gi
Class Lexicon.PosixClass

java.lang.Object
  |
  +--gi.Lexicon.Expression
        |
        +--gi.Lexicon.Alphabet
              |
              +--gi.Lexicon.PosixClass

Enclosing class:

Lexicon

protected static class Lexicon.PosixClass

extends Lexicon.Alphabet

This class implements an Expression denoting the set of characters in a POSIX class.

Version:

1.0

Author:

© 1999-2000 Craig A. Rich <carich@acm.org>

Field Summary

(package private) Integer	accept The accept state of the NFA recognizing the language denoted by this Expression.
(package private) Integer	initial The initial state of the NFA recognizing the language denoted by this Expression.
private int	posixclass The POSIX class whose set is denoted.

Constructor Summary

private

Lexicon.PosixClass(int posixclass) Constructs an Expression denoting the set of characters in a POSIX class.

Method Summary

static Lexicon.Expression	alnum() Creates an Expression denoting the set of alphanumeric characters.
static Lexicon.Expression	alpha() Creates an Expression denoting the set of alphabetic characters.
static Lexicon.Expression	blank() Creates an Expression denoting the set of blank characters.
static Lexicon.Expression	cntrl() Creates an Expression denoting the set of control characters.
(package private) boolean	contains(char c) Indicates whether a character is in the set denoted by this Expression.
(package private) Lexicon.Expression	copy() Creates a copy of this Expression.
static Lexicon.Expression	digit() Creates an Expression denoting the set of decimal digit characters.
static Lexicon.Expression	graph() Creates an Expression denoting the set of graphical characters.
static Lexicon.Expression	lower() Creates an Expression denoting the set of lowercase alphabetic characters.
static Lexicon.Expression	print() Creates an Expression denoting the set of printable characters.
static Lexicon.Expression	punct() Creates an Expression denoting the set of punctuation characters.
static Lexicon.Expression	space() Creates an Expression denoting the set of space characters.
static Lexicon.Expression	upper() Creates an Expression denoting the set of uppercase alphabetic characters.
static Lexicon.Expression	xdigit() Creates an Expression denoting the set of hexadecimal digit characters.

Methods inherited from class java.lang.Object

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

Field Detail

posixclass

private final int posixclass

The POSIX class whose set is denoted.

accept

Integer accept

The accept state of the NFA recognizing the language denoted by this Expression.

initial

Integer initial

The initial state of the NFA recognizing the language denoted by this Expression.

Constructor Detail

Lexicon.PosixClass

private Lexicon.PosixClass(int posixclass)

Constructs an Expression denoting the set of characters in a POSIX class. An NFA recognizing the language denoted by this Expression is constructed.

Method Detail

alnum

public static Lexicon.Expression alnum()

Creates an Expression denoting the set of alphanumeric characters.

alpha

public static Lexicon.Expression alpha()

Creates an Expression denoting the set of alphabetic characters.

blank

public static Lexicon.Expression blank()

Creates an Expression denoting the set of blank characters.

cntrl

public static Lexicon.Expression cntrl()

Creates an Expression denoting the set of control characters.

contains

boolean contains(char c)

Indicates whether a character is in the set denoted by this Expression.

Specified by:

contains in class Lexicon.Alphabet

Parameters:

c - the character whose status is requested.

Returns:

true if c is in this PosixClass; false otherwise.

copy

Lexicon.Expression copy()

Creates a copy of this Expression. The NFA recognizing the language denoted by this Expression is replicated.

Specified by:

copy in class Lexicon.Expression

Returns:

a copy of this Expression.

digit

public static Lexicon.Expression digit()

Creates an Expression denoting the set of decimal digit characters.

graph

public static Lexicon.Expression graph()

Creates an Expression denoting the set of graphical characters.

lower

public static Lexicon.Expression lower()

Creates an Expression denoting the set of lowercase alphabetic characters.

print

public static Lexicon.Expression print()

Creates an Expression denoting the set of printable characters.

punct

public static Lexicon.Expression punct()

Creates an Expression denoting the set of punctuation characters.

space

public static Lexicon.Expression space()

Creates an Expression denoting the set of space characters.

upper

public static Lexicon.Expression upper()

Creates an Expression denoting the set of uppercase alphabetic characters.

xdigit

public static Lexicon.Expression xdigit()

Creates an Expression denoting the set of hexadecimal digit characters.