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

  class.c -

  $Author$
  $Date$
  created at: Tue Aug 10 15:05:44 JST 1993

  Copyright (C) 1993-2002 Yukihiro Matsumoto

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

#include "ruby.h"
#include "rubysig.h"
#include "node.h"
#include "st.h"
#include <ctype.h>

extern st_table *rb_class_tbl;

VALUE
rb_class_boot(super)
    VALUE super;
{
    NEWOBJ(klass, struct RClass);
    OBJSETUP(klass, rb_cClass, T_CLASS);

    klass->super = super;
    klass->iv_tbl = 0;
    klass->m_tbl = 0;		/* safe GC */
    klass->m_tbl = st_init_numtable();

    OBJ_INFECT(klass, super);
    return (VALUE)klass;
}

VALUE
rb_class_new(super)
    VALUE super;
{
    Check_Type(super, T_CLASS);
    if (super == rb_cClass) {
	rb_raise(rb_eTypeError, "can't make subclass of Class");
    }
    if (FL_TEST(super, FL_SINGLETON)) {
	rb_raise(rb_eTypeError, "can't make subclass of virtual class");
    }
    return rb_class_boot(super);
}

static int
clone_method(mid, body, tbl)
    ID mid;
    NODE *body;
    st_table *tbl;
{
    st_insert(tbl, mid, NEW_METHOD(body->nd_body, body->nd_noex));
    return ST_CONTINUE;
}

VALUE
rb_mod_clone(module)
    VALUE module;
{
    NEWOBJ(clone, struct RClass);
    CLONESETUP(clone, module);

    RCLASS(clone)->super = RCLASS(module)->super;
    if (RCLASS(module)->iv_tbl) {
	ID id;

	RCLASS(clone)->iv_tbl = st_copy(RCLASS(module)->iv_tbl);
	id = rb_intern("__classpath__");
	st_delete(RCLASS(clone)->iv_tbl, &id, 0);
	id = rb_intern("__classid__");
	st_delete(RCLASS(clone)->iv_tbl, &id, 0);
    }
    if (RCLASS(module)->m_tbl) {
	RCLASS(clone)->m_tbl = st_init_numtable();
	st_foreach(RCLASS(module)->m_tbl, clone_method, RCLASS(clone)->m_tbl);
    }

    return (VALUE)clone;
}

VALUE
rb_mod_dup(mod)
    VALUE mod;
{
    VALUE dup = rb_mod_clone(mod);

    RBASIC(dup)->flags = RBASIC(mod)->flags & (T_MASK|FL_TAINT|FL_SINGLETON);
    return dup;
}

VALUE
rb_singleton_class_clone(obj)
    VALUE obj;
{
    VALUE klass = RBASIC(obj)->klass;

    if (!FL_TEST(klass, FL_SINGLETON))
	return klass;
    else {
	/* copy singleton(unnamed) class */
	NEWOBJ(clone, struct RClass);
	OBJSETUP(clone, 0, RBASIC(klass)->flags);

	if (BUILTIN_TYPE(obj) == T_CLASS) {
	    RBASIC(clone)->klass = (VALUE)clone;
	}
	else {
	    RBASIC(clone)->klass = rb_singleton_class_clone(klass);
	}

	clone->super = RCLASS(klass)->super;
	clone->iv_tbl = 0;
	clone->m_tbl = 0;
	if (RCLASS(klass)->iv_tbl) {
	    clone->iv_tbl = st_copy(RCLASS(klass)->iv_tbl);
	}
	clone->m_tbl = st_init_numtable();
	st_foreach(RCLASS(klass)->m_tbl, clone_method, clone->m_tbl);
	rb_singleton_class_attached(RBASIC(clone)->klass, (VALUE)clone);
	FL_SET(clone, FL_SINGLETON);
	return (VALUE)clone;
    }
}

void
rb_singleton_class_attached(klass, obj)
    VALUE klass, obj;
{
    if (FL_TEST(klass, FL_SINGLETON)) {
	if (!RCLASS(klass)->iv_tbl) {
	    RCLASS(klass)->iv_tbl = st_init_numtable();
	}
	st_insert(RCLASS(klass)->iv_tbl, rb_intern("__attached__"), obj);
    }
}

VALUE
rb_make_metaclass(obj, super)
    VALUE obj, super;
{
    VALUE klass = rb_class_boot(super);
    FL_SET(klass, FL_SINGLETON);
    RBASIC(obj)->klass = klass;
    rb_singleton_class_attached(klass, obj);
    if (BUILTIN_TYPE(obj) == T_CLASS) {
	RBASIC(klass)->klass = klass;
    }

    return klass;
}

VALUE
rb_define_class_id(id, super)
    ID id;
    VALUE super;
{
    VALUE klass;

    if (!super) super = rb_cObject;
    klass = rb_class_new(super);
    rb_name_class(klass, id);
    rb_make_metaclass(klass, RBASIC(super)->klass);

    return klass;
}

VALUE
rb_class_inherited(super, klass)
    VALUE super, klass;
{
    if (!super) super = rb_cObject;
    return rb_funcall(super, rb_intern("inherited"), 1, klass);
}

VALUE
rb_define_class(name, super)
    const char *name;
    VALUE super;
{
    VALUE klass;
    ID id;

    id = rb_intern(name);
    if (rb_autoload_defined(id)) {
	rb_autoload_load(id);
    }
    if (rb_const_defined(rb_cObject, id)) {
	klass = rb_const_get(rb_cObject, id);
	if (TYPE(klass) != T_CLASS) {
	    rb_raise(rb_eTypeError, "%s is not a class", name);
	}
	if (rb_class_real(RCLASS(klass)->super) != super) {
	    rb_name_error(id, "%s is already defined", name);
	}
	return klass;
    }
    if (!super) {
	rb_warn("no super class for `%s', Object assumed", name);
    }
    klass = rb_define_class_id(id, super);
    rb_class_inherited(super, klass);
    st_add_direct(rb_class_tbl, id, klass);

    return klass;
}

VALUE
rb_define_class_under(outer, name, super)
    VALUE outer;
    const char *name;
    VALUE super;
{
    VALUE klass;
    ID id;

    id = rb_intern(name);
    if (rb_const_defined_at(outer, id)) {
	klass = rb_const_get(outer, id);
	if (TYPE(klass) != T_CLASS) {
	    rb_raise(rb_eTypeError, "%s is not a class", name);
	}
	if (rb_class_real(RCLASS(klass)->super) != super) {
	    rb_name_error(id, "%s is already defined", name);
	}
	return klass;
    }
    if (!super) {
	rb_warn("no super class for `%s::%s', Object assumed",
		rb_class2name(outer), name);
    }
    klass = rb_define_class_id(id, super);
    rb_set_class_path(klass, outer, name);
    rb_class_inherited(super, klass);
    rb_const_set(outer, id, klass);

    return klass;
}

VALUE
rb_module_new()
{
    NEWOBJ(mdl, struct RClass);
    OBJSETUP(mdl, rb_cModule, T_MODULE);

    mdl->super = 0;
    mdl->iv_tbl = 0;
    mdl->m_tbl = 0;
    mdl->m_tbl = st_init_numtable();

    return (VALUE)mdl;
}

VALUE
rb_define_module_id(id)
    ID id;
{
    VALUE mdl;

    mdl = rb_module_new();
    rb_name_class(mdl, id);

    return mdl;
}

VALUE
rb_define_module(name)
    const char *name;
{
    VALUE module;
    ID id;

    id = rb_intern(name);
    if (rb_autoload_defined(id)) {
	rb_autoload_load(id);
    }
    if (rb_const_defined(rb_cObject, id)) {
	module = rb_const_get(rb_cObject, id);
	if (TYPE(module) == T_MODULE)
	    return module;
	rb_raise(rb_eTypeError, "%s is not a module", rb_class2name(CLASS_OF(module)));
    }
    module = rb_define_module_id(id);
    st_add_direct(rb_class_tbl, id, module);

    return module;
}

VALUE
rb_define_module_under(outer, name)
    VALUE outer;
    const char *name;
{
    VALUE module;
    ID id;

    id = rb_intern(name);
    if (rb_const_defined_at(outer, id)) {
	module = rb_const_get(outer, id);
	if (TYPE(module) == T_MODULE)
	    return module;
	rb_raise(rb_eTypeError, "%s::%s is not a module",
		 rb_class2name(outer), rb_class2name(CLASS_OF(module)));
    }
    module = rb_define_module_id(id);
    rb_const_set(outer, id, module);
    rb_set_class_path(module, outer, name);

    return module;
}

static VALUE
include_class_new(module, super)
    VALUE module, super;
{
    NEWOBJ(klass, struct RClass);
    OBJSETUP(klass, rb_cClass, T_ICLASS);

    if (BUILTIN_TYPE(module) == T_ICLASS) {
	module = RBASIC(module)->klass;
    }
    if (!RCLASS(module)->iv_tbl) {
	RCLASS(module)->iv_tbl = st_init_numtable();
    }
    klass->iv_tbl = RCLASS(module)->iv_tbl;
    klass->m_tbl = RCLASS(module)->m_tbl;
    klass->super = super;
    if (TYPE(module) == T_ICLASS) {
	RBASIC(klass)->klass = RBASIC(module)->klass;
    }
    else {
	RBASIC(klass)->klass = module;
    }
    OBJ_INFECT(klass, module);
    OBJ_INFECT(klass, super);

    return (VALUE)klass;
}

void
rb_include_module(klass, module)
    VALUE klass, module;
{
    VALUE p, c;
    int changed = 0;

    rb_frozen_class_p(klass);
    if (!OBJ_TAINTED(klass)) {
	rb_secure(4);
    }
    
    if (NIL_P(module)) return;
    if (klass == module) return;

    switch (TYPE(module)) {
      case T_MODULE:
      case T_CLASS:
      case T_ICLASS:
	break;
      default:
	Check_Type(module, T_MODULE);
    }

    OBJ_INFECT(klass, module);
    c = klass;
    while (module) {
	int superclass_seen = Qfalse;

	if (RCLASS(klass)->m_tbl == RCLASS(module)->m_tbl)
	    rb_raise(rb_eArgError, "cyclic include detected");
	/* ignore if the module included already in superclasses */
	for (p = RCLASS(klass)->super; p; p = RCLASS(p)->super) {
	    switch (BUILTIN_TYPE(p)) {
	      case T_ICLASS:
		if (RCLASS(p)->m_tbl == RCLASS(module)->m_tbl) {
		    if (!superclass_seen) {
			c = p;	/* move insertion point */
		    }
		    goto skip;
		}
		break;
	      case T_CLASS:
		superclass_seen = Qtrue;
		break;
	    }
	}
	c = RCLASS(c)->super = include_class_new(module, RCLASS(c)->super);
	changed = 1;
      skip:
	module = RCLASS(module)->super;
    }
    if (changed) rb_clear_cache();
}

VALUE
rb_mod_included_modules(mod)
    VALUE mod;
{
    VALUE ary = rb_ary_new();
    VALUE p;

    for (p = RCLASS(mod)->super; p; p = RCLASS(p)->super) {
	if (BUILTIN_TYPE(p) == T_ICLASS) {
	    rb_ary_push(ary, RBASIC(p)->klass);
	}
    }
    return ary;
}

VALUE
rb_mod_include_p(mod, mod2)
    VALUE mod;
    VALUE mod2;
{
    VALUE p;

    Check_Type(mod2, T_MODULE);
    for (p = RCLASS(mod)->super; p; p = RCLASS(p)->super) {
	if (BUILTIN_TYPE(p) == T_ICLASS) {
	    if (RBASIC(p)->klass == mod2) return Qtrue;
	}
    }
    return Qfalse;
}

VALUE
rb_mod_ancestors(mod)
    VALUE mod;
{
    VALUE ary = rb_ary_new();
    VALUE p;

    for (p = mod; p; p = RCLASS(p)->super) {
	if (FL_TEST(p, FL_SINGLETON))
	    continue;
	if (BUILTIN_TYPE(p) == T_ICLASS) {
	    rb_ary_push(ary, RBASIC(p)->klass);
	}
	else {
	    rb_ary_push(ary, p);
	}
    }
    return ary;
}

static int
ins_methods_i(key, body, ary)
    ID key;
    NODE *body;
    VALUE ary;
{
    if ((body->nd_noex&(NOEX_PRIVATE|NOEX_PROTECTED)) == 0) {
	VALUE name = rb_str_new2(rb_id2name(key));

	if (!rb_ary_includes(ary, name)) {
	    if (!body->nd_body) {
		rb_ary_push(ary, Qnil);
	    }
	    rb_ary_push(ary, name);
	}
    }
    else if (body->nd_body && nd_type(body->nd_body) == NODE_ZSUPER) {
	rb_ary_push(ary, Qnil);
	rb_ary_push(ary, rb_str_new2(rb_id2name(key)));
    }
    return ST_CONTINUE;
}

static int
ins_methods_prot_i(key, body, ary)
    ID key;
    NODE *body;
    VALUE ary;
{
    if (!body->nd_body) {
	rb_ary_push(ary, Qnil);
	rb_ary_push(ary, rb_str_new2(rb_id2name(key)));
    }
    else if (body->nd_noex & NOEX_PROTECTED) {
	VALUE name = rb_str_new2(rb_id2name(key));

	if (!rb_ary_includes(ary, name)) {
	    rb_ary_push(ary, name);
	}
    }
    else if (nd_type(body->nd_body) == NODE_ZSUPER) {
	rb_ary_push(ary, Qnil);
	rb_ary_push(ary, rb_str_new2(rb_id2name(key)));
    }
    return ST_CONTINUE;
}

static int
ins_methods_priv_i(key, body, ary)
    ID key;
    NODE *body;
    VALUE ary;
{
    if (!body->nd_body) {
	rb_ary_push(ary, Qnil);
	rb_ary_push(ary, rb_str_new2(rb_id2name(key)));
    }
    else if (body->nd_noex & NOEX_PRIVATE) {
	VALUE name = rb_str_new2(rb_id2name(key));

	if (!rb_ary_includes(ary, name)) {
	    rb_ary_push(ary, name);
	}
    }
    else if (nd_type(body->nd_body) == NODE_ZSUPER) {
	rb_ary_push(ary, Qnil);
	rb_ary_push(ary, rb_str_new2(rb_id2name(key)));
    }
    return ST_CONTINUE;
}

static VALUE
method_list(mod, option, func)
    VALUE mod;
    int option;
    int (*func)();
{
    VALUE ary;
    VALUE klass;
    VALUE *p, *q, *pend;

    ary = rb_ary_new();
    for (klass = mod; klass; klass = RCLASS(klass)->super) {
	st_foreach(RCLASS(klass)->m_tbl, func, ary);
	if (!option) break;
    }
    p = q = RARRAY(ary)->ptr; pend = p + RARRAY(ary)->len;
    while (p < pend) {
	if (*p == Qnil) {
	    p+=2;
	    continue;
	}
	*q++ = *p++;
    }
    RARRAY(ary)->len = q - RARRAY(ary)->ptr;
    return ary;
}

VALUE
rb_class_instance_methods(argc, argv, mod)
    int argc;
    VALUE *argv;
    VALUE mod;
{
    VALUE option;

    rb_scan_args(argc, argv, "01", &option);
    return method_list(mod, RTEST(option), ins_methods_i);
}

VALUE
rb_class_protected_instance_methods(argc, argv, mod)
    int argc;
    VALUE *argv;
    VALUE mod;
{
    VALUE option;

    rb_scan_args(argc, argv, "01", &option);
    return method_list(mod, RTEST(option), ins_methods_prot_i);
}

VALUE
rb_class_private_instance_methods(argc, argv, mod)
    int argc;
    VALUE *argv;
    VALUE mod;
{
    VALUE option;

    rb_scan_args(argc, argv, "01", &option);
    return method_list(mod, RTEST(option), ins_methods_priv_i);
}

VALUE
rb_obj_singleton_methods(argc, argv, obj)
    int argc;
    VALUE *argv;
    VALUE obj;
{
    VALUE all;
    VALUE ary;
    VALUE klass;
    VALUE *p, *q, *pend;

    rb_scan_args(argc, argv, "01", &all);
    ary = rb_ary_new();
    klass = CLASS_OF(obj);
    while (klass && FL_TEST(klass, FL_SINGLETON)) {
	st_foreach(RCLASS(klass)->m_tbl, ins_methods_i, ary);
	klass = RCLASS(klass)->super;
    }
    if (RTEST(all)) {
	while (klass && TYPE(klass) == T_ICLASS) {
	    st_foreach(RCLASS(klass)->m_tbl, ins_methods_i, ary);
	    klass = RCLASS(klass)->super;
	}
    }
    p = q = RARRAY(ary)->ptr; pend = p + RARRAY(ary)->len;
    while (p < pend) {
	if (*p == Qnil) {
	    p+=2;
	    continue;
	}
	*q++ = *p++;
    }
    RARRAY(ary)->len = q - RARRAY(ary)->ptr;

    return ary;
}

void
rb_define_method_id(klass, name, func, argc)
    VALUE klass;
    ID name;
    VALUE (*func)();
    int argc;
{
    rb_add_method(klass, name, NEW_CFUNC(func,argc), NOEX_PUBLIC|NOEX_CFUNC);
}

void
rb_define_method(klass, name, func, argc)
    VALUE klass;
    const char *name;
    VALUE (*func)();
    int argc;
{
    ID id = rb_intern(name);

    rb_add_method(klass, id, NEW_CFUNC(func, argc), 
		  ((name[0] == 'i' && id == rb_intern("initialize"))?
		   NOEX_PRIVATE:NOEX_PUBLIC)|NOEX_CFUNC);
}

void
rb_define_protected_method(klass, name, func, argc)
    VALUE klass;
    const char *name;
    VALUE (*func)();
    int argc;
{
    rb_add_method(klass, rb_intern(name), NEW_CFUNC(func, argc),
		  NOEX_PROTECTED|NOEX_CFUNC);
}

void
rb_define_private_method(klass, name, func, argc)
    VALUE klass;
    const char *name;
    VALUE (*func)();
    int argc;
{
    rb_add_method(klass, rb_intern(name), NEW_CFUNC(func, argc),
		  NOEX_PRIVATE|NOEX_CFUNC);
}

void
rb_undef_method(klass, name)
    VALUE klass;
    const char *name;
{
    rb_add_method(klass, rb_intern(name), 0, NOEX_UNDEF);
}

#define SPECIAL_SINGLETON(x,c) do {\
    if (obj == (x)) {\
	return c;\
    }\
} while (0)

VALUE
rb_singleton_class(obj)
    VALUE obj;
{
    VALUE klass;

    if (FIXNUM_P(obj) || SYMBOL_P(obj)) {
	rb_raise(rb_eTypeError, "can't define singleton");
    }
    if (rb_special_const_p(obj)) {
	SPECIAL_SINGLETON(Qnil, rb_cNilClass);
	SPECIAL_SINGLETON(Qfalse, rb_cFalseClass);
	SPECIAL_SINGLETON(Qtrue, rb_cTrueClass);
	rb_bug("unknown immediate %ld", obj);
    }

    DEFER_INTS;
    if (FL_TEST(RBASIC(obj)->klass, FL_SINGLETON) &&
	(BUILTIN_TYPE(obj) == T_CLASS || /* metaclass (or metaclass of metaclass) */
	 rb_iv_get(RBASIC(obj)->klass, "__attached__") == obj)) {
	klass = RBASIC(obj)->klass;
    }
    else {
	klass = rb_make_metaclass(obj, RBASIC(obj)->klass);
    }
    if (OBJ_TAINTED(obj)) {
	OBJ_TAINT(klass);
    }
    else {
	FL_UNSET(klass, FL_TAINT);
    }
    if (OBJ_FROZEN(obj)) OBJ_FREEZE(klass);
    ALLOW_INTS;

    return klass;
}

void
rb_define_singleton_method(obj, name, func, argc)
    VALUE obj;
    const char *name;
    VALUE (*func)();
    int argc;
{
    rb_define_method(rb_singleton_class(obj), name, func, argc);
}

void
rb_define_module_function(module, name, func, argc)
    VALUE module;
    const char *name;
    VALUE (*func)();
    int argc;
{
    rb_define_private_method(module, name, func, argc);
    rb_define_singleton_method(module, name, func, argc);
}

void
rb_define_global_function(name, func, argc)
    const char *name;
    VALUE (*func)();
    int argc;
{
    rb_define_module_function(rb_mKernel, name, func, argc);
}

void
rb_define_alias(klass, name1, name2)
    VALUE klass;
    const char *name1, *name2;
{
    rb_alias(klass, rb_intern(name1), rb_intern(name2));
}

void
rb_define_attr(klass, name, read, write)
    VALUE klass;
    const char *name;
    int read, write;
{
    rb_attr(klass, rb_intern(name), read, write, Qfalse);
}

#ifdef HAVE_STDARG_PROTOTYPES
#include <stdarg.h>
#define va_init_list(a,b) va_start(a,b)
#else
#include <varargs.h>
#define va_init_list(a,b) va_start(a)
#endif

int
#ifdef HAVE_STDARG_PROTOTYPES
rb_scan_args(int argc, const VALUE *argv, const char *fmt, ...)
#else
rb_scan_args(argc, argv, fmt, va_alist)
    int argc;
    const VALUE *argv;
    const char *fmt;
    va_dcl
#endif
{
    int n, i = 0;
    const char *p = fmt;
    VALUE *var;
    va_list vargs;

    va_init_list(vargs, fmt);

    if (*p == '*') goto rest_arg;

    if (ISDIGIT(*p)) {
	n = *p - '0';
	if (n > argc)
	    rb_raise(rb_eArgError, "wrong number of arguments (%d for %d)", argc, n);
	for (i=0; i<n; i++) {
	    var = va_arg(vargs, VALUE*);
	    if (var) *var = argv[i];
	}
	p++;
    }
    else {
	goto error;
    }

    if (ISDIGIT(*p)) {
	n = i + *p - '0';
	for (; i<n; i++) {
	    var = va_arg(vargs, VALUE*);
	    if (argc > i) {
		if (var) *var = argv[i];
	    }
	    else {
		if (var) *var = Qnil;
	    }
	}
	p++;
    }

    if(*p == '*') {
      rest_arg:
	var = va_arg(vargs, VALUE*);
	if (argc > i) {
	    if (var) *var = rb_ary_new4(argc-i, argv+i);
	    i = argc;
	}
	else {
	    if (var) *var = rb_ary_new();
	}
	p++;
    }

    if (*p == '&') {
	var = va_arg(vargs, VALUE*);
	if (rb_block_given_p()) {
	    *var = rb_f_lambda();
	}
	else {
	    *var = Qnil;
	}
	p++;
    }
    va_end(vargs);

    if (*p != '\0') {
	goto error;
    }

    if (argc > i) {
	rb_raise(rb_eArgError, "wrong number of arguments(%d for %d)", argc, i);
    }

    return argc;

  error:
    rb_fatal("bad scan arg format: %s", fmt);
    return 0;
}