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Re: [imp-dev] Case-insensitiv lexer - lpg

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
 
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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)


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