openjava.syntax
Class RestorableTokenSource

java.lang.Object
  |
  +--openjava.syntax.RestorableTokenSource

All Implemented Interfaces:

TokenSource

public class RestorableTokenSource

extends Object

implements TokenSource

A TokenSource which can be back-tracked.

Since:

%SOFTWARE% 1.0

Version:

1.0

Author:

Michiaki Tatsubori

See Also:

Object

Field Summary

private Environment	env
private int	offset
private int	pointer
private TokenSource	tokenSource

Constructor Summary

RestorableTokenSource(TokenSource src)

RestorableTokenSource(TokenSource src, Environment env)

Method Summary

void	assume()
void	fix()
Environment	getEnvironment()
Token	getNextToken()
Token	getToken(int i)
void	restore()

Methods inherited from class java.lang.Object

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

Field Detail

tokenSource

private TokenSource tokenSource

env

private Environment env

pointer

private int pointer

offset

private int offset

Constructor Detail

RestorableTokenSource

public RestorableTokenSource(TokenSource src,
                             Environment env)

RestorableTokenSource

public RestorableTokenSource(TokenSource src)

Method Detail

getEnvironment

public Environment getEnvironment()

Specified by:

getEnvironment in interface TokenSource

assume

public void assume()

restore

public void restore()

fix

public void fix()

getNextToken

public Token getNextToken()

Specified by:

getNextToken in interface TokenSource

getToken

public Token getToken(int i)

Specified by:

getToken in interface TokenSource