org.lsmp.djep.xjep.function

Class Define

java.lang.Object

org.nfunk.jep.function.PostfixMathCommand

org.lsmp.djep.xjep.function.Define

All Implemented Interfaces:

CommandVisitorI, PostfixMathCommandI

public class Define
extends PostfixMathCommand
implements CommandVisitorI

Allows functions to be defined in equations.

 XJep > Define("half",1,"x/2")
 XJep > half(5)
 

Currently the Define function is handled in the preprocessing step

 Node n = xj.parse("Define(\"sumToX\",1,\"x*(x+1)/2\")");
 Node preproc = xj.preprocess(n);
 

and preproc will be null if a Define statement is encountered. This is probably a bug. TODO improve syntax. So can have Define("half(x)",x/2) TODO work out how to simplify and evaluate Define statements which don't really have a value. TODO fix parser so can do half(x) = x/2

Author:

Rich Morris Created on 21-Jul-2005

Field Summary

Fields inherited from class org.nfunk.jep.function.PostfixMathCommand

curNumberOfParameters, numberOfParameters

Constructor Summary

Constructors

Constructor and Description
Define(XJep xj)

Method Summary

Modifier and Type	Method and Description
Node	process(Node node, Node[] children, XJep xjep) Performs the specified action on an expression tree.

Methods inherited from class org.nfunk.jep.function.PostfixMathCommand

checkNumberOfParameters, checkStack, getNumberOfParameters, run, setCurNumberOfParameters

Methods inherited from class java.lang.Object

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

Constructor Detail

Define

public Define(XJep xj)

Method Detail

process

public Node process(Node node,
                    Node[] children,
                    XJep xjep)
             throws ParseException

Description copied from interface: CommandVisitorI

Performs the specified action on an expression tree.

Specified by:

process in interface CommandVisitorI

Parameters:

node - top node of the tree

children - the children of the node after they have been preprocessed.

xjep - a reference to the current XJep interface.

Returns:

top node of the results.

Throws:

ParseException - exception