297
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"
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This class is not covered by or part of the ST/X licence.
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3 |
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4 |
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COPYRIGHT.
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|
6 |
The above file is a Manchester Goodie protected by copyright.
|
|
7 |
These conditions are imposed on the whole Goodie, and on any significant
|
|
8 |
part of it which is separately transmitted or stored:
|
|
9 |
* You must ensure that every copy includes this notice, and that
|
|
10 |
source and author(s) of the material are acknowledged.
|
|
11 |
* These conditions must be imposed on anyone who receives a copy.
|
|
12 |
* The material shall not be used for commercial gain without the prior
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|
13 |
written consent of the author(s).
|
|
14 |
Further information on the copyright conditions may be obtained by
|
|
15 |
sending electronic mail:
|
|
16 |
To: goodies-lib@cs.man.ac.uk
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|
17 |
Subject: copyright
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|
18 |
or by writing to The Smalltalk Goodies Library Manager, Dept of
|
|
19 |
Computer Science, The University, Manchester M13 9PL, UK
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|
20 |
|
|
21 |
(C) Copyright 1993 University of Manchester
|
|
22 |
For more information about the Manchester Goodies Library (from which
|
|
23 |
this file was distributed) send e-mail:
|
|
24 |
To: goodies-lib@cs.man.ac.uk
|
|
25 |
Subject: help
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|
26 |
"
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27 |
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28 |
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30 |
SequenceableCollection subclass:#RunArray
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31 |
instanceVariableNames:'runs'
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32 |
classVariableNames:''
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33 |
poolDictionaries:''
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34 |
category:'Collections-Sequenceable'
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35 |
!
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36 |
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37 |
RunArray comment:'This implements an ordered collection which uses runs to minimise the amount
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|
38 |
of data that it holds. Basically it should be used if you know that an ordered
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|
39 |
collections is giong to contain a lot of runs of eactly the same data. Implemented
|
|
40 |
to allow simultation playback, since the ordered collctions which that generates
|
|
41 |
are so big that the complier falls over, though most of it is extremely repetetive.
|
|
42 |
This should be totally abstracted. The user should not be a ble to see the difference
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|
43 |
between an ordered collection and a ComrpessedOrderedCollection. This has a
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44 |
lot in common with RunArray, and the two should probably share implementation.
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|
45 |
but I could not do some of the things I wanted with the RunArray code, so this
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is all done on its own.
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47 |
Some of this could be made faster by adding a cache of the start and finish
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48 |
indices of each run, but since I envisage that most additions etc. will be to
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49 |
and from the end those are not included. In addition I have implemented the
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50 |
bare essentials of this for what I need it for - i.e. add to the end and take
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51 |
off the beginning.'!
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52 |
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!RunArray class methodsFor:'documentation'!
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copyright
|
|
56 |
"
|
|
57 |
This class is not covered by or part of the ST/X licence.
|
|
58 |
|
|
59 |
|
|
60 |
COPYRIGHT.
|
|
61 |
The above file is a Manchester Goodie protected by copyright.
|
|
62 |
These conditions are imposed on the whole Goodie, and on any significant
|
|
63 |
part of it which is separately transmitted or stored:
|
|
64 |
* You must ensure that every copy includes this notice, and that
|
|
65 |
source and author(s) of the material are acknowledged.
|
|
66 |
* These conditions must be imposed on anyone who receives a copy.
|
|
67 |
* The material shall not be used for commercial gain without the prior
|
|
68 |
written consent of the author(s).
|
|
69 |
Further information on the copyright conditions may be obtained by
|
|
70 |
sending electronic mail:
|
|
71 |
To: goodies-lib@cs.man.ac.uk
|
|
72 |
Subject: copyright
|
|
73 |
or by writing to The Smalltalk Goodies Library Manager, Dept of
|
|
74 |
Computer Science, The University, Manchester M13 9PL, UK
|
|
75 |
|
|
76 |
(C) Copyright 1993 University of Manchester
|
|
77 |
For more information about the Manchester Goodies Library (from which
|
|
78 |
this file was distributed) send e-mail:
|
|
79 |
To: goodies-lib@cs.man.ac.uk
|
|
80 |
Subject: help
|
|
81 |
"
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82 |
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!
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documentation
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87 |
"
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This implements an array which uses runs to minimise the amount
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of data that it holds. Basically it should be used if you know that an array
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90 |
is going to contain a lot of runs of exactly the same data.
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91 |
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92 |
The user should not be able to see the difference between an Array and a RunArray. This has a
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93 |
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94 |
Notice:
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95 |
there is only a space saving if there are really runs (i.e. multiple
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elements which compare same).
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97 |
Otherwise, an Array is more compact.
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99 |
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[author:]
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Claus Gittinger
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[see also:]
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Array OrderedCollection CompressedorderedCollection
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"
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!
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examples
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109 |
"
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this eats up a lot of memory ...
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111 |
... but its relatively fast:
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[exBegin]
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|coll|
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|
114 |
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|
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coll := OrderedCollection new.
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|
116 |
Transcript showCr:(
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Time millisecondsToRun:[
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|
118 |
100000 timesRepeat:[coll add:'hello'].
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|
119 |
100000 timesRepeat:[coll add:'world'].
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|
120 |
]
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).
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coll inspect.
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[exEnd]
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124 |
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125 |
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|
126 |
this is very space efficient ...
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|
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... but much slower:
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[exBegin]
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|coll|
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130 |
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coll := RunArray new.
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|
132 |
Transcript showCr:(
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Time millisecondsToRun:[
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134 |
100000 timesRepeat:[coll add:'hello'].
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135 |
100000 timesRepeat:[coll add:'world'].
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136 |
]
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).
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coll inspect.
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139 |
[exEnd]
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140 |
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141 |
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this is very space efficient ...
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... AND much faster:
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[exBegin]
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|coll|
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147 |
coll := RunArray new.
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|
148 |
Transcript showCr:(
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Time millisecondsToRun:[
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150 |
coll add:'hello' withCount:100000.
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|
151 |
coll add:'world' withCount:100000.
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|
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]
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).
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coll inspect.
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155 |
[exEnd]
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156 |
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157 |
|
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158 |
this is very space INEFFICIENT (a real memory pig ;-) ...
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159 |
... and much slower:
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160 |
[exBegin]
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|coll|
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|
162 |
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|
163 |
coll := RunArray new.
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|
164 |
Transcript showCr:(
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165 |
Time millisecondsToRun:[
|
|
166 |
1 to:1000 do:[:i | coll add:i].
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]
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).
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169 |
coll inspect.
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170 |
[exEnd]
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171 |
|
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172 |
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|
173 |
things like this are VERY slow:
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[exBegin]
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175 |
|coll|
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176 |
|
|
177 |
coll := RunArray new.
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|
178 |
1 to:1000 do:[:i | coll add:i].
|
|
179 |
Transcript showCr:(
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|
180 |
Time millisecondsToRun:[
|
|
181 |
1000 to:1 by:-2 do:[:i | coll removeIndex:i].
|
|
182 |
]
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|
183 |
)
|
|
184 |
[exEnd]
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185 |
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|
186 |
much faster with OCs (although these are not optimal for this, too):
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[exBegin]
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188 |
|coll|
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|
189 |
|
|
190 |
coll := OrderedCollection new.
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|
191 |
1 to:1000 do:[:i | coll add:i].
|
|
192 |
Transcript showCr:(
|
|
193 |
Time millisecondsToRun:[
|
|
194 |
1000 to:1 by:-2 do:[:i | coll removeIndex:i].
|
|
195 |
]
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)
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197 |
[exEnd]
|
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198 |
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|
199 |
in general, such things are better done by constructing a new collection
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from scratch (use #select: or #collect:)
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"
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! !
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203 |
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!RunArray class methodsFor:'instance creation'!
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new:size
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"ignore the size argument - we dont know how many runs are
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needed - anyway"
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209 |
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210 |
^ self new
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|
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! !
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212 |
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|
213 |
!RunArray methodsFor:'accessing'!
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214 |
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at:anInteger
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216 |
"Answer the element at index anInteger.
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217 |
at: is used by a knowledgeable client to access an existing element
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|
218 |
This is a pretty dumb thing to do a compressed collection and it is
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not at all efficient (think of that as a discouragement)."
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220 |
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|position "{ Class: SmallInteger }"
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|
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nRuns "{ Class: SmallInteger }"|
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|
223 |
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|
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(anInteger > 0) ifTrue:[
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|
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position := 1.
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226 |
nRuns := runs size.
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227 |
1 to:nRuns by:2 do:[:runIndex |
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|runLen|
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229 |
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230 |
runLen := runs at:runIndex.
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|
231 |
anInteger >= position ifTrue:[
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232 |
anInteger < (position + runLen) ifTrue:[
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233 |
^ runs at:(runIndex + 1)
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].
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].
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|
236 |
position := position + runLen
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|
237 |
]
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].
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|
239 |
^ self errorInvalidKey:anInteger
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|
240 |
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241 |
"
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|c|
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243 |
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|
244 |
c := RunArray new.
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|
245 |
c add:1; add:1; add:1; add:2; add:2; add:3; add:3; add:4; add:5.
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246 |
c at:1.
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247 |
c at:2.
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c at:3.
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c at:4.
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c at:5.
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c at:6.
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c at:7.
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c at:8.
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c at:9.
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c at:10.
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256 |
"
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257 |
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258 |
"Modified: 10.5.1996 / 16:59:03 / cg"
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259 |
!
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|
260 |
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261 |
at:index put:anObject
|
|
262 |
"Put anObject at element index anInteger.
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263 |
at:put: can not be used to append, front or back, to an ordered
|
|
264 |
collection; it is used by a knowledgeable client to replace an
|
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265 |
element. It doesn't make a lot of sense for a compressed collection,
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266 |
and as you can see, the implementation is awful - still if you will
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267 |
insist on using this what can you expect. Basically this just copies
|
|
268 |
itself up to the start point then adds the required element then
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269 |
copies the rest of itself"
|
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270 |
|
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271 |
|runSz runIndex runOffset len l1 l2 prevIdx nextIdx
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|
272 |
val newRuns newValues prevLen prevVal nextLen nextVal idx|
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273 |
|
|
274 |
runSz := runs size.
|
|
275 |
|
|
276 |
runIndex := nil.
|
|
277 |
(index > 0) ifTrue:[
|
|
278 |
runOffset := 1.
|
|
279 |
idx := 1.
|
|
280 |
[runIndex isNil and:[idx < runSz]] whileTrue:[
|
|
281 |
len := runs at:idx.
|
|
282 |
nextIdx := runOffset + len.
|
|
283 |
index >= runOffset ifTrue:[
|
|
284 |
index < nextIdx ifTrue:[
|
|
285 |
runIndex := idx.
|
|
286 |
nextIdx := runOffset. "/ dont advance
|
|
287 |
].
|
|
288 |
].
|
|
289 |
runOffset := nextIdx.
|
|
290 |
idx := idx + 2.
|
|
291 |
]
|
|
292 |
].
|
|
293 |
runIndex isNil ifTrue:[
|
|
294 |
^ self errorInvalidKey:index
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|
295 |
].
|
|
296 |
|
|
297 |
val := runs at:(runIndex + 1).
|
|
298 |
|
|
299 |
"/ easiest: value there is the same ...
|
|
300 |
|
|
301 |
val = anObject ifTrue:[
|
|
302 |
^ anObject
|
|
303 |
].
|
|
304 |
|
|
305 |
"/ if the length is 1, this is an island ...
|
|
306 |
"/ ... which is either easy, or requires a merge.
|
|
307 |
|
|
308 |
len := runs at:runIndex.
|
|
309 |
len = 1 ifTrue:[
|
|
310 |
"/ check if it can be merged into the next or previous run
|
|
311 |
|
|
312 |
runIndex > 1 ifTrue:[
|
|
313 |
prevIdx := runIndex - 2.
|
|
314 |
prevVal := runs at:(prevIdx + 1).
|
|
315 |
prevVal = anObject ifTrue:[
|
|
316 |
"/ can merge it into previous
|
|
317 |
|
|
318 |
prevLen := runs at:prevIdx.
|
|
319 |
|
|
320 |
"/ check if merge into next is also possible (filling an island)
|
|
321 |
|
|
322 |
runIndex < (runSz - 1) ifTrue:[
|
|
323 |
nextIdx := runIndex + 2.
|
|
324 |
nextVal := runs at:(nextIdx + 1).
|
|
325 |
nextVal = anObject ifTrue:[
|
|
326 |
"/ can merge with both.
|
|
327 |
|
|
328 |
nextLen := runs at:nextIdx.
|
|
329 |
|
|
330 |
runs at:prevIdx put:prevLen+nextLen+1.
|
|
331 |
runSz := (runSz - 4).
|
|
332 |
newRuns := Array new:runSz.
|
|
333 |
newRuns replaceFrom:1 to:(prevIdx + 1) with:runs startingAt:1.
|
|
334 |
newRuns replaceFrom:runIndex to:runSz with:runs startingAt:nextIdx+2.
|
|
335 |
runs := newRuns.
|
|
336 |
^ anObject
|
|
337 |
]
|
|
338 |
].
|
|
339 |
|
|
340 |
runs at:prevIdx put:prevLen+1.
|
|
341 |
|
|
342 |
runSz := (runSz - 2).
|
|
343 |
newRuns := Array new:runSz.
|
|
344 |
newRuns replaceFrom:1 to:(runIndex - 1) with:runs startingAt:1.
|
|
345 |
newRuns replaceFrom:runIndex to:runSz with:runs startingAt:runIndex+2.
|
|
346 |
runs := newRuns.
|
|
347 |
|
|
348 |
^ anObject
|
|
349 |
].
|
|
350 |
].
|
|
351 |
|
|
352 |
"/ check if merge into next is possible
|
|
353 |
|
|
354 |
runIndex < runSz ifTrue:[
|
|
355 |
nextIdx := runIndex + 2.
|
|
356 |
nextVal := runs at:nextIdx+1.
|
|
357 |
nextVal = anObject ifTrue:[
|
|
358 |
nextLen := runs at:nextIdx.
|
|
359 |
runs at:nextIdx put:nextLen + 1.
|
|
360 |
|
|
361 |
runSz := (runSz - 2).
|
|
362 |
newRuns := Array new:runSz.
|
|
363 |
newRuns replaceFrom:1 to:(runIndex - 1) with:runs startingAt:1.
|
|
364 |
newRuns replaceFrom:runIndex to:runSz with:runs startingAt:nextIdx.
|
|
365 |
runs := newRuns.
|
|
366 |
^ anObject
|
|
367 |
].
|
|
368 |
].
|
|
369 |
|
|
370 |
"/ no merge; island remains
|
|
371 |
|
|
372 |
runs at:(runIndex+1) put:anObject.
|
|
373 |
^ anObject
|
|
374 |
].
|
|
375 |
|
|
376 |
runOffset == index ifTrue:[
|
|
377 |
"/ at the beginning of that run ...
|
|
378 |
|
|
379 |
"/ check if its better added to the previous run ...
|
|
380 |
|
|
381 |
runIndex > 1 ifTrue:[
|
|
382 |
prevIdx := runIndex - 2.
|
|
383 |
prevVal := runs at:prevIdx+1.
|
|
384 |
prevVal = anObject ifTrue:[
|
|
385 |
prevLen := runs at:prevIdx.
|
|
386 |
runs at:prevIdx put:prevLen + 1.
|
|
387 |
runs at:runIndex put:len - 1.
|
|
388 |
^ anObject.
|
|
389 |
].
|
|
390 |
].
|
|
391 |
|
|
392 |
"/ must cut off 1 & insert a new run before ..
|
|
393 |
|
|
394 |
runs at:runIndex put:len - 1.
|
|
395 |
|
|
396 |
runSz := (runSz + 2).
|
|
397 |
newRuns := Array new:runSz.
|
|
398 |
newRuns replaceFrom:1 to:(runIndex - 1) with:runs startingAt:1.
|
|
399 |
newRuns replaceFrom:runIndex+2 to:runSz with:runs startingAt:runIndex.
|
|
400 |
runs := newRuns.
|
|
401 |
|
|
402 |
runs at:runIndex put:1.
|
|
403 |
runs at:runIndex+1 put:anObject.
|
|
404 |
^ anObject
|
|
405 |
].
|
|
406 |
|
|
407 |
(runOffset + len - 1) == index ifTrue:[
|
|
408 |
"/ at the end ...
|
|
409 |
|
|
410 |
"/ check if its better added to the next run ...
|
|
411 |
|
|
412 |
runIndex < runSz ifTrue:[
|
|
413 |
nextIdx := runIndex + 2.
|
|
414 |
nextVal := runs at:nextIdx+1.
|
|
415 |
nextVal = anObject ifTrue:[
|
|
416 |
nextLen := runs at:nextIdx.
|
|
417 |
runs at:nextIdx put:nextLen + 1.
|
|
418 |
runs at:runIndex put:len - 1.
|
|
419 |
^ anObject.
|
|
420 |
].
|
|
421 |
].
|
|
422 |
|
|
423 |
"/ must cut off 1 & insert a new run after ..
|
|
424 |
|
|
425 |
runs at:runIndex put:len - 1.
|
|
426 |
|
|
427 |
runSz := (runSz + 2).
|
|
428 |
newRuns := Array new:runSz.
|
|
429 |
newRuns replaceFrom:1 to:(runIndex + 1) with:runs startingAt:1.
|
|
430 |
newRuns replaceFrom:runIndex+4 to:runSz with:runs startingAt:runIndex+2.
|
|
431 |
runs := newRuns.
|
|
432 |
|
|
433 |
runs at:runIndex+2 put:1.
|
|
434 |
runs at:runIndex+2+1 put:anObject.
|
|
435 |
^ anObject
|
|
436 |
].
|
|
437 |
|
|
438 |
"/ hardest - split run into two, insert new run in-between
|
|
439 |
|
|
440 |
runSz := (runSz + 4).
|
|
441 |
newRuns := Array new:runSz.
|
|
442 |
|
|
443 |
runIndex > 1 ifTrue:[
|
|
444 |
newRuns replaceFrom:1 to:runIndex-1 with:runs.
|
|
445 |
].
|
|
446 |
newRuns replaceFrom:runIndex+6 to:(runSz+4) with:runs startingAt:runIndex+2.
|
|
447 |
|
|
448 |
l2 := len - (index - runOffset).
|
|
449 |
l1 := len - l2.
|
|
450 |
l2 := l2 - 1.
|
|
451 |
|
|
452 |
newRuns at:runIndex put:l1.
|
|
453 |
newRuns at:runIndex+1 put:val.
|
|
454 |
|
|
455 |
newRuns at:runIndex+4 put:l2.
|
|
456 |
newRuns at:runIndex+5 put:val.
|
|
457 |
|
|
458 |
"/ insert
|
|
459 |
newRuns at:runIndex+2 put:1.
|
|
460 |
newRuns at:runIndex+3 put:anObject.
|
|
461 |
|
|
462 |
runs := newRuns.
|
|
463 |
^ anObject
|
|
464 |
|
|
465 |
"
|
|
466 |
|c|
|
|
467 |
|
|
468 |
Transcript cr.
|
|
469 |
|
|
470 |
c := RunArray new.
|
|
471 |
c add:1; add:1; add:1; add:2; add:2; add:3; add:3; add:4; add:5; yourself.
|
|
472 |
Transcript showCr:c.
|
|
473 |
|
|
474 |
c at:1 put:$a.
|
|
475 |
Transcript showCr:c.
|
|
476 |
c.
|
|
477 |
|
|
478 |
c at:3 put:$a.
|
|
479 |
Transcript showCr:c.
|
|
480 |
c.
|
|
481 |
|
|
482 |
c at:4 put:$a.
|
|
483 |
Transcript showCr:c.
|
|
484 |
c.
|
|
485 |
|
|
486 |
c at:5 put:$a.
|
|
487 |
Transcript showCr:c.
|
|
488 |
c.
|
|
489 |
|
|
490 |
c at:2 put:$0.
|
|
491 |
Transcript showCr:c.
|
|
492 |
c.
|
|
493 |
|
|
494 |
c at:2 put:$a.
|
|
495 |
Transcript showCr:c.
|
|
496 |
c.
|
|
497 |
|
|
498 |
Transcript showCr:c.
|
|
499 |
"
|
|
500 |
|
|
501 |
"Modified: 11.5.1996 / 08:41:49 / cg"
|
|
502 |
!
|
|
503 |
|
|
504 |
size
|
|
505 |
"Answer how many elements the receiver contains."
|
|
506 |
|
|
507 |
|n "{ Class: SmallInteger }"
|
|
508 |
runSz "{ Class: SmallInteger }"|
|
|
509 |
|
|
510 |
n := 0.
|
|
511 |
runSz := runs size.
|
|
512 |
1 to:runSz by:2 do:[:i |
|
|
513 |
n := n + (runs at:i)
|
|
514 |
].
|
|
515 |
^ n
|
|
516 |
! !
|
|
517 |
|
|
518 |
!RunArray methodsFor:'adding'!
|
|
519 |
|
|
520 |
add:newObject
|
|
521 |
"add newObject at the end; returns the object (sigh)"
|
|
522 |
|
|
523 |
^ self add:newObject withOccurrences:1.
|
|
524 |
|
|
525 |
"
|
|
526 |
|c|
|
|
527 |
|
|
528 |
c := RunArray new.
|
|
529 |
c add:1; add:1; add:1; add:2; add:2; add:3; add:3; add:4; add:5; yourself.
|
|
530 |
"
|
|
531 |
|
|
532 |
"Modified: 10.5.1996 / 17:01:20 / cg"
|
|
533 |
!
|
|
534 |
|
|
535 |
add:newObject withOccurrences:n
|
|
536 |
"add newObject n times at the end; returns the object (sigh)"
|
|
537 |
|
|
538 |
|lastIdx runSz newRuns|
|
|
539 |
|
|
540 |
runs notNil ifTrue:[
|
|
541 |
"/ check for merge
|
|
542 |
|
|
543 |
runSz := runs size.
|
|
544 |
|
|
545 |
(runs at:runSz) = newObject ifTrue:[
|
|
546 |
lastIdx := runSz - 1.
|
|
547 |
runs at:lastIdx put:(runs at:lastIdx) + n.
|
|
548 |
^ newObject
|
|
549 |
].
|
|
550 |
|
|
551 |
newRuns := Array new:(runSz + 2).
|
|
552 |
newRuns replaceFrom:1 to:runSz with:runs.
|
|
553 |
newRuns at:runSz+1 put:n.
|
|
554 |
newRuns at:runSz+2 put:newObject.
|
|
555 |
runs := newRuns.
|
|
556 |
] ifFalse:[
|
|
557 |
runs := Array with:n with:newObject.
|
|
558 |
].
|
|
559 |
^ newObject
|
|
560 |
|
|
561 |
"
|
|
562 |
|c|
|
|
563 |
|
|
564 |
c := RunArray new.
|
|
565 |
c add:1 withOccurrences:1000; yourself.
|
|
566 |
c add:2 withOccurrences:1000; yourself.
|
|
567 |
"
|
|
568 |
|
|
569 |
"Modified: 10.5.1996 / 18:29:56 / cg"
|
|
570 |
!
|
|
571 |
|
|
572 |
grow:howBig
|
|
573 |
"grow or shrink the receiver to contain howBig elements.
|
|
574 |
If growing, new slots will be filled with nil."
|
|
575 |
|
|
576 |
|sz info runIndex runOffset runSz newRuns|
|
|
577 |
|
|
578 |
sz := self size.
|
|
579 |
|
|
580 |
howBig == sz ifTrue:[^ self].
|
|
581 |
|
|
582 |
howBig == 0 ifTrue:[
|
|
583 |
runs := nil.
|
|
584 |
^ self.
|
|
585 |
].
|
|
586 |
|
|
587 |
runs isNil ifTrue:[
|
|
588 |
runs := Array with:howBig with:nil.
|
|
589 |
^ self
|
|
590 |
].
|
|
591 |
|
|
592 |
runSz := runs size.
|
|
593 |
|
|
594 |
howBig > sz ifTrue:[
|
|
595 |
newRuns := Array new:(runSz + 2).
|
|
596 |
newRuns replaceFrom:1 to:runSz with:runs startingAt:1.
|
|
597 |
newRuns at:(runSz+1) put:(howBig - sz).
|
|
598 |
runs := newRuns.
|
|
599 |
^ self
|
|
600 |
].
|
|
601 |
|
|
602 |
"/ shrinking; possibly cut of a run
|
|
603 |
|
|
604 |
info := self runIndexAndStartIndexForIndex:howBig.
|
|
605 |
runIndex := info at:1.
|
|
606 |
runOffset := info at:2.
|
|
607 |
|
|
608 |
howBig == (runOffset - 1) ifTrue:[
|
|
609 |
"/ we are lucky - new size is up-to previous run
|
|
610 |
|
|
611 |
runs := runs copyFrom:1 to:runIndex-1.
|
|
612 |
] ifFalse:[
|
|
613 |
runs := runs copyFrom:1 to:(runIndex+1).
|
|
614 |
runs at:runIndex put:(howBig - runOffset + 1)
|
|
615 |
].
|
|
616 |
|
|
617 |
"
|
|
618 |
|c|
|
|
619 |
|
|
620 |
c := RunArray new.
|
|
621 |
c addAll:#(1 2 3 4 4 4 4 5 5 5 1 2 3); yourself.
|
|
622 |
|
|
623 |
c grow:50; yourself.
|
|
624 |
|
|
625 |
c grow:7; yourself.
|
|
626 |
|
|
627 |
c grow:6; yourself.
|
|
628 |
|
|
629 |
c grow:0; yourself.
|
|
630 |
"
|
|
631 |
|
|
632 |
"Modified: 10.5.1996 / 18:11:54 / cg"
|
|
633 |
! !
|
|
634 |
|
|
635 |
!RunArray methodsFor:'converting'!
|
|
636 |
|
|
637 |
asOrderedCollection
|
|
638 |
"Uncompress this collection."
|
|
639 |
|
|
640 |
|newCollection|
|
|
641 |
|
|
642 |
newCollection := OrderedCollection new.
|
|
643 |
newCollection addAll:self.
|
|
644 |
^ newCollection
|
|
645 |
|
|
646 |
"Modified: 10.5.1996 / 13:31:49 / cg"
|
|
647 |
! !
|
|
648 |
|
|
649 |
!RunArray methodsFor:'enumerating'!
|
|
650 |
|
|
651 |
do:aBlock
|
|
652 |
"Evaluate aBlock with each of the receiver's elements as the
|
|
653 |
argument. "
|
|
654 |
|
|
655 |
runs notNil ifTrue:[
|
|
656 |
runs pairWiseDo:[:len :val |
|
|
657 |
len timesRepeat: [aBlock value:val]
|
|
658 |
]
|
|
659 |
]
|
|
660 |
|
|
661 |
"Modified: 10.5.1996 / 16:56:01 / cg"
|
|
662 |
! !
|
|
663 |
|
|
664 |
!RunArray methodsFor:'printing'!
|
|
665 |
|
|
666 |
storeOn:aStream
|
|
667 |
"Append to aStream an expression which, if evaluated, will generate
|
|
668 |
an object similar to the receiver."
|
|
669 |
|
|
670 |
aStream nextPutAll: '(RunArray new'.
|
|
671 |
runs notNil ifTrue:[
|
|
672 |
runs pairWiseDo:[:len :val |
|
|
673 |
aStream nextPutAll: ' add:'; nextPutAll:val storeString.
|
|
674 |
len == 1 ifFalse:[
|
|
675 |
aStream nextPutAll:' withCount:'; nextPutAll:len printString.
|
|
676 |
].
|
|
677 |
aStream nextPutAll:';'
|
|
678 |
].
|
|
679 |
aStream nextPutAll:' yourself'
|
|
680 |
].
|
|
681 |
aStream nextPutAll:')'
|
|
682 |
|
|
683 |
"
|
|
684 |
(RunArray new
|
|
685 |
add:1;
|
|
686 |
add:1;
|
|
687 |
add:2;
|
|
688 |
add:3;
|
|
689 |
add:4 withCount:100;
|
|
690 |
add:5;
|
|
691 |
yourself) storeString
|
|
692 |
|
|
693 |
RunArray new storeString
|
|
694 |
"
|
|
695 |
! !
|
|
696 |
|
|
697 |
!RunArray methodsFor:'private'!
|
|
698 |
|
|
699 |
find:oldObject
|
|
700 |
"If I contain oldObject return its index, otherwise create an error
|
|
701 |
notifier. It will answer with the position of the very first element of
|
|
702 |
that value."
|
|
703 |
|
|
704 |
|position|
|
|
705 |
|
|
706 |
position := self find:oldObject ifAbsent:0.
|
|
707 |
position ~~ 0 ifTrue:[
|
|
708 |
^ position
|
|
709 |
].
|
|
710 |
|
|
711 |
self errorValueNotFound:oldObject
|
|
712 |
|
|
713 |
"
|
|
714 |
|c|
|
|
715 |
|
|
716 |
c := RunArray new.
|
|
717 |
c add:1; add:1; add:1; add:2; add:2; add:3; add:3; add:4; add:5.
|
|
718 |
c find:2.
|
|
719 |
|
|
720 |
c find:99
|
|
721 |
"
|
|
722 |
|
|
723 |
"Modified: 10.5.1996 / 13:39:58 / cg"
|
|
724 |
!
|
|
725 |
|
|
726 |
find:oldObject ifAbsent:exceptionBlock
|
|
727 |
"If I contain oldObject return its index, otherwise execute the
|
|
728 |
exception block. It will answer with the position of the very first
|
|
729 |
element of that value."
|
|
730 |
|
|
731 |
|position|
|
|
732 |
|
|
733 |
position := 1.
|
|
734 |
runs notNil ifTrue:[
|
|
735 |
runs pairWiseDo:[:len :val |
|
|
736 |
val = oldObject ifTrue:[
|
|
737 |
^ position
|
|
738 |
].
|
|
739 |
position := position + len.
|
|
740 |
].
|
|
741 |
].
|
|
742 |
^ exceptionBlock value
|
|
743 |
|
|
744 |
"Modified: 10.5.1996 / 13:54:25 / cg"
|
|
745 |
!
|
|
746 |
|
|
747 |
isEmpty
|
|
748 |
"Am I empty or not. Returns a boolean"
|
|
749 |
|
|
750 |
^ runs notNil
|
|
751 |
!
|
|
752 |
|
|
753 |
runIndexAndStartIndexForIndex:anIndex
|
|
754 |
"given a logical index, find the index of that run and the logical index
|
|
755 |
of the first item in that run."
|
|
756 |
|
|
757 |
|position nRuns "{ Class: SmallInteger }"|
|
|
758 |
|
|
759 |
position := 1.
|
|
760 |
nRuns := runs size.
|
|
761 |
1 to:nRuns by:2 do:[:runIndex |
|
|
762 |
|runLen runLast|
|
|
763 |
|
|
764 |
runLen := runs at:runIndex.
|
|
765 |
anIndex >= position ifTrue:[
|
|
766 |
runLast := position + runLen - 1.
|
|
767 |
anIndex <= runLast ifTrue:[
|
|
768 |
^ Array with:runIndex with:position
|
|
769 |
].
|
|
770 |
].
|
|
771 |
position := position + runLen
|
|
772 |
].
|
|
773 |
|
|
774 |
^ #(0 0)
|
|
775 |
|
|
776 |
"Created: 10.5.1996 / 17:12:28 / cg"
|
|
777 |
"Modified: 10.5.1996 / 17:13:42 / cg"
|
|
778 |
!
|
|
779 |
|
|
780 |
runIndexForIndex:anIndex
|
|
781 |
"given a logical index, find the index of that run"
|
|
782 |
|
|
783 |
^ (self runIndexAndStartIndexForIndex:anIndex) at:1
|
|
784 |
|
|
785 |
"Modified: 10.5.1996 / 17:13:45 / cg"
|
|
786 |
! !
|
|
787 |
|
|
788 |
!RunArray methodsFor:'user interface'!
|
|
789 |
|
|
790 |
inspect
|
|
791 |
"Reimplement so that they don't get an ordered collection inspector
|
|
792 |
which would get very confused."
|
|
793 |
|
|
794 |
self basicInspect
|
|
795 |
|
|
796 |
"Modified: 10.5.1996 / 18:24:43 / cg"
|
|
797 |
! !
|
|
798 |
|
|
799 |
!RunArray class methodsFor:'documentation'!
|
|
800 |
|
|
801 |
version
|
|
802 |
^ '$Header: /cvs/stx/stx/libbasic2/RunArray.st,v 1.1 1996-05-11 10:47:55 cg Exp $'
|
|
803 |
! !
|