#FEATURE by cg
class: Socket class
added: #newTCPclientToHost:port:domain:domainOrder:withTimeout:
changed: #newTCPclientToHost:port:domain:withTimeout:
"{ Encoding: utf8 }"
"
COPYRIGHT.
The above file is a Manchester Goodie protected by copyright.
These conditions are imposed on the whole Goodie, and on any significant
part of it which is separately transmitted or stored:
* You must ensure that every copy includes this notice, and that
source and author(s) of the material are acknowledged.
* These conditions must be imposed on anyone who receives a copy.
* The material shall not be used for commercial gain without the prior
written consent of the author(s).
Further information on the copyright conditions may be obtained by
sending electronic mail:
To: goodies-lib@cs.man.ac.uk
Subject: copyright
or by writing to The Smalltalk Goodies Library Manager, Dept of
Computer Science, The University, Manchester M13 9PL, UK
(C) Copyright 1992 University of Manchester
For more information about the Manchester Goodies Library (from which
this file was distributed) send e-mail:
To: goodies-lib@cs.man.ac.uk
Subject: help
"
"{ Package: 'stx:libbasic2' }"
"{ NameSpace: Smalltalk }"
Collection subclass:#Iterator
instanceVariableNames:'block'
classVariableNames:''
poolDictionaries:''
category:'Collections-Sequenceable'
!
Iterator comment:'An Iterator is a read-only collection that evaluates a block to yield the elements
of the collection.'
!
!Iterator class methodsFor:'documentation'!
copyright
"
COPYRIGHT.
The above file is a Manchester Goodie protected by copyright.
These conditions are imposed on the whole Goodie, and on any significant
part of it which is separately transmitted or stored:
* You must ensure that every copy includes this notice, and that
source and author(s) of the material are acknowledged.
* These conditions must be imposed on anyone who receives a copy.
* The material shall not be used for commercial gain without the prior
written consent of the author(s).
Further information on the copyright conditions may be obtained by
sending electronic mail:
To: goodies-lib@cs.man.ac.uk
Subject: copyright
or by writing to The Smalltalk Goodies Library Manager, Dept of
Computer Science, The University, Manchester M13 9PL, UK
(C) Copyright 1992 University of Manchester
For more information about the Manchester Goodies Library (from which
this file was distributed) send e-mail:
To: goodies-lib@cs.man.ac.uk
Subject: help
"
!
documentation
"
Occasionally you may have a block that when evaluated can be
treated as a collection -- i.e. it takes another block as parameter,
then applies that to a sequence of values.
This goodie wraps the block into an object -- an iterator -- which is
part of the collection hierarchy, and therefore inherits a variety of
useful collection-related methods.
[info:]
NAME Iterator
AUTHOR miw@cs.man.ac.uk (Mario Wolczko)
FUNCTION a wrapper for blocks that iterate over collections
ST-VERSION 4.0 4.1
PREREQUISITES
CONFLICTS
DISTRIBUTION world
VERSION 1
DATE 18 Jun 1991
SUMMARY
[organisation:]
Dept. of Computer Science Internet: mario@cs.man.ac.uk
The University uucp: uknet!!!!man.cs!!!!mario
Manchester M13 9PL JANET: mario@uk.ac.man.cs
U.K. Tel: +44-61-275 6146 (FAX: 6236)
______the mushroom project___________________________________
[author:]
Mario Wolczko miw@cs.man.ac.uk
"
!
examples
"
an iterator, simulating the collection of all classes in the system:
[exBegin]
|i b|
b := [:whatToDo |
Smalltalk allClassesDo:[:cls |
whatToDo value:cls
]
].
i := Iterator on:b.
i do:[:cls |
Transcript showCR:cls name
].
[exEnd]
much like above, one that simulates the collection of all methodNames starting with 'a':
[exBegin]
|i b|
b := [:whatToDo |
Smalltalk allClassesDo:[:cls |
cls methodDictionary keysAndValuesDo:[:nm :mthd |
(nm startsWith:$a) ifTrue:[
whatToDo value:nm
]
]
]
].
i := Iterator on:b.
i do:[:nm |
Transcript showCR:nm
].
[exEnd]
an iterator, simulating a collection of 100 random values:
[exBegin]
|i b|
b := [:whatToDo |
|rnd|
rnd := Random new.
1 to:100 do:[:i |
whatToDo value:(rnd next)
]
].
i := Iterator on:b.
i do:[:j |
j printNL
].
[exEnd]
an iterator, simulating a collection of the lines
in a file:
[exBegin]
|i b|
b := [:whatToDo |
|s line|
s := 'smalltalk.rc' asFilename readStream.
[s atEnd] whileFalse:[
line := s nextLine.
whatToDo value:line.
].
s close
].
i := Iterator on:b.
i do:[:j |
j printNL
].
[exEnd]
"
! !
!Iterator class methodsFor:'instance creation'!
on: aBlock
^ self new block: aBlock
"
|i b|
b := [:whatToDo |
1 to:10 do:[:i |
whatToDo value:i
]
].
i := Iterator on:b.
i do:[:j |
Transcript showCR:j
].
"
"
an iterator, simulating a collection of 100 random values:
|i b|
b := [:whatToDo |
|rnd|
rnd := Random new.
1 to:100 do:[:i |
whatToDo value:(rnd next)
]
].
i := Iterator on:b.
i do:[:j |
j printNL
].
"
"Modified: 9.5.1996 / 14:26:49 / cg"
!
on:collection msg:oneArgSelector
^ self new block: [ :aBlock | collection perform:oneArgSelector with: aBlock]
"
|i|
i := Iterator on:#(1 2 3 4 5 6 7) msg:#reverseDo:.
i do:[:j |
Transcript showCR:j
].
"
"Modified: 9.5.1996 / 14:21:40 / cg"
! !
!Iterator methodsFor:'accessing'!
identityIndexOf: anElement
"Answer the identity index of anElement within the receiver.
If the receiver does not contain anElement, answer 0."
^self identityIndexOf: anElement ifAbsent: [0]
!
identityIndexOf: anElement ifAbsent: exceptionBlock
"Answer the identity index of anElement within the receiver.
If the receiver does not contain anElement, answer the result
of evaluating the exceptionBlock."
| index |
index := 1.
self do: [ :el | el == anElement ifTrue: [^index]. index := index + 1].
^exceptionBlock value
!
indexOf: anElement
"Answer the index of anElement within the receiver. If the receiver does
not contain anElement, answer 0."
^self indexOf: anElement ifAbsent: [0]
!
indexOf: anElement ifAbsent: exceptionBlock
"Answer the index of anElement within the receiver. If the receiver does
not contain anElement, answer the result of evaluating the exceptionBlock."
| index |
index := 1.
self do: [ :el | el = anElement ifTrue: [^index]. index := index + 1].
^ exceptionBlock value
! !
!Iterator methodsFor:'adding & removing'!
add: anObject
"raises an error: Iterators are read-only"
self shouldNotImplement
!
remove: oldObject ifAbsent: anExceptionBlock
"Iterators are read-only."
self shouldNotImplement
!
removeIdentical: oldObject ifAbsent: anExceptionBlock
"Iterators are read-only."
self shouldNotImplement
! !
!Iterator methodsFor:'converting'!
asOrderedCollection
"Answer a new instance of OrderedCollection whose elements are the elements of
the receiver. The order in which elements are added depends on the order in
which the receiver enumerates its elements. In the case of unordered collections,
the ordering is not necessarily the same for multiple requests for the conversion."
| anOrderedCollection |
anOrderedCollection := OrderedCollection new.
self do: [:each | anOrderedCollection add:each].
^anOrderedCollection
! !
!Iterator methodsFor:'enumerating'!
collect:aBlock as:aClass
"Reimplemented here as Iterator does not support #size.
aClass must be a non-fixed collection."
|newCollection sz|
newCollection := aClass new.
newCollection isFixedSize ifFalse:[
newCollection := OrderedCollection new.
self do:[:el |
newCollection add:(aBlock value:el).
].
sz := newCollection size.
^ ((aClass new:sz) grow:sz) replaceFrom:1 with:newCollection.
].
self do:[:el |
newCollection add:(aBlock value:el).
].
^ newCollection
"
(Iterator on:[:whatToDo| 'abcd' do:whatToDo])
collect:[:element | element asUppercase] as:OrderedCollection
(Iterator on:[:whatToDo| 'abcd' do:whatToDo])
collect:[:element | element asUppercase] as:Array
(Iterator on:[:whatToDo| '1234' do:whatToDo])
collect:[:char | char digitValue] as:ByteArray
"
"Created: / 21-10-2013 / 16:07:53 / Jan Vrany <jan.vrany@fit.cvut.cz>"
"Modified: / 09-01-2019 / 17:41:50 / Claus Gittinger"
!
detectLast:aBlock ifNone:anExceptionValue
"evaluate the argument, aBlock for each element in the receiver until
the block returns true; in this case return the element which caused
the true evaluation. The elements are processed in reverse order.
If none of the evaluations returns true, return the value of anExceptionValue"
| last |
self do: [:each |
(aBlock value:each) ifTrue: [last := each]
].
last isNil ifTrue:[
^ anExceptionValue value.
].
^ last
"
(Iterator on:[:whatToDo| #(1 2 3 4) do:whatToDo]) detectLast:[:n | n odd] ifNone:['sorry']
(Iterator on:[:whatToDo| #(2 4 6 8) do:whatToDo]) detectLast:[:n | n odd] ifNone:['sorry']
"
!
do: aBlock
block value: aBlock
!
findFirst: aBlock ifNone:exceptionalValue
"Answer the index of the first element of the receiver
for which aBlock evaluates as true."
| index |
index := 1.
self do: [ :el | (aBlock value: el) ifTrue: [^index]. index := index + 1].
^exceptionalValue value
!
findLast: aBlock
"Answer the index of the last element of the receiver
for which aBlock evaluates as true."
| index last |
index := 1.
last := 0.
self do: [ :el | (aBlock value: el) ifTrue: [last := index]. index := index + 1].
^last
!
keysAndValuesDo: aBlock
"Evaluate aBlock with each of the receiver's key/value pairs
(e.g. indexes and elements) as the arguments."
| index |
index := 1.
self do: [:el | aBlock value: index value: el. index := index + 1]
!
reverseDo:aBlock
"evaluate the argument, aBlock for each element in reverse order."
"it could be defined in terms of do: - but very inefficient.
Better force programmer to define a better version ..."
^ self shouldNotImplement
! !
!Iterator methodsFor:'printing & storing'!
displayOn:aGCOrStream
"/ what a kludge - Dolphin and Squeak mean: printOn: a stream;
"/ old ST80 means: draw-yourself on a GC.
(aGCOrStream isStream) ifTrue:[
aGCOrStream nextPutAll:'Iterator('.
block displayOn:aGCOrStream.
aGCOrStream nextPutAll:')'.
^ self
].
^ super displayOn:aGCOrStream.
"Modified: / 06-10-2006 / 14:35:23 / cg"
"Modified (comment): / 22-02-2017 / 16:48:43 / cg"
!
printOn:aStream
aStream nextPutAll:'Iterator('.
block printOn:aStream.
aStream nextPutAll:')'.
"Created: / 06-10-2006 / 13:44:42 / cg"
! !
!Iterator methodsFor:'private'!
block
^ block
!
block: aBlock
block := aBlock
!
species
"return the type of collection to be returned by collect, select etc."
^ OrderedCollection
! !
!Iterator methodsFor:'queries'!
isEmpty
^ false
"Created: / 15-03-2007 / 16:23:48 / cg"
!
size
self shouldNotImplement
"Created: / 1.11.1997 / 17:29:03 / cg"
! !
!Iterator class methodsFor:'documentation'!
version
^ '$Header$'
!
version_CVS
^ '$Header$'
! !