Bison unexpected indentifier error

Question

%{
#include <stdio.h>
#include <string.h>

void yyerror(const char *str)
{
        fprintf(stderr,"error: %s\n",str);
}

int yywrap()
{
        return 1;
}

int main()
{
        yyparse();
}
%}

%token TOKMACHINE TOKLOGIN TOKPASSWORD VALUE SPACE NEWLINE
input: auth input | input;
delim: SPACE | NEWLINE;
auth: TOKMACHINE delim VALUE delim TOKLOGIN delim  VALUE delim  TOKPASSWORD delim VALUE delim
{
    printf("Found auth {%s,%s,%s}", $1,$3,$5);
};

Here is simple bison grammar, with which I want to parse .netrc file. But I get error on input line:

netrc.y:23.1-5: syntax error, unexpected identifier:

I am new to Flex/Bison, but this example near literal copy from here

Line 23 is input: auth input | input;; columns 1-5 are the identifier input, which seems to be what it's complaining about. I don't remember bison well enough to figure out the problem. — Keith Thompson
This is anything but a near literal copy. Look at the original example exactly and you'll spot a handful of differences, all resulting in various errors. Yacc is unforgiving. — Jens
@Jens Of course, this question is about Bison, not Yacc, but they are part of the same bestiary... ;-) — twalberg

Jens Jens · Accepted Answer · 2012-08-24T18:38:22

2

votes

Looks like you are missing the %% delimiter. Make that

%}
%token ...

%%
input : ...

Bison unexpected indentifier error

2 Answers