1104
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"
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COPYRIGHT (c) 1992 by Claus Gittinger
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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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1244
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"{ Package: 'stx:libbasic2' }"
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1104
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SequenceableCollection subclass:#NumberSet
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292
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instanceVariableNames:'intervals'
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classVariableNames:''
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poolDictionaries:''
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category:'Collections-Ordered'
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!
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95
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!NumberSet class methodsFor:'documentation'!
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1104
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copyright
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"
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COPYRIGHT (c) 1992 by Claus Gittinger
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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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95
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documentation
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"
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NumberSets are Sets holding positive integers.
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483
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1244
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This class has been written to represent number-ranges from .newsrc-files,
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and it supports reading/writing of that format.
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The implementation uses an array of intervals or numbers.
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95
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Reading and writing is done in .newsrc-format.
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written spring 92 by claus
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[author:]
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Claus Gittinger
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[see also:]
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NewsHandler
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95
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"
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! !
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16
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!NumberSet class methodsFor:'instance creation'!
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with:aNumberOrInterval
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"return a new numberSet containing a single number
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or the numbers from an interval"
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^ self new setFirst:aNumberOrInterval
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"
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NumberSet with:69
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NumberSet with:(1 to:50)
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"
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"Modified: 9.5.1996 / 17:25:18 / cg"
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! !
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!NumberSet class methodsFor:'input from a stream'!
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readFrom:aStringOrStream
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"read a NumberSet (in .newsrc format) from aStream.
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return an empty NumberSet if nothing can be read (or wrong format)"
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^ self new readFrom:aStringOrStream
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"
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NumberSet readFrom:(ReadStream on:'0-62,69,82,84,86,88,91').
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"
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"
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|ns s string|
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ns := NumberSet new.
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ns add:1.
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ns add:2.
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ns add:3.
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ns add:5.
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s := '' writeStream.
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ns printOn:s.
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string := s contents.
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NumberSet readFrom:string.
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"
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"Modified: 9.5.1996 / 18:45:37 / cg"
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! !
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!NumberSet methodsFor:'accessing'!
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lastOfFirstInterval
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"return the last element of the first interval.
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Return nil if the receiver is empty."
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|element|
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intervals isNil ifTrue:[^ nil].
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element := intervals at:1.
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(element isNumber) ifFalse:[^ element stop].
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^ element
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"Modified: 9.5.1996 / 17:31:37 / cg"
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! !
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!NumberSet methodsFor:'adding & removing'!
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add:aNumber
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"add the argument, aNumber to the NumberSet"
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|index endIndex searching element nextElement newIntervals|
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intervals isNil ifTrue:[
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intervals := OrderedCollection with:aNumber.
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^ self
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].
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"/ search for an interval to expand (on the fly watch out if already there)
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index := 1.
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endIndex := intervals size.
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searching := true.
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[searching] whileTrue:[
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element := intervals at:index.
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(element isNumber) ifTrue:[
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"make a number to an interval"
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(element = (aNumber - 1)) ifTrue:[
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intervals at:index put:(element to:aNumber).
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self tryMerge:index.
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^ self
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].
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(element = (aNumber + 1)) ifTrue:[
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intervals at:index put:(aNumber to:element).
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self tryMerge:(index - 1).
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^ self
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].
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"already in set"
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(element = aNumber) ifTrue:[^ self].
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"not in - stop search"
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(element > aNumber) ifTrue:[searching := false]
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] ifFalse:[
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"expand interval"
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(element start = (aNumber + 1)) ifTrue:[
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element start:aNumber.
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self tryMerge:(index - 1).
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^ self
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].
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(element stop = (aNumber - 1)) ifTrue:[
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element stop:aNumber.
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self tryMerge:index.
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^ self
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].
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"already in set"
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((element start <= aNumber) and:[
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(element stop >= aNumber)]) ifTrue:[^ self].
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"not in - stop search"
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(element start > aNumber) ifTrue:[searching := false]
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].
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searching ifTrue:[
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index := index + 1.
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(index > endIndex) ifTrue:[searching := false]
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]
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].
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"/ append at end
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(index > endIndex) ifTrue:[
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intervals add:aNumber.
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^ self
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].
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"/ insert before index
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intervals add:aNumber beforeIndex:index.
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"Modified: 9.5.1996 / 17:31:05 / cg"
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!
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remove:aNumber ifAbsent:aBlock
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"remove the argument, aNumber from the NumberSet"
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|index endIndex element newIntervals|
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(intervals isNil or:[intervals size == 0]) ifTrue:[
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^ aBlock value
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].
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index := 1.
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endIndex := intervals size.
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[true] whileTrue:[
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element := intervals at:index.
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(element isNumber) ifTrue:[
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(element = aNumber) ifTrue:[
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(intervals size == 1) ifTrue:[
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intervals := nil
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] ifFalse:[
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intervals removeIndex:index
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].
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^ self
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].
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"not in - stop search"
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(element > aNumber) ifTrue:[^ aBlock value]
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] ifFalse:[
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"can remove from interval ?"
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(element start = aNumber) ifTrue:[
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element start:(aNumber + 1).
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(element start = element stop) ifTrue:[
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intervals at:index put:(element start)
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].
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^ self
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].
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(element stop = aNumber) ifTrue:[
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element stop:(aNumber - 1).
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(element start = element stop) ifTrue:[
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intervals at:index put:(element start)
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].
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^ self
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].
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(element start > aNumber) ifTrue:[^ aBlock value].
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((element start <= aNumber) and:[
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(element stop >= aNumber)]) ifTrue:[
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"must make it two intervals"
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newIntervals := OrderedCollection new:(endIndex + 1).
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newIntervals replaceFrom:1 to:(index - 1) with:intervals.
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newIntervals replaceFrom:(index + 2) to:(endIndex + 1)
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with:intervals startingAt:(index + 1).
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(element start = (aNumber - 1)) ifTrue:[
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newIntervals at:index put:element start
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] ifFalse:[
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newIntervals at:index put:(element start to:(aNumber - 1))
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].
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((aNumber + 1) = element stop) ifTrue:[
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newIntervals at:(index + 1) put:(aNumber + 1)
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249 |
] ifFalse:[
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newIntervals at:(index + 1) put:((aNumber + 1) to:element stop)
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].
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intervals := newIntervals.
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^ self
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]
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].
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index := index + 1.
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(index > endIndex) ifTrue:[^ aBlock value]
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|
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]
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16
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259 |
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292
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260 |
"Modified: 9.5.1996 / 17:30:52 / cg"
|
16
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! !
|
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262 |
|
292
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!NumberSet methodsFor:'enumerating'!
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16
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do:aBlock
|
292
|
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"evaluate the argument, aBlock for each element in the numberSet"
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267 |
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intervals isNil ifTrue:[^ self].
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intervals do:[:element |
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292
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(element isNumber) ifTrue:[
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aBlock value:element
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] ifFalse:[
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element do:aBlock
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]
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]
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|
276 |
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277 |
"Modified: 9.5.1996 / 17:30:19 / cg"
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16
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! !
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279 |
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280 |
!NumberSet methodsFor:'printing'!
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281 |
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displayString
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"return a nice string"
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|first s|
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286 |
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intervals size == 0 ifTrue:[^ 'NumberSet()'].
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s := 'NumberSet('.
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first := true.
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intervals do:[:element |
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first ifTrue:[
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first := false
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] ifFalse:[
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s := s , ','
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].
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(element isNumber) ifTrue:[
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s := s , (element printString)
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] ifFalse:[
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s := s , (element start printString).
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s := s , '-'.
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s := s , (element stop printString)
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]
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].
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s := s , ')'.
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306 |
^ s
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|
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|
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"Modified: 9.5.1996 / 17:30:14 / cg"
|
|
309 |
!
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310 |
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printOn:aStream
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"output the NumberSet (in .newsrc format) on aStream"
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313 |
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|first|
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315 |
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intervals isNil ifTrue:[^ self].
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first := true.
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intervals do:[:element |
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|
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first ifTrue:[
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first := false
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] ifFalse:[
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aStream nextPut:$,
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324 |
].
|
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325 |
(element isNumber) ifTrue:[
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326 |
aStream nextPutAll:(element printString)
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|
327 |
] ifFalse:[
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|
328 |
aStream nextPutAll:(element start printString).
|
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329 |
aStream nextPut:$-.
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330 |
aStream nextPutAll:(element stop printString)
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|
331 |
]
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|
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]
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16
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|
292
|
334 |
"Modified: 9.5.1996 / 17:30:10 / cg"
|
16
|
335 |
! !
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336 |
|
|
337 |
!NumberSet methodsFor:'private'!
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338 |
|
293
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readFrom:aStringOrStream
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16
|
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"read my value from aStream (in .newsrc format)"
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341 |
|
293
|
342 |
|s nextChar arr start stop done|
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|
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293
|
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s := aStringOrStream readStream.
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345 |
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346 |
s skipSeparators.
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347 |
s atEnd ifTrue:[^ nil].
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16
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348 |
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199
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intervals := OrderedCollection new.
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16
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350 |
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|
351 |
done := false.
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[done] whileFalse:[
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293
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s atEnd ifTrue:[
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292
|
354 |
done := true
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|
355 |
] ifFalse:[
|
293
|
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start := Number readFrom:s.
|
292
|
357 |
start isNil ifTrue:[
|
|
358 |
done := true
|
|
359 |
] ifFalse:[
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293
|
360 |
s skipSeparators.
|
|
361 |
s atEnd ifTrue:[
|
292
|
362 |
intervals add:start.
|
|
363 |
done := true
|
|
364 |
] ifFalse:[
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293
|
365 |
nextChar := s peek.
|
292
|
366 |
(nextChar == $-) ifTrue:[
|
293
|
367 |
s next.
|
|
368 |
stop := Number readFrom:s.
|
292
|
369 |
intervals add:(start to:stop)
|
|
370 |
] ifFalse:[
|
|
371 |
intervals add:start
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|
372 |
].
|
293
|
373 |
s skipSeparators.
|
|
374 |
s atEnd ifTrue:[
|
292
|
375 |
done := true
|
|
376 |
] ifFalse:[
|
293
|
377 |
nextChar := s peek.
|
292
|
378 |
(nextChar == $,) ifFalse:[
|
|
379 |
done := true
|
|
380 |
] ifTrue:[
|
293
|
381 |
s next
|
292
|
382 |
]
|
|
383 |
]
|
|
384 |
]
|
|
385 |
]
|
|
386 |
]
|
16
|
387 |
].
|
|
388 |
(intervals size == 0) ifTrue:[
|
292
|
389 |
intervals := nil
|
16
|
390 |
]
|
|
391 |
|
292
|
392 |
"
|
|
393 |
NumberSet new readFrom:(ReadStream on:'0-62,69,82,84,86,88,91')
|
293
|
394 |
NumberSet new readFrom:'0-62,69,82,84,86,88,91'
|
292
|
395 |
"
|
|
396 |
|
293
|
397 |
"Modified: 9.5.1996 / 18:46:26 / cg"
|
292
|
398 |
!
|
|
399 |
|
|
400 |
tryMerge:index
|
|
401 |
"try to make element at index and index + 1 be one element"
|
|
402 |
|
|
403 |
|element first last first2 last2 nextElement|
|
|
404 |
|
|
405 |
(index > 0) ifTrue:[
|
|
406 |
(index < (intervals size)) ifTrue:[
|
|
407 |
element := intervals at:index.
|
|
408 |
(element isNumber) ifFalse:[
|
|
409 |
first := element start.
|
|
410 |
last := element stop
|
|
411 |
] ifTrue:[
|
|
412 |
first := element.
|
|
413 |
last := element
|
|
414 |
].
|
|
415 |
|
|
416 |
nextElement := intervals at:(index + 1).
|
|
417 |
(nextElement isNumber) ifFalse:[
|
|
418 |
first2 := nextElement start.
|
|
419 |
last2 := nextElement stop
|
|
420 |
] ifTrue:[
|
|
421 |
first2 := nextElement.
|
|
422 |
last2 := nextElement
|
|
423 |
].
|
|
424 |
|
|
425 |
(last >= (first2 - 1)) ifTrue:[
|
|
426 |
intervals at:index put:(first to:last2).
|
|
427 |
intervals removeIndex:(index + 1)
|
|
428 |
]
|
|
429 |
]
|
|
430 |
]
|
|
431 |
|
|
432 |
"Modified: 9.5.1996 / 17:29:50 / cg"
|
16
|
433 |
! !
|
|
434 |
|
|
435 |
!NumberSet methodsFor:'private accessing'!
|
|
436 |
|
|
437 |
setFirst:aNumberOrInterval
|
292
|
438 |
"set the first element"
|
|
439 |
|
199
|
440 |
intervals := OrderedCollection with:aNumberOrInterval
|
292
|
441 |
|
|
442 |
"Modified: 9.5.1996 / 17:26:26 / cg"
|
16
|
443 |
! !
|
|
444 |
|
292
|
445 |
!NumberSet methodsFor:'queries'!
|
16
|
446 |
|
292
|
447 |
first
|
|
448 |
"answer the first i.e. lowest number in the set.
|
|
449 |
If the receiver is empty, return nil."
|
|
450 |
|
16
|
451 |
|element|
|
|
452 |
|
|
453 |
intervals isNil ifTrue:[^ nil].
|
292
|
454 |
|
16
|
455 |
element := intervals at:1.
|
292
|
456 |
(element isNumber) ifTrue:[
|
|
457 |
^ element
|
|
458 |
].
|
|
459 |
^ element start
|
|
460 |
|
|
461 |
"Modified: 9.5.1996 / 17:29:14 / cg"
|
|
462 |
!
|
|
463 |
|
|
464 |
includes:aNumber
|
|
465 |
"answer true, if aNumber is in the set"
|
|
466 |
|
|
467 |
|endIndex index middle delta element start stop|
|
|
468 |
|
|
469 |
intervals isNil ifTrue:[^ false].
|
|
470 |
|
|
471 |
index := 1.
|
|
472 |
endIndex := intervals size.
|
|
473 |
|
|
474 |
"/ use a binary search, to limit search
|
|
475 |
|
|
476 |
middle := (endIndex + index) // 2.
|
|
477 |
[(middle > (index + 1)) and:[middle < (endIndex - 1)]] whileTrue:[
|
|
478 |
element := intervals at:middle.
|
|
479 |
(element isNumber) ifFalse:[
|
|
480 |
(element stop <= aNumber) ifTrue:[
|
|
481 |
index := middle
|
|
482 |
] ifFalse:[
|
|
483 |
(element start >= aNumber) ifTrue:[
|
|
484 |
endIndex := middle
|
|
485 |
] ifFalse:[
|
|
486 |
(element includes:aNumber) ifTrue:[^ true]
|
|
487 |
]
|
|
488 |
]
|
|
489 |
] ifTrue:[
|
|
490 |
(element <= aNumber) ifTrue:[
|
|
491 |
(element == aNumber) ifTrue:[^ true].
|
|
492 |
index := middle
|
|
493 |
] ifFalse:[
|
|
494 |
endIndex := middle
|
|
495 |
]
|
|
496 |
].
|
|
497 |
middle := (endIndex + index) // 2
|
|
498 |
].
|
16
|
499 |
|
292
|
500 |
[index <= endIndex] whileTrue:[
|
|
501 |
element := intervals at:index.
|
|
502 |
(element isNumber) ifFalse:[
|
|
503 |
(element start > aNumber) ifTrue:[ ^ false].
|
|
504 |
(element stop >= aNumber) ifTrue:[ ^ true]
|
|
505 |
] ifTrue:[
|
|
506 |
(element > aNumber) ifTrue:[ ^ false].
|
|
507 |
(element = aNumber) ifTrue:[ ^ true]
|
|
508 |
].
|
|
509 |
index := index + 1
|
|
510 |
].
|
|
511 |
|
|
512 |
^ false
|
|
513 |
|
|
514 |
"Modified: 9.5.1996 / 17:29:05 / cg"
|
|
515 |
!
|
|
516 |
|
|
517 |
last
|
|
518 |
"answer the last i.e. highest number in the set.
|
|
519 |
If the receiver is empty, return nil."
|
|
520 |
|
|
521 |
|element|
|
|
522 |
|
|
523 |
intervals isNil ifTrue:[^ nil].
|
|
524 |
|
|
525 |
element := intervals last.
|
|
526 |
(element isNumber) ifTrue:[
|
|
527 |
^ element
|
|
528 |
].
|
|
529 |
^ element stop
|
|
530 |
|
|
531 |
"Modified: 9.5.1996 / 17:29:10 / cg"
|
|
532 |
!
|
|
533 |
|
|
534 |
size
|
|
535 |
"return the number of elements in the Set"
|
|
536 |
|
|
537 |
|tally|
|
|
538 |
|
|
539 |
intervals isNil ifTrue:[^ 0].
|
|
540 |
tally := 0.
|
|
541 |
|
|
542 |
intervals do:[:element |
|
|
543 |
(element isNumber) ifTrue:[
|
|
544 |
tally := tally + 1
|
|
545 |
] ifFalse:[
|
|
546 |
tally := tally + element size
|
|
547 |
]
|
|
548 |
].
|
|
549 |
^ tally
|
|
550 |
|
|
551 |
"Modified: 9.5.1996 / 17:29:20 / cg"
|
16
|
552 |
! !
|
292
|
553 |
|
|
554 |
!NumberSet class methodsFor:'documentation'!
|
|
555 |
|
|
556 |
version
|
1244
|
557 |
^ '$Header: /cvs/stx/stx/libbasic2/NumberSet.st,v 1.9 2003-06-11 08:08:35 cg Exp $'
|
292
|
558 |
! !
|