slogo

Interface Context

All Known Implementing Classes:

ContextImpl, TurtleField, VariableFactory

public interface Context

Context is a hook for implementing language features that require an environment for evaluation. For example, in parsing SLogo you might need to update a Turtle model, or use a Graphics object to display information. These objects can be made accessible via the Context class so that an slogo.instruction.Instruction can execute and modify/access the Context as appropriate.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	value(java.lang.String name) If there are local/global variables, a variable might have a different value depending on the Context, so Contexts should support determining the value of an identifier.

Method Detail

value

java.lang.Object value(java.lang.String name)

If there are local/global variables, a variable might have a different value depending on the Context, so Contexts should support determining the value of an identifier.

Parameters:

name - identifier being evaluated in this Context

Returns:

the object mapped to by the identifier in this Context AKA return the object that the identifier maps to in this context