[antlr-interest] Re: ANTLR 2.7.2 portability

[iank at bearcave.com]

> It's in the C++ docs as well.. at least in the ones in the repository this
> is documented.

  I confess that I did not RTFM.  I rebuilt my old example and it
  crashed on an uninitialized object (e.g., this == 0).  So I looked
  at the examples.

> >  However there seem to be grammar based problems as well (no grammar errors
> >  or warnings, but the grammer works differently now).  So the transition
> >  has not been as painless as I had hoped.  
> 
> Could you elaborate on this?

  The example I've tried to rebuild is from my simple expression
  parser.  This is on my web page

     http://www.bearcave.com/software/antlr/antlr_examples.html

  I have not updated the "main.C" with my new code that properly
  initializes the AST Factory, so the supporting C++ which prints the
  tree is out of date.  I'm using the default AST construction.  The
  grammar is shown below.  The parser processes the left hand side
  identifier, the assignment and then nothing else.  I'm note sure why
  this is.  As I note on the web page, this used to work.  If it is
  not something blazingly obvious, please don't spend time on this.
  After all, I have not read the recent documentation changes and one
  should RTFM before asking for help.

  Ian



options {
	language="Cpp";
}

class MyExprParser extends Parser;

options {
        k = 2;
        exportVocab=MyExpr;
	buildAST = true;
}


exprlist
  : ( assignment_statement )* EOF!
  ;

assignment_statement
  : assignment SEMICOLON!
  ;

assignment
  : (IDENT ASSIGN )? expr
  ;

primary_expr
  : IDENT 
  | constant 
  | (LPAREN! expr RPAREN! ) 
  ;

sign_expr
  : (MINUS)? primary_expr
  ;

mul_expr
  : sign_expr (( TIMES | DIVIDE | MOD ) sign_expr)*
  ;

expr
  : mul_expr (( PLUS | MINUS ) mul_expr)*
  ;


constant
  : (ICON | CHCON)
  ;



class MyExprLexer extends Lexer;

options {
	k = 2;
        exportVocab=MyExpr;
}


WS_     :       (' '
        |       '\t'
        |       '\n'
        |       '\r')
                { _ttype = Token::SKIP; }
        ;

IDENT
options {
	paraphrase = "identifier";
}
  :  ('a'..'z' | 'A'..'Z' | '_' ) ( ('a'..'z' | 'A'..'Z' | '_') |
('0'..'9' ))*
  ;

ICON
options {
	paraphrase = "integer constant";
}
  : '0'..'9' ('0'..'9')*
  ;

CHCON
options {
	paraphrase = "character constant";
}
  : "'" '\0'..'\255' "'"
  ;

COMMA
options {
	paraphrase = ",";
}
  : ','
  ;

SEMICOLON
options {
	paraphrase = ";";
}
  : ';'
  ;

LPAREN
options {
	paraphrase = "(";
}
  : '('
  ;

RPAREN
options {
	paraphrase = ")";
}
  : ')'
  ;

LCURL
options {
	paraphrase = "{";
}
  : '{'
  ;

RCURL
options {
	paraphrase = "}";
}
  : '}'
  ;

PLUS
options {
	paraphrase = "+";
}
  : '+'
  ;

MINUS
options {
	paraphrase = "-";
}
  : '-'
  ;

TIMES
options {
	paraphrase = "*";
}
  : '*'
  ;

DIVIDE
options {
	paraphrase = "/";
}
  : '/'
  ;

MOD
options {
	paraphrase = "%";
}
  : '%'
  ;

ASSIGN
options {
	paraphrase = "=";
}
  : '='
  ;



 

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/