bprocessor-commit

[Michael L. <he...@us...>]

Update of /cvsroot/bprocessor/model/src/etc
In directory sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv28303/src/etc

Added Files:
	expression.g 
Log Message:
Added an expression grammar

--- NEW FILE: expression.g ---
header {
package net.sourceforge.bprocessor.model.parser;
}

class ExprLexer extends Lexer;

options {
    k=2; // needed for newline junk
    charVocabulary='\u0000'..'\u007F'; // allow ascii
}

LPAREN: '(' ;
RPAREN: ')' ;
PLUS  : '+' ;
MINUS : '-' ;
STAR  : '*' ;
INT   : ('0'..'9')+ ;
WS    : ( ' '
        | '\r' '\n'
        | '\n'
        | '\t'
        )
        {$setType(Token.SKIP);}
      ;

class ExprParser extends Parser;

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

mexpr      
    :   atom (STAR atom)*
    ;    

atom:   INT 
    |   LPAREN expr RPAREN 
    ;