-
Notifications
You must be signed in to change notification settings - Fork 4.6k
/
StringTests.cs
1626 lines (1400 loc) · 78.4 KB
/
StringTests.cs
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
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Buffers;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Reflection.Emit;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
using Microsoft.DotNet.RemoteExecutor;
using Xunit;
namespace System.Tests
{
public partial class StringTests
{
[Theory]
[InlineData(0, 0)]
[InlineData(3, 1)]
public static void Ctor_CharSpan_EmptyString(int length, int offset)
{
Assert.Same(string.Empty, new string(new ReadOnlySpan<char>(new char[length], offset, 0)));
}
[Fact]
public static unsafe void Ctor_CharSpan_Empty()
{
Assert.Same(string.Empty, new string((ReadOnlySpan<char>)null));
Assert.Same(string.Empty, new string(ReadOnlySpan<char>.Empty));
}
[Theory]
[InlineData(new char[] { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', '\0' }, 0, 8, "abcdefgh")]
[InlineData(new char[] { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', '\0', 'i', 'j', 'k' }, 0, 12, "abcdefgh\0ijk")]
[InlineData(new char[] { 'a', 'b', 'c' }, 0, 0, "")]
[InlineData(new char[] { 'a', 'b', 'c' }, 0, 1, "a")]
[InlineData(new char[] { 'a', 'b', 'c' }, 2, 1, "c")]
[InlineData(new char[] { '\u8001', '\u8002', '\ufffd', '\u1234', '\ud800', '\udfff' }, 0, 6, "\u8001\u8002\ufffd\u1234\ud800\udfff")]
public static void Ctor_CharSpan(char[] valueArray, int startIndex, int length, string expected)
{
var span = new ReadOnlySpan<char>(valueArray, startIndex, length);
Assert.Equal(expected, new string(span));
}
[Fact]
public static unsafe void Ctor_CharPtr_DoesNotAccessInvalidPage()
{
// Allocates a buffer of all 'x' followed by a null terminator,
// then attempts to create a string instance from this at various offsets.
const int MaxCharCount = 128;
using BoundedMemory<char> boundedMemory = BoundedMemory.Allocate<char>(MaxCharCount);
boundedMemory.Span.Fill('x');
boundedMemory.Span[MaxCharCount - 1] = '\0';
boundedMemory.MakeReadonly();
using MemoryHandle memoryHandle = boundedMemory.Memory.Pin();
for (int i = 0; i < MaxCharCount; i++)
{
string expectedString = new string('x', MaxCharCount - i - 1);
string actualString = new string((char*)memoryHandle.Pointer + i);
Assert.Equal(expectedString, actualString);
}
}
[ConditionalFact(nameof(IsSimpleActiveCodePage))]
public static unsafe void Ctor_SBytePtr_DoesNotAccessInvalidPage()
{
// Allocates a buffer of all ' ' followed by a null terminator,
// then attempts to create a string instance from this at various offsets.
// We use U+0020 SPACE instead of any other character because it lives
// at offset 0x20 across every supported code page.
const int MaxByteCount = 128;
using BoundedMemory<sbyte> boundedMemory = BoundedMemory.Allocate<sbyte>(MaxByteCount);
boundedMemory.Span.Fill((sbyte)' ');
boundedMemory.Span[MaxByteCount - 1] = (sbyte)'\0';
boundedMemory.MakeReadonly();
using MemoryHandle memoryHandle = boundedMemory.Memory.Pin();
for (int i = 0; i < MaxByteCount; i++)
{
string expectedString = new string(' ', MaxByteCount - i - 1);
string actualString = new string((sbyte*)memoryHandle.Pointer + i);
Assert.Equal(expectedString, actualString);
}
}
[Fact]
public static void Create_InvalidArguments_Throw()
{
AssertExtensions.Throws<ArgumentNullException>("action", () => string.Create(-1, 0, null));
AssertExtensions.Throws<ArgumentOutOfRangeException>("length", () => string.Create(-1, 0, (span, state) => { }));
}
[Fact]
public static void Create_Length0_ReturnsEmptyString()
{
bool actionInvoked = false;
Assert.Same(string.Empty, string.Create(0, 0, (span, state) => actionInvoked = true));
Assert.False(actionInvoked);
}
[Fact]
public static void Create_NullState_Allowed()
{
string result = string.Create(1, (object)null, (span, state) =>
{
span[0] = 'a';
Assert.Null(state);
});
Assert.Equal("a", result);
}
[Fact]
public static void Create_ClearsMemory()
{
const int Length = 10;
string result = string.Create(Length, (object)null, (span, state) =>
{
for (int i = 0; i < span.Length; i++)
{
Assert.Equal('\0', span[i]);
}
});
Assert.Equal(new string('\0', Length), result);
}
[Theory]
[InlineData("a")]
[InlineData("this is a test")]
[InlineData("\0\u8001\u8002\ufffd\u1234\ud800\udfff")]
public static void Create_ReturnsExpectedString(string expected)
{
char[] input = expected.ToCharArray();
string result = string.Create(input.Length, input, (span, state) =>
{
Assert.Same(input, state);
for (int i = 0; i < state.Length; i++)
{
span[i] = state[i];
}
});
Assert.Equal(expected, result);
}
[Theory]
[InlineData("Hello", 'H', true)]
[InlineData("Hello", 'Z', false)]
[InlineData("Hello", 'e', true)]
[InlineData("Hello", 'E', false)]
[InlineData("", 'H', false)]
public static void Contains(string s, char value, bool expected)
{
Assert.Equal(expected, s.Contains(value));
ReadOnlySpan<char> span = s.AsSpan();
Assert.Equal(expected, span.Contains(value));
}
[Theory]
// CurrentCulture
[InlineData("Hello", 'H', StringComparison.CurrentCulture, true)]
[InlineData("Hello", 'Z', StringComparison.CurrentCulture, false)]
[InlineData("Hello", 'e', StringComparison.CurrentCulture, true)]
[InlineData("Hello", 'E', StringComparison.CurrentCulture, false)]
[InlineData("", 'H', StringComparison.CurrentCulture, false)]
// CurrentCultureIgnoreCase
[InlineData("Hello", 'H', StringComparison.CurrentCultureIgnoreCase, true)]
[InlineData("Hello", 'Z', StringComparison.CurrentCultureIgnoreCase, false)]
[InlineData("Hello", 'e', StringComparison.CurrentCultureIgnoreCase, true)]
[InlineData("Hello", 'E', StringComparison.CurrentCultureIgnoreCase, true)]
[InlineData("", 'H', StringComparison.CurrentCultureIgnoreCase, false)]
// InvariantCulture
[InlineData("Hello", 'H', StringComparison.InvariantCulture, true)]
[InlineData("Hello", 'Z', StringComparison.InvariantCulture, false)]
[InlineData("Hello", 'e', StringComparison.InvariantCulture, true)]
[InlineData("Hello", 'E', StringComparison.InvariantCulture, false)]
[InlineData("", 'H', StringComparison.InvariantCulture, false)]
// InvariantCultureIgnoreCase
[InlineData("Hello", 'H', StringComparison.InvariantCultureIgnoreCase, true)]
[InlineData("Hello", 'Z', StringComparison.InvariantCultureIgnoreCase, false)]
[InlineData("Hello", 'e', StringComparison.InvariantCultureIgnoreCase, true)]
[InlineData("Hello", 'E', StringComparison.InvariantCultureIgnoreCase, true)]
[InlineData("", 'H', StringComparison.InvariantCultureIgnoreCase, false)]
// Ordinal
[InlineData("Hello", 'H', StringComparison.Ordinal, true)]
[InlineData("Hello", 'Z', StringComparison.Ordinal, false)]
[InlineData("Hello", 'e', StringComparison.Ordinal, true)]
[InlineData("Hello", 'E', StringComparison.Ordinal, false)]
[InlineData("", 'H', StringComparison.Ordinal, false)]
// OrdinalIgnoreCase
[InlineData("Hello", 'H', StringComparison.OrdinalIgnoreCase, true)]
[InlineData("Hello", 'Z', StringComparison.OrdinalIgnoreCase, false)]
[InlineData("Hello", 'e', StringComparison.OrdinalIgnoreCase, true)]
[InlineData("Hello", 'E', StringComparison.OrdinalIgnoreCase, true)]
[InlineData("", 'H', StringComparison.OrdinalIgnoreCase, false)]
public static void Contains(string s, char value, StringComparison comparisionType, bool expected)
{
Assert.Equal(expected, s.Contains(value, comparisionType));
}
[Theory]
// CurrentCulture
[InlineData("Hello", "ello", StringComparison.CurrentCulture, true)]
[InlineData("Hello", "ELL", StringComparison.CurrentCulture, false)]
[InlineData("Hello", "ElLo", StringComparison.CurrentCulture, false)]
[InlineData("Hello", "Larger Hello", StringComparison.CurrentCulture, false)]
[InlineData("Hello", "Goodbye", StringComparison.CurrentCulture, false)]
[InlineData("", "", StringComparison.CurrentCulture, true)]
[InlineData("", "hello", StringComparison.CurrentCulture, false)]
[InlineData("Hello", "", StringComparison.CurrentCulture, true)]
[InlineData("Hello", "ell" + SoftHyphen, StringComparison.CurrentCulture, true)]
[InlineData("Hello", "Ell" + SoftHyphen, StringComparison.CurrentCulture, false)]
// CurrentCultureIgnoreCase
[InlineData("Hello", "ello", StringComparison.CurrentCultureIgnoreCase, true)]
[InlineData("Hello", "ELL", StringComparison.CurrentCultureIgnoreCase, true)]
[InlineData("Hello", "ElLo", StringComparison.CurrentCultureIgnoreCase, true)]
[InlineData("Hello", "Larger Hello", StringComparison.CurrentCultureIgnoreCase, false)]
[InlineData("Hello", "Goodbye", StringComparison.CurrentCultureIgnoreCase, false)]
[InlineData("", "", StringComparison.CurrentCultureIgnoreCase, true)]
[InlineData("", "hello", StringComparison.CurrentCultureIgnoreCase, false)]
[InlineData("Hello", "", StringComparison.CurrentCultureIgnoreCase, true)]
[InlineData("Hello", "ell" + SoftHyphen, StringComparison.CurrentCultureIgnoreCase, true)]
[InlineData("Hello", "Ell" + SoftHyphen, StringComparison.CurrentCultureIgnoreCase, true)]
// InvariantCulture
[InlineData("Hello", "ello", StringComparison.InvariantCulture, true)]
[InlineData("Hello", "ELL", StringComparison.InvariantCulture, false)]
[InlineData("Hello", "ElLo", StringComparison.InvariantCulture, false)]
[InlineData("Hello", "Larger Hello", StringComparison.InvariantCulture, false)]
[InlineData("Hello", "Goodbye", StringComparison.InvariantCulture, false)]
[InlineData("", "", StringComparison.InvariantCulture, true)]
[InlineData("", "hello", StringComparison.InvariantCulture, false)]
[InlineData("Hello", "", StringComparison.InvariantCulture, true)]
[InlineData("Hello", "ell" + SoftHyphen, StringComparison.InvariantCulture, true)]
[InlineData("Hello", "Ell" + SoftHyphen, StringComparison.InvariantCulture, false)]
// InvariantCultureIgnoreCase
[InlineData("Hello", "ello", StringComparison.InvariantCultureIgnoreCase, true)]
[InlineData("Hello", "ELL", StringComparison.InvariantCultureIgnoreCase, true)]
[InlineData("Hello", "ElLo", StringComparison.InvariantCultureIgnoreCase, true)]
[InlineData("Hello", "Larger Hello", StringComparison.InvariantCultureIgnoreCase, false)]
[InlineData("Hello", "Goodbye", StringComparison.InvariantCultureIgnoreCase, false)]
[InlineData("", "", StringComparison.InvariantCultureIgnoreCase, true)]
[InlineData("", "hello", StringComparison.InvariantCultureIgnoreCase, false)]
[InlineData("Hello", "", StringComparison.InvariantCultureIgnoreCase, true)]
[InlineData("Hello", "ell" + SoftHyphen, StringComparison.InvariantCultureIgnoreCase, true)]
[InlineData("Hello", "Ell" + SoftHyphen, StringComparison.InvariantCultureIgnoreCase, true)]
// Ordinal
[InlineData("Hello", "ello", StringComparison.Ordinal, true)]
[InlineData("Hello", "ELL", StringComparison.Ordinal, false)]
[InlineData("Hello", "ElLo", StringComparison.Ordinal, false)]
[InlineData("Hello", "Larger Hello", StringComparison.Ordinal, false)]
[InlineData("Hello", "Goodbye", StringComparison.Ordinal, false)]
[InlineData("", "", StringComparison.Ordinal, true)]
[InlineData("", "hello", StringComparison.Ordinal, false)]
[InlineData("Hello", "", StringComparison.Ordinal, true)]
[InlineData("Hello", "ell" + SoftHyphen, StringComparison.Ordinal, false)]
[InlineData("Hello", "Ell" + SoftHyphen, StringComparison.Ordinal, false)]
// OrdinalIgnoreCase
[InlineData("Hello", "ello", StringComparison.OrdinalIgnoreCase, true)]
[InlineData("Hello", "ELL", StringComparison.OrdinalIgnoreCase, true)]
[InlineData("Hello", "ElLo", StringComparison.OrdinalIgnoreCase, true)]
[InlineData("Hello", "Larger Hello", StringComparison.OrdinalIgnoreCase, false)]
[InlineData("Hello", "Goodbye", StringComparison.OrdinalIgnoreCase, false)]
[InlineData("", "", StringComparison.OrdinalIgnoreCase, true)]
[InlineData("", "hello", StringComparison.OrdinalIgnoreCase, false)]
[InlineData("Hello", "", StringComparison.OrdinalIgnoreCase, true)]
[InlineData("Hello", "ell" + SoftHyphen, StringComparison.OrdinalIgnoreCase, false)]
[InlineData("Hello", "Ell" + SoftHyphen, StringComparison.OrdinalIgnoreCase, false)]
public static void Contains(string s, string value, StringComparison comparisonType, bool expected)
{
Assert.Equal(expected, s.Contains(value, comparisonType));
Assert.Equal(expected, s.AsSpan().Contains(value, comparisonType));
}
[Fact]
public static void Contains_StringComparison_TurkishI()
{
const string Source = "\u0069\u0130";
using (new ThreadCultureChange("tr-TR"))
{
Assert.True(Source.Contains("\u0069\u0069", StringComparison.CurrentCultureIgnoreCase));
Assert.True(Source.AsSpan().Contains("\u0069\u0069", StringComparison.CurrentCultureIgnoreCase));
}
using (new ThreadCultureChange("en-US"))
{
Assert.False(Source.Contains("\u0069\u0069", StringComparison.CurrentCultureIgnoreCase));
Assert.False(Source.AsSpan().Contains("\u0069\u0069", StringComparison.CurrentCultureIgnoreCase));
}
}
[Fact]
public static void Contains_Match_Char()
{
Assert.False("".Contains('a'));
Assert.False("".AsSpan().Contains('a'));
// Use a long-enough string to incur vectorization code
const int max = 250;
for (var length = 1; length < max; length++)
{
char[] ca = new char[length];
for (int i = 0; i < length; i++)
{
ca[i] = (char)(i + 1);
}
var span = new Span<char>(ca);
var ros = new ReadOnlySpan<char>(ca);
var str = new string(ca);
for (var targetIndex = 0; targetIndex < length; targetIndex++)
{
char target = ca[targetIndex];
// Span
bool found = span.Contains(target);
Assert.True(found);
// ReadOnlySpan
found = ros.Contains(target);
Assert.True(found);
// String
found = str.Contains(target);
Assert.True(found);
}
}
}
[Fact]
public static void Contains_ZeroLength_Char()
{
// Span
var span = new Span<char>(Array.Empty<char>());
bool found = span.Contains((char)0);
Assert.False(found);
span = Span<char>.Empty;
found = span.Contains((char)0);
Assert.False(found);
// ReadOnlySpan
var ros = new ReadOnlySpan<char>(Array.Empty<char>());
found = ros.Contains((char)0);
Assert.False(found);
ros = ReadOnlySpan<char>.Empty;
found = ros.Contains((char)0);
Assert.False(found);
// String
found = string.Empty.Contains((char)0);
Assert.False(found);
}
[Fact]
public static void Contains_MultipleMatches_Char()
{
for (int length = 2; length < 32; length++)
{
var ca = new char[length];
for (int i = 0; i < length; i++)
{
ca[i] = (char)(i + 1);
}
ca[length - 1] = (char)200;
ca[length - 2] = (char)200;
// Span
var span = new Span<char>(ca);
bool found = span.Contains((char)200);
Assert.True(found);
// ReadOnlySpan
var ros = new ReadOnlySpan<char>(ca);
found = ros.Contains((char)200);
Assert.True(found);
// String
var str = new string(ca);
found = str.Contains((char)200);
Assert.True(found);
}
}
[Fact]
public static void Contains_EnsureNoChecksGoOutOfRange_Char()
{
for (int length = 0; length < 100; length++)
{
var ca = new char[length + 2];
ca[0] = '9';
ca[length + 1] = '9';
// Span
var span = new Span<char>(ca, 1, length);
bool found = span.Contains('9');
Assert.False(found);
// ReadOnlySpan
var ros = new ReadOnlySpan<char>(ca, 1, length);
found = ros.Contains('9');
Assert.False(found);
// String
var str = new string(ca, 1, length);
found = str.Contains('9');
Assert.False(found);
}
}
[Theory]
[InlineData(StringComparison.CurrentCulture)]
[InlineData(StringComparison.CurrentCultureIgnoreCase)]
[InlineData(StringComparison.InvariantCulture)]
[InlineData(StringComparison.InvariantCultureIgnoreCase)]
[InlineData(StringComparison.Ordinal)]
[InlineData(StringComparison.OrdinalIgnoreCase)]
public static void Contains_NullValue_ThrowsArgumentNullException(StringComparison comparisonType)
{
AssertExtensions.Throws<ArgumentNullException>("value", () => "foo".Contains(null, comparisonType));
}
[Theory]
[InlineData(StringComparison.CurrentCulture - 1)]
[InlineData(StringComparison.OrdinalIgnoreCase + 1)]
public static void Contains_InvalidComparisonType_ThrowsArgumentOutOfRangeException(StringComparison comparisonType)
{
AssertExtensions.Throws<ArgumentException>("comparisonType", () => "ab".Contains("a", comparisonType));
}
[Theory]
[InlineData("Hello", 'o', true)]
[InlineData("Hello", 'O', false)]
[InlineData("o", 'o', true)]
[InlineData("o", 'O', false)]
[InlineData("Hello", 'e', false)]
[InlineData("Hello", '\0', false)]
[InlineData("", '\0', false)]
[InlineData("\0", '\0', true)]
[InlineData("", 'a', false)]
[InlineData("abcdefghijklmnopqrstuvwxyz", 'z', true)]
public static void EndsWith(string s, char value, bool expected)
{
Assert.Equal(expected, s.EndsWith(value));
}
[Theory]
[InlineData(new char[0], new int[0])] // empty
[InlineData(new char[] { 'x', 'y', 'z' }, new int[] { 'x', 'y', 'z' })]
[InlineData(new char[] { 'x', '\uD86D', '\uDF54', 'y' }, new int[] { 'x', 0x2B754, 'y' })] // valid surrogate pair
[InlineData(new char[] { 'x', '\uD86D', 'y' }, new int[] { 'x', 0xFFFD, 'y' })] // standalone high surrogate
[InlineData(new char[] { 'x', '\uDF54', 'y' }, new int[] { 'x', 0xFFFD, 'y' })] // standalone low surrogate
[InlineData(new char[] { 'x', '\uD86D' }, new int[] { 'x', 0xFFFD })] // standalone high surrogate at end of string
[InlineData(new char[] { 'x', '\uDF54' }, new int[] { 'x', 0xFFFD })] // standalone low surrogate at end of string
[InlineData(new char[] { 'x', '\uD86D', '\uD86D', 'y' }, new int[] { 'x', 0xFFFD, 0xFFFD, 'y' })] // two high surrogates should be two replacement chars
[InlineData(new char[] { 'x', '\uFFFD', 'y' }, new int[] { 'x', 0xFFFD, 'y' })] // literal U+FFFD
public static void EnumerateRunes(char[] chars, int[] expected)
{
// Test data is smuggled as char[] instead of straight-up string since the test framework
// doesn't like invalid UTF-16 literals.
string asString = new string(chars);
// First, use a straight-up foreach keyword to ensure pattern matching works as expected
List<int> enumeratedScalarValues = new List<int>();
foreach (Rune rune in asString.EnumerateRunes())
{
enumeratedScalarValues.Add(rune.Value);
}
Assert.Equal(expected, enumeratedScalarValues.ToArray());
// Then use LINQ to ensure IEnumerator<...> works as expected
int[] enumeratedValues = new string(chars).EnumerateRunes().Select(r => r.Value).ToArray();
Assert.Equal(expected, enumeratedValues);
}
[Theory]
[InlineData("Hello", 'H', true)]
[InlineData("Hello", 'h', false)]
[InlineData("H", 'H', true)]
[InlineData("H", 'h', false)]
[InlineData("Hello", 'e', false)]
[InlineData("Hello", '\0', false)]
[InlineData("", '\0', false)]
[InlineData("\0", '\0', true)]
[InlineData("", 'a', false)]
[InlineData("abcdefghijklmnopqrstuvwxyz", 'a', true)]
public static void StartsWith(string s, char value, bool expected)
{
Assert.Equal(expected, s.StartsWith(value));
}
public static IEnumerable<object[]> Join_Char_StringArray_TestData()
{
yield return new object[] { '|', new string[0], 0, 0, "" };
yield return new object[] { '|', new string[] { "a" }, 0, 1, "a" };
yield return new object[] { '|', new string[] { "a", "b", "c" }, 0, 3, "a|b|c" };
yield return new object[] { '|', new string[] { "a", "b", "c" }, 0, 2, "a|b" };
yield return new object[] { '|', new string[] { "a", "b", "c" }, 1, 1, "b" };
yield return new object[] { '|', new string[] { "a", "b", "c" }, 1, 2, "b|c" };
yield return new object[] { '|', new string[] { "a", "b", "c" }, 3, 0, "" };
yield return new object[] { '|', new string[] { "a", "b", "c" }, 0, 0, "" };
yield return new object[] { '|', new string[] { "", "", "" }, 0, 3, "||" };
yield return new object[] { '|', new string[] { null, null, null }, 0, 3, "||" };
}
[Theory]
[MemberData(nameof(Join_Char_StringArray_TestData))]
public static void Join_Char_StringArray(char separator, string[] values, int startIndex, int count, string expected)
{
if (startIndex == 0 && count == values.Length)
{
Assert.Equal(expected, string.Join(separator, values));
Assert.Equal(expected, string.Join(separator, (IEnumerable<string>)values));
Assert.Equal(expected, string.Join(separator, (object[])values));
Assert.Equal(expected, string.Join(separator, (IEnumerable<object>)values));
}
Assert.Equal(expected, string.Join(separator, values, startIndex, count));
Assert.Equal(expected, string.Join(separator.ToString(), values, startIndex, count));
}
public static IEnumerable<object[]> Join_Char_ObjectArray_TestData()
{
yield return new object[] { '|', new object[0], "" };
yield return new object[] { '|', new object[] { 1 }, "1" };
yield return new object[] { '|', new object[] { 1, 2, 3 }, "1|2|3" };
yield return new object[] { '|', new object[] { new ObjectWithNullToString(), 2, new ObjectWithNullToString() }, "|2|" };
yield return new object[] { '|', new object[] { "1", null, "3" }, "1||3" };
yield return new object[] { '|', new object[] { "", "", "" }, "||" };
yield return new object[] { '|', new object[] { "", null, "" }, "||" };
yield return new object[] { '|', new object[] { null, null, null }, "||" };
}
[Theory]
[MemberData(nameof(Join_Char_ObjectArray_TestData))]
public static void Join_Char_ObjectArray(char separator, object[] values, string expected)
{
Assert.Equal(expected, string.Join(separator, values));
Assert.Equal(expected, string.Join(separator, (IEnumerable<object>)values));
}
[Fact]
public static void Join_Char_NullValues_ThrowsArgumentNullException()
{
AssertExtensions.Throws<ArgumentNullException>("value", () => string.Join('|', (string[])null));
AssertExtensions.Throws<ArgumentNullException>("value", () => string.Join('|', (string[])null, 0, 0));
AssertExtensions.Throws<ArgumentNullException>("values", () => string.Join('|', (object[])null));
AssertExtensions.Throws<ArgumentNullException>("values", () => string.Join('|', (IEnumerable<object>)null));
}
[Fact]
public static void Join_Char_NegativeStartIndex_ThrowsArgumentOutOfRangeException()
{
AssertExtensions.Throws<ArgumentOutOfRangeException>("startIndex", () => string.Join('|', new string[] { "Foo" }, -1, 0));
}
[Fact]
public static void Join_Char_NegativeCount_ThrowsArgumentOutOfRangeException()
{
AssertExtensions.Throws<ArgumentOutOfRangeException>("count", () => string.Join('|', new string[] { "Foo" }, 0, -1));
}
[Theory]
[InlineData(2, 1)]
[InlineData(2, 0)]
[InlineData(1, 2)]
[InlineData(1, 1)]
[InlineData(0, 2)]
[InlineData(-1, 0)]
public static void Join_Char_InvalidStartIndexCount_ThrowsArgumentOutOfRangeException(int startIndex, int count)
{
AssertExtensions.Throws<ArgumentOutOfRangeException>("startIndex", () => string.Join('|', new string[] { "Foo" }, startIndex, count));
}
public static IEnumerable<object[]> Replace_StringComparison_TestData()
{
yield return new object[] { "abc", "abc", "def", StringComparison.CurrentCulture, "def" };
yield return new object[] { "abc", "ABC", "def", StringComparison.CurrentCulture, "abc" };
yield return new object[] { "abc", "abc", "", StringComparison.CurrentCulture, "" };
yield return new object[] { "abc", "b", "LONG", StringComparison.CurrentCulture, "aLONGc" };
yield return new object[] { "abc", "b", "d", StringComparison.CurrentCulture, "adc" };
yield return new object[] { "abc", "b", null, StringComparison.CurrentCulture, "ac" };
yield return new object[] { "abc", "abc" + SoftHyphen, "def", StringComparison.CurrentCulture, "def" };
yield return new object[] { "abc", "abc", "def", StringComparison.CurrentCultureIgnoreCase, "def" };
yield return new object[] { "abc", "ABC", "def", StringComparison.CurrentCultureIgnoreCase, "def" };
yield return new object[] { "abc", "abc", "", StringComparison.CurrentCultureIgnoreCase, "" };
yield return new object[] { "abc", "b", "LONG", StringComparison.CurrentCultureIgnoreCase, "aLONGc" };
yield return new object[] { "abc", "b", "d", StringComparison.CurrentCultureIgnoreCase, "adc" };
yield return new object[] { "abc", "b", null, StringComparison.CurrentCultureIgnoreCase, "ac" };
yield return new object[] { "abc", "abc" + SoftHyphen, "def", StringComparison.CurrentCultureIgnoreCase, "def" };
yield return new object[] { "abc", "abc", "def", StringComparison.Ordinal, "def" };
yield return new object[] { "abc", "ABC", "def", StringComparison.Ordinal, "abc" };
yield return new object[] { "abc", "abc", "", StringComparison.Ordinal, "" };
yield return new object[] { "abc", "b", "LONG", StringComparison.Ordinal, "aLONGc" };
yield return new object[] { "abc", "b", "d", StringComparison.Ordinal, "adc" };
yield return new object[] { "abc", "b", null, StringComparison.Ordinal, "ac" };
yield return new object[] { "abc", "abc" + SoftHyphen, "def", StringComparison.Ordinal, "abc" };
yield return new object[] { "abc", "abc", "def", StringComparison.OrdinalIgnoreCase, "def" };
yield return new object[] { "abc", "ABC", "def", StringComparison.OrdinalIgnoreCase, "def" };
yield return new object[] { "abc", "abc", "", StringComparison.OrdinalIgnoreCase, "" };
yield return new object[] { "abc", "b", "LONG", StringComparison.OrdinalIgnoreCase, "aLONGc" };
yield return new object[] { "abc", "b", "d", StringComparison.OrdinalIgnoreCase, "adc" };
yield return new object[] { "abc", "b", null, StringComparison.OrdinalIgnoreCase, "ac" };
yield return new object[] { "abc", "abc" + SoftHyphen, "def", StringComparison.OrdinalIgnoreCase, "abc" };
yield return new object[] { "abc", "abc", "def", StringComparison.InvariantCulture, "def" };
yield return new object[] { "abc", "ABC", "def", StringComparison.InvariantCulture, "abc" };
yield return new object[] { "abc", "abc", "", StringComparison.InvariantCulture, "" };
yield return new object[] { "abc", "b", "LONG", StringComparison.InvariantCulture, "aLONGc" };
yield return new object[] { "abc", "b", "d", StringComparison.InvariantCulture, "adc" };
yield return new object[] { "abc", "b", null, StringComparison.InvariantCulture, "ac" };
yield return new object[] { "abc", "abc" + SoftHyphen, "def", StringComparison.InvariantCulture, "def" };
yield return new object[] { "abc", "abc", "def", StringComparison.InvariantCultureIgnoreCase, "def" };
yield return new object[] { "abc", "ABC", "def", StringComparison.InvariantCultureIgnoreCase, "def" };
yield return new object[] { "abc", "abc", "", StringComparison.InvariantCultureIgnoreCase, "" };
yield return new object[] { "abc", "b", "LONG", StringComparison.InvariantCultureIgnoreCase, "aLONGc" };
yield return new object[] { "abc", "b", "d", StringComparison.InvariantCultureIgnoreCase, "adc" };
yield return new object[] { "abc", "b", null, StringComparison.InvariantCultureIgnoreCase, "ac" };
yield return new object[] { "abc", "abc" + SoftHyphen, "def", StringComparison.InvariantCultureIgnoreCase, "def" };
string turkishSource = "\u0069\u0130";
yield return new object[] { turkishSource, "\u0069", "a", StringComparison.Ordinal, "a\u0130" };
yield return new object[] { turkishSource, "\u0069", "a", StringComparison.OrdinalIgnoreCase, "a\u0130" };
yield return new object[] { turkishSource, "\u0130", "a", StringComparison.Ordinal, "\u0069a" };
yield return new object[] { turkishSource, "\u0130", "a", StringComparison.OrdinalIgnoreCase, "\u0069a" };
yield return new object[] { turkishSource, "\u0069", "a", StringComparison.InvariantCulture, "a\u0130" };
yield return new object[] { turkishSource, "\u0069", "a", StringComparison.InvariantCultureIgnoreCase, "a\u0130" };
yield return new object[] { turkishSource, "\u0130", "a", StringComparison.InvariantCulture, "\u0069a" };
yield return new object[] { turkishSource, "\u0130", "a", StringComparison.InvariantCultureIgnoreCase, "\u0069a" };
}
[Theory]
[MemberData(nameof(Replace_StringComparison_TestData))]
public void Replace_StringComparison_ReturnsExpected(string original, string oldValue, string newValue, StringComparison comparisonType, string expected)
{
Assert.Equal(expected, original.Replace(oldValue, newValue, comparisonType));
}
[Fact]
public void Replace_StringComparison_TurkishI()
{
const string Source = "\u0069\u0130";
using (new ThreadCultureChange("tr-TR"))
{
Assert.True("\u0069".Equals("\u0130", StringComparison.CurrentCultureIgnoreCase));
Assert.Equal("a\u0130", Source.Replace("\u0069", "a", StringComparison.CurrentCulture));
Assert.Equal("aa", Source.Replace("\u0069", "a", StringComparison.CurrentCultureIgnoreCase));
Assert.Equal("\u0069a", Source.Replace("\u0130", "a", StringComparison.CurrentCulture));
Assert.Equal("aa", Source.Replace("\u0130", "a", StringComparison.CurrentCultureIgnoreCase));
}
using (new ThreadCultureChange("en-US"))
{
Assert.False("\u0069".Equals("\u0130", StringComparison.CurrentCultureIgnoreCase));
Assert.Equal("a\u0130", Source.Replace("\u0069", "a", StringComparison.CurrentCulture));
Assert.Equal("a\u0130", Source.Replace("\u0069", "a", StringComparison.CurrentCultureIgnoreCase));
Assert.Equal("\u0069a", Source.Replace("\u0130", "a", StringComparison.CurrentCulture));
Assert.Equal("\u0069a", Source.Replace("\u0130", "a", StringComparison.CurrentCultureIgnoreCase));
}
}
public static IEnumerable<object[]> Replace_StringComparisonCulture_TestData()
{
yield return new object[] { "abc", "abc", "def", false, null, "def" };
yield return new object[] { "abc", "ABC", "def", false, null, "abc" };
yield return new object[] { "abc", "abc", "def", false, CultureInfo.InvariantCulture, "def" };
yield return new object[] { "abc", "ABC", "def", false, CultureInfo.InvariantCulture, "abc" };
yield return new object[] { "abc", "abc", "def", true, null, "def" };
yield return new object[] { "abc", "ABC", "def", true, null, "def" };
yield return new object[] { "abc", "abc", "def", true, CultureInfo.InvariantCulture, "def" };
yield return new object[] { "abc", "ABC", "def", true, CultureInfo.InvariantCulture, "def" };
yield return new object[] { "abc", "abc" + SoftHyphen, "def", false, null, "def" };
yield return new object[] { "abc", "abc" + SoftHyphen, "def", true, null, "def" };
yield return new object[] { "abc", "abc" + SoftHyphen, "def", false, CultureInfo.InvariantCulture, "def" };
yield return new object[] { "abc", "abc" + SoftHyphen, "def", true, CultureInfo.InvariantCulture, "def" };
yield return new object[] { "\u0069\u0130", "\u0069", "a", false, new CultureInfo("tr-TR"), "a\u0130" };
yield return new object[] { "\u0069\u0130", "\u0069", "a", true, new CultureInfo("tr-TR"), "aa" };
yield return new object[] { "\u0069\u0130", "\u0069", "a", false, CultureInfo.InvariantCulture, "a\u0130" };
yield return new object[] { "\u0069\u0130", "\u0069", "a", true, CultureInfo.InvariantCulture, "a\u0130" };
}
[Theory]
[MemberData(nameof(Replace_StringComparisonCulture_TestData))]
public void Replace_StringComparisonCulture_ReturnsExpected(string original, string oldValue, string newValue, bool ignoreCase, CultureInfo culture, string expected)
{
Assert.Equal(expected, original.Replace(oldValue, newValue, ignoreCase, culture));
if (culture == null)
{
Assert.Equal(expected, original.Replace(oldValue, newValue, ignoreCase, CultureInfo.CurrentCulture));
}
}
[Fact]
public void Replace_StringComparison_NullOldValue_ThrowsArgumentException()
{
AssertExtensions.Throws<ArgumentNullException>("oldValue", () => "abc".Replace(null, "def", StringComparison.CurrentCulture));
AssertExtensions.Throws<ArgumentNullException>("oldValue", () => "abc".Replace(null, "def", true, CultureInfo.CurrentCulture));
}
[Fact]
public void Replace_StringComparison_EmptyOldValue_ThrowsArgumentException()
{
AssertExtensions.Throws<ArgumentException>("oldValue", () => "abc".Replace("", "def", StringComparison.CurrentCulture));
AssertExtensions.Throws<ArgumentException>("oldValue", () => "abc".Replace("", "def", true, CultureInfo.CurrentCulture));
}
[Fact]
public void Replace_StringComparison_WeightlessOldValue_WithOrdinalComparison_Succeeds()
{
Assert.Equal("abcdef", ("abc" + ZeroWidthJoiner).Replace(ZeroWidthJoiner, "def"));
Assert.Equal("abcdef", ("abc" + ZeroWidthJoiner).Replace(ZeroWidthJoiner, "def", StringComparison.Ordinal));
Assert.Equal("abcdef", ("abc" + ZeroWidthJoiner).Replace(ZeroWidthJoiner, "def", StringComparison.OrdinalIgnoreCase));
}
[Fact]
public void Replace_StringComparison_WeightlessOldValue_WithLinguisticComparison_TerminatesReplacement()
{
Assert.Equal("abc" + ZeroWidthJoiner + "def", ("abc" + ZeroWidthJoiner + "def").Replace(ZeroWidthJoiner, "xyz", StringComparison.CurrentCulture));
Assert.Equal("abc" + ZeroWidthJoiner + "def", ("abc" + ZeroWidthJoiner + "def").Replace(ZeroWidthJoiner, "xyz", true, CultureInfo.CurrentCulture));
}
[Theory]
[InlineData(StringComparison.CurrentCulture - 1)]
[InlineData(StringComparison.OrdinalIgnoreCase + 1)]
public void Replace_NoSuchStringComparison_ThrowsArgumentException(StringComparison comparisonType)
{
AssertExtensions.Throws<ArgumentException>("comparisonType", () => "abc".Replace("abc", "def", comparisonType));
}
private static readonly StringComparison[] StringComparisons = (StringComparison[])Enum.GetValues(typeof(StringComparison));
[Fact]
public static void GetHashCode_OfSpan_EmbeddedNull_ReturnsDifferentHashCodes()
{
Assert.NotEqual(string.GetHashCode("\0AAAAAAAAA".AsSpan()), string.GetHashCode("\0BBBBBBBBBBBB".AsSpan()));
}
[Fact]
public static void GetHashCode_OfSpan_MatchesOfString()
{
// parameterless should be ordinal only
Assert.Equal("abc".GetHashCode(), string.GetHashCode("abc".AsSpan()));
Assert.NotEqual("abc".GetHashCode(), string.GetHashCode("ABC".AsSpan())); // case differences
}
[Fact]
public static void GetHashCode_CompareInfo()
{
// ordinal
Assert.Equal("abc".GetHashCode(), CultureInfo.InvariantCulture.CompareInfo.GetHashCode("abc", CompareOptions.Ordinal));
Assert.NotEqual("abc".GetHashCode(), CultureInfo.InvariantCulture.CompareInfo.GetHashCode("ABC", CompareOptions.Ordinal));
// ordinal ignore case
Assert.Equal("abc".GetHashCode(StringComparison.OrdinalIgnoreCase), CultureInfo.InvariantCulture.CompareInfo.GetHashCode("abc", CompareOptions.OrdinalIgnoreCase));
Assert.Equal("abc".GetHashCode(StringComparison.OrdinalIgnoreCase), CultureInfo.InvariantCulture.CompareInfo.GetHashCode("ABC", CompareOptions.OrdinalIgnoreCase));
// culture-aware
Assert.Equal("aeiXXabc".GetHashCode(StringComparison.CurrentCulture), CultureInfo.CurrentCulture.CompareInfo.GetHashCode("aeiXXabc", CompareOptions.None));
Assert.Equal("aeiXXabc".GetHashCode(StringComparison.CurrentCultureIgnoreCase), CultureInfo.CurrentCulture.CompareInfo.GetHashCode("aeiXXabc", CompareOptions.IgnoreCase));
// invariant culture
Assert.Equal("aeiXXabc".GetHashCode(StringComparison.InvariantCulture), CultureInfo.InvariantCulture.CompareInfo.GetHashCode("aeiXXabc", CompareOptions.None));
Assert.Equal("aeiXXabc".GetHashCode(StringComparison.InvariantCultureIgnoreCase), CultureInfo.InvariantCulture.CompareInfo.GetHashCode("aeiXXabc", CompareOptions.IgnoreCase));
}
[Fact]
public static void GetHashCode_CompareInfo_OfSpan()
{
// ordinal
Assert.Equal("abc".GetHashCode(), CultureInfo.InvariantCulture.CompareInfo.GetHashCode("abc".AsSpan(), CompareOptions.Ordinal));
Assert.NotEqual("abc".GetHashCode(), CultureInfo.InvariantCulture.CompareInfo.GetHashCode("ABC".AsSpan(), CompareOptions.Ordinal));
// ordinal ignore case
Assert.Equal("abc".GetHashCode(StringComparison.OrdinalIgnoreCase), CultureInfo.InvariantCulture.CompareInfo.GetHashCode("abc".AsSpan(), CompareOptions.OrdinalIgnoreCase));
Assert.Equal("abc".GetHashCode(StringComparison.OrdinalIgnoreCase), CultureInfo.InvariantCulture.CompareInfo.GetHashCode("ABC".AsSpan(), CompareOptions.OrdinalIgnoreCase));
// culture-aware
Assert.Equal("aeiXXabc".GetHashCode(StringComparison.CurrentCulture), CultureInfo.CurrentCulture.CompareInfo.GetHashCode("aeiXXabc".AsSpan(), CompareOptions.None));
Assert.Equal("aeiXXabc".GetHashCode(StringComparison.CurrentCultureIgnoreCase), CultureInfo.CurrentCulture.CompareInfo.GetHashCode("aeiXXabc".AsSpan(), CompareOptions.IgnoreCase));
// invariant culture
Assert.Equal("aeiXXabc".GetHashCode(StringComparison.InvariantCulture), CultureInfo.InvariantCulture.CompareInfo.GetHashCode("aeiXXabc".AsSpan(), CompareOptions.None));
Assert.Equal("aeiXXabc".GetHashCode(StringComparison.InvariantCultureIgnoreCase), CultureInfo.InvariantCulture.CompareInfo.GetHashCode("aeiXXabc".AsSpan(), CompareOptions.IgnoreCase));
}
public static IEnumerable<object[]> GetHashCode_StringComparison_Data => StringComparisons.Select(value => new object[] { value });
[Theory]
[MemberData(nameof(GetHashCode_StringComparison_Data))]
public static void GetHashCode_StringComparison(StringComparison comparisonType)
{
int hashCodeFromStringComparer = StringComparer.FromComparison(comparisonType).GetHashCode("abc");
int hashCodeFromStringGetHashCode = "abc".GetHashCode(comparisonType);
int hashCodeFromStringGetHashCodeOfSpan = string.GetHashCode("abc".AsSpan(), comparisonType);
Assert.Equal(hashCodeFromStringComparer, hashCodeFromStringGetHashCode);
Assert.Equal(hashCodeFromStringComparer, hashCodeFromStringGetHashCodeOfSpan);
}
public static IEnumerable<object[]> GetHashCode_NoSuchStringComparison_ThrowsArgumentException_Data => new[]
{
new object[] { StringComparisons.Min() - 1 },
new object[] { StringComparisons.Max() + 1 },
};
[Theory]
[MemberData(nameof(GetHashCode_NoSuchStringComparison_ThrowsArgumentException_Data))]
public static void GetHashCode_NoSuchStringComparison_ThrowsArgumentException(StringComparison comparisonType)
{
AssertExtensions.Throws<ArgumentException>("comparisonType", () => "abc".GetHashCode(comparisonType));
AssertExtensions.Throws<ArgumentException>("comparisonType", () => string.GetHashCode("abc".AsSpan(), comparisonType));
}
[Theory]
[InlineData("")] // empty string
[InlineData("hello")] // non-empty string
public static unsafe void GetPinnableReference_ReturnsSameAsGCHandleAndLegacyFixed(string input)
{
Assert.NotNull(input); // test shouldn't have null input
// First, ensure the value pointed to by GetPinnableReference is correct.
// It should point to the first character (or the null terminator for empty inputs).
ref readonly char rChar = ref input.GetPinnableReference();
Assert.Equal((input.Length > 0) ? input[0] : '\0', rChar);
// Next, ensure that GetPinnableReference() and GCHandle.AddrOfPinnedObject agree
// on the address being returned.
GCHandle gcHandle = GCHandle.Alloc(input, GCHandleType.Pinned);
try
{
Assert.Equal((IntPtr)Unsafe.AsPointer(ref Unsafe.AsRef(in rChar)), gcHandle.AddrOfPinnedObject());
}
finally
{
gcHandle.Free();
}
// Next, ensure that GetPinnableReference matches the string projected as a ROS<char>.
Assert.True(Unsafe.AreSame(ref Unsafe.AsRef(in rChar), ref MemoryMarshal.GetReference((ReadOnlySpan<char>)input)));
// Finally, ensure that GetPinnableReference matches the legacy 'fixed' keyword.
DynamicMethod dynamicMethod = new DynamicMethod("tester", typeof(bool), new[] { typeof(string) });
ILGenerator ilGen = dynamicMethod.GetILGenerator();
LocalBuilder pinnedLocal = ilGen.DeclareLocal(typeof(object), pinned: true);
ilGen.Emit(OpCodes.Ldarg_0); // load 'input' and pin it
ilGen.Emit(OpCodes.Stloc, pinnedLocal);
ilGen.Emit(OpCodes.Ldloc, pinnedLocal); // get the address of field 0 from pinned 'input'
ilGen.Emit(OpCodes.Conv_I);
ilGen.Emit(OpCodes.Call, typeof(RuntimeHelpers).GetProperty("OffsetToStringData").GetMethod); // get pointer to start of string data
ilGen.Emit(OpCodes.Add);
ilGen.Emit(OpCodes.Ldarg_0); // get value of input.GetPinnableReference()
ilGen.Emit(OpCodes.Callvirt, typeof(string).GetMethod("GetPinnableReference"));
// At this point, the top of the evaluation stack is traditional (fixed char* = input) and input.GetPinnableReference().
// Compare for equality and return.
ilGen.Emit(OpCodes.Ceq);
ilGen.Emit(OpCodes.Ret);
Assert.True((bool)dynamicMethod.Invoke(null, new[] { input }));
}
[Fact]
public static unsafe void GetPinnableReference_WithNullInput_ThrowsNullRef()
{
// This test uses an explicit call instead of the normal callvirt that C# would emit.
// This allows us to make sure the NullReferenceException is coming from *within*
// the GetPinnableReference method rather than on the call site to that method.
DynamicMethod dynamicMethod = new DynamicMethod("tester", typeof(void), Type.EmptyTypes);
ILGenerator ilGen = dynamicMethod.GetILGenerator();
ilGen.Emit(OpCodes.Ldnull);
ilGen.Emit(OpCodes.Call, typeof(string).GetMethod("GetPinnableReference"));
ilGen.Emit(OpCodes.Pop);
ilGen.Emit(OpCodes.Ret);
Action del = (Action)dynamicMethod.CreateDelegate(typeof(Action));
Assert.NotNull(del);
Assert.Throws<NullReferenceException>(del);
}
[Theory]
[InlineData("")]
[InlineData("a")]
[InlineData("\0")]
[InlineData("abc")]
public static unsafe void ImplicitCast_ResultingSpanMatches(string s)
{
ReadOnlySpan<char> span = s;
Assert.Equal(s.Length, span.Length);
fixed (char* stringPtr = s)
fixed (char* spanPtr = &MemoryMarshal.GetReference(span))
{
Assert.Equal((IntPtr)stringPtr, (IntPtr)spanPtr);
}
}
[Fact]
public static void ImplicitCast_NullString_ReturnsDefaultSpan()
{
ReadOnlySpan<char> span = (string)null;
Assert.True(span == default);
}
[Theory]
[InlineData("Hello", 'l', StringComparison.Ordinal, 2)]
[InlineData("Hello", 'x', StringComparison.Ordinal, -1)]
[InlineData("Hello", 'h', StringComparison.Ordinal, -1)]
[InlineData("Hello", 'o', StringComparison.Ordinal, 4)]
[InlineData("Hello", 'h', StringComparison.OrdinalIgnoreCase, 0)]
[InlineData("HelLo", 'L', StringComparison.OrdinalIgnoreCase, 2)]
[InlineData("HelLo", 'L', StringComparison.Ordinal, 3)]
[InlineData("HelLo", '\0', StringComparison.Ordinal, -1)]
[InlineData("!@#$%", '%', StringComparison.Ordinal, 4)]
[InlineData("!@#$", '!', StringComparison.Ordinal, 0)]
[InlineData("!@#$", '@', StringComparison.Ordinal, 1)]
[InlineData("!@#$%", '%', StringComparison.OrdinalIgnoreCase, 4)]
[InlineData("!@#$", '!', StringComparison.OrdinalIgnoreCase, 0)]
[InlineData("!@#$", '@', StringComparison.OrdinalIgnoreCase, 1)]
[InlineData("_____________\u807f", '\u007f', StringComparison.Ordinal, -1)]
[InlineData("_____________\u807f__", '\u007f', StringComparison.Ordinal, -1)]
[InlineData("_____________\u807f\u007f_", '\u007f', StringComparison.Ordinal, 14)]
[InlineData("__\u807f_______________", '\u007f', StringComparison.Ordinal, -1)]
[InlineData("__\u807f___\u007f___________", '\u007f', StringComparison.Ordinal, 6)]
[InlineData("_____________\u807f", '\u007f', StringComparison.OrdinalIgnoreCase, -1)]
[InlineData("_____________\u807f__", '\u007f', StringComparison.OrdinalIgnoreCase, -1)]
[InlineData("_____________\u807f\u007f_", '\u007f', StringComparison.OrdinalIgnoreCase, 14)]
[InlineData("__\u807f_______________", '\u007f', StringComparison.OrdinalIgnoreCase, -1)]
[InlineData("__\u807f___\u007f___________", '\u007f', StringComparison.OrdinalIgnoreCase, 6)]
public static void IndexOf_SingleLetter(string s, char target, StringComparison stringComparison, int expected)
{
Assert.Equal(expected, s.IndexOf(target, stringComparison));
var charArray = new char[1];
charArray[0] = target;
Assert.Equal(expected, s.AsSpan().IndexOf(charArray, stringComparison));
}
[Fact]
public static void IndexOf_TurkishI_TurkishCulture_Char()
{
using (new ThreadCultureChange("tr-TR"))
{
string s = "Turkish I \u0131s TROUBL\u0130NG!";
char value = '\u0130';
Assert.Equal(19, s.IndexOf(value));
Assert.Equal(19, s.IndexOf(value, StringComparison.CurrentCulture));
Assert.Equal(4, s.IndexOf(value, StringComparison.CurrentCultureIgnoreCase));
Assert.Equal(19, s.IndexOf(value, StringComparison.Ordinal));
Assert.Equal(19, s.IndexOf(value, StringComparison.OrdinalIgnoreCase));
ReadOnlySpan<char> span = s.AsSpan();
Assert.Equal(19, span.IndexOf(new char[] { value }, StringComparison.CurrentCulture));
Assert.Equal(4, span.IndexOf(new char[] { value }, StringComparison.CurrentCultureIgnoreCase));
Assert.Equal(19, span.IndexOf(new char[] { value }, StringComparison.Ordinal));
Assert.Equal(19, span.IndexOf(new char[] { value }, StringComparison.OrdinalIgnoreCase));
value = '\u0131';
Assert.Equal(10, s.IndexOf(value, StringComparison.CurrentCulture));
Assert.Equal(8, s.IndexOf(value, StringComparison.CurrentCultureIgnoreCase));
Assert.Equal(10, s.IndexOf(value, StringComparison.Ordinal));
Assert.Equal(10, s.IndexOf(value, StringComparison.OrdinalIgnoreCase));
Assert.Equal(10, span.IndexOf(new char[] { value }, StringComparison.CurrentCulture));