[antlr-interest] Re: Updated version of C# codegen 2.7.2a2 now on ANTLR site

[Micheal J]

> -----Original Message-----
> From: Kpako [mailto:kpako at yahoo.com]
> Sent: 18 July 2002 03:26
> To: antlr-interest at yahoogroups.com
> Subject: [antlr-interest] Re: Updated version of C# codegen 2.7.2a2 now
> on ANTLR site
>
>
> The following Lexer rule
>
> IDENT_OR_RULE_BEGIN
>     : (IDENT "::=") => RULE_BEGIN {$setType(RULE_BEGIN); }
>     | IDENT { $setType(IDENT); }
>     ;
>
> generates
>
> 	if ( synPredMatched30 )
> 		{
> 			mRULE_BEGIN(false);
> 			if (0==inputState.guessing)
> 			{
> 				_ttype = RULE_BEGIN;
> 			}
> 		}
>
>
> among others instead of
>
>
> 	if ( synPredMatched30 )
> 		{
> 			mRULE_BEGIN(false);
> 			if (0==inputState.guessing)
> 			{
> 				_ttype = FooTokenTypes.RULE_BEGIN;
> 			}
> 		}
>
>
> is this a bug or am I doing something wrong?

Thank you for the feedback on the C# code generator. This is actually a
documented (?) feature.  ;-)

You need to prefix the token name with the TokenTypes class name in the
"$setType" statement (as well as other references to tokens in the .g file).
This is due to differences in the way interface inheritance works in Java
and C#. In C# you have to specify the name of the class as a prefix.

Your example should read:

 IDENT_OR_RULE_BEGIN
     : (IDENT "::=") => RULE_BEGIN {$setType(FooTokenTypes.RULE_BEGIN); }
     | IDENT { $setType(FooTokenTypes.IDENT); }
     ;

Thanks,

Micheal


 

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