org.nfunk.jep.function
Class Assign

java.lang.Object
  org.nfunk.jep.function.PostfixMathCommand
      org.nfunk.jep.function.Assign

All Implemented Interfaces:

PostfixMathCommandI, SpecialEvaluationI

Direct Known Subclasses:

MAssign, XAssign

public class Assign

extends PostfixMathCommand

implements SpecialEvaluationI

An assignment operator so we can do x=3+4. This function implements the SpecialEvaluationI interface so that it handles seting the value of a variable.

Author:

Rich Morris Created on 18-Nov-2003

Field Summary

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

curNumberOfParameters, numberOfParameters

Constructor Summary

Assign()

Method Summary

java.lang.Object

evaluate(Node node, java.lang.Object data, ParserVisitor pv, java.util.Stack inStack) For assignment set the value of the variable on the lhs to value returned by evaluating the righthand side.

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

checkStack, getNumberOfParameters, run, setCurNumberOfParameters

Methods inherited from class java.lang.Object

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

Constructor Detail

Assign

public Assign()

Method Detail

evaluate

public java.lang.Object evaluate(Node node,
                                 java.lang.Object data,
                                 ParserVisitor pv,
                                 java.util.Stack inStack)
                          throws ParseException

For assignment set the value of the variable on the lhs to value returned by evaluating the righthand side.

Specified by:

evaluate in interface SpecialEvaluationI

Parameters:

node - The current node

data - The data passed to visitor, typically not used

pv - The visitor, can be used evaluate the children

inStack - The stack of the evaluator

Returns:

the value after evaluation

Throws:

ParseException