author | Claus Gittinger <cg@exept.de> |
Mon, 08 Jun 2015 21:22:21 +0200 | |
changeset 18465 | e9e4bb62235f |
parent 18396 | b42870402e9b |
child 18397 | 20527009f352 |
child 19005 | 49909c52b8ed |
permissions | -rw-r--r-- |
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"{ Encoding: utf8 }" |
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" |
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COPYRIGHT (c) 1988 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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"{ Package: 'stx:libbasic' }" |
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"{ NameSpace: Smalltalk }" |
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Object subclass:#Magnitude |
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instanceVariableNames:'' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'Magnitude-General' |
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! |
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!Magnitude class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1988 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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documentation |
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" |
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This is an abstract class definining common methods for |
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Objects which can be compared by a kind of less than relation. |
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[author:] |
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Claus Gittinger |
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" |
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! ! |
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!Magnitude class methodsFor:'queries'! |
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isAbstract |
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"Return if this class is an abstract class. |
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True is returned for Magnitude here; false for subclasses. |
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Abstract subclasses must redefine again." |
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^ self == Magnitude |
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! ! |
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!Magnitude methodsFor:'Compatibility-Squeak'! |
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min:aMin max:aMax |
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"similar to clampBetween:and:" |
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^ (self min: aMin) max: aMax |
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"Created: / 06-06-2007 / 11:00:22 / cg" |
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! ! |
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!Magnitude methodsFor:'comparing'! |
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< aMagnitude |
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"Compare the receiver with the argument and return true if the |
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receiver is less than the argument. Otherwise return false." |
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^ self subclassResponsibility |
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! |
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<= aMagnitude |
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"return true, if the argument is greater or equal than the receiver" |
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^ (aMagnitude < self) not |
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! |
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= aMagnitude |
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"Compare the receiver with the argument and return true if the |
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receiver is equal to the argument. Otherwise return false." |
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^ self subclassResponsibility |
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! |
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> aMagnitude |
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"return true, if the argument is less than the receiver" |
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^ aMagnitude < self |
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! |
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>= aMagnitude |
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"return true, if the argument is less or equal than the receiver" |
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^ (self < aMagnitude) not |
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! |
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clampBetween:min and:max |
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"return the receiver if its between min .. max, |
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or min if its less than min, or max of its greater than max. |
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This is only a lazy-typers helper for: ((something min:max) max:min)" |
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(max < self) ifTrue:[^ max]. |
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(self < min) ifTrue:[^ min]. |
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^ self |
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" |
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1 clampBetween:2 and:5 |
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3 clampBetween:2 and:5 |
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6 clampBetween:2 and:5 |
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" |
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"Modified: 19.4.1996 / 14:58:12 / cg" |
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! |
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compare:arg ifLess:lessBlock ifEqual:equalBlock ifGreater:greaterBlock |
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"three-way compare - thanks to Self for this idea. |
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Can be redefined in subclasses to do it with a single comparison if |
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comparison is expensive." |
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self < arg ifTrue:[ |
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^ lessBlock value |
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]. |
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self = arg ifTrue:[ |
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^ equalBlock value |
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]. |
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^ greaterBlock value |
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! |
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hash |
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"instances, for which #= answers true must answer the same hash" |
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^ self subclassResponsibility |
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! |
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max:aMagnitude |
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"return the receiver or the argument, whichever has greater magnitude" |
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(aMagnitude < self) ifTrue:[^ self]. |
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^ aMagnitude |
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" |
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1 max: 2 |
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1 max: 2.0 |
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2.0 max: 1.0 |
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2.0 max: 2 |
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" |
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! |
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min:aMagnitude |
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"return the receiver or the argument, whichever has lesser magnitude" |
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(self < aMagnitude) ifTrue:[^ self]. |
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^ aMagnitude |
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" |
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1 min: 2 |
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1 min: 2.0 |
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2.0 min: 1.0 |
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2.0 min: 2 |
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" |
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! ! |
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!Magnitude methodsFor:'iteration'! |
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downTo:stop by:step do:aBlock |
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"For each element of the interval from the receiver down to the argument stop, |
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decrementing by step, evaluate aBlock, passing the number as argument." |
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^ self to:stop by:step negated do:aBlock |
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" |
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10 downTo:1 by:2 do:[:i | Transcript showCR:i]. |
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" |
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! |
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downTo:stop do:aBlock |
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"For each element of the interval from the receiver down to the argument stop, |
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evaluate aBlock, passing the number as argument." |
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^ self to:stop by:-1 do:aBlock |
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" |
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10 downTo:1 do:[:i | Transcript showCR:i]. |
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$d downTo:$a do:[:i | Transcript showCR:i]. |
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" |
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! |
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to:stop by:incr do:aBlock |
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"For each element of the interval from the receiver up to the argument stop, incrementing |
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by step, evaluate aBlock passing the element as argument. |
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Not all Magnitudes do implement #negative and #+ however, |
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so should this method go to ArithmethicValue? |
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Only use #<, to speed up things (for subclasses only defining #<)" |
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|tmp| |
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tmp := self. |
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"using #negative would be more portable, but stc does only inline #< but not #negative (yet)" |
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"/ incr negative ifTrue:[ |
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incr < 0 ifTrue:[ |
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[tmp < stop] whileFalse:[ |
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aBlock value:tmp. |
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tmp := tmp+incr |
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] |
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] ifFalse:[ |
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[stop < tmp] whileFalse:[ |
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aBlock value:tmp. |
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tmp := tmp+incr |
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] |
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] |
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" |
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1 to:10 do:[:i | Transcript showCR:i]. |
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1 to:10 by:2 do:[:i | Transcript showCR:i]. |
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$a to:$z by:2 do:[:i | Transcript showCR:i]. |
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10 to:1 by:-1 do:[:i | Transcript showCR:i]. |
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" |
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! |
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to:stop by:incr doWithBreak:aBlock |
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"For each element of the interval from the receiver up to the argument stop, incrementing |
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by step, evaluate aBlock passing the element as argument. |
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Pass a break argument, to allow for premature exit of the loop." |
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|tmp break| |
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break := [^ self]. |
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tmp := self. |
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"using #negative would be more portable, but stc does only inline #< but not #negative (yet)" |
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"/ incr negative ifTrue:[ |
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incr < 0 ifTrue:[ |
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[tmp < stop] whileFalse:[ |
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aBlock value:tmp value:break. |
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tmp := tmp+incr |
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] |
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] ifFalse:[ |
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[stop < tmp] whileFalse:[ |
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aBlock value:tmp value:break. |
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tmp := tmp+incr |
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] |
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] |
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" |
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1 to:100 by:5 doWithBreak:[:index :break | |
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Transcript showCR:index printString. |
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index > 50 ifTrue:[ |
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break value |
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]. |
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] |
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" |
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! |
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263 |
|
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to:stop by:incr doWithExit:aBlock |
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"For each element of the interval from the receiver up to the argument stop, incrementing |
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by step, evaluate aBlock passing the element as argument. |
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Pass a break argument, to allow for premature exit of the loop." |
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268 |
|
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|tmp exit| |
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270 |
|
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exit := [:exitValue | ^ exitValue]. |
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tmp := self. |
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"using #negative would be more portable, but stc does only inline #< but not #negative (yet)" |
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"/ incr negative ifTrue:[ |
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incr < 0 ifTrue:[ |
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[tmp < stop] whileFalse:[ |
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aBlock value:tmp value:exit. |
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tmp := tmp+incr |
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] |
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] ifFalse:[ |
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[stop < tmp] whileFalse:[ |
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aBlock value:tmp value:exit. |
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tmp := tmp+incr |
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] |
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] |
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286 |
|
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" |
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1 to:100 by:5 doWithExit:[:index :exit | |
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Transcript showCR:index printString. |
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index > 50 ifTrue:[ |
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exit value:nil |
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]. |
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] |
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" |
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! |
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296 |
|
11837 | 297 |
to:stop count:aBlock |
298 |
"same as (self to:stop) count:aBlock" |
|
299 |
||
300 |
|cnt| |
|
301 |
||
302 |
cnt := 0. |
|
303 |
self to:stop do:[:i | |
|
304 |
(aBlock value:i) ifTrue:[ cnt := cnt + 1 ]. |
|
305 |
]. |
|
306 |
^ cnt |
|
307 |
||
308 |
" |
|
309 |
1 to:10 count:[:n | n even] |
|
310 |
" |
|
311 |
! |
|
312 |
||
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to:stop do:aBlock |
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"For each element of the interval from the receiver up to the argument stop, |
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evaluate aBlock, passing the number as argument." |
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316 |
|
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317 |
|tmp| |
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318 |
|
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tmp := self. |
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[stop < tmp] whileFalse:[ |
6073 | 321 |
aBlock value:tmp. |
322 |
tmp := tmp+1 |
|
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323 |
] |
6073 | 324 |
|
325 |
" |
|
326 |
1 to:10 do:[:i | Transcript showCR:i]. |
|
327 |
1 to:10 by:2 do:[:i | Transcript showCR:i]. |
|
328 |
10 to:1 by:-1 do:[:i | Transcript showCR:i]. |
|
329 |
" |
|
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330 |
! |
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331 |
|
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to:stop doWithBreak:aBlock |
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333 |
"For each element of the interval from the receiver up to the argument stop, |
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evaluate aBlock, passing the number as argument. |
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335 |
Pass a break argument, to allow for premature exit of the loop." |
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336 |
|
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337 |
|tmp break| |
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338 |
|
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339 |
break := [^ self]. |
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340 |
tmp := self. |
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[stop < tmp] whileFalse:[ |
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342 |
aBlock value:tmp value:break. |
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tmp := tmp+1 |
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344 |
] |
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345 |
|
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346 |
" |
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347 |
1 to:10 doWithBreak:[:index :break | |
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348 |
Transcript showCR:index printString. |
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|
349 |
index > 5 ifTrue:[ |
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350 |
break value |
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351 |
]. |
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352 |
] |
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353 |
" |
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354 |
! |
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355 |
|
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356 |
to:stop doWithExit:aBlock |
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357 |
"For each element of the interval from the receiver up to the argument stop, |
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358 |
evaluate aBlock, passing the number as argument. |
15374 | 359 |
Passes an additional exit object, which can be used to leave |
360 |
the loop early, by sending it a #value: message. |
|
361 |
Returns nil or the value passed to the exit>>value: message. |
|
362 |
||
363 |
Notice, that this is different to a return statement in the block, |
|
364 |
which returns from the enclosed method, NOT only from the block." |
|
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|
365 |
|
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|
366 |
|exit tmp| |
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|
367 |
|
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|
368 |
exit := [:exitValue | ^exitValue]. |
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|
369 |
tmp := self. |
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|
370 |
[stop < tmp] whileFalse:[ |
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371 |
aBlock value:tmp value:exit. |
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|
372 |
tmp := tmp+1 |
15374 | 373 |
]. |
374 |
^ nil |
|
5565
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|
375 |
|
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376 |
" |
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|
377 |
1 to:10 doWithExit:[:index :exit | |
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|
378 |
index == 5 ifTrue:[ |
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|
379 |
exit value:nil |
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|
380 |
]. |
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|
381 |
Transcript showCR:index. |
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|
382 |
]. |
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|
383 |
" |
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|
384 |
! ! |
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|
385 |
|
1 | 386 |
!Magnitude methodsFor:'testing'! |
387 |
||
388 |
between:min and:max |
|
18396 | 389 |
"return true if the receiver greater than or equal to the argument min |
390 |
and less than or equal to the argument max" |
|
1 | 391 |
|
392 |
(self < min) ifTrue:[^ false]. |
|
8181
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|
393 |
(max < self) ifTrue:[^ false]. |
1 | 394 |
^ true |
56 | 395 |
|
213 | 396 |
" |
397 |
1.2 between:1 and:2 |
|
398 |
(3/2) between:1 and:2 |
|
399 |
(3/2) between:0 and:1 |
|
400 |
" |
|
1 | 401 |
! |
402 |
||
403 |
in:anInterval |
|
404 |
"return whether the receiver is within the interval bounds" |
|
405 |
||
406 |
(self < anInterval start) ifTrue:[^ false]. |
|
8181
b2560b88a5b1
Only use #< for comparisons, since this is the base mechanism.
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|
407 |
(anInterval stop < self) ifTrue:[^ false]. |
1 | 408 |
^ true |
56 | 409 |
|
213 | 410 |
" |
411 |
1.2 in:(1 to: 2) |
|
412 |
(3/2) in:(1 to: 2) |
|
413 |
(3/2) in:(0 to: 1) |
|
414 |
" |
|
1 | 415 |
! ! |
699 | 416 |
|
417 |
!Magnitude class methodsFor:'documentation'! |
|
418 |
||
419 |
version |
|
18396 | 420 |
^ '$Header: /cvs/stx/stx/libbasic/Magnitude.st,v 1.28 2015-05-23 15:00:25 cg Exp $' |
699 | 421 |
! ! |
15374 | 422 |