author | Stefan Vogel <sv@exept.de> |
Sun, 26 Oct 2014 23:19:04 +0100 | |
changeset 16909 | d02e5b66902a |
parent 16275 | 062c57a36882 |
child 18120 | e3a375d5f6a8 |
child 18396 | b42870402e9b |
permissions | -rw-r--r-- |
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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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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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31 |
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. |
209 |
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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|
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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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264 |
|
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|tmp exit| |
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266 |
|
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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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282 |
|
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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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292 |
|
11837 | 293 |
to:stop count:aBlock |
294 |
"same as (self to:stop) count:aBlock" |
|
295 |
||
296 |
|cnt| |
|
297 |
||
298 |
cnt := 0. |
|
299 |
self to:stop do:[:i | |
|
300 |
(aBlock value:i) ifTrue:[ cnt := cnt + 1 ]. |
|
301 |
]. |
|
302 |
^ cnt |
|
303 |
||
304 |
" |
|
305 |
1 to:10 count:[:n | n even] |
|
306 |
" |
|
307 |
! |
|
308 |
||
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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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312 |
|
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|tmp| |
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314 |
|
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tmp := self. |
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[stop < tmp] whileFalse:[ |
6073 | 317 |
aBlock value:tmp. |
318 |
tmp := tmp+1 |
|
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319 |
] |
6073 | 320 |
|
321 |
" |
|
322 |
1 to:10 do:[:i | Transcript showCR:i]. |
|
323 |
1 to:10 by:2 do:[:i | Transcript showCR:i]. |
|
324 |
10 to:1 by:-1 do:[:i | Transcript showCR:i]. |
|
325 |
" |
|
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326 |
! |
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327 |
|
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to:stop doWithBreak:aBlock |
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329 |
"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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331 |
Pass a break argument, to allow for premature exit of the loop." |
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332 |
|
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333 |
|tmp break| |
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334 |
|
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335 |
break := [^ self]. |
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336 |
tmp := self. |
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337 |
[stop < tmp] whileFalse:[ |
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338 |
aBlock value:tmp value:break. |
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339 |
tmp := tmp+1 |
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340 |
] |
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341 |
|
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342 |
" |
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343 |
1 to:10 doWithBreak:[:index :break | |
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344 |
Transcript showCR:index printString. |
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345 |
index > 5 ifTrue:[ |
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346 |
break value |
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347 |
]. |
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348 |
] |
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349 |
" |
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350 |
! |
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351 |
|
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352 |
to:stop doWithExit:aBlock |
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353 |
"For each element of the interval from the receiver up to the argument stop, |
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|
354 |
evaluate aBlock, passing the number as argument. |
15374 | 355 |
Passes an additional exit object, which can be used to leave |
356 |
the loop early, by sending it a #value: message. |
|
357 |
Returns nil or the value passed to the exit>>value: message. |
|
358 |
||
359 |
Notice, that this is different to a return statement in the block, |
|
360 |
which returns from the enclosed method, NOT only from the block." |
|
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|
361 |
|
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|
362 |
|exit tmp| |
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|
363 |
|
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|
364 |
exit := [:exitValue | ^exitValue]. |
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|
365 |
tmp := self. |
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|
366 |
[stop < tmp] whileFalse:[ |
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|
367 |
aBlock value:tmp value:exit. |
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|
368 |
tmp := tmp+1 |
15374 | 369 |
]. |
370 |
^ nil |
|
5565
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|
371 |
|
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|
372 |
" |
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|
373 |
1 to:10 doWithExit:[:index :exit | |
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|
374 |
index == 5 ifTrue:[ |
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|
375 |
exit value:nil |
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|
376 |
]. |
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|
377 |
Transcript showCR:index. |
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|
378 |
]. |
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|
379 |
" |
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|
380 |
! ! |
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|
381 |
|
1 | 382 |
!Magnitude methodsFor:'testing'! |
383 |
||
384 |
between:min and:max |
|
385 |
"return whether the receiver is less than or equal to the argument max |
|
386 |
and greater than or equal to the argument min." |
|
387 |
||
388 |
(self < min) ifTrue:[^ false]. |
|
8181
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Only use #< for comparisons, since this is the base mechanism.
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|
389 |
(max < self) ifTrue:[^ false]. |
1 | 390 |
^ true |
56 | 391 |
|
213 | 392 |
" |
393 |
1.2 between:1 and:2 |
|
394 |
(3/2) between:1 and:2 |
|
395 |
(3/2) between:0 and:1 |
|
396 |
" |
|
1 | 397 |
! |
398 |
||
399 |
in:anInterval |
|
400 |
"return whether the receiver is within the interval bounds" |
|
401 |
||
402 |
(self < anInterval start) ifTrue:[^ false]. |
|
8181
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Only use #< for comparisons, since this is the base mechanism.
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|
403 |
(anInterval stop < self) ifTrue:[^ false]. |
1 | 404 |
^ true |
56 | 405 |
|
213 | 406 |
" |
407 |
1.2 in:(1 to: 2) |
|
408 |
(3/2) in:(1 to: 2) |
|
409 |
(3/2) in:(0 to: 1) |
|
410 |
" |
|
1 | 411 |
! ! |
699 | 412 |
|
413 |
!Magnitude class methodsFor:'documentation'! |
|
414 |
||
415 |
version |
|
16275 | 416 |
^ '$Header: /cvs/stx/stx/libbasic/Magnitude.st,v 1.27 2014-03-24 11:28:33 stefan Exp $' |
699 | 417 |
! ! |
15374 | 418 |