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Ignoring %prec
From: |
darrenks |
Subject: |
Ignoring %prec |
Date: |
Fri, 25 May 2007 15:06:16 -0400 |
Bison is ignoring %prec for this simple grammar:
%left PRIORITY2
%left PRIORITY1
%token NUMBER
%%
program : expr { };
expr : expr '+' expr %prec PRIORITY2 { };
expr : expr '-' expr %prec PRIORITY2 { };
expr : expr '*' expr %prec PRIORITY1 { };
expr : expr '/' expr %prec PRIORITY1 { };
expr : NUMBER { };
%%
int yyerror(char *s) {
fprintf(stderr, "error, line %d: %s\n", yylineno, s);
return 0;
}
int main(int argc, char **argv) {
yyparse();
return 0;
}
#include "lex.yy.c"
I realize a work around is to not use %prec for this, but this is not
an option for my purposes because I am attempting to create the bison
grammar file automatically from a format where one specifies priority
with a number in the rules.
If this is not a bug, I would appreciate any help on how to make this
work properly because from all the documentation I have read it seems
it ought to.
Attached is debug version + the lex file for testing purposes.
Thanks,
Darren
bugreport.tgz
Description: GNU Zip compressed data
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