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
|
private typealias ASCIIBitset = DSLTree.CustomCharacterClass.AsciiBitset
extension Processor {
internal mutating func runQuantify(_ payload: QuantifyPayload) -> Bool {
assert(payload.quantKind != .reluctant, ".reluctant is not supported by .quantify")
let minMatches = payload.minTrips
let maxMatches = payload.maxTrips
let produceSavePointRange = payload.quantKind == .eager
let isScalarSemantics = payload.isScalarSemantics
let isZeroOrMore = payload.minTrips == 0 && payload.maxExtraTrips == nil
let isOneOrMore = payload.minTrips == 1 && payload.maxExtraTrips == nil
let matchResult: (next: String.Index, savePointRange: Range<Position>?)?
switch payload.type {
case .asciiBitset:
if isZeroOrMore {
matchResult = input.matchZeroOrMoreASCIIBitset(
registers[payload.bitset],
at: currentPosition,
limitedBy: end,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics)
} else if isOneOrMore {
matchResult = input.matchOneOrMoreASCIIBitset(
registers[payload.bitset],
at: currentPosition,
limitedBy: end,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics)
} else {
matchResult = input.matchQuantifiedASCIIBitset(
registers[payload.bitset],
at: currentPosition,
limitedBy: end,
minMatches: minMatches,
maxMatches: maxMatches,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics)
}
case .asciiChar:
if isZeroOrMore {
matchResult = input.matchZeroOrMoreScalar(
Unicode.Scalar(payload.asciiChar),
at: currentPosition,
limitedBy: end,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics)
} else if isOneOrMore {
matchResult = input.matchOneOrMoreScalar(
Unicode.Scalar(payload.asciiChar),
at: currentPosition,
limitedBy: end,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics)
} else {
matchResult = input.matchQuantifiedScalar(
Unicode.Scalar(payload.asciiChar),
at: currentPosition,
limitedBy: end,
minMatches: minMatches,
maxMatches: maxMatches,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics)
}
case .any:
if isZeroOrMore {
matchResult = input.matchZeroOrMoreRegexDot(
at: currentPosition,
limitedBy: end,
produceSavePointRange: produceSavePointRange,
anyMatchesNewline: payload.anyMatchesNewline,
isScalarSemantics: isScalarSemantics)
} else if isOneOrMore {
matchResult = input.matchOneOrMoreRegexDot(
at: currentPosition,
limitedBy: end,
produceSavePointRange: produceSavePointRange,
anyMatchesNewline: payload.anyMatchesNewline,
isScalarSemantics: isScalarSemantics)
} else {
matchResult = input.matchQuantifiedRegexDot(
at: currentPosition,
limitedBy: end,
minMatches: minMatches,
maxMatches: maxMatches,
produceSavePointRange: produceSavePointRange,
anyMatchesNewline: payload.anyMatchesNewline,
isScalarSemantics: isScalarSemantics)
}
case .builtinCC:
if isZeroOrMore {
matchResult = input.matchZeroOrMoreBuiltinCC(
payload.builtinCC,
at: currentPosition,
limitedBy: end,
produceSavePointRange: produceSavePointRange,
isInverted: payload.builtinIsInverted,
isStrictASCII: payload.builtinIsStrict,
isScalarSemantics: isScalarSemantics)
} else if isOneOrMore {
matchResult = input.matchOneOrMoreBuiltinCC(
payload.builtinCC,
at: currentPosition,
limitedBy: end,
produceSavePointRange: produceSavePointRange,
isInverted: payload.builtinIsInverted,
isStrictASCII: payload.builtinIsStrict,
isScalarSemantics: isScalarSemantics)
} else {
matchResult = input.matchQuantifiedBuiltinCC(
payload.builtinCC,
at: currentPosition,
limitedBy: end,
minMatches: minMatches,
maxMatches: maxMatches,
produceSavePointRange: produceSavePointRange,
isInverted: payload.builtinIsInverted,
isStrictASCII: payload.builtinIsStrict,
isScalarSemantics: isScalarSemantics)
}
}
guard let (next, savePointRange) = matchResult else {
signalFailure()
return false
}
if let savePointRange {
assert(produceSavePointRange)
savePoints.append(makeQuantifiedSavePoint(
savePointRange, isScalarSemantics: payload.isScalarSemantics))
}
currentPosition = next
return true
}
}
/// MARK: - Non-reluctant quantification operations on String
extension String {
/// Run the quant loop, using the supplied matching closure
///
/// NOTE: inline-always to help elimiate the closure overhead,
/// simplify some of the looping structure, etc.
@inline(__always)
fileprivate func _runQuantLoop(
at currentPosition: Index,
limitedBy end: Index,
minMatches: UInt64,
maxMatches: UInt64,
produceSavePointRange: Bool,
isScalarSemantics: Bool,
_ doMatch: (
_ currentPosition: Index, _ limitedBy: Index, _ isScalarSemantics: Bool
) -> Index?
) -> (next: Index, savePointRange: Range<Index>?)? {
var currentPosition = currentPosition
// The range of backtracking positions to try. For zero-or-more, starts
// before any match happens. Always ends before the final match, since
// the final match is what is tried without backtracking. An empty range
// is valid and means a single backtracking position at rangeStart.
var rangeStart = currentPosition
var rangeEnd = currentPosition
var numMatches = 0
while numMatches < maxMatches {
guard let next = doMatch(
currentPosition, end, isScalarSemantics
) else {
break
}
numMatches &+= 1
if numMatches == minMatches {
// For this loop iteration, rangeEnd will actually trail rangeStart by
// a single match position. Next iteration, they will be equal
// (empty range denoting a single backtracking point). Note that we
// only ever return a range if we have exceeded `minMatches`; if we
// exactly match `minMatches` there is no backtracking positions to
// remember.
rangeStart = next
}
rangeEnd = currentPosition
currentPosition = next
assert(currentPosition > rangeEnd)
}
guard numMatches >= minMatches else {
return nil
}
guard produceSavePointRange && numMatches > minMatches else {
// No backtracking positions to try
return (currentPosition, nil)
}
assert(rangeStart <= rangeEnd)
// NOTE: We can't assert that rangeEnd trails currentPosition by exactly
// one position, because newline-sequence in scalar semantic mode still
// matches two scalars
return (
currentPosition,
Range(uncheckedBounds: (lower: rangeStart, upper: rangeEnd))
)
}
// NOTE: [Zero|One]OrMore overloads are to specialize the inlined run loop,
// which has a perf impact. At the time of writing this, 10% for
// zero-or-more and 5% for one-or-more improvement, which could very well
// be much higher if/when the inner match functions are made faster.
fileprivate func matchZeroOrMoreASCIIBitset(
_ asciiBitset: ASCIIBitset,
at currentPosition: Index,
limitedBy end: Index,
produceSavePointRange: Bool,
isScalarSemantics: Bool
) -> (next: Index, savePointRange: Range<Index>?)? {
_runQuantLoop(
at: currentPosition,
limitedBy: end,
minMatches: 0,
maxMatches: UInt64.max,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics
) { currentPosition, end, isScalarSemantics in
matchASCIIBitset(
asciiBitset,
at: currentPosition,
limitedBy: end,
isScalarSemantics: isScalarSemantics)
}
}
fileprivate func matchOneOrMoreASCIIBitset(
_ asciiBitset: ASCIIBitset,
at currentPosition: Index,
limitedBy end: Index,
produceSavePointRange: Bool,
isScalarSemantics: Bool
) -> (next: Index, savePointRange: Range<Index>?)? {
_runQuantLoop(
at: currentPosition,
limitedBy: end,
minMatches: 1,
maxMatches: UInt64.max,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics
) { currentPosition, end, isScalarSemantics in
matchASCIIBitset(
asciiBitset,
at: currentPosition,
limitedBy: end,
isScalarSemantics: isScalarSemantics)
}
}
fileprivate func matchQuantifiedASCIIBitset(
_ asciiBitset: ASCIIBitset,
at currentPosition: Index,
limitedBy end: Index,
minMatches: UInt64,
maxMatches: UInt64,
produceSavePointRange: Bool,
isScalarSemantics: Bool
) -> (next: Index, savePointRange: Range<Index>?)? {
_runQuantLoop(
at: currentPosition,
limitedBy: end,
minMatches: minMatches,
maxMatches: maxMatches,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics
) { currentPosition, end, isScalarSemantics in
matchASCIIBitset(
asciiBitset,
at: currentPosition,
limitedBy: end,
isScalarSemantics: isScalarSemantics)
}
}
fileprivate func matchZeroOrMoreScalar(
_ scalar: Unicode.Scalar,
at currentPosition: Index,
limitedBy end: Index,
produceSavePointRange: Bool,
isScalarSemantics: Bool
) -> (next: Index, savePointRange: Range<Index>?)? {
_runQuantLoop(
at: currentPosition,
limitedBy: end,
minMatches: 0,
maxMatches: UInt64.max,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics
) { currentPosition, end, isScalarSemantics in
matchScalar(
scalar,
at: currentPosition,
limitedBy: end,
boundaryCheck: !isScalarSemantics,
isCaseInsensitive: false)
}
}
fileprivate func matchOneOrMoreScalar(
_ scalar: Unicode.Scalar,
at currentPosition: Index,
limitedBy end: Index,
produceSavePointRange: Bool,
isScalarSemantics: Bool
) -> (next: Index, savePointRange: Range<Index>?)? {
_runQuantLoop(
at: currentPosition,
limitedBy: end,
minMatches: 1,
maxMatches: UInt64.max,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics
) { currentPosition, end, isScalarSemantics in
matchScalar(
scalar,
at: currentPosition,
limitedBy: end,
boundaryCheck: !isScalarSemantics,
isCaseInsensitive: false)
}
}
fileprivate func matchQuantifiedScalar(
_ scalar: Unicode.Scalar,
at currentPosition: Index,
limitedBy end: Index,
minMatches: UInt64,
maxMatches: UInt64,
produceSavePointRange: Bool,
isScalarSemantics: Bool
) -> (next: Index, savePointRange: Range<Index>?)? {
_runQuantLoop(
at: currentPosition,
limitedBy: end,
minMatches: minMatches,
maxMatches: maxMatches,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics
) { currentPosition, end, isScalarSemantics in
matchScalar(
scalar,
at: currentPosition,
limitedBy: end,
boundaryCheck: !isScalarSemantics,
isCaseInsensitive: false)
}
}
fileprivate func matchZeroOrMoreBuiltinCC(
_ builtinCC: _CharacterClassModel.Representation,
at currentPosition: Index,
limitedBy end: Index,
produceSavePointRange: Bool,
isInverted: Bool,
isStrictASCII: Bool,
isScalarSemantics: Bool
) -> (next: Index, savePointRange: Range<Index>?)? {
_runQuantLoop(
at: currentPosition,
limitedBy: end,
minMatches: 0,
maxMatches: UInt64.max,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics
) { currentPosition, end, isScalarSemantics in
matchBuiltinCC(
builtinCC,
at: currentPosition,
limitedBy: end,
isInverted: isInverted,
isStrictASCII: isStrictASCII,
isScalarSemantics: isScalarSemantics)
}
}
fileprivate func matchOneOrMoreBuiltinCC(
_ builtinCC: _CharacterClassModel.Representation,
at currentPosition: Index,
limitedBy end: Index,
produceSavePointRange: Bool,
isInverted: Bool,
isStrictASCII: Bool,
isScalarSemantics: Bool
) -> (next: Index, savePointRange: Range<Index>?)? {
_runQuantLoop(
at: currentPosition,
limitedBy: end,
minMatches: 1,
maxMatches: UInt64.max,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics
) { currentPosition, end, isScalarSemantics in
matchBuiltinCC(
builtinCC,
at: currentPosition,
limitedBy: end,
isInverted: isInverted,
isStrictASCII: isStrictASCII,
isScalarSemantics: isScalarSemantics)
}
}
fileprivate func matchQuantifiedBuiltinCC(
_ builtinCC: _CharacterClassModel.Representation,
at currentPosition: Index,
limitedBy end: Index,
minMatches: UInt64,
maxMatches: UInt64,
produceSavePointRange: Bool,
isInverted: Bool,
isStrictASCII: Bool,
isScalarSemantics: Bool
) -> (next: Index, savePointRange: Range<Index>?)? {
_runQuantLoop(
at: currentPosition,
limitedBy: end,
minMatches: minMatches,
maxMatches: maxMatches,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics
) { currentPosition, end, isScalarSemantics in
matchBuiltinCC(
builtinCC,
at: currentPosition,
limitedBy: end,
isInverted: isInverted,
isStrictASCII: isStrictASCII,
isScalarSemantics: isScalarSemantics)
}
}
fileprivate func matchZeroOrMoreRegexDot(
at currentPosition: Index,
limitedBy end: Index,
produceSavePointRange: Bool,
anyMatchesNewline: Bool,
isScalarSemantics: Bool
) -> (next: Index, savePointRange: Range<Index>?)? {
_runQuantLoop(
at: currentPosition,
limitedBy: end,
minMatches: 0,
maxMatches: UInt64.max,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics
) { currentPosition, end, isScalarSemantics in
matchRegexDot(
at: currentPosition,
limitedBy: end,
anyMatchesNewline: anyMatchesNewline,
isScalarSemantics: isScalarSemantics)
}
}
fileprivate func matchOneOrMoreRegexDot(
at currentPosition: Index,
limitedBy end: Index,
produceSavePointRange: Bool,
anyMatchesNewline: Bool,
isScalarSemantics: Bool
) -> (next: Index, savePointRange: Range<Index>?)? {
_runQuantLoop(
at: currentPosition,
limitedBy: end,
minMatches: 1,
maxMatches: UInt64.max,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics
) { currentPosition, end, isScalarSemantics in
matchRegexDot(
at: currentPosition,
limitedBy: end,
anyMatchesNewline: anyMatchesNewline,
isScalarSemantics: isScalarSemantics)
}
}
fileprivate func matchQuantifiedRegexDot(
at currentPosition: Index,
limitedBy end: Index,
minMatches: UInt64,
maxMatches: UInt64,
produceSavePointRange: Bool,
anyMatchesNewline: Bool,
isScalarSemantics: Bool
) -> (next: Index, savePointRange: Range<Index>?)? {
_runQuantLoop(
at: currentPosition,
limitedBy: end,
minMatches: minMatches,
maxMatches: maxMatches,
produceSavePointRange: produceSavePointRange,
isScalarSemantics: isScalarSemantics
) { currentPosition, end, isScalarSemantics in
matchRegexDot(
at: currentPosition,
limitedBy: end,
anyMatchesNewline: anyMatchesNewline,
isScalarSemantics: isScalarSemantics)
}
}
}
|
