Greetings!
On Tue, 2010-04-20 at 14:37 +0000, Molka Tounsi wrote:
> I tried this example on ANTLRWORK but it shows me errors.
> This is the code:
> class CalcParser extends Parser;
> options {
> buildAST = true; // uses CommonAST by default
> }
>
> expr
> : mexpr (PLUS^ mexpr)* SEMI!
> ;
>
> mexpr
> : atom (STAR^ atom)*
> ;
>
> atom: INT
> ;
>
> class CalcLexer extends Lexer;
>
> WS : (' '
> | '\t'
> | '\n'
> | '\r')
> { _ttype = Token.SKIP; }
> ;
>
> LPAREN: '('
> ;
>
> RPAREN: ')'
> ;
>
> STAR: '*'
> ;
>
> PLUS: '+'
> ;
>
> SEMI: ';'
> ;
>
> protected
> DIGIT
> : '0'..'9'
> ;
>
> INT : (DIGIT)+
> ;
>
> class CalcTreeWalker extends TreeParser;
>
> expr returns [float r]
> {
> float a,b;
> r=0;
> }
> : #(PLUS a=expr b=expr) {r = a+b;}
> | #(STAR a=expr b=expr) {r = a*b;}
> | i:INT {r =
> (float)Integer.parseInt(i.getText());}
> ;
>
> can you help me please ???
>
This looks like an ANTLR version 2 grammar.
Are you sure you are using an older (e.g. v2) ANTLRWorks and not a
newwer v3 oriented ANTLRWorks?
You might consider moving up to ANTLR version 3...
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