Merge pull request #405 from ydah/nested-with-tag

Add support nested parameterizing rules with tag

Author: yui-knk

lib/lrama/parser.rb

@@ -282,10 +282,10 @@ rule
                 builder.symbols << Lrama::Lexer::Token::InstantiateRule.new(s_value: val[2], location: @lexer.location, args: [val[1]])
                 result = builder
               }
-          | rule_rhs IDENTIFIER "(" parameterizing_args ")"
+          | rule_rhs IDENTIFIER "(" parameterizing_args ")" tag_opt
               {
                 builder = val[0]
-                builder.symbols << Lrama::Lexer::Token::InstantiateRule.new(s_value: val[1].s_value, location: @lexer.location, args: val[3])
+                builder.symbols << Lrama::Lexer::Token::InstantiateRule.new(s_value: val[1].s_value, location: @lexer.location, args: val[3], lhs_tag: val[5])
                 result = builder
               }
           | rule_rhs "{"

parser.y

@@ -0,0 +1,48 @@
+/*
+ * This is comment for this file.
+ */
+
+%{
+// Prologue
+static int yylex(YYSTYPE *val, YYLTYPE *loc);
+static int yyerror(YYLTYPE *loc, const char *str);
+%}
+
+%union {
+    int i;
+}
+
+%token <i> number
+
+%rule nested_nested_option(X): /* empty */
+                              | X
+                              ;
+
+%rule nested_option(X): /* empty */
+                       | nested_nested_option(X) <i>
+                       ;
+
+%rule option(Y): /* empty */
+               | nested_option(Y) <i>
+               ;
+
+%%
+
+program         : option(number) <i>
+                ;
+
+%%
+
+static int yylex(YYSTYPE *yylval, YYLTYPE *loc)
+{
+  return 0;
+}
+
+static int yyerror(YYLTYPE *loc, const char *str)
+{
+  return 0;
+}
+
+int main(int argc, char *argv[])
+{
+}