org.javacc.parser

Class Expansion

java.lang.Object

org.javacc.parser.Expansion

Direct Known Subclasses:

Action, Choice, Lookahead, NonTerminal, OneOrMore, RegularExpression, Sequence, TryBlock, ZeroOrMore, ZeroOrOne

public class Expansion
extends java.lang.Object

Describes expansions - entities that may occur on the right hand sides of productions. This is the base class of a bunch of other more specific classes.

Field Summary

Fields

Modifier and Type	Field and Description
protected static java.lang.String	eol
boolean	inMinimumSize This flag is used for bookkeeping by the minimumSize method in class ParseEngine.
long	myGeneration
static long	nextGenerationIndex To avoid right-recursive loops when calculating follow sets, we use a generation number which indicates if this expansion was visited by LookaheadWalk.genFollowSet in the same generation.
java.lang.Object	parent The parent of this expansion node.

Constructor Summary

Constructors

Constructor and Description
Expansion()

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.StringBuffer	dump(int indent, java.util.Set<? super Expansion> alreadyDumped)
protected java.lang.StringBuffer	dumpPrefix(int indent)
int	hashCode() A reimplementing of Object.hashCode() to be deterministic.
static void	reInit()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

parent

public java.lang.Object parent

The parent of this expansion node. In case this is the top level expansion of the production it is a reference to the production node otherwise it is a reference to another Expansion node. In case this is the top level of a lookahead expansion,then the parent is null.

nextGenerationIndex

public static long nextGenerationIndex

To avoid right-recursive loops when calculating follow sets, we use a generation number which indicates if this expansion was visited by LookaheadWalk.genFollowSet in the same generation. New generations are obtained by incrementing the static counter below, and the current generation is stored in the non-static variable below.

myGeneration

public long myGeneration

inMinimumSize

public boolean inMinimumSize

This flag is used for bookkeeping by the minimumSize method in class ParseEngine.

eol

protected static final java.lang.String eol

Constructor Detail

Expansion

public Expansion()

Method Detail

hashCode

public int hashCode()

A reimplementing of Object.hashCode() to be deterministic. This uses the line and column fields to generate an arbitrary number - we assume that this method is called only after line and column are set to their actual values.

Overrides:

hashCode in class java.lang.Object

reInit

public static void reInit()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

dumpPrefix

protected java.lang.StringBuffer dumpPrefix(int indent)

dump

public java.lang.StringBuffer dump(int indent,
                          java.util.Set<? super Expansion> alreadyDumped)