[antlr-interest] antlr v3 grammar inheritance

[Austin Hastings]

Are you using the "tokenVocab" option to force the two parsers to share 
a common token numbering scheme?


=Austin

Mihai Gheorghe wrote:
> Using ANTLR v3.0.1,
> I'm trying to inherit rules from one grammar to another, like this:
>
> //========================Start file Base.g3=========================
> grammar Base;
>
> baseRule
>     : F1
>     | F2
>     | F3
>     | F4
>     ;
>
> F1
>     : 'F1'
>     ;
> F2
>     : 'F2'
>     ;
> F3
>     : 'F3'
>     ;
> F4
>     : 'F4'
>     ;
>
> f5
>     : 'Something'
>     ;
>    
> WS  :  (' '|'\r'|'\t'|'\u000C'|'\n') {$channel=HIDDEN;}
>     ;
> //========================End file Base.g3=========================
>
> //========================Start file Extended.g3=========================
> grammar Extended;
>
> options {
>  superClass=BaseParser;
> }
>  
>
> compilationUnit
>     : func1N
>     | ABC
>     ;
>
> func1N
>     : g1
>     ;
>
> g1
>     : F1
>     | F2
>     ;
>
> g2
>     : F3
>     | F4
>     ;
>
> ABC
>     : 'ABC'
>     ;
>
> WS  :  (' '|'\r'|'\t'|'\u000C'|'\n') {$channel=HIDDEN;}
>     ;
> //========================End file Extended.g3=========================
>    
>
> but ANTLR doesn't recognize rules defined in Base when called from 
> Extended
>
> I've checked the documentation but found no examples. Instead I got:
>
> http://www.antlr.org/wiki/display/ANTLR3/inheritance+or+some+other+grammar+sharing+mechanism
> http://www.antlr.org/wiki/display/ANTLR3/add+superClass+to+lexer
>
> Are these IMPLEMENTED in ANTLR v3.0.1?
>
> Does anybody solved the problem of grammar inheritance in v3?
>
> -- 
> Best regards,
> Mihai
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