elan.instruction
Class Instruction

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

Direct Known Subclasses:

Add, Assignment, Back, Clean, Clearscreen, Fence, Forward, FuncVariable, Hideturtle, Home, If, Jump, Left, Pendown, Penup, Print, Repeat, Right, Setbackground, Setbg, Seth, Setheading, Setpalette, Setpc, Setpencolor, Setpensize, Setps, Setsh, Setshape, Setx, Setxy, Sety, Showturtle, StrictInstructionList, Tell, To, Window, Wrap

public class Instruction

extends GrammarElement

Fields inherited from class elan.GrammarElement

functionMap, ourMap

Constructor Summary

Instruction()

Method Summary

java.lang.Object

evaluate(Context c) Evaluate this language construct in some context.

Methods inherited from class java.lang.Object

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

Constructor Detail

Instruction

public Instruction()

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 GrammarElement

Following copied from class: elan.GrammarElement

Parameters:

is - the context in which the evaluation takes place

Returns:

the result of evaluating the construct