antlr
Class Lookahead

java.lang.Object
  |
  +--antlr.Lookahead

All Implemented Interfaces:

Cloneable

public class Lookahead

extends Object

implements Cloneable

Untamed:

Field Summary

(package private) String	cycle is this computation part of a computation cycle?
(package private) BitSet	epsilonDepth What k values were being computed when end of rule hit?
(package private) BitSet	fset actual bitset of the lookahead
(package private) boolean	hasEpsilon Does this lookahead depth include Epsilon token type? This is used to avoid having a bit in the set for Epsilon as it conflicts with parsing binary files.

Constructor Summary

Lookahead()
Enabled:

Lookahead(BitSet p)
Enabled: create a new lookahead set with the LL(1) set to the parameter

Lookahead(String c)
Enabled: create an empty lookahead set, but with cycle

Method Summary

Object	clone() Suppressed: Make a deep copy of everything in this object
void	combineWith(Lookahead q) Enabled:
boolean	containsEpsilon() Enabled:
Lookahead	intersection(Lookahead q) Enabled: What is the intersection of two lookahead depths? Only the Epsilon "bit" and bitset are considered.
boolean	nil() Enabled:
static Lookahead	of(int el) Enabled:
void	resetEpsilon() Enabled:
void	setEpsilon() Enabled:
String	toString() Suppressed:
String	toString(String separator, CharFormatter formatter) Enabled:
String	toString(String separator, CharFormatter formatter, Grammar g) Enabled:
String	toString(String separator, Vector vocab) Enabled:

Methods inherited from class java.lang.Object

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

Field Detail

fset

BitSet fset

actual bitset of the lookahead

cycle

String cycle

is this computation part of a computation cycle?

epsilonDepth

BitSet epsilonDepth

What k values were being computed when end of rule hit?

hasEpsilon

boolean hasEpsilon

Does this lookahead depth include Epsilon token type? This is used to avoid having a bit in the set for Epsilon as it conflicts with parsing binary files.

Constructor Detail

Lookahead

public Lookahead()

Enabled:

Lookahead

public Lookahead(BitSet p)

Enabled: create a new lookahead set with the LL(1) set to the parameter

Lookahead

public Lookahead(String c)

Enabled: create an empty lookahead set, but with cycle

Method Detail

clone

public Object clone()

Suppressed: Make a deep copy of everything in this object

Overrides:

clone in class Object

Returns:

a clone of this instance.

See Also:

java.lang.Cloneable

combineWith

public void combineWith(Lookahead q)

Enabled:

containsEpsilon

public boolean containsEpsilon()

Enabled:

intersection

public Lookahead intersection(Lookahead q)

Enabled: What is the intersection of two lookahead depths? Only the Epsilon "bit" and bitset are considered.

nil

public boolean nil()

Enabled:

of

public static Lookahead of(int el)

Enabled:

resetEpsilon

public void resetEpsilon()

Enabled:

setEpsilon

public void setEpsilon()

Enabled:

toString

public String toString()

Suppressed:

Overrides:

toString in class Object

Returns:

a string representation of the object.

toString

public String toString(String separator,
                       CharFormatter formatter)

Enabled:

toString

public String toString(String separator,
                       CharFormatter formatter,
                       Grammar g)

Enabled:

toString

public String toString(String separator,
                       Vector vocab)

Enabled: