Class RegularExpression

java.lang.Object

org.javacc.parser.Expansion

org.javacc.parser.RegularExpression

Direct Known Subclasses:

RCharacterList, RChoice, REndOfFile, RJustName, ROneOrMore, RRepetitionRange, RSequence, RStringLiteral, RZeroOrMore, RZeroOrOne

public abstract class RegularExpression
extends Expansion

Describes regular expressions.

Field Summary

Fields

Modifier and Type	Field	Description
String	label	The label of the regular expression (if any).
List<Token>	lhsTokens	The LHS to which the token value of the regular expression is assigned.
int	ordinal	The ordinal value assigned to the regular expression.
boolean	private_rexp	This flag is set if the regular expression has a label prefixed with the # symbol - this indicates that the purpose of the regular expression is solely for defining other regular expressions.
Token	rhsToken	We now allow qualified access to token members.
TokenProduction	tpContext	If this is a top-level regular expression (nested directly within a TokenProduction), then this field point to that TokenProduction object.
(package private) int	walkStatus	The following variable is used to maintain state information for the loop determination algorithm: It is initialized to 0, and set to -1 if this node has been visited in a pre-order walk, and then it is set to 1 if the pre-order walk of the whole graph from this node has been traversed.

Fields inherited from class Expansion

eol, inMinimumSize, myGeneration, parent

Constructor Summary

Constructors

Constructor	Description
RegularExpression()

Method Summary

Modifier and Type	Method	Description
boolean	CanMatchAnyChar()
StringBuffer	dump(int indent, Set<Expansion> alreadyDumped)
abstract Nfa	GenerateNfa(boolean ignoreCase, LexerContext lexerContext)

Methods inherited from class Expansion

dumpPrefix, getColumn, getLine, getProductionName, hashCode, setColumn, setLine, toString

Methods inherited from class Object

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

Field Details

label

public String label

The label of the regular expression (if any). If no label is present, this is set to "".

ordinal

public int ordinal

The ordinal value assigned to the regular expression. It is used for internal processing and passing information between the parser and the lexical analyzer.

lhsTokens

public List<Token> lhsTokens

The LHS to which the token value of the regular expression is assigned. In case there is no LHS, then the list remains empty.

rhsToken

public Token rhsToken

We now allow qualified access to token members. Store it here.

private_rexp

public boolean private_rexp

This flag is set if the regular expression has a label prefixed with the # symbol - this indicates that the purpose of the regular expression is solely for defining other regular expressions.

tpContext

public TokenProduction tpContext

If this is a top-level regular expression (nested directly within a TokenProduction), then this field point to that TokenProduction object.

walkStatus

int walkStatus

The following variable is used to maintain state information for the loop determination algorithm: It is initialized to 0, and set to -1 if this node has been visited in a pre-order walk, and then it is set to 1 if the pre-order walk of the whole graph from this node has been traversed. i.e., -1 indicates partially processed, and 1 indicates fully processed.

Constructor Details

RegularExpression

public RegularExpression()

Method Details

GenerateNfa

public abstract Nfa GenerateNfa(boolean ignoreCase,
 LexerContext lexerContext)

CanMatchAnyChar

public boolean CanMatchAnyChar()

dump

public StringBuffer dump(int indent,
 Set<Expansion> alreadyDumped)

Overrides:

dump in class Expansion