slogo

Interface Context

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.

Author:

Owen Astrachan

Method Summary

Modifier and Type	Method and Description
double	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 (this method may be superfluous).

Method Detail

value

double 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 (this method may be superfluous).

Parameters:

name - identifier being evaluated in this Context

Returns:

the value of the identifier in this Context