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Re: [imp-dev] Case-insensitiv lexer - lpg
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Our language is case insensitive. We use a file called
LexerFoldedCaseMap.gi with entries like
tokenKind['A'] = $prefix$a$suffix$;
tokenKind['B'] = $prefix$b$suffix$;
tokenKind['C'] = $prefix$c$suffix$;
This works for us. I think I found LexerFoldedCaseMap.gi in the imp/lpg
distribution somewhere, but if you want me to send you a copy, just ask.
(I have no idea what the $sym_type. in Bob's suggestion is.)
Beverly
On Tue, March 29, 2011 10:07 am, Robert M. Fuhrer wrote:
> Hi Ovidiu,
>
> I'm cc'ing Philippe Charles, the main author of LPG, in case he has
> something to add.
>
> I think you need to use a modified copy of the LexerBasicMapF.gi include
> file to effect the case-folding you're looking for.
>
> Specifically, to fold everything to lower-case, find the letter-related
> entries in the tokenKind[] array that look like:
>
> $sym_type.$prefix$A$suffix$, // 065 0x41
> $sym_type.$prefix$B$suffix$, // 066 0x42
> $sym_type.$prefix$C$suffix$, // 067 0x43
> ...
>
> and replace them with their lower-case equivalents:
>
> $sym_type.$prefix$a$suffix$, // 097 0x61
> $sym_type.$prefix$b$suffix$, // 098 0x62
> $sym_type.$prefix$c$suffix$, // 099 0x63
> ...
>
> I haven't actually tried this myself, but I believe it should work.
>
> On Mar 29, 2011, at 9:26 AM, Ovidiu Diac wrote:
>
>> Hi,
>>
>> I'm currently working on an ide for a Java-like scripting language. The
>> problem i have is that this script is supposed to be case-insensitive.
>> I managed to make the keywords case-insensitive by using the
>> KWLexerFoldedCaseMapF.gi include in KWLexer but i don't know what to do
>> about identifiers. - i'm using the lpg parser
>> Any help is much appreciated.
>> Thanks,
>> Ovidiu Diac
>>
>> _______________________________________________
>> imp-dev mailing list
>> imp-dev@xxxxxxxxxxx
>> https://dev.eclipse.org/mailman/listinfo/imp-dev
>
> --
> Cheers,
> -- Bob
> --------------------------------
> Robert M. Fuhrer
> Research Staff Member
> Programming Technologies Dept.
> IBM T.J. Watson Research Center
>
> IMP Team Lead (http://www.eclipse.org/imp)
> X10: Productivity for High-Performance Parallel Programming
> (http://x10-lang.org)
>
> _______________________________________________
> imp-dev mailing list
> imp-dev@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/imp-dev
>
--
Beverly A. Sanders, Ph.D.
Associate Professor
Department of Computer & Information Science & Engineering
P.O. Box 116120
University of Florida
Gainesville, FL 32611-6120
www.cise.ufl.edu/~sanders
tel: (352) 450-9213
fax: (352) 392-1220
