-
-
Notifications
You must be signed in to change notification settings - Fork 354
/
RunArray.class.st
783 lines (680 loc) · 21.1 KB
/
RunArray.class.st
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
"
My instances provide space-efficient storage of data which tends to be constant over long runs of the possible indices. Essentially repeated values are stored singly and then associated with a ""run"" length that denotes the number of consecutive occurrences of the value.
My two important variables are
runs An array of how many elements are in each run
values An array of what the value is over those elements
The variables lastIndex, lastRun and lastOffset cache the last access
so that streaming through RunArrays is not an N-squared process.
Many complexities of access can be bypassed by using the method
RunArray withStartStopAndValueDo:
"
Class {
#name : #RunArray,
#superclass : #SequenceableCollection,
#instVars : [
'runs',
'values',
'lastIndex',
'lastRun',
'lastOffset'
],
#category : #'Text-Core-Utilities'
}
{ #category : #'instance creation' }
RunArray class >> new [
^self runs: Array new values: Array new
]
{ #category : #'instance creation' }
RunArray class >> new: aSize [
^ self new: aSize withAll: nil
]
{ #category : #'instance creation' }
RunArray class >> new: size withAll: value [
"Answer a new instance of me, whose every element is equal to the
argument, value."
size = 0 ifTrue: [^self new].
^self runs: (Array with: size) values: (Array with: value)
]
{ #category : #'instance creation' }
RunArray class >> newFrom: aCollection [
"Answer an instance of me containing the same elements as aCollection."
| runs values lastRun lastValue |
runs := (Array new: aCollection size // 2) writeStream.
values := (Array new: aCollection size // 2) writeStream.
lastRun := 0.
lastValue := Object new.
aCollection do: [:x |
lastValue = x
ifTrue: [lastRun := lastRun + 1]
ifFalse:
[lastRun > 0
ifTrue:
[runs nextPut: lastRun.
values nextPut: lastValue].
lastRun := 1.
lastValue := x]].
lastRun > 0
ifTrue:
[runs nextPut: lastRun.
values nextPut: lastValue].
^self basicNew setRuns: runs contents setValues: values contents
" RunArray newFrom: {1. 2. 2. 3}
{1. $a. $a. 3} as: RunArray
({1. $a. $a. 3} as: RunArray) values
"
]
{ #category : #'instance creation' }
RunArray class >> readFrom: aStream [
"Answer an instance of me as described on the stream, aStream."
| size runs values |
size := aStream nextWord.
runs := Array new: size.
values := Array new: size.
1 to: size do:
[:x |
runs at: x put: aStream nextWord.
values at: x put: aStream nextWord].
^ self runs: runs values: values
]
{ #category : #'instance creation' }
RunArray class >> runs: newRuns values: newValues [
"Answer an instance of me with runs and values specified by the
arguments."
| instance |
instance := self basicNew.
instance setRuns: newRuns setValues: newValues.
^instance
]
{ #category : #'instance creation' }
RunArray class >> scanFrom: strm [
"Read the style section of a fileOut or sources file. nextChunk has already been done. We need to return a RunArray of TextAttributes of various kinds. These are written by the implementors of writeScanOn:"
| runs values attrList char |
(strm peekFor: $( ) ifFalse: [^ nil].
runs := OrderedCollection new.
[strm skipSeparators.
strm peekFor: $)] whileFalse:
[runs add: (Number readFrom: strm)].
values := OrderedCollection new. "Value array"
attrList := OrderedCollection new. "Attributes list"
[(char := strm next) == nil] whileFalse: [
char == $, ifTrue: [values add: attrList asArray. attrList := OrderedCollection new].
char == $a ifTrue: [attrList add:
(TextAlignment new alignment: (Integer readFrom: strm ifFail: [0]))].
char == $f ifTrue: [attrList add:
(TextFontChange new fontNumber: (Integer readFrom: strm ifFail: [0]))].
char == $F ifTrue: [attrList add: (TextFontReference toFont:
(Smalltalk at: #StrikeFont ifPresent: [:sf | sf familyName: (strm upTo: $#) size: (Integer readFrom: strm ifFail: [0])]))].
char == $b ifTrue: [attrList add: (TextEmphasis bold)].
char == $i ifTrue: [attrList add: (TextEmphasis italic)].
char == $u ifTrue: [attrList add: (TextEmphasis underlined)].
char == $= ifTrue: [attrList add: (TextEmphasis struckOut)].
char == $n ifTrue: [attrList add: (TextEmphasis normal)].
char == $- ifTrue: [attrList add: (TextKern kern: -1)].
char == $+ ifTrue: [attrList add: (TextKern kern: 1)].
char == $c ifTrue: [attrList add: (TextColor scanFrom: strm)]. "color"
char == $L ifTrue: [attrList add: (TextLink scanFrom: strm)]. "L not look like 1"
char == $R ifTrue: [attrList add: (TextURL scanFrom: strm)].
"R capitalized so it can follow a number"
char == $P ifTrue: [attrList add: (TextPrintIt scanFrom: strm)].
char == $d ifTrue: [attrList add: (TextDoIt scanFrom: strm)].
"space, cr do nothing"
].
values add: attrList asArray.
^ self runs: runs asArray values: (values copyFrom: 1 to: runs size) asArray
"
RunArray scanFrom: (ReadStream on: '(14 50 312)f1,f1b,f1LInteger +;i')
"
]
{ #category : #copying }
RunArray >> , aRunArray [
"Answer a new RunArray that is a concatenation of the receiver and
aRunArray."
| new newRuns |
(aRunArray isMemberOf: RunArray)
ifFalse:
[new := self copy.
"attempt to be sociable"
aRunArray do: [:each | new addLast: each].
^new].
runs size = 0 ifTrue: [^aRunArray copy].
aRunArray runs size = 0 ifTrue: [^self copy].
(values at: values size) ~= (aRunArray values at: 1)
ifTrue: [^RunArray
runs: runs , aRunArray runs
values: values , aRunArray values].
newRuns := runs
copyReplaceFrom: runs size
to: runs size
with: aRunArray runs.
newRuns at: runs size put: (runs at: runs size) + (aRunArray runs at: 1).
^RunArray
runs: newRuns
values:
(values
copyReplaceFrom: values size
to: values size
with: aRunArray values)
]
{ #category : #comparing }
RunArray >> = otherArray [
"Test if all my elements are equal to those of otherArray"
self == otherArray ifTrue: [^true].
self species == otherArray species ifFalse: [^ false].
(otherArray isMemberOf: RunArray) ifFalse: [^ self hasEqualElements: otherArray].
"Faster test between two RunArrays"
^ (runs hasEqualElements: otherArray runs)
and: [values hasEqualElements: otherArray values]
]
{ #category : #adding }
RunArray >> add: newObject withOccurrences: anInteger [
"Add value as the last element of the receiver, the given number of times"
anInteger <= 0 ifTrue: [ ^self ].
lastIndex := nil. "flush access cache"
(runs size=0 or: [values last ~= newObject])
ifTrue:
[runs := runs copyWith: anInteger.
values := values copyWith: newObject]
ifFalse:
[runs at: runs size put: runs last + anInteger]
]
{ #category : #adding }
RunArray >> addFirst: value [
"Add value as the first element of the receiver."
lastIndex := nil. "flush access cache"
(runs size=0 or: [values first ~= value])
ifTrue:
[runs := {1}, runs.
values := {value}, values]
ifFalse:
[runs at: 1 put: runs first+1]
]
{ #category : #adding }
RunArray >> addLast: value [
"Add value as the last element of the receiver."
lastIndex := nil. "flush access cache"
(runs size=0 or: [values last ~= value])
ifTrue:
[runs := runs copyWith: 1.
values := values copyWith: value]
ifFalse:
[runs at: runs size put: runs last+1].
^value
]
{ #category : #enumerating }
RunArray >> allSatisfy: aBlock [
"Only evaluate once per run"
^values allSatisfy: aBlock
]
{ #category : #enumerating }
RunArray >> anySatisfy: aBlock [
"Only evaluate once per run"
^values anySatisfy: aBlock
]
{ #category : #converting }
RunArray >> asBag [
| aBag |
aBag := Bag new: values size.
self runsAndValuesDo: [:run :value |
aBag add: value withOccurrences: run].
^aBag
]
{ #category : #converting }
RunArray >> asSet [
^values asSet
]
{ #category : #accessing }
RunArray >> at: index [
self at: index setRunOffsetAndValue: [:run :offset :value | ^value]
]
{ #category : #accessing }
RunArray >> at: index put: aValue [
"Set an element of the RunArray"
| runIndex offsetInRun lastValue runLength runReplacement valueReplacement iStart iStop |
index isInteger
ifFalse: [ self errorNonIntegerIndex ].
(index between: 1 and: self size)
ifFalse: [ self errorSubscriptBounds: index ].
self
at: index
setRunOffsetAndValue: [ :run :offset :value |
runIndex := run.
offsetInRun := offset.
lastValue := value ].
aValue = lastValue
ifTrue: [ ^ aValue ].
runLength := runs at: runIndex.
runReplacement := Array with: offsetInRun with: 1 with: runLength - offsetInRun - 1.
valueReplacement := Array with: lastValue with: aValue with: lastValue.
iStart := offsetInRun = 0
ifTrue: [ 2 ]
ifFalse: [ 1 ].
iStop := offsetInRun = (runLength - 1)
ifTrue: [ 2 ]
ifFalse: [ 3 ].
self
setRuns: (runs copyReplaceFrom: runIndex to: runIndex with: (runReplacement copyFrom: iStart to: iStop))
setValues: (values copyReplaceFrom: runIndex to: runIndex with: (valueReplacement copyFrom: iStart to: iStop)).
self coalesce.
^ aValue
]
{ #category : #private }
RunArray >> at: index setRunOffsetAndValue: aBlock [
"Supply all run information to aBlock."
"Tolerates index=0 and index=size+1 for copyReplace: "
| run limit offset |
limit := runs size.
(lastIndex == nil or: [index < lastIndex])
ifTrue: "cache not loaded, or beyond index - start over"
[run := 1.
offset := index-1]
ifFalse: "cache loaded and before index - start at cache"
[run := lastRun.
offset := lastOffset + (index-lastIndex)].
[run <= limit and: [offset >= (runs at: run)]]
whileTrue:
[offset := offset - (runs at: run).
run := run + 1].
lastIndex := index. "Load cache for next access"
lastRun := run.
lastOffset := offset.
run > limit
ifTrue:
["adjustment for size+1"
run := run - 1.
offset := offset + (runs at: run)].
^aBlock
value: run "an index into runs and values"
value: offset "zero-based offset from beginning of this run"
value: (values at: run) "value for this run"
]
{ #category : #adding }
RunArray >> coalesce [
"Try to combine adjacent runs"
| ind |
ind := 2.
[ind > values size] whileFalse: [
(values at: ind-1) = (values at: ind)
ifFalse: [ind := ind + 1]
ifTrue: ["two are the same, combine them"
values := values copyReplaceFrom: ind to: ind with: #().
runs at: ind-1 put: (runs at: ind-1) + (runs at: ind).
runs := runs copyReplaceFrom: ind to: ind with: #().
"self error: 'needed to combine runs' "]].
]
{ #category : #enumerating }
RunArray >> collect: aBlock [
"Beware, the block will be evaluated only once per group of values."
^(self class runs: runs copy contents values: (values collect: aBlock)) coalesce
]
{ #category : #copying }
RunArray >> copyFrom: start to: stop [
| newRuns run1 run2 offset1 offset2 |
stop < start ifTrue: [^RunArray new].
self at: start setRunOffsetAndValue: [:r :o :value1 | run1 := r. offset1 := o. value1].
self at: stop setRunOffsetAndValue: [:r :o :value2 | run2 := r. offset2 := o. value2].
run1 = run2
ifTrue:
[newRuns := Array with: offset2 - offset1 + 1]
ifFalse:
[newRuns := runs copyFrom: run1 to: run2.
newRuns at: 1 put: (newRuns at: 1) - offset1.
newRuns at: newRuns size put: offset2 + 1].
^RunArray runs: newRuns values: (values copyFrom: run1 to: run2)
]
{ #category : #copying }
RunArray >> copyReplaceFrom: start to: stop with: replacement [
^(self copyFrom: 1 to: start - 1)
, replacement
, (self copyFrom: stop + 1 to: self size)
]
{ #category : #copying }
RunArray >> copyUpThrough: anElement [
"Optimized"
| newValues |
newValues := values copyUpThrough: anElement.
^ self class
runs: (runs copyFrom: 1 to: newValues size)
values: newValues
]
{ #category : #copying }
RunArray >> copyUpTo: anElement [
"Optimized"
| newValues |
newValues := values copyUpTo: anElement.
^ self class
runs: (runs copyFrom: 1 to: newValues size)
values: newValues
]
{ #category : #copying }
RunArray >> copyUpToLast: anElement [
"Optimized"
| newValues |
newValues := values copyUpToLast: anElement.
^ self class
runs: (runs copyFrom: 1 to: newValues size)
values: newValues
]
{ #category : #enumerating }
RunArray >> count: aBlock [
"Beware, the block will be evaluated only once per group of values."
| count |
count := 0.
self runsAndValuesDo: [:run :value |
(aBlock value: value)
ifTrue:
[count := count + run]].
^count
]
{ #category : #enumerating }
RunArray >> detect: aBlock ifNone: exceptionBlock [
"Only evaluate once per run"
^values detect: aBlock ifNone: exceptionBlock
]
{ #category : #enumerating }
RunArray >> detectMax: aBlock [
"Only evaluate once per run"
^values detectMax: aBlock
]
{ #category : #enumerating }
RunArray >> detectMin: aBlock [
"Only evaluate once per run"
^values detectMin: aBlock
]
{ #category : #enumerating }
RunArray >> detectSum: aBlock [
"Only loop on runs"
| sum |
sum := 0.
self runsAndValuesDo: [:run :value |
sum := (aBlock value: value) * run + sum].
^ sum
]
{ #category : #enumerating }
RunArray >> do: aBlock [
"This is refined for speed"
1 to: runs size do: [:i |
| r v |
v := values at: i.
r := runs at: i.
[( r := r - 1) >= 0]
whileTrue: [aBlock value: v]].
]
{ #category : #private }
RunArray >> fillFrom: aCollection with: aBlock [
"Evaluate aBlock with each of aCollection's elements as the argument.
Collect the resulting values into self. Answer self."
| newRuns newValues lastLength lastValue |
newRuns := (Array new: aCollection size) writeStream.
newValues := (Array new: aCollection size) writeStream.
lastLength := 0.
lastValue := Object new.
aCollection do: [:each |
| value |
value := aBlock value: each.
lastValue = value
ifTrue: [lastLength := lastLength + 1]
ifFalse:
[lastLength > 0
ifTrue:
[newRuns nextPut: lastLength.
newValues nextPut: lastValue].
lastLength := 1.
lastValue := value]].
lastLength > 0
ifTrue:
[newRuns nextPut: lastLength.
newValues nextPut: lastValue].
self setRuns: newRuns contents setValues: newValues contents
]
{ #category : #enumerating }
RunArray >> findFirst: aBlock [
| index |
index := 1.
self runsAndValuesDo: [ :run :value |
(aBlock value: value) ifTrue: [^index].
index := index + run].
^0
]
{ #category : #enumerating }
RunArray >> findLast: aBlock [
| index |
index := values size + 1.
[(index := index - 1) >= 1] whileTrue:
[(aBlock value: (values at: index)) ifTrue: [^(1 to: index) detectSum: [:i | runs at: i]]].
^0
]
{ #category : #accessing }
RunArray >> first [
^values at: 1
]
{ #category : #testing }
RunArray >> includes: anObject [
"Answer whether anObject is one of the receiver's elements."
^values includes: anObject
]
{ #category : #'self evaluating' }
RunArray >> isSelfEvaluating [
^ self class == RunArray and: [values isSelfEvaluating]
]
{ #category : #testing }
RunArray >> isSorted [
^values isSorted
]
{ #category : #testing }
RunArray >> isSortedBy: aBlock [
^values isSortedBy: aBlock
]
{ #category : #accessing }
RunArray >> last [
^values at: values size
]
{ #category : #private }
RunArray >> mapValues: mapBlock [
"NOTE: only meaningful to an entire set of runs"
values := values collect: mapBlock
]
{ #category : #enumerating }
RunArray >> noneSatisfy: aBlock [
"Only evaluate once per run"
^values noneSatisfy: aBlock
]
{ #category : #copying }
RunArray >> postCopy [
super postCopy.
runs := runs copy.
values := values copy
]
{ #category : #printing }
RunArray >> printOn: aStream [
self printNameOn: aStream.
aStream
nextPutAll: ' runs: ';
print: runs;
nextPutAll: ' values: ';
print: values
]
{ #category : #adding }
RunArray >> rangeOf: attr startingAt: startPos [
"Answer an interval that gives the range of attr at index position startPos. An empty interval with start value startPos is returned when the attribute attr is not present at position startPos. self size > 0 is assumed, it is the responsibility of the caller to test for emptiness of self.
Note that an attribute may span several adjancent runs. "
self at: startPos
setRunOffsetAndValue:
[:run :offset :value |
^(value includes: attr)
ifFalse: [startPos to: startPos - 1]
ifTrue:
[ | firstRelevantPosition lastRelevantPosition idxOfCandidateRun |
lastRelevantPosition := startPos - offset + (runs at: run) - 1.
firstRelevantPosition := startPos - offset.
idxOfCandidateRun := run + 1.
[idxOfCandidateRun <= runs size
and: [(values at: idxOfCandidateRun) includes: attr]]
whileTrue:
[lastRelevantPosition := lastRelevantPosition + (runs at: idxOfCandidateRun).
idxOfCandidateRun := idxOfCandidateRun + 1].
idxOfCandidateRun := run - 1.
[idxOfCandidateRun >= 1
and: [(values at: idxOfCandidateRun) includes: attr]]
whileTrue:
[firstRelevantPosition := firstRelevantPosition - (runs at: idxOfCandidateRun).
idxOfCandidateRun := idxOfCandidateRun - 1].
firstRelevantPosition to: lastRelevantPosition]]
]
{ #category : #removing }
RunArray >> remove: anObject ifAbsent: exceptionBlock [
| index mustCoalesce run |
index := values indexOf: anObject ifAbsent: [^exceptionBlock value].
(run := runs at: index) > 1
ifTrue: [runs at: index put: run - 1]
ifFalse:
[mustCoalesce := index > 1 and: [index < values size and: [(values at: index - 1) = (values at: index + 1)]].
runs := runs copyWithoutIndex: index.
values := values copyWithoutIndex: index.
mustCoalesce
ifTrue:
[runs at: index - 1 put: (runs at: index - 1) + (runs at: index).
runs := runs copyWithoutIndex: index.
values := values copyWithoutIndex: index]].
^anObject
]
{ #category : #removing }
RunArray >> removeAll [
runs := Array new.
values := Array new
]
{ #category : #adding }
RunArray >> repeatLast: times ifEmpty: defaultBlock [
"add the last value back again, the given number of times. If we are empty, add (defaultBlock value)"
times = 0 ifTrue: [^self ].
lastIndex := nil. "flush access cache"
(runs size=0)
ifTrue:
[runs := runs copyWith: times.
values := values copyWith: defaultBlock value]
ifFalse:
[runs at: runs size put: runs last+times]
]
{ #category : #adding }
RunArray >> repeatLastIfEmpty: defaultBlock [
"add the last value back again. If we are empty, add (defaultBlock value)"
lastIndex := nil. "flush access cache"
(runs size=0)
ifTrue:[
runs := runs copyWith: 1.
values := values copyWith: defaultBlock value]
ifFalse:
[runs at: runs size put: runs last+1]
]
{ #category : #enumerating }
RunArray >> replace: aBlock [
"Beware, the block will be evaluated only once per group of values."
values := values replace: aBlock.
self coalesce
]
{ #category : #enumerating }
RunArray >> reverseDo: aBlock [
"This is refined for speed"
| i |
i := runs size.
[i > 0]
whileTrue:
[ | r v |
v := values at: i.
r := runs at: i.
i := i - 1.
[( r := r - 1) >= 0]
whileTrue: [aBlock value: v]].
]
{ #category : #converting }
RunArray >> reversed [
^self class runs: runs reversed values: values reversed
]
{ #category : #accessing }
RunArray >> runLengthAt: index [
"Answer the length remaining in run beginning at index."
self at: index
setRunOffsetAndValue: [:run :offset :value | ^(runs at: run) - offset]
]
{ #category : #private }
RunArray >> runs [
^runs
]
{ #category : #enumerating }
RunArray >> runsAndValuesDo: aBlock [
"Evaluate aBlock with run lengths and values from the receiver"
^runs with: values do: aBlock.
]
{ #category : #enumerating }
RunArray >> runsFrom: start to: stop do: aBlock [
"Evaluate aBlock with all existing runs in the range from start to stop"
start > stop ifTrue:[^self].
self at: start setRunOffsetAndValue:[:firstRun :offset :firstValue|
| run value index |
run := firstRun.
value := firstValue.
index := start + (runs at: run) - offset.
[aBlock value: value.
index <= stop] whileTrue:[
run := run + 1.
value := values at: run.
index := index + (runs at: run)]].
]
{ #category : #enumerating }
RunArray >> select: aBlock [
"Beware, the block will be evaluated only once per group of values."
| newRuns newValues |
newRuns := (Array new: runs size) writeStream.
newValues := (Array new: values size) writeStream.
self runsAndValuesDo: [:run :value |
(aBlock value: value)
ifTrue:
[newRuns add: run.
newValues add: value]].
^(self class runs: newRuns contents values: newValues contents) coalesce
]
{ #category : #private }
RunArray >> setRuns: newRuns setValues: newValues [
lastIndex := nil. "flush access cache"
runs := newRuns asArray.
values := newValues asArray.
]
{ #category : #accessing }
RunArray >> size [
| size |
size := 0.
1 to: runs size do: [:i | size := size + (runs at: i)].
^size
]
{ #category : #printing }
RunArray >> storeOn: aStream [
aStream nextPut: $(.
aStream nextPutAll: self class name.
aStream nextPutAll: ' runs: '.
runs storeOn: aStream.
aStream nextPutAll: ' values: '.
values storeOn: aStream.
aStream nextPut: $)
]
{ #category : #private }
RunArray >> values [
"Answer the values in the receiver."
^values
]
{ #category : #accessing }
RunArray >> withStartStopAndValueDo: aBlock [
| start |
start := 1.
runs with: values do:
[:len : val | | stop |
stop := start + len - 1.
aBlock value: start value: stop value: val.
start := stop + 1]
]
{ #category : #printing }
RunArray >> writeOn: aStream [
aStream nextWordPut: runs size.
1 to: runs size do:
[:x |
aStream nextWordPut: (runs at: x).
aStream nextWordPut: (values at: x)]
]