jelan.elan.instruction
Class Instruction

java.lang.Object
  extended by jelan.elan.GrammarElement
      extended by jelan.elan.instruction.Instruction
Direct Known Subclasses:
Assignment, Print, Repeat, StrictInstructionList

public abstract class Instruction
extends GrammarElement

Represents an instruction in the SLogo language


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
equals, 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.

Specified by:
evaluate in class GrammarElement
Parameters:
c - context in which the evaluation takes place
Returns:
the result of evaluating the construct