org.antlr.analysis
Class LookaheadSet

java.lang.Object
  org.antlr.analysis.LookaheadSet

public class LookaheadSet
extends Object

An LL(1) lookahead set; contains a set of token types and a "hasEOF" condition when the set contains EOF. Since EOF is -1 everywhere and -1 cannot be stored in my BitSet, I set a condition here. There may be other reasons in the future to abstract a LookaheadSet over a raw BitSet.

Field Summary

IntervalSet

tokenTypeSet

Constructor Summary

LookaheadSet()

LookaheadSet(int atom)

LookaheadSet(IntSet s)

LookaheadSet(LookaheadSet other)

Method Summary

boolean	equals(Object other)
int	hashCode()
LookaheadSet	intersection(LookaheadSet s)
boolean	isNil()
boolean	member(int a)
LookaheadSet	or(LookaheadSet other)
void	orInPlace(LookaheadSet other)
void	remove(int a)
LookaheadSet	subtract(LookaheadSet other)
String	toString()
String	toString(Grammar g)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

tokenTypeSet

public IntervalSet tokenTypeSet

Constructor Detail

LookaheadSet

public LookaheadSet()

LookaheadSet

public LookaheadSet(IntSet s)

LookaheadSet

public LookaheadSet(int atom)

LookaheadSet

public LookaheadSet(LookaheadSet other)

Method Detail

orInPlace

public void orInPlace(LookaheadSet other)

or

public LookaheadSet or(LookaheadSet other)

subtract

public LookaheadSet subtract(LookaheadSet other)

member

public boolean member(int a)

intersection

public LookaheadSet intersection(LookaheadSet s)

isNil

public boolean isNil()

remove

public void remove(int a)

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object other)

Overrides:

equals in class Object

toString

public String toString(Grammar g)

toString

public String toString()

Overrides:

toString in class Object