[antlr-interest] Regular Expressions (2)

[Daniela da Cruz]

Unfortunately Antlr3 is not an option. It is a requirement from my client!
Thanks anyway.
daniela

On Thu, Jul 5, 2012 at 12:50 AM, Brad Cox <bradjcox at gmail.com> wrote:

> Have you considered switching to antlr3 and have you looked at
> http://www.antlr.org/grammar/1212699960054/ObjectiveC2ansi.g?
>
> On Wed, Jul 4, 2012 at 7:26 PM, Daniela da Cruz <danieladacruz at gmail.com>wrote:
>
>>  Hi Ale
>>
>> Thanks for your reply. I have been working a bit more in the grammar and
>> have done the following test and it simply stops at '@' character. Any
>> idea
>> why?
>>
>> *class CParser extends Parser;*
>> *
>>
>> *
>> options {    k=1;    defaultErrorHandler = false;}
>>
>> class_interface : "@interface" IDENTIFIER "@end" ;
>>
>> *class CLexer extends Lexer;*
>>
>>
>> options{
>> testLiterals=false; // don't automatically test for literals
>>  k=2;
>> charVocabulary='\u0000'..'\uFFFE';
>> }
>>
>> IDENTIFIER : LETTER (LETTER|'0'..'9')*;
>> protected LETTER: 'A'..'Z'  | 'a'..'z'  | '_' ;
>>
>>
>> On Thu, Jul 5, 2012 at 12:22 AM, Ale Strooisma <alestrooisma at gmx.net>
>> wrote:
>>
>> > I guess this would work:
>> >
>> > AT_PROTECTED : AT "protected";
>> > AT_PRIVATE : AT "private";
>> > fragment AT : "@";
>> >
>> > Good luck,
>> > Ale
>> >
>> > On 07/05/2012 12:20 AM, Daniela da Cruz wrote:
>> > > Sorry. The previous email was sent before I finish it.
>> > >
>> > > Hello all
>> > >
>> > > I am developing an Objective-C 2.0 grammar using the Antlr v2.7.
>> > > The problem I'm facing is that there exist some ambiguous reserved
>> words.
>> > > For instance and using k = 1 in Lexer, there exist
>> > >
>> > > @protected, @private, @public, @interface, in, inout, ...
>> > >
>> > > defining these regular expressions like:
>> > >
>> > > AT_PROTECTED : "@protected" ;
>> > > AT_PRIVATE : "@private" ;
>> > >
>> > > Using this approach, of course, I get a lot of warnings because they
>> are
>> > > ambiguous.
>> > >
>> > > How do you suggest to solve them?
>> > >
>> > > Factorize them and then set the token type accordingly?
>> > >
>> > > Thanks
>> > > daniela
>> > >
>> > > List: http://www.antlr.org/mailman/listinfo/antlr-interest
>> > > Unsubscribe:
>> > http://www.antlr.org/mailman/options/antlr-interest/your-email-address
>> > >
>> >
>> >
>> > List: http://www.antlr.org/mailman/listinfo/antlr-interest
>> > Unsubscribe:
>> > http://www.antlr.org/mailman/options/antlr-interest/your-email-address
>> >
>>
>> List: http://www.antlr.org/mailman/listinfo/antlr-interest
>> Unsubscribe:
>> http://www.antlr.org/mailman/options/antlr-interest/your-email-address
>>
>
>
>
> --
> Cell: 703-594-1883
> Blog: http://bradjcox.blogspot.com
> Web: http://virtualschool.edu
> Manassas VA 20111
>
>