On Mon, 8 Feb 2010, Supervisor Root wrote:
> I used bison2.4.1,
Okay.
> yacc1.9.1
We only support Bison here.
> and flex2.5.4
Flex 2.5.4 is very old. I'm using Flex 2.5.34 at the moment. However,
off the top of my head, I don't see how updating would address your
problem.
> to create a simple parser
> under windows XP platform, but I found that yyparse return zero when
> syntax is error, this is or not a bug?
> condition: TRUE
> | FALSE
> | error {}
> ;
The last production here allows the parser to enter error recovery mode.
If it recovers and then completes the parse successfully, then it returns
0.
> if (nRet == 0)
> {
> printf("This is a corrent program!\n");
> }
> else
> {
> printf("This is a incorrent program!\n");
> }
It sounds like you want to check nRet == 0 && yynerrs == 0.
> In addition, the parser runs normal under linux platform. (yyparse
> returns non-zero under linux platform
I just tried your original code and example input on linux (Ubuntu 8.04),
and yyparse returned zero.
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