elan.instruction
Class FuncVariable

java.lang.Object
  |
  +--elan.GrammarElement
        |
        +--elan.instruction.Instruction
              |
              +--elan.instruction.FuncVariable

All Implemented Interfaces:

java.lang.Comparable

public class FuncVariable

extends Instruction

implements java.lang.Comparable

A variable stores a value and can be used in an expression. Clients can create many objects representing a variable say "X", but each of these maps to the same object so that there is a common value for any occurrence of a named-variable

See Also:

VariableFactory

Field Summary

protected java.lang.String

myName

Fields inherited from class elan.GrammarElement

functionMap, ourMap

Constructor Summary

FuncVariable(java.lang.String s)

Method Summary

int	compareTo(java.lang.Object o)
boolean	equals(java.lang.Object o)
java.lang.Object	evaluate(Context c) Evaluate this language construct in some context.
java.lang.String	toString()
StrictInstructionList	value(Context c)

Methods inherited from class java.lang.Object

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

Field Detail

myName

protected java.lang.String myName

Constructor Detail

FuncVariable

public FuncVariable(java.lang.String s)

Method Detail

evaluate

public java.lang.Object evaluate(Context c)

Description copied from class: GrammarElement

Evaluate this language construct in some context. The evaluation may have side-effects, e.g., moving a turtle.

Overrides:

evaluate in class Instruction

Following copied from class: elan.GrammarElement

Parameters:

is - the context in which the evaluation takes place

Returns:

the result of evaluating the construct

value

public StrictInstructionList value(Context c)

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

compareTo

public int compareTo(java.lang.Object o)

Specified by:

compareTo in interface java.lang.Comparable

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object