[antlr-interest] Newbie : help please

[Alexey Demakov]

Rule 'atom' referenced in ExprTreeParser should be defined in tree parser, not only in ExprParser.

Regards,
Alexey

-----
Alexey Demakov
TreeDL: Tree Description Language: http://treedl.sourceforge.net
RedVerst Group: http://www.unitesk.com

  ----- Original Message ----- 
  From: Xavier Benveniste 
  To: antlr-interest at antlr.org 
  Sent: Monday, July 25, 2005 2:52 PM
  Subject: [antlr-interest] Newbie : help please


  Hi,

  can someone tell me what is wrong with this vers simple grammar  ? ( error is : "Rule 'atom' is not defined") Thanks.

  class ExprParser extends Parser;

  options {

  buildAST = true;

  defaultErrorHandler = false;

  }

  atom: INT

  ;

  class ExprLexer extends Lexer;

  options {

  k = 2; // two characters of lookahead

  testLiterals = false; // don't automatically test for literals

  charVocabulary = '\u0003'..'\uFFFF'; // allow UNICODE

  }

  /* Integers */

  INT : ('0'..'9')+ ;

  /* Comparison operators */

  EQUALS : "==";

  NOT_EQUALS : "<>";

  GT : ">";

  GTE : ">=";

  LT : "<";

  LTE : "<=";


  class ExprTreeParser extends TreeParser;

  options {

  importVocab=ExprParser;

  }

  expr returns [boolean r=false]

  { int a,b; }

  : #(EQUALS a=atom b=atom) {r = (a == b);}

  | #(NOT_EQUALS a=atom b=atom) {r = (a != b);} 

  | #(GT a=atom b=atom) {r = (a > b);}

  | #(GTE a=atom b=atom) {r = (a >= b);}

  | #(LT a=atom b=atom) {r = (a < b);}

  | #(LTE a=atom b=atom) {r = (a <= b);}

  ;
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