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From: Lee <lchaplin13@gmail.com>
Newsgroups: comp.compilers
Subject: parsing function name and arguments
Date: Thu, 9 May 2013 04:05:30 -0700 (PDT)
Organization: Compilers Central
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Hi all,

I am strugling with this simple thing, any help will be greatly appreciated.
I would like to extract the name and the argument from the following line:
FUNCTION Entry (args)
I have the flex file defined as:
%{
#include <fct.tab.h>
%}
T_FUNCTION      FUNCTION
SYMBOL_ID       [a-zA-Z]+[a-zA-Z0-9_]*
OPEN_PARA       [\(]
CLOSE_PARA      [\)]
WHITE_SPACE     [ \t\f\r\v]+
NEW_LINE        [\n]
%%
{T_FUNCTION}      { printf("1.yylval =  %s\n", yytext);
                    return (FUNCTION);
                  }
{SYMBOL_ID}       { printf("2.yylval =  %s\n", yytext);
                    yylval.all_str = yytext;
                    return (SYMBOLID);
                    }
{OPEN_PARA}     { return ('('); }
{CLOSE_PARA}    { return (')'); }
{WHITE_SPACE}   { }
<<EOF>>         { yyterminate(); }
.               { printf("3.error_msg = yytext : %s\n", yytext);
                  return(0);
                }
%%
int main()
{
printf("Starting...\n\n");
return yyparse();
}

and the grammar as:

%{
    void yyerror(char *s);
%}
    %union {
      int intnum;
      char *all_str;
    }

    %token FUNCTION
    %token <all_str> SYMBOLID
    %type <program> program
    %start program
    %%
    program
                : FUNCTION SYMBOLID '(' SYMBOLID ')'
                    { printf("FUNCTION SYMBOL = %s\n", $2);
                      printf("func name and args: '%s' '%s'\n", $2, $4);
                    }
    ;
    %%
    void yyerror(char *s)
    {
    printf("Errors\n");
    exit(1);
    }

The lexer is extracting corectly the tokens but not the grammar. I'am using flex and bison from GNUWin distribution (tested on ubuntu same result).

Thanks,
Lee