parsing function name and arguments

Lee <lchaplin13@gmail.com>
Thu, 9 May 2013 04:05:30 -0700 (PDT)

          From comp.compilers

Related articles
parsing function name and arguments lchaplin13@gmail.com (Lee) (2013-05-09)
Re: parsing function name and arguments haberg-news@telia.com (Hans Aberg) (2013-05-10)
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From: Lee <lchaplin13@gmail.com>
Newsgroups: comp.compilers
Date: Thu, 9 May 2013 04:05:30 -0700 (PDT)
Organization: Compilers Central
Keywords: question, parse
Posted-Date: 10 May 2013 10:11:54 EDT

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



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