org.lsmp.djep.xjep
Class RewriteVisitor

java.lang.Object
  org.lsmp.djep.xjep.DoNothingVisitor
      org.lsmp.djep.xjep.RewriteVisitor

All Implemented Interfaces:

ParserVisitor

public class RewriteVisitor

extends DoNothingVisitor

Simplifies an expression. To use

 JEP j = ...; Node in = ...;
 SimplificationVisitor sv = new SimplificationVisitor(tu);
 Node out = sv.simplify(in);
 

Its intended to completly rewrite this class to that simplification rules can be specified by strings in a way similar to DiffRulesI. It also would be nice to change the rules depending on the type of arguments, for example matrix multiplication is not commutative. But some of the in built rules exploit commutativity.

Author:

Rich Morris Created on 20-Jun-2003

Constructor Summary

RewriteVisitor()

Method Summary

Node	rewrite(Node node, XJep xjep, RewriteRuleI[] rules, boolean simplify) must be implemented for subclasses.
java.lang.Object	visit(ASTFunNode node, java.lang.Object data)

Methods inherited from class org.lsmp.djep.xjep.DoNothingVisitor

acceptChildrenAsArray, visit, visit, visit, visit

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RewriteVisitor

public RewriteVisitor()

Method Detail

rewrite

public Node rewrite(Node node,
                    XJep xjep,
                    RewriteRuleI[] rules,
                    boolean simplify)
             throws ParseException,
                    java.lang.IllegalArgumentException

must be implemented for subclasses.

Throws:

ParseException

java.lang.IllegalArgumentException

visit

public java.lang.Object visit(ASTFunNode node,
                              java.lang.Object data)
                       throws ParseException

Specified by:

visit in interface ParserVisitor

Overrides:

visit in class DoNothingVisitor

Throws:

ParseException