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"
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COPYRIGHT (c) 2011 by eXept Software AG
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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"{ Package: 'stx:libbasic2' }"
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Collection subclass:#CharacterSet
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instanceVariableNames:'bits'
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classVariableNames:''
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poolDictionaries:''
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category:'Collections-Unordered'
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!
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!CharacterSet class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 2011 by eXept Software AG
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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!
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documentation
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"
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Used to represent 8-bit character sets (for now) as a bitmap.
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Bit[n] is set, if Character codePoint:(n-1) is included in the set.
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[author:]
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Claus Gittinger
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"
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! !
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!CharacterSet class methodsFor:'instance creation'!
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new
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^ self basicNew initialize
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"Created: / 28-01-2011 / 17:29:24 / cg"
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! !
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!CharacterSet methodsFor:'accessing'!
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byteArrayMap
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^bits
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! !
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!CharacterSet methodsFor:'adding & removing'!
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add:aCharacter
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"add aCharacter to the collection.
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Returns aCharacter (sigh)"
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|cp byteIndex bitIndex|
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cp := aCharacter codePoint.
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self assert:(cp <= 255).
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byteIndex := (cp // 8) + 1.
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bitIndex := (cp \\ 8) + 1.
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byteIndex > bits size ifTrue:[
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bits := (ByteArray new:byteIndex) replaceFrom:1 with:bits.
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].
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bits at:byteIndex put:((bits at:byteIndex) setBit:bitIndex).
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^ aCharacter "/ sigh
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"Created: / 28-01-2011 / 17:44:21 / cg"
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!
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includes:aCharacter
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"Return true if the set contains aCharacter"
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|cp byteIndex bitIndex|
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cp := aCharacter codePoint.
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(cp > 255) ifTrue:[^ false].
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byteIndex := (cp // 8) + 1.
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bitIndex := (cp \\ 8) + 1.
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byteIndex > bits size ifTrue:[^ false].
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^ ((bits at:byteIndex) bitAt:bitIndex) ~~ 0
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!
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remove:aCharacter ifAbsent:exceptionValue
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|cp byteIndex bitIndex mask|
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cp := aCharacter codePoint.
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self assert:(cp <= 255).
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byteIndex := (cp // 8) + 1.
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bitIndex := (cp \\ 8) + 1.
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byteIndex <= bits size ifTrue:[
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((mask := bits at:byteIndex) isBitSet:bitIndex) ifTrue:[
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bits at:byteIndex put:(mask clearBit:bitIndex).
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^ aCharacter
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].
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].
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^ exceptionValue value
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"Created: / 28-01-2011 / 17:51:22 / cg"
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! !
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!CharacterSet methodsFor:'comparing'!
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= something
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^ (self species = something species)
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and:[ bits = something byteArrayMap ]
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!
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hash
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^ bits hash
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! !
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!CharacterSet methodsFor:'copying'!
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postCopy
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bits := bits copy
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! !
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!CharacterSet methodsFor:'initialization'!
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initialize
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bits := nil "/ empty
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"Created: / 28-01-2011 / 17:29:48 / cg"
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! !
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!CharacterSet methodsFor:'queries'!
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do:aBlock
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|cp|
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cp := 0.
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bits notNil ifTrue:[
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bits do:[:eachByte |
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eachByte ~~ 0 ifTrue:[
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#(1 2 4 8 16 32 64 128) do:[:mask |
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(eachByte bitTest:mask) ifTrue:[
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aBlock value:(Character codePoint:cp).
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].
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cp := cp + 1.
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].
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] ifFalse:[
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cp := cp + 8.
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].
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]
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].
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"Created: / 28-01-2011 / 17:39:16 / cg"
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!
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size
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|n|
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bits isNil ifTrue:[^ 0].
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n := 0.
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bits do:[:eachByte |
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n := n + (eachByte bitCount)
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].
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^ n
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"Created: / 28-01-2011 / 17:35:21 / cg"
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! !
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!CharacterSet class methodsFor:'documentation'!
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version_CVS
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^ '$Header: /cvs/stx/stx/libbasic2/CharacterSet.st,v 1.3 2014-12-24 11:36:29 cg Exp $'
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! !
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