bprocessor-commit

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

Update of /cvsroot/bprocessor/bscript/src/etc
In directory sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv1549/src/etc

Added Files:
	bscript.g 
Log Message:
Base version

--- NEW FILE: bscript.g ---
header {
package net.sourceforge.bprocessor.model.parser;
import net.sourceforge.bprocessor.model.evaluator.*;
}

class ScriptLexer extends Lexer;

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

StartTerm: '(' ;
EndTerm: ')' ;

Plus  : '+' ;
Minus : '-' ;
Multiply  : '*' ;
Divide : '/'  ;
Period : '.' ;
End   : ';' ;


protected Letter
  : Upper | Lower
  ;
  
protected Upper
  : 'A' .. 'Z'
  ;
  
protected Lower
  : 'a' .. 'z'
  ;
  
protected Digit : '0'..'9' ;

protected Integer   : (Digit)+ ;
protected Real : Integer Period Integer ;
Number : (Integer Period Integer) => Real | ( Integer )  => Integer ;

Identifier
  : (Letter | '_' ) ( Letter | Digit | '_' )*
  ;
  
  

WhiteSpace
   : ( ' '
   | '\r' '\n'
   | '\n'
   | '\t'
     )
     {$setType(Token.SKIP);}
   ;

class ScriptParser extends Parser;



program[Function env]
       : expression[env] End
       ;
expression[Function env]
    : term[env]
      ( Plus term[env] { env.append(new Primitive(Primitive.ADD)); } 
      | Minus term[env] { env.append(new Primitive(Primitive.SUB)); }
      )*
    ;

term[Function env]
    : atom[env]
    ( Multiply atom[env] { env.append(new Primitive(Primitive.MUL)); } 
    | Divide atom[env] {  env.append(new Primitive(Primitive.DIV)); }
    )*
    ;

atom[Function env]
    :   literal[env]
    |   variable[env]
    |   StartTerm expression[env] EndTerm
    |   unary[env]
    ;

unary[Function env]
    : Plus atom[env]
    | Minus atom[env] { env.append(new Primitive(Primitive.NEG)); } 
    ;
    
literal[Function env]
    : n:Number { env.append(new Literal(new Double(n.getText()))); }
    ;

variable[Function env]
    : i:Identifier { env.append(new Variable(i.getText())); }
    ;