jsint
Class LocalVariable

java.lang.Object
  |
  +--jsint.LocalVariable

All Implemented Interfaces:

java.io.Serializable

public class LocalVariable

extends java.lang.Object

implements java.io.Serializable

A LocalVariable is denoted by its position in the environment, in terms of the number of levels "up" we have to go (number of nested environments), the number of variables "in" we have to go (ordinal position of variable), and whether the variable is a "rest" (or "dotted") variable. Example of variables in (list x y z a b): (lambda (x y) x.up=2, x.in=0 y.up=2, y.in=1 (lambda (z . a) z.up=1, z.in=0 a.up=1, a.in=1 (lambda b b.up=0, b.in=0 (list x y z a b))))

Author:

Peter Norvig, Copyright 1998, peter@norvig.com, license subsequently modified by Jscheme project members licensed under zlib licence (see license.txt)

See Also:

Serialized Form

Field Summary

int	in The ordinal position in the environment where the variable is.
int	up The number of levels up in the parent chain where the variable is.

Constructor Summary

LocalVariable(int up, int in, Symbol name)
Create a new variable.

Method Summary

java.lang.String

toString() Use the name, up and in of the variable as its String representation so they distinguish themselves from a Global variable.

Methods inherited from class java.lang.Object

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

Field Detail

up

public int up

The number of levels up in the parent chain where the variable is.

in

public int in

The ordinal position in the environment where the variable is.

Constructor Detail

LocalVariable

public LocalVariable(int up,
                     int in,
                     Symbol name)

Create a new variable.

Method Detail

toString

public java.lang.String toString()

Use the name, up and in of the variable as its String representation so they distinguish themselves from a Global variable.

Overrides:

toString in class java.lang.Object