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 
21 std::ostream &operator<<(std::ostream &OS, const StringRef &S) {
22   OS << S.str();
23   return OS;
24 }
25 
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 {
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 
64 TEST(StringRefTest, EmptyInitializerList) {
65   StringRef S = {};
66   EXPECT_TRUE(S.empty());
67 
68   S = {};
69   EXPECT_TRUE(S.empty());
70 }
71 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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
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