[antlr-interest] Re : help please
Molka Tounsi
tounsimolka at yahoo.fr
Wed Apr 21 03:11:58 PDT 2010
Thanks! It is true I use ANTLRWorks v3.
Now I have try an other grammar, all is well, without when I makes the debugger it shows me:
"cannot launch the debugger.
Time-out waiting to connect to the remote parser"
Or sometimes it shows me:
"Compiler exception:
java.io.IOException: Cannot run program"javac": CreateProcess errors=2, Le fichier spécifié est introuvable"
What is the wrong??
An other question please , when I use ANTLRWorks it is necessary to install ANTLR and how? Just add ANTLR.jar in Classpath?
Thanks for your help.
________________________________
De : John B. Brodie <jbb at acm.org>
À : Molka Tounsi <tounsimolka at yahoo.fr>
Cc : antlr-interest <antlr-interest at antlr.org>
Envoyé le : Mar 20 avril 2010, 16 h 59 min 36 s
Objet : Re: [antlr-interest] help please
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...
More information about the antlr-interest
mailing list