1 //===- llvm/unittest/ADT/StringRefTest.cpp - StringRef unit tests ---------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "llvm/ADT/StringRef.h"
10 #include "llvm/ADT/Hashing.h"
11 #include "llvm/ADT/STLExtras.h"
12 #include "llvm/ADT/SmallVector.h"
13 #include "llvm/ADT/StringExtras.h"
14 #include "llvm/Support/Allocator.h"
15 #include "llvm/Support/raw_ostream.h"
16 #include "gtest/gtest.h"
17 using namespace llvm;
18
19 namespace llvm {
20
operator <<(std::ostream & OS,const StringRef & S)21 std::ostream &operator<<(std::ostream &OS, const StringRef &S) {
22 OS << S.str();
23 return OS;
24 }
25
operator <<(std::ostream & OS,const std::pair<StringRef,StringRef> & P)26 std::ostream &operator<<(std::ostream &OS,
27 const std::pair<StringRef, StringRef> &P) {
28 OS << "(" << P.first << ", " << P.second << ")";
29 return OS;
30 }
31
32 }
33
34 // Check that we can't accidentally assign a temporary std::string to a
35 // StringRef. (Unfortunately we can't make use of the same thing with
36 // constructors.)
37 static_assert(
38 !std::is_assignable<StringRef&, std::string>::value,
39 "Assigning from prvalue std::string");
40 static_assert(
41 !std::is_assignable<StringRef&, std::string &&>::value,
42 "Assigning from xvalue std::string");
43 static_assert(
44 std::is_assignable<StringRef&, std::string &>::value,
45 "Assigning from lvalue std::string");
46 static_assert(
47 std::is_assignable<StringRef&, const char *>::value,
48 "Assigning from prvalue C string");
49 static_assert(
50 std::is_assignable<StringRef&, const char * &&>::value,
51 "Assigning from xvalue C string");
52 static_assert(
53 std::is_assignable<StringRef&, const char * &>::value,
54 "Assigning from lvalue C string");
55
56 namespace {
TEST(StringRefTest,Construction)57 TEST(StringRefTest, Construction) {
58 EXPECT_EQ("", StringRef());
59 EXPECT_EQ("hello", StringRef("hello"));
60 EXPECT_EQ("hello", StringRef("hello world", 5));
61 EXPECT_EQ("hello", StringRef(std::string("hello")));
62 }
63
TEST(StringRefTest,EmptyInitializerList)64 TEST(StringRefTest, EmptyInitializerList) {
65 StringRef S = {};
66 EXPECT_TRUE(S.empty());
67
68 S = {};
69 EXPECT_TRUE(S.empty());
70 }
71
TEST(StringRefTest,Iteration)72 TEST(StringRefTest, Iteration) {
73 StringRef S("hello");
74 const char *p = "hello";
75 for (const char *it = S.begin(), *ie = S.end(); it != ie; ++it, ++p)
76 EXPECT_EQ(*it, *p);
77 }
78
TEST(StringRefTest,StringOps)79 TEST(StringRefTest, StringOps) {
80 const char *p = "hello";
81 EXPECT_EQ(p, StringRef(p, 0).data());
82 EXPECT_TRUE(StringRef().empty());
83 EXPECT_EQ((size_t) 5, StringRef("hello").size());
84 EXPECT_EQ(-1, StringRef("aab").compare("aad"));
85 EXPECT_EQ( 0, StringRef("aab").compare("aab"));
86 EXPECT_EQ( 1, StringRef("aab").compare("aaa"));
87 EXPECT_EQ(-1, StringRef("aab").compare("aabb"));
88 EXPECT_EQ( 1, StringRef("aab").compare("aa"));
89 EXPECT_EQ( 1, StringRef("\xFF").compare("\1"));
90
91 EXPECT_EQ(-1, StringRef("AaB").compare_lower("aAd"));
92 EXPECT_EQ( 0, StringRef("AaB").compare_lower("aab"));
93 EXPECT_EQ( 1, StringRef("AaB").compare_lower("AAA"));
94 EXPECT_EQ(-1, StringRef("AaB").compare_lower("aaBb"));
95 EXPECT_EQ(-1, StringRef("AaB").compare_lower("bb"));
96 EXPECT_EQ( 1, StringRef("aaBb").compare_lower("AaB"));
97 EXPECT_EQ( 1, StringRef("bb").compare_lower("AaB"));
98 EXPECT_EQ( 1, StringRef("AaB").compare_lower("aA"));
99 EXPECT_EQ( 1, StringRef("\xFF").compare_lower("\1"));
100
101 EXPECT_EQ(-1, StringRef("aab").compare_numeric("aad"));
102 EXPECT_EQ( 0, StringRef("aab").compare_numeric("aab"));
103 EXPECT_EQ( 1, StringRef("aab").compare_numeric("aaa"));
104 EXPECT_EQ(-1, StringRef("aab").compare_numeric("aabb"));
105 EXPECT_EQ( 1, StringRef("aab").compare_numeric("aa"));
106 EXPECT_EQ(-1, StringRef("1").compare_numeric("10"));
107 EXPECT_EQ( 0, StringRef("10").compare_numeric("10"));
108 EXPECT_EQ( 0, StringRef("10a").compare_numeric("10a"));
109 EXPECT_EQ( 1, StringRef("2").compare_numeric("1"));
110 EXPECT_EQ( 0, StringRef("llvm_v1i64_ty").compare_numeric("llvm_v1i64_ty"));
111 EXPECT_EQ( 1, StringRef("\xFF").compare_numeric("\1"));
112 EXPECT_EQ( 1, StringRef("V16").compare_numeric("V1_q0"));
113 EXPECT_EQ(-1, StringRef("V1_q0").compare_numeric("V16"));
114 EXPECT_EQ(-1, StringRef("V8_q0").compare_numeric("V16"));
115 EXPECT_EQ( 1, StringRef("V16").compare_numeric("V8_q0"));
116 EXPECT_EQ(-1, StringRef("V1_q0").compare_numeric("V8_q0"));
117 EXPECT_EQ( 1, StringRef("V8_q0").compare_numeric("V1_q0"));
118 }
119
TEST(StringRefTest,Operators)120 TEST(StringRefTest, Operators) {
121 EXPECT_EQ("", StringRef());
122 EXPECT_TRUE(StringRef("aab") < StringRef("aad"));
123 EXPECT_FALSE(StringRef("aab") < StringRef("aab"));
124 EXPECT_TRUE(StringRef("aab") <= StringRef("aab"));
125 EXPECT_FALSE(StringRef("aab") <= StringRef("aaa"));
126 EXPECT_TRUE(StringRef("aad") > StringRef("aab"));
127 EXPECT_FALSE(StringRef("aab") > StringRef("aab"));
128 EXPECT_TRUE(StringRef("aab") >= StringRef("aab"));
129 EXPECT_FALSE(StringRef("aaa") >= StringRef("aab"));
130 EXPECT_EQ(StringRef("aab"), StringRef("aab"));
131 EXPECT_FALSE(StringRef("aab") == StringRef("aac"));
132 EXPECT_FALSE(StringRef("aab") != StringRef("aab"));
133 EXPECT_TRUE(StringRef("aab") != StringRef("aac"));
134 EXPECT_EQ('a', StringRef("aab")[1]);
135 }
136
TEST(StringRefTest,Substr)137 TEST(StringRefTest, Substr) {
138 StringRef Str("hello");
139 EXPECT_EQ("lo", Str.substr(3));
140 EXPECT_EQ("", Str.substr(100));
141 EXPECT_EQ("hello", Str.substr(0, 100));
142 EXPECT_EQ("o", Str.substr(4, 10));
143 }
144
TEST(StringRefTest,Slice)145 TEST(StringRefTest, Slice) {
146 StringRef Str("hello");
147 EXPECT_EQ("l", Str.slice(2, 3));
148 EXPECT_EQ("ell", Str.slice(1, 4));
149 EXPECT_EQ("llo", Str.slice(2, 100));
150 EXPECT_EQ("", Str.slice(2, 1));
151 EXPECT_EQ("", Str.slice(10, 20));
152 }
153
TEST(StringRefTest,Split)154 TEST(StringRefTest, Split) {
155 StringRef Str("hello");
156 EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
157 Str.split('X'));
158 EXPECT_EQ(std::make_pair(StringRef("h"), StringRef("llo")),
159 Str.split('e'));
160 EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
161 Str.split('h'));
162 EXPECT_EQ(std::make_pair(StringRef("he"), StringRef("lo")),
163 Str.split('l'));
164 EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
165 Str.split('o'));
166
167 EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
168 Str.rsplit('X'));
169 EXPECT_EQ(std::make_pair(StringRef("h"), StringRef("llo")),
170 Str.rsplit('e'));
171 EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
172 Str.rsplit('h'));
173 EXPECT_EQ(std::make_pair(StringRef("hel"), StringRef("o")),
174 Str.rsplit('l'));
175 EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
176 Str.rsplit('o'));
177
178 EXPECT_EQ(std::make_pair(StringRef("he"), StringRef("o")),
179 Str.rsplit("ll"));
180 EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
181 Str.rsplit("h"));
182 EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
183 Str.rsplit("o"));
184 EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
185 Str.rsplit("::"));
186 EXPECT_EQ(std::make_pair(StringRef("hel"), StringRef("o")),
187 Str.rsplit("l"));
188 }
189
TEST(StringRefTest,Split2)190 TEST(StringRefTest, Split2) {
191 SmallVector<StringRef, 5> parts;
192 SmallVector<StringRef, 5> expected;
193
194 expected.push_back("ab"); expected.push_back("c");
195 StringRef(",ab,,c,").split(parts, ",", -1, false);
196 EXPECT_TRUE(parts == expected);
197
198 expected.clear(); parts.clear();
199 expected.push_back(""); expected.push_back("ab"); expected.push_back("");
200 expected.push_back("c"); expected.push_back("");
201 StringRef(",ab,,c,").split(parts, ",", -1, true);
202 EXPECT_TRUE(parts == expected);
203
204 expected.clear(); parts.clear();
205 expected.push_back("");
206 StringRef("").split(parts, ",", -1, true);
207 EXPECT_TRUE(parts == expected);
208
209 expected.clear(); parts.clear();
210 StringRef("").split(parts, ",", -1, false);
211 EXPECT_TRUE(parts == expected);
212
213 expected.clear(); parts.clear();
214 StringRef(",").split(parts, ",", -1, false);
215 EXPECT_TRUE(parts == expected);
216
217 expected.clear(); parts.clear();
218 expected.push_back(""); expected.push_back("");
219 StringRef(",").split(parts, ",", -1, true);
220 EXPECT_TRUE(parts == expected);
221
222 expected.clear(); parts.clear();
223 expected.push_back("a"); expected.push_back("b");
224 StringRef("a,b").split(parts, ",", -1, true);
225 EXPECT_TRUE(parts == expected);
226
227 // Test MaxSplit
228 expected.clear(); parts.clear();
229 expected.push_back("a,,b,c");
230 StringRef("a,,b,c").split(parts, ",", 0, true);
231 EXPECT_TRUE(parts == expected);
232
233 expected.clear(); parts.clear();
234 expected.push_back("a,,b,c");
235 StringRef("a,,b,c").split(parts, ",", 0, false);
236 EXPECT_TRUE(parts == expected);
237
238 expected.clear(); parts.clear();
239 expected.push_back("a"); expected.push_back(",b,c");
240 StringRef("a,,b,c").split(parts, ",", 1, true);
241 EXPECT_TRUE(parts == expected);
242
243 expected.clear(); parts.clear();
244 expected.push_back("a"); expected.push_back(",b,c");
245 StringRef("a,,b,c").split(parts, ",", 1, false);
246 EXPECT_TRUE(parts == expected);
247
248 expected.clear(); parts.clear();
249 expected.push_back("a"); expected.push_back(""); expected.push_back("b,c");
250 StringRef("a,,b,c").split(parts, ",", 2, true);
251 EXPECT_TRUE(parts == expected);
252
253 expected.clear(); parts.clear();
254 expected.push_back("a"); expected.push_back("b,c");
255 StringRef("a,,b,c").split(parts, ",", 2, false);
256 EXPECT_TRUE(parts == expected);
257
258 expected.clear(); parts.clear();
259 expected.push_back("a"); expected.push_back(""); expected.push_back("b");
260 expected.push_back("c");
261 StringRef("a,,b,c").split(parts, ",", 3, true);
262 EXPECT_TRUE(parts == expected);
263
264 expected.clear(); parts.clear();
265 expected.push_back("a"); expected.push_back("b"); expected.push_back("c");
266 StringRef("a,,b,c").split(parts, ",", 3, false);
267 EXPECT_TRUE(parts == expected);
268
269 expected.clear(); parts.clear();
270 expected.push_back("a"); expected.push_back("b"); expected.push_back("c");
271 StringRef("a,,b,c").split(parts, ',', 3, false);
272 EXPECT_TRUE(parts == expected);
273
274 expected.clear(); parts.clear();
275 expected.push_back("");
276 StringRef().split(parts, ",", 0, true);
277 EXPECT_TRUE(parts == expected);
278
279 expected.clear(); parts.clear();
280 expected.push_back(StringRef());
281 StringRef("").split(parts, ",", 0, true);
282 EXPECT_TRUE(parts == expected);
283
284 expected.clear(); parts.clear();
285 StringRef("").split(parts, ",", 0, false);
286 EXPECT_TRUE(parts == expected);
287 StringRef().split(parts, ",", 0, false);
288 EXPECT_TRUE(parts == expected);
289
290 expected.clear(); parts.clear();
291 expected.push_back("a");
292 expected.push_back("");
293 expected.push_back("b");
294 expected.push_back("c,d");
295 StringRef("a,,b,c,d").split(parts, ",", 3, true);
296 EXPECT_TRUE(parts == expected);
297
298 expected.clear(); parts.clear();
299 expected.push_back("");
300 StringRef().split(parts, ',', 0, true);
301 EXPECT_TRUE(parts == expected);
302
303 expected.clear(); parts.clear();
304 expected.push_back(StringRef());
305 StringRef("").split(parts, ',', 0, true);
306 EXPECT_TRUE(parts == expected);
307
308 expected.clear(); parts.clear();
309 StringRef("").split(parts, ',', 0, false);
310 EXPECT_TRUE(parts == expected);
311 StringRef().split(parts, ',', 0, false);
312 EXPECT_TRUE(parts == expected);
313
314 expected.clear(); parts.clear();
315 expected.push_back("a");
316 expected.push_back("");
317 expected.push_back("b");
318 expected.push_back("c,d");
319 StringRef("a,,b,c,d").split(parts, ',', 3, true);
320 EXPECT_TRUE(parts == expected);
321 }
322
TEST(StringRefTest,Trim)323 TEST(StringRefTest, Trim) {
324 StringRef Str0("hello");
325 StringRef Str1(" hello ");
326 StringRef Str2(" hello ");
327 StringRef Str3("\t\n\v\f\r hello \t\n\v\f\r");
328
329 EXPECT_EQ(StringRef("hello"), Str0.rtrim());
330 EXPECT_EQ(StringRef(" hello"), Str1.rtrim());
331 EXPECT_EQ(StringRef(" hello"), Str2.rtrim());
332 EXPECT_EQ(StringRef("\t\n\v\f\r hello"), Str3.rtrim());
333 EXPECT_EQ(StringRef("hello"), Str0.ltrim());
334 EXPECT_EQ(StringRef("hello "), Str1.ltrim());
335 EXPECT_EQ(StringRef("hello "), Str2.ltrim());
336 EXPECT_EQ(StringRef("hello \t\n\v\f\r"), Str3.ltrim());
337 EXPECT_EQ(StringRef("hello"), Str0.trim());
338 EXPECT_EQ(StringRef("hello"), Str1.trim());
339 EXPECT_EQ(StringRef("hello"), Str2.trim());
340 EXPECT_EQ(StringRef("hello"), Str3.trim());
341
342 EXPECT_EQ(StringRef("ello"), Str0.trim("hhhhhhhhhhh"));
343
344 EXPECT_EQ(StringRef(""), StringRef("").trim());
345 EXPECT_EQ(StringRef(""), StringRef(" ").trim());
346 EXPECT_EQ(StringRef("\0", 1), StringRef(" \0 ", 3).trim());
347 EXPECT_EQ(StringRef("\0\0", 2), StringRef("\0\0", 2).trim());
348 EXPECT_EQ(StringRef("x"), StringRef("\0\0x\0\0", 5).trim('\0'));
349 }
350
TEST(StringRefTest,StartsWith)351 TEST(StringRefTest, StartsWith) {
352 StringRef Str("hello");
353 EXPECT_TRUE(Str.startswith(""));
354 EXPECT_TRUE(Str.startswith("he"));
355 EXPECT_FALSE(Str.startswith("helloworld"));
356 EXPECT_FALSE(Str.startswith("hi"));
357 }
358
TEST(StringRefTest,StartsWithLower)359 TEST(StringRefTest, StartsWithLower) {
360 StringRef Str("heLLo");
361 EXPECT_TRUE(Str.startswith_lower(""));
362 EXPECT_TRUE(Str.startswith_lower("he"));
363 EXPECT_TRUE(Str.startswith_lower("hell"));
364 EXPECT_TRUE(Str.startswith_lower("HELlo"));
365 EXPECT_FALSE(Str.startswith_lower("helloworld"));
366 EXPECT_FALSE(Str.startswith_lower("hi"));
367 }
368
TEST(StringRefTest,ConsumeFront)369 TEST(StringRefTest, ConsumeFront) {
370 StringRef Str("hello");
371 EXPECT_TRUE(Str.consume_front(""));
372 EXPECT_EQ("hello", Str);
373 EXPECT_TRUE(Str.consume_front("he"));
374 EXPECT_EQ("llo", Str);
375 EXPECT_FALSE(Str.consume_front("lloworld"));
376 EXPECT_EQ("llo", Str);
377 EXPECT_FALSE(Str.consume_front("lol"));
378 EXPECT_EQ("llo", Str);
379 EXPECT_TRUE(Str.consume_front("llo"));
380 EXPECT_EQ("", Str);
381 EXPECT_FALSE(Str.consume_front("o"));
382 EXPECT_TRUE(Str.consume_front(""));
383 }
384
TEST(StringRefTest,EndsWith)385 TEST(StringRefTest, EndsWith) {
386 StringRef Str("hello");
387 EXPECT_TRUE(Str.endswith(""));
388 EXPECT_TRUE(Str.endswith("lo"));
389 EXPECT_FALSE(Str.endswith("helloworld"));
390 EXPECT_FALSE(Str.endswith("worldhello"));
391 EXPECT_FALSE(Str.endswith("so"));
392 }
393
TEST(StringRefTest,EndsWithLower)394 TEST(StringRefTest, EndsWithLower) {
395 StringRef Str("heLLo");
396 EXPECT_TRUE(Str.endswith_lower(""));
397 EXPECT_TRUE(Str.endswith_lower("lo"));
398 EXPECT_TRUE(Str.endswith_lower("LO"));
399 EXPECT_TRUE(Str.endswith_lower("ELlo"));
400 EXPECT_FALSE(Str.endswith_lower("helloworld"));
401 EXPECT_FALSE(Str.endswith_lower("hi"));
402 }
403
TEST(StringRefTest,ConsumeBack)404 TEST(StringRefTest, ConsumeBack) {
405 StringRef Str("hello");
406 EXPECT_TRUE(Str.consume_back(""));
407 EXPECT_EQ("hello", Str);
408 EXPECT_TRUE(Str.consume_back("lo"));
409 EXPECT_EQ("hel", Str);
410 EXPECT_FALSE(Str.consume_back("helhel"));
411 EXPECT_EQ("hel", Str);
412 EXPECT_FALSE(Str.consume_back("hle"));
413 EXPECT_EQ("hel", Str);
414 EXPECT_TRUE(Str.consume_back("hel"));
415 EXPECT_EQ("", Str);
416 EXPECT_FALSE(Str.consume_back("h"));
417 EXPECT_TRUE(Str.consume_back(""));
418 }
419
TEST(StringRefTest,Find)420 TEST(StringRefTest, Find) {
421 StringRef Str("helloHELLO");
422 StringRef LongStr("hellx xello hell ello world foo bar hello HELLO");
423
424 struct {
425 StringRef Str;
426 char C;
427 std::size_t From;
428 std::size_t Pos;
429 std::size_t LowerPos;
430 } CharExpectations[] = {
431 {Str, 'h', 0U, 0U, 0U},
432 {Str, 'e', 0U, 1U, 1U},
433 {Str, 'l', 0U, 2U, 2U},
434 {Str, 'l', 3U, 3U, 3U},
435 {Str, 'o', 0U, 4U, 4U},
436 {Str, 'L', 0U, 7U, 2U},
437 {Str, 'z', 0U, StringRef::npos, StringRef::npos},
438 };
439
440 struct {
441 StringRef Str;
442 llvm::StringRef S;
443 std::size_t From;
444 std::size_t Pos;
445 std::size_t LowerPos;
446 } StrExpectations[] = {
447 {Str, "helloword", 0, StringRef::npos, StringRef::npos},
448 {Str, "hello", 0, 0U, 0U},
449 {Str, "ello", 0, 1U, 1U},
450 {Str, "zz", 0, StringRef::npos, StringRef::npos},
451 {Str, "ll", 2U, 2U, 2U},
452 {Str, "ll", 3U, StringRef::npos, 7U},
453 {Str, "LL", 2U, 7U, 2U},
454 {Str, "LL", 3U, 7U, 7U},
455 {Str, "", 0U, 0U, 0U},
456 {LongStr, "hello", 0U, 36U, 36U},
457 {LongStr, "foo", 0U, 28U, 28U},
458 {LongStr, "hell", 2U, 12U, 12U},
459 {LongStr, "HELL", 2U, 42U, 12U},
460 {LongStr, "", 0U, 0U, 0U}};
461
462 for (auto &E : CharExpectations) {
463 EXPECT_EQ(E.Pos, E.Str.find(E.C, E.From));
464 EXPECT_EQ(E.LowerPos, E.Str.find_lower(E.C, E.From));
465 EXPECT_EQ(E.LowerPos, E.Str.find_lower(toupper(E.C), E.From));
466 }
467
468 for (auto &E : StrExpectations) {
469 EXPECT_EQ(E.Pos, E.Str.find(E.S, E.From));
470 EXPECT_EQ(E.LowerPos, E.Str.find_lower(E.S, E.From));
471 EXPECT_EQ(E.LowerPos, E.Str.find_lower(E.S.upper(), E.From));
472 }
473
474 EXPECT_EQ(3U, Str.rfind('l'));
475 EXPECT_EQ(StringRef::npos, Str.rfind('z'));
476 EXPECT_EQ(StringRef::npos, Str.rfind("helloworld"));
477 EXPECT_EQ(0U, Str.rfind("hello"));
478 EXPECT_EQ(1U, Str.rfind("ello"));
479 EXPECT_EQ(StringRef::npos, Str.rfind("zz"));
480
481 EXPECT_EQ(8U, Str.rfind_lower('l'));
482 EXPECT_EQ(8U, Str.rfind_lower('L'));
483 EXPECT_EQ(StringRef::npos, Str.rfind_lower('z'));
484 EXPECT_EQ(StringRef::npos, Str.rfind_lower("HELLOWORLD"));
485 EXPECT_EQ(5U, Str.rfind("HELLO"));
486 EXPECT_EQ(6U, Str.rfind("ELLO"));
487 EXPECT_EQ(StringRef::npos, Str.rfind("ZZ"));
488
489 EXPECT_EQ(2U, Str.find_first_of('l'));
490 EXPECT_EQ(1U, Str.find_first_of("el"));
491 EXPECT_EQ(StringRef::npos, Str.find_first_of("xyz"));
492
493 Str = "hello";
494 EXPECT_EQ(1U, Str.find_first_not_of('h'));
495 EXPECT_EQ(4U, Str.find_first_not_of("hel"));
496 EXPECT_EQ(StringRef::npos, Str.find_first_not_of("hello"));
497
498 EXPECT_EQ(3U, Str.find_last_not_of('o'));
499 EXPECT_EQ(1U, Str.find_last_not_of("lo"));
500 EXPECT_EQ(StringRef::npos, Str.find_last_not_of("helo"));
501 }
502
TEST(StringRefTest,Count)503 TEST(StringRefTest, Count) {
504 StringRef Str("hello");
505 EXPECT_EQ(2U, Str.count('l'));
506 EXPECT_EQ(1U, Str.count('o'));
507 EXPECT_EQ(0U, Str.count('z'));
508 EXPECT_EQ(0U, Str.count("helloworld"));
509 EXPECT_EQ(1U, Str.count("hello"));
510 EXPECT_EQ(1U, Str.count("ello"));
511 EXPECT_EQ(0U, Str.count("zz"));
512 EXPECT_EQ(0U, Str.count(""));
513
514 StringRef OverlappingAbba("abbabba");
515 EXPECT_EQ(1U, OverlappingAbba.count("abba"));
516 StringRef NonOverlappingAbba("abbaabba");
517 EXPECT_EQ(2U, NonOverlappingAbba.count("abba"));
518 StringRef ComplexAbba("abbabbaxyzabbaxyz");
519 EXPECT_EQ(2U, ComplexAbba.count("abba"));
520 }
521
TEST(StringRefTest,EditDistance)522 TEST(StringRefTest, EditDistance) {
523 StringRef Hello("hello");
524 EXPECT_EQ(2U, Hello.edit_distance("hill"));
525
526 StringRef Industry("industry");
527 EXPECT_EQ(6U, Industry.edit_distance("interest"));
528
529 StringRef Soylent("soylent green is people");
530 EXPECT_EQ(19U, Soylent.edit_distance("people soiled our green"));
531 EXPECT_EQ(26U, Soylent.edit_distance("people soiled our green",
532 /* allow replacements = */ false));
533 EXPECT_EQ(9U, Soylent.edit_distance("people soiled our green",
534 /* allow replacements = */ true,
535 /* max edit distance = */ 8));
536 EXPECT_EQ(53U, Soylent.edit_distance("people soiled our green "
537 "people soiled our green "
538 "people soiled our green "));
539 }
540
TEST(StringRefTest,Misc)541 TEST(StringRefTest, Misc) {
542 std::string Storage;
543 raw_string_ostream OS(Storage);
544 OS << StringRef("hello");
545 EXPECT_EQ("hello", OS.str());
546 }
547
TEST(StringRefTest,Hashing)548 TEST(StringRefTest, Hashing) {
549 EXPECT_EQ(hash_value(std::string()), hash_value(StringRef()));
550 EXPECT_EQ(hash_value(std::string()), hash_value(StringRef("")));
551 std::string S = "hello world";
552 hash_code H = hash_value(S);
553 EXPECT_EQ(H, hash_value(StringRef("hello world")));
554 EXPECT_EQ(H, hash_value(StringRef(S)));
555 EXPECT_NE(H, hash_value(StringRef("hello worl")));
556 EXPECT_EQ(hash_value(std::string("hello worl")),
557 hash_value(StringRef("hello worl")));
558 EXPECT_NE(H, hash_value(StringRef("hello world ")));
559 EXPECT_EQ(hash_value(std::string("hello world ")),
560 hash_value(StringRef("hello world ")));
561 EXPECT_EQ(H, hash_value(StringRef("hello world\0")));
562 EXPECT_NE(hash_value(std::string("ello worl")),
563 hash_value(StringRef("hello world").slice(1, -1)));
564 }
565
566 struct UnsignedPair {
567 const char *Str;
568 uint64_t Expected;
569 } Unsigned[] =
570 { {"0", 0}
571 , {"255", 255}
572 , {"256", 256}
573 , {"65535", 65535}
574 , {"65536", 65536}
575 , {"4294967295", 4294967295ULL}
576 , {"4294967296", 4294967296ULL}
577 , {"18446744073709551615", 18446744073709551615ULL}
578 , {"042", 34}
579 , {"0x42", 66}
580 , {"0b101010", 42}
581 };
582
583 struct SignedPair {
584 const char *Str;
585 int64_t Expected;
586 } Signed[] =
587 { {"0", 0}
588 , {"-0", 0}
589 , {"127", 127}
590 , {"128", 128}
591 , {"-128", -128}
592 , {"-129", -129}
593 , {"32767", 32767}
594 , {"32768", 32768}
595 , {"-32768", -32768}
596 , {"-32769", -32769}
597 , {"2147483647", 2147483647LL}
598 , {"2147483648", 2147483648LL}
599 , {"-2147483648", -2147483648LL}
600 , {"-2147483649", -2147483649LL}
601 , {"-9223372036854775808", -(9223372036854775807LL) - 1}
602 , {"042", 34}
603 , {"0x42", 66}
604 , {"0b101010", 42}
605 , {"-042", -34}
606 , {"-0x42", -66}
607 , {"-0b101010", -42}
608 };
609
TEST(StringRefTest,getAsInteger)610 TEST(StringRefTest, getAsInteger) {
611 uint8_t U8;
612 uint16_t U16;
613 uint32_t U32;
614 uint64_t U64;
615
616 for (size_t i = 0; i < array_lengthof(Unsigned); ++i) {
617 bool U8Success = StringRef(Unsigned[i].Str).getAsInteger(0, U8);
618 if (static_cast<uint8_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
619 ASSERT_FALSE(U8Success);
620 EXPECT_EQ(U8, Unsigned[i].Expected);
621 } else {
622 ASSERT_TRUE(U8Success);
623 }
624 bool U16Success = StringRef(Unsigned[i].Str).getAsInteger(0, U16);
625 if (static_cast<uint16_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
626 ASSERT_FALSE(U16Success);
627 EXPECT_EQ(U16, Unsigned[i].Expected);
628 } else {
629 ASSERT_TRUE(U16Success);
630 }
631 bool U32Success = StringRef(Unsigned[i].Str).getAsInteger(0, U32);
632 if (static_cast<uint32_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
633 ASSERT_FALSE(U32Success);
634 EXPECT_EQ(U32, Unsigned[i].Expected);
635 } else {
636 ASSERT_TRUE(U32Success);
637 }
638 bool U64Success = StringRef(Unsigned[i].Str).getAsInteger(0, U64);
639 if (static_cast<uint64_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
640 ASSERT_FALSE(U64Success);
641 EXPECT_EQ(U64, Unsigned[i].Expected);
642 } else {
643 ASSERT_TRUE(U64Success);
644 }
645 }
646
647 int8_t S8;
648 int16_t S16;
649 int32_t S32;
650 int64_t S64;
651
652 for (size_t i = 0; i < array_lengthof(Signed); ++i) {
653 bool S8Success = StringRef(Signed[i].Str).getAsInteger(0, S8);
654 if (static_cast<int8_t>(Signed[i].Expected) == Signed[i].Expected) {
655 ASSERT_FALSE(S8Success);
656 EXPECT_EQ(S8, Signed[i].Expected);
657 } else {
658 ASSERT_TRUE(S8Success);
659 }
660 bool S16Success = StringRef(Signed[i].Str).getAsInteger(0, S16);
661 if (static_cast<int16_t>(Signed[i].Expected) == Signed[i].Expected) {
662 ASSERT_FALSE(S16Success);
663 EXPECT_EQ(S16, Signed[i].Expected);
664 } else {
665 ASSERT_TRUE(S16Success);
666 }
667 bool S32Success = StringRef(Signed[i].Str).getAsInteger(0, S32);
668 if (static_cast<int32_t>(Signed[i].Expected) == Signed[i].Expected) {
669 ASSERT_FALSE(S32Success);
670 EXPECT_EQ(S32, Signed[i].Expected);
671 } else {
672 ASSERT_TRUE(S32Success);
673 }
674 bool S64Success = StringRef(Signed[i].Str).getAsInteger(0, S64);
675 if (static_cast<int64_t>(Signed[i].Expected) == Signed[i].Expected) {
676 ASSERT_FALSE(S64Success);
677 EXPECT_EQ(S64, Signed[i].Expected);
678 } else {
679 ASSERT_TRUE(S64Success);
680 }
681 }
682 }
683
684
685 static const char* BadStrings[] = {
686 "" // empty string
687 , "18446744073709551617" // value just over max
688 , "123456789012345678901" // value way too large
689 , "4t23v" // illegal decimal characters
690 , "0x123W56" // illegal hex characters
691 , "0b2" // illegal bin characters
692 , "08" // illegal oct characters
693 , "0o8" // illegal oct characters
694 , "-123" // negative unsigned value
695 , "0x"
696 , "0b"
697 };
698
699
TEST(StringRefTest,getAsUnsignedIntegerBadStrings)700 TEST(StringRefTest, getAsUnsignedIntegerBadStrings) {
701 unsigned long long U64;
702 for (size_t i = 0; i < array_lengthof(BadStrings); ++i) {
703 bool IsBadNumber = StringRef(BadStrings[i]).getAsInteger(0, U64);
704 ASSERT_TRUE(IsBadNumber);
705 }
706 }
707
708 struct ConsumeUnsignedPair {
709 const char *Str;
710 uint64_t Expected;
711 const char *Leftover;
712 } ConsumeUnsigned[] = {
713 {"0", 0, ""},
714 {"255", 255, ""},
715 {"256", 256, ""},
716 {"65535", 65535, ""},
717 {"65536", 65536, ""},
718 {"4294967295", 4294967295ULL, ""},
719 {"4294967296", 4294967296ULL, ""},
720 {"255A376", 255, "A376"},
721 {"18446744073709551615", 18446744073709551615ULL, ""},
722 {"18446744073709551615ABC", 18446744073709551615ULL, "ABC"},
723 {"042", 34, ""},
724 {"0x42", 66, ""},
725 {"0x42-0x34", 66, "-0x34"},
726 {"0b101010", 42, ""},
727 {"0429F", 042, "9F"}, // Auto-sensed octal radix, invalid digit
728 {"0x42G12", 0x42, "G12"}, // Auto-sensed hex radix, invalid digit
729 {"0b10101020101", 42, "20101"}}; // Auto-sensed binary radix, invalid digit.
730
731 struct ConsumeSignedPair {
732 const char *Str;
733 int64_t Expected;
734 const char *Leftover;
735 } ConsumeSigned[] = {
736 {"0", 0, ""},
737 {"-0", 0, ""},
738 {"0-1", 0, "-1"},
739 {"-0-1", 0, "-1"},
740 {"127", 127, ""},
741 {"128", 128, ""},
742 {"127-1", 127, "-1"},
743 {"128-1", 128, "-1"},
744 {"-128", -128, ""},
745 {"-129", -129, ""},
746 {"-128-1", -128, "-1"},
747 {"-129-1", -129, "-1"},
748 {"32767", 32767, ""},
749 {"32768", 32768, ""},
750 {"32767-1", 32767, "-1"},
751 {"32768-1", 32768, "-1"},
752 {"-32768", -32768, ""},
753 {"-32769", -32769, ""},
754 {"-32768-1", -32768, "-1"},
755 {"-32769-1", -32769, "-1"},
756 {"2147483647", 2147483647LL, ""},
757 {"2147483648", 2147483648LL, ""},
758 {"2147483647-1", 2147483647LL, "-1"},
759 {"2147483648-1", 2147483648LL, "-1"},
760 {"-2147483648", -2147483648LL, ""},
761 {"-2147483649", -2147483649LL, ""},
762 {"-2147483648-1", -2147483648LL, "-1"},
763 {"-2147483649-1", -2147483649LL, "-1"},
764 {"-9223372036854775808", -(9223372036854775807LL) - 1, ""},
765 {"-9223372036854775808-1", -(9223372036854775807LL) - 1, "-1"},
766 {"042", 34, ""},
767 {"042-1", 34, "-1"},
768 {"0x42", 66, ""},
769 {"0x42-1", 66, "-1"},
770 {"0b101010", 42, ""},
771 {"0b101010-1", 42, "-1"},
772 {"-042", -34, ""},
773 {"-042-1", -34, "-1"},
774 {"-0x42", -66, ""},
775 {"-0x42-1", -66, "-1"},
776 {"-0b101010", -42, ""},
777 {"-0b101010-1", -42, "-1"}};
778
TEST(StringRefTest,consumeIntegerUnsigned)779 TEST(StringRefTest, consumeIntegerUnsigned) {
780 uint8_t U8;
781 uint16_t U16;
782 uint32_t U32;
783 uint64_t U64;
784
785 for (size_t i = 0; i < array_lengthof(ConsumeUnsigned); ++i) {
786 StringRef Str = ConsumeUnsigned[i].Str;
787 bool U8Success = Str.consumeInteger(0, U8);
788 if (static_cast<uint8_t>(ConsumeUnsigned[i].Expected) ==
789 ConsumeUnsigned[i].Expected) {
790 ASSERT_FALSE(U8Success);
791 EXPECT_EQ(U8, ConsumeUnsigned[i].Expected);
792 EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
793 } else {
794 ASSERT_TRUE(U8Success);
795 }
796
797 Str = ConsumeUnsigned[i].Str;
798 bool U16Success = Str.consumeInteger(0, U16);
799 if (static_cast<uint16_t>(ConsumeUnsigned[i].Expected) ==
800 ConsumeUnsigned[i].Expected) {
801 ASSERT_FALSE(U16Success);
802 EXPECT_EQ(U16, ConsumeUnsigned[i].Expected);
803 EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
804 } else {
805 ASSERT_TRUE(U16Success);
806 }
807
808 Str = ConsumeUnsigned[i].Str;
809 bool U32Success = Str.consumeInteger(0, U32);
810 if (static_cast<uint32_t>(ConsumeUnsigned[i].Expected) ==
811 ConsumeUnsigned[i].Expected) {
812 ASSERT_FALSE(U32Success);
813 EXPECT_EQ(U32, ConsumeUnsigned[i].Expected);
814 EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
815 } else {
816 ASSERT_TRUE(U32Success);
817 }
818
819 Str = ConsumeUnsigned[i].Str;
820 bool U64Success = Str.consumeInteger(0, U64);
821 if (static_cast<uint64_t>(ConsumeUnsigned[i].Expected) ==
822 ConsumeUnsigned[i].Expected) {
823 ASSERT_FALSE(U64Success);
824 EXPECT_EQ(U64, ConsumeUnsigned[i].Expected);
825 EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
826 } else {
827 ASSERT_TRUE(U64Success);
828 }
829 }
830 }
831
TEST(StringRefTest,consumeIntegerSigned)832 TEST(StringRefTest, consumeIntegerSigned) {
833 int8_t S8;
834 int16_t S16;
835 int32_t S32;
836 int64_t S64;
837
838 for (size_t i = 0; i < array_lengthof(ConsumeSigned); ++i) {
839 StringRef Str = ConsumeSigned[i].Str;
840 bool S8Success = Str.consumeInteger(0, S8);
841 if (static_cast<int8_t>(ConsumeSigned[i].Expected) ==
842 ConsumeSigned[i].Expected) {
843 ASSERT_FALSE(S8Success);
844 EXPECT_EQ(S8, ConsumeSigned[i].Expected);
845 EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
846 } else {
847 ASSERT_TRUE(S8Success);
848 }
849
850 Str = ConsumeSigned[i].Str;
851 bool S16Success = Str.consumeInteger(0, S16);
852 if (static_cast<int16_t>(ConsumeSigned[i].Expected) ==
853 ConsumeSigned[i].Expected) {
854 ASSERT_FALSE(S16Success);
855 EXPECT_EQ(S16, ConsumeSigned[i].Expected);
856 EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
857 } else {
858 ASSERT_TRUE(S16Success);
859 }
860
861 Str = ConsumeSigned[i].Str;
862 bool S32Success = Str.consumeInteger(0, S32);
863 if (static_cast<int32_t>(ConsumeSigned[i].Expected) ==
864 ConsumeSigned[i].Expected) {
865 ASSERT_FALSE(S32Success);
866 EXPECT_EQ(S32, ConsumeSigned[i].Expected);
867 EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
868 } else {
869 ASSERT_TRUE(S32Success);
870 }
871
872 Str = ConsumeSigned[i].Str;
873 bool S64Success = Str.consumeInteger(0, S64);
874 if (static_cast<int64_t>(ConsumeSigned[i].Expected) ==
875 ConsumeSigned[i].Expected) {
876 ASSERT_FALSE(S64Success);
877 EXPECT_EQ(S64, ConsumeSigned[i].Expected);
878 EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
879 } else {
880 ASSERT_TRUE(S64Success);
881 }
882 }
883 }
884
885 struct GetDoubleStrings {
886 const char *Str;
887 bool AllowInexact;
888 bool ShouldFail;
889 double D;
890 } DoubleStrings[] = {{"0", false, false, 0.0},
891 {"0.0", false, false, 0.0},
892 {"-0.0", false, false, -0.0},
893 {"123.45", false, true, 123.45},
894 {"123.45", true, false, 123.45},
895 {"1.8e308", true, false, std::numeric_limits<double>::infinity()},
896 {"1.8e308", false, true, std::numeric_limits<double>::infinity()},
897 {"0x0.0000000000001P-1023", false, true, 0.0},
898 {"0x0.0000000000001P-1023", true, false, 0.0},
899 };
900
TEST(StringRefTest,getAsDouble)901 TEST(StringRefTest, getAsDouble) {
902 for (const auto &Entry : DoubleStrings) {
903 double Result;
904 StringRef S(Entry.Str);
905 EXPECT_EQ(Entry.ShouldFail, S.getAsDouble(Result, Entry.AllowInexact));
906 if (!Entry.ShouldFail) {
907 EXPECT_EQ(Result, Entry.D);
908 }
909 }
910 }
911
912 static const char *join_input[] = { "a", "b", "c" };
913 static const char join_result1[] = "a";
914 static const char join_result2[] = "a:b:c";
915 static const char join_result3[] = "a::b::c";
916
TEST(StringRefTest,joinStrings)917 TEST(StringRefTest, joinStrings) {
918 std::vector<StringRef> v1;
919 std::vector<std::string> v2;
920 for (size_t i = 0; i < array_lengthof(join_input); ++i) {
921 v1.push_back(join_input[i]);
922 v2.push_back(join_input[i]);
923 }
924
925 bool v1_join1 = join(v1.begin(), v1.begin() + 1, ":") == join_result1;
926 EXPECT_TRUE(v1_join1);
927 bool v1_join2 = join(v1.begin(), v1.end(), ":") == join_result2;
928 EXPECT_TRUE(v1_join2);
929 bool v1_join3 = join(v1.begin(), v1.end(), "::") == join_result3;
930 EXPECT_TRUE(v1_join3);
931
932 bool v2_join1 = join(v2.begin(), v2.begin() + 1, ":") == join_result1;
933 EXPECT_TRUE(v2_join1);
934 bool v2_join2 = join(v2.begin(), v2.end(), ":") == join_result2;
935 EXPECT_TRUE(v2_join2);
936 bool v2_join3 = join(v2.begin(), v2.end(), "::") == join_result3;
937 EXPECT_TRUE(v2_join3);
938 v2_join3 = join(v2, "::") == join_result3;
939 EXPECT_TRUE(v2_join3);
940 }
941
942
TEST(StringRefTest,AllocatorCopy)943 TEST(StringRefTest, AllocatorCopy) {
944 BumpPtrAllocator Alloc;
945 // First test empty strings. We don't want these to allocate anything on the
946 // allocator.
947 StringRef StrEmpty = "";
948 StringRef StrEmptyc = StrEmpty.copy(Alloc);
949 EXPECT_TRUE(StrEmpty.equals(StrEmptyc));
950 EXPECT_EQ(StrEmptyc.data(), nullptr);
951 EXPECT_EQ(StrEmptyc.size(), 0u);
952 EXPECT_EQ(Alloc.getTotalMemory(), 0u);
953
954 StringRef Str1 = "hello";
955 StringRef Str2 = "bye";
956 StringRef Str1c = Str1.copy(Alloc);
957 StringRef Str2c = Str2.copy(Alloc);
958 EXPECT_TRUE(Str1.equals(Str1c));
959 EXPECT_NE(Str1.data(), Str1c.data());
960 EXPECT_TRUE(Str2.equals(Str2c));
961 EXPECT_NE(Str2.data(), Str2c.data());
962 }
963
TEST(StringRefTest,Drop)964 TEST(StringRefTest, Drop) {
965 StringRef Test("StringRefTest::Drop");
966
967 StringRef Dropped = Test.drop_front(5);
968 EXPECT_EQ(Dropped, "gRefTest::Drop");
969
970 Dropped = Test.drop_back(5);
971 EXPECT_EQ(Dropped, "StringRefTest:");
972
973 Dropped = Test.drop_front(0);
974 EXPECT_EQ(Dropped, Test);
975
976 Dropped = Test.drop_back(0);
977 EXPECT_EQ(Dropped, Test);
978
979 Dropped = Test.drop_front(Test.size());
980 EXPECT_TRUE(Dropped.empty());
981
982 Dropped = Test.drop_back(Test.size());
983 EXPECT_TRUE(Dropped.empty());
984 }
985
TEST(StringRefTest,Take)986 TEST(StringRefTest, Take) {
987 StringRef Test("StringRefTest::Take");
988
989 StringRef Taken = Test.take_front(5);
990 EXPECT_EQ(Taken, "Strin");
991
992 Taken = Test.take_back(5);
993 EXPECT_EQ(Taken, ":Take");
994
995 Taken = Test.take_front(Test.size());
996 EXPECT_EQ(Taken, Test);
997
998 Taken = Test.take_back(Test.size());
999 EXPECT_EQ(Taken, Test);
1000
1001 Taken = Test.take_front(0);
1002 EXPECT_TRUE(Taken.empty());
1003
1004 Taken = Test.take_back(0);
1005 EXPECT_TRUE(Taken.empty());
1006 }
1007
TEST(StringRefTest,FindIf)1008 TEST(StringRefTest, FindIf) {
1009 StringRef Punct("Test.String");
1010 StringRef NoPunct("ABCDEFG");
1011 StringRef Empty;
1012
1013 auto IsPunct = [](char c) { return ::ispunct(c); };
1014 auto IsAlpha = [](char c) { return ::isalpha(c); };
1015 EXPECT_EQ(4U, Punct.find_if(IsPunct));
1016 EXPECT_EQ(StringRef::npos, NoPunct.find_if(IsPunct));
1017 EXPECT_EQ(StringRef::npos, Empty.find_if(IsPunct));
1018
1019 EXPECT_EQ(4U, Punct.find_if_not(IsAlpha));
1020 EXPECT_EQ(StringRef::npos, NoPunct.find_if_not(IsAlpha));
1021 EXPECT_EQ(StringRef::npos, Empty.find_if_not(IsAlpha));
1022 }
1023
TEST(StringRefTest,TakeWhileUntil)1024 TEST(StringRefTest, TakeWhileUntil) {
1025 StringRef Test("String With 1 Number");
1026
1027 StringRef Taken = Test.take_while([](char c) { return ::isdigit(c); });
1028 EXPECT_EQ("", Taken);
1029
1030 Taken = Test.take_until([](char c) { return ::isdigit(c); });
1031 EXPECT_EQ("String With ", Taken);
1032
1033 Taken = Test.take_while([](char c) { return true; });
1034 EXPECT_EQ(Test, Taken);
1035
1036 Taken = Test.take_until([](char c) { return true; });
1037 EXPECT_EQ("", Taken);
1038
1039 Test = "";
1040 Taken = Test.take_while([](char c) { return true; });
1041 EXPECT_EQ("", Taken);
1042 }
1043
TEST(StringRefTest,DropWhileUntil)1044 TEST(StringRefTest, DropWhileUntil) {
1045 StringRef Test("String With 1 Number");
1046
1047 StringRef Taken = Test.drop_while([](char c) { return ::isdigit(c); });
1048 EXPECT_EQ(Test, Taken);
1049
1050 Taken = Test.drop_until([](char c) { return ::isdigit(c); });
1051 EXPECT_EQ("1 Number", Taken);
1052
1053 Taken = Test.drop_while([](char c) { return true; });
1054 EXPECT_EQ("", Taken);
1055
1056 Taken = Test.drop_until([](char c) { return true; });
1057 EXPECT_EQ(Test, Taken);
1058
1059 StringRef EmptyString = "";
1060 Taken = EmptyString.drop_while([](char c) { return true; });
1061 EXPECT_EQ("", Taken);
1062 }
1063
TEST(StringRefTest,StringLiteral)1064 TEST(StringRefTest, StringLiteral) {
1065 constexpr StringRef StringRefs[] = {"Foo", "Bar"};
1066 EXPECT_EQ(StringRef("Foo"), StringRefs[0]);
1067 EXPECT_EQ(StringRef("Bar"), StringRefs[1]);
1068
1069 constexpr StringLiteral Strings[] = {"Foo", "Bar"};
1070 EXPECT_EQ(StringRef("Foo"), Strings[0]);
1071 EXPECT_EQ(StringRef("Bar"), Strings[1]);
1072 }
1073
1074 // Check gtest prints StringRef as a string instead of a container of chars.
1075 // The code is in utils/unittest/googletest/internal/custom/gtest-printers.h
TEST(StringRefTest,GTestPrinter)1076 TEST(StringRefTest, GTestPrinter) {
1077 EXPECT_EQ(R"("foo")", ::testing::PrintToString(StringRef("foo")));
1078 }
1079
1080 static_assert(is_trivially_copyable<StringRef>::value, "trivially copyable");
1081
1082 } // end anonymous namespace
1083