		    /*% ripper: args_add!($1, $3) %*/
		    }
		| case_args ',' tSTAR arg_value
		    {
		    /*%%%*/
			$$ = rest_arg_append(p, $1, $4, &@$);
		    /*% %*/
		    /*% ripper: args_add_star!($1, $4) %*/
		    }
		;

case_body	: k_when case_args then
		  compstmt
		  cases
		    {
		    /*%%%*/
			$$ = NEW_WHEN($2, $4, $5, &@$);
			fixpos($$, $2);
		    /*% %*/
		    /*% ripper: when!($2, $4, escape_Qundef($5)) %*/
		    }
		;

cases		: opt_else
		| case_body
		;

p_case_body	: keyword_in
		    {
			SET_LEX_STATE(EXPR_BEG|EXPR_LABEL);
			p->command_start = FALSE;
			$<ctxt>1 = p->ctxt;
			p->ctxt.in_kwarg = 1;
			$<tbl>$ = push_pvtbl(p);
		    }
		    {
			$<tbl>$ = push_pktbl(p);
		    }
		  p_top_expr then
		    {
			pop_pktbl(p, $<tbl>3);
			pop_pvtbl(p, $<tbl>2);
			p->ctxt.in_kwarg = $<ctxt>1.in_kwarg;
		    }
		  compstmt
		  p_cases
		    {
		    /*%%%*/
			$$ = NEW_IN($4, $7, $8, &@$);
		    /*% %*/
		    /*% ripper: in!($4, $7, escape_Qundef($8)) %*/
		    }
		;

p_cases 	: opt_else
		| p_case_body
		;

p_top_expr	: p_top_expr_body
		| p_top_expr_body modifier_if expr_value
		    {
		    /*%%%*/
			$$ = new_if(p, $3, remove_begin($1), 0, &@$);
			fixpos($$, $3);
		    /*% %*/
		    /*% ripper: if_mod!($3, $1) %*/
		    }
		| p_top_expr_body modifier_unless expr_value
		    {
		    /*%%%*/
			$$ = new_unless(p, $3, remove_begin($1), 0, &@$);
			fixpos($$, $3);
		    /*% %*/
		    /*% ripper: unless_mod!($3, $1) %*/
		    }
		;

p_top_expr_body : p_expr
		| p_expr ','
		    {
			$$ = new_array_pattern_tail(p, Qnone, 1, 0, Qnone, &@$);
			$$ = new_array_pattern(p, Qnone, get_value($1), $$, &@$);
		    }
		| p_expr ',' p_args
		    {
			$$ = new_array_pattern(p, Qnone, get_value($1), $3, &@$);
		    /*%%%*/
			nd_set_first_loc($$, @1.beg_pos);
		    /*%
		    %*/
		    }
		| p_find
		    {
			$$ = new_find_pattern(p, Qnone, $1, &@$);
		    }
		| p_args_tail
		    {
			$$ = new_array_pattern(p, Qnone, Qnone, $1, &@$);
		    }
		| p_kwargs
		    {
			$$ = new_hash_pattern(p, Qnone, $1, &@$);
		    }
		;

p_expr		: p_as
		;

p_as		: p_expr tASSOC p_variable
		    {
		    /*%%%*/
			NODE *n = NEW_LIST($1, &@$);
			n = list_append(p, n, $3);
			$$ = new_hash(p, n, &@$);
		    /*% %*/
		    /*% ripper: binary!($1, STATIC_ID2SYM((id_assoc)), $3) %*/
		    }
		| p_alt
		;

p_alt		: p_alt '|' p_expr_basic
		    {
		    /*%%%*/
			$$ = NEW_NODE(NODE_OR, $1, $3, 0, &@$);
		    /*% %*/
		    /*% ripper: binary!($1, STATIC_ID2SYM(idOr), $3) %*/
		    }
		| p_expr_basic
		;

p_lparen	: '(' {$<tbl>$ = push_pktbl(p);};
p_lbracket	: '[' {$<tbl>$ = push_pktbl(p);};

p_expr_basic	: p_value
		| p_const p_lparen p_args rparen
		    {
			pop_pktbl(p, $<tbl>2);
			$$ = new_array_pattern(p, $1, Qnone, $3, &@$);
		    /*%%%*/
			nd_set_first_loc($$, @1.beg_pos);
		    /*%
		    %*/
		    }
		| p_const p_lparen p_find rparen
		    {
			pop_pktbl(p, $<tbl>2);
			$$ = new_find_pattern(p, $1, $3, &@$);
		    /*%%%*/
			nd_set_first_loc($$, @1.beg_pos);
		    /*%
		    %*/
		    }
		| p_const p_lparen p_kwargs rparen
		    {
			pop_pktbl(p, $<tbl>2);
			$$ = new_hash_pattern(p, $1, $3, &@$);
		    /*%%%*/
			nd_set_first_loc($$, @1.beg_pos);
		    /*%
		    %*/
		    }
		| p_const '(' rparen
		    {
			$$ = new_array_pattern_tail(p, Qnone, 0, 0, Qnone, &@$);
			$$ = new_array_pattern(p, $1, Qnone, $$, &@$);
		    }
		| p_const p_lbracket p_args rbracket
		    {
			pop_pktbl(p, $<tbl>2);
			$$ = new_array_pattern(p, $1, Qnone, $3, &@$);
		    /*%%%*/
			nd_set_first_loc($$, @1.beg_pos);
		    /*%
		    %*/
		    }
		| p_const p_lbracket p_find rbracket
		    {
			pop_pktbl(p, $<tbl>2);
			$$ = new_find_pattern(p, $1, $3, &@$);
		    /*%%%*/
			nd_set_first_loc($$, @1.beg_pos);
		    /*%
		    %*/
		    }
		| p_const p_lbracket p_kwargs rbracket
		    {
			pop_pktbl(p, $<tbl>2);
			$$ = new_hash_pattern(p, $1, $3, &@$);
		    /*%%%*/
			nd_set_first_loc($$, @1.beg_pos);
		    /*%
		    %*/
		    }
		| p_const '[' rbracket
		    {
			$$ = new_array_pattern_tail(p, Qnone, 0, 0, Qnone, &@$);
			$$ = new_array_pattern(p, $1, Qnone, $$, &@$);
		    }
		| tLBRACK p_args rbracket
		    {
			$$ = new_array_pattern(p, Qnone, Qnone, $2, &@$);
		    }
		| tLBRACK p_find rbracket
		    {
			$$ = new_find_pattern(p, Qnone, $2, &@$);
		    }
		| tLBRACK rbracket
		    {
			$$ = new_array_pattern_tail(p, Qnone, 0, 0, Qnone, &@$);
			$$ = new_array_pattern(p, Qnone, Qnone, $$, &@$);
		    }
		| tLBRACE
		    {
			$<tbl>$ = push_pktbl(p);
			$<ctxt>1 = p->ctxt;
			p->ctxt.in_kwarg = 0;
		    }
		  p_kwargs rbrace
		    {
			pop_pktbl(p, $<tbl>2);
			p->ctxt.in_kwarg = $<ctxt>1.in_kwarg;
			$$ = new_hash_pattern(p, Qnone, $3, &@$);
		    }
		| tLBRACE rbrace
		    {
			$$ = new_hash_pattern_tail(p, Qnone, 0, &@$);
			$$ = new_hash_pattern(p, Qnone, $$, &@$);
		    }
		| tLPAREN {$<tbl>$ = push_pktbl(p);} p_expr rparen
		    {
			pop_pktbl(p, $<tbl>2);
			$$ = $3;
		    }
		;

p_args		: p_expr
		    {
		    /*%%%*/
			NODE *pre_args = NEW_LIST($1, &@$);
			$$ = new_array_pattern_tail(p, pre_args, 0, 0, Qnone, &@$);
		    /*%
			$$ = new_array_pattern_tail(p, rb_ary_new_from_args(1, get_value($1)), 0, 0, Qnone, &@$);
		    %*/
		    }
		| p_args_head
		    {
			$$ = new_array_pattern_tail(p, $1, 1, 0, Qnone, &@$);
		    }
		| p_args_head p_arg
		    {
		    /*%%%*/
			$$ = new_array_pattern_tail(p, list_concat($1, $2), 0, 0, Qnone, &@$);
		    /*%
			VALUE pre_args = rb_ary_concat($1, get_value($2));
			$$ = new_array_pattern_tail(p, pre_args, 0, 0, Qnone, &@$);
		    %*/
		    }
		| p_args_head tSTAR tIDENTIFIER
		    {
			$$ = new_array_pattern_tail(p, $1, 1, $3, Qnone, &@$);
		    }
		| p_args_head tSTAR tIDENTIFIER ',' p_args_post
		    {
			$$ = new_array_pattern_tail(p, $1, 1, $3, $5, &@$);
		    }
		| p_args_head tSTAR
		    {
			$$ = new_array_pattern_tail(p, $1, 1, 0, Qnone, &@$);
		    }
		| p_args_head tSTAR ',' p_args_post
		    {
			$$ = new_array_pattern_tail(p, $1, 1, 0, $4, &@$);
		    }
		| p_args_tail
		;

p_args_head	: p_arg ','
		    {
			$$ = $1;
		    }
		| p_args_head p_arg ','
		    {
		    /*%%%*/
			$$ = list_concat($1, $2);
		    /*% %*/
		    /*% ripper: rb_ary_concat($1, get_value($2)) %*/
		    }
		;

p_args_tail	: p_rest
		    {
			$$ = new_array_pattern_tail(p, Qnone, 1, $1, Qnone, &@$);
		    }
		| p_rest ',' p_args_post
		    {
			$$ = new_array_pattern_tail(p, Qnone, 1, $1, $3, &@$);
		    }
		;

p_find		: p_rest ',' p_args_post ',' p_rest
		    {
			$$ = new_find_pattern_tail(p, $1, $3, $5, &@$);

			if (rb_warning_category_enabled_p(RB_WARN_CATEGORY_EXPERIMENTAL))
			    rb_warn0L(nd_line($$), "Find pattern is experimental, and the behavior may change in future versions of Ruby!");
		    }
		;


p_rest		: tSTAR tIDENTIFIER
		    {
			$$ = $2;
		    }
		| tSTAR
		    {
			$$ = 0;
		    }
		;

p_args_post	: p_arg
		| p_args_post ',' p_arg
		    {
		    /*%%%*/
			$$ = list_concat($1, $3);
		    /*% %*/
		    /*% ripper: rb_ary_concat($1, get_value($3)) %*/
		    }
		;

p_arg		: p_expr
		    {
		    /*%%%*/
			$$ = NEW_LIST($1, &@$);
		    /*% %*/
		    /*% ripper: rb_ary_new_from_args(1, get_value($1)) %*/
		    }
		;

p_kwargs	: p_kwarg ',' p_any_kwrest
		    {
			$$ =  new_hash_pattern_tail(p, new_unique_key_hash(p, $1, &@$), $3, &@$);
		    }
		| p_kwarg
		    {
			$$ =  new_hash_pattern_tail(p, new_unique_key_hash(p, $1, &@$), 0, &@$);
		    }
		| p_kwarg ','
		    {
			$$ =  new_hash_pattern_tail(p, new_unique_key_hash(p, $1, &@$), 0, &@$);
		    }
		| p_any_kwrest
		    {
			$$ =  new_hash_pattern_tail(p, new_hash(p, Qnone, &@$), $1, &@$);
		    }
		;

p_kwarg 	: p_kw
		    /*% ripper[brace]: rb_ary_new_from_args(1, $1) %*/
		| p_kwarg ',' p_kw
		    {
		    /*%%%*/
			$$ = list_concat($1, $3);
		    /*% %*/
		    /*% ripper: rb_ary_push($1, $3) %*/
		    }
		;

p_kw		: p_kw_label p_expr
		    {
			error_duplicate_pattern_key(p, get_id($1), &@1);
		    /*%%%*/
			$$ = list_append(p, NEW_LIST(NEW_LIT(ID2SYM($1), &@$), &@$), $2);
		    /*% %*/
		    /*% ripper: rb_ary_new_from_args(2, get_value($1), get_value($2)) %*/
		    }
		| p_kw_label
		    {
			error_duplicate_pattern_key(p, get_id($1), &@1);
			if ($1 && !is_local_id(get_id($1))) {
			    yyerror1(&@1, "key must be valid as local variables");
			}
			error_duplicate_pattern_variable(p, get_id($1), &@1);
		    /*%%%*/
			$$ = list_append(p, NEW_LIST(NEW_LIT(ID2SYM($1), &@$), &@$), assignable(p, $1, 0, &@$));
		    /*% %*/
		    /*% ripper: rb_ary_new_from_args(2, get_value($1), Qnil) %*/
		    }
		;

p_kw_label	: tLABEL
		| tSTRING_BEG string_contents tLABEL_END
		    {
			YYLTYPE loc = code_loc_gen(&@1, &@3);
		    /*%%%*/
			if (!$2 || nd_type($2) == NODE_STR) {
			    NODE *node = dsym_node(p, $2, &loc);
			    $$ = SYM2ID(node->nd_lit);
			}
		    /*%
			if (ripper_is_node_yylval($2) && RNODE($2)->nd_cval) {
			    VALUE label = RNODE($2)->nd_cval;
			    VALUE rval = RNODE($2)->nd_rval;
			    $$ = ripper_new_yylval(p, rb_intern_str(label), rval, label);
			    RNODE($$)->nd_loc = loc;
			}
		    %*/
			else {
			    yyerror1(&loc, "symbol literal with interpolation is not allowed");
			    $$ = 0;
			}
		    }
		;

p_kwrest	: kwrest_mark tIDENTIFIER
		    {
		        $$ = $2;
		    }
		| kwrest_mark
		    {
		        $$ = 0;
		    }
		;

p_kwnorest	: kwrest_mark keyword_nil
		    {
		        $$ = 0;
		    }
		;

p_any_kwrest	: p_kwrest
		| p_kwnorest {$$ = ID2VAL(idNil);}
		;

p_value 	: p_primitive
		| p_primitive tDOT2 p_primitive
		    {
		    /*%%%*/
			value_expr($1);
			value_expr($3);
			$$ = NEW_DOT2($1, $3, &@$);
		    /*% %*/
		    /*% ripper: dot2!($1, $3) %*/
		    }
		| p_primitive tDOT3 p_primitive
		    {
		    /*%%%*/
			value_expr($1);
			value_expr($3);
			$$ = NEW_DOT3($1, $3, &@$);
		    /*% %*/
		    /*% ripper: dot3!($1, $3) %*/
		    }
		| p_primitive tDOT2
		    {
		    /*%%%*/
			value_expr($1);
			$$ = NEW_DOT2($1, new_nil_at(p, &@2.end_pos), &@$);
		    /*% %*/
		    /*% ripper: dot2!($1, Qnil) %*/
		    }
		| p_primitive tDOT3
		    {
		    /*%%%*/
			value_expr($1);
			$$ = NEW_DOT3($1, new_nil_at(p, &@2.end_pos), &@$);
		    /*% %*/
		    /*% ripper: dot3!($1, Qnil) %*/
		    }
		| p_variable
		| p_var_ref
		| p_const
		| tBDOT2 p_primitive
		    {
		    /*%%%*/
			value_expr($2);
			$$ = NEW_DOT2(new_nil_at(p, &@1.beg_pos), $2, &@$);
		    /*% %*/
		    /*% ripper: dot2!(Qnil, $2) %*/
		    }
		| tBDOT3 p_primitive
		    {
		    /*%%%*/
			value_expr($2);
			$$ = NEW_DOT3(new_nil_at(p, &@1.beg_pos), $2, &@$);
		    /*% %*/
		    /*% ripper: dot3!(Qnil, $2) %*/
		    }
		;

p_primitive	: literal
		| strings
		| xstring
		| regexp
		| words
		| qwords
		| symbols
		| qsymbols
		| keyword_variable
		    {
		    /*%%%*/
			if (!($$ = gettable(p, $1, &@$))) $$ = NEW_BEGIN(0, &@$);
		    /*% %*/
		    /*% ripper: var_ref!($1) %*/
		    }
		| lambda
		;

p_variable	: tIDENTIFIER
		    {
		    /*%%%*/
			error_duplicate_pattern_variable(p, $1, &@1);
			$$ = assignable(p, $1, 0, &@$);
		    /*% %*/
		    /*% ripper: assignable(p, var_field(p, $1)) %*/
		    }
		;

p_var_ref	: '^' tIDENTIFIER
		    {
		    /*%%%*/
			NODE *n = gettable(p, $2, &@$);
			if (!(nd_type(n) == NODE_LVAR || nd_type(n) == NODE_DVAR)) {
			    compile_error(p, "%"PRIsVALUE": no such local variable", rb_id2str($2));
			}
			$$ = n;
		    /*% %*/
		    /*% ripper: var_ref!($2) %*/
		    }
		;

p_const 	: tCOLON3 cname
		    {
		    /*%%%*/
			$$ = NEW_COLON3($2, &@$);
		    /*% %*/
		    /*% ripper: top_const_ref!($2) %*/
		    }
		| p_const tCOLON2 cname
		    {
		    /*%%%*/
			$$ = NEW_COLON2($1, $3, &@$);
		    /*% %*/
		    /*% ripper: const_path_ref!($1, $3) %*/
		    }
		| tCONSTANT
		   {
		    /*%%%*/
			$$ = gettable(p, $1, &@$);
		    /*% %*/
		    /*% ripper: var_ref!($1) %*/
		   }
		;

opt_rescue	: k_rescue exc_list exc_var then
		  compstmt
		  opt_rescue
		    {
		    /*%%%*/
			$$ = NEW_RESBODY($2,
					 $3 ? block_append(p, node_assign(p, $3, NEW_ERRINFO(&@3), NO_LEX_CTXT, &@3), $5) : $5,
					 $6, &@$);
			fixpos($$, $2?$2:$5);
		    /*% %*/
		    /*% ripper: rescue!(escape_Qundef($2), escape_Qundef($3), escape_Qundef($5), escape_Qundef($6)) %*/
		    }
		| none
		;

exc_list	: arg_value
		    {
		    /*%%%*/
			$$ = NEW_LIST($1, &@$);
		    /*% %*/
		    /*% ripper: rb_ary_new3(1, get_value($1)) %*/
		    }
		| mrhs
		    {
		    /*%%%*/
			if (!($$ = splat_array($1))) $$ = $1;
		    /*% %*/
		    /*% ripper: $1 %*/
		    }
		| none
		;

exc_var		: tASSOC lhs
		    {
			$$ = $2;
		    }
		| none
		;

opt_ensure	: k_ensure compstmt
		    {
		    /*%%%*/
			$$ = $2;
		    /*% %*/
		    /*% ripper: ensure!($2) %*/
		    }
		| none
		;

literal		: numeric
		| symbol
		;

strings		: string
		    {
		    /*%%%*/
			NODE *node = $1;
			if (!node) {
			    node = NEW_STR(STR_NEW0(), &@$);
                            RB_OBJ_WRITTEN(p->ast, Qnil, node->nd_lit);
			}
			else {
			    node = evstr2dstr(p, node);
			}
			$$ = node;
		    /*% %*/
		    /*% ripper: $1 %*/
		    }
		;

string		: tCHAR
		| string1
		| string string1
		    {
		    /*%%%*/
			$$ = literal_concat(p, $1, $2, &@$);
		    /*% %*/
		    /*% ripper: string_concat!($1, $2) %*/
		    }
		;

string1		: tSTRING_BEG string_contents tSTRING_END
		    {
		    /*%%%*/
			$$ = heredoc_dedent(p, $2);
			if ($$) nd_set_loc($$, &@$);
		    /*% %*/
		    /*% ripper: string_literal!(heredoc_dedent(p, $2)) %*/
		    }
		;

xstring		: tXSTRING_BEG xstring_contents tSTRING_END
		    {
		    /*%%%*/
			$$ = new_xstring(p, heredoc_dedent(p, $2), &@$);
		    /*% %*/
		    /*% ripper: xstring_literal!(heredoc_dedent(p, $2)) %*/
		    }
		;

regexp		: tREGEXP_BEG regexp_contents tREGEXP_END
		    {
			$$ = new_regexp(p, $2, $3, &@$);
		    }
		;

words		: tWORDS_BEG ' ' word_list tSTRING_END
		    {
		    /*%%%*/
			$$ = make_list($3, &@$);
		    /*% %*/
		    /*% ripper: array!($3) %*/
		    }
		;

word_list	: /* none */
		    {
		    /*%%%*/
			$$ = 0;
		    /*% %*/
		    /*% ripper: words_new! %*/
		    }
		| word_list word ' '
		    {
		    /*%%%*/
			$$ = list_append(p, $1, evstr2dstr(p, $2));
		    /*% %*/
		    /*% ripper: words_add!($1, $2) %*/
		    }
		;

word		: string_content
		    /*% ripper[brace]: word_add!(word_new!, $1) %*/
		| word string_content
		    {
		    /*%%%*/
			$$ = literal_concat(p, $1, $2, &@$);
		    /*% %*/
		    /*% ripper: word_add!($1, $2) %*/
		    }
		;

symbols 	: tSYMBOLS_BEG ' ' symbol_list tSTRING_END
		    {
		    /*%%%*/
			$$ = make_list($3, &@$);
		    /*% %*/
		    /*% ripper: array!($3) %*/
		    }
		;

symbol_list	: /* none */
		    {
		    /*%%%*/
			$$ = 0;
		    /*% %*/
		    /*% ripper: symbols_new! %*/
		    }
		| symbol_list word ' '
		    {
		    /*%%%*/
			$$ = symbol_append(p, $1, evstr2dstr(p, $2));
		    /*% %*/
		    /*% ripper: symbols_add!($1, $2) %*/
		    }
		;

qwords		: tQWORDS_BEG ' ' qword_list tSTRING_END
		    {
		    /*%%%*/
			$$ = make_list($3, &@$);
		    /*% %*/
		    /*% ripper: array!($3) %*/
		    }
		;

qsymbols	: tQSYMBOLS_BEG ' ' qsym_list tSTRING_END
		    {
		    /*%%%*/
			$$ = make_list($3, &@$);
		    /*% %*/
		    /*% ripper: array!($3) %*/
		    }
		;

qword_list	: /* none */
		    {
		    /*%%%*/
			$$ = 0;
		    /*% %*/
		    /*% ripper: qwords_new! %*/
		    }
		| qword_list tSTRING_CONTENT ' '
		    {
		    /*%%%*/
			$$ = list_append(p, $1, $2);
		    /*% %*/
		    /*% ripper: qwords_add!($1, $2) %*/
		    }
		;

qsym_list	: /* none */
		    {
		    /*%%%*/
			$$ = 0;
		    /*% %*/
		    /*% ripper: qsymbols_new! %*/
		    }
		| qsym_list tSTRING_CONTENT ' '
		    {
		    /*%%%*/
			$$ = symbol_append(p, $1, $2);
		    /*% %*/
		    /*% ripper: qsymbols_add!($1, $2) %*/
		    }
		;

string_contents : /* none */
		    {
		    /*%%%*/
			$$ = 0;
		    /*% %*/
		    /*% ripper: string_content! %*/
		    /*%%%*/
		    /*%
			$$ = ripper_new_yylval(p, 0, $$, 0);
		    %*/
		    }
		| string_contents string_content
		    {
		    /*%%%*/
			$$ = literal_concat(p, $1, $2, &@$);
		    /*% %*/
		    /*% ripper: string_add!($1, $2) %*/
		    /*%%%*/
		    /*%
			if (ripper_is_node_yylval($1) && ripper_is_node_yylval($2) &&
			    !RNODE($1)->nd_cval) {
			    RNODE($1)->nd_cval = RNODE($2)->nd_cval;
			    RNODE($1)->nd_rval = add_mark_object(p, $$);
			    $$ = $1;
			}
		    %*/
		    }
		;

xstring_contents: /* none */
		    {
		    /*%%%*/
			$$ = 0;
		    /*% %*/
		    /*% ripper: xstring_new! %*/
		    }
		| xstring_contents string_content
		    {
		    /*%%%*/
			$$ = literal_concat(p, $1, $2, &@$);
		    /*% %*/
		    /*% ripper: xstring_add!($1, $2) %*/
		    }
		;

regexp_contents: /* none */
		    {
		    /*%%%*/
			$$ = 0;
		    /*% %*/
		    /*% ripper: regexp_new! %*/
		    /*%%%*/
		    /*%
			$$ = ripper_new_yylval(p, 0, $$, 0);
		    %*/
		    }
		| regexp_contents string_content
		    {
		    /*%%%*/
			NODE *head = $1, *tail = $2;
			if (!head) {
			    $$ = tail;
			}
			else if (!tail) {
			    $$ = head;
			}
			else {
			    switch (nd_type(head)) {
			      case NODE_STR:
				nd_set_type(head, NODE_DSTR);
				break;
			      case NODE_DSTR:
				break;
			      default:
				head = list_append(p, NEW_DSTR(Qnil, &@$), head);
				break;
			    }
			    $$ = list_append(p, head, tail);
			}
		    /*%
			VALUE s1 = 1, s2 = 0, n1 = $1, n2 = $2;
			if (ripper_is_node_yylval(n1)) {
			    s1 = RNODE(n1)->nd_cval;
			    n1 = RNODE(n1)->nd_rval;
			}
			if (ripper_is_node_yylval(n2)) {
			    s2 = RNODE(n2)->nd_cval;
			    n2 = RNODE(n2)->nd_rval;
			}
			$$ = dispatch2(regexp_add, n1, n2);
			if (!s1 && s2) {
			    $$ = ripper_new_yylval(p, 0, $$, s2);
			}
		    %*/
		    }
		;

string_content	: tSTRING_CONTENT
		    /*% ripper[brace]: ripper_new_yylval(p, 0, get_value($1), $1) %*/
		| tSTRING_DVAR
		    {
			/* need to backup p->lex.strterm so that a string literal `%&foo,#$&,bar&` can be parsed */
			$<strterm>$ = p->lex.strterm;
			p->lex.strterm = 0;
			SET_LEX_STATE(EXPR_BEG);
		    }
		  string_dvar
		    {
			p->lex.strterm = $<strterm>2;
		    /*%%%*/
			$$ = NEW_EVSTR($3, &@$);
			nd_set_line($$, @3.end_pos.lineno);
		    /*% %*/
		    /*% ripper: string_dvar!($3) %*/
		    }
		| tSTRING_DBEG
		    {
			CMDARG_PUSH(0);
			COND_PUSH(0);
		    }
		    {
			/* need to backup p->lex.strterm so that a string literal `%!foo,#{ !0 },bar!` can be parsed */
			$<strterm>$ = p->lex.strterm;
			p->lex.strterm = 0;
		    }
		    {
			$<num>$ = p->lex.state;
			SET_LEX_STATE(EXPR_BEG);
		    }
		    {
			$<num>$ = p->lex.brace_nest;
			p->lex.brace_nest = 0;
		    }
		    {
			$<num>$ = p->heredoc_indent;
			p->heredoc_indent = 0;
		    }
		  compstmt tSTRING_DEND
		    {
			COND_POP();
			CMDARG_POP();
			p->lex.strterm = $<strterm>3;
			SET_LEX_STATE($<num>4);
			p->lex.brace_nest = $<num>5;
			p->heredoc_indent = $<num>6;
			p->heredoc_line_indent = -1;
		    /*%%%*/
			if ($7) $7->flags &= ~NODE_FL_NEWLINE;
			$$ = new_evstr(p, $7, &@$);
		    /*% %*/
		    /*% ripper: string_embexpr!($7) %*/
		    }
		;

string_dvar	: tGVAR
		    {
		    /*%%%*/
			$$ = NEW_GVAR($1, &@$);
		    /*% %*/
		    /*% ripper: var_ref!($1) %*/
		    }
		| tIVAR
		    {
		    /*%%%*/
			$$ = NEW_IVAR($1, &@$);
		    /*% %*/
		    /*% ripper: var_ref!($1) %*/
		    }
		| tCVAR
		    {
		    /*%%%*/
			$$ = NEW_CVAR($1, &@$);
		    /*% %*/
		    /*% ripper: var_ref!($1) %*/
		    }
		| backref
		;

symbol		: ssym
		| dsym
		;

ssym		: tSYMBEG sym
		    {
			SET_LEX_STATE(EXPR_END);
		    /*%%%*/
			$$ = NEW_LIT(ID2SYM($2), &@$);
		    /*% %*/
		    /*% ripper: symbol_literal!(symbol!($2)) %*/
		    }
		;

sym		: fname
		| tIVAR
		| tGVAR
		| tCVAR
		;

dsym		: tSYMBEG string_contents tSTRING_END
		    {
			SET_LEX_STATE(EXPR_END);
		    /*%%%*/
			$$ = dsym_node(p, $2, &@$);
		    /*% %*/
		    /*% ripper: dyna_symbol!($2) %*/
		    }
		;

numeric 	: simple_numeric
		| tUMINUS_NUM simple_numeric   %prec tLOWEST
		    {
		    /*%%%*/
			$$ = $2;
			RB_OBJ_WRITE(p->ast, &$$->nd_lit, negate_lit(p, $$->nd_lit));
		    /*% %*/
		    /*% ripper: unary!(ID2VAL(idUMinus), $2) %*/
		    }
		;

simple_numeric	: tINTEGER
		| tFLOAT
		| tRATIONAL
		| tIMAGINARY
		;

user_variable	: tIDENTIFIER
		| tIVAR
		| tGVAR
		| tCONSTANT
		| tCVAR
		;

keyword_variable: keyword_nil {$$ = KWD2EID(nil, $1);}
		| keyword_self {$$ = KWD2EID(self, $1);}
		| keyword_true {$$ = KWD2EID(true, $1);}
		| keyword_false {$$ = KWD2EID(false, $1);}
		| keyword__FILE__ {$$ = KWD2EID(_FILE__, $1);}
		| keyword__LINE__ {$$ = KWD2EID(_LINE__, $1);}
		| keyword__ENCODING__ {$$ = KWD2EID(_ENCODING__, $1);}
		;

var_ref		: user_variable
		    {
		    /*%%%*/
			if (!($$ = gettable(p, $1, &@$))) $$ = NEW_BEGIN(0, &@$);
		    /*%
			if (id_is_var(p, get_id($1))) {
			    $$ = dispatch1(var_ref, $1);
			}
			else {
			    $$ = dispatch1(vcall, $1);
			}
		    %*/
		    }
		| keyword_variable
		    {
		    /*%%%*/
			if (!($$ = gettable(p, $1, &@$))) $$ = NEW_BEGIN(0, &@$);
		    /*% %*/
		    /*% ripper: var_ref!($1) %*/
		    }
		;

var_lhs		: user_variable
		    {
		    /*%%%*/
			$$ = assignable(p, $1, 0, &@$);
		    /*% %*/
		    /*% ripper: assignable(p, var_field(p, $1)) %*/
		    }
		| keyword_variable
		    {
		    /*%%%*/
			$$ = assignable(p, $1, 0, &@$);
		    /*% %*/
		    /*% ripper: assignable(p, var_field(p, $1)) %*/
		    }
		;

backref		: tNTH_REF
		| tBACK_REF
		;

superclass	: '<'
		    {
			SET_LEX_STATE(EXPR_BEG);
			p->command_start = TRUE;
		    }
		  expr_value term
		    {
			$$ = $3;
		    }
		| /* none */
		    {
		    /*%%%*/
			$$ = 0;
		    /*% %*/
		    /*% ripper: Qnil %*/
		    }
		;

f_opt_paren_args: f_paren_args | none;

f_paren_args	: '(' f_args rparen
		    {
		    /*%%%*/
			$$ = $2;
		    /*% %*/
		    /*% ripper: paren!($2) %*/
			SET_LEX_STATE(EXPR_BEG);
			p->command_start = TRUE;
		    }
		| '(' f_arg ',' args_forward rparen
		    {
			add_forwarding_args(p);
		    /*%%%*/
			$$ = new_args_forward_def(p, $2, &@$);
		    /*% %*/
		    /*% ripper: paren!(params!($2, Qnone, $4, Qnone, Qnone, Qnone, Qnone)) %*/
			SET_LEX_STATE(EXPR_BEG);
			p->command_start = TRUE;
		    }
		| '(' args_forward rparen
		    {
			add_forwarding_args(p);
		    /*%%%*/
			$$ = new_args_forward_def(p, 0, &@$);
		    /*% %*/
		    /*% ripper: paren!(params!(Qnone, Qnone, $2, Qnone, Qnone, Qnone, Qnone)) %*/
			SET_LEX_STATE(EXPR_BEG);
			p->command_start = TRUE;
		    }
                ;

f_arglist	: f_paren_args
		|   {
			$<ctxt>$ = p->ctxt;
			p->ctxt.in_kwarg = 1;
			SET_LEX_STATE(p->lex.state|EXPR_LABEL); /* force for args */
		    }
		  f_args term
		    {
			p->ctxt.in_kwarg = $<ctxt>1.in_kwarg;
			$$ = $2;
			SET_LEX_STATE(EXPR_BEG);
			p->command_start = TRUE;
		    }
		;

args_tail	: f_kwarg ',' f_kwrest opt_f_block_arg
		    {
			$$ = new_args_tail(p, $1, $3, $4, &@3);
		    }
		| f_kwarg opt_f_block_arg
		    {
			$$ = new_args_tail(p, $1, Qnone, $2, &@1);
		    }
		| f_any_kwrest opt_f_block_arg
		    {
			$$ = new_args_tail(p, Qnone, $1, $2, &@1);
		    }
		| f_block_arg
		    {
			$$ = new_args_tail(p, Qnone, Qnone, $1, &@1);
		    }
		;

opt_args_tail	: ',' args_tail
		    {
			$$ = $2;
		    }
		| /* none */
		    {
			$$ = new_args_tail(p, Qnone, Qnone, Qnone, &@0);
		    }
		;

f_args		: f_arg ',' f_optarg ',' f_rest_arg opt_args_tail
		    {
			$$ = new_args(p, $1, $3, $5, Qnone, $6, &@$);
		    }
		| f_arg ',' f_optarg ',' f_rest_arg ',' f_arg opt_args_tail
		    {
			$$ = new_args(p, $1, $3, $5, $7, $8, &@$);
		    }
		| f_arg ',' f_optarg opt_args_tail
		    {
			$$ = new_args(p, $1, $3, Qnone, Qnone, $4, &@$);
		    }
		| f_arg ',' f_optarg ',' f_arg opt_args_tail
		    {
			$$ = new_args(p, $1, $3, Qnone, $5, $6, &@$);
		    }
		| f_arg ',' f_rest_arg opt_args_tail
		    {
			$$ = new_args(p, $1, Qnone, $3, Qnone, $4, &@$);
		    }
		| f_arg ',' f_rest_arg ',' f_arg opt_args_tail
		    {
			$$ = new_args(p, $1, Qnone, $3, $5, $6, &@$);
		    }
		| f_arg opt_args_tail
		    {
			$$ = new_args(p, $1, Qnone, Qnone, Qnone, $2, &@$);
		    }
		| f_optarg ',' f_rest_arg opt_args_tail
		    {
			$$ = new_args(p, Qnone, $1, $3, Qnone, $4, &@$);
		    }
		| f_optarg ',' f_rest_arg ',' f_arg opt_args_tail
		    {
			$$ = new_args(p, Qnone, $1, $3, $5, $6, &@$);
		    }
		| f_optarg opt_args_tail
		    {
			$$ = new_args(p, Qnone, $1, Qnone, Qnone, $2, &@$);
		    }
		| f_optarg ',' f_arg opt_args_tail
		    {
			$$ = new_args(p, Qnone, $1, Qnone, $3, $4, &@$);
		    }
		| f_rest_arg opt_args_tail
		    {
			$$ = new_args(p, Qnone, Qnone, $1, Qnone, $2, &@$);
		    }
		| f_rest_arg ',' f_arg opt_args_tail
		    {
			$$ = new_args(p, Qnone, Qnone, $1, $3, $4, &@$);
		    }
		| args_tail
		    {
			$$ = new_args(p, Qnone, Qnone, Qnone, Qnone, $1, &@$);
		    }
		| /* none */
		    {
			$$ = new_args_tail(p, Qnone, Qnone, Qnone, &@0);
			$$ = new_args(p, Qnone, Qnone, Qnone, Qnone, $$, &@0);
		    }
		;

args_forward	: tBDOT3
		    {
		    /*%%%*/
			$$ = idDot3;
		    /*% %*/
		    /*% ripper: args_forward! %*/
		    }
		;

f_bad_arg	: tCONSTANT
		    {
			static const char mesg[] = "formal argument cannot be a constant";
		    /*%%%*/
			yyerror1(&@1, mesg);
			$$ = 0;
		    /*% %*/
		    /*% ripper[error]: param_error!(ERR_MESG(), $1) %*/
		    }
		| tIVAR
		    {
			static const char mesg[] = "formal argument cannot be an instance variable";
		    /*%%%*/
			yyerror1(&@1, mesg);
			$$ = 0;
		    /*% %*/
		    /*% ripper[error]: param_error!(ERR_MESG(), $1) %*/
		    }
		| tGVAR
		    {
			static const char mesg[] = "formal argument cannot be a global variable";
		    /*%%%*/
			yyerror1(&@1, mesg);
			$$ = 0;
		    /*% %*/
		    /*% ripper[error]: param_error!(ERR_MESG(), $1) %*/
		    }
		| tCVAR
		    {
			static const char mesg[] = "formal argument cannot be a class variable";
		    /*%%%*/
			yyerror1(&@1, mesg);
			$$ = 0;
		    /*% %*/
		    /*% ripper[error]: param_error!(ERR_MESG(), $1) %*/
		    }
		;

f_norm_arg	: f_bad_arg
		| tIDENTIFIER
		    {
			formal_argument(p, get_id($1));
			p->max_numparam = ORDINAL_PARAM;
			$$ = $1;
		    }
		;

f_arg_asgn	: f_norm_arg
		    {
			ID id = get_id($1);
			arg_var(p, id);
			p->cur_arg = id;
			$$ = $1;
		    }
		;

f_arg_item	: f_arg_asgn
		    {
			p->cur_arg = 0;
		    /*%%%*/
			$$ = NEW_ARGS_AUX($1, 1, &NULL_LOC);
		    /*% %*/
		    /*% ripper: get_value($1) %*/
		    }
		| tLPAREN f_margs rparen
		    {
		    /*%%%*/
			ID tid = internal_id(p);
			YYLTYPE loc;
			loc.beg_pos = @2.beg_pos;
			loc.end_pos = @2.beg_pos;
			arg_var(p, tid);
			if (dyna_in_block(p)) {
			    $2->nd_value = NEW_DVAR(tid, &loc);
			}
			else {
			    $2->nd_value = NEW_LVAR(tid, &loc);
			}
			$$ = NEW_ARGS_AUX(tid, 1, &NULL_LOC);
			$$->nd_next = $2;
		    /*% %*/
		    /*% ripper: mlhs_paren!($2) %*/
		    }
		;

f_arg		: f_arg_item
		    /*% ripper[brace]: rb_ary_new3(1, get_value($1)) %*/
		| f_arg ',' f_arg_item
		    {
		    /*%%%*/
			$$ = $1;
			$$->nd_plen++;
			$$->nd_next = block_append(p, $$->nd_next, $3->nd_next);
			rb_discard_node(p, $3);
		    /*% %*/
		    /*% ripper: rb_ary_push($1, get_value($3)) %*/
		    }
		;


f_label 	: tLABEL
		    {
			ID id = get_id($1);
			arg_var(p, formal_argument(p, id));
			p->cur_arg = id;
			p->max_numparam = ORDINAL_PARAM;
			$$ = $1;
		    }
		;

f_kw		: f_label arg_value
		    {
			p->cur_arg = 0;
		    /*%%%*/
			$$ = new_kw_arg(p, assignable(p, $1, $2, &@$), &@$);
		    /*% %*/
		    /*% ripper: rb_assoc_new(get_value(assignable(p, $1)), get_value($2)) %*/
		    }
		| f_label
		    {
			p->cur_arg = 0;
		    /*%%%*/
			$$ = new_kw_arg(p, assignable(p, $1, NODE_SPECIAL_REQUIRED_KEYWORD, &@$), &@$);
		    /*% %*/
		    /*% ripper: rb_assoc_new(get_value(assignable(p, $1)), 0) %*/
		    }
		;

f_block_kw	: f_label primary_value
		    {
		    /*%%%*/
			$$ = new_kw_arg(p, assignable(p, $1, $2, &@$), &@$);
		    /*% %*/
		    /*% ripper: rb_assoc_new(get_value(assignable(p, $1)), get_value($2)) %*/
		    }
		| f_label
		    {
		    /*%%%*/
			$$ = new_kw_arg(p, assignable(p, $1, NODE_SPECIAL_REQUIRED_KEYWORD, &@$), &@$);
		    /*% %*/
		    /*% ripper: rb_assoc_new(get_value(assignable(p, $1)), 0) %*/
		    }
		;

f_block_kwarg	: f_block_kw
		    {
		    /*%%%*/
			$$ = $1;
		    /*% %*/
		    /*% ripper: rb_ary_new3(1, get_value($1)) %*/
		    }
		| f_block_kwarg ',' f_block_kw
		    {
		    /*%%%*/
			$$ = kwd_append($1, $3);
		    /*% %*/
		    /*% ripper: rb_ary_push($1, get_value($3)) %*/
		    }
		;


f_kwarg		: f_kw
		    {
		    /*%%%*/
			$$ = $1;
		    /*% %*/
		    /*% ripper: rb_ary_new3(1, get_value($1)) %*/
		    }
		| f_kwarg ',' f_kw
		    {
		    /*%%%*/
			$$ = kwd_append($1, $3);
		    /*% %*/
		    /*% ripper: rb_ary_push($1, get_value($3)) %*/
		    }
		;

kwrest_mark	: tPOW
		| tDSTAR
		;

f_no_kwarg	: kwrest_mark keyword_nil
		    {
		    /*%%%*/
		    /*% %*/
		    /*% ripper: nokw_param!(Qnil) %*/
		    }
		;

f_kwrest	: kwrest_mark tIDENTIFIER
		    {
			arg_var(p, shadowing_lvar(p, get_id($2)));
		    /*%%%*/
			$$ = $2;
		    /*% %*/
		    /*% ripper: kwrest_param!($2) %*/
		    }
		| kwrest_mark
		    {
		    /*%%%*/
			$$ = internal_id(p);
			arg_var(p, $$);
		    /*% %*/
		    /*% ripper: kwrest_param!(Qnil) %*/
		    }
		;

f_opt		: f_arg_asgn '=' arg_value
		    {
			p->cur_arg = 0;
		    /*%%%*/
			$$ = NEW_OPT_ARG(0, assignable(p, $1, $3, &@$), &@$);
		    /*% %*/
		    /*% ripper: rb_assoc_new(get_value(assignable(p, $1)), get_value($3)) %*/
		    }
		;

f_block_opt	: f_arg_asgn '=' primary_value
		    {
			p->cur_arg = 0;
		    /*%%%*/
			$$ = NEW_OPT_ARG(0, assignable(p, $1, $3, &@$), &@$);
		    /*% %*/
		    /*% ripper: rb_assoc_new(get_value(assignable(p, $1)), get_value($3)) %*/
		    }
		;

f_block_optarg	: f_block_opt
		    {
		    /*%%%*/
			$$ = $1;
		    /*% %*/
		    /*% ripper: rb_ary_new3(1, get_value($1)) %*/
		    }
		| f_block_optarg ',' f_block_opt
		    {
		    /*%%%*/
			$$ = opt_arg_append($1, $3);
		    /*% %*/
		    /*% ripper: rb_ary_push($1, get_value($3)) %*/
		    }
		;

f_optarg	: f_opt
		    {
		    /*%%%*/
			$$ = $1;
		    /*% %*/
		    /*% ripper: rb_ary_new3(1, get_value($1)) %*/
		    }
		| f_optarg ',' f_opt
		    {
		    /*%%%*/
			$$ = opt_arg_append($1, $3);
		    /*% %*/
		    /*% ripper: rb_ary_push($1, get_value($3)) %*/
		    }
		;

restarg_mark	: '*'
		| tSTAR
		;

f_rest_arg	: restarg_mark tIDENTIFIER
		    {
			arg_var(p, shadowing_lvar(p, get_id($2)));
		    /*%%%*/
			$$ = $2;
		    /*% %*/
		    /*% ripper: rest_param!($2) %*/
		    }
		| restarg_mark
		    {
		    /*%%%*/
			$$ = internal_id(p);
			arg_var(p, $$);
		    /*% %*/
		    /*% ripper: rest_param!(Qnil) %*/
		    }
		;

blkarg_mark	: '&'
		| tAMPER
		;

f_block_arg	: blkarg_mark tIDENTIFIER
		    {
			arg_var(p, shadowing_lvar(p, get_id($2)));
		    /*%%%*/
			$$ = $2;
		    /*% %*/
		    /*% ripper: blockarg!($2) %*/
		    }
		;

opt_f_block_arg	: ',' f_block_arg
		    {
			$$ = $2;
		    }
		| none
		    {
			$$ = Qnull;
		    }
		;

singleton	: var_ref
		    {
			value_expr($1);
			$$ = $1;
		    }
		| '(' {SET_LEX_STATE(EXPR_BEG);} expr rparen
		    {
		    /*%%%*/
			switch (nd_type($3)) {
			  case NODE_STR:
			  case NODE_DSTR:
			  case NODE_XSTR:
			  case NODE_DXSTR:
			  case NODE_DREGX:
			  case NODE_LIT:
			  case NODE_LIST:
			  case NODE_ZLIST:
			    yyerror1(&@3, "can't define singleton method for literals");
			    break;
			  default:
			    value_expr($3);
			    break;
			}
			$$ = $3;
		    /*% %*/
		    /*% ripper: paren!($3) %*/
		    }
		;

assoc_list	: none
		| assocs trailer
		    {
		    /*%%%*/
			$$ = $1;
		    /*% %*/
		    /*% ripper: assoclist_from_args!($1) %*/
		    }
		;

assocs		: assoc
		    /*% ripper[brace]: rb_ary_new3(1, get_value($1)) %*/
		| assocs ',' assoc
		    {
		    /*%%%*/
			NODE *assocs = $1;
			NODE *tail = $3;
			if (!assocs) {
			    assocs = tail;
			}
			else if (tail) {
                            if (assocs->nd_head &&
                                !tail->nd_head && nd_type(tail->nd_next) == NODE_LIST &&
                                nd_type(tail->nd_next->nd_head) == NODE_HASH) {
                                /* DSTAR */
                                tail = tail->nd_next->nd_head->nd_head;
                            }
			    assocs = list_concat(assocs, tail);
			}
			$$ = assocs;
		    /*% %*/
		    /*% ripper: rb_ary_push($1, get_value($3)) %*/
		    }
		;

assoc		: arg_value tASSOC arg_value
		    {
		    /*%%%*/
			if (nd_type($1) == NODE_STR) {
			    nd_set_type($1, NODE_LIT);
			    RB_OBJ_WRITE(p->ast, &$1->nd_lit, rb_fstring($1->nd_lit));
			}
			$$ = list_append(p, NEW_LIST($1, &@$), $3);
		    /*% %*/
		    /*% ripper: assoc_new!($1, $3) %*/
		    }
		| tLABEL arg_value
		    {
		    /*%%%*/
			$$ = list_append(p, NEW_LIST(NEW_LIT(ID2SYM($1), &@1), &@$), $2);
		    /*% %*/
		    /*% ripper: assoc_new!($1, $2) %*/
		    }
		| tSTRING_BEG string_contents tLABEL_END arg_value
		    {
		    /*%%%*/
			YYLTYPE loc = code_loc_gen(&@1, &@3);
			$$ = list_append(p, NEW_LIST(dsym_node(p, $2, &loc), &loc), $4);
		    /*% %*/
		    /*% ripper: assoc_new!(dyna_symbol!($2), $4) %*/
		    }
		| tDSTAR arg_value
		    {
		    /*%%%*/
                        if (nd_type($2) == NODE_HASH &&
                            !($2->nd_head && $2->nd_head->nd_alen)) {
                            static VALUE empty_hash;
                            if (!empty_hash) {
                                empty_hash = rb_obj_freeze(rb_hash_new());
                                rb_gc_register_mark_object(empty_hash);
                            }
                            $$ = list_append(p, NEW_LIST(0, &@$), NEW_LIT(empty_hash, &@$));
                        }
                        else
                            $$ = list_append(p, NEW_LIST(0, &@$), $2);
		    /*% %*/
		    /*% ripper: assoc_splat!($2) %*/
		    }
		;

operation	: tIDENTIFIER
		| tCONSTANT
		| tFID
		;

operation2	: tIDENTIFIER
		| tCONSTANT
		| tFID
		| op
		;

operation3	: tIDENTIFIER
		| tFID
		| op
		;

dot_or_colon	: '.'
		| tCOLON2
		;

call_op 	: '.'
		| tANDDOT
		;

call_op2	: call_op
		| tCOLON2
		;

opt_terms	: /* none */
		| terms
		;

opt_nl		: /* none */
		| '\n'
		;

rparen		: opt_nl ')'
		;

rbracket	: opt_nl ']'
		;

rbrace		: opt_nl '}'
		;

trailer		: /* none */
		| '\n'
		| ','
		;

term		: ';' {yyerrok;token_flush(p);}
		| '\n' {token_flush(p);}
		;

terms		: term
		| terms ';' {yyerrok;}
		;

none		: /* none */
		    {
			$$ = Qnull;
		    }
		;
%%
# undef p
# undef yylex
# undef yylval
# define yylval  (*p->lval)

static int regx_options(struct parser_params*);
static int tokadd_string(struct parser_params*,int,int,int,long*,rb_encoding**,rb_encoding**);
static void tokaddmbc(struct parser_params *p, int c, rb_encoding *enc);
static enum yytokentype parse_string(struct parser_params*,rb_strterm_literal_t*);
static enum yytokentype here_document(struct parser_params*,rb_strterm_heredoc_t*);

#ifndef RIPPER
# define set_yylval_node(x) {				\
  YYLTYPE _cur_loc;					\
  rb_parser_set_location(p, &_cur_loc);			\
  yylval.node = (x);					\
}
# define set_yylval_str(x) \
do { \
  set_yylval_node(NEW_STR(x, &_cur_loc)); \
  RB_OBJ_WRITTEN(p->ast, Qnil, x); \
} while(0)
# define set_yylval_literal(x) \
do { \
  set_yylval_node(NEW_LIT(x, &_cur_loc)); \
  RB_OBJ_WRITTEN(p->ast, Qnil, x); \
} while(0)
# define set_yylval_num(x) (yylval.num = (x))
# define set_yylval_id(x)  (yylval.id = (x))
# define set_yylval_name(x)  (yylval.id = (x))
# define yylval_id() (yylval.id)
#else
static inline VALUE
ripper_yylval_id(struct parser_params *p, ID x)
{
    return ripper_new_yylval(p, x, ID2SYM(x), 0);
}
# define set_yylval_str(x) (yylval.val = add_mark_object(p, (x)))
# define set_yylval_num(x) (yylval.val = ripper_new_yylval(p, (x), 0, 0))
# define set_yylval_id(x)  (void)(x)
# define set_yylval_name(x) (void)(yylval.val = ripper_yylval_id(p, x))
# define set_yylval_literal(x) add_mark_object(p, (x))
# define set_yylval_node(x) (yylval.val = ripper_new_yylval(p, 0, 0, STR_NEW(p->lex.ptok, p->lex.pcur-p->lex.ptok)))
# define yylval_id() yylval.id
# define _cur_loc NULL_LOC /* dummy */
#endif

#define set_yylval_noname() set_yylval_id(keyword_nil)

#ifndef RIPPER
#define literal_flush(p, ptr) ((p)->lex.ptok = (ptr))
#define dispatch_scan_event(p, t) ((void)0)
#define dispatch_delayed_token(p, t) ((void)0)
#define has_delayed_token(p) (0)
#else
#define literal_flush(p, ptr) ((void)(ptr))

#define yylval_rval (*(RB_TYPE_P(yylval.val, T_NODE) ? &yylval.node->nd_rval : &yylval.val))

static inline VALUE
intern_sym(const char *name)
{
    ID id = rb_intern_const(name);
    return ID2SYM(id);
}

static int
ripper_has_scan_event(struct parser_params *p)
{
    if (p->lex.pcur < p->lex.ptok) rb_raise(rb_eRuntimeError, "lex.pcur < lex.ptok");
    return p->lex.pcur > p->lex.ptok;
}

static VALUE
ripper_scan_event_val(struct parser_params *p, enum yytokentype t)
{
    VALUE str = STR_NEW(p->lex.ptok, p->lex.pcur - p->lex.ptok);
    VALUE rval = ripper_dispatch1(p, ripper_token2eventid(t), str);
    token_flush(p);
    return rval;
}

static void
ripper_dispatch_scan_event(struct parser_params *p, enum yytokentype t)
{
    if (!ripper_has_scan_event(p)) return;
    add_mark_object(p, yylval_rval = ripper_scan_event_val(p, t));
}
#define dispatch_scan_event(p, t) ripper_dispatch_scan_event(p, t)

static void
ripper_dispatch_delayed_token(struct parser_params *p, enum yytokentype t)
{
    int saved_line = p->ruby_sourceline;
    const char *saved_tokp = p->lex.ptok;

    if (NIL_P(p->delayed.token)) return;
    p->ruby_sourceline = p->delayed.line;
    p->lex.ptok = p->lex.pbeg + p->delayed.col;
    add_mark_object(p, yylval_rval = ripper_dispatch1(p, ripper_token2eventid(t), p->delayed.token));
    p->delayed.token = Qnil;
    p->ruby_sourceline = saved_line;
    p->lex.ptok = saved_tokp;
}
#define dispatch_delayed_token(p, t) ripper_dispatch_delayed_token(p, t)
#define has_delayed_token(p) (!NIL_P(p->delayed.token))
#endif /* RIPPER */

static inline int
is_identchar(const char *ptr, const char *MAYBE_UNUSED(ptr_end), rb_encoding *enc)
{
    return rb_enc_isalnum((unsigned char)*ptr, enc) || *ptr == '_' || !ISASCII(*ptr);
}

static inline int
parser_is_identchar(struct parser_params *p)
{
    return !(p)->eofp && is_identchar(p->lex.pcur-1, p->lex.pend, p->enc);
}

static inline int
parser_isascii(struct parser_params *p)
{
    return ISASCII(*(p->lex.pcur-1));
}

static void
token_info_setup(token_info *ptinfo, const char *ptr, const rb_code_location_t *loc)
{
    int column = 1, nonspc = 0, i;
    for (i = 0; i < loc->beg_pos.column; i++, ptr++) {
	if (*ptr == '\t') {
	    column = (((column - 1) / TAB_WIDTH) + 1) * TAB_WIDTH;
	}
	column++;
	if (*ptr != ' ' && *ptr != '\t') {
	    nonspc = 1;
	}
    }

    ptinfo->beg = loc->beg_pos;
    ptinfo->indent = column;
    ptinfo->nonspc = nonspc;
}

static void
token_info_push(struct parser_params *p, const char *token, const rb_code_location_t *loc)
{
    token_info *ptinfo;

    if (!p->token_info_enabled) return;
    ptinfo = ALLOC(token_info);
    ptinfo->token = token;
    ptinfo->next = p->token_info;
    token_info_setup(ptinfo, p->lex.pbeg, loc);

    p->token_info = ptinfo;
}

static void
token_info_pop(struct parser_params *p, const char *token, const rb_code_location_t *loc)
{
    token_info *ptinfo_beg = p->token_info;

    if (!ptinfo_beg) return;
    p->token_info = ptinfo_beg->next;

    /* indentation check of matched keywords (begin..end, if..end, etc.) */
    token_info_warn(p, token, ptinfo_beg, 1, loc);
    ruby_sized_xfree(ptinfo_beg, sizeof(*ptinfo_beg));
}

static void
token_info_drop(struct parser_params *p, const char *token, rb_code_position_t beg_pos)
{
    token_info *ptinfo_beg = p->token_info;

    if (!ptinfo_beg) return;
    p->token_info = ptinfo_beg->next;

    if (ptinfo_beg->beg.lineno != beg_pos.lineno ||
	ptinfo_beg->beg.column != beg_pos.column ||
	strcmp(ptinfo_beg->token, token)) {
	compile_error(p, "token position mismatch: %d:%d:%s expected but %d:%d:%s",
		      beg_pos.lineno, beg_pos.column, token,
		      ptinfo_beg->beg.lineno, ptinfo_beg->beg.column,
		      ptinfo_beg->token);
    }

    ruby_sized_xfree(ptinfo_beg, sizeof(*ptinfo_beg));
}

static void
token_info_warn(struct parser_params *p, const char *token, token_info *ptinfo_beg, int same, const rb_code_location_t *loc)
{
    token_info ptinfo_end_body, *ptinfo_end = &ptinfo_end_body;
    if (!p->token_info_enabled) return;
    if (!ptinfo_beg) return;
    token_info_setup(ptinfo_end, p->lex.pbeg, loc);
    if (ptinfo_beg->beg.lineno == ptinfo_end->beg.lineno) return; /* ignore one-line block */
    if (ptinfo_beg->nonspc || ptinfo_end->nonspc) return; /* ignore keyword in the middle of a line */
    if (ptinfo_beg->indent == ptinfo_end->indent) return; /* the indents are matched */
    if (!same && ptinfo_beg->indent < ptinfo_end->indent) return;
    rb_warn3L(ptinfo_end->beg.lineno,
	      "mismatched indentations at '%s' with '%s' at %d",
	      WARN_S(token), WARN_S(ptinfo_beg->token), WARN_I(ptinfo_beg->beg.lineno));
}

static int
parser_precise_mbclen(struct parser_params *p, const char *ptr)
{
    int len = rb_enc_precise_mbclen(ptr, p->lex.pend, p->enc);
    if (!MBCLEN_CHARFOUND_P(len)) {
	compile_error(p, "invalid multibyte char (%s)", rb_enc_name(p->enc));
	return -1;
    }
    return len;
}

#ifndef RIPPER
static void ruby_show_error_line(VALUE errbuf, const YYLTYPE *yylloc, int lineno, VALUE str);

static inline void
parser_show_error_line(struct parser_params *p, const YYLTYPE *yylloc)
{
    VALUE str;
    int lineno = p->ruby_sourceline;
    if (!yylloc) {
	return;
    }
    else if (yylloc->beg_pos.lineno == lineno) {
	str = p->lex.lastline;
    }
    else {
	return;
    }
    ruby_show_error_line(p->error_buffer, yylloc, lineno, str);
}

static int
parser_yyerror(struct parser_params *p, const YYLTYPE *yylloc, const char *msg)
{
    YYLTYPE current;

    if (!yylloc) {
	yylloc = RUBY_SET_YYLLOC(current);
    }
    else if ((p->ruby_sourceline != yylloc->beg_pos.lineno &&
	      p->ruby_sourceline != yylloc->end_pos.lineno) ||
	     (yylloc->beg_pos.lineno == yylloc->end_pos.lineno &&
	      yylloc->beg_pos.column == yylloc->end_pos.column)) {
	yylloc = 0;
    }
    compile_error(p, "%s", msg);
    parser_show_error_line(p, yylloc);
    return 0;
}

static void
ruby_show_error_line(VALUE errbuf, const YYLTYPE *yylloc, int lineno, VALUE str)
{
    VALUE mesg;
    const int max_line_margin = 30;
    const char *ptr, *ptr_end, *pt, *pb;
    const char *pre = "", *post = "", *pend;
    const char *code = "", *caret = "";
    const char *lim;
    const char *const pbeg = RSTRING_PTR(str);
    char *buf;
    long len;
    int i;

    if (!yylloc) return;
    pend = RSTRING_END(str);
    if (pend > pbeg && pend[-1] == '\n') {
	if (--pend > pbeg && pend[-1] == '\r') --pend;
    }

    pt = pend;
    if (lineno == yylloc->end_pos.lineno &&
	(pend - pbeg) > yylloc->end_pos.column) {
	pt = pbeg + yylloc->end_pos.column;
    }

    ptr = ptr_end = pt;
    lim = ptr - pbeg > max_line_margin ? ptr - max_line_margin : pbeg;
    while ((lim < ptr) && (*(ptr-1) != '\n')) ptr--;

    lim = pend - ptr_end > max_line_margin ? ptr_end + max_line_margin : pend;
    while ((ptr_end < lim) && (*ptr_end != '\n') && (*ptr_end != '\r')) ptr_end++;

    len = ptr_end - ptr;
    if (len > 4) {
	if (ptr > pbeg) {
	    ptr = rb_enc_prev_char(pbeg, ptr, pt, rb_enc_get(str));
	    if (ptr > pbeg) pre = "...";
	}
	if (ptr_end < pend) {
	    ptr_end = rb_enc_prev_char(pt, ptr_end, pend, rb_enc_get(str));
	    if (ptr_end < pend) post = "...";
	}
    }
    pb = pbeg;
    if (lineno == yylloc->beg_pos.lineno) {
	pb += yylloc->beg_pos.column;
	if (pb > pt) pb = pt;
    }
    if (pb < ptr) pb = ptr;
    if (len <= 4 && yylloc->beg_pos.lineno == yylloc->end_pos.lineno) {
	return;
    }
    if (RTEST(errbuf)) {
	mesg = rb_attr_get(errbuf, idMesg);
	if (RSTRING_LEN(mesg) > 0 && *(RSTRING_END(mesg)-1) != '\n')
	    rb_str_cat_cstr(mesg, "\n");
    }
    else {
	mesg = rb_enc_str_new(0, 0, rb_enc_get(str));
    }
    if (!errbuf && rb_stderr_tty_p()) {
#define CSI_BEGIN "\033["
#define CSI_SGR "m"
	rb_str_catf(mesg,
		    CSI_BEGIN""CSI_SGR"%s" /* pre */
		    CSI_BEGIN"1"CSI_SGR"%.*s"
		    CSI_BEGIN"1;4"CSI_SGR"%.*s"
		    CSI_BEGIN";1"CSI_SGR"%.*s"
		    CSI_BEGIN""CSI_SGR"%s" /* post */
		    "\n",
		    pre,
		    (int)(pb - ptr), ptr,
		    (int)(pt - pb), pb,
		    (int)(ptr_end - pt), pt,
		    post);
    }
    else {
	char *p2;

	len = ptr_end - ptr;
	lim = pt < pend ? pt : pend;
	i = (int)(lim - ptr);
	buf = ALLOCA_N(char, i+2);
	code = ptr;
	caret = p2 = buf;
	if (ptr <= pb) {
	    while (ptr < pb) {
		*p2++ = *ptr++ == '\t' ? '\t' : ' ';
	    }
	    *p2++ = '^';
	    ptr++;
	}
	if (lim > ptr) {
	    memset(p2, '~', (lim - ptr));
	    p2 += (lim - ptr);
	}
	*p2 = '\0';
	rb_str_catf(mesg, "%s%.*s%s\n""%s%s\n",
		    pre, (int)len, code, post,
		    pre, caret);
    }
    if (!errbuf) rb_write_error_str(mesg);
}
#else
static int
parser_yyerror(struct parser_params *p, const YYLTYPE *yylloc, const char *msg)
{
    const char *pcur = 0, *ptok = 0;
    if (yylloc &&
	p->ruby_sourceline == yylloc->beg_pos.lineno &&
	p->ruby_sourceline == yylloc->end_pos.lineno) {
	pcur = p->lex.pcur;
	ptok = p->lex.ptok;
	p->lex.ptok = p->lex.pbeg + yylloc->beg_pos.column;
	p->lex.pcur = p->lex.pbeg + yylloc->end_pos.column;
    }
    dispatch1(parse_error, STR_NEW2(msg));
    ripper_error(p);
    if (pcur) {
	p->lex.ptok = ptok;
	p->lex.pcur = pcur;
    }
    return 0;
}

static inline void
parser_show_error_line(struct parser_params *p, const YYLTYPE *yylloc)
{
}
#endif /* !RIPPER */

#ifndef RIPPER
static int
vtable_size(const struct vtable *tbl)
{
    if (!DVARS_TERMINAL_P(tbl)) {
	return tbl->pos;
    }
    else {
	return 0;
    }
}
#endif

static struct vtable *
vtable_alloc_gen(struct parser_params *p, int line, struct vtable *prev)
{
    struct vtable *tbl = ALLOC(struct vtable);
    tbl->pos = 0;
    tbl->capa = 8;
    tbl->tbl = ALLOC_N(ID, tbl->capa);
    tbl->prev = prev;
#ifndef RIPPER
    if (p->debug) {
	rb_parser_printf(p, "vtable_alloc:%d: %p\n", line, (void *)tbl);
    }
#endif
    return tbl;
}
#define vtable_alloc(prev) vtable_alloc_gen(p, __LINE__, prev)

static void
vtable_free_gen(struct parser_params *p, int line, const char *name,
		struct vtable *tbl)
{
#ifndef RIPPER
    if (p->debug) {
	rb_parser_printf(p, "vtable_free:%d: %s(%p)\n", line, name, (void *)tbl);
    }
#endif
    if (!DVARS_TERMINAL_P(tbl)) {
	if (tbl->tbl) {
	    ruby_sized_xfree(tbl->tbl, tbl->capa * sizeof(ID));
	}
	ruby_sized_xfree(tbl, sizeof(*tbl));
    }
}
#define vtable_free(tbl) vtable_free_gen(p, __LINE__, #tbl, tbl)

static void
vtable_add_gen(struct parser_params *p, int line, const char *name,
	       struct vtable *tbl, ID id)
{
#ifndef RIPPER
    if (p->debug) {
	rb_parser_printf(p, "vtable_add:%d: %s(%p), %s\n",
			 line, name, (void *)tbl, rb_id2name(id));
    }
#endif
    if (DVARS_TERMINAL_P(tbl)) {
	rb_parser_fatal(p, "vtable_add: vtable is not allocated (%p)", (void *)tbl);
	return;
    }
    if (tbl->pos == tbl->capa) {
	tbl->capa = tbl->capa * 2;
	SIZED_REALLOC_N(tbl->tbl, ID, tbl->capa, tbl->pos);
    }
    tbl->tbl[tbl->pos++] = id;
}
#define vtable_add(tbl, id) vtable_add_gen(p, __LINE__, #tbl, tbl, id)

#ifndef RIPPER
static void
vtable_pop_gen(struct parser_params *p, int line, const char *name,
	       struct vtable *tbl, int n)
{
    if (p->debug) {
	rb_parser_printf(p, "vtable_pop:%d: %s(%p), %d\n",
			 line, name, (void *)tbl, n);
    }
    if (tbl->pos < n) {
	rb_parser_fatal(p, "vtable_pop: unreachable (%d < %d)", tbl->pos, n);
	return;
    }
    tbl->pos -= n;
}
#define vtable_pop(tbl, n) vtable_pop_gen(p, __LINE__, #tbl, tbl, n)
#endif

static int
vtable_included(const struct vtable * tbl, ID id)
{
    int i;

    if (!DVARS_TERMINAL_P(tbl)) {
	for (i = 0; i < tbl->pos; i++) {
	    if (tbl->tbl[i] == id) {
		return i+1;
	    }
	}
    }
    return 0;
}

static void parser_prepare(struct parser_params *p);

#ifndef RIPPER
static NODE *parser_append_options(struct parser_params *p, NODE *node);

static VALUE
debug_lines(VALUE fname)
{
    ID script_lines;
    CONST_ID(script_lines, "SCRIPT_LINES__");
    if (rb_const_defined_at(rb_cObject, script_lines)) {
	VALUE hash = rb_const_get_at(rb_cObject, script_lines);
	if (RB_TYPE_P(hash, T_HASH)) {
	    VALUE lines = rb_ary_new();
	    rb_hash_aset(hash, fname, lines);
	    return lines;
	}
    }
    return 0;
}

static int
e_option_supplied(struct parser_params *p)
{
    return strcmp(p->ruby_sourcefile, "-e") == 0;
}

static VALUE
yycompile0(VALUE arg)
{
    int n;
    NODE *tree;
    struct parser_params *p = (struct parser_params *)arg;
    VALUE cov = Qfalse;

    if (!compile_for_eval && !NIL_P(p->ruby_sourcefile_string)) {
	p->debug_lines = debug_lines(p->ruby_sourcefile_string);
	if (p->debug_lines && p->ruby_sourceline > 0) {
	    VALUE str = rb_default_rs;
	    n = p->ruby_sourceline;
	    do {
		rb_ary_push(p->debug_lines, str);
	    } while (--n);
	}

	if (!e_option_supplied(p)) {
	    cov = Qtrue;
	}
    }

    parser_prepare(p);
#define RUBY_DTRACE_PARSE_HOOK(name) \
    if (RUBY_DTRACE_PARSE_##name##_ENABLED()) { \
	RUBY_DTRACE_PARSE_##name(p->ruby_sourcefile, p->ruby_sourceline); \
    }
    RUBY_DTRACE_PARSE_HOOK(BEGIN);
    n = yyparse(p);
    RUBY_DTRACE_PARSE_HOOK(END);
    p->debug_lines = 0;

    p->lex.strterm = 0;
    p->lex.pcur = p->lex.pbeg = p->lex.pend = 0;
    p->lex.prevline = p->lex.lastline = p->lex.nextline = 0;
    if (n || p->error_p) {
	VALUE mesg = p->error_buffer;
	if (!mesg) {
	    mesg = rb_class_new_instance(0, 0, rb_eSyntaxError);
	}
	rb_set_errinfo(mesg);
	return FALSE;
    }
    tree = p->eval_tree;
    if (!tree) {
	tree = NEW_NIL(&NULL_LOC);
    }
    else {
	VALUE opt = p->compile_option;
	NODE *prelude;
	NODE *body = parser_append_options(p, tree->nd_body);
	if (!opt) opt = rb_obj_hide(rb_ident_hash_new());
	rb_hash_aset(opt, rb_sym_intern_ascii_cstr("coverage_enabled"), cov);
	prelude = block_append(p, p->eval_tree_begin, body);
	tree->nd_body = prelude;
        RB_OBJ_WRITE(p->ast, &p->ast->body.compile_option, opt);
    }
    p->ast->body.root = tree;
    p->ast->body.line_count = p->line_count;
    return TRUE;
}

static rb_ast_t *
yycompile(VALUE vparser, struct parser_params *p, VALUE fname, int line)
{
    rb_ast_t *ast;
    if (NIL_P(fname)) {
	p->ruby_sourcefile_string = Qnil;
	p->ruby_sourcefile = "(none)";
    }
    else {
	p->ruby_sourcefile_string = rb_fstring(fname);
	p->ruby_sourcefile = StringValueCStr(fname);
    }
    p->ruby_sourceline = line - 1;

    p->ast = ast = rb_ast_new();
    rb_suppress_tracing(yycompile0, (VALUE)p);
    p->ast = 0;
    RB_GC_GUARD(vparser); /* prohibit tail call optimization */

    return ast;
}
#endif /* !RIPPER */

static rb_encoding *
must_be_ascii_compatible(VALUE s)
{
    rb_encoding *enc = rb_enc_get(s);
    if (!rb_enc_asciicompat(enc)) {
	rb_raise(rb_eArgError, "invalid source encoding");
    }
    return enc;
}

static VALUE
lex_get_str(struct parser_params *p, VALUE s)
{
    char *beg, *end, *start;
    long len;

    beg = RSTRING_PTR(s);
    len = RSTRING_LEN(s);
    start = beg;
    if (p->lex.gets_.ptr) {
	if (len == p->lex.gets_.ptr) return Qnil;
	beg += p->lex.gets_.ptr;
	len -= p->lex.gets_.ptr;
    }
    end = memchr(beg, '\n', len);
    if (end) len = ++end - beg;
    p->lex.gets_.ptr += len;
    return rb_str_subseq(s, beg - start, len);
}

static VALUE
lex_getline(struct parser_params *p)
{
    VALUE line = (*p->lex.gets)(p, p->lex.input);
    if (NIL_P(line)) return line;
    must_be_ascii_compatible(line);
#ifndef RIPPER
    if (p->debug_lines) {
	rb_enc_associate(line, p->enc);
	rb_ary_push(p->debug_lines, line);
    }
#endif
    p->line_count++;
    return line;
}

static const rb_data_type_t parser_data_type;

#ifndef RIPPER
static rb_ast_t*
parser_compile_string(VALUE vparser, VALUE fname, VALUE s, int line)
{
    struct parser_params *p;

    TypedData_Get_Struct(vparser, struct parser_params, &parser_data_type, p);

    p->lex.gets = lex_get_str;
    p->lex.gets_.ptr = 0;
    p->lex.input = rb_str_new_frozen(s);
    p->lex.pbeg = p->lex.pcur = p->lex.pend = 0;

    return yycompile(vparser, p, fname, line);
}

rb_ast_t*
rb_parser_compile_string(VALUE vparser, const char *f, VALUE s, int line)
{
    return rb_parser_compile_string_path(vparser, rb_filesystem_str_new_cstr(f), s, line);
}

rb_ast_t*
rb_parser_compile_string_path(VALUE vparser, VALUE f, VALUE s, int line)
{
    must_be_ascii_compatible(s);
    return parser_compile_string(vparser, f, s, line);
}

VALUE rb_io_gets_internal(VALUE io);

static VALUE
lex_io_gets(struct parser_params *p, VALUE io)
{
    return rb_io_gets_internal(io);
}

rb_ast_t*
rb_parser_compile_file_path(VALUE vparser, VALUE fname, VALUE file, int start)
{
    struct parser_params *p;

    TypedData_Get_Struct(vparser, struct parser_params, &parser_data_type, p);

    p->lex.gets = lex_io_gets;
    p->lex.input = file;
    p->lex.pbeg = p->lex.pcur = p->lex.pend = 0;

    return yycompile(vparser, p, fname, start);
}

static VALUE
lex_generic_gets(struct parser_params *p, VALUE input)
{
    return (*p->lex.gets_.call)(input, p->line_count);
}

rb_ast_t*
rb_parser_compile_generic(VALUE vparser, VALUE (*lex_gets)(VALUE, int), VALUE fname, VALUE input, int start)
{
    struct parser_params *p;

    TypedData_Get_Struct(vparser, struct parser_params, &parser_data_type, p);

    p->lex.gets = lex_generic_gets;
    p->lex.gets_.call = lex_gets;
    p->lex.input = input;
    p->lex.pbeg = p->lex.pcur = p->lex.pend = 0;

    return yycompile(vparser, p, fname, start);
}
#endif  /* !RIPPER */

#define STR_FUNC_ESCAPE 0x01
#define STR_FUNC_EXPAND 0x02
#define STR_FUNC_REGEXP 0x04
#define STR_FUNC_QWORDS 0x08
#define STR_FUNC_SYMBOL 0x10
#define STR_FUNC_INDENT 0x20
#define STR_FUNC_LABEL  0x40
#define STR_FUNC_LIST   0x4000
#define STR_FUNC_TERM   0x8000

enum string_type {
    str_label  = STR_FUNC_LABEL,
    str_squote = (0),
    str_dquote = (STR_FUNC_EXPAND),
    str_xquote = (STR_FUNC_EXPAND),
    str_regexp = (STR_FUNC_REGEXP|STR_FUNC_ESCAPE|STR_FUNC_EXPAND),
    str_sword  = (STR_FUNC_QWORDS|STR_FUNC_LIST),
    str_dword  = (STR_FUNC_QWORDS|STR_FUNC_EXPAND|STR_FUNC_LIST),
    str_ssym   = (STR_FUNC_SYMBOL),
    str_dsym   = (STR_FUNC_SYMBOL|STR_FUNC_EXPAND)
};

static VALUE
parser_str_new(const char *ptr, long len, rb_encoding *enc, int func, rb_encoding *enc0)
{
    VALUE str;

    str = rb_enc_str_new(ptr, len, enc);
    if (!(func & STR_FUNC_REGEXP) && rb_enc_asciicompat(enc)) {
	if (rb_enc_str_coderange(str) == ENC_CODERANGE_7BIT) {
	}
	else if (enc0 == rb_usascii_encoding() && enc != rb_utf8_encoding()) {
	    rb_enc_associate(str, rb_ascii8bit_encoding());
	}
    }

    return str;
}

#define lex_goto_eol(p) ((p)->lex.pcur = (p)->lex.pend)
#define lex_eol_p(p) ((p)->lex.pcur >= (p)->lex.pend)
#define lex_eol_n_p(p,n) ((p)->lex.pcur+(n) >= (p)->lex.pend)
#define peek(p,c) peek_n(p, (c), 0)
#define peek_n(p,c,n) (!lex_eol_n_p(p, n) && (c) == (unsigned char)(p)->lex.pcur[n])
#define peekc(p) peekc_n(p, 0)
#define peekc_n(p,n) (lex_eol_n_p(p, n) ? -1 : (unsigned char)(p)->lex.pcur[n])

#ifdef RIPPER
static void
add_delayed_token(struct parser_params *p, const char *tok, const char *end)
{
    if (tok < end) {
	if (!has_delayed_token(p)) {
	    p->delayed.token = rb_str_buf_new(end - tok);
	    rb_enc_associate(p->delayed.token, p->enc);
	    p->delayed.line = p->ruby_sourceline;
	    p->delayed.col = rb_long2int(tok - p->lex.pbeg);
	}
	rb_str_buf_cat(p->delayed.token, tok, end - tok);
	p->lex.ptok = end;
    }
}
#else
#define add_delayed_token(p, tok, end) ((void)(tok), (void)(end))
#endif

static int
nextline(struct parser_params *p)
{
    VALUE v = p->lex.nextline;
    p->lex.nextline = 0;
    if (!v) {
	if (p->eofp)
	    return -1;

	if (p->lex.pend > p->lex.pbeg && *(p->lex.pend-1) != '\n') {
	    goto end_of_input;
	}

	if (!p->lex.input || NIL_P(v = lex_getline(p))) {
	  end_of_input:
	    p->eofp = 1;
	    lex_goto_eol(p);
	    return -1;
	}
	p->cr_seen = FALSE;
    }
    else if (NIL_P(v)) {
	/* after here-document without terminator */
	goto end_of_input;
    }
    add_delayed_token(p, p->lex.ptok, p->lex.pend);
    if (p->heredoc_end > 0) {
	p->ruby_sourceline = p->heredoc_end;
	p->heredoc_end = 0;
    }
    p->ruby_sourceline++;
    p->lex.pbeg = p->lex.pcur = RSTRING_PTR(v);
    p->lex.pend = p->lex.pcur + RSTRING_LEN(v);
    token_flush(p);
    p->lex.prevline = p->lex.lastline;
    p->lex.lastline = v;
    return 0;
}

static int
parser_cr(struct parser_params *p, int c)
{
    if (peek(p, '\n')) {
	p->lex.pcur++;
	c = '\n';
    }
    return c;
}

static inline int
nextc(struct parser_params *p)
{
    int c;

    if (UNLIKELY((p->lex.pcur == p->lex.pend) || p->eofp || RTEST(p->lex.nextline))) {
	if (nextline(p)) return -1;
    }
    c = (unsigned char)*p->lex.pcur++;
    if (UNLIKELY(c == '\r')) {
	c = parser_cr(p, c);
    }

    return c;
}

static void
pushback(struct parser_params *p, int c)
{
    if (c == -1) return;
    p->lex.pcur--;
    if (p->lex.pcur > p->lex.pbeg && p->lex.pcur[0] == '\n' && p->lex.pcur[-1] == '\r') {
	p->lex.pcur--;
    }
}

#define was_bol(p) ((p)->lex.pcur == (p)->lex.pbeg + 1)

#define tokfix(p) ((p)->tokenbuf[(p)->tokidx]='\0')
#define tok(p) (p)->tokenbuf
#define toklen(p) (p)->tokidx

static int
looking_at_eol_p(struct parser_params *p)
{
    const char *ptr = p->lex.pcur;
    while (ptr < p->lex.pend) {
	int c = (unsigned char)*ptr++;
	int eol = (c == '\n' || c == '#');
	if (eol || !ISSPACE(c)) {
	    return eol;
	}
    }
    return TRUE;
}

static char*
newtok(struct parser_params *p)
{
    p->tokidx = 0;
    p->tokline = p->ruby_sourceline;
    if (!p->tokenbuf) {
	p->toksiz = 60;
	p->tokenbuf = ALLOC_N(char, 60);
    }
    if (p->toksiz > 4096) {
	p->toksiz = 60;
	REALLOC_N(p->tokenbuf, char, 60);
    }
    return p->tokenbuf;
}

static char *
tokspace(struct parser_params *p, int n)
{
    p->tokidx += n;

    if (p->tokidx >= p->toksiz) {
	do {p->toksiz *= 2;} while (p->toksiz < p->tokidx);
	REALLOC_N(p->tokenbuf, char, p->toksiz);
    }
    return &p->tokenbuf[p->tokidx-n];
}

static void
tokadd(struct parser_params *p, int c)
{
    p->tokenbuf[p->tokidx++] = (char)c;
    if (p->tokidx >= p->toksiz) {
	p->toksiz *= 2;
	REALLOC_N(p->tokenbuf, char, p->toksiz);
    }
}

static int
tok_hex(struct parser_params *p, size_t *numlen)
{
    int c;

    c = scan_hex(p->lex.pcur, 2, numlen);
    if (!*numlen) {
	yyerror0("invalid hex escape");
	token_flush(p);
	return 0;
    }
    p->lex.pcur += *numlen;
    return c;
}

#define tokcopy(p, n) memcpy(tokspace(p, n), (p)->lex.pcur - (n), (n))

static int
escaped_control_code(int c)
{
    int c2 = 0;
    switch (c) {
      case ' ':
	c2 = 's';
	break;
      case '\n':
	c2 = 'n';
	break;
      case '\t':
	c2 = 't';
	break;
      case '\v':
	c2 = 'v';
	break;
      case '\r':
	c2 = 'r';
	break;
      case '\f':
	c2 = 'f';
	break;
    }
    return c2;
}

#define WARN_SPACE_CHAR(c, prefix) \
    rb_warn1("invalid character syntax; use "prefix"\\%c", WARN_I(c2))

static int
tokadd_codepoint(struct parser_params *p, rb_encoding **encp,
		 int regexp_literal, int wide)
{
    size_t numlen;
    int codepoint = scan_hex(p->lex.pcur, wide ? p->lex.pend - p->lex.pcur : 4, &numlen);
    literal_flush(p, p->lex.pcur);
    p->lex.pcur += numlen;
    if (wide ? (numlen == 0 || numlen > 6) : (numlen < 4))  {
	yyerror0("invalid Unicode escape");
	return wide && numlen > 0;
    }
    if (codepoint > 0x10ffff) {
	yyerror0("invalid Unicode codepoint (too large)");
	return wide;
    }
    if ((codepoint & 0xfffff800) == 0xd800) {
	yyerror0("invalid Unicode codepoint");
	return wide;
    }
    if (regexp_literal) {
	tokcopy(p, (int)numlen);
    }
    else if (codepoint >= 0x80) {
	rb_encoding *utf8 = rb_utf8_encoding();
	if (*encp && utf8 != *encp) {
	    YYLTYPE loc = RUBY_INIT_YYLLOC();
	    compile_error(p, "UTF-8 mixed within %s source", rb_enc_name(*encp));
	    parser_show_error_line(p, &loc);
	    return wide;
	}
	*encp = utf8;
	tokaddmbc(p, codepoint, *encp);
    }
    else {
	tokadd(p, codepoint);
    }
    return TRUE;
}

/* return value is for ?\u3042 */
static void
tokadd_utf8(struct parser_params *p, rb_encoding **encp,
	    int term, int symbol_literal, int regexp_literal)
{
    /*
     * If `term` is not -1, then we allow multiple codepoints in \u{}
     * upto `term` byte, otherwise we're parsing a character literal.
     * And then add the codepoints to the current token.
     */
    static const char multiple_codepoints[] = "Multiple codepoints at single character literal";

    const int open_brace = '{', close_brace = '}';

    if (regexp_literal) { tokadd(p, '\\'); tokadd(p, 'u'); }

    if (peek(p, open_brace)) {  /* handle \u{...} form */
	const char *second = NULL;
	int c, last = nextc(p);
	if (p->lex.pcur >= p->lex.pend) goto unterminated;
	while (ISSPACE(c = *p->lex.pcur) && ++p->lex.pcur < p->lex.pend);
	while (c != close_brace) {
	    if (c == term) goto unterminated;
	    if (second == multiple_codepoints)
		second = p->lex.pcur;
	    if (regexp_literal) tokadd(p, last);
	    if (!tokadd_codepoint(p, encp, regexp_literal, TRUE)) {
		break;
	    }
	    while (ISSPACE(c = *p->lex.pcur)) {
		if (++p->lex.pcur >= p->lex.pend) goto unterminated;
		last = c;
	    }
	    if (term == -1 && !second)
		second = multiple_codepoints;
	}

	if (c != close_brace) {
	  unterminated:
	    token_flush(p);
	    yyerror0("unterminated Unicode escape");
	    return;
	}
	if (second && second != multiple_codepoints) {
	    const char *pcur = p->lex.pcur;
	    p->lex.pcur = second;
	    dispatch_scan_event(p, tSTRING_CONTENT);
	    token_flush(p);
	    p->lex.pcur = pcur;
	    yyerror0(multiple_codepoints);
	    token_flush(p);
	}

	if (regexp_literal) tokadd(p, close_brace);
	nextc(p);
    }
    else {			/* handle \uxxxx form */
	if (!tokadd_codepoint(p, encp, regexp_literal, FALSE)) {
	    token_flush(p);
	    return;
	}
    }
}

#define ESCAPE_CONTROL 1
#define ESCAPE_META    2

static int
read_escape(struct parser_params *p, int flags, rb_encoding **encp)
{
    int c;
    size_t numlen;

    switch (c = nextc(p)) {
      case '\\':	/* Backslash */
	return c;

      case 'n':	/* newline */
	return '\n';

      case 't':	/* horizontal tab */
	return '\t';

      case 'r':	/* carriage-return */
	return '\r';

      case 'f':	/* form-feed */
	return '\f';

      case 'v':	/* vertical tab */
	return '\13';

      case 'a':	/* alarm(bell) */
	return '\007';

      case 'e':	/* escape */
	return 033;

      case '0': case '1': case '2': case '3': /* octal constant */
      case '4': case '5': case '6': case '7':
	pushback(p, c);
	c = scan_oct(p->lex.pcur, 3, &numlen);
	p->lex.pcur += numlen;
	return c;

      case 'x':	/* hex constant */
	c = tok_hex(p, &numlen);
	if (numlen == 0) return 0;
	return c;

      case 'b':	/* backspace */
	return '\010';

      case 's':	/* space */
	return ' ';

      case 'M':
	if (flags & ESCAPE_META) goto eof;
	if ((c = nextc(p)) != '-') {
	    goto eof;
	}
	if ((c = nextc(p)) == '\\') {
	    if (peek(p, 'u')) goto eof;
	    return read_escape(p, flags|ESCAPE_META, encp) | 0x80;
	}
	else if (c == -1 || !ISASCII(c)) goto eof;
	else {
	    int c2 = escaped_control_code(c);
	    if (c2) {
		if (ISCNTRL(c) || !(flags & ESCAPE_CONTROL)) {
		    WARN_SPACE_CHAR(c2, "\\M-");
		}
		else {
		    WARN_SPACE_CHAR(c2, "\\C-\\M-");
		}
	    }
	    else if (ISCNTRL(c)) goto eof;
	    return ((c & 0xff) | 0x80);
	}

      case 'C':
	if ((c = nextc(p)) != '-') {
	    goto eof;
	}
      case 'c':
	if (flags & ESCAPE_CONTROL) goto eof;
	if ((c = nextc(p))== '\\') {
	    if (peek(p, 'u')) goto eof;
	    c = read_escape(p, flags|ESCAPE_CONTROL, encp);
	}
	else if (c == '?')
	    return 0177;
	else if (c == -1 || !ISASCII(c)) goto eof;
	else {
	    int c2 = escaped_control_code(c);
	    if (c2) {
		if (ISCNTRL(c)) {
		    if (flags & ESCAPE_META) {
			WARN_SPACE_CHAR(c2, "\\M-");
		    }
		    else {
			WARN_SPACE_CHAR(c2, "");
		    }
		}
		else {
		    if (flags & ESCAPE_META) {
			WARN_SPACE_CHAR(c2, "\\M-\\C-");
		    }
		    else {
			WARN_SPACE_CHAR(c2, "\\C-");
		    }
		}
	    }
	    else if (ISCNTRL(c)) goto eof;
	}
	return c & 0x9f;

      eof:
      case -1:
        yyerror0("Invalid escape character syntax");
	token_flush(p);
	return '\0';

      default:
	return c;
    }
}

static void
tokaddmbc(struct parser_params *p, int c, rb_encoding *enc)
{
    int len = rb_enc_codelen(c, enc);
    rb_enc_mbcput(c, tokspace(p, len), enc);
}

static int
tokadd_escape(struct parser_params *p, rb_encoding **encp)
{
    int c;
    int flags = 0;
    size_t numlen;

  first:
    switch (c = nextc(p)) {
      case '\n':
	return 0;		/* just ignore */

      case '0': case '1': case '2': case '3': /* octal constant */
      case '4': case '5': case '6': case '7':
	{
	    ruby_scan_oct(--p->lex.pcur, 3, &numlen);
	    if (numlen == 0) goto eof;
	    p->lex.pcur += numlen;
	    tokcopy(p, (int)numlen + 1);
	}
	return 0;

      case 'x':	/* hex constant */
	{
	    tok_hex(p, &numlen);
	    if (numlen == 0) return -1;
	    tokcopy(p, (int)numlen + 2);
	}
	return 0;

      case 'M':
	if (flags & ESCAPE_META) goto eof;
	if ((c = nextc(p)) != '-') {
	    pushback(p, c);
	    goto eof;
	}
	tokcopy(p, 3);
	flags |= ESCAPE_META;
	goto escaped;

      case 'C':
	if (flags & ESCAPE_CONTROL) goto eof;
	if ((c = nextc(p)) != '-') {
	    pushback(p, c);
	    goto eof;
	}
	tokcopy(p, 3);
	goto escaped;

      case 'c':
	if (flags & ESCAPE_CONTROL) goto eof;
	tokcopy(p, 2);
	flags |= ESCAPE_CONTROL;
      escaped:
	if ((c = nextc(p)) == '\\') {
	    goto first;
	}
	else if (c == -1) goto eof;
	tokadd(p, c);
	return 0;

      eof:
      case -1:
        yyerror0("Invalid escape character syntax");
	token_flush(p);
	return -1;

      default:
	tokadd(p, '\\');
	tokadd(p, c);
    }
    return 0;
}

static int
regx_options(struct parser_params *p)
{
    int kcode = 0;
    int kopt = 0;
    int options = 0;
    int c, opt, kc;

    newtok(p);
    while (c = nextc(p), ISALPHA(c)) {
        if (c == 'o') {
            options |= RE_OPTION_ONCE;
        }
        else if (rb_char_to_option_kcode(c, &opt, &kc)) {
	    if (kc >= 0) {
		if (kc != rb_ascii8bit_encindex()) kcode = c;
		kopt = opt;
	    }
	    else {
		options |= opt;
	    }
        }
        else {
	    tokadd(p, c);
        }
    }
    options |= kopt;
    pushback(p, c);
    if (toklen(p)) {
	YYLTYPE loc = RUBY_INIT_YYLLOC();
	tokfix(p);
	compile_error(p, "unknown regexp option%s - %*s",
		      toklen(p) > 1 ? "s" : "", toklen(p), tok(p));
	parser_show_error_line(p, &loc);
    }
    return options | RE_OPTION_ENCODING(kcode);
}

static int
tokadd_mbchar(struct parser_params *p, int c)
{
    int len = parser_precise_mbclen(p, p->lex.pcur-1);
    if (len < 0) return -1;
    tokadd(p, c);
    p->lex.pcur += --len;
    if (len > 0) tokcopy(p, len);
    return c;
}

static inline int
simple_re_meta(int c)
{
    switch (c) {
      case '$': case '*': case '+': case '.':
      case '?': case '^': case '|':
      case ')': case ']': case '}': case '>':
	return TRUE;
      default:
	return FALSE;
    }
}

static int
parser_update_heredoc_indent(struct parser_params *p, int c)
{
    if (p->heredoc_line_indent == -1) {
	if (c == '\n') p->heredoc_line_indent = 0;
    }
    else {
	if (c == ' ') {
	    p->heredoc_line_indent++;
	    return TRUE;
	}
	else if (c == '\t') {
	    int w = (p->heredoc_line_indent / TAB_WIDTH) + 1;
	    p->heredoc_line_indent = w * TAB_WIDTH;
	    return TRUE;
	}
	else if (c != '\n') {
	    if (p->heredoc_indent > p->heredoc_line_indent) {
		p->heredoc_indent = p->heredoc_line_indent;
	    }
	    p->heredoc_line_indent = -1;
	}
    }
    return FALSE;
}

static void
parser_mixed_error(struct parser_params *p, rb_encoding *enc1, rb_encoding *enc2)
{
    YYLTYPE loc = RUBY_INIT_YYLLOC();
    const char *n1 = rb_enc_name(enc1), *n2 = rb_enc_name(enc2);
    compile_error(p, "%s mixed within %s source", n1, n2);
    parser_show_error_line(p, &loc);
}

static void
parser_mixed_escape(struct parser_params *p, const char *beg, rb_encoding *enc1, rb_encoding *enc2)
{
    const char *pos = p->lex.pcur;
    p->lex.pcur = beg;
    parser_mixed_error(p, enc1, enc2);
    p->lex.pcur = pos;
}

static int
tokadd_string(struct parser_params *p,
	      int func, int term, int paren, long *nest,
	      rb_encoding **encp, rb_encoding **enc)
{
    int c;
    bool erred = false;

#define mixed_error(enc1, enc2) \
    (void)(erred || (parser_mixed_error(p, enc1, enc2), erred = true))
#define mixed_escape(beg, enc1, enc2) \
    (void)(erred || (parser_mixed_escape(p, beg, enc1, enc2), erred = true))

    while ((c = nextc(p)) != -1) {
	if (p->heredoc_indent > 0) {
	    parser_update_heredoc_indent(p, c);
	}

	if (paren && c == paren) {
	    ++*nest;
	}
	else if (c == term) {
	    if (!nest || !*nest) {
		pushback(p, c);
		break;
	    }
	    --*nest;
	}
	else if ((func & STR_FUNC_EXPAND) && c == '#' && p->lex.pcur < p->lex.pend) {
	    int c2 = *p->lex.pcur;
	    if (c2 == '$' || c2 == '@' || c2 == '{') {
		pushback(p, c);
		break;
	    }
	}
	else if (c == '\\') {
	    literal_flush(p, p->lex.pcur - 1);
	    c = nextc(p);
	    switch (c) {
	      case '\n':
		if (func & STR_FUNC_QWORDS) break;
		if (func & STR_FUNC_EXPAND) {
		    if (!(func & STR_FUNC_INDENT) || (p->heredoc_indent < 0))
			continue;
		    if (c == term) {
			c = '\\';
			goto terminate;
		    }
		}
		tokadd(p, '\\');
		break;

	      case '\\':
		if (func & STR_FUNC_ESCAPE) tokadd(p, c);
		break;

	      case 'u':
		if ((func & STR_FUNC_EXPAND) == 0) {
		    tokadd(p, '\\');
		    break;
		}
		tokadd_utf8(p, enc, term,
			    func & STR_FUNC_SYMBOL,
			    func & STR_FUNC_REGEXP);
		continue;

	      default:
		if (c == -1) return -1;
		if (!ISASCII(c)) {
		    if ((func & STR_FUNC_EXPAND) == 0) tokadd(p, '\\');
		    goto non_ascii;
		}
		if (func & STR_FUNC_REGEXP) {
		    if (c == term && !simple_re_meta(c)) {
			tokadd(p, c);
			continue;
		    }
		    pushback(p, c);
		    if ((c = tokadd_escape(p, enc)) < 0)
			return -1;
		    if (*enc && *enc != *encp) {
			mixed_escape(p->lex.ptok+2, *enc, *encp);
		    }
		    continue;
		}
		else if (func & STR_FUNC_EXPAND) {
		    pushback(p, c);
		    if (func & STR_FUNC_ESCAPE) tokadd(p, '\\');
		    c = read_escape(p, 0, enc);
		}
		else if ((func & STR_FUNC_QWORDS) && ISSPACE(c)) {
		    /* ignore backslashed spaces in %w */
		}
		else if (c != term && !(paren && c == paren)) {
		    tokadd(p, '\\');
		    pushback(p, c);
		    continue;
		}
	    }
	}
	else if (!parser_isascii(p)) {
	  non_ascii:
	    if (!*enc) {
		*enc = *encp;
	    }
	    else if (*enc != *encp) {
		mixed_error(*enc, *encp);
		continue;
	    }
	    if (tokadd_mbchar(p, c) == -1) return -1;
	    continue;
	}
	else if ((func & STR_FUNC_QWORDS) && ISSPACE(c)) {
	    pushback(p, c);
	    break;
	}
        if (c & 0x80) {
	    if (!*enc) {
		*enc = *encp;
	    }
	    else if (*enc != *encp) {
		mixed_error(*enc, *encp);
		continue;
	    }
        }
	tokadd(p, c);
    }
  terminate:
    if (*enc) *encp = *enc;
    return c;
}

static inline rb_strterm_t *
new_strterm(VALUE v1, VALUE v2, VALUE v3, VALUE v0)
{
    return (rb_strterm_t*)rb_imemo_new(imemo_parser_strterm, v1, v2, v3, v0);
}

/* imemo_parser_strterm for literal */
#define NEW_STRTERM(func, term, paren) \
    new_strterm((VALUE)(func), (VALUE)(paren), (VALUE)(term), 0)

#ifdef RIPPER
static void
flush_string_content(struct parser_params *p, rb_encoding *enc)
{
    VALUE content = yylval.val;
    if (!ripper_is_node_yylval(content))
	content = ripper_new_yylval(p, 0, 0, content);
    if (has_delayed_token(p)) {
	ptrdiff_t len = p->lex.pcur - p->lex.ptok;
	if (len > 0) {
	    rb_enc_str_buf_cat(p->delayed.token, p->lex.ptok, len, enc);
	}
	dispatch_delayed_token(p, tSTRING_CONTENT);
	p->lex.ptok = p->lex.pcur;
	RNODE(content)->nd_rval = yylval.val;
    }
    dispatch_scan_event(p, tSTRING_CONTENT);
    if (yylval.val != content)
	RNODE(content)->nd_rval = yylval.val;
    yylval.val = content;
}
#else
#define flush_string_content(p, enc) ((void)(enc))
#endif

RUBY_FUNC_EXPORTED const unsigned int ruby_global_name_punct_bits[(0x7e - 0x20 + 31) / 32];
/* this can be shared with ripper, since it's independent from struct
 * parser_params. */
#ifndef RIPPER
#define BIT(c, idx) (((c) / 32 - 1 == idx) ? (1U << ((c) % 32)) : 0)
#define SPECIAL_PUNCT(idx) ( \
	BIT('~', idx) | BIT('*', idx) | BIT('$', idx) | BIT('?', idx) | \
	BIT('!', idx) | BIT('@', idx) | BIT('/', idx) | BIT('\\', idx) | \
	BIT(';', idx) | BIT(',', idx) | BIT('.', idx) | BIT('=', idx) | \
	BIT(':', idx) | BIT('<', idx) | BIT('>', idx) | BIT('\"', idx) | \
	BIT('&', idx) | BIT('`', idx) | BIT('\'', idx) | BIT('+', idx) | \
	BIT('0', idx))
const unsigned int ruby_global_name_punct_bits[] = {
    SPECIAL_PUNCT(0),
    SPECIAL_PUNCT(1),
    SPECIAL_PUNCT(2),
};
#undef BIT
#undef SPECIAL_PUNCT
#endif

static enum yytokentype
parser_peek_variable_name(struct parser_params *p)
{
    int c;
    const char *ptr = p->lex.pcur;

    if (ptr + 1 >= p->lex.pend) return 0;
    c = *ptr++;
    switch (c) {
      case '$':
	if ((c = *ptr) == '-') {
	    if (++ptr >= p->lex.pend) return 0;
	    c = *ptr;
	}
	else if (is_global_name_punct(c) || ISDIGIT(c)) {
	    return tSTRING_DVAR;
	}
	break;
      case '@':
	if ((c = *ptr) == '@') {
	    if (++ptr >= p->lex.pend) return 0;
	    c = *ptr;
	}
	break;
      case '{':
	p->lex.pcur = ptr;
	p->command_start = TRUE;
	return tSTRING_DBEG;
      default:
	return 0;
    }
    if (!ISASCII(c) || c == '_' || ISALPHA(c))
	return tSTRING_DVAR;
    return 0;
}

#define IS_ARG() IS_lex_state(EXPR_ARG_ANY)
#define IS_END() IS_lex_state(EXPR_END_ANY)
#define IS_BEG() (IS_lex_state(EXPR_BEG_ANY) || IS_lex_state_all(EXPR_ARG|EXPR_LABELED))
#define IS_SPCARG(c) (IS_ARG() && space_seen && !ISSPACE(c))
#define IS_LABEL_POSSIBLE() (\
	(IS_lex_state(EXPR_LABEL|EXPR_ENDFN) && !cmd_state) || \
	IS_ARG())
#define IS_LABEL_SUFFIX(n) (peek_n(p, ':',(n)) && !peek_n(p, ':', (n)+1))
#define IS_AFTER_OPERATOR() IS_lex_state(EXPR_FNAME | EXPR_DOT)

static inline enum yytokentype
parser_string_term(struct parser_params *p, int func)
{
    p->lex.strterm = 0;
    if (func & STR_FUNC_REGEXP) {
	set_yylval_num(regx_options(p));
	dispatch_scan_event(p, tREGEXP_END);
	SET_LEX_STATE(EXPR_END);
	return tREGEXP_END;
    }
    if ((func & STR_FUNC_LABEL) && IS_LABEL_SUFFIX(0)) {
	nextc(p);
	SET_LEX_STATE(EXPR_BEG|EXPR_LABEL);
	return tLABEL_END;
    }
    SET_LEX_STATE(EXPR_END);
    return tSTRING_END;
}

static enum yytokentype
parse_string(struct parser_params *p, rb_strterm_literal_t *quote)
{
    int func = (int)quote->u1.func;
    int term = (int)quote->u3.term;
    int paren = (int)quote->u2.paren;
    int c, space = 0;
    rb_encoding *enc = p->enc;
    rb_encoding *base_enc = 0;
    VALUE lit;

    if (func & STR_FUNC_TERM) {
	if (func & STR_FUNC_QWORDS) nextc(p); /* delayed term */
	SET_LEX_STATE(EXPR_END);
	p->lex.strterm = 0;
	return func & STR_FUNC_REGEXP ? tREGEXP_END : tSTRING_END;
    }
    c = nextc(p);
    if ((func & STR_FUNC_QWORDS) && ISSPACE(c)) {
	do {c = nextc(p);} while (ISSPACE(c));
	space = 1;
    }
    if (func & STR_FUNC_LIST) {
	quote->u1.func &= ~STR_FUNC_LIST;
	space = 1;
    }
    if (c == term && !quote->u0.nest) {
	if (func & STR_FUNC_QWORDS) {
	    quote->u1.func |= STR_FUNC_TERM;
	    pushback(p, c); /* dispatch the term at tSTRING_END */
	    add_delayed_token(p, p->lex.ptok, p->lex.pcur);
	    return ' ';
	}
	return parser_string_term(p, func);
    }
    if (space) {
	pushback(p, c);
	add_delayed_token(p, p->lex.ptok, p->lex.pcur);
	return ' ';
    }
    newtok(p);
    if ((func & STR_FUNC_EXPAND) && c == '#') {
	int t = parser_peek_variable_name(p);
	if (t) return t;
	tokadd(p, '#');
	c = nextc(p);
    }
    pushback(p, c);
    if (tokadd_string(p, func, term, paren, &quote->u0.nest,
		      &enc, &base_enc) == -1) {
	if (p->eofp) {
#ifndef RIPPER
# define unterminated_literal(mesg) yyerror0(mesg)
#else
# define unterminated_literal(mesg) compile_error(p,  mesg)
#endif
	    literal_flush(p, p->lex.pcur);
	    if (func & STR_FUNC_QWORDS) {
		/* no content to add, bailing out here */
		unterminated_literal("unterminated list meets end of file");
		p->lex.strterm = 0;
		return tSTRING_END;
	    }
	    if (func & STR_FUNC_REGEXP) {
		unterminated_literal("unterminated regexp meets end of file");
	    }
	    else {
		unterminated_literal("unterminated string meets end of file");
	    }
	    quote->u1.func |= STR_FUNC_TERM;
	}
    }

    tokfix(p);
    lit = STR_NEW3(tok(p), toklen(p), enc, func);
    set_yylval_str(lit);
    flush_string_content(p, enc);

    return tSTRING_CONTENT;
}

static enum yytokentype
heredoc_identifier(struct parser_params *p)
{
    /*
     * term_len is length of `<<"END"` except `END`,
     * in this case term_len is 4 (<, <, " and ").
     */
    long len, offset = p->lex.pcur - p->lex.pbeg;
    int c = nextc(p), term, func = 0, quote = 0;
    enum yytokentype token = tSTRING_BEG;
    int indent = 0;

    if (c == '-') {
	c = nextc(p);
	func = STR_FUNC_INDENT;
	offset++;
    }
    else if (c == '~') {
	c = nextc(p);
	func = STR_FUNC_INDENT;
	offset++;
	indent = INT_MAX;
    }
    switch (c) {
      case '\'':
	func |= str_squote; goto quoted;
      case '"':
	func |= str_dquote; goto quoted;
      case '`':
	token = tXSTRING_BEG;
	func |= str_xquote; goto quoted;

      quoted:
	quote++;
	offset++;
	term = c;
	len = 0;
	while ((c = nextc(p)) != term) {
	    if (c == -1 || c == '\r' || c == '\n') {
		yyerror(NULL, p, "unterminated here document identifier");
		return -1;
	    }
	}
	break;

      default:
	if (!parser_is_identchar(p)) {
	    pushback(p, c);
	    if (func & STR_FUNC_INDENT) {
		pushback(p, indent > 0 ? '~' : '-');
	    }
	    return 0;
	}
	func |= str_dquote;
	do {
	    int n = parser_precise_mbclen(p, p->lex.pcur-1);
	    if (n < 0) return 0;
	    p->lex.pcur += --n;
	} while ((c = nextc(p)) != -1 && parser_is_identchar(p));
	pushback(p, c);
	break;
    }

    len = p->lex.pcur - (p->lex.pbeg + offset) - quote;
    if ((unsigned long)len >= HERETERM_LENGTH_MAX)
	yyerror(NULL, p, "too long here document identifier");
    dispatch_scan_event(p, tHEREDOC_BEG);
    lex_goto_eol(p);

    p->lex.strterm = new_strterm(0, 0, 0, p->lex.lastline);
    p->lex.strterm->flags |= STRTERM_HEREDOC;
    rb_strterm_heredoc_t *here = &p->lex.strterm->u.heredoc;
    here->offset = offset;
    here->sourceline = p->ruby_sourceline;
    here->length = (int)len;
    here->quote = quote;
    here->func = func;

    token_flush(p);
    p->heredoc_indent = indent;
    p->heredoc_line_indent = 0;
    return token;
}

static void
heredoc_restore(struct parser_params *p, rb_strterm_heredoc_t *here)
{
    VALUE line;

    p->lex.strterm = 0;
    line = here->lastline;
    p->lex.lastline = line;
    p->lex.pbeg = RSTRING_PTR(line);
    p->lex.pend = p->lex.pbeg + RSTRING_LEN(line);
    p->lex.pcur = p->lex.pbeg + here->offset + here->length + here->quote;
    p->lex.ptok = p->lex.pbeg + here->offset - here->quote;
    p->heredoc_end = p->ruby_sourceline;
    p->ruby_sourceline = (int)here->sourceline;
    if (p->eofp) p->lex.nextline = Qnil;
    p->eofp = 0;
}

static int
dedent_string(VALUE string, int width)
{
    char *str;
    long len;
    int i, col = 0;

    RSTRING_GETMEM(string, str, len);
    for (i = 0; i < len && col < width; i++) {
	if (str[i] == ' ') {
	    col++;
	}
	else if (str[i] == '\t') {
	    int n = TAB_WIDTH * (col / TAB_WIDTH + 1);
	    if (n > width) break;
	    col = n;
	}
	else {
	    break;
	}
    }
    if (!i) return 0;
    rb_str_modify(string);
    str = RSTRING_PTR(string);
    if (RSTRING_LEN(string) != len)
	rb_fatal("literal string changed: %+"PRIsVALUE, string);
    MEMMOVE(str, str + i, char, len - i);
    rb_str_set_len(string, len - i);
    return i;
}

#ifndef RIPPER
static NODE *
heredoc_dedent(struct parser_params *p, NODE *root)
{
    NODE *node, *str_node, *prev_node;
    int indent = p->heredoc_indent;
    VALUE prev_lit = 0;

    if (indent <= 0) return root;
    p->heredoc_indent = 0;
    if (!root) return root;

    prev_node = node = str_node = root;
    if (nd_type(root) == NODE_LIST) str_node = root->nd_head;

    while (str_node) {
	VALUE lit = str_node->nd_lit;
	if (str_node->flags & NODE_FL_NEWLINE) {
	    dedent_string(lit, indent);
	}
	if (!prev_lit) {
	    prev_lit = lit;
	}
	else if (!literal_concat0(p, prev_lit, lit)) {
	    return 0;
	}
	else {
	    NODE *end = node->nd_end;
	    node = prev_node->nd_next = node->nd_next;
	    if (!node) {
		if (nd_type(prev_node) == NODE_DSTR)
		    nd_set_type(prev_node, NODE_STR);
		break;
	    }
	    node->nd_end = end;
	    goto next_str;
	}

	str_node = 0;
	while ((node = (prev_node = node)->nd_next) != 0) {
	  next_str:
	    if (nd_type(node) != NODE_LIST) break;
	    if ((str_node = node->nd_head) != 0) {
		enum node_type type = nd_type(str_node);
		if (type == NODE_STR || type == NODE_DSTR) break;
		prev_lit = 0;
		str_node = 0;
	    }
	}
    }
    return root;
}
#else /* RIPPER */
static VALUE
heredoc_dedent(struct parser_params *p, VALUE array)
{
    int indent = p->heredoc_indent;

    if (indent <= 0) return array;
    p->heredoc_indent = 0;
    dispatch2(heredoc_dedent, array, INT2NUM(indent));
    return array;
}

/*
 *  call-seq:
 *    Ripper.dedent_string(input, width)   -> Integer
 *
 *  USE OF RIPPER LIBRARY ONLY.
 *
 *  Strips up to +width+ leading whitespaces from +input+,
 *  and returns the stripped column width.
 */
static VALUE
parser_dedent_string(VALUE self, VALUE input, VALUE width)
{
    int wid, col;

    StringValue(input);
    wid = NUM2UINT(width);
    col = dedent_string(input, wid);
    return INT2NUM(col);
}
#endif

static int
whole_match_p(struct parser_params *p, const char *eos, long len, int indent)
{
    const char *ptr = p->lex.pbeg;
    long n;

    if (indent) {
	while (*ptr && ISSPACE(*ptr)) ptr++;
    }
    n = p->lex.pend - (ptr + len);
    if (n < 0) return FALSE;
    if (n > 0 && ptr[len] != '\n') {
	if (ptr[len] != '\r') return FALSE;
	if (n <= 1 || ptr[len+1] != '\n') return FALSE;
    }
    return strncmp(eos, ptr, len) == 0;
}

static int
word_match_p(struct parser_params *p, const char *word, long len)
{
    if (strncmp(p->lex.pcur, word, len)) return 0;
    if (p->lex.pcur + len == p->lex.pend) return 1;
    int c = (unsigned char)p->lex.pcur[len];
    if (ISSPACE(c)) return 1;
    switch (c) {
      case '\0': case '\004': case '\032': return 1;
    }
    return 0;
}

#define NUM_SUFFIX_R   (1<<0)
#define NUM_SUFFIX_I   (1<<1)
#define NUM_SUFFIX_ALL 3

static int
number_literal_suffix(struct parser_params *p, int mask)
{
    int c, result = 0;
    const char *lastp = p->lex.pcur;

    while ((c = nextc(p)) != -1) {
	if ((mask & NUM_SUFFIX_I) && c == 'i') {
	    result |= (mask & NUM_SUFFIX_I);
	    mask &= ~NUM_SUFFIX_I;
	    /* r after i, rational of complex is disallowed */
	    mask &= ~NUM_SUFFIX_R;
	    continue;
	}
	if ((mask & NUM_SUFFIX_R) && c == 'r') {
	    result |= (mask & NUM_SUFFIX_R);
	    mask &= ~NUM_SUFFIX_R;
	    continue;
	}
	if (!ISASCII(c) || ISALPHA(c) || c == '_') {
	    p->lex.pcur = lastp;
	    literal_flush(p, p->lex.pcur);
	    return 0;
	}
	pushback(p, c);
	break;
    }
    return result;
}

static enum yytokentype
set_number_literal(struct parser_params *p, VALUE v,
		   enum yytokentype type, int suffix)
{
    if (suffix & NUM_SUFFIX_I) {
	v = rb_complex_raw(INT2FIX(0), v);
	type = tIMAGINARY;
    }
    set_yylval_literal(v);
    SET_LEX_STATE(EXPR_END);
    return type;
}

static enum yytokentype
set_integer_literal(struct parser_params *p, VALUE v, int suffix)
{
    enum yytokentype type = tINTEGER;
    if (suffix & NUM_SUFFIX_R) {
	v = rb_rational_raw1(v);
	type = tRATIONAL;
    }
    return set_number_literal(p, v, type, suffix);
}

#ifdef RIPPER
static void
dispatch_heredoc_end(struct parser_params *p)
{
    VALUE str;
    if (has_delayed_token(p))
	dispatch_delayed_token(p, tSTRING_CONTENT);
    str = STR_NEW(p->lex.ptok, p->lex.pend - p->lex.ptok);
    ripper_dispatch1(p, ripper_token2eventid(tHEREDOC_END), str);
    lex_goto_eol(p);
    token_flush(p);
}

#else
#define dispatch_heredoc_end(p) ((void)0)
#endif

static enum yytokentype
here_document(struct parser_params *p, rb_strterm_heredoc_t *here)
{
    int c, func, indent = 0;
    const char *eos, *ptr, *ptr_end;
    long len;
    VALUE str = 0;
    rb_encoding *enc = p->enc;
    rb_encoding *base_enc = 0;
    int bol;

    eos = RSTRING_PTR(here->lastline) + here->offset;
    len = here->length;
    indent = (func = here->func) & STR_FUNC_INDENT;

    if ((c = nextc(p)) == -1) {
      error:
#ifdef RIPPER
	if (!has_delayed_token(p)) {
	    dispatch_scan_event(p, tSTRING_CONTENT);
	}
	else {
	    if ((len = p->lex.pcur - p->lex.ptok) > 0) {
		if (!(func & STR_FUNC_REGEXP) && rb_enc_asciicompat(enc)) {
		    int cr = ENC_CODERANGE_UNKNOWN;
		    rb_str_coderange_scan_restartable(p->lex.ptok, p->lex.pcur, enc, &cr);
		    if (cr != ENC_CODERANGE_7BIT &&
			p->enc == rb_usascii_encoding() &&
			enc != rb_utf8_encoding()) {
			enc = rb_ascii8bit_encoding();
		    }
		}
		rb_enc_str_buf_cat(p->delayed.token, p->lex.ptok, len, enc);
	    }
	    dispatch_delayed_token(p, tSTRING_CONTENT);
	}
	lex_goto_eol(p);
#endif
	heredoc_restore(p, &p->lex.strterm->u.heredoc);
	compile_error(p, "can't find string \"%.*s\" anywhere before EOF",
		      (int)len, eos);
	token_flush(p);
	p->lex.strterm = 0;
	SET_LEX_STATE(EXPR_END);
	return tSTRING_END;
    }
    bol = was_bol(p);
    if (!bol) {
	/* not beginning of line, cannot be the terminator */
    }
    else if (p->heredoc_line_indent == -1) {
	/* `heredoc_line_indent == -1` means
	 * - "after an interpolation in the same line", or
	 * - "in a continuing line"
	 */
	p->heredoc_line_indent = 0;
    }
    else if (whole_match_p(p, eos, len, indent)) {
	dispatch_heredoc_end(p);
      restore:
	heredoc_restore(p, &p->lex.strterm->u.heredoc);
	token_flush(p);
	p->lex.strterm = 0;
	SET_LEX_STATE(EXPR_END);
	return tSTRING_END;
    }

    if (!(func & STR_FUNC_EXPAND)) {
	do {
	    ptr = RSTRING_PTR(p->lex.lastline);
	    ptr_end = p->lex.pend;
	    if (ptr_end > ptr) {
		switch (ptr_end[-1]) {
		  case '\n':
		    if (--ptr_end == ptr || ptr_end[-1] != '\r') {
			ptr_end++;
			break;
		    }
		  case '\r':
		    --ptr_end;
		}
	    }

	    if (p->heredoc_indent > 0) {
		long i = 0;
		while (ptr + i < ptr_end && parser_update_heredoc_indent(p, ptr[i]))
		    i++;
		p->heredoc_line_indent = 0;
	    }

	    if (str)
		rb_str_cat(str, ptr, ptr_end - ptr);
	    else
		str = STR_NEW(ptr, ptr_end - ptr);
	    if (ptr_end < p->lex.pend) rb_str_cat(str, "\n", 1);
	    lex_goto_eol(p);
	    if (p->heredoc_indent > 0) {
		goto flush_str;
	    }
	    if (nextc(p) == -1) {
		if (str) {
		    str = 0;
		}
		goto error;
	    }
	} while (!whole_match_p(p, eos, len, indent));
    }
    else {
	/*	int mb = ENC_CODERANGE_7BIT, *mbp = &mb;*/
	newtok(p);
	if (c == '#') {
	    int t = parser_peek_variable_name(p);
	    if (p->heredoc_line_indent != -1) {
		if (p->heredoc_indent > p->heredoc_line_indent) {
		    p->heredoc_indent = p->heredoc_line_indent;
		}
		p->heredoc_line_indent = -1;
	    }
	    if (t) return t;
	    tokadd(p, '#');
	    c = nextc(p);
	}
	do {
	    pushback(p, c);
	    enc = p->enc;
	    if ((c = tokadd_string(p, func, '\n', 0, NULL, &enc, &base_enc)) == -1) {
		if (p->eofp) goto error;
		goto restore;
	    }
	    if (c != '\n') {
		if (c == '\\') p->heredoc_line_indent = -1;
	      flush:
		str = STR_NEW3(tok(p), toklen(p), enc, func);
	      flush_str:
		set_yylval_str(str);
#ifndef RIPPER
		if (bol) yylval.node->flags |= NODE_FL_NEWLINE;
#endif
		flush_string_content(p, enc);
		return tSTRING_CONTENT;
	    }
	    tokadd(p, nextc(p));
	    if (p->heredoc_indent > 0) {
		lex_goto_eol(p);
		goto flush;
	    }
	    /*	    if (mbp && mb == ENC_CODERANGE_UNKNOWN) mbp = 0;*/
	    if ((c = nextc(p)) == -1) goto error;
	} while (!whole_match_p(p, eos, len, indent));
	str = STR_NEW3(tok(p), toklen(p), enc, func);
    }
    dispatch_heredoc_end(p);
#ifdef RIPPER
    str = ripper_new_yylval(p, ripper_token2eventid(tSTRING_CONTENT),
			    yylval.val, str);
#endif
    heredoc_restore(p, &p->lex.strterm->u.heredoc);
    token_flush(p);
    p->lex.strterm = NEW_STRTERM(func | STR_FUNC_TERM, 0, 0);
    set_yylval_str(str);
#ifndef RIPPER
    if (bol) yylval.node->flags |= NODE_FL_NEWLINE;
#endif
    return tSTRING_CONTENT;
}

#include "lex.c"

static int
arg_ambiguous(struct parser_params *p, char c)
{
#ifndef RIPPER
    if (c == '/') {
        rb_warning1("ambiguity between regexp and two divisions: wrap regexp in parentheses or add a space after `%c' operator", WARN_I(c));
    }
    else {
        rb_warning1("ambiguous first argument; put parentheses or a space even after `%c' operator", WARN_I(c));
    }
#else
    dispatch1(arg_ambiguous, rb_usascii_str_new(&c, 1));
#endif
    return TRUE;
}

static ID
formal_argument(struct parser_params *p, ID lhs)
{
    switch (id_type(lhs)) {
      case ID_LOCAL:
	break;
#ifndef RIPPER
# define ERR(mesg) yyerror0(mesg)
#else
# define ERR(mesg) (dispatch2(param_error, WARN_S(mesg), lhs), ripper_error(p))
#endif
      case ID_CONST:
	ERR("formal argument cannot be a constant");
	return 0;
      case ID_INSTANCE:
	ERR("formal argument cannot be an instance variable");
	return 0;
      case ID_GLOBAL:
	ERR("formal argument cannot be a global variable");
	return 0;
      case ID_CLASS:
	ERR("formal argument cannot be a class variable");
	return 0;
      default:
	ERR("formal argument must be local variable");
	return 0;
#undef ERR
    }
    shadowing_lvar(p, lhs);
    return lhs;
}

static int
lvar_defined(struct parser_params *p, ID id)
{
    return (dyna_in_block(p) && dvar_defined(p, id)) || local_id(p, id);
}

/* emacsen -*- hack */
static long
parser_encode_length(struct parser_params *p, const char *name, long len)
{
    long nlen;

    if (len > 5 && name[nlen = len - 5] == '-') {
	if (rb_memcicmp(name + nlen + 1, "unix", 4) == 0)
	    return nlen;
    }
    if (len > 4 && name[nlen = len - 4] == '-') {
	if (rb_memcicmp(name + nlen + 1, "dos", 3) == 0)
	    return nlen;
	if (rb_memcicmp(name + nlen + 1, "mac", 3) == 0 &&
	    !(len == 8 && rb_memcicmp(name, "utf8-mac", len) == 0))
	    /* exclude UTF8-MAC because the encoding named "UTF8" doesn't exist in Ruby */
	    return nlen;
    }
    return len;
}

static void
parser_set_encode(struct parser_params *p, const char *name)
{
    int idx = rb_enc_find_index(name);
    rb_encoding *enc;
    VALUE excargs[3];

    if (idx < 0) {
	excargs[1] = rb_sprintf("unknown encoding name: %s", name);
      error:
	excargs[0] = rb_eArgError;
	excargs[2] = rb_make_backtrace();
	rb_ary_unshift(excargs[2], rb_sprintf("%"PRIsVALUE":%d", p->ruby_sourcefile_string, p->ruby_sourceline));
	rb_exc_raise(rb_make_exception(3, excargs));
    }
    enc = rb_enc_from_index(idx);
    if (!rb_enc_asciicompat(enc)) {
	excargs[1] = rb_sprintf("%s is not ASCII compatible", rb_enc_name(enc));
	goto error;
    }
    p->enc = enc;
#ifndef RIPPER
    if (p->debug_lines) {
	VALUE lines = p->debug_lines;
	long i, n = RARRAY_LEN(lines);
	for (i = 0; i < n; ++i) {
	    rb_enc_associate_index(RARRAY_AREF(lines, i), idx);
	}
    }
#endif
}

static int
comment_at_top(struct parser_params *p)
{
    const char *ptr = p->lex.pbeg, *ptr_end = p->lex.pcur - 1;
    if (p->line_count != (p->has_shebang ? 2 : 1)) return 0;
    while (ptr < ptr_end) {
	if (!ISSPACE(*ptr)) return 0;
	ptr++;
    }
    return 1;
}

typedef long (*rb_magic_comment_length_t)(struct parser_params *p, const char *name, long len);
typedef void (*rb_magic_comment_setter_t)(struct parser_params *p, const char *name, const char *val);

static int parser_invalid_pragma_value(struct parser_params *p, const char *name, const char *val);

static void
magic_comment_encoding(struct parser_params *p, const char *name, const char *val)
{
    if (!comment_at_top(p)) {
	return;
    }
    parser_set_encode(p, val);
}

static int
parser_get_bool(struct parser_params *p, const char *name, const char *val)
{
    switch (*val) {
      case 't': case 'T':
	if (STRCASECMP(val, "true") == 0) {
	    return TRUE;
	}
	break;
      case 'f': case 'F':
	if (STRCASECMP(val, "false") == 0) {
	    return FALSE;
	}
	break;
    }
    return parser_invalid_pragma_value(p, name, val);
}

static int
parser_invalid_pragma_value(struct parser_params *p, const char *name, const char *val)
{
    rb_warning2("invalid value for %s: %s", WARN_S(name), WARN_S(val));
    return -1;
}

static void
parser_set_token_info(struct parser_params *p, const char *name, const char *val)
{
    int b = parser_get_bool(p, name, val);
    if (b >= 0) p->token_info_enabled = b;
}

static void
parser_set_compile_option_flag(struct parser_params *p, const char *name, const char *val)
{
    int b;

    if (p->token_seen) {
	rb_warning1("`%s' is ignored after any tokens", WARN_S(name));
	return;
    }

    b = parser_get_bool(p, name, val);
    if (b < 0) return;

    if (!p->compile_option)
	p->compile_option = rb_obj_hide(rb_ident_hash_new());
    rb_hash_aset(p->compile_option, ID2SYM(rb_intern(name)),
		 (b ? Qtrue : Qfalse));
}

static void
parser_set_shareable_constant_value(struct parser_params *p, const char *name, const char *val)
{
    for (const char *s = p->lex.pbeg, *e = p->lex.pcur; s < e; ++s) {
	if (*s == ' ' || *s == '\t') continue;
	if (*s == '#') break;
	rb_warning1("`%s' is ignored unless in comment-only line", WARN_S(name));
	return;
    }

    switch (*val) {
      case 'n': case 'N':
	if (STRCASECMP(val, "none") == 0) {
	    p->ctxt.shareable_constant_value = shareable_none;
	    return;
	}
	break;
      case 'l': case 'L':
	if (STRCASECMP(val, "literal") == 0) {
	    p->ctxt.shareable_constant_value = shareable_literal;
	    return;
	}
	break;
      case 'e': case 'E':
	if (STRCASECMP(val, "experimental_everything") == 0) {
	    p->ctxt.shareable_constant_value = shareable_everything;
	    return;
	}
	break;
    }
    parser_invalid_pragma_value(p, name, val);
}

# if WARN_PAST_SCOPE
static void
parser_set_past_scope(struct parser_params *p, const char *name, const char *val)
{
    int b = parser_get_bool(p, name, val);
    if (b >= 0) p->past_scope_enabled = b;
}
# endif

struct magic_comment {
    const char *name;
    rb_magic_comment_setter_t func;
    rb_magic_comment_length_t length;
};

static const struct magic_comment magic_comments[] = {
    {"coding", magic_comment_encoding, parser_encode_length},
    {"encoding", magic_comment_encoding, parser_encode_length},
    {"frozen_string_literal", parser_set_compile_option_flag},
    {"shareable_constant_value", parser_set_shareable_constant_value},
    {"warn_indent", parser_set_token_info},
# if WARN_PAST_SCOPE
    {"warn_past_scope", parser_set_past_scope},
# endif
};

static const char *
magic_comment_marker(const char *str, long len)
{
    long i = 2;

    while (i < len) {
	switch (str[i]) {
	  case '-':
	    if (str[i-1] == '*' && str[i-2] == '-') {
		return str + i + 1;
	    }
	    i += 2;
	    break;
	  case '*':
	    if (i + 1 >= len) return 0;
	    if (str[i+1] != '-') {
		i += 4;
	    }
	    else if (str[i-1] != '-') {
		i += 2;
	    }
	    else {
		return str + i + 2;
	    }
	    break;
	  default:
	    i += 3;
	    break;
	}
    }
    return 0;
}

static int
parser_magic_comment(struct parser_params *p, const char *str, long len)
{
    int indicator = 0;
    VALUE name = 0, val = 0;
    const char *beg, *end, *vbeg, *vend;
#define str_copy(_s, _p, _n) ((_s) \
	? (void)(rb_str_resize((_s), (_n)), \
	   MEMCPY(RSTRING_PTR(_s), (_p), char, (_n)), (_s)) \
	: (void)((_s) = STR_NEW((_p), (_n))))

    if (len <= 7) return FALSE;
    if (!!(beg = magic_comment_marker(str, len))) {
	if (!(end = magic_comment_marker(beg, str + len - beg)))
	    return FALSE;
	indicator = TRUE;
	str = beg;
	len = end - beg - 3;
    }

    /* %r"([^\\s\'\":;]+)\\s*:\\s*(\"(?:\\\\.|[^\"])*\"|[^\"\\s;]+)[\\s;]*" */
    while (len > 0) {
	const struct magic_comment *mc = magic_comments;
	char *s;
	int i;
	long n = 0;

	for (; len > 0 && *str; str++, --len) {
	    switch (*str) {
	      case '\'': case '"': case ':': case ';':
		continue;
	    }
	    if (!ISSPACE(*str)) break;
	}
	for (beg = str; len > 0; str++, --len) {
	    switch (*str) {
	      case '\'': case '"': case ':': case ';':
		break;
	      default:
		if (ISSPACE(*str)) break;
		continue;
	    }
	    break;
	}
	for (end = str; len > 0 && ISSPACE(*str); str++, --len);
	if (!len) break;
	if (*str != ':') {
	    if (!indicator) return FALSE;
	    continue;
	}

	do str++; while (--len > 0 && ISSPACE(*str));
	if (!len) break;
	if (*str == '"') {
	    for (vbeg = ++str; --len > 0 && *str != '"'; str++) {
		if (*str == '\\') {
		    --len;
		    ++str;
		}
	    }
	    vend = str;
	    if (len) {
		--len;
		++str;
	    }
	}
	else {
	    for (vbeg = str; len > 0 && *str != '"' && *str != ';' && !ISSPACE(*str); --len, str++);
	    vend = str;
	}
	if (indicator) {
	    while (len > 0 && (*str == ';' || ISSPACE(*str))) --len, str++;
	}
	else {
	    while (len > 0 && (ISSPACE(*str))) --len, str++;
	    if (len) return FALSE;
	}

	n = end - beg;
	str_copy(name, beg, n);
	s = RSTRING_PTR(name);
	for (i = 0; i < n; ++i) {
	    if (s[i] == '-') s[i] = '_';
	}
	do {
	    if (STRNCASECMP(mc->name, s, n) == 0 && !mc->name[n]) {
		n = vend - vbeg;
		if (mc->length) {
		    n = (*mc->length)(p, vbeg, n);
		}
		str_copy(val, vbeg, n);
		(*mc->func)(p, mc->name, RSTRING_PTR(val));
		break;
	    }
	} while (++mc < magic_comments + numberof(magic_comments));
#ifdef RIPPER
	str_copy(val, vbeg, vend - vbeg);
	dispatch2(magic_comment, name, val);
#endif
    }

    return TRUE;
}

static void
set_file_encoding(struct parser_params *p, const char *str, const char *send)
{
    int sep = 0;
    const char *beg = str;
    VALUE s;

    for (;;) {
	if (send - str <= 6) return;
	switch (str[6]) {
	  case 'C': case 'c': str += 6; continue;
	  case 'O': case 'o': str += 5; continue;
	  case 'D': case 'd': str += 4; continue;
	  case 'I': case 'i': str += 3; continue;
	  case 'N': case 'n': str += 2; continue;
	  case 'G': case 'g': str += 1; continue;
	  case '=': case ':':
	    sep = 1;
	    str += 6;
	    break;
	  default:
	    str += 6;
	    if (ISSPACE(*str)) break;
	    continue;
	}
	if (STRNCASECMP(str-6, "coding", 6) == 0) break;
    }
    for (;;) {
	do {
	    if (++str >= send) return;
	} while (ISSPACE(*str));
	if (sep) break;
	if (*str != '=' && *str != ':') return;
	sep = 1;
	str++;
    }
    beg = str;
    while ((*str == '-' || *str == '_' || ISALNUM(*str)) && ++str < send);
    s = rb_str_new(beg, parser_encode_length(p, beg, str - beg));
    parser_set_encode(p, RSTRING_PTR(s));
    rb_str_resize(s, 0);
}

static void
parser_prepare(struct parser_params *p)
{
    int c = nextc(p);
    p->token_info_enabled = !compile_for_eval && RTEST(ruby_verbose);
    switch (c) {
      case '#':
	if (peek(p, '!')) p->has_shebang = 1;
	break;
      case 0xef:		/* UTF-8 BOM marker */
	if (p->lex.pend - p->lex.pcur >= 2 &&
	    (unsigned char)p->lex.pcur[0] == 0xbb &&
	    (unsigned char)p->lex.pcur[1] == 0xbf) {
	    p->enc = rb_utf8_encoding();
	    p->lex.pcur += 2;
	    p->lex.pbeg = p->lex.pcur;
	    return;
	}
	break;
      case EOF:
	return;
    }
    pushback(p, c);
    p->enc = rb_enc_get(p->lex.lastline);
}

#ifndef RIPPER
#define ambiguous_operator(tok, op, syn) ( \
    rb_warning0("`"op"' after local variable or literal is interpreted as binary operator"), \
    rb_warning0("even though it seems like "syn""))
#else
#define ambiguous_operator(tok, op, syn) \
    dispatch2(operator_ambiguous, TOKEN2VAL(tok), rb_str_new_cstr(syn))
#endif
#define warn_balanced(tok, op, syn) ((void) \
    (!IS_lex_state_for(last_state, EXPR_CLASS|EXPR_DOT|EXPR_FNAME|EXPR_ENDFN) && \
     space_seen && !ISSPACE(c) && \
     (ambiguous_operator(tok, op, syn), 0)), \
     (enum yytokentype)(tok))

static VALUE
parse_rational(struct parser_params *p, char *str, int len, int seen_point)
{
    VALUE v;
    char *point = &str[seen_point];
    size_t fraclen = len-seen_point-1;
    memmove(point, point+1, fraclen+1);
    v = rb_cstr_to_inum(str, 10, FALSE);
    return rb_rational_new(v, rb_int_positive_pow(10, fraclen));
}

static enum yytokentype
no_digits(struct parser_params *p)
{
    yyerror0("numeric literal without digits");
    if (peek(p, '_')) nextc(p);
    /* dummy 0, for tUMINUS_NUM at numeric */
    return set_integer_literal(p, INT2FIX(0), 0);
}

static enum yytokentype
parse_numeric(struct parser_params *p, int c)
{
    int is_float, seen_point, seen_e, nondigit;
    int suffix;

    is_float = seen_point = seen_e = nondigit = 0;
    SET_LEX_STATE(EXPR_END);
    newtok(p);
    if (c == '-' || c == '+') {
	tokadd(p, c);
	c = nextc(p);
    }
    if (c == '0') {
	int start = toklen(p);
	c = nextc(p);
	if (c == 'x' || c == 'X') {
	    /* hexadecimal */
	    c = nextc(p);
	    if (c != -1 && ISXDIGIT(c)) {
		do {
		    if (c == '_') {
			if (nondigit) break;
			nondigit = c;
			continue;
		    }
		    if (!ISXDIGIT(c)) break;
		    nondigit = 0;
		    tokadd(p, c);
		} while ((c = nextc(p)) != -1);
	    }
	    pushback(p, c);
	    tokfix(p);
	    if (toklen(p) == start) {
		return no_digits(p);
	    }
	    else if (nondigit) goto trailing_uc;
	    suffix = number_literal_suffix(p, NUM_SUFFIX_ALL);
	    return set_integer_literal(p, rb_cstr_to_inum(tok(p), 16, FALSE), suffix);
	}
	if (c == 'b' || c == 'B') {
	    /* binary */
	    c = nextc(p);
	    if (c == '0' || c == '1') {
		do {
		    if (c == '_') {
			if (nondigit) break;
			nondigit = c;
			continue;
		    }
		    if (c != '0' && c != '1') break;
		    nondigit = 0;
		    tokadd(p, c);
		} while ((c = nextc(p)) != -1);
	    }
	    pushback(p, c);
	    tokfix(p);
	    if (toklen(p) == start) {
		return no_digits(p);
	    }
	    else if (nondigit) goto trailing_uc;
	    suffix = number_literal_suffix(p, NUM_SUFFIX_ALL);
	    return set_integer_literal(p, rb_cstr_to_inum(tok(p), 2, FALSE), suffix);
	}
	if (c == 'd' || c == 'D') {
	    /* decimal */
	    c = nextc(p);
	    if (c != -1 && ISDIGIT(c)) {
		do {
		    if (c == '_') {
			if (nondigit) break;
			nondigit = c;
			continue;
		    }
		    if (!ISDIGIT(c)) break;
		    nondigit = 0;
		    tokadd(p, c);
		} while ((c = nextc(p)) != -1);
	    }
	    pushback(p, c);
	    tokfix(p);
	    if (toklen(p) == start) {
		return no_digits(p);
	    }
	    else if (nondigit) goto trailing_uc;
	    suffix = number_literal_suffix(p, NUM_SUFFIX_ALL);
	    return set_integer_literal(p, rb_cstr_to_inum(tok(p), 10, FALSE), suffix);
	}
	if (c == '_') {
	    /* 0_0 */
	    goto octal_number;
	}
	if (c == 'o' || c == 'O') {
	    /* prefixed octal */
	    c = nextc(p);
	    if (c == -1 || c == '_' || !ISDIGIT(c)) {
		return no_digits(p);
	    }
	}
	if (c >= '0' && c <= '7') {
	    /* octal */
	  octal_number:
	    do {
		if (c == '_') {
		    if (nondigit) break;
		    nondigit = c;
		    continue;
		}
		if (c < '0' || c > '9') break;
		if (c > '7') goto invalid_octal;
		nondigit = 0;
		tokadd(p, c);
	    } while ((c = nextc(p)) != -1);
	    if (toklen(p) > start) {
		pushback(p, c);
		tokfix(p);
		if (nondigit) goto trailing_uc;
		suffix = number_literal_suffix(p, NUM_SUFFIX_ALL);
		return set_integer_literal(p, rb_cstr_to_inum(tok(p), 8, FALSE), suffix);
	    }
	    if (nondigit) {
		pushback(p, c);
		goto trailing_uc;
	    }
	}
	if (c > '7' && c <= '9') {
	  invalid_octal:
	    yyerror0("Invalid octal digit");
	}
	else if (c == '.' || c == 'e' || c == 'E') {
	    tokadd(p, '0');
	}
	else {
	    pushback(p, c);
	    suffix = number_literal_suffix(p, NUM_SUFFIX_ALL);
	    return set_integer_literal(p, INT2FIX(0), suffix);
	}
    }

    for (;;) {
	switch (c) {
	  case '0': case '1': case '2': case '3': case '4':
	  case '5': case '6': case '7': case '8': case '9':
	    nondigit = 0;
	    tokadd(p, c);
	    break;

	  case '.':
	    if (nondigit) goto trailing_uc;
	    if (seen_point || seen_e) {
		goto decode_num;
	    }
	    else {
		int c0 = nextc(p);
		if (c0 == -1 || !ISDIGIT(c0)) {
		    pushback(p, c0);
		    goto decode_num;
		}
		c = c0;
	    }
	    seen_point = toklen(p);
	    tokadd(p, '.');
	    tokadd(p, c);
	    is_float++;
	    nondigit = 0;
	    break;

	  case 'e':
	  case 'E':
	    if (nondigit) {
		pushback(p, c);
		c = nondigit;
		goto decode_num;
	    }
	    if (seen_e) {
		goto decode_num;
	    }
	    nondigit = c;
	    c = nextc(p);
	    if (c != '-' && c != '+' && !ISDIGIT(c)) {
		pushback(p, c);
		nondigit = 0;
		goto decode_num;
	    }
	    tokadd(p, nondigit);
	    seen_e++;
	    is_float++;
	    tokadd(p, c);
	    nondigit = (c == '-' || c == '+') ? c : 0;
	    break;

	  case '_':	/* `_' in number just ignored */
	    if (nondigit) goto decode_num;
	    nondigit = c;
	    break;

	  default:
	    goto decode_num;
	}
	c = nextc(p);
    }

  decode_num:
    pushback(p, c);
    if (nondigit) {
      trailing_uc:
	literal_flush(p, p->lex.pcur - 1);
	YYLTYPE loc = RUBY_INIT_YYLLOC();
	compile_error(p, "trailing `%c' in number", nondigit);
	parser_show_error_line(p, &loc);
    }
    tokfix(p);
    if (is_float) {
	enum yytokentype type = tFLOAT;
	VALUE v;

	suffix = number_literal_suffix(p, seen_e ? NUM_SUFFIX_I : NUM_SUFFIX_ALL);
	if (suffix & NUM_SUFFIX_R) {
	    type = tRATIONAL;
	    v = parse_rational(p, tok(p), toklen(p), seen_point);
	}
	else {
	    double d = strtod(tok(p), 0);
	    if (errno == ERANGE) {
		rb_warning1("Float %s out of range", WARN_S(tok(p)));
		errno = 0;
	    }
	    v = DBL2NUM(d);
	}
	return set_number_literal(p, v, type, suffix);
    }
    suffix = number_literal_suffix(p, NUM_SUFFIX_ALL);
    return set_integer_literal(p, rb_cstr_to_inum(tok(p), 10, FALSE), suffix);
}

static enum yytokentype
parse_qmark(struct parser_params *p, int space_seen)
{
    rb_encoding *enc;
    register int c;
    VALUE lit;

    if (IS_END()) {
	SET_LEX_STATE(EXPR_VALUE);
	return '?';
    }
    c = nextc(p);
    if (c == -1) {
	compile_error(p, "incomplete character syntax");
	return 0;
    }
    if (rb_enc_isspace(c, p->enc)) {
	if (!IS_ARG()) {
	    int c2 = escaped_control_code(c);
	    if (c2) {
		WARN_SPACE_CHAR(c2, "?");
	    }
	}
      ternary:
	pushback(p, c);
	SET_LEX_STATE(EXPR_VALUE);
	return '?';
    }
    newtok(p);
    enc = p->enc;
    if (!parser_isascii(p)) {
	if (tokadd_mbchar(p, c) == -1) return 0;
    }
    else if ((rb_enc_isalnum(c, p->enc) || c == '_') &&
	     p->lex.pcur < p->lex.pend && is_identchar(p->lex.pcur, p->lex.pend, p->enc)) {
	if (space_seen) {
	    const char *start = p->lex.pcur - 1, *ptr = start;
	    do {
		int n = parser_precise_mbclen(p, ptr);
		if (n < 0) return -1;
		ptr += n;
	    } while (ptr < p->lex.pend && is_identchar(ptr, p->lex.pend, p->enc));
	    rb_warn2("`?' just followed by `%.*s' is interpreted as" \
		     " a conditional operator, put a space after `?'",
		     WARN_I((int)(ptr - start)), WARN_S_L(start, (ptr - start)));
	}
	goto ternary;
    }
    else if (c == '\\') {
	if (peek(p, 'u')) {
	    nextc(p);
	    enc = rb_utf8_encoding();
	    tokadd_utf8(p, &enc, -1, 0, 0);
	}
	else if (!lex_eol_p(p) && !(c = *p->lex.pcur, ISASCII(c))) {
	    nextc(p);
	    if (tokadd_mbchar(p, c) == -1) return 0;
	}
	else {
	    c = read_escape(p, 0, &enc);
	    tokadd(p, c);
	}
    }
    else {
	tokadd(p, c);
    }
    tokfix(p);
    lit = STR_NEW3(tok(p), toklen(p), enc, 0);
    set_yylval_str(lit);
    SET_LEX_STATE(EXPR_END);
    return tCHAR;
}

static enum yytokentype
parse_percent(struct parser_params *p, const int space_seen, const enum lex_state_e last_state)
{
    register int c;
    const char *ptok = p->lex.pcur;

    if (IS_BEG()) {
	int term;
	int paren;

	c = nextc(p);
      quotation:
	if (c == -1 || !ISALNUM(c)) {
	    term = c;
	    if (!ISASCII(c)) goto unknown;
	    c = 'Q';
	}
	else {
	    term = nextc(p);
	    if (rb_enc_isalnum(term, p->enc) || !parser_isascii(p)) {
	      unknown:
		pushback(p, term);
		c = parser_precise_mbclen(p, p->lex.pcur);
		if (c < 0) return 0;
		p->lex.pcur += c;
		yyerror0("unknown type of %string");
		return 0;
	    }
	}
	if (term == -1) {
	    compile_error(p, "unterminated quoted string meets end of file");
	    return 0;
	}
	paren = term;
	if (term == '(') term = ')';
	else if (term == '[') term = ']';
	else if (term == '{') term = '}';
	else if (term == '<') term = '>';
	else paren = 0;

	p->lex.ptok = ptok-1;
	switch (c) {
	  case 'Q':
	    p->lex.strterm = NEW_STRTERM(str_dquote, term, paren);
	    return tSTRING_BEG;

	  case 'q':
	    p->lex.strterm = NEW_STRTERM(str_squote, term, paren);
	    return tSTRING_BEG;

	  case 'W':
	    p->lex.strterm = NEW_STRTERM(str_dword, term, paren);
	    return tWORDS_BEG;

	  case 'w':
	    p->lex.strterm = NEW_STRTERM(str_sword, term, paren);
	    return tQWORDS_BEG;

	  case 'I':
	    p->lex.strterm = NEW_STRTERM(str_dword, term, paren);
	    return tSYMBOLS_BEG;

	  case 'i':
	    p->lex.strterm = NEW_STRTERM(str_sword, term, paren);
	    return tQSYMBOLS_BEG;

	  case 'x':
	    p->lex.strterm = NEW_STRTERM(str_xquote, term, paren);
	    return tXSTRING_BEG;

	  case 'r':
	    p->lex.strterm = NEW_STRTERM(str_regexp, term, paren);
	    return tREGEXP_BEG;

	  case 's':
	    p->lex.strterm = NEW_STRTERM(str_ssym, term, paren);
	    SET_LEX_STATE(EXPR_FNAME|EXPR_FITEM);
	    return tSYMBEG;

	  default:
	    yyerror0("unknown type of %string");
	    return 0;
	}
    }
    if ((c = nextc(p)) == '=') {
	set_yylval_id('%');
	SET_LEX_STATE(EXPR_BEG);
	return tOP_ASGN;
    }
    if (IS_SPCARG(c) || (IS_lex_state(EXPR_FITEM) && c == 's')) {
	goto quotation;
    }
    SET_LEX_STATE(IS_AFTER_OPERATOR() ? EXPR_ARG : EXPR_BEG);
    pushback(p, c);
    return warn_balanced('%', "%%", "string literal");
}

static int
tokadd_ident(struct parser_params *p, int c)
{
    do {
	if (tokadd_mbchar(p, c) == -1) return -1;
	c = nextc(p);
    } while (parser_is_identchar(p));
    pushback(p, c);
    return 0;
}

static ID
tokenize_ident(struct parser_params *p, const enum lex_state_e last_state)
{
    ID ident = TOK_INTERN();

    set_yylval_name(ident);

    return ident;
}

static int
parse_numvar(struct parser_params *p)
{
    size_t len;
    int overflow;
    unsigned long n = ruby_scan_digits(tok(p)+1, toklen(p)-1, 10, &len, &overflow);
    const unsigned long nth_ref_max =
	((FIXNUM_MAX < INT_MAX) ? FIXNUM_MAX : INT_MAX) >> 1;
    /* NTH_REF is left-shifted to be ORed with back-ref flag and
     * turned into a Fixnum, in compile.c */

    if (overflow || n > nth_ref_max) {
	/* compile_error()? */
	rb_warn1("`%s' is too big for a number variable, always nil", WARN_S(tok(p)));
	return 0;		/* $0 is $PROGRAM_NAME, not NTH_REF */
    }
    else {
	return (int)n;
    }
}

static enum yytokentype
parse_gvar(struct parser_params *p, const enum lex_state_e last_state)
{
    const char *ptr = p->lex.pcur;
    register int c;

    SET_LEX_STATE(EXPR_END);
    p->lex.ptok = ptr - 1; /* from '$' */
    newtok(p);
    c = nextc(p);
    switch (c) {
      case '_':		/* $_: last read line string */
	c = nextc(p);
	if (parser_is_identchar(p)) {
	    tokadd(p, '$');
	    tokadd(p, '_');
	    break;
	}
	pushback(p, c);
	c = '_';
	/* fall through */
      case '~':		/* $~: match-data */
      case '*':		/* $*: argv */
      case '$':		/* $$: pid */
      case '?':		/* $?: last status */
      case '!':		/* $!: error string */
      case '@':		/* $@: error position */
      case '/':		/* $/: input record separator */
      case '\\':		/* $\: output record separator */
      case ';':		/* $;: field separator */
      case ',':		/* $,: output field separator */
      case '.':		/* $.: last read line number */
      case '=':		/* $=: ignorecase */
      case ':':		/* $:: load path */
      case '<':		/* $<: reading filename */
      case '>':		/* $>: default output handle */
      case '\"':		/* $": already loaded files */
	tokadd(p, '$');
	tokadd(p, c);
	goto gvar;

      case '-':
	tokadd(p, '$');
	tokadd(p, c);
	c = nextc(p);
	if (parser_is_identchar(p)) {
	    if (tokadd_mbchar(p, c) == -1) return 0;
	}
	else {
	    pushback(p, c);
	    pushback(p, '-');
	    return '$';
	}
      gvar:
	set_yylval_name(TOK_INTERN());
	return tGVAR;

      case '&':		/* $&: last match */
      case '`':		/* $`: string before last match */
      case '\'':		/* $': string after last match */
      case '+':		/* $+: string matches last paren. */
	if (IS_lex_state_for(last_state, EXPR_FNAME)) {
	    tokadd(p, '$');
	    tokadd(p, c);
	    goto gvar;
	}
	set_yylval_node(NEW_BACK_REF(c, &_cur_loc));
	return tBACK_REF;

      case '1': case '2': case '3':
      case '4': case '5': case '6':
      case '7': case '8': case '9':
	tokadd(p, '$');
	do {
	    tokadd(p, c);
	    c = nextc(p);
	} while (c != -1 && ISDIGIT(c));
	pushback(p, c);
	if (IS_lex_state_for(last_state, EXPR_FNAME)) goto gvar;
	tokfix(p);
	c = parse_numvar(p);
	set_yylval_node(NEW_NTH_REF(c, &_cur_loc));
	return tNTH_REF;

      default:
	if (!parser_is_identchar(p)) {
	    YYLTYPE loc = RUBY_INIT_YYLLOC();
	    if (c == -1 || ISSPACE(c)) {
		compile_error(p, "`$' without identifiers is not allowed as a global variable name");
	    }
	    else {
		pushback(p, c);
		compile_error(p, "`$%c' is not allowed as a global variable name", c);
	    }
	    parser_show_error_line(p, &loc);
	    set_yylval_noname();
	    return tGVAR;
	}
	/* fall through */
      case '0':
	tokadd(p, '$');
    }

    if (tokadd_ident(p, c)) return 0;
    SET_LEX_STATE(EXPR_END);
    tokenize_ident(p, last_state);
    return tGVAR;
}

#ifndef RIPPER
static bool
parser_numbered_param(struct parser_params *p, int n)
{
    if (n < 0) return false;

    if (DVARS_TERMINAL_P(p->lvtbl->args) || DVARS_TERMINAL_P(p->lvtbl->args->prev)) {
	return false;
    }
    if (p->max_numparam == ORDINAL_PARAM) {
	compile_error(p, "ordinary parameter is defined");
	return false;
    }
    struct vtable *args = p->lvtbl->args;
    if (p->max_numparam < n) {
	p->max_numparam = n;
    }
    while (n > args->pos) {
	vtable_add(args, NUMPARAM_IDX_TO_ID(args->pos+1));
    }
    return true;
}
#endif

static enum yytokentype
parse_atmark(struct parser_params *p, const enum lex_state_e last_state)
{
    const char *ptr = p->lex.pcur;
    enum yytokentype result = tIVAR;
    register int c = nextc(p);
    YYLTYPE loc;

    p->lex.ptok = ptr - 1; /* from '@' */
    newtok(p);
    tokadd(p, '@');
    if (c == '@') {
	result = tCVAR;
	tokadd(p, '@');
	c = nextc(p);
    }
    SET_LEX_STATE(IS_lex_state_for(last_state, EXPR_FNAME) ? EXPR_ENDFN : EXPR_END);
    if (c == -1 || !parser_is_identchar(p)) {
	pushback(p, c);
	RUBY_SET_YYLLOC(loc);
	if (result == tIVAR) {
	    compile_error(p, "`@' without identifiers is not allowed as an instance variable name");
	}
	else {
	    compile_error(p, "`@@' without identifiers is not allowed as a class variable name");
	}
	parser_show_error_line(p, &loc);
	set_yylval_noname();
	SET_LEX_STATE(EXPR_END);
	return result;
    }
    else if (ISDIGIT(c)) {
	pushback(p, c);
	RUBY_SET_YYLLOC(loc);
	if (result == tIVAR) {
	    compile_error(p, "`@%c' is not allowed as an instance variable name", c);
	}
	else {
	    compile_error(p, "`@@%c' is not allowed as a class variable name", c);
	}
	parser_show_error_line(p, &loc);
	set_yylval_noname();
	SET_LEX_STATE(EXPR_END);
	return result;
    }

    if (tokadd_ident(p, c)) return 0;
    tokenize_ident(p, last_state);
    return result;
}

static enum yytokentype
parse_ident(struct parser_params *p, int c, int cmd_state)
{
    enum yytokentype result;
    int mb = ENC_CODERANGE_7BIT;
    const enum lex_state_e last_state = p->lex.state;
    ID ident;

    do {
	if (!ISASCII(c)) mb = ENC_CODERANGE_UNKNOWN;
	if (tokadd_mbchar(p, c) == -1) return 0;
	c = nextc(p);
    } while (parser_is_identchar(p));
    if ((c == '!' || c == '?') && !peek(p, '=')) {
	result = tFID;
	tokadd(p, c);
    }
    else if (c == '=' && IS_lex_state(EXPR_FNAME) &&
	     (!peek(p, '~') && !peek(p, '>') && (!peek(p, '=') || (peek_n(p, '>', 1))))) {
	result = tIDENTIFIER;
	tokadd(p, c);
    }
    else {
	result = tCONSTANT;	/* assume provisionally */
	pushback(p, c);
    }
    tokfix(p);

    if (IS_LABEL_POSSIBLE()) {
	if (IS_LABEL_SUFFIX(0)) {
	    SET_LEX_STATE(EXPR_ARG|EXPR_LABELED);
	    nextc(p);
	    set_yylval_name(TOK_INTERN());
	    return tLABEL;
	}
    }
    if (mb == ENC_CODERANGE_7BIT && !IS_lex_state(EXPR_DOT)) {
	const struct kwtable *kw;

	/* See if it is a reserved word.  */
	kw = rb_reserved_word(tok(p), toklen(p));
	if (kw) {
	    enum lex_state_e state = p->lex.state;
	    if (IS_lex_state_for(state, EXPR_FNAME)) {
		SET_LEX_STATE(EXPR_ENDFN);
		set_yylval_name(rb_intern2(tok(p), toklen(p)));
		return kw->id[0];
	    }
	    SET_LEX_STATE(kw->state);
	    if (IS_lex_state(EXPR_BEG)) {
		p->command_start = TRUE;
	    }
	    if (kw->id[0] == keyword_do) {
		if (lambda_beginning_p()) {
		    p->lex.lpar_beg = -1; /* make lambda_beginning_p() == FALSE in the body of "-> do ... end" */
		    return keyword_do_LAMBDA;
		}
		if (COND_P()) return keyword_do_cond;
		if (CMDARG_P() && !IS_lex_state_for(state, EXPR_CMDARG))
		    return keyword_do_block;
		return keyword_do;
	    }
	    if (IS_lex_state_for(state, (EXPR_BEG | EXPR_LABELED)))
		return kw->id[0];
	    else {
		if (kw->id[0] != kw->id[1])
		    SET_LEX_STATE(EXPR_BEG | EXPR_LABEL);
		return kw->id[1];
	    }
	}
    }

    if (IS_lex_state(EXPR_BEG_ANY | EXPR_ARG_ANY | EXPR_DOT)) {
	if (cmd_state) {
	    SET_LEX_STATE(EXPR_CMDARG);
	}
	else {
	    SET_LEX_STATE(EXPR_ARG);
	}
    }
    else if (p->lex.state == EXPR_FNAME) {
	SET_LEX_STATE(EXPR_ENDFN);
    }
    else {
	SET_LEX_STATE(EXPR_END);
    }

    ident = tokenize_ident(p, last_state);
    if (result == tCONSTANT && is_local_id(ident)) result = tIDENTIFIER;
    if (!IS_lex_state_for(last_state, EXPR_DOT|EXPR_FNAME) &&
	(result == tIDENTIFIER) && /* not EXPR_FNAME, not attrasgn */
	lvar_defined(p, ident)) {
	SET_LEX_STATE(EXPR_END|EXPR_LABEL);
    }
    return result;
}

static enum yytokentype
parser_yylex(struct parser_params *p)
{
    register int c;
    int space_seen = 0;
    int cmd_state;
    int label;
    enum lex_state_e last_state;
    int fallthru = FALSE;
    int token_seen = p->token_seen;

    if (p->lex.strterm) {
	if (p->lex.strterm->flags & STRTERM_HEREDOC) {
	    return here_document(p, &p->lex.strterm->u.heredoc);
	}
	else {
	    token_flush(p);
	    return parse_string(p, &p->lex.strterm->u.literal);
	}
    }
    cmd_state = p->command_start;
    p->command_start = FALSE;
    p->token_seen = TRUE;
  retry:
    last_state = p->lex.state;
#ifndef RIPPER
    token_flush(p);
#endif
    switch (c = nextc(p)) {
      case '\0':		/* NUL */
      case '\004':		/* ^D */
      case '\032':		/* ^Z */
      case -1:			/* end of script. */
	return 0;

	/* white spaces */
      case '\r':
	if (!p->cr_seen) {
	    p->cr_seen = TRUE;
	    /* carried over with p->lex.nextline for nextc() */
	    rb_warn0("encountered \\r in middle of line, treated as a mere space");
	}
	/* fall through */
      case ' ': case '\t': case '\f':
      case '\13': /* '\v' */
	space_seen = 1;
#ifdef RIPPER
	while ((c = nextc(p))) {
	    switch (c) {
	      case ' ': case '\t': case '\f': case '\r':
	      case '\13': /* '\v' */
		break;
	      default:
		goto outofloop;
	    }
	}
      outofloop:
	pushback(p, c);
	dispatch_scan_event(p, tSP);
#endif
	goto retry;

      case '#':		/* it's a comment */
	p->token_seen = token_seen;
	/* no magic_comment in shebang line */
	if (!parser_magic_comment(p, p->lex.pcur, p->lex.pend - p->lex.pcur)) {
	    if (comment_at_top(p)) {
		set_file_encoding(p, p->lex.pcur, p->lex.pend);
	    }
	}
	lex_goto_eol(p);
        dispatch_scan_event(p, tCOMMENT);
        fallthru = TRUE;
	/* fall through */
      case '\n':
	p->token_seen = token_seen;
	c = (IS_lex_state(EXPR_BEG|EXPR_CLASS|EXPR_FNAME|EXPR_DOT) &&
	     !IS_lex_state(EXPR_LABELED));
	if (c || IS_lex_state_all(EXPR_ARG|EXPR_LABELED)) {
            if (!fallthru) {
                dispatch_scan_event(p, tIGNORED_NL);
            }
            fallthru = FALSE;
	    if (!c && p->ctxt.in_kwarg) {
		goto normal_newline;
	    }
	    goto retry;
	}
	while (1) {
	    switch (c = nextc(p)) {
	      case ' ': case '\t': case '\f': case '\r':
	      case '\13': /* '\v' */
		space_seen = 1;
		break;
	      case '#':
		pushback(p, c);
		if (space_seen) dispatch_scan_event(p, tSP);
		goto retry;
	      case '&':
	      case '.': {
		dispatch_delayed_token(p, tIGNORED_NL);
		if (peek(p, '.') == (c == '&')) {
		    pushback(p, c);
		    dispatch_scan_event(p, tSP);
		    goto retry;
		}
	      }
	      default:
		p->ruby_sourceline--;
		p->lex.nextline = p->lex.lastline;
	      case -1:		/* EOF no decrement*/
#ifndef RIPPER
		if (p->lex.prevline && !p->eofp) p->lex.lastline = p->lex.prevline;
		p->lex.pbeg = RSTRING_PTR(p->lex.lastline);
		p->lex.pend = p->lex.pcur = p->lex.pbeg + RSTRING_LEN(p->lex.lastline);
		pushback(p, 1); /* always pushback */
		p->lex.ptok = p->lex.pcur;
#else
		lex_goto_eol(p);
		if (c != -1) {
		    p->lex.ptok = p->lex.pcur;
		}
#endif
		goto normal_newline;
	    }
	}
      normal_newline:
	p->command_start = TRUE;
	SET_LEX_STATE(EXPR_BEG);
	return '\n';

      case '*':
	if ((c = nextc(p)) == '*') {
	    if ((c = nextc(p)) == '=') {
		set_yylval_id(idPow);
		SET_LEX_STATE(EXPR_BEG);
		return tOP_ASGN;
	    }
	    pushback(p, c);
	    if (IS_SPCARG(c)) {
		rb_warning0("`**' interpreted as argument prefix");
		c = tDSTAR;
	    }
	    else if (IS_BEG()) {
		c = tDSTAR;
	    }
	    else {
		c = warn_balanced((enum ruby_method_ids)tPOW, "**", "argument prefix");
	    }
	}
	else {
	    if (c == '=') {
                set_yylval_id('*');
		SET_LEX_STATE(EXPR_BEG);
		return tOP_ASGN;
	    }
	    pushback(p, c);
	    if (IS_SPCARG(c)) {
		rb_warning0("`*' interpreted as argument prefix");
		c = tSTAR;
	    }
	    else if (IS_BEG()) {
		c = tSTAR;
	    }
	    else {
		c = warn_balanced('*', "*", "argument prefix");
	    }
	}
	SET_LEX_STATE(IS_AFTER_OPERATOR() ? EXPR_ARG : EXPR_BEG);
	return c;

      case '!':
	c = nextc(p);
	if (IS_AFTER_OPERATOR()) {
	    SET_LEX_STATE(EXPR_ARG);
	    if (c == '@') {
		return '!';
	    }
	}
	else {
	    SET_LEX_STATE(EXPR_BEG);
	}
	if (c == '=') {
	    return tNEQ;
	}
	if (c == '~') {
	    return tNMATCH;
	}
	pushback(p, c);
	return '!';

      case '=':
	if (was_bol(p)) {
	    /* skip embedded rd document */
	    if (word_match_p(p, "begin", 5)) {
		int first_p = TRUE;

		lex_goto_eol(p);
		dispatch_scan_event(p, tEMBDOC_BEG);
		for (;;) {
		    lex_goto_eol(p);
		    if (!first_p) {
			dispatch_scan_event(p, tEMBDOC);
		    }
		    first_p = FALSE;
		    c = nextc(p);
		    if (c == -1) {
			compile_error(p, "embedded document meets end of file");
			return 0;
		    }
		    if (c == '=' && word_match_p(p, "end", 3)) {
			break;
		    }
		    pushback(p, c);
		}
		lex_goto_eol(p);
		dispatch_scan_event(p, tEMBDOC_END);
		goto retry;
	    }
	}

	SET_LEX_STATE(IS_AFTER_OPERATOR() ? EXPR_ARG : EXPR_BEG);
	if ((c = nextc(p)) == '=') {
	    if ((c = nextc(p)) == '=') {
		return tEQQ;
	    }
	    pushback(p, c);
	    return tEQ;
	}
	if (c == '~') {
	    return tMATCH;
	}
	else if (c == '>') {
	    return tASSOC;
	}
	pushback(p, c);
	return '=';

      case '<':
	c = nextc(p);
	if (c == '<' &&
	    !IS_lex_state(EXPR_DOT | EXPR_CLASS) &&
	    !IS_END() &&
	    (!IS_ARG() || IS_lex_state(EXPR_LABELED) || space_seen)) {
	    int token = heredoc_identifier(p);
	    if (token) return token < 0 ? 0 : token;
	}
	if (IS_AFTER_OPERATOR()) {
	    SET_LEX_STATE(EXPR_ARG);
	}
	else {
	    if (IS_lex_state(EXPR_CLASS))
		p->command_start = TRUE;
	    SET_LEX_STATE(EXPR_BEG);
	}
	if (c == '=') {
	    if ((c = nextc(p)) == '>') {
		return tCMP;
	    }
	    pushback(p, c);
	    return tLEQ;
	}
	if (c == '<') {
	    if ((c = nextc(p)) == '=') {
		set_yylval_id(idLTLT);
		SET_LEX_STATE(EXPR_BEG);
		return tOP_ASGN;
	    }
	    pushback(p, c);
	    return warn_balanced((enum ruby_method_ids)tLSHFT, "<<", "here document");
	}
	pushback(p, c);
	return '<';

      case '>':
	SET_LEX_STATE(IS_AFTER_OPERATOR() ? EXPR_ARG : EXPR_BEG);
	if ((c = nextc(p)) == '=') {
	    return tGEQ;
	}
	if (c == '>') {
	    if ((c = nextc(p)) == '=') {
		set_yylval_id(idGTGT);
		SET_LEX_STATE(EXPR_BEG);
		return tOP_ASGN;
	    }
	    pushback(p, c);
	    return tRSHFT;
	}
	pushback(p, c);
	return '>';

      case '"':
	label = (IS_LABEL_POSSIBLE() ? str_label : 0);
	p->lex.strterm = NEW_STRTERM(str_dquote | label, '"', 0);
	p->lex.ptok = p->lex.pcur-1;
	return tSTRING_BEG;

      case '`':
	if (IS_lex_state(EXPR_FNAME)) {
	    SET_LEX_STATE(EXPR_ENDFN);
	    return c;
	}
	if (IS_lex_state(EXPR_DOT)) {
	    if (cmd_state)
		SET_LEX_STATE(EXPR_CMDARG);
	    else
		SET_LEX_STATE(EXPR_ARG);
	    return c;
	}
	p->lex.strterm = NEW_STRTERM(str_xquote, '`', 0);
	return tXSTRING_BEG;

      case '\'':
	label = (IS_LABEL_POSSIBLE() ? str_label : 0);
	p->lex.strterm = NEW_STRTERM(str_squote | label, '\'', 0);
	p->lex.ptok = p->lex.pcur-1;
	return tSTRING_BEG;

      case '?':
	return parse_qmark(p, space_seen);

      case '&':
	if ((c = nextc(p)) == '&') {
	    SET_LEX_STATE(EXPR_BEG);
	    if ((c = nextc(p)) == '=') {
                set_yylval_id(idANDOP);
		SET_LEX_STATE(EXPR_BEG);
		return tOP_ASGN;
	    }
	    pushback(p, c);
	    return tANDOP;
	}
	else if (c == '=') {
            set_yylval_id('&');
	    SET_LEX_STATE(EXPR_BEG);
	    return tOP_ASGN;
	}
	else if (c == '.') {
	    set_yylval_id(idANDDOT);
	    SET_LEX_STATE(EXPR_DOT);
	    return tANDDOT;
	}
	pushback(p, c);
	if (IS_SPCARG(c)) {
	    if ((c != ':') ||
		(c = peekc_n(p, 1)) == -1 ||
		!(c == '\'' || c == '"' ||
		  is_identchar((p->lex.pcur+1), p->lex.pend, p->enc))) {
		rb_warning0("`&' interpreted as argument prefix");
	    }
	    c = tAMPER;
	}
	else if (IS_BEG()) {
	    c = tAMPER;
	}
	else {
	    c = warn_balanced('&', "&", "argument prefix");
	}
	SET_LEX_STATE(IS_AFTER_OPERATOR() ? EXPR_ARG : EXPR_BEG);
	return c;

      case '|':
	if ((c = nextc(p)) == '|') {
	    SET_LEX_STATE(EXPR_BEG);
	    if ((c = nextc(p)) == '=') {
                set_yylval_id(idOROP);
		SET_LEX_STATE(EXPR_BEG);
		return tOP_ASGN;
	    }
	    pushback(p, c);
	    if (IS_lex_state_for(last_state, EXPR_BEG)) {
		c = '|';
		pushback(p, '|');
		return c;
	    }
	    return tOROP;
	}
	if (c == '=') {
            set_yylval_id('|');
	    SET_LEX_STATE(EXPR_BEG);
	    return tOP_ASGN;
	}
	SET_LEX_STATE(IS_AFTER_OPERATOR() ? EXPR_ARG : EXPR_BEG|EXPR_LABEL);
	pushback(p, c);
	return '|';

      case '+':
	c = nextc(p);
	if (IS_AFTER_OPERATOR()) {
	    SET_LEX_STATE(EXPR_ARG);
	    if (c == '@') {
		return tUPLUS;
	    }
	    pushback(p, c);
	    return '+';
	}
	if (c == '=') {
            set_yylval_id('+');
	    SET_LEX_STATE(EXPR_BEG);
	    return tOP_ASGN;
	}
	if (IS_BEG() || (IS_SPCARG(c) && arg_ambiguous(p, '+'))) {
	    SET_LEX_STATE(EXPR_BEG);
	    pushback(p, c);
	    if (c != -1 && ISDIGIT(c)) {
		return parse_numeric(p, '+');
	    }
	    return tUPLUS;
	}
	SET_LEX_STATE(EXPR_BEG);
	pushback(p, c);
	return warn_balanced('+', "+", "unary operator");

      case '-':
	c = nextc(p);
	if (IS_AFTER_OPERATOR()) {
	    SET_LEX_STATE(EXPR_ARG);
	    if (c == '@') {
		return tUMINUS;
	    }
	    pushback(p, c);
	    return '-';
	}
	if (c == '=') {
            set_yylval_id('-');
	    SET_LEX_STATE(EXPR_BEG);
	    return tOP_ASGN;
	}
	if (c == '>') {
	    SET_LEX_STATE(EXPR_ENDFN);
	    return tLAMBDA;
	}
	if (IS_BEG() || (IS_SPCARG(c) && arg_ambiguous(p, '-'))) {
	    SET_LEX_STATE(EXPR_BEG);
	    pushback(p, c);
	    if (c != -1 && ISDIGIT(c)) {
		return tUMINUS_NUM;
	    }
	    return tUMINUS;
	}
	SET_LEX_STATE(EXPR_BEG);
	pushback(p, c);
	return warn_balanced('-', "-", "unary operator");

      case '.': {
        int is_beg = IS_BEG();
	SET_LEX_STATE(EXPR_BEG);
	if ((c = nextc(p)) == '.') {
	    if ((c = nextc(p)) == '.') {
		if (p->lex.paren_nest == 0 && looking_at_eol_p(p)) {
		    rb_warn0("... at EOL, should be parenthesized?");
		}
		else if (p->lex.lpar_beg >= 0 && p->lex.lpar_beg+1 == p->lex.paren_nest) {
		    if (IS_lex_state_for(last_state, EXPR_LABEL))
			return tDOT3;
		}
		return is_beg ? tBDOT3 : tDOT3;
	    }
	    pushback(p, c);
	    return is_beg ? tBDOT2 : tDOT2;
	}
	pushback(p, c);
	if (c != -1 && ISDIGIT(c)) {
	    char prev = p->lex.pcur-1 > p->lex.pbeg ? *(p->lex.pcur-2) : 0;
	    parse_numeric(p, '.');
	    if (ISDIGIT(prev)) {
		yyerror0("unexpected fraction part after numeric literal");
	    }
	    else {
		yyerror0("no .<digit> floating literal anymore; put 0 before dot");
	    }
	    SET_LEX_STATE(EXPR_END);
	    p->lex.ptok = p->lex.pcur;
	    goto retry;
	}
	set_yylval_id('.');
	SET_LEX_STATE(EXPR_DOT);
	return '.';
      }

      case '0': case '1': case '2': case '3': case '4':
      case '5': case '6': case '7': case '8': case '9':
	return parse_numeric(p, c);

      case ')':
	COND_POP();
	CMDARG_POP();
	SET_LEX_STATE(EXPR_ENDFN);
	p->lex.paren_nest--;
	return c;

      case ']':
	COND_POP();
	CMDARG_POP();
	SET_LEX_STATE(EXPR_END);
	p->lex.paren_nest--;
	return c;

      case '}':
	/* tSTRING_DEND does COND_POP and CMDARG_POP in the yacc's rule */
	if (!p->lex.brace_nest--) return tSTRING_DEND;
	COND_POP();
	CMDARG_POP();
	SET_LEX_STATE(EXPR_END);
	p->lex.paren_nest--;
	return c;

      case ':':
	c = nextc(p);
	if (c == ':') {
	    if (IS_BEG() || IS_lex_state(EXPR_CLASS) || IS_SPCARG(-1)) {
		SET_LEX_STATE(EXPR_BEG);
		return tCOLON3;
	    }
	    set_yylval_id(idCOLON2);
	    SET_LEX_STATE(EXPR_DOT);
	    return tCOLON2;
	}
	if (IS_END() || ISSPACE(c) || c == '#') {
	    pushback(p, c);
	    c = warn_balanced(':', ":", "symbol literal");
	    SET_LEX_STATE(EXPR_BEG);
	    return c;
	}
	switch (c) {
	  case '\'':
	    p->lex.strterm = NEW_STRTERM(str_ssym, c, 0);
	    break;
	  case '"':
	    p->lex.strterm = NEW_STRTERM(str_dsym, c, 0);
	    break;
	  default:
	    pushback(p, c);
	    break;
	}
	SET_LEX_STATE(EXPR_FNAME);
	return tSYMBEG;

      case '/':
	if (IS_BEG()) {
	    p->lex.strterm = NEW_STRTERM(str_regexp, '/', 0);
	    return tREGEXP_BEG;
	}
	if ((c = nextc(p)) == '=') {
            set_yylval_id('/');
	    SET_LEX_STATE(EXPR_BEG);
	    return tOP_ASGN;
	}
	pushback(p, c);
	if (IS_SPCARG(c)) {
	    arg_ambiguous(p, '/');
	    p->lex.strterm = NEW_STRTERM(str_regexp, '/', 0);
	    return tREGEXP_BEG;
	}
	SET_LEX_STATE(IS_AFTER_OPERATOR() ? EXPR_ARG : EXPR_BEG);
	return warn_balanced('/', "/", "regexp literal");

      case '^':
	if ((c = nextc(p)) == '=') {
            set_yylval_id('^');
	    SET_LEX_STATE(EXPR_BEG);
	    return tOP_ASGN;
	}
	SET_LEX_STATE(IS_AFTER_OPERATOR() ? EXPR_ARG : EXPR_BEG);
	pushback(p, c);
	return '^';

      case ';':
	SET_LEX_STATE(EXPR_BEG);
	p->command_start = TRUE;
	return ';';

      case ',':
	SET_LEX_STATE(EXPR_BEG|EXPR_LABEL);
	return ',';

      case '~':
	if (IS_AFTER_OPERATOR()) {
	    if ((c = nextc(p)) != '@') {
		pushback(p, c);
	    }
	    SET_LEX_STATE(EXPR_ARG);
	}
	else {
	    SET_LEX_STATE(EXPR_BEG);
	}
	return '~';

      case '(':
	if (IS_BEG()) {
	    c = tLPAREN;
	}
	else if (!space_seen) {
	    /* foo( ... ) => method call, no ambiguity */
	}
	else if (IS_ARG() || IS_lex_state_all(EXPR_END|EXPR_LABEL)) {
	    c = tLPAREN_ARG;
	}
	else if (IS_lex_state(EXPR_ENDFN) && !lambda_beginning_p()) {
	    rb_warning0("parentheses after method name is interpreted as "
			"an argument list, not a decomposed argument");
	}
	p->lex.paren_nest++;
	COND_PUSH(0);
	CMDARG_PUSH(0);
	SET_LEX_STATE(EXPR_BEG|EXPR_LABEL);
	return c;

      case '[':
	p->lex.paren_nest++;
	if (IS_AFTER_OPERATOR()) {
	    if ((c = nextc(p)) == ']') {
		SET_LEX_STATE(EXPR_ARG);
		if ((c = nextc(p)) == '=') {
		    return tASET;
		}
		pushback(p, c);
		return tAREF;
	    }
	    pushback(p, c);
	    SET_LEX_STATE(EXPR_ARG|EXPR_LABEL);
	    return '[';
	}
	else if (IS_BEG()) {
	    c = tLBRACK;
	}
	else if (IS_ARG() && (space_seen || IS_lex_state(EXPR_LABELED))) {
	    c = tLBRACK;
	}
	SET_LEX_STATE(EXPR_BEG|EXPR_LABEL);
	COND_PUSH(0);
	CMDARG_PUSH(0);
	return c;

      case '{':
	++p->lex.brace_nest;
	if (lambda_beginning_p())
	    c = tLAMBEG;
	else if (IS_lex_state(EXPR_LABELED))
	    c = tLBRACE;      /* hash */
	else if (IS_lex_state(EXPR_ARG_ANY | EXPR_END | EXPR_ENDFN))
	    c = '{';          /* block (primary) */
	else if (IS_lex_state(EXPR_ENDARG))
	    c = tLBRACE_ARG;  /* block (expr) */
	else
	    c = tLBRACE;      /* hash */
	if (c != tLBRACE) {
	    p->command_start = TRUE;
	    SET_LEX_STATE(EXPR_BEG);
	}
	else {
	    SET_LEX_STATE(EXPR_BEG|EXPR_LABEL);
	}
	++p->lex.paren_nest;  /* after lambda_beginning_p() */
	COND_PUSH(0);
	CMDARG_PUSH(0);
	return c;

      case '\\':
	c = nextc(p);
	if (c == '\n') {
	    space_seen = 1;
	    dispatch_scan_event(p, tSP);
	    goto retry; /* skip \\n */
	}
	if (c == ' ') return tSP;
	if (ISSPACE(c)) return c;
	pushback(p, c);
	return '\\';

      case '%':
	return parse_percent(p, space_seen, last_state);

      case '$':
	return parse_gvar(p, last_state);

      case '@':
	return parse_atmark(p, last_state);

      case '_':
	if (was_bol(p) && whole_match_p(p, "__END__", 7, 0)) {
	    p->ruby__end__seen = 1;
	    p->eofp = 1;
#ifndef RIPPER
	    return -1;
#else
            lex_goto_eol(p);
            dispatch_scan_event(p, k__END__);
            return 0;
#endif
	}
	newtok(p);
	break;

      default:
	if (!parser_is_identchar(p)) {
	    compile_error(p, "Invalid char `\\x%02X' in expression", c);
            token_flush(p);
	    goto retry;
	}

	newtok(p);
	break;
    }

    return parse_ident(p, c, cmd_state);
}

static enum yytokentype
yylex(YYSTYPE *lval, YYLTYPE *yylloc, struct parser_params *p)
{
    enum yytokentype t;

    p->lval = lval;
    lval->val = Qundef;
    t = parser_yylex(p);

    if (p->lex.strterm && (p->lex.strterm->flags & STRTERM_HEREDOC))
	RUBY_SET_YYLLOC_FROM_STRTERM_HEREDOC(*yylloc);
    else
	RUBY_SET_YYLLOC(*yylloc);

    if (has_delayed_token(p))
	dispatch_delayed_token(p, t);
    else if (t != 0)
	dispatch_scan_event(p, t);

    return t;
}

#define LVAR_USED ((ID)1 << (sizeof(ID) * CHAR_BIT - 1))

static NODE*
node_newnode(struct parser_params *p, enum node_type type, VALUE a0, VALUE a1, VALUE a2, const rb_code_location_t *loc)
{
    NODE *n = rb_ast_newnode(p->ast, type);

    rb_node_init(n, type, a0, a1, a2);

    nd_set_loc(n, loc);
    nd_set_node_id(n, parser_get_node_id(p));
    return n;
}

static NODE *
nd_set_loc(NODE *nd, const YYLTYPE *loc)
{
    nd->nd_loc = *loc;
    nd_set_line(nd, loc->beg_pos.lineno);
    return nd;
}

#ifndef RIPPER
static enum node_type
nodetype(NODE *node)			/* for debug */
{
    return (enum node_type)nd_type(node);
}

static int
nodeline(NODE *node)
{
    return nd_line(node);
}

static NODE*
newline_node(NODE *node)
{
    if (node) {
	node = remove_begin(node);
	node->flags |= NODE_FL_NEWLINE;
    }
    return node;
}

static void
fixpos(NODE *node, NODE *orig)
{
    if (!node) return;
    if (!orig) return;
    nd_set_line(node, nd_line(orig));
}

static void
parser_warning(struct parser_params *p, NODE *node, const char *mesg)
{
    rb_compile_warning(p->ruby_sourcefile, nd_line(node), "%s", mesg);
}

static void
parser_warn(struct parser_params *p, NODE *node, const char *mesg)
{
    rb_compile_warn(p->ruby_sourcefile, nd_line(node), "%s", mesg);
}

static NODE*
block_append(struct parser_params *p, NODE *head, NODE *tail)
{
    NODE *end, *h = head, *nd;

    if (tail == 0) return head;

    if (h == 0) return tail;
    switch (nd_type(h)) {
      case NODE_LIT:
      case NODE_STR:
      case NODE_SELF:
      case NODE_TRUE:
      case NODE_FALSE:
      case NODE_NIL:
	parser_warning(p, h, "unused literal ignored");
	return tail;
      default:
	h = end = NEW_BLOCK(head, &head->nd_loc);
	end->nd_end = end;
	head = end;
	break;
      case NODE_BLOCK:
	end = h->nd_end;
	break;
    }

    nd = end->nd_head;
    switch (nd_type(nd)) {
      case NODE_RETURN:
      case NODE_BREAK:
      case NODE_NEXT:
      case NODE_REDO:
      case NODE_RETRY:
	if (RTEST(ruby_verbose)) {
	    parser_warning(p, tail, "statement not reached");
	}
	break;

      default:
	break;
    }

    if (nd_type(tail) != NODE_BLOCK) {
	tail = NEW_BLOCK(tail, &tail->nd_loc);
	tail->nd_end = tail;
    }
    end->nd_next = tail;
    h->nd_end = tail->nd_end;
    nd_set_last_loc(head, nd_last_loc(tail));
    return head;
}

/* append item to the list */
static NODE*
list_append(struct parser_params *p, NODE *list, NODE *item)
{
    NODE *last;

    if (list == 0) return NEW_LIST(item, &item->nd_loc);
    if (list->nd_next) {
	last = list->nd_next->nd_end;
    }
    else {
	last = list;
    }

    list->nd_alen += 1;
    last->nd_next = NEW_LIST(item, &item->nd_loc);
    list->nd_next->nd_end = last->nd_next;

    nd_set_last_loc(list, nd_last_loc(item));

    return list;
}

/* concat two lists */
static NODE*
list_concat(NODE *head, NODE *tail)
{
    NODE *last;

    if (head->nd_next) {
	last = head->nd_next->nd_end;
    }
    else {
	last = head;
    }

    head->nd_alen += tail->nd_alen;
    last->nd_next = tail;
    if (tail->nd_next) {
	head->nd_next->nd_end = tail->nd_next->nd_end;
    }
    else {
	head->nd_next->nd_end = tail;
    }

    nd_set_last_loc(head, nd_last_loc(tail));

    return head;
}

static int
literal_concat0(struct parser_params *p, VALUE head, VALUE tail)
{
    if (NIL_P(tail)) return 1;
    if (!rb_enc_compatible(head, tail)) {
	compile_error(p, "string literal encodings differ (%s / %s)",
		      rb_enc_name(rb_enc_get(head)),
		      rb_enc_name(rb_enc_get(tail)));
	rb_str_resize(head, 0);
	rb_str_resize(tail, 0);
	return 0;
    }
    rb_str_buf_append(head, tail);
    return 1;
}

static VALUE
string_literal_head(enum node_type htype, NODE *head)
{
    if (htype != NODE_DSTR) return Qfalse;
    if (head->nd_next) {
	head = head->nd_next->nd_end->nd_head;
	if (!head || nd_type(head) != NODE_STR) return Qfalse;
    }
    const VALUE lit = head->nd_lit;
    ASSUME(lit != Qfalse);
    return lit;
}

/* concat two string literals */
static NODE *
literal_concat(struct parser_params *p, NODE *head, NODE *tail, const YYLTYPE *loc)
{
    enum node_type htype;
    VALUE lit;

    if (!head) return tail;
    if (!tail) return head;

    htype = nd_type(head);
    if (htype == NODE_EVSTR) {
	head = new_dstr(p, head, loc);
	htype = NODE_DSTR;
    }
    if (p->heredoc_indent > 0) {
	switch (htype) {
	  case NODE_STR:
	    nd_set_type(head, NODE_DSTR);
	  case NODE_DSTR:
	    return list_append(p, head, tail);
	  default:
	    break;
	}
    }
    switch (nd_type(tail)) {
      case NODE_STR:
	if ((lit = string_literal_head(htype, head)) != Qfalse) {
	    htype = NODE_STR;
	}
	else {
	    lit = head->nd_lit;
	}
	if (htype == NODE_STR) {
	    if (!literal_concat0(p, lit, tail->nd_lit)) {
	      error:
		rb_discard_node(p, head);
		rb_discard_node(p, tail);
		return 0;
	    }
	    rb_discard_node(p, tail);
	}
	else {
	    list_append(p, head, tail);
	}
	break;

      case NODE_DSTR:
	if (htype == NODE_STR) {
	    if (!literal_concat0(p, head->nd_lit, tail->nd_lit))
		goto error;
	    tail->nd_lit = head->nd_lit;
	    rb_discard_node(p, head);
	    head = tail;
	}
	else if (NIL_P(tail->nd_lit)) {
	  append:
	    head->nd_alen += tail->nd_alen - 1;
	    if (!head->nd_next) {
		head->nd_next = tail->nd_next;
	    }
	    else if (tail->nd_next) {
		head->nd_next->nd_end->nd_next = tail->nd_next;
		head->nd_next->nd_end = tail->nd_next->nd_end;
	    }
	    rb_discard_node(p, tail);
	}
	else if ((lit = string_literal_head(htype, head)) != Qfalse) {
	    if (!literal_concat0(p, lit, tail->nd_lit))
		goto error;
	    tail->nd_lit = Qnil;
	    goto append;
	}
	else {
	    list_concat(head, NEW_NODE(NODE_LIST, NEW_STR(tail->nd_lit, loc), tail->nd_alen, tail->nd_next, loc));
	}
	break;

      case NODE_EVSTR:
	if (htype == NODE_STR) {
	    nd_set_type(head, NODE_DSTR);
	    head->nd_alen = 1;
	}
	list_append(p, head, tail);
	break;
    }
    return head;
}

static NODE *
evstr2dstr(struct parser_params *p, NODE *node)
{
    if (nd_type(node) == NODE_EVSTR) {
	node = new_dstr(p, node, &node->nd_loc);
    }
    return node;
}

static NODE *
new_evstr(struct parser_params *p, NODE *node, const YYLTYPE *loc)
{
    NODE *head = node;

    if (node) {
	switch (nd_type(node)) {
	  case NODE_STR:
	    nd_set_type(node, NODE_DSTR);
	  case NODE_DSTR: case NODE_EVSTR:
	    return node;
	}
    }
    return NEW_EVSTR(head, loc);
}

static NODE *
new_dstr(struct parser_params *p, NODE *node, const YYLTYPE *loc)
{
    VALUE lit = STR_NEW0();
    NODE *dstr = NEW_DSTR(lit, loc);
    RB_OBJ_WRITTEN(p->ast, Qnil, lit);
    return list_append(p, dstr, node);
}

static NODE *
call_bin_op(struct parser_params *p, NODE *recv, ID id, NODE *arg1,
		const YYLTYPE *op_loc, const YYLTYPE *loc)
{
    NODE *expr;
    value_expr(recv);
    value_expr(arg1);
    expr = NEW_OPCALL(recv, id, NEW_LIST(arg1, &arg1->nd_loc), loc);
    nd_set_line(expr, op_loc->beg_pos.lineno);
    return expr;
}

static NODE *
call_uni_op(struct parser_params *p, NODE *recv, ID id, const YYLTYPE *op_loc, const YYLTYPE *loc)
{
    NODE *opcall;
    value_expr(recv);
    opcall = NEW_OPCALL(recv, id, 0, loc);
    nd_set_line(opcall, op_loc->beg_pos.lineno);
    return opcall;
}

static NODE *
new_qcall(struct parser_params* p, ID atype, NODE *recv, ID mid, NODE *args, const YYLTYPE *op_loc, const YYLTYPE *loc)
{
    NODE *qcall = NEW_QCALL(atype, recv, mid, args, loc);
    nd_set_line(qcall, op_loc->beg_pos.lineno);
    return qcall;
}

static NODE*
new_command_qcall(struct parser_params* p, ID atype, NODE *recv, ID mid, NODE *args, NODE *block, const YYLTYPE *op_loc, const YYLTYPE *loc)
{
    NODE *ret;
    if (block) block_dup_check(p, args, block);
    ret = new_qcall(p, atype, recv, mid, args, op_loc, loc);
    if (block) ret = method_add_block(p, ret, block, loc);
    fixpos(ret, recv);
    return ret;
}

#define nd_once_body(node) (nd_type(node) == NODE_ONCE ? (node)->nd_body : node)
static NODE*
match_op(struct parser_params *p, NODE *node1, NODE *node2, const YYLTYPE *op_loc, const YYLTYPE *loc)
{
    NODE *n;
    int line = op_loc->beg_pos.lineno;

    value_expr(node1);
    value_expr(node2);
    if (node1 && (n = nd_once_body(node1)) != 0) {
	switch (nd_type(n)) {
	  case NODE_DREGX:
	    {
		NODE *match = NEW_MATCH2(node1, node2, loc);
		nd_set_line(match, line);
		return match;
	    }

	  case NODE_LIT:
	    if (RB_TYPE_P(n->nd_lit, T_REGEXP)) {
		const VALUE lit = n->nd_lit;
		NODE *match = NEW_MATCH2(node1, node2, loc);
		match->nd_args = reg_named_capture_assign(p, lit, loc);
		nd_set_line(match, line);
		return match;
	    }
	}
    }

    if (node2 && (n = nd_once_body(node2)) != 0) {
        NODE *match3;

	switch (nd_type(n)) {
	  case NODE_LIT:
	    if (!RB_TYPE_P(n->nd_lit, T_REGEXP)) break;
	    /* fallthru */
	  case NODE_DREGX:
	    match3 = NEW_MATCH3(node2, node1, loc);
	    return match3;
	}
    }

    n = NEW_CALL(node1, tMATCH, NEW_LIST(node2, &node2->nd_loc), loc);
    nd_set_line(n, line);
    return n;
}

# if WARN_PAST_SCOPE
static int
past_dvar_p(struct parser_params *p, ID id)
{
    struct vtable *past = p->lvtbl->past;
    while (past) {
	if (vtable_included(past, id)) return 1;
	past = past->prev;
    }
    return 0;
}
# endif

static int
numparam_nested_p(struct parser_params *p)
{
    struct local_vars *local = p->lvtbl;
    NODE *outer = local->numparam.outer;
    NODE *inner = local->numparam.inner;
    if (outer || inner) {
	NODE *used = outer ? outer : inner;
	compile_error(p, "numbered parameter is already used in\n"
		      "%s:%d: %s block here",
		      p->ruby_sourcefile, nd_line(used),
		      outer ? "outer" : "inner");
	parser_show_error_line(p, &used->nd_loc);
	return 1;
    }
    return 0;
}

static NODE*
gettable(struct parser_params *p, ID id, const YYLTYPE *loc)
{
    ID *vidp = NULL;
    NODE *node;
    switch (id) {
      case keyword_self:
	return NEW_SELF(loc);
      case keyword_nil:
	return NEW_NIL(loc);
      case keyword_true:
	return NEW_TRUE(loc);
      case keyword_false:
	return NEW_FALSE(loc);
      case keyword__FILE__:
	{
	    VALUE file = p->ruby_sourcefile_string;
	    if (NIL_P(file))
		file = rb_str_new(0, 0);
	    else
		file = rb_str_dup(file);
	    node = NEW_STR(file, loc);
            RB_OBJ_WRITTEN(p->ast, Qnil, file);
	}
	return node;
      case keyword__LINE__:
	return NEW_LIT(INT2FIX(p->tokline), loc);
      case keyword__ENCODING__:
        node = NEW_LIT(rb_enc_from_encoding(p->enc), loc);
        RB_OBJ_WRITTEN(p->ast, Qnil, node->nd_lit);
        return node;

    }
    switch (id_type(id)) {
      case ID_LOCAL:
	if (dyna_in_block(p) && dvar_defined_ref(p, id, &vidp)) {
	    if (NUMPARAM_ID_P(id) && numparam_nested_p(p)) return 0;
	    if (id == p->cur_arg) {
                compile_error(p, "circular argument reference - %"PRIsWARN, rb_id2str(id));
                return 0;
	    }
	    if (vidp) *vidp |= LVAR_USED;
	    node = NEW_DVAR(id, loc);
	    return node;
	}
	if (local_id_ref(p, id, &vidp)) {
	    if (id == p->cur_arg) {
                compile_error(p, "circular argument reference - %"PRIsWARN, rb_id2str(id));
                return 0;
	    }
	    if (vidp) *vidp |= LVAR_USED;
	    node = NEW_LVAR(id, loc);
	    return node;
	}
	if (dyna_in_block(p) && NUMPARAM_ID_P(id) &&
	    parser_numbered_param(p, NUMPARAM_ID_TO_IDX(id))) {
	    if (numparam_nested_p(p)) return 0;
	    node = NEW_DVAR(id, loc);
	    struct local_vars *local = p->lvtbl;
	    if (!local->numparam.current) local->numparam.current = node;
	    return node;
	}
# if WARN_PAST_SCOPE
	if (!p->ctxt.in_defined && RTEST(ruby_verbose) && past_dvar_p(p, id)) {
	    rb_warning1("possible reference to past scope - %"PRIsWARN, rb_id2str(id));
	}
# endif
	/* method call without arguments */
	return NEW_VCALL(id, loc);
      case ID_GLOBAL:
	return NEW_GVAR(id, loc);
      case ID_INSTANCE:
	return NEW_IVAR(id, loc);
      case ID_CONST:
	return NEW_CONST(id, loc);
      case ID_CLASS:
	return NEW_CVAR(id, loc);
    }
    compile_error(p, "identifier %"PRIsVALUE" is not valid to get", rb_id2str(id));
    return 0;
}

static NODE *
opt_arg_append(NODE *opt_list, NODE *opt)
{
    NODE *opts = opt_list;
    opts->nd_loc.end_pos = opt->nd_loc.end_pos;

    while (opts->nd_next) {
	opts = opts->nd_next;
	opts->nd_loc.end_pos = opt->nd_loc.end_pos;
    }
    opts->nd_next = opt;

    return opt_list;
}

static NODE *
kwd_append(NODE *kwlist, NODE *kw)
{
    if (kwlist) {
	NODE *kws = kwlist;
	kws->nd_loc.end_pos = kw->nd_loc.end_pos;
	while (kws->nd_next) {
	    kws = kws->nd_next;
	    kws->nd_loc.end_pos = kw->nd_loc.end_pos;
	}
	kws->nd_next = kw;
    }
    return kwlist;
}

static NODE *
new_defined(struct parser_params *p, NODE *expr, const YYLTYPE *loc)
{
    return NEW_DEFINED(remove_begin_all(expr), loc);
}

static NODE*
symbol_append(struct parser_params *p, NODE *symbols, NODE *symbol)
{
    if (nd_type(symbol) == NODE_DSTR) {
	nd_set_type(symbol, NODE_DSYM);
    }
    else {
	nd_set_type(symbol, NODE_LIT);
	RB_OBJ_WRITTEN(p->ast, Qnil, symbol->nd_lit = rb_str_intern(symbol->nd_lit));
    }
    return list_append(p, symbols, symbol);
}

static NODE *
new_regexp(struct parser_params *p, NODE *node, int options, const YYLTYPE *loc)
{
    NODE *list, *prev;
    VALUE lit;

    if (!node) {
	node = NEW_LIT(reg_compile(p, STR_NEW0(), options), loc);
	RB_OBJ_WRITTEN(p->ast, Qnil, node->nd_lit);
        return node;
    }
    switch (nd_type(node)) {
      case NODE_STR:
	{
	    VALUE src = node->nd_lit;
	    nd_set_type(node, NODE_LIT);
	    nd_set_loc(node, loc);
	    RB_OBJ_WRITTEN(p->ast, Qnil, node->nd_lit = reg_compile(p, src, options));
	}
	break;
      default:
	lit = STR_NEW0();
	node = NEW_NODE(NODE_DSTR, lit, 1, NEW_LIST(node, loc), loc);
        RB_OBJ_WRITTEN(p->ast, Qnil, lit);
	/* fall through */
      case NODE_DSTR:
	nd_set_type(node, NODE_DREGX);
	nd_set_loc(node, loc);
	node->nd_cflag = options & RE_OPTION_MASK;
	if (!NIL_P(node->nd_lit)) reg_fragment_check(p, node->nd_lit, options);
	for (list = (prev = node)->nd_next; list; list = list->nd_next) {
	    NODE *frag = list->nd_head;
	    enum node_type type = nd_type(frag);
	    if (type == NODE_STR || (type == NODE_DSTR && !frag->nd_next)) {
		VALUE tail = frag->nd_lit;
		if (reg_fragment_check(p, tail, options) && prev && !NIL_P(prev->nd_lit)) {
		    VALUE lit = prev == node ? prev->nd_lit : prev->nd_head->nd_lit;
		    if (!literal_concat0(p, lit, tail)) {
			return NEW_NIL(loc); /* dummy node on error */
		    }
		    rb_str_resize(tail, 0);
		    prev->nd_next = list->nd_next;
		    rb_discard_node(p, list->nd_head);
		    rb_discard_node(p, list);
		    list = prev;
		}
		else {
		    prev = list;
		}
	    }
	    else {
		prev = 0;
	    }
	}
	if (!node->nd_next) {
	    VALUE src = node->nd_lit;
	    nd_set_type(node, NODE_LIT);
	    RB_OBJ_WRITTEN(p->ast, Qnil, node->nd_lit = reg_compile(p, src, options));
	}
	if (options & RE_OPTION_ONCE) {
	    node = NEW_NODE(NODE_ONCE, 0, node, 0, loc);
	}
	break;
    }
    return node;
}

static NODE *
new_kw_arg(struct parser_params *p, NODE *k, const YYLTYPE *loc)
{
    if (!k) return 0;
    return NEW_KW_ARG(0, (k), loc);
}

static NODE *
new_xstring(struct parser_params *p, NODE *node, const YYLTYPE *loc)
{
    if (!node) {
	VALUE lit = STR_NEW0();
	NODE *xstr = NEW_XSTR(lit, loc);
	RB_OBJ_WRITTEN(p->ast, Qnil, lit);
	return xstr;
    }
    switch (nd_type(node)) {
      case NODE_STR:
	nd_set_type(node, NODE_XSTR);
	nd_set_loc(node, loc);
	break;
      case NODE_DSTR:
	nd_set_type(node, NODE_DXSTR);
	nd_set_loc(node, loc);
	break;
      default:
	node = NEW_NODE(NODE_DXSTR, Qnil, 1, NEW_LIST(node, loc), loc);
	break;
    }
    return node;
}

static void
check_literal_when(struct parser_params *p, NODE *arg, const YYLTYPE *loc)
{
    VALUE lit;

    if (!arg || !p->case_labels) return;

    lit = rb_node_case_when_optimizable_literal(arg);
    if (lit == Qundef) return;
    if (nd_type(arg) == NODE_STR) {
	RB_OBJ_WRITTEN(p->ast, Qnil, arg->nd_lit = lit);
    }

    if (NIL_P(p->case_labels)) {
	p->case_labels = rb_obj_hide(rb_hash_new());
    }
    else {
	VALUE line = rb_hash_lookup(p->case_labels, lit);
	if (!NIL_P(line)) {
	    rb_warning1("duplicated `when' clause with line %d is ignored",
			WARN_IVAL(line));
	    return;
	}
    }
    rb_hash_aset(p->case_labels, lit, INT2NUM(p->ruby_sourceline));
}

#else  /* !RIPPER */
static int
id_is_var(struct parser_params *p, ID id)
{
    if (is_notop_id(id)) {
	switch (id & ID_SCOPE_MASK) {
	  case ID_GLOBAL: case ID_INSTANCE: case ID_CONST: case ID_CLASS:
	    return 1;
	  case ID_LOCAL:
	    if (dyna_in_block(p)) {
		if (NUMPARAM_ID_P(id) || dvar_defined(p, id)) return 1;
	    }
	    if (local_id(p, id)) return 1;
	    /* method call without arguments */
	    return 0;
	}
    }
    compile_error(p, "identifier %"PRIsVALUE" is not valid to get", rb_id2str(id));
    return 0;
}

static VALUE
new_regexp(struct parser_params *p, VALUE re, VALUE opt, const YYLTYPE *loc)
{
    VALUE src = 0, err;
    int options = 0;
    if (ripper_is_node_yylval(re)) {
	src = RNODE(re)->nd_cval;
	re = RNODE(re)->nd_rval;
    }
    if (ripper_is_node_yylval(opt)) {
	options = (int)RNODE(opt)->nd_tag;
	opt = RNODE(opt)->nd_rval;
    }
    if (src && NIL_P(parser_reg_compile(p, src, options, &err))) {
	compile_error(p, "%"PRIsVALUE, err);
    }
    return dispatch2(regexp_literal, re, opt);
}
#endif /* !RIPPER */


#ifndef RIPPER
static const char rb_parser_lex_state_names[][8] = {
    "BEG",    "END",    "ENDARG", "ENDFN",  "ARG",
    "CMDARG", "MID",    "FNAME",  "DOT",    "CLASS",
    "LABEL",  "LABELED","FITEM",
};

static VALUE
append_lex_state_name(enum lex_state_e state, VALUE buf)
{
    int i, sep = 0;
    unsigned int mask = 1;
    static const char none[] = "NONE";

    for (i = 0; i < EXPR_MAX_STATE; ++i, mask <<= 1) {
	if ((unsigned)state & mask) {
	    if (sep) {
		rb_str_cat(buf, "|", 1);
	    }
	    sep = 1;
	    rb_str_cat_cstr(buf, rb_parser_lex_state_names[i]);
	}
    }
    if (!sep) {
	rb_str_cat(buf, none, sizeof(none)-1);
    }
    return buf;
}

static void
flush_debug_buffer(struct parser_params *p, VALUE out, VALUE str)
{
    VALUE mesg = p->debug_buffer;

    if (!NIL_P(mesg) && RSTRING_LEN(mesg)) {
	p->debug_buffer = Qnil;
	rb_io_puts(1, &mesg, out);
    }
    if (!NIL_P(str) && RSTRING_LEN(str)) {
	rb_io_write(p->debug_output, str);
    }
}

enum lex_state_e
rb_parser_trace_lex_state(struct parser_params *p, enum lex_state_e from,
			  enum lex_state_e to, int line)
{
    VALUE mesg;
    mesg = rb_str_new_cstr("lex_state: ");
    append_lex_state_name(from, mesg);
    rb_str_cat_cstr(mesg, " -> ");
    append_lex_state_name(to, mesg);
    rb_str_catf(mesg, " at line %d\n", line);
    flush_debug_buffer(p, p->debug_output, mesg);
    return to;
}

VALUE
rb_parser_lex_state_name(enum lex_state_e state)
{
    return rb_fstring(append_lex_state_name(state, rb_str_new(0, 0)));
}

static void
append_bitstack_value(stack_type stack, VALUE mesg)
{
    if (stack == 0) {
	rb_str_cat_cstr(mesg, "0");
    }
    else {
	stack_type mask = (stack_type)1U << (CHAR_BIT * sizeof(stack_type) - 1);
	for (; mask && !(stack & mask); mask >>= 1) continue;
	for (; mask; mask >>= 1) rb_str_cat(mesg, stack & mask ? "1" : "0", 1);
    }
}

void
rb_parser_show_bitstack(struct parser_params *p, stack_type stack,
			const char *name, int line)
{
    VALUE mesg = rb_sprintf("%s: ", name);
    append_bitstack_value(stack, mesg);
    rb_str_catf(mesg, " at line %d\n", line);
    flush_debug_buffer(p, p->debug_output, mesg);
}

void
rb_parser_fatal(struct parser_params *p, const char *fmt, ...)
{
    va_list ap;
    VALUE mesg = rb_str_new_cstr("internal parser error: ");

    va_start(ap, fmt);
    rb_str_vcatf(mesg, fmt, ap);
    va_end(ap);
    parser_yyerror(p, NULL, RSTRING_PTR(mesg));
    RB_GC_GUARD(mesg);

    mesg = rb_str_new(0, 0);
    append_lex_state_name(p->lex.state, mesg);
    compile_error(p, "lex.state: %"PRIsVALUE, mesg);
    rb_str_resize(mesg, 0);
    append_bitstack_value(p->cond_stack, mesg);
    compile_error(p, "cond_stack: %"PRIsVALUE, mesg);
    rb_str_resize(mesg, 0);
    append_bitstack_value(p->cmdarg_stack, mesg);
    compile_error(p, "cmdarg_stack: %"PRIsVALUE, mesg);
    if (p->debug_output == rb_ractor_stdout())
	p->debug_output = rb_ractor_stderr();
    p->debug = TRUE;
}

YYLTYPE *
rb_parser_set_location_from_strterm_heredoc(struct parser_params *p, rb_strterm_heredoc_t *here, YYLTYPE *yylloc)
{
    int sourceline = here->sourceline;
    int beg_pos = (int)here->offset - here->quote
	- (rb_strlen_lit("<<-") - !(here->func & STR_FUNC_INDENT));
    int end_pos = (int)here->offset + here->length + here->quote;

    yylloc->beg_pos.lineno = sourceline;
    yylloc->beg_pos.column = beg_pos;
    yylloc->end_pos.lineno = sourceline;
    yylloc->end_pos.column = end_pos;
    return yylloc;
}

YYLTYPE *
rb_parser_set_location_of_none(struct parser_params *p, YYLTYPE *yylloc)
{
    yylloc->beg_pos.lineno = p->ruby_sourceline;
    yylloc->beg_pos.column = (int)(p->lex.ptok - p->lex.pbeg);
    yylloc->end_pos.lineno = p->ruby_sourceline;
    yylloc->end_pos.column = (int)(p->lex.ptok - p->lex.pbeg);
    return yylloc;
}

YYLTYPE *
rb_parser_set_location(struct parser_params *p, YYLTYPE *yylloc)
{
    yylloc->beg_pos.lineno = p->ruby_sourceline;
    yylloc->beg_pos.column = (int)(p->lex.ptok - p->lex.pbeg);
    yylloc->end_pos.lineno = p->ruby_sourceline;
    yylloc->end_pos.column = (int)(p->lex.pcur - p->lex.pbeg);
    return yylloc;
}
#endif /* !RIPPER */

static void
parser_token_value_print(struct parser_params *p, enum yytokentype type, const YYSTYPE *valp)
{
    VALUE v;

    switch (type) {
      case tIDENTIFIER: case tFID: case tGVAR: case tIVAR:
      case tCONSTANT: case tCVAR: case tLABEL: case tOP_ASGN:
#ifndef RIPPER
	v = rb_id2str(valp->id);
#else
	v = valp->node->nd_rval;
#endif
	rb_parser_printf(p, "%"PRIsVALUE, v);
	break;
      case tINTEGER: case tFLOAT: case tRATIONAL: case tIMAGINARY:
      case tSTRING_CONTENT: case tCHAR:
#ifndef RIPPER
	v = valp->node->nd_lit;
#else
	v = valp->val;
#endif
	rb_parser_printf(p, "%+"PRIsVALUE, v);
	break;
      case tNTH_REF:
#ifndef RIPPER
	rb_parser_printf(p, "$%ld", valp->node->nd_nth);
#else
	rb_parser_printf(p, "%"PRIsVALUE, valp->val);
#endif
	break;
      case tBACK_REF:
#ifndef RIPPER
	rb_parser_printf(p, "$%c", (int)valp->node->nd_nth);
#else
	rb_parser_printf(p, "%"PRIsVALUE, valp->val);
#endif
	break;
      default:
	break;
    }
}

static int
assignable0(struct parser_params *p, ID id, const char **err)
{
    if (!id) return -1;
    switch (id) {
      case keyword_self:
	*err = "Can't change the value of self";
	return -1;
      case keyword_nil:
	*err = "Can't assign to nil";
	return -1;
      case keyword_true:
	*err = "Can't assign to true";
	return -1;
      case keyword_false:
	*err = "Can't assign to false";
	return -1;
      case keyword__FILE__:
	*err = "Can't assign to __FILE__";
	return -1;
      case keyword__LINE__:
	*err = "Can't assign to __LINE__";
	return -1;
      case keyword__ENCODING__:
	*err = "Can't assign to __ENCODING__";
	return -1;
    }
    switch (id_type(id)) {
      case ID_LOCAL:
	if (dyna_in_block(p)) {
	    if (p->max_numparam > NO_PARAM && NUMPARAM_ID_P(id)) {
		compile_error(p, "Can't assign to numbered parameter _%d",
			      NUMPARAM_ID_TO_IDX(id));
		return -1;
	    }
	    if (dvar_curr(p, id)) return NODE_DASGN_CURR;
	    if (dvar_defined(p, id)) return NODE_DASGN;
	    if (local_id(p, id)) return NODE_LASGN;
	    dyna_var(p, id);
	    return NODE_DASGN_CURR;
	}
	else {
	    if (!local_id(p, id)) local_var(p, id);
	    return NODE_LASGN;
	}
	break;
      case ID_GLOBAL: return NODE_GASGN;
      case ID_INSTANCE: return NODE_IASGN;
      case ID_CONST:
	if (!p->ctxt.in_def) return NODE_CDECL;
	*err = "dynamic constant assignment";
	return -1;
      case ID_CLASS: return NODE_CVASGN;
      default:
	compile_error(p, "identifier %"PRIsVALUE" is not valid to set", rb_id2str(id));
    }
    return -1;
}

#ifndef RIPPER
static NODE*
assignable(struct parser_params *p, ID id, NODE *val, const YYLTYPE *loc)
{
    const char *err = 0;
    int node_type = assignable0(p, id, &err);
    switch (node_type) {
      case NODE_DASGN_CURR: return NEW_DASGN_CURR(id, val, loc);
      case NODE_DASGN: return NEW_DASGN(id, val, loc);
      case NODE_LASGN: return NEW_LASGN(id, val, loc);
      case NODE_GASGN: return NEW_GASGN(id, val, loc);
      case NODE_IASGN: return NEW_IASGN(id, val, loc);
      case NODE_CDECL: return NEW_CDECL(id, val, 0, loc);
      case NODE_CVASGN: return NEW_CVASGN(id, val, loc);
    }
    if (err) yyerror1(loc, err);
    return NEW_BEGIN(0, loc);
}
#else
static VALUE
assignable(struct parser_params *p, VALUE lhs)
{
    const char *err = 0;
    assignable0(p, get_id(lhs), &err);
    if (err) lhs = assign_error(p, err, lhs);
    return lhs;
}
#endif

static int
is_private_local_id(ID name)
{
    VALUE s;
    if (name == idUScore) return 1;
    if (!is_local_id(name)) return 0;
    s = rb_id2str(name);
    if (!s) return 0;
    return RSTRING_PTR(s)[0] == '_';
}

static int
shadowing_lvar_0(struct parser_params *p, ID name)
{
    if (is_private_local_id(name)) return 1;
    if (dyna_in_block(p)) {
	if (dvar_curr(p, name)) {
	    yyerror0("duplicated argument name");
	}
	else if (dvar_defined(p, name) || local_id(p, name)) {
	    vtable_add(p->lvtbl->vars, name);
	    if (p->lvtbl->used) {
		vtable_add(p->lvtbl->used, (ID)p->ruby_sourceline | LVAR_USED);
	    }
	    return 0;
	}
    }
    else {
	if (local_id(p, name)) {
	    yyerror0("duplicated argument name");
	}
    }
    return 1;
}

static ID
shadowing_lvar(struct parser_params *p, ID name)
{
    shadowing_lvar_0(p, name);
    return name;
}

static void
new_bv(struct parser_params *p, ID name)
{
    if (!name) return;
    if (!is_local_id(name)) {
	compile_error(p, "invalid local variable - %"PRIsVALUE,
		      rb_id2str(name));
	return;
    }
    if (!shadowing_lvar_0(p, name)) return;
    dyna_var(p, name);
}

#ifndef RIPPER
static NODE *
aryset(struct parser_params *p, NODE *recv, NODE *idx, const YYLTYPE *loc)
{
    return NEW_ATTRASGN(recv, tASET, idx, loc);
}

static void
block_dup_check(struct parser_params *p, NODE *node1, NODE *node2)
{
    if (node2 && node1 && nd_type(node1) == NODE_BLOCK_PASS) {
	compile_error(p, "both block arg and actual block given");
    }
}

static NODE *
attrset(struct parser_params *p, NODE *recv, ID atype, ID id, const YYLTYPE *loc)
{
    if (!CALL_Q_P(atype)) id = rb_id_attrset(id);
    return NEW_ATTRASGN(recv, id, 0, loc);
}

static void
rb_backref_error(struct parser_params *p, NODE *node)
{
    switch (nd_type(node)) {
      case NODE_NTH_REF:
	compile_error(p, "Can't set variable $%ld", node->nd_nth);
	break;
      case NODE_BACK_REF:
	compile_error(p, "Can't set variable $%c", (int)node->nd_nth);
	break;
    }
}
#else
static VALUE
backref_error(struct parser_params *p, NODE *ref, VALUE expr)
{
    VALUE mesg = rb_str_new_cstr("Can't set variable ");
    rb_str_append(mesg, ref->nd_cval);
    return dispatch2(assign_error, mesg, expr);
}
#endif

#ifndef RIPPER
static NODE *
arg_append(struct parser_params *p, NODE *node1, NODE *node2, const YYLTYPE *loc)
{
    if (!node1) return NEW_LIST(node2, &node2->nd_loc);
    switch (nd_type(node1))  {
      case NODE_LIST:
	return list_append(p, node1, node2);
      case NODE_BLOCK_PASS:
	node1->nd_head = arg_append(p, node1->nd_head, node2, loc);
	node1->nd_loc.end_pos = node1->nd_head->nd_loc.end_pos;
	return node1;
      case NODE_ARGSPUSH:
	node1->nd_body = list_append(p, NEW_LIST(node1->nd_body, &node1->nd_body->nd_loc), node2);
	node1->nd_loc.end_pos = node1->nd_body->nd_loc.end_pos;
	nd_set_type(node1, NODE_ARGSCAT);
	return node1;
      case NODE_ARGSCAT:
        if (nd_type(node1->nd_body) != NODE_LIST) break;
        node1->nd_body = list_append(p, node1->nd_body, node2);
        node1->nd_loc.end_pos = node1->nd_body->nd_loc.end_pos;
        return node1;
    }
    return NEW_ARGSPUSH(node1, node2, loc);
}

static NODE *
arg_concat(struct parser_params *p, NODE *node1, NODE *node2, const YYLTYPE *loc)
{
    if (!node2) return node1;
    switch (nd_type(node1)) {
      case NODE_BLOCK_PASS:
	if (node1->nd_head)
	    node1->nd_head = arg_concat(p, node1->nd_head, node2, loc);
	else
	    node1->nd_head = NEW_LIST(node2, loc);
	return node1;
      case NODE_ARGSPUSH:
	if (nd_type(node2) != NODE_LIST) break;
	node1->nd_body = list_concat(NEW_LIST(node1->nd_body, loc), node2);
	nd_set_type(node1, NODE_ARGSCAT);
	return node1;
      case NODE_ARGSCAT:
	if (nd_type(node2) != NODE_LIST ||
	    nd_type(node1->nd_body) != NODE_LIST) break;
	node1->nd_body = list_concat(node1->nd_body, node2);
	return node1;
    }
    return NEW_ARGSCAT(node1, node2, loc);
}

static NODE *
last_arg_append(struct parser_params *p, NODE *args, NODE *last_arg, const YYLTYPE *loc)
{
    NODE *n1;
    if ((n1 = splat_array(args)) != 0) {
	return list_append(p, n1, last_arg);
    }
    return arg_append(p, args, last_arg, loc);
}

static NODE *
rest_arg_append(struct parser_params *p, NODE *args, NODE *rest_arg, const YYLTYPE *loc)
{
    NODE *n1;
    if ((nd_type(rest_arg) == NODE_LIST) && (n1 = splat_array(args)) != 0) {
	return list_concat(n1, rest_arg);
    }
    return arg_concat(p, args, rest_arg, loc);
}

static NODE *
splat_array(NODE* node)
{
    if (nd_type(node) == NODE_SPLAT) node = node->nd_head;
    if (nd_type(node) == NODE_LIST) return node;
    return 0;
}

static void
mark_lvar_used(struct parser_params *p, NODE *rhs)
{
    ID *vidp = NULL;
    if (!rhs) return;
    switch (nd_type(rhs)) {
      case NODE_LASGN:
	if (local_id_ref(p, rhs->nd_vid, &vidp)) {
	    if (vidp) *vidp |= LVAR_USED;
	}
	break;
      case NODE_DASGN:
      case NODE_DASGN_CURR:
	if (dvar_defined_ref(p, rhs->nd_vid, &vidp)) {
	    if (vidp) *vidp |= LVAR_USED;
	}
	break;
#if 0
      case NODE_MASGN:
	for (rhs = rhs->nd_head; rhs; rhs = rhs->nd_next) {
	    mark_lvar_used(p, rhs->nd_head);
	}
	break;
#endif
    }
}

extern VALUE rb_mRubyVMFrozenCore;

static NODE *
shareable_literal_node(struct parser_params *p, NODE *value, const YYLTYPE *loc)
{
    NODE *fcore = NEW_LIT(rb_mRubyVMFrozenCore, loc);
    return NEW_CALL(fcore, rb_intern("make_shareable"),
		    NEW_LIST(value, loc), loc);
}

static int is_static_content(NODE *node);

static VALUE
shareable_literal_value(NODE *node)
{
    if (!node) return Qnil;
    enum node_type type = nd_type(node);
    switch (type) {
      case NODE_TRUE:
	return Qtrue;
      case NODE_FALSE:
	return Qfalse;
      case NODE_NIL:
	return Qnil;
      case NODE_LIT:
	return node->nd_lit;
      default:
	return Qundef;
    }
}

VALUE rb_ractor_make_shareable(VALUE obj);

static NODE *
shareable_literal_constant(struct parser_params *p, NODE *value, enum shareability shareable, const YYLTYPE *loc)
{
    VALUE lit;

    if (!value) return 0;
    enum node_type type = nd_type(value);
    switch (type) {
      case NODE_TRUE:
      case NODE_FALSE:
      case NODE_NIL:
      case NODE_LIT:
      case NODE_DSTR:
	break;

      case NODE_STR:
	lit = rb_fstring(value->nd_lit);
	nd_set_type(value, NODE_LIT);
	RB_OBJ_WRITE(p->ast, &value->nd_lit, lit);
	break;

      case NODE_ZLIST:
	nd_set_type(value, NODE_LIT);
	RB_OBJ_WRITE(p->ast, &value->nd_lit, rb_ary_new());
	break;

      case NODE_LIST:
	lit = rb_ary_new();
	for (NODE *n = value; n; n = n->nd_next) {
	    NODE *elt = n->nd_head;
	    if (elt && !(elt = shareable_literal_constant(p, elt, shareable, &elt->nd_loc))) {
		if (lit) {
		    rb_ary_clear(lit);
		    lit = Qfalse;
		}
		continue;
	    }
	    if (lit) {
		VALUE e = shareable_literal_value(elt);
		if (e != Qundef) {
		    rb_ary_push(lit, e);
		}
		else {
		    rb_ary_clear(lit);
		    lit = Qfalse;
		}
	    }
	}
	if (!lit) return 0;
	nd_set_type(value, NODE_LIT);
	RB_OBJ_WRITE(p->ast, &value->nd_lit, rb_ractor_make_shareable(lit));
	break;

      case NODE_HASH:
	if (!value->nd_brace) return 0;
	lit = rb_hash_new();
	for (NODE *n = value->nd_head; n; n = n->nd_next->nd_next) {
	    NODE *key = n->nd_head;
	    NODE *val = n->nd_next->nd_head;
	    if ((key && !(key = shareable_literal_constant(p, key, shareable, &key->nd_loc))) ||
		(val && !(val = shareable_literal_constant(p, val, shareable, &val->nd_loc)))) {
		if (lit) {
		    rb_hash_clear(lit);
		    lit = Qfalse;
		}
		continue;
	    }
	    if (lit) {
		VALUE k = shareable_literal_value(key);
		VALUE v = shareable_literal_value(val);
		if (k != Qundef && v != Qundef) {
		    rb_hash_aset(lit, k, v);
		}
		else {
		    rb_hash_clear(lit);
		    lit = Qfalse;
		}
	    }
	}
	if (!lit) return 0;
	nd_set_type(value, NODE_LIT);
	RB_OBJ_WRITE(p->ast, &value->nd_lit, rb_ractor_make_shareable(lit));
	break;

      default:
	if (shareable == shareable_literal)
	    yyerror1(loc, "unshareable expression");
	return 0;
    }
    return value;
}

static NODE *
shareable_constant_value(struct parser_params *p, NODE *value, enum shareability shareable, const YYLTYPE *loc)
{
    if (!value) return 0;
    switch (shareable) {
      case shareable_none:
	return value;

      case shareable_literal:
      case shareable_everything:
	{
	    NODE *lit = shareable_literal_constant(p, value, shareable, loc);
	    if (lit) return lit;
	}
	break;

      default:
	UNREACHABLE_RETURN(0);
    }

    return shareable_literal_node(p, value, loc);
}

static NODE *
node_assign(struct parser_params *p, NODE *lhs, NODE *rhs, struct lex_context ctxt, const YYLTYPE *loc)
{
    if (!lhs) return 0;

    switch (nd_type(lhs)) {
      case NODE_CDECL:
	rhs = shareable_constant_value(p, rhs, ctxt.shareable_constant_value, loc);
	/* fallthru */

      case NODE_GASGN:
      case NODE_IASGN:
      case NODE_LASGN:
      case NODE_DASGN:
      case NODE_DASGN_CURR:
      case NODE_MASGN:
      case NODE_CVASGN:
	lhs->nd_value = rhs;
	nd_set_loc(lhs, loc);
	break;

      case NODE_ATTRASGN:
	lhs->nd_args = arg_append(p, lhs->nd_args, rhs, loc);
	nd_set_loc(lhs, loc);
	break;

      default:
	/* should not happen */
	break;
    }

    return lhs;
}

static NODE *
value_expr_check(struct parser_params *p, NODE *node)
{
    NODE *void_node = 0, *vn;

    if (!node) {
	rb_warning0("empty expression");
    }
    while (node) {
	switch (nd_type(node)) {
	  case NODE_RETURN:
	  case NODE_BREAK:
	  case NODE_NEXT:
	  case NODE_REDO:
	  case NODE_RETRY:
	    return void_node ? void_node : node;

	  case NODE_CASE3:
	    if (!node->nd_body || nd_type(node->nd_body) != NODE_IN) {
		compile_error(p, "unexpected node");
		return NULL;
	    }
	    if (node->nd_body->nd_body) {
		return NULL;
	    }
	    /* single line pattern matching */
	    return void_node ? void_node : node;

	  case NODE_BLOCK:
	    while (node->nd_next) {
		node = node->nd_next;
	    }
	    node = node->nd_head;
	    break;

	  case NODE_BEGIN:
	    node = node->nd_body;
	    break;

	  case NODE_IF:
	  case NODE_UNLESS:
	    if (!node->nd_body) {
		return NULL;
	    }
	    else if (!node->nd_else) {
		return NULL;
	    }
	    vn = value_expr_check(p, node->nd_body);
	    if (!vn) return NULL;
	    if (!void_node) void_node = vn;
	    node = node->nd_else;
	    break;

	  case NODE_AND:
	  case NODE_OR:
	    node = node->nd_1st;
	    break;

	  case NODE_LASGN:
	  case NODE_DASGN:
	  case NODE_DASGN_CURR:
	  case NODE_MASGN:
	    mark_lvar_used(p, node);
	    return NULL;

	  default:
	    return NULL;
	}
    }

    return NULL;
}

static int
value_expr_gen(struct parser_params *p, NODE *node)
{
    NODE *void_node = value_expr_check(p, node);
    if (void_node) {
	yyerror1(&void_node->nd_loc, "void value expression");
	/* or "control never reach"? */
	return FALSE;
    }
    return TRUE;
}
static void
void_expr(struct parser_params *p, NODE *node)
{
    const char *useless = 0;

    if (!RTEST(ruby_verbose)) return;

    if (!node || !(node = nd_once_body(node))) return;
    switch (nd_type(node)) {
      case NODE_OPCALL:
	switch (node->nd_mid) {
	  case '+':
	  case '-':
	  case '*':
	  case '/':
	  case '%':
	  case tPOW:
	  case tUPLUS:
	  case tUMINUS:
	  case '|':
	  case '^':
	  case '&':
	  case tCMP:
	  case '>':
	  case tGEQ:
	  case '<':
	  case tLEQ:
	  case tEQ:
	  case tNEQ:
	    useless = rb_id2name(node->nd_mid);
	    break;
	}
	break;

      case NODE_LVAR:
      case NODE_DVAR:
      case NODE_GVAR:
      case NODE_IVAR:
      case NODE_CVAR:
      case NODE_NTH_REF:
      case NODE_BACK_REF:
	useless = "a variable";
	break;
      case NODE_CONST:
	useless = "a constant";
	break;
      case NODE_LIT:
      case NODE_STR:
      case NODE_DSTR:
      case NODE_DREGX:
	useless = "a literal";
	break;
      case NODE_COLON2:
      case NODE_COLON3:
	useless = "::";
	break;
      case NODE_DOT2:
	useless = "..";
	break;
      case NODE_DOT3:
	useless = "...";
	break;
      case NODE_SELF:
	useless = "self";
	break;
      case NODE_NIL:
	useless = "nil";
	break;
      case NODE_TRUE:
	useless = "true";
	break;
      case NODE_FALSE:
	useless = "false";
	break;
      case NODE_DEFINED:
	useless = "defined?";
	break;
    }

    if (useless) {
	rb_warn1L(nd_line(node), "possibly useless use of %s in void context", WARN_S(useless));
    }
}

static NODE *
void_stmts(struct parser_params *p, NODE *node)
{
    NODE *const n = node;
    if (!RTEST(ruby_verbose)) return n;
    if (!node) return n;
    if (nd_type(node) != NODE_BLOCK) return n;

    while (node->nd_next) {
	void_expr(p, node->nd_head);
	node = node->nd_next;
    }
    return n;
}

static NODE *
remove_begin(NODE *node)
{
    NODE **n = &node, *n1 = node;
    while (n1 && nd_type(n1) == NODE_BEGIN && n1->nd_body) {
	*n = n1 = n1->nd_body;
    }
    return node;
}

static NODE *
remove_begin_all(NODE *node)
{
    NODE **n = &node, *n1 = node;
    while (n1 && nd_type(n1) == NODE_BEGIN) {
	*n = n1 = n1->nd_body;
    }
    return node;
}

static void
reduce_nodes(struct parser_params *p, NODE **body)
{
    NODE *node = *body;

    if (!node) {
	*body = NEW_NIL(&NULL_LOC);
	return;
    }
#define subnodes(n1, n2) \
    ((!node->n1) ? (node->n2 ? (body = &node->n2, 1) : 0) : \
     (!node->n2) ? (body = &node->n1, 1) : \
     (reduce_nodes(p, &node->n1), body = &node->n2, 1))

    while (node) {
	int newline = (int)(node->flags & NODE_FL_NEWLINE);
	switch (nd_type(node)) {
	  end:
	  case NODE_NIL:
	    *body = 0;
	    return;
	  case NODE_RETURN:
	    *body = node = node->nd_stts;
	    if (newline && node) node->flags |= NODE_FL_NEWLINE;
	    continue;
	  case NODE_BEGIN:
	    *body = node = node->nd_body;
	    if (newline && node) node->flags |= NODE_FL_NEWLINE;
	    continue;
	  case NODE_BLOCK:
	    body = &node->nd_end->nd_head;
	    break;
	  case NODE_IF:
	  case NODE_UNLESS:
	    if (subnodes(nd_body, nd_else)) break;
	    return;
	  case NODE_CASE:
	    body = &node->nd_body;
	    break;
	  case NODE_WHEN:
	    if (!subnodes(nd_body, nd_next)) goto end;
	    break;
	  case NODE_ENSURE:
	    if (!subnodes(nd_head, nd_resq)) goto end;
	    break;
	  case NODE_RESCUE:
	    if (node->nd_else) {
		body = &node->nd_resq;
		break;
	    }
	    if (!subnodes(nd_head, nd_resq)) goto end;
	    break;
	  default:
	    return;
	}
	node = *body;
	if (newline && node) node->flags |= NODE_FL_NEWLINE;
    }

#undef subnodes
}

static int
is_static_content(NODE *node)
{
    if (!node) return 1;
    switch (nd_type(node)) {
      case NODE_HASH:
	if (!(node = node->nd_head)) break;
      case NODE_LIST:
	do {
	    if (!is_static_content(node->nd_head)) return 0;
	} while ((node = node->nd_next) != 0);
      case NODE_LIT:
      case NODE_STR:
      case NODE_NIL:
      case NODE_TRUE:
      case NODE_FALSE:
      case NODE_ZLIST:
	break;
      default:
	return 0;
    }
    return 1;
}

static int
assign_in_cond(struct parser_params *p, NODE *node)
{
    switch (nd_type(node)) {
      case NODE_MASGN:
      case NODE_LASGN:
      case NODE_DASGN:
      case NODE_DASGN_CURR:
      case NODE_GASGN:
      case NODE_IASGN:
	break;

      default:
	return 0;
    }

    if (!node->nd_value) return 1;
    if (is_static_content(node->nd_value)) {
	/* reports always */
	parser_warn(p, node->nd_value, "found `= literal' in conditional, should be ==");
    }
    return 1;
}

enum cond_type {
    COND_IN_OP,
    COND_IN_COND,
    COND_IN_FF
};

#define SWITCH_BY_COND_TYPE(t, w, arg) \
    switch (t) { \
      case COND_IN_OP: break; \
      case COND_IN_COND: rb_##w##0(arg "literal in condition"); break; \
      case COND_IN_FF: rb_##w##0(arg "literal in flip-flop"); break; \
    }

static NODE *cond0(struct parser_params*,NODE*,enum cond_type,const YYLTYPE*);

static NODE*
range_op(struct parser_params *p, NODE *node, const YYLTYPE *loc)
{
    enum node_type type;

    if (node == 0) return 0;

    type = nd_type(node);
    value_expr(node);
    if (type == NODE_LIT && FIXNUM_P(node->nd_lit)) {
	if (!e_option_supplied(p)) parser_warn(p, node, "integer literal in flip-flop");
	return NEW_CALL(node, tEQ, NEW_LIST(NEW_GVAR(rb_intern("$."), loc), loc), loc);
    }
    return cond0(p, node, COND_IN_FF, loc);
}

static NODE*
cond0(struct parser_params *p, NODE *node, enum cond_type type, const YYLTYPE *loc)
{
    if (node == 0) return 0;
    if (!(node = nd_once_body(node))) return 0;
    assign_in_cond(p, node);

    switch (nd_type(node)) {
      case NODE_DSTR:
      case NODE_EVSTR:
      case NODE_STR:
	SWITCH_BY_COND_TYPE(type, warn, "string ")
	break;

      case NODE_DREGX:
	if (!e_option_supplied(p)) SWITCH_BY_COND_TYPE(type, warning, "regex ")

	return NEW_MATCH2(node, NEW_GVAR(idLASTLINE, loc), loc);

      case NODE_AND:
      case NODE_OR:
	node->nd_1st = cond0(p, node->nd_1st, COND_IN_COND, loc);
	node->nd_2nd = cond0(p, node->nd_2nd, COND_IN_COND, loc);
	break;

      case NODE_DOT2:
      case NODE_DOT3:
	node->nd_beg = range_op(p, node->nd_beg, loc);
	node->nd_end = range_op(p, node->nd_end, loc);
	if (nd_type(node) == NODE_DOT2) nd_set_type(node,NODE_FLIP2);
	else if (nd_type(node) == NODE_DOT3) nd_set_type(node, NODE_FLIP3);
	break;

      case NODE_DSYM:
	SWITCH_BY_COND_TYPE(type, warning, "string ")
	break;

      case NODE_LIT:
	if (RB_TYPE_P(node->nd_lit, T_REGEXP)) {
	    if (!e_option_supplied(p)) SWITCH_BY_COND_TYPE(type, warn, "regex ")
	    nd_set_type(node, NODE_MATCH);
	}
	else if (node->nd_lit == Qtrue ||
		 node->nd_lit == Qfalse) {
	    /* booleans are OK, e.g., while true */
	}
	else {
	    SWITCH_BY_COND_TYPE(type, warning, "")
	}
      default:
	break;
    }
    return node;
}

static NODE*
cond(struct parser_params *p, NODE *node, const YYLTYPE *loc)
{
    if (node == 0) return 0;
    return cond0(p, node, COND_IN_COND, loc);
}

static NODE*
method_cond(struct parser_params *p, NODE *node, const YYLTYPE *loc)
{
    if (node == 0) return 0;
    return cond0(p, node, COND_IN_OP, loc);
}

static NODE*
new_nil_at(struct parser_params *p, const rb_code_position_t *pos)
{
    YYLTYPE loc = {*pos, *pos};
    return NEW_NIL(&loc);
}

static NODE*
new_if(struct parser_params *p, NODE *cc, NODE *left, NODE *right, const YYLTYPE *loc)
{
    if (!cc) return right;
    cc = cond0(p, cc, COND_IN_COND, loc);
    return newline_node(NEW_IF(cc, left, right, loc));
}

static NODE*
new_unless(struct parser_params *p, NODE *cc, NODE *left, NODE *right, const YYLTYPE *loc)
{
    if (!cc) return right;
    cc = cond0(p, cc, COND_IN_COND, loc);
    return newline_node(NEW_UNLESS(cc, left, right, loc));
}

static NODE*
logop(struct parser_params *p, ID id, NODE *left, NODE *right,
	  const YYLTYPE *op_loc, const YYLTYPE *loc)
{
    enum node_type type = id == idAND || id == idANDOP ? NODE_AND : NODE_OR;
    NODE *op;
    value_expr(left);
    if (left && (enum node_type)nd_type(left) == type) {
	NODE *node = left, *second;
	while ((second = node->nd_2nd) != 0 && (enum node_type)nd_type(second) == type) {
	    node = second;
	}
	node->nd_2nd = NEW_NODE(type, second, right, 0, loc);
	nd_set_line(node->nd_2nd, op_loc->beg_pos.lineno);
	left->nd_loc.end_pos = loc->end_pos;
	return left;
    }
    op = NEW_NODE(type, left, right, 0, loc);
    nd_set_line(op, op_loc->beg_pos.lineno);
    return op;
}

static void
no_blockarg(struct parser_params *p, NODE *node)
{
    if (node && nd_type(node) == NODE_BLOCK_PASS) {
	compile_error(p, "block argument should not be given");
    }
}

static NODE *
ret_args(struct parser_params *p, NODE *node)
{
    if (node) {
	no_blockarg(p, node);
	if (nd_type(node) == NODE_LIST) {
	    if (node->nd_next == 0) {
		node = node->nd_head;
	    }
	    else {
		nd_set_type(node, NODE_VALUES);
	    }
	}
    }
    return node;
}

static NODE *
new_yield(struct parser_params *p, NODE *node, const YYLTYPE *loc)
{
    if (node) no_blockarg(p, node);

    return NEW_YIELD(node, loc);
}

static VALUE
negate_lit(struct parser_params *p, VALUE lit)
{
    if (FIXNUM_P(lit)) {
	return LONG2FIX(-FIX2LONG(lit));
    }
    if (SPECIAL_CONST_P(lit)) {
#if USE_FLONUM
	if (FLONUM_P(lit)) {
	    return DBL2NUM(-RFLOAT_VALUE(lit));
	}
#endif
	goto unknown;
    }
    switch (BUILTIN_TYPE(lit)) {
      case T_BIGNUM:
	BIGNUM_NEGATE(lit);
	lit = rb_big_norm(lit);
	break;
      case T_RATIONAL:
	RATIONAL_SET_NUM(lit, negate_lit(p, RRATIONAL(lit)->num));
	break;
      case T_COMPLEX:
	RCOMPLEX_SET_REAL(lit, negate_lit(p, RCOMPLEX(lit)->real));
	RCOMPLEX_SET_IMAG(lit, negate_lit(p, RCOMPLEX(lit)->imag));
	break;
      case T_FLOAT:
	RFLOAT(lit)->float_value = -RFLOAT_VALUE(lit);
	break;
      unknown:
      default:
	rb_parser_fatal(p, "unknown literal type (%s) passed to negate_lit",
			rb_builtin_class_name(lit));
	break;
    }
    return lit;
}

static NODE *
arg_blk_pass(NODE *node1, NODE *node2)
{
    if (node2) {
        if (!node1) return node2;
	node2->nd_head = node1;
	nd_set_first_lineno(node2, nd_first_lineno(node1));
	nd_set_first_column(node2, nd_first_column(node1));
	return node2;
    }
    return node1;
}

static bool
args_info_empty_p(struct rb_args_info *args)
{
    if (args->pre_args_num) return false;
    if (args->post_args_num) return false;
    if (args->rest_arg) return false;
    if (args->opt_args) return false;
    if (args->block_arg) return false;
    if (args->kw_args) return false;
    if (args->kw_rest_arg) return false;
    return true;
}

static NODE*
new_args(struct parser_params *p, NODE *pre_args, NODE *opt_args, ID rest_arg, NODE *post_args, NODE *tail, const YYLTYPE *loc)
{
    int saved_line = p->ruby_sourceline;
    struct rb_args_info *args = tail->nd_ainfo;

    args->pre_args_num   = pre_args ? rb_long2int(pre_args->nd_plen) : 0;
    args->pre_init       = pre_args ? pre_args->nd_next : 0;

    args->post_args_num  = post_args ? rb_long2int(post_args->nd_plen) : 0;
    args->post_init      = post_args ? post_args->nd_next : 0;
    args->first_post_arg = post_args ? post_args->nd_pid : 0;

    args->rest_arg       = rest_arg;

    args->opt_args       = opt_args;

    args->ruby2_keywords = rest_arg == idFWD_REST;

    p->ruby_sourceline = saved_line;
    nd_set_loc(tail, loc);

    return tail;
}

static NODE*
new_args_tail(struct parser_params *p, NODE *kw_args, ID kw_rest_arg, ID block, const YYLTYPE *kw_rest_loc)
{
    int saved_line = p->ruby_sourceline;
    NODE *node;
    VALUE tmpbuf = rb_imemo_tmpbuf_auto_free_pointer();
    struct rb_args_info *args = ZALLOC(struct rb_args_info);
    rb_imemo_tmpbuf_set_ptr(tmpbuf, args);
    args->imemo = tmpbuf;
    node = NEW_NODE(NODE_ARGS, 0, 0, args, &NULL_LOC);
    RB_OBJ_WRITTEN(p->ast, Qnil, tmpbuf);
    if (p->error_p) return node;

    args->block_arg      = block;
    args->kw_args        = kw_args;

    if (kw_args) {
	/*
	 * def foo(k1: 1, kr1:, k2: 2, **krest, &b)
	 * variable order: k1, kr1, k2, &b, internal_id, krest
	 * #=> <reorder>
	 * variable order: kr1, k1, k2, internal_id, krest, &b
	 */
	ID kw_bits = internal_id(p), *required_kw_vars, *kw_vars;
	struct vtable *vtargs = p->lvtbl->args;
	NODE *kwn = kw_args;

	vtable_pop(vtargs, !!block + !!kw_rest_arg);
	required_kw_vars = kw_vars = &vtargs->tbl[vtargs->pos];
	while (kwn) {
	    if (!NODE_REQUIRED_KEYWORD_P(kwn->nd_body))
		--kw_vars;
	    --required_kw_vars;
	    kwn = kwn->nd_next;
	}

	for (kwn = kw_args; kwn; kwn = kwn->nd_next) {
	    ID vid = kwn->nd_body->nd_vid;
	    if (NODE_REQUIRED_KEYWORD_P(kwn->nd_body)) {
		*required_kw_vars++ = vid;
	    }
	    else {
		*kw_vars++ = vid;
	    }
	}

	arg_var(p, kw_bits);
	if (kw_rest_arg) arg_var(p, kw_rest_arg);
	if (block) arg_var(p, block);

	args->kw_rest_arg = NEW_DVAR(kw_rest_arg, kw_rest_loc);
	args->kw_rest_arg->nd_cflag = kw_bits;
    }
    else if (kw_rest_arg == idNil) {
	args->no_kwarg = 1;
    }
    else if (kw_rest_arg) {
	args->kw_rest_arg = NEW_DVAR(kw_rest_arg, kw_rest_loc);
    }

    p->ruby_sourceline = saved_line;
    return node;
}

static NODE *
args_with_numbered(struct parser_params *p, NODE *args, int max_numparam)
{
    if (max_numparam > NO_PARAM) {
	if (!args) {
	    YYLTYPE loc = RUBY_INIT_YYLLOC();
	    args = new_args_tail(p, 0, 0, 0, 0);
	    nd_set_loc(args, &loc);
	}
	args->nd_ainfo->pre_args_num = max_numparam;
    }
    return args;
}

static NODE*
new_array_pattern(struct parser_params *p, NODE *constant, NODE *pre_arg, NODE *aryptn, const YYLTYPE *loc)
{
    struct rb_ary_pattern_info *apinfo = aryptn->nd_apinfo;

    aryptn->nd_pconst = constant;

    if (pre_arg) {
	NODE *pre_args = NEW_LIST(pre_arg, loc);
	if (apinfo->pre_args) {
	    apinfo->pre_args = list_concat(pre_args, apinfo->pre_args);
	}
	else {
	    apinfo->pre_args = pre_args;
	}
    }
    return aryptn;
}

static NODE*
new_array_pattern_tail(struct parser_params *p, NODE *pre_args, int has_rest, ID rest_arg, NODE *post_args, const YYLTYPE *loc)
{
    int saved_line = p->ruby_sourceline;
    NODE *node;
    VALUE tmpbuf = rb_imemo_tmpbuf_auto_free_pointer();
    struct rb_ary_pattern_info *apinfo = ZALLOC(struct rb_ary_pattern_info);
    rb_imemo_tmpbuf_set_ptr(tmpbuf, apinfo);
    node = NEW_NODE(NODE_ARYPTN, 0, tmpbuf, apinfo, loc);
    RB_OBJ_WRITTEN(p->ast, Qnil, tmpbuf);

    apinfo->pre_args = pre_args;

    if (has_rest) {
	if (rest_arg) {
	    apinfo->rest_arg = assignable(p, rest_arg, 0, loc);
	}
	else {
	    apinfo->rest_arg = NODE_SPECIAL_NO_NAME_REST;
	}
    }
    else {
	apinfo->rest_arg = NULL;
    }

    apinfo->post_args = post_args;

    p->ruby_sourceline = saved_line;
    return node;
}

static NODE*
new_find_pattern(struct parser_params *p, NODE *constant, NODE *fndptn, const YYLTYPE *loc)
{
    fndptn->nd_pconst = constant;

    return fndptn;
}

static NODE*
new_find_pattern_tail(struct parser_params *p, ID pre_rest_arg, NODE *args, ID post_rest_arg, const YYLTYPE *loc)
{
    int saved_line = p->ruby_sourceline;
    NODE *node;
    VALUE tmpbuf = rb_imemo_tmpbuf_auto_free_pointer();
    struct rb_fnd_pattern_info *fpinfo = ZALLOC(struct rb_fnd_pattern_info);
    rb_imemo_tmpbuf_set_ptr(tmpbuf, fpinfo);
    node = NEW_NODE(NODE_FNDPTN, 0, tmpbuf, fpinfo, loc);
    RB_OBJ_WRITTEN(p->ast, Qnil, tmpbuf);

    fpinfo->pre_rest_arg = pre_rest_arg ? assignable(p, pre_rest_arg, 0, loc) : NODE_SPECIAL_NO_NAME_REST;
    fpinfo->args = args;
    fpinfo->post_rest_arg = post_rest_arg ? assignable(p, post_rest_arg, 0, loc) : NODE_SPECIAL_NO_NAME_REST;

    p->ruby_sourceline = saved_line;
    return node;
}

static NODE*
new_hash_pattern(struct parser_params *p, NODE *constant, NODE *hshptn, const YYLTYPE *loc)
{
    hshptn->nd_pconst = constant;
    return hshptn;
}

static NODE*
new_hash_pattern_tail(struct parser_params *p, NODE *kw_args, ID kw_rest_arg, const YYLTYPE *loc)
{
    int saved_line = p->ruby_sourceline;
    NODE *node, *kw_rest_arg_node;

    if (kw_rest_arg == idNil) {
	kw_rest_arg_node = NODE_SPECIAL_NO_REST_KEYWORD;
    }
    else if (kw_rest_arg) {
	kw_rest_arg_node = assignable(p, kw_rest_arg, 0, loc);
    }
    else {
	kw_rest_arg_node = NULL;
    }

    node = NEW_NODE(NODE_HSHPTN, 0, kw_args, kw_rest_arg_node, loc);

    p->ruby_sourceline = saved_line;
    return node;
}

static void
warn_one_line_pattern_matching(struct parser_params *p, NODE *node, NODE *pattern, bool right_assign)
{
    enum node_type type;
    type = nd_type(pattern);

    if (rb_warning_category_enabled_p(RB_WARN_CATEGORY_EXPERIMENTAL) &&
	!(right_assign && (type == NODE_LASGN || type == NODE_DASGN || type == NODE_DASGN_CURR)))
	rb_warn0L(nd_line(node), "One-line pattern matching is experimental, and the behavior may change in future versions of Ruby!");
}

static NODE*
dsym_node(struct parser_params *p, NODE *node, const YYLTYPE *loc)
{
    VALUE lit;

    if (!node) {
	return NEW_LIT(ID2SYM(idNULL), loc);
    }

    switch (nd_type(node)) {
      case NODE_DSTR:
	nd_set_type(node, NODE_DSYM);
	nd_set_loc(node, loc);
	break;
      case NODE_STR:
	lit = node->nd_lit;
	RB_OBJ_WRITTEN(p->ast, Qnil, node->nd_lit = ID2SYM(rb_intern_str(lit)));
	nd_set_type(node, NODE_LIT);
	nd_set_loc(node, loc);
	break;
      default:
	node = NEW_NODE(NODE_DSYM, Qnil, 1, NEW_LIST(node, loc), loc);
	break;
    }
    return node;
}

static int
append_literal_keys(st_data_t k, st_data_t v, st_data_t h)
{
    NODE *node = (NODE *)v;
    NODE **result = (NODE **)h;
    node->nd_alen = 2;
    node->nd_next->nd_end = node->nd_next;
    node->nd_next->nd_next = 0;
    if (*result)
	list_concat(*result, node);
    else
	*result = node;
    return ST_CONTINUE;
}

static NODE *
remove_duplicate_keys(struct parser_params *p, NODE *hash)
{
    st_table *literal_keys = st_init_numtable_with_size(hash->nd_alen / 2);
    NODE *result = 0;
    rb_code_location_t loc = hash->nd_loc;
    while (hash && hash->nd_head && hash->nd_next) {
	NODE *head = hash->nd_head;
	NODE *value = hash->nd_next;
	NODE *next = value->nd_next;
	VALUE key = (VALUE)head;
	st_data_t data;
	if (nd_type(head) == NODE_LIT &&
	    st_lookup(literal_keys, (key = head->nd_lit), &data)) {
	    rb_compile_warn(p->ruby_sourcefile, nd_line((NODE *)data),
			    "key %+"PRIsVALUE" is duplicated and overwritten on line %d",
			    head->nd_lit, nd_line(head));
	    head = ((NODE *)data)->nd_next;
	    head->nd_head = block_append(p, head->nd_head, value->nd_head);
	}
	else {
	    st_insert(literal_keys, (st_data_t)key, (st_data_t)hash);
	}
	hash = next;
    }
    st_foreach(literal_keys, append_literal_keys, (st_data_t)&result);
    st_free_table(literal_keys);
    if (hash) {
	if (!result) result = hash;
	else list_concat(result, hash);
    }
    result->nd_loc = loc;
    return result;
}

static NODE *
new_hash(struct parser_params *p, NODE *hash, const YYLTYPE *loc)
{
    if (hash) hash = remove_duplicate_keys(p, hash);
    return NEW_HASH(hash, loc);
}
#endif

static void
error_duplicate_pattern_variable(struct parser_params *p, ID id, const YYLTYPE *loc)
{
    if (is_private_local_id(id)) {
	return;
    }
    if (st_is_member(p->pvtbl, id)) {
	yyerror1(loc, "duplicated variable name");
    }
    else {
	st_insert(p->pvtbl, (st_data_t)id, 0);
    }
}

static void
error_duplicate_pattern_key(struct parser_params *p, VALUE key, const YYLTYPE *loc)
{
    if (!p->pktbl) {
	p->pktbl = st_init_numtable();
    }
    else if (st_is_member(p->pktbl, key)) {
	yyerror1(loc, "duplicated key name");
	return;
    }
    st_insert(p->pktbl, (st_data_t)key, 0);
}

#ifndef RIPPER
static NODE *
new_unique_key_hash(struct parser_params *p, NODE *hash, const YYLTYPE *loc)
{
    return NEW_HASH(hash, loc);
}
#endif /* !RIPPER */

#ifndef RIPPER
static NODE *
new_op_assign(struct parser_params *p, NODE *lhs, ID op, NODE *rhs, struct lex_context ctxt, const YYLTYPE *loc)
{
    NODE *asgn;

    if (lhs) {
	ID vid = lhs->nd_vid;
	YYLTYPE lhs_loc = lhs->nd_loc;
	int shareable = ctxt.shareable_constant_value;
	if (shareable) {
	    switch (nd_type(lhs)) {
	      case NODE_CDECL:
	      case NODE_COLON2:
	      case NODE_COLON3:
		break;
	      default:
		shareable = 0;
		break;
	    }
	}
	if (op == tOROP) {
	    rhs = shareable_constant_value(p, rhs, shareable, &rhs->nd_loc);
	    lhs->nd_value = rhs;
	    nd_set_loc(lhs, loc);
	    asgn = NEW_OP_ASGN_OR(gettable(p, vid, &lhs_loc), lhs, loc);
	    if (is_notop_id(vid)) {
		switch (id_type(vid)) {
		  case ID_GLOBAL:
		  case ID_INSTANCE:
		  case ID_CLASS:
		    asgn->nd_aid = vid;
		}
	    }
	}
	else if (op == tANDOP) {
	    if (shareable) {
		rhs = shareable_constant_value(p, rhs, shareable, &rhs->nd_loc);
	    }
	    lhs->nd_value = rhs;
	    nd_set_loc(lhs, loc);
	    asgn = NEW_OP_ASGN_AND(gettable(p, vid, &lhs_loc), lhs, loc);
	}
	else {
	    asgn = lhs;
	    rhs = NEW_CALL(gettable(p, vid, &lhs_loc), op, NEW_LIST(rhs, &rhs->nd_loc), loc);
	    if (shareable) {
		rhs = shareable_constant_value(p, rhs, shareable, &rhs->nd_loc);
	    }
	    asgn->nd_value = rhs;
	    nd_set_loc(asgn, loc);
	}
    }
    else {
	asgn = NEW_BEGIN(0, loc);
    }
    return asgn;
}

static NODE *
new_ary_op_assign(struct parser_params *p, NODE *ary,
		  NODE *args, ID op, NODE *rhs, const YYLTYPE *args_loc, const YYLTYPE *loc)
{
    NODE *asgn;

    args = make_list(args, args_loc);
    if (nd_type(args) == NODE_BLOCK_PASS) {
	args = NEW_ARGSCAT(args, rhs, loc);
    }
    else {
	args = arg_concat(p, args, rhs, loc);
    }
    asgn = NEW_OP_ASGN1(ary, op, args, loc);
    fixpos(asgn, ary);
    return asgn;
}

static NODE *
new_attr_op_assign(struct parser_params *p, NODE *lhs,
		   ID atype, ID attr, ID op, NODE *rhs, const YYLTYPE *loc)
{
    NODE *asgn;

    asgn = NEW_OP_ASGN2(lhs, CALL_Q_P(atype), attr, op, rhs, loc);
    fixpos(asgn, lhs);
    return asgn;
}

static NODE *
new_const_op_assign(struct parser_params *p, NODE *lhs, ID op, NODE *rhs, struct lex_context ctxt, const YYLTYPE *loc)
{
    NODE *asgn;

    if (lhs) {
	rhs = shareable_constant_value(p, rhs, ctxt.shareable_constant_value, loc);
	asgn = NEW_OP_CDECL(lhs, op, rhs, loc);
    }
    else {
	asgn = NEW_BEGIN(0, loc);
    }
    fixpos(asgn, lhs);
    return asgn;
}

static NODE *
const_decl(struct parser_params *p, NODE *path, const YYLTYPE *loc)
{
    if (p->ctxt.in_def) {
	yyerror1(loc, "dynamic constant assignment");
    }
    return NEW_CDECL(0, 0, (path), loc);
}
#else
static VALUE
const_decl(struct parser_params *p, VALUE path)
{
    if (p->ctxt.in_def) {
	path = assign_error(p, "dynamic constant assignment", path);
    }
    return path;
}

static VALUE
assign_error(struct parser_params *p, const char *mesg, VALUE a)
{
    a = dispatch2(assign_error, ERR_MESG(), a);
    ripper_error(p);
    return a;
}

static VALUE
var_field(struct parser_params *p, VALUE a)
{
    return ripper_new_yylval(p, get_id(a), dispatch1(var_field, a), 0);
}
#endif

#ifndef RIPPER
static NODE *
new_bodystmt(struct parser_params *p, NODE *head, NODE *rescue, NODE *rescue_else, NODE *ensure, const YYLTYPE *loc)
{
    NODE *result = head;
    if (rescue) {
        NODE *tmp = rescue_else ? rescue_else : rescue;
        YYLTYPE rescue_loc = code_loc_gen(&head->nd_loc, &tmp->nd_loc);

        result = NEW_RESCUE(head, rescue, rescue_else, &rescue_loc);
        nd_set_line(result, rescue->nd_loc.beg_pos.lineno);
    }
    else if (rescue_else) {
        result = block_append(p, result, rescue_else);
    }
    if (ensure) {
        result = NEW_ENSURE(result, ensure, loc);
    }
    fixpos(result, head);
    return result;
}
#endif

static void
warn_unused_var(struct parser_params *p, struct local_vars *local)
{
    int cnt;

    if (!local->used) return;
    cnt = local->used->pos;
    if (cnt != local->vars->pos) {
	rb_parser_fatal(p, "local->used->pos != local->vars->pos");
    }
#ifndef RIPPER
    ID *v = local->vars->tbl;
    ID *u = local->used->tbl;
    for (int i = 0; i < cnt; ++i) {
	if (!v[i] || (u[i] & LVAR_USED)) continue;
	if (is_private_local_id(v[i])) continue;
	rb_warn1L((int)u[i], "assigned but unused variable - %"PRIsWARN, rb_id2str(v[i]));
    }
#endif
}

static void
local_push(struct parser_params *p, int toplevel_scope)
{
    struct local_vars *local;
    int inherits_dvars = toplevel_scope && compile_for_eval;
    int warn_unused_vars = RTEST(ruby_verbose);

    local = ALLOC(struct local_vars);
    local->prev = p->lvtbl;
    local->args = vtable_alloc(0);
    local->vars = vtable_alloc(inherits_dvars ? DVARS_INHERIT : DVARS_TOPSCOPE);
#ifndef RIPPER
    if (toplevel_scope && compile_for_eval) warn_unused_vars = 0;
    if (toplevel_scope && e_option_supplied(p)) warn_unused_vars = 0;
    local->numparam.outer = 0;
    local->numparam.inner = 0;
    local->numparam.current = 0;
#endif
    local->used = warn_unused_vars ? vtable_alloc(0) : 0;

# if WARN_PAST_SCOPE
    local->past = 0;
# endif
    CMDARG_PUSH(0);
    COND_PUSH(0);
    p->lvtbl = local;
}

static void
local_pop(struct parser_params *p)
{
    struct local_vars *local = p->lvtbl->prev;
    if (p->lvtbl->used) {
	warn_unused_var(p, p->lvtbl);
	vtable_free(p->lvtbl->used);
    }
# if WARN_PAST_SCOPE
    while (p->lvtbl->past) {
	struct vtable *past = p->lvtbl->past;
	p->lvtbl->past = past->prev;
	vtable_free(past);
    }
# endif
    vtable_free(p->lvtbl->args);
    vtable_free(p->lvtbl->vars);
    CMDARG_POP();
    COND_POP();
    ruby_sized_xfree(p->lvtbl, sizeof(*p->lvtbl));
    p->lvtbl = local;
}

#ifndef RIPPER
static ID*
local_tbl(struct parser_params *p)
{
    int cnt_args = vtable_size(p->lvtbl->args);
    int cnt_vars = vtable_size(p->lvtbl->vars);
    int cnt = cnt_args + cnt_vars;
    int i, j;
    ID *buf;

    if (cnt <= 0) return 0;
    buf = ALLOC_N(ID, cnt + 2);
    MEMCPY(buf+1, p->lvtbl->args->tbl, ID, cnt_args);
    /* remove IDs duplicated to warn shadowing */
    for (i = 0, j = cnt_args+1; i < cnt_vars; ++i) {
	ID id = p->lvtbl->vars->tbl[i];
	if (!vtable_included(p->lvtbl->args, id)) {
	    buf[j++] = id;
	}
    }
    if (--j < cnt) {
	REALLOC_N(buf, ID, (cnt = j) + 2);
    }
    buf[0] = cnt;
    rb_ast_add_local_table(p->ast, buf);

    return buf;
}

static NODE*
node_newnode_with_locals(struct parser_params *p, enum node_type type, VALUE a1, VALUE a2, const rb_code_location_t *loc)
{
    ID *a0;
    NODE *n;

    a0 = local_tbl(p);
    n = NEW_NODE(type, a0, a1, a2, loc);
    return n;
}

#endif

static void
numparam_name(struct parser_params *p, ID id)
{
    if (!NUMPARAM_ID_P(id)) return;
    compile_error(p, "_%d is reserved for numbered parameter",
        NUMPARAM_ID_TO_IDX(id));
}

static void
arg_var(struct parser_params *p, ID id)
{
    numparam_name(p, id);
    vtable_add(p->lvtbl->args, id);
}

static void
local_var(struct parser_params *p, ID id)
{
    numparam_name(p, id);
    vtable_add(p->lvtbl->vars, id);
    if (p->lvtbl->used) {
	vtable_add(p->lvtbl->used, (ID)p->ruby_sourceline);
    }
}

static int
local_id_ref(struct parser_params *p, ID id, ID **vidrefp)
{
    struct vtable *vars, *args, *used;

    vars = p->lvtbl->vars;
    args = p->lvtbl->args;
    used = p->lvtbl->used;

    while (vars && !DVARS_TERMINAL_P(vars->prev)) {
	vars = vars->prev;
	args = args->prev;
	if (used) used = used->prev;
    }

    if (vars && vars->prev == DVARS_INHERIT) {
	return rb_local_defined(id, p->parent_iseq);
    }
    else if (vtable_included(args, id)) {
	return 1;
    }
    else {
	int i = vtable_included(vars, id);
	if (i && used && vidrefp) *vidrefp = &used->tbl[i-1];
	return i != 0;
    }
}

static int
local_id(struct parser_params *p, ID id)
{
    return local_id_ref(p, id, NULL);
}

static int
check_forwarding_args(struct parser_params *p)
{
    if (local_id(p, idFWD_REST) &&
#if idFWD_KWREST
        local_id(p, idFWD_KWREST) &&
#endif
        local_id(p, idFWD_BLOCK)) return TRUE;
    compile_error(p, "unexpected ...");
    return FALSE;
}

static void
add_forwarding_args(struct parser_params *p)
{
    arg_var(p, idFWD_REST);
#if idFWD_KWREST
    arg_var(p, idFWD_KWREST);
#endif
    arg_var(p, idFWD_BLOCK);
}

#ifndef RIPPER
static NODE *
new_args_forward_call(struct parser_params *p, NODE *leading, const YYLTYPE *loc, const YYLTYPE *argsloc)
{
    NODE *splat = NEW_SPLAT(NEW_LVAR(idFWD_REST, loc), loc);
#if idFWD_KWREST
    NODE *kwrest = list_append(p, NEW_LIST(0, loc), NEW_LVAR(idFWD_KWREST, loc));
#endif
    NODE *block = NEW_BLOCK_PASS(NEW_LVAR(idFWD_BLOCK, loc), loc);
    NODE *args = leading ? rest_arg_append(p, leading, splat, argsloc) : splat;
#if idFWD_KWREST
    args = arg_append(p, splat, new_hash(p, kwrest, loc), loc);
#endif
    return arg_blk_pass(args, block);
}

static NODE *
new_args_forward_def(struct parser_params *p, NODE *leading, const YYLTYPE *loc)
{
    NODE *n = new_args_tail(p, Qnone, idFWD_KWREST, idFWD_BLOCK, loc);
    return new_args(p, leading, Qnone, idFWD_REST, Qnone, n, loc);
}
#endif

static NODE *
numparam_push(struct parser_params *p)
{
#ifndef RIPPER
    struct local_vars *local = p->lvtbl;
    NODE *inner = local->numparam.inner;
    if (!local->numparam.outer) {
	local->numparam.outer = local->numparam.current;
    }
    local->numparam.inner = 0;
    local->numparam.current = 0;
    return inner;
#else
    return 0;
#endif
}

static void
numparam_pop(struct parser_params *p, NODE *prev_inner)
{
#ifndef RIPPER
    struct local_vars *local = p->lvtbl;
    if (prev_inner) {
	/* prefer first one */
	local->numparam.inner = prev_inner;
    }
    else if (local->numparam.current) {
	/* current and inner are exclusive */
	local->numparam.inner = local->numparam.current;
    }
    if (p->max_numparam > NO_PARAM) {
	/* current and outer are exclusive */
	local->numparam.current = local->numparam.outer;
	local->numparam.outer = 0;
    }
    else {
	/* no numbered parameter */
	local->numparam.current = 0;
    }
#endif
}

static const struct vtable *
dyna_push(struct parser_params *p)
{
    p->lvtbl->args = vtable_alloc(p->lvtbl->args);
    p->lvtbl->vars = vtable_alloc(p->lvtbl->vars);
    if (p->lvtbl->used) {
	p->lvtbl->used = vtable_alloc(p->lvtbl->used);
    }
    return p->lvtbl->args;
}

static void
dyna_pop_vtable(struct parser_params *p, struct vtable **vtblp)
{
    struct vtable *tmp = *vtblp;
    *vtblp = tmp->prev;
# if WARN_PAST_SCOPE
    if (p->past_scope_enabled) {
	tmp->prev = p->lvtbl->past;
	p->lvtbl->past = tmp;
	return;
    }
# endif
    vtable_free(tmp);
}

static void
dyna_pop_1(struct parser_params *p)
{
    struct vtable *tmp;

    if ((tmp = p->lvtbl->used) != 0) {
	warn_unused_var(p, p->lvtbl);
	p->lvtbl->used = p->lvtbl->used->prev;
	vtable_free(tmp);
    }
    dyna_pop_vtable(p, &p->lvtbl->args);
    dyna_pop_vtable(p, &p->lvtbl->vars);
}

static void
dyna_pop(struct parser_params *p, const struct vtable *lvargs)
{
    while (p->lvtbl->args != lvargs) {
	dyna_pop_1(p);
	if (!p->lvtbl->args) {
	    struct local_vars *local = p->lvtbl->prev;
	    ruby_sized_xfree(p->lvtbl, sizeof(*p->lvtbl));
	    p->lvtbl = local;
	}
    }
    dyna_pop_1(p);
}

static int
dyna_in_block(struct parser_params *p)
{
    return !DVARS_TERMINAL_P(p->lvtbl->vars) && p->lvtbl->vars->prev != DVARS_TOPSCOPE;
}

static int
dvar_defined_ref(struct parser_params *p, ID id, ID **vidrefp)
{
    struct vtable *vars, *args, *used;
    int i;

    args = p->lvtbl->args;
    vars = p->lvtbl->vars;
    used = p->lvtbl->used;

    while (!DVARS_TERMINAL_P(vars)) {
	if (vtable_included(args, id)) {
	    return 1;
	}
	if ((i = vtable_included(vars, id)) != 0) {
	    if (used && vidrefp) *vidrefp = &used->tbl[i-1];
	    return 1;
	}
	args = args->prev;
	vars = vars->prev;
	if (!vidrefp) used = 0;
	if (used) used = used->prev;
    }

    if (vars == DVARS_INHERIT && !NUMPARAM_ID_P(id)) {
        return rb_dvar_defined(id, p->parent_iseq);
    }

    return 0;
}

static int
dvar_defined(struct parser_params *p, ID id)
{
    return dvar_defined_ref(p, id, NULL);
}

static int
dvar_curr(struct parser_params *p, ID id)
{
    return (vtable_included(p->lvtbl->args, id) ||
	    vtable_included(p->lvtbl->vars, id));
}

static void
reg_fragment_enc_error(struct parser_params* p, VALUE str, int c)
{
    compile_error(p,
        "regexp encoding option '%c' differs from source encoding '%s'",
        c, rb_enc_name(rb_enc_get(str)));
}

#ifndef RIPPER
int
rb_reg_fragment_setenc(struct parser_params* p, VALUE str, int options)
{
    int c = RE_OPTION_ENCODING_IDX(options);

    if (c) {
	int opt, idx;
	rb_char_to_option_kcode(c, &opt, &idx);
	if (idx != ENCODING_GET(str) &&
	    rb_enc_str_coderange(str) != ENC_CODERANGE_7BIT) {
            goto error;
	}
	ENCODING_SET(str, idx);
    }
    else if (RE_OPTION_ENCODING_NONE(options)) {
        if (!ENCODING_IS_ASCII8BIT(str) &&
            rb_enc_str_coderange(str) != ENC_CODERANGE_7BIT) {
            c = 'n';
            goto error;
        }
	rb_enc_associate(str, rb_ascii8bit_encoding());
    }
    else if (p->enc == rb_usascii_encoding()) {
	if (rb_enc_str_coderange(str) != ENC_CODERANGE_7BIT) {
	    /* raise in re.c */
	    rb_enc_associate(str, rb_usascii_encoding());
	}
	else {
	    rb_enc_associate(str, rb_ascii8bit_encoding());
	}
    }
    return 0;

  error:
    return c;
}

static void
reg_fragment_setenc(struct parser_params* p, VALUE str, int options)
{
    int c = rb_reg_fragment_setenc(p, str, options);
    if (c) reg_fragment_enc_error(p, str, c);
}

static int
reg_fragment_check(struct parser_params* p, VALUE str, int options)
{
    VALUE err;
    reg_fragment_setenc(p, str, options);
    err = rb_reg_check_preprocess(str);
    if (err != Qnil) {
        err = rb_obj_as_string(err);
        compile_error(p, "%"PRIsVALUE, err);
	return 0;
    }
    return 1;
}

typedef struct {
    struct parser_params* parser;
    rb_encoding *enc;
    NODE *succ_block;
    const YYLTYPE *loc;
} reg_named_capture_assign_t;

static int
reg_named_capture_assign_iter(const OnigUChar *name, const OnigUChar *name_end,
          int back_num, int *back_refs, OnigRegex regex, void *arg0)
{
    reg_named_capture_assign_t *arg = (reg_named_capture_assign_t*)arg0;
    struct parser_params* p = arg->parser;
    rb_encoding *enc = arg->enc;
    long len = name_end - name;
    const char *s = (const char *)name;
    ID var;
    NODE *node, *succ;

    if (!len) return ST_CONTINUE;
    if (len < MAX_WORD_LENGTH && rb_reserved_word(s, (int)len))
        return ST_CONTINUE;
    if (rb_enc_symname_type(s, len, enc, (1U<<ID_LOCAL)) != ID_LOCAL)
        return ST_CONTINUE;

    var = intern_cstr(s, len, enc);
    node = node_assign(p, assignable(p, var, 0, arg->loc), NEW_LIT(ID2SYM(var), arg->loc), NO_LEX_CTXT, arg->loc);
    succ = arg->succ_block;
    if (!succ) succ = NEW_BEGIN(0, arg->loc);
    succ = block_append(p, succ, node);
    arg->succ_block = succ;
    return ST_CONTINUE;
}

static NODE *
reg_named_capture_assign(struct parser_params* p, VALUE regexp, const YYLTYPE *loc)
{
    reg_named_capture_assign_t arg;

    arg.parser = p;
    arg.enc = rb_enc_get(regexp);
    arg.succ_block = 0;
    arg.loc = loc;
    onig_foreach_name(RREGEXP_PTR(regexp), reg_named_capture_assign_iter, &arg);

    if (!arg.succ_block) return 0;
    return arg.succ_block->nd_next;
}

static VALUE
parser_reg_compile(struct parser_params* p, VALUE str, int options)
{
    reg_fragment_setenc(p, str, options);
    return rb_parser_reg_compile(p, str, options);
}

VALUE
rb_parser_reg_compile(struct parser_params* p, VALUE str, int options)
{
    return rb_reg_compile(str, options & RE_OPTION_MASK, p->ruby_sourcefile, p->ruby_sourceline);
}

static VALUE
reg_compile(struct parser_params* p, VALUE str, int options)
{
    VALUE re;
    VALUE err;

    err = rb_errinfo();
    re = parser_reg_compile(p, str, options);
    if (NIL_P(re)) {
	VALUE m = rb_attr_get(rb_errinfo(), idMesg);
	rb_set_errinfo(err);
	compile_error(p, "%"PRIsVALUE, m);
	return Qnil;
    }
    return re;
}
#else
static VALUE
parser_reg_compile(struct parser_params* p, VALUE str, int options, VALUE *errmsg)
{
    VALUE err = rb_errinfo();
    VALUE re;
    str = ripper_is_node_yylval(str) ? RNODE(str)->nd_cval : str;
    int c = rb_reg_fragment_setenc(p, str, options);
    if (c) reg_fragment_enc_error(p, str, c);
    re = rb_parser_reg_compile(p, str, options);
    if (NIL_P(re)) {
	*errmsg = rb_attr_get(rb_errinfo(), idMesg);
	rb_set_errinfo(err);
    }
    return re;
}
#endif

#ifndef RIPPER
void
rb_parser_set_options(VALUE vparser, int print, int loop, int chomp, int split)
{
    struct parser_params *p;
    TypedData_Get_Struct(vparser, struct parser_params, &parser_data_type, p);
    p->do_print = print;
    p->do_loop = loop;
    p->do_chomp = chomp;
    p->do_split = split;
}

static NODE *
parser_append_options(struct parser_params *p, NODE *node)
{
    static const YYLTYPE default_location = {{1, 0}, {1, 0}};
    const YYLTYPE *const LOC = &default_location;

    if (p->do_print) {
	NODE *print = NEW_FCALL(rb_intern("print"),
				NEW_LIST(NEW_GVAR(idLASTLINE, LOC), LOC),
				LOC);
	node = block_append(p, node, print);
    }

    if (p->do_loop) {
	if (p->do_split) {
	    NODE *args = NEW_LIST(NEW_GVAR(rb_intern("$;"), LOC), LOC);
	    NODE *split = NEW_GASGN(rb_intern("$F"),
				    NEW_CALL(NEW_GVAR(idLASTLINE, LOC),
					     rb_intern("split"), args, LOC),
				    LOC);
	    node = block_append(p, split, node);
	}
	if (p->do_chomp) {
	    NODE *chomp = NEW_CALL(NEW_GVAR(idLASTLINE, LOC),
				   rb_intern("chomp!"), 0, LOC);
	    node = block_append(p, chomp, node);
	}

	node = NEW_WHILE(NEW_VCALL(idGets, LOC), node, 1, LOC);
    }

    return node;
}

void
rb_init_parse(void)
{
    /* just to suppress unused-function warnings */
    (void)nodetype;
    (void)nodeline;
}

static ID
internal_id(struct parser_params *p)
{
    const ID max_id = RB_ID_SERIAL_MAX & ~0xffff;
    ID id = (ID)vtable_size(p->lvtbl->args) + (ID)vtable_size(p->lvtbl->vars);
    id = max_id - id;
    return ID_STATIC_SYM | ID_INTERNAL | (id << ID_SCOPE_SHIFT);
}
#endif /* !RIPPER */

static void
parser_initialize(struct parser_params *p)
{
    /* note: we rely on TypedData_Make_Struct to set most fields to 0 */
    p->command_start = TRUE;
    p->ruby_sourcefile_string = Qnil;
    p->lex.lpar_beg = -1; /* make lambda_beginning_p() == FALSE at first */
    p->node_id = 0;
#ifdef RIPPER
    p->delayed.token = Qnil;
    p->result = Qnil;
    p->parsing_thread = Qnil;
#else
    p->error_buffer = Qfalse;
#endif
    p->debug_buffer = Qnil;
    p->debug_output = rb_ractor_stdout();
    p->enc = rb_utf8_encoding();
}

#ifdef RIPPER
#define parser_mark ripper_parser_mark
#define parser_free ripper_parser_free
#endif

static void
parser_mark(void *ptr)
{
    struct parser_params *p = (struct parser_params*)ptr;

    rb_gc_mark(p->lex.input);
    rb_gc_mark(p->lex.prevline);
    rb_gc_mark(p->lex.lastline);
    rb_gc_mark(p->lex.nextline);
    rb_gc_mark(p->ruby_sourcefile_string);
    rb_gc_mark((VALUE)p->lex.strterm);
    rb_gc_mark((VALUE)p->ast);
    rb_gc_mark(p->case_labels);
#ifndef RIPPER
    rb_gc_mark(p->debug_lines);
    rb_gc_mark(p->compile_option);
    rb_gc_mark(p->error_buffer);
#else
    rb_gc_mark(p->delayed.token);
    rb_gc_mark(p->value);
    rb_gc_mark(p->result);
    rb_gc_mark(p->parsing_thread);
#endif
    rb_gc_mark(p->debug_buffer);
    rb_gc_mark(p->debug_output);
#ifdef YYMALLOC
    rb_gc_mark((VALUE)p->heap);
#endif
}

static void
parser_free(void *ptr)
{
    struct parser_params *p = (struct parser_params*)ptr;
    struct local_vars *local, *prev;

    if (p->tokenbuf) {
        ruby_sized_xfree(p->tokenbuf, p->toksiz);
    }
    for (local = p->lvtbl; local; local = prev) {
	if (local->vars) xfree(local->vars);
	prev = local->prev;
	xfree(local);
    }
    {
	token_info *ptinfo;
	while ((ptinfo = p->token_info) != 0) {
	    p->token_info = ptinfo->next;
	    xfree(ptinfo);
	}
    }
    xfree(ptr);
}

static size_t
parser_memsize(const void *ptr)
{
    struct parser_params *p = (struct parser_params*)ptr;
    struct local_vars *local;
    size_t size = sizeof(*p);

    size += p->toksiz;
    for (local = p->lvtbl; local; local = local->prev) {
	size += sizeof(*local);
	if (local->vars) size += local->vars->capa * sizeof(ID);
    }
    return size;
}

static const rb_data_type_t parser_data_type = {
#ifndef RIPPER
    "parser",
#else
    "ripper",
#endif
    {
	parser_mark,
	parser_free,
	parser_memsize,
    },
    0, 0, RUBY_TYPED_FREE_IMMEDIATELY
};

#ifndef RIPPER
#undef rb_reserved_word

const struct kwtable *
rb_reserved_word(const char *str, unsigned int len)
{
    return reserved_word(str, len);
}

VALUE
rb_parser_new(void)
{
    struct parser_params *p;
    VALUE parser = TypedData_Make_Struct(0, struct parser_params,
					 &parser_data_type, p);
    parser_initialize(p);
    return parser;
}

VALUE
rb_parser_set_context(VALUE vparser, const struct rb_iseq_struct *base, int main)
{
    struct parser_params *p;

    TypedData_Get_Struct(vparser, struct parser_params, &parser_data_type, p);
    p->error_buffer = main ? Qfalse : Qnil;
    p->parent_iseq = base;
    return vparser;
}
#endif

#ifdef RIPPER
#define rb_parser_end_seen_p ripper_parser_end_seen_p
#define rb_parser_encoding ripper_parser_encoding
#define rb_parser_get_yydebug ripper_parser_get_yydebug
#define rb_parser_set_yydebug ripper_parser_set_yydebug
#define rb_parser_get_debug_output ripper_parser_get_debug_output
#define rb_parser_set_debug_output ripper_parser_set_debug_output
static VALUE ripper_parser_end_seen_p(VALUE vparser);
static VALUE ripper_parser_encoding(VALUE vparser);
static VALUE ripper_parser_get_yydebug(VALUE self);
static VALUE ripper_parser_set_yydebug(VALUE self, VALUE flag);
static VALUE ripper_parser_get_debug_output(VALUE self);
static VALUE ripper_parser_set_debug_output(VALUE self, VALUE output);

/*
 *  call-seq:
 *    ripper.error?   -> Boolean
 *
 *  Return true if parsed source has errors.
 */
static VALUE
ripper_error_p(VALUE vparser)
{
    struct parser_params *p;

    TypedData_Get_Struct(vparser, struct parser_params, &parser_data_type, p);
    return p->error_p ? Qtrue : Qfalse;
}
#endif

/*
 *  call-seq:
 *    ripper.end_seen?   -> Boolean
 *
 *  Return true if parsed source ended by +\_\_END\_\_+.
 */
VALUE
rb_parser_end_seen_p(VALUE vparser)
{
    struct parser_params *p;

    TypedData_Get_Struct(vparser, struct parser_params, &parser_data_type, p);
    return p->ruby__end__seen ? Qtrue : Qfalse;
}

/*
 *  call-seq:
 *    ripper.encoding   -> encoding
 *
 *  Return encoding of the source.
 */
VALUE
rb_parser_encoding(VALUE vparser)
{
    struct parser_params *p;

    TypedData_Get_Struct(vparser, struct parser_params, &parser_data_type, p);
    return rb_enc_from_encoding(p->enc);
}

#ifdef RIPPER
/*
 *  call-seq:
 *    ripper.yydebug   -> true or false
 *
 *  Get yydebug.
 */
VALUE
rb_parser_get_yydebug(VALUE self)
{
    struct parser_params *p;

    TypedData_Get_Struct(self, struct parser_params, &parser_data_type, p);
    return p->debug ? Qtrue : Qfalse;
}
#endif

/*
 *  call-seq:
 *    ripper.yydebug = flag
 *
 *  Set yydebug.
 */
VALUE
rb_parser_set_yydebug(VALUE self, VALUE flag)
{
    struct parser_params *p;

    TypedData_Get_Struct(self, struct parser_params, &parser_data_type, p);
    p->debug = RTEST(flag);
    return flag;
}

/*
 *  call-seq:
 *    ripper.debug_output   -> obj
 *
 *  Get debug output.
 */
VALUE
rb_parser_get_debug_output(VALUE self)
{
    struct parser_params *p;

    TypedData_Get_Struct(self, struct parser_params, &parser_data_type, p);
    return p->debug_output;
}

/*
 *  call-seq:
 *    ripper.debug_output = obj
 *
 *  Set debug output.
 */
VALUE
rb_parser_set_debug_output(VALUE self, VALUE output)
{
    struct parser_params *p;

    TypedData_Get_Struct(self, struct parser_params, &parser_data_type, p);
    return p->debug_output = output;
}

#ifndef RIPPER
#ifdef YYMALLOC
#define HEAPCNT(n, size) ((n) * (size) / sizeof(YYSTYPE))
/* Keep the order; NEWHEAP then xmalloc and ADD2HEAP to get rid of
 * potential memory leak */
#define NEWHEAP() rb_imemo_tmpbuf_parser_heap(0, p->heap, 0)
#define ADD2HEAP(new, cnt, ptr) ((p->heap = (new))->ptr = (ptr), \
			   (new)->cnt = (cnt), (ptr))

void *
rb_parser_malloc(struct parser_params *p, size_t size)
{
    size_t cnt = HEAPCNT(1, size);
    rb_imemo_tmpbuf_t *n = NEWHEAP();
    void *ptr = xmalloc(size);

    return ADD2HEAP(n, cnt, ptr);
}

void *
rb_parser_calloc(struct parser_params *p, size_t nelem, size_t size)
{
    size_t cnt = HEAPCNT(nelem, size);
    rb_imemo_tmpbuf_t *n = NEWHEAP();
    void *ptr = xcalloc(nelem, size);

    return ADD2HEAP(n, cnt, ptr);
}

void *
rb_parser_realloc(struct parser_params *p, void *ptr, size_t size)
{
    rb_imemo_tmpbuf_t *n;
    size_t cnt = HEAPCNT(1, size);

    if (ptr && (n = p->heap) != NULL) {
	do {
	    if (n->ptr == ptr) {
		n->ptr = ptr = xrealloc(ptr, size);
		if (n->cnt) n->cnt = cnt;
		return ptr;
	    }
	} while ((n = n->next) != NULL);
    }
    n = NEWHEAP();
    ptr = xrealloc(ptr, size);
    return ADD2HEAP(n, cnt, ptr);
}

void
rb_parser_free(struct parser_params *p, void *ptr)
{
    rb_imemo_tmpbuf_t **prev = &p->heap, *n;

    while ((n = *prev) != NULL) {
	if (n->ptr == ptr) {
	    *prev = n->next;
	    rb_gc_force_recycle((VALUE)n);
	    break;
	}
	prev = &n->next;
    }
    xfree(ptr);
}
#endif

void
rb_parser_printf(struct parser_params *p, const char *fmt, ...)
{
    va_list ap;
    VALUE mesg = p->debug_buffer;

    if (NIL_P(mesg)) p->debug_buffer = mesg = rb_str_new(0, 0);
    va_start(ap, fmt);
    rb_str_vcatf(mesg, fmt, ap);
    va_end(ap);
    if (RSTRING_END(mesg)[-1] == '\n') {
	rb_io_write(p->debug_output, mesg);
	p->debug_buffer = Qnil;
    }
}

static void
parser_compile_error(struct parser_params *p, const char *fmt, ...)
{
    va_list ap;

    rb_io_flush(p->debug_output);
    p->error_p = 1;
    va_start(ap, fmt);
    p->error_buffer =
	rb_syntax_error_append(p->error_buffer,
			       p->ruby_sourcefile_string,
			       p->ruby_sourceline,
			       rb_long2int(p->lex.pcur - p->lex.pbeg),
			       p->enc, fmt, ap);
    va_end(ap);
}

static size_t
count_char(const char *str, int c)
{
    int n = 0;
    while (str[n] == c) ++n;
    return n;
}

/*
 * strip enclosing double-quotes, same as the default yytnamerr except
 * for that single-quotes matching back-quotes do not stop stripping.
 *
 *  "\"`class' keyword\"" => "`class' keyword"
 */
RUBY_FUNC_EXPORTED size_t
rb_yytnamerr(struct parser_params *p, char *yyres, const char *yystr)
{
    YYUSE(p);
    if (*yystr == '"') {
	size_t yyn = 0, bquote = 0;
	const char *yyp = yystr;

	while (*++yyp) {
	    switch (*yyp) {
	      case '`':
		if (!bquote) {
		    bquote = count_char(yyp+1, '`') + 1;
		    if (yyres) memcpy(&yyres[yyn], yyp, bquote);
		    yyn += bquote;
		    yyp += bquote - 1;
		    break;
		}
		goto default_char;

	      case '\'':
		if (bquote && count_char(yyp+1, '\'') + 1 == bquote) {
		    if (yyres) memcpy(yyres + yyn, yyp, bquote);
		    yyn += bquote;
		    yyp += bquote - 1;
		    bquote = 0;
		    break;
		}
		if (yyp[1] && yyp[1] != '\'' && yyp[2] == '\'') {
		    if (yyres) memcpy(yyres + yyn, yyp, 3);
		    yyn += 3;
		    yyp += 2;
		    break;
		}
		goto do_not_strip_quotes;

	      case ',':
		goto do_not_strip_quotes;

	      case '\\':
		if (*++yyp != '\\')
		    goto do_not_strip_quotes;
		/* Fall through.  */
	      default_char:
	      default:
		if (yyres)
		    yyres[yyn] = *yyp;
		yyn++;
		break;

	      case '"':
	      case '\0':
		if (yyres)
		    yyres[yyn] = '\0';
		return yyn;
	    }
	}
      do_not_strip_quotes: ;
    }

    if (!yyres) return strlen(yystr);

    return (YYSIZE_T)(yystpcpy(yyres, yystr) - yyres);
}
#endif

#ifdef RIPPER
#ifdef RIPPER_DEBUG
/* :nodoc: */
static VALUE
ripper_validate_object(VALUE self, VALUE x)
{
    if (x == Qfalse) return x;
    if (x == Qtrue) return x;
    if (x == Qnil) return x;
    if (x == Qundef)
	rb_raise(rb_eArgError, "Qundef given");
    if (FIXNUM_P(x)) return x;
    if (SYMBOL_P(x)) return x;
    switch (BUILTIN_TYPE(x)) {
      case T_STRING:
      case T_OBJECT:
      case T_ARRAY:
      case T_BIGNUM:
      case T_FLOAT:
      case T_COMPLEX:
      case T_RATIONAL:
	break;
      case T_NODE:
	if (nd_type((NODE *)x) != NODE_RIPPER) {
	    rb_raise(rb_eArgError, "NODE given: %p", (void *)x);
	}
	x = ((NODE *)x)->nd_rval;
	break;
      default:
	rb_raise(rb_eArgError, "wrong type of ruby object: %p (%s)",
		 (void *)x, rb_obj_classname(x));
    }
    if (!RBASIC_CLASS(x)) {
	rb_raise(rb_eArgError, "hidden ruby object: %p (%s)",
		 (void *)x, rb_builtin_type_name(TYPE(x)));
    }
    return x;
}
#endif

#define validate(x) ((x) = get_value(x))

static VALUE
ripper_dispatch0(struct parser_params *p, ID mid)
{
    return rb_funcall(p->value, mid, 0);
}

static VALUE
ripper_dispatch1(struct parser_params *p, ID mid, VALUE a)
{
    validate(a);
    return rb_funcall(p->value, mid, 1, a);
}

static VALUE
ripper_dispatch2(struct parser_params *p, ID mid, VALUE a, VALUE b)
{
    validate(a);
    validate(b);
    return rb_funcall(p->value, mid, 2, a, b);
}

static VALUE
ripper_dispatch3(struct parser_params *p, ID mid, VALUE a, VALUE b, VALUE c)
{
    validate(a);
    validate(b);
    validate(c);
    return rb_funcall(p->value, mid, 3, a, b, c);
}

static VALUE
ripper_dispatch4(struct parser_params *p, ID mid, VALUE a, VALUE b, VALUE c, VALUE d)
{
    validate(a);
    validate(b);
    validate(c);
    validate(d);
    return rb_funcall(p->value, mid, 4, a, b, c, d);
}

static VALUE
ripper_dispatch5(struct parser_params *p, ID mid, VALUE a, VALUE b, VALUE c, VALUE d, VALUE e)
{
    validate(a);
    validate(b);
    validate(c);
    validate(d);
    validate(e);
    return rb_funcall(p->value, mid, 5, a, b, c, d, e);
}

static VALUE
ripper_dispatch7(struct parser_params *p, ID mid, VALUE a, VALUE b, VALUE c, VALUE d, VALUE e, VALUE f, VALUE g)
{
    validate(a);
    validate(b);
    validate(c);
    validate(d);
    validate(e);
    validate(f);
    validate(g);
    return rb_funcall(p->value, mid, 7, a, b, c, d, e, f, g);
}

static ID
ripper_get_id(VALUE v)
{
    NODE *nd;
    if (!RB_TYPE_P(v, T_NODE)) return 0;
    nd = (NODE *)v;
    if (nd_type(nd) != NODE_RIPPER) return 0;
    return nd->nd_vid;
}

static VALUE
ripper_get_value(VALUE v)
{
    NODE *nd;
    if (v == Qundef) return Qnil;
    if (!RB_TYPE_P(v, T_NODE)) return v;
    nd = (NODE *)v;
    if (nd_type(nd) != NODE_RIPPER) return Qnil;
    return nd->nd_rval;
}

static void
ripper_error(struct parser_params *p)
{
    p->error_p = TRUE;
}

static void
ripper_compile_error(struct parser_params *p, const char *fmt, ...)
{
    VALUE str;
    va_list args;

    va_start(args, fmt);
    str = rb_vsprintf(fmt, args);
    va_end(args);
    rb_funcall(p->value, rb_intern("compile_error"), 1, str);
    ripper_error(p);
}

static VALUE
ripper_lex_get_generic(struct parser_params *p, VALUE src)
{
    VALUE line = rb_funcallv_public(src, id_gets, 0, 0);
    if (!NIL_P(line) && !RB_TYPE_P(line, T_STRING)) {
	rb_raise(rb_eTypeError,
		 "gets returned %"PRIsVALUE" (expected String or nil)",
		 rb_obj_class(line));
    }
    return line;
}

static VALUE
ripper_lex_io_get(struct parser_params *p, VALUE src)
{
    return rb_io_gets(src);
}

static VALUE
ripper_s_allocate(VALUE klass)
{
    struct parser_params *p;
    VALUE self = TypedData_Make_Struct(klass, struct parser_params,
				       &parser_data_type, p);
    p->value = self;
    return self;
}

#define ripper_initialized_p(r) ((r)->lex.input != 0)

/*
 *  call-seq:
 *    Ripper.new(src, filename="(ripper)", lineno=1) -> ripper
 *
 *  Create a new Ripper object.
 *  _src_ must be a String, an IO, or an Object which has #gets method.
 *
 *  This method does not starts parsing.
 *  See also Ripper#parse and Ripper.parse.
 */
static VALUE
ripper_initialize(int argc, VALUE *argv, VALUE self)
{
    struct parser_params *p;
    VALUE src, fname, lineno;

    TypedData_Get_Struct(self, struct parser_params, &parser_data_type, p);
    rb_scan_args(argc, argv, "12", &src, &fname, &lineno);
    if (RB_TYPE_P(src, T_FILE)) {
        p->lex.gets = ripper_lex_io_get;
    }
    else if (rb_respond_to(src, id_gets)) {
        p->lex.gets = ripper_lex_get_generic;
    }
    else {
        StringValue(src);
        p->lex.gets = lex_get_str;
    }
    p->lex.input = src;
    p->eofp = 0;
    if (NIL_P(fname)) {
        fname = STR_NEW2("(ripper)");
	OBJ_FREEZE(fname);
    }
    else {
	StringValueCStr(fname);
	fname = rb_str_new_frozen(fname);
    }
    parser_initialize(p);

    p->ruby_sourcefile_string = fname;
    p->ruby_sourcefile = RSTRING_PTR(fname);
    p->ruby_sourceline = NIL_P(lineno) ? 0 : NUM2INT(lineno) - 1;

    return Qnil;
}

static VALUE
ripper_parse0(VALUE parser_v)
{
    struct parser_params *p;

    TypedData_Get_Struct(parser_v, struct parser_params, &parser_data_type, p);
    parser_prepare(p);
    p->ast = rb_ast_new();
    ripper_yyparse((void*)p);
    rb_ast_dispose(p->ast);
    p->ast = 0;
    return p->result;
}

static VALUE
ripper_ensure(VALUE parser_v)
{
    struct parser_params *p;

    TypedData_Get_Struct(parser_v, struct parser_params, &parser_data_type, p);
    p->parsing_thread = Qnil;
    return Qnil;
}

/*
 *  call-seq:
 *    ripper.parse
 *
 *  Start parsing and returns the value of the root action.
 */
static VALUE
ripper_parse(VALUE self)
{
    struct parser_params *p;

    TypedData_Get_Struct(self, struct parser_params, &parser_data_type, p);
    if (!ripper_initialized_p(p)) {
        rb_raise(rb_eArgError, "method called for uninitialized object");
    }
    if (!NIL_P(p->parsing_thread)) {
        if (p->parsing_thread == rb_thread_current())
            rb_raise(rb_eArgError, "Ripper#parse is not reentrant");
        else
            rb_raise(rb_eArgError, "Ripper#parse is not multithread-safe");
    }
    p->parsing_thread = rb_thread_current();
    rb_ensure(ripper_parse0, self, ripper_ensure, self);

    return p->result;
}

/*
 *  call-seq:
 *    ripper.column   -> Integer
 *
 *  Return column number of current parsing line.
 *  This number starts from 0.
 */
static VALUE
ripper_column(VALUE self)
{
    struct parser_params *p;
    long col;

    TypedData_Get_Struct(self, struct parser_params, &parser_data_type, p);
    if (!ripper_initialized_p(p)) {
        rb_raise(rb_eArgError, "method called for uninitialized object");
    }
    if (NIL_P(p->parsing_thread)) return Qnil;
    col = p->lex.ptok - p->lex.pbeg;
    return LONG2NUM(col);
}

/*
 *  call-seq:
 *    ripper.filename   -> String
 *
 *  Return current parsing filename.
 */
static VALUE
ripper_filename(VALUE self)
{
    struct parser_params *p;

    TypedData_Get_Struct(self, struct parser_params, &parser_data_type, p);
    if (!ripper_initialized_p(p)) {
        rb_raise(rb_eArgError, "method called for uninitialized object");
    }
    return p->ruby_sourcefile_string;
}

/*
 *  call-seq:
 *    ripper.lineno   -> Integer
 *
 *  Return line number of current parsing line.
 *  This number starts from 1.
 */
static VALUE
ripper_lineno(VALUE self)
{
    struct parser_params *p;

    TypedData_Get_Struct(self, struct parser_params, &parser_data_type, p);
    if (!ripper_initialized_p(p)) {
        rb_raise(rb_eArgError, "method called for uninitialized object");
    }
    if (NIL_P(p->parsing_thread)) return Qnil;
    return INT2NUM(p->ruby_sourceline);
}

/*
 *  call-seq:
 *    ripper.state   -> Integer
 *
 *  Return scanner state of current token.
 */
static VALUE
ripper_state(VALUE self)
{
    struct parser_params *p;

    TypedData_Get_Struct(self, struct parser_params, &parser_data_type, p);
    if (!ripper_initialized_p(p)) {
	rb_raise(rb_eArgError, "method called for uninitialized object");
    }
    if (NIL_P(p->parsing_thread)) return Qnil;
    return INT2NUM(p->lex.state);
}

/*
 *  call-seq:
 *    ripper.token   -> String
 *
 *  Return the current token string.
 */
static VALUE
ripper_token(VALUE self)
{
    struct parser_params *p;
    long pos, len;

    TypedData_Get_Struct(self, struct parser_params, &parser_data_type, p);
    if (!ripper_initialized_p(p)) {
        rb_raise(rb_eArgError, "method called for uninitialized object");
    }
    if (NIL_P(p->parsing_thread)) return Qnil;
    pos = p->lex.ptok - p->lex.pbeg;
    len = p->lex.pcur - p->lex.ptok;
    return rb_str_subseq(p->lex.lastline, pos, len);
}

#ifdef RIPPER_DEBUG
/* :nodoc: */
static VALUE
ripper_assert_Qundef(VALUE self, VALUE obj, VALUE msg)
{
    StringValue(msg);
    if (obj == Qundef) {
        rb_raise(rb_eArgError, "%"PRIsVALUE, msg);
    }
    return Qnil;
}

/* :nodoc: */
static VALUE
ripper_value(VALUE self, VALUE obj)
{
    return ULONG2NUM(obj);
}
#endif

/*
 *  call-seq:
 *    Ripper.lex_state_name(integer)   -> string
 *
 *  Returns a string representation of lex_state.
 */
static VALUE
ripper_lex_state_name(VALUE self, VALUE state)
{
    return rb_parser_lex_state_name(NUM2INT(state));
}

void
Init_ripper(void)
{
    ripper_init_eventids1();
    ripper_init_eventids2();
    id_warn = rb_intern_const("warn");
    id_warning = rb_intern_const("warning");
    id_gets = rb_intern_const("gets");
    id_assoc = rb_intern_const("=>");

    (void)yystpcpy; /* may not used in newer bison */

    InitVM(ripper);
}

void
InitVM_ripper(void)
{
    VALUE Ripper;

    Ripper = rb_define_class("Ripper", rb_cObject);
    /* version of Ripper */
    rb_define_const(Ripper, "Version", rb_usascii_str_new2(RIPPER_VERSION));
    rb_define_alloc_func(Ripper, ripper_s_allocate);
    rb_define_method(Ripper, "initialize", ripper_initialize, -1);
    rb_define_method(Ripper, "parse", ripper_parse, 0);
    rb_define_method(Ripper, "column", ripper_column, 0);
    rb_define_method(Ripper, "filename", ripper_filename, 0);
    rb_define_method(Ripper, "lineno", ripper_lineno, 0);
    rb_define_method(Ripper, "state", ripper_state, 0);
    rb_define_method(Ripper, "token", ripper_token, 0);
    rb_define_method(Ripper, "end_seen?", rb_parser_end_seen_p, 0);
    rb_define_method(Ripper, "encoding", rb_parser_encoding, 0);
    rb_define_method(Ripper, "yydebug", rb_parser_get_yydebug, 0);
    rb_define_method(Ripper, "yydebug=", rb_parser_set_yydebug, 1);
    rb_define_method(Ripper, "debug_output", rb_parser_get_debug_output, 0);
    rb_define_method(Ripper, "debug_output=", rb_parser_set_debug_output, 1);
    rb_define_method(Ripper, "error?", ripper_error_p, 0);
#ifdef RIPPER_DEBUG
    rb_define_method(Ripper, "assert_Qundef", ripper_assert_Qundef, 2);
    rb_define_method(Ripper, "rawVALUE", ripper_value, 1);
    rb_define_method(Ripper, "validate_object", ripper_validate_object, 1);
#endif

    rb_define_singleton_method(Ripper, "dedent_string", parser_dedent_string, 2);
    rb_define_private_method(Ripper, "dedent_string", parser_dedent_string, 2);

    rb_define_singleton_method(Ripper, "lex_state_name", ripper_lex_state_name, 1);

<% @exprs.each do |expr, desc| -%>
    /* <%=desc%> */
    rb_define_const(Ripper, "<%=expr%>", INT2NUM(<%=expr%>));
<% end %>
    ripper_init_eventids1_table(Ripper);
    ripper_init_eventids2_table(Ripper);

# if 0
    /* Hack to let RDoc document SCRIPT_LINES__ */

    /*
     * When a Hash is assigned to +SCRIPT_LINES__+ the contents of files loaded
     * after the assignment will be added as an Array of lines with the file
     * name as the key.
     */
    rb_define_global_const("SCRIPT_LINES__", Qnil);
#endif

}
#endif /* RIPPER */

/*
 * Local variables:
 * mode: c
 * c-file-style: "ruby"
 * End:
 */