slogo

Interface Context

All Known Implementing Classes:

TurtleContext

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.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	MAIN_TURTLE_NAME

Method Summary

Methods

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 (this method may be superfluous).

Field Detail

MAIN_TURTLE_NAME

static final java.lang.String MAIN_TURTLE_NAME

See Also:

Constant Field Values

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 (this method may be superfluous).

Parameters:

name - identifier being evaluated in this Context

Returns:

the value of the identifier in this Context