Re: Advice needed, please

[dummy Taurus]

On Sun, Jun 7, 2009 at 6:04 AM, Hans Aberg <address@hidden> wrote:

> On 6 Jun 2009, at 23:29, xelanoimis wrote:
>
>  I'm updating my scripting language and I need some help from someone more
>> experienced with bison who would like to have a look at my grammar. As it
>> is
>> now it works fine, but I just want to make sure I didn't do any bad things
>> in there. Or if there's a way to "optimize" it, make the result smaller,
>> faster, etc...
>>
>
> You might inquiry the Usenet newsgroup comp.compilers.
>
>  I have some "shift/reduce conflicts" and I wonder if I must fix them or
>> just
>> use the %expect option to silence the warning.
>>
>
> Opinions differ, but not fixing could indicate grammar errors. Look into
> the .output file for the parsing "." in the conflicting rules, and set token
> precedences on the tokens immediately before and after.
>
>  Also I wonder about reporting the parser error. I get the line number but
>> it
>> doesn't always say a suggestive message, like missing ';' or missing '}'.
>> For example when I have an error in the top level it says: "parse error,
>> expecting '$". I'm not sure where this came from and how can I get a
>> better
>> message.
>>
>
> These are default messages that Bison generates. Better ones are on the
> todo list.
>
>  Hans


You can use %error-verbose to get more detailed error message.

Huang