hlt.language.util

Class RegExpOption

java.lang.Object

hlt.language.util.RegExp

hlt.language.util.RegExpOne

hlt.language.util.RegExpOption

public class RegExpOption
extends RegExpOne

This class is a concrete implementation of the abstract class RegExpOne to represent an optional regular expression (i.e., zero or one).

Version:

Last modified on Tue Jun 19 17:38:06 2012 by hak

Author:

Hassan Aït-Kaci

Copyright:

© Hassan Aït-Kaci

Field Summary

Fields inherited from class hlt.language.util.RegExp

BINARY_EXP, CHOICE_EXP, CONCAT_EXP, EMPTY, EMPTY_EXP, OPTION_EXP, PLUS_EXP, POWER_EXP, RANGE_EXP, STAR_EXP, SYMBOL_EXP, UNARY_EXP

Constructor Summary

Constructors

Constructor and Description
RegExpOption(RegExp arg) Constructs a RegExpOption with the specified RegExp.

Method Summary

Methods

Modifier and Type	Method and Description
RegExp	deepCopy() This returns a deep copy of this RegExp.
RegExp	normalize() This returns this RegExpOption's normal form according to the following rewrite rules: [OP:E] ()? → () [OP:O] X?? → X? [OP:P] X+? → X\* [OP:S] X\*? → X\* [OP:R0] X_0^n? → X_0^n * [OP:R1] X_1^n? → X_0^n *
RegExp	shallowCopy() This returns a shallow copy of this RegExp.
java.lang.String	toString() Returns a printable form for this RegExpOption.
int	type() This returns the specific type identifying this RegExp.

Methods inherited from class hlt.language.util.RegExpOne

equals, getArg, normalArg

Methods inherited from class hlt.language.util.RegExp

cleanup, isBinary, isChoice, isConcat, isEmpty, isLexLess, isOption, isPlus, isPower, isRange, isStar, isSymbol, isUnary, normEquals, noTrace, tag, toggleTrace, toNormalString, trace, tracing

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RegExpOption

public RegExpOption(RegExp arg)

Constructs a RegExpOption with the specified RegExp.

Method Detail

type

public final int type()

Description copied from class: RegExp

This returns the specific type identifying this RegExp.

Specified by:

type in class RegExp

shallowCopy

public final RegExp shallowCopy()

Description copied from class: RegExp

This returns a shallow copy of this RegExp.

Specified by:

shallowCopy in class RegExp

deepCopy

public final RegExp deepCopy()

Description copied from class: RegExp

This returns a deep copy of this RegExp.

Specified by:

deepCopy in class RegExp

normalize

public RegExp normalize()

This returns this RegExpOption's normal form according to the following rewrite rules:

1. [OP:E] ()? → ()
2. [OP:O] X?? → X?
3. [OP:P] X+? → X\*
4. [OP:S] X\*? → X\*
5. [OP:R0] X_0^n? → X_0^n *

[OP:R1] X_1^n? → X_0^n *

Specified by:

normalize in class RegExp

toString

public final java.lang.String toString()

Returns a printable form for this RegExpOption.

Overrides:

toString in class java.lang.Object