From f169043d81524b5b529f2c1e9c35437ba5bc3a7a Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 23 Apr 2019 13:14:27 +0900
Subject: Add pipeline operator [Feature #15799]

---
 parse.y | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

(limited to 'parse.y')

diff --git a/parse.y b/parse.y
index c78f5139f7..6f282d8014 100644
--- a/parse.y
+++ b/parse.y
@@ -1002,7 +1002,7 @@ static void token_info_warn(struct parser_params *p, const char *token, token_in
 %type <node> literal numeric simple_numeric ssym dsym symbol cpath
 %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> expr_value expr_value_do arg_value primary_value fcall rel_expr pipeline
 %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
@@ -1060,6 +1060,7 @@ static void token_info_warn(struct parser_params *p, const char *token, token_in
 %token <id> tANDDOT	RUBY_TOKEN(ANDDOT) "&."
 %token <id> tCOLON2	RUBY_TOKEN(COLON2) "::"
 %token <id> tMETHREF	RUBY_TOKEN(METHREF) ".:"
+%token tPIPE		RUBY_TOKEN(PIPE) "|>"
 %token tCOLON3		":: at EXPR_BEG"
 %token <id> tOP_ASGN	"operator-assignment" /* +=, -=  etc. */
 %token tASSOC		"=>"
@@ -1095,6 +1096,7 @@ static void token_info_warn(struct parser_params *p, const char *token, token_in
 %nonassoc  modifier_if modifier_unless modifier_while modifier_until
 %left  keyword_or keyword_and
 %right keyword_not
+%left  tPIPE
 %nonassoc keyword_defined
 %right '=' tOP_ASGN
 %left modifier_rescue
@@ -2269,12 +2271,29 @@ arg		: lhs '=' arg_rhs
 		    /*% %*/
 		    /*% ripper: ifop!($1, $3, $6) %*/
 		    }
+		| pipeline
 		| primary
 		    {
 			$$ = $1;
 		    }
 		;
 
+pipeline	: arg tPIPE operation2 opt_paren_args
+		    {
+		    /*%%%*/
+			$$ = new_command_qcall(p, ID2VAL(idPIPE), $1, $3, $4, Qnull, &@3, &@$);
+		    /*% %*/
+		    /*% ripper: command_call!($1, ID2VAL(idPIPE), $3, $4) %*/
+		    }
+		| arg tPIPE operation2 opt_paren_args brace_block
+		    {
+		    /*%%%*/
+			$$ = new_command_qcall(p, ID2VAL(idPIPE), $1, $3, $4, $5, &@3, &@$);
+		    /*% %*/
+		    /*% ripper: method_add_block!(command_call!($1, ID2VAL(idPIPE), $3, $4), $5) %*/
+		    }
+		;
+
 relop		: '>'  {$$ = '>';}
 		| '<'  {$$ = '<';}
 		| tGEQ {$$ = idGE;}
@@ -8924,6 +8943,10 @@ parser_yylex(struct parser_params *p)
 	    SET_LEX_STATE(EXPR_BEG);
 	    return tOP_ASGN;
 	}
+	if (c == '>') {
+	    SET_LEX_STATE(EXPR_DOT);
+	    return tPIPE;
+	}
 	SET_LEX_STATE(IS_AFTER_OPERATOR() ? EXPR_ARG : EXPR_BEG|EXPR_LABEL);
 	pushback(p, c);
 	return '|';
-- 
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