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 #if __cplusplus > 201402L
63   EXPECT_EQ("hello", StringRef(std::string_view("hello")));
64 #endif
65 }
66 
67 TEST(StringRefTest, Conversion) {
68   EXPECT_EQ("hello", std::string(StringRef("hello")));
69 #if __cplusplus > 201402L
70   EXPECT_EQ("hello", std::string_view(StringRef("hello")));
71 #endif
72 }
73 
74 TEST(StringRefTest, EmptyInitializerList) {
75   StringRef S = {};
76   EXPECT_TRUE(S.empty());
77 
78   S = {};
79   EXPECT_TRUE(S.empty());
80 }
81 
82 TEST(StringRefTest, Iteration) {
83   StringRef S("hello");
84   const char *p = "hello";
85   for (const char *it = S.begin(), *ie = S.end(); it != ie; ++it, ++p)
86     EXPECT_EQ(*it, *p);
87 }
88 
89 TEST(StringRefTest, StringOps) {
90   const char *p = "hello";
91   EXPECT_EQ(p, StringRef(p, 0).data());
92   EXPECT_TRUE(StringRef().empty());
93   EXPECT_EQ((size_t) 5, StringRef("hello").size());
94   EXPECT_EQ(-1, StringRef("aab").compare("aad"));
95   EXPECT_EQ( 0, StringRef("aab").compare("aab"));
96   EXPECT_EQ( 1, StringRef("aab").compare("aaa"));
97   EXPECT_EQ(-1, StringRef("aab").compare("aabb"));
98   EXPECT_EQ( 1, StringRef("aab").compare("aa"));
99   EXPECT_EQ( 1, StringRef("\xFF").compare("\1"));
100 
101   EXPECT_EQ(-1, StringRef("AaB").compare_insensitive("aAd"));
102   EXPECT_EQ( 0, StringRef("AaB").compare_insensitive("aab"));
103   EXPECT_EQ( 1, StringRef("AaB").compare_insensitive("AAA"));
104   EXPECT_EQ(-1, StringRef("AaB").compare_insensitive("aaBb"));
105   EXPECT_EQ(-1, StringRef("AaB").compare_insensitive("bb"));
106   EXPECT_EQ( 1, StringRef("aaBb").compare_insensitive("AaB"));
107   EXPECT_EQ( 1, StringRef("bb").compare_insensitive("AaB"));
108   EXPECT_EQ( 1, StringRef("AaB").compare_insensitive("aA"));
109   EXPECT_EQ( 1, StringRef("\xFF").compare_insensitive("\1"));
110 
111   EXPECT_EQ(-1, StringRef("aab").compare_numeric("aad"));
112   EXPECT_EQ( 0, StringRef("aab").compare_numeric("aab"));
113   EXPECT_EQ( 1, StringRef("aab").compare_numeric("aaa"));
114   EXPECT_EQ(-1, StringRef("aab").compare_numeric("aabb"));
115   EXPECT_EQ( 1, StringRef("aab").compare_numeric("aa"));
116   EXPECT_EQ(-1, StringRef("1").compare_numeric("10"));
117   EXPECT_EQ( 0, StringRef("10").compare_numeric("10"));
118   EXPECT_EQ( 0, StringRef("10a").compare_numeric("10a"));
119   EXPECT_EQ( 1, StringRef("2").compare_numeric("1"));
120   EXPECT_EQ( 0, StringRef("llvm_v1i64_ty").compare_numeric("llvm_v1i64_ty"));
121   EXPECT_EQ( 1, StringRef("\xFF").compare_numeric("\1"));
122   EXPECT_EQ( 1, StringRef("V16").compare_numeric("V1_q0"));
123   EXPECT_EQ(-1, StringRef("V1_q0").compare_numeric("V16"));
124   EXPECT_EQ(-1, StringRef("V8_q0").compare_numeric("V16"));
125   EXPECT_EQ( 1, StringRef("V16").compare_numeric("V8_q0"));
126   EXPECT_EQ(-1, StringRef("V1_q0").compare_numeric("V8_q0"));
127   EXPECT_EQ( 1, StringRef("V8_q0").compare_numeric("V1_q0"));
128 }
129 
130 TEST(StringRefTest, Operators) {
131   EXPECT_EQ("", StringRef());
132   EXPECT_TRUE(StringRef("aab") < StringRef("aad"));
133   EXPECT_FALSE(StringRef("aab") < StringRef("aab"));
134   EXPECT_TRUE(StringRef("aab") <= StringRef("aab"));
135   EXPECT_FALSE(StringRef("aab") <= StringRef("aaa"));
136   EXPECT_TRUE(StringRef("aad") > StringRef("aab"));
137   EXPECT_FALSE(StringRef("aab") > StringRef("aab"));
138   EXPECT_TRUE(StringRef("aab") >= StringRef("aab"));
139   EXPECT_FALSE(StringRef("aaa") >= StringRef("aab"));
140   EXPECT_EQ(StringRef("aab"), StringRef("aab"));
141   EXPECT_FALSE(StringRef("aab") == StringRef("aac"));
142   EXPECT_FALSE(StringRef("aab") != StringRef("aab"));
143   EXPECT_TRUE(StringRef("aab") != StringRef("aac"));
144   EXPECT_EQ('a', StringRef("aab")[1]);
145 }
146 
147 TEST(StringRefTest, Substr) {
148   StringRef Str("hello");
149   EXPECT_EQ("lo", Str.substr(3));
150   EXPECT_EQ("", Str.substr(100));
151   EXPECT_EQ("hello", Str.substr(0, 100));
152   EXPECT_EQ("o", Str.substr(4, 10));
153 }
154 
155 TEST(StringRefTest, Slice) {
156   StringRef Str("hello");
157   EXPECT_EQ("l", Str.slice(2, 3));
158   EXPECT_EQ("ell", Str.slice(1, 4));
159   EXPECT_EQ("llo", Str.slice(2, 100));
160   EXPECT_EQ("", Str.slice(2, 1));
161   EXPECT_EQ("", Str.slice(10, 20));
162 }
163 
164 TEST(StringRefTest, Split) {
165   StringRef Str("hello");
166   EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
167             Str.split('X'));
168   EXPECT_EQ(std::make_pair(StringRef("h"), StringRef("llo")),
169             Str.split('e'));
170   EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
171             Str.split('h'));
172   EXPECT_EQ(std::make_pair(StringRef("he"), StringRef("lo")),
173             Str.split('l'));
174   EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
175             Str.split('o'));
176 
177   EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
178             Str.rsplit('X'));
179   EXPECT_EQ(std::make_pair(StringRef("h"), StringRef("llo")),
180             Str.rsplit('e'));
181   EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
182             Str.rsplit('h'));
183   EXPECT_EQ(std::make_pair(StringRef("hel"), StringRef("o")),
184             Str.rsplit('l'));
185   EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
186             Str.rsplit('o'));
187 
188   EXPECT_EQ(std::make_pair(StringRef("he"), StringRef("o")),
189 		    Str.rsplit("ll"));
190   EXPECT_EQ(std::make_pair(StringRef(""), StringRef("ello")),
191 		    Str.rsplit("h"));
192   EXPECT_EQ(std::make_pair(StringRef("hell"), StringRef("")),
193 	      Str.rsplit("o"));
194   EXPECT_EQ(std::make_pair(StringRef("hello"), StringRef("")),
195 		    Str.rsplit("::"));
196   EXPECT_EQ(std::make_pair(StringRef("hel"), StringRef("o")),
197 		    Str.rsplit("l"));
198 }
199 
200 TEST(StringRefTest, Split2) {
201   SmallVector<StringRef, 5> parts;
202   SmallVector<StringRef, 5> expected;
203 
204   expected.push_back("ab"); expected.push_back("c");
205   StringRef(",ab,,c,").split(parts, ",", -1, false);
206   EXPECT_TRUE(parts == expected);
207 
208   expected.clear(); parts.clear();
209   expected.push_back(""); expected.push_back("ab"); expected.push_back("");
210   expected.push_back("c"); expected.push_back("");
211   StringRef(",ab,,c,").split(parts, ",", -1, true);
212   EXPECT_TRUE(parts == expected);
213 
214   expected.clear(); parts.clear();
215   expected.push_back("");
216   StringRef("").split(parts, ",", -1, true);
217   EXPECT_TRUE(parts == expected);
218 
219   expected.clear(); parts.clear();
220   StringRef("").split(parts, ",", -1, false);
221   EXPECT_TRUE(parts == expected);
222 
223   expected.clear(); parts.clear();
224   StringRef(",").split(parts, ",", -1, false);
225   EXPECT_TRUE(parts == expected);
226 
227   expected.clear(); parts.clear();
228   expected.push_back(""); expected.push_back("");
229   StringRef(",").split(parts, ",", -1, true);
230   EXPECT_TRUE(parts == expected);
231 
232   expected.clear(); parts.clear();
233   expected.push_back("a"); expected.push_back("b");
234   StringRef("a,b").split(parts, ",", -1, true);
235   EXPECT_TRUE(parts == expected);
236 
237   // Test MaxSplit
238   expected.clear(); parts.clear();
239   expected.push_back("a,,b,c");
240   StringRef("a,,b,c").split(parts, ",", 0, true);
241   EXPECT_TRUE(parts == expected);
242 
243   expected.clear(); parts.clear();
244   expected.push_back("a,,b,c");
245   StringRef("a,,b,c").split(parts, ",", 0, false);
246   EXPECT_TRUE(parts == expected);
247 
248   expected.clear(); parts.clear();
249   expected.push_back("a"); expected.push_back(",b,c");
250   StringRef("a,,b,c").split(parts, ",", 1, 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, ",", 1, false);
256   EXPECT_TRUE(parts == expected);
257 
258   expected.clear(); parts.clear();
259   expected.push_back("a"); expected.push_back(""); expected.push_back("b,c");
260   StringRef("a,,b,c").split(parts, ",", 2, true);
261   EXPECT_TRUE(parts == expected);
262 
263   expected.clear(); parts.clear();
264   expected.push_back("a"); expected.push_back("b,c");
265   StringRef("a,,b,c").split(parts, ",", 2, false);
266   EXPECT_TRUE(parts == expected);
267 
268   expected.clear(); parts.clear();
269   expected.push_back("a"); expected.push_back(""); expected.push_back("b");
270   expected.push_back("c");
271   StringRef("a,,b,c").split(parts, ",", 3, true);
272   EXPECT_TRUE(parts == expected);
273 
274   expected.clear(); parts.clear();
275   expected.push_back("a"); expected.push_back("b"); expected.push_back("c");
276   StringRef("a,,b,c").split(parts, ",", 3, false);
277   EXPECT_TRUE(parts == expected);
278 
279   expected.clear(); parts.clear();
280   expected.push_back("a"); expected.push_back("b"); expected.push_back("c");
281   StringRef("a,,b,c").split(parts, ',', 3, false);
282   EXPECT_TRUE(parts == expected);
283 
284   expected.clear(); parts.clear();
285   expected.push_back("");
286   StringRef().split(parts, ",", 0, true);
287   EXPECT_TRUE(parts == expected);
288 
289   expected.clear(); parts.clear();
290   expected.push_back(StringRef());
291   StringRef("").split(parts, ",", 0, true);
292   EXPECT_TRUE(parts == expected);
293 
294   expected.clear(); parts.clear();
295   StringRef("").split(parts, ",", 0, false);
296   EXPECT_TRUE(parts == expected);
297   StringRef().split(parts, ",", 0, false);
298   EXPECT_TRUE(parts == expected);
299 
300   expected.clear(); parts.clear();
301   expected.push_back("a");
302   expected.push_back("");
303   expected.push_back("b");
304   expected.push_back("c,d");
305   StringRef("a,,b,c,d").split(parts, ",", 3, true);
306   EXPECT_TRUE(parts == expected);
307 
308   expected.clear(); parts.clear();
309   expected.push_back("");
310   StringRef().split(parts, ',', 0, true);
311   EXPECT_TRUE(parts == expected);
312 
313   expected.clear(); parts.clear();
314   expected.push_back(StringRef());
315   StringRef("").split(parts, ',', 0, true);
316   EXPECT_TRUE(parts == expected);
317 
318   expected.clear(); parts.clear();
319   StringRef("").split(parts, ',', 0, false);
320   EXPECT_TRUE(parts == expected);
321   StringRef().split(parts, ',', 0, false);
322   EXPECT_TRUE(parts == expected);
323 
324   expected.clear(); parts.clear();
325   expected.push_back("a");
326   expected.push_back("");
327   expected.push_back("b");
328   expected.push_back("c,d");
329   StringRef("a,,b,c,d").split(parts, ',', 3, true);
330   EXPECT_TRUE(parts == expected);
331 }
332 
333 TEST(StringRefTest, Trim) {
334   StringRef Str0("hello");
335   StringRef Str1(" hello ");
336   StringRef Str2("  hello  ");
337   StringRef Str3("\t\n\v\f\r  hello  \t\n\v\f\r");
338 
339   EXPECT_EQ(StringRef("hello"), Str0.rtrim());
340   EXPECT_EQ(StringRef(" hello"), Str1.rtrim());
341   EXPECT_EQ(StringRef("  hello"), Str2.rtrim());
342   EXPECT_EQ(StringRef("\t\n\v\f\r  hello"), Str3.rtrim());
343   EXPECT_EQ(StringRef("hello"), Str0.ltrim());
344   EXPECT_EQ(StringRef("hello "), Str1.ltrim());
345   EXPECT_EQ(StringRef("hello  "), Str2.ltrim());
346   EXPECT_EQ(StringRef("hello  \t\n\v\f\r"), Str3.ltrim());
347   EXPECT_EQ(StringRef("hello"), Str0.trim());
348   EXPECT_EQ(StringRef("hello"), Str1.trim());
349   EXPECT_EQ(StringRef("hello"), Str2.trim());
350   EXPECT_EQ(StringRef("hello"), Str3.trim());
351 
352   EXPECT_EQ(StringRef("ello"), Str0.trim("hhhhhhhhhhh"));
353 
354   EXPECT_EQ(StringRef(""), StringRef("").trim());
355   EXPECT_EQ(StringRef(""), StringRef(" ").trim());
356   EXPECT_EQ(StringRef("\0", 1), StringRef(" \0 ", 3).trim());
357   EXPECT_EQ(StringRef("\0\0", 2), StringRef("\0\0", 2).trim());
358   EXPECT_EQ(StringRef("x"), StringRef("\0\0x\0\0", 5).trim('\0'));
359 }
360 
361 TEST(StringRefTest, StartsWith) {
362   StringRef Str("hello");
363   EXPECT_TRUE(Str.startswith(""));
364   EXPECT_TRUE(Str.startswith("he"));
365   EXPECT_FALSE(Str.startswith("helloworld"));
366   EXPECT_FALSE(Str.startswith("hi"));
367 }
368 
369 TEST(StringRefTest, StartsWithInsensitive) {
370   StringRef Str("heLLo");
371   EXPECT_TRUE(Str.startswith_insensitive(""));
372   EXPECT_TRUE(Str.startswith_insensitive("he"));
373   EXPECT_TRUE(Str.startswith_insensitive("hell"));
374   EXPECT_TRUE(Str.startswith_insensitive("HELlo"));
375   EXPECT_FALSE(Str.startswith_insensitive("helloworld"));
376   EXPECT_FALSE(Str.startswith_insensitive("hi"));
377 }
378 
379 TEST(StringRefTest, ConsumeFront) {
380   StringRef Str("hello");
381   EXPECT_TRUE(Str.consume_front(""));
382   EXPECT_EQ("hello", Str);
383   EXPECT_TRUE(Str.consume_front("he"));
384   EXPECT_EQ("llo", Str);
385   EXPECT_FALSE(Str.consume_front("lloworld"));
386   EXPECT_EQ("llo", Str);
387   EXPECT_FALSE(Str.consume_front("lol"));
388   EXPECT_EQ("llo", Str);
389   EXPECT_TRUE(Str.consume_front("llo"));
390   EXPECT_EQ("", Str);
391   EXPECT_FALSE(Str.consume_front("o"));
392   EXPECT_TRUE(Str.consume_front(""));
393 }
394 
395 TEST(StringRefTest, ConsumeFrontInsensitive) {
396   StringRef Str("heLLo");
397   EXPECT_TRUE(Str.consume_front_insensitive(""));
398   EXPECT_EQ("heLLo", Str);
399   EXPECT_FALSE(Str.consume_front("HEl"));
400   EXPECT_EQ("heLLo", Str);
401   EXPECT_TRUE(Str.consume_front_insensitive("HEl"));
402   EXPECT_EQ("Lo", Str);
403   EXPECT_FALSE(Str.consume_front_insensitive("loworld"));
404   EXPECT_EQ("Lo", Str);
405   EXPECT_FALSE(Str.consume_front_insensitive("ol"));
406   EXPECT_EQ("Lo", Str);
407   EXPECT_TRUE(Str.consume_front_insensitive("lo"));
408   EXPECT_EQ("", Str);
409   EXPECT_FALSE(Str.consume_front_insensitive("o"));
410   EXPECT_TRUE(Str.consume_front_insensitive(""));
411 }
412 
413 TEST(StringRefTest, EndsWith) {
414   StringRef Str("hello");
415   EXPECT_TRUE(Str.endswith(""));
416   EXPECT_TRUE(Str.endswith("lo"));
417   EXPECT_FALSE(Str.endswith("helloworld"));
418   EXPECT_FALSE(Str.endswith("worldhello"));
419   EXPECT_FALSE(Str.endswith("so"));
420 }
421 
422 TEST(StringRefTest, EndsWithInsensitive) {
423   StringRef Str("heLLo");
424   EXPECT_TRUE(Str.endswith_insensitive(""));
425   EXPECT_TRUE(Str.endswith_insensitive("lo"));
426   EXPECT_TRUE(Str.endswith_insensitive("LO"));
427   EXPECT_TRUE(Str.endswith_insensitive("ELlo"));
428   EXPECT_FALSE(Str.endswith_insensitive("helloworld"));
429   EXPECT_FALSE(Str.endswith_insensitive("hi"));
430 }
431 
432 TEST(StringRefTest, ConsumeBack) {
433   StringRef Str("hello");
434   EXPECT_TRUE(Str.consume_back(""));
435   EXPECT_EQ("hello", Str);
436   EXPECT_TRUE(Str.consume_back("lo"));
437   EXPECT_EQ("hel", Str);
438   EXPECT_FALSE(Str.consume_back("helhel"));
439   EXPECT_EQ("hel", Str);
440   EXPECT_FALSE(Str.consume_back("hle"));
441   EXPECT_EQ("hel", Str);
442   EXPECT_TRUE(Str.consume_back("hel"));
443   EXPECT_EQ("", Str);
444   EXPECT_FALSE(Str.consume_back("h"));
445   EXPECT_TRUE(Str.consume_back(""));
446 }
447 
448 TEST(StringRefTest, ConsumeBackInsensitive) {
449   StringRef Str("heLLo");
450   EXPECT_TRUE(Str.consume_back_insensitive(""));
451   EXPECT_EQ("heLLo", Str);
452   EXPECT_FALSE(Str.consume_back("lO"));
453   EXPECT_EQ("heLLo", Str);
454   EXPECT_TRUE(Str.consume_back_insensitive("lO"));
455   EXPECT_EQ("heL", Str);
456   EXPECT_FALSE(Str.consume_back_insensitive("helhel"));
457   EXPECT_EQ("heL", Str);
458   EXPECT_FALSE(Str.consume_back_insensitive("hle"));
459   EXPECT_EQ("heL", Str);
460   EXPECT_TRUE(Str.consume_back_insensitive("hEl"));
461   EXPECT_EQ("", Str);
462   EXPECT_FALSE(Str.consume_back_insensitive("h"));
463   EXPECT_TRUE(Str.consume_back_insensitive(""));
464 }
465 
466 TEST(StringRefTest, Find) {
467   StringRef Str("helloHELLO");
468   StringRef LongStr("hellx xello hell ello world foo bar hello HELLO");
469 
470   struct {
471     StringRef Str;
472     char C;
473     std::size_t From;
474     std::size_t Pos;
475     std::size_t InsensitivePos;
476   } CharExpectations[] = {
477       {Str, 'h', 0U, 0U, 0U},
478       {Str, 'e', 0U, 1U, 1U},
479       {Str, 'l', 0U, 2U, 2U},
480       {Str, 'l', 3U, 3U, 3U},
481       {Str, 'o', 0U, 4U, 4U},
482       {Str, 'L', 0U, 7U, 2U},
483       {Str, 'z', 0U, StringRef::npos, StringRef::npos},
484   };
485 
486   struct {
487     StringRef Str;
488     llvm::StringRef S;
489     std::size_t From;
490     std::size_t Pos;
491     std::size_t InsensitivePos;
492   } StrExpectations[] = {
493       {Str, "helloword", 0, StringRef::npos, StringRef::npos},
494       {Str, "hello", 0, 0U, 0U},
495       {Str, "ello", 0, 1U, 1U},
496       {Str, "zz", 0, StringRef::npos, StringRef::npos},
497       {Str, "ll", 2U, 2U, 2U},
498       {Str, "ll", 3U, StringRef::npos, 7U},
499       {Str, "LL", 2U, 7U, 2U},
500       {Str, "LL", 3U, 7U, 7U},
501       {Str, "", 0U, 0U, 0U},
502       {LongStr, "hello", 0U, 36U, 36U},
503       {LongStr, "foo", 0U, 28U, 28U},
504       {LongStr, "hell", 2U, 12U, 12U},
505       {LongStr, "HELL", 2U, 42U, 12U},
506       {LongStr, "", 0U, 0U, 0U}};
507 
508   for (auto &E : CharExpectations) {
509     EXPECT_EQ(E.Pos, E.Str.find(E.C, E.From));
510     EXPECT_EQ(E.InsensitivePos, E.Str.find_insensitive(E.C, E.From));
511     EXPECT_EQ(E.InsensitivePos, E.Str.find_insensitive(toupper(E.C), E.From));
512   }
513 
514   for (auto &E : StrExpectations) {
515     EXPECT_EQ(E.Pos, E.Str.find(E.S, E.From));
516     EXPECT_EQ(E.InsensitivePos, E.Str.find_insensitive(E.S, E.From));
517     EXPECT_EQ(E.InsensitivePos, E.Str.find_insensitive(E.S.upper(), E.From));
518   }
519 
520   EXPECT_EQ(3U, Str.rfind('l'));
521   EXPECT_EQ(StringRef::npos, Str.rfind('z'));
522   EXPECT_EQ(StringRef::npos, Str.rfind("helloworld"));
523   EXPECT_EQ(0U, Str.rfind("hello"));
524   EXPECT_EQ(1U, Str.rfind("ello"));
525   EXPECT_EQ(StringRef::npos, Str.rfind("zz"));
526 
527   EXPECT_EQ(8U, Str.rfind_insensitive('l'));
528   EXPECT_EQ(8U, Str.rfind_insensitive('L'));
529   EXPECT_EQ(StringRef::npos, Str.rfind_insensitive('z'));
530   EXPECT_EQ(StringRef::npos, Str.rfind_insensitive("HELLOWORLD"));
531   EXPECT_EQ(5U, Str.rfind("HELLO"));
532   EXPECT_EQ(6U, Str.rfind("ELLO"));
533   EXPECT_EQ(StringRef::npos, Str.rfind("ZZ"));
534 
535   EXPECT_EQ(2U, Str.find_first_of('l'));
536   EXPECT_EQ(1U, Str.find_first_of("el"));
537   EXPECT_EQ(StringRef::npos, Str.find_first_of("xyz"));
538 
539   Str = "hello";
540   EXPECT_EQ(1U, Str.find_first_not_of('h'));
541   EXPECT_EQ(4U, Str.find_first_not_of("hel"));
542   EXPECT_EQ(StringRef::npos, Str.find_first_not_of("hello"));
543 
544   EXPECT_EQ(3U, Str.find_last_not_of('o'));
545   EXPECT_EQ(1U, Str.find_last_not_of("lo"));
546   EXPECT_EQ(StringRef::npos, Str.find_last_not_of("helo"));
547 }
548 
549 TEST(StringRefTest, Count) {
550   StringRef Str("hello");
551   EXPECT_EQ(2U, Str.count('l'));
552   EXPECT_EQ(1U, Str.count('o'));
553   EXPECT_EQ(0U, Str.count('z'));
554   EXPECT_EQ(0U, Str.count("helloworld"));
555   EXPECT_EQ(1U, Str.count("hello"));
556   EXPECT_EQ(1U, Str.count("ello"));
557   EXPECT_EQ(0U, Str.count("zz"));
558   EXPECT_EQ(0U, Str.count(""));
559 
560   StringRef OverlappingAbba("abbabba");
561   EXPECT_EQ(1U, OverlappingAbba.count("abba"));
562   StringRef NonOverlappingAbba("abbaabba");
563   EXPECT_EQ(2U, NonOverlappingAbba.count("abba"));
564   StringRef ComplexAbba("abbabbaxyzabbaxyz");
565   EXPECT_EQ(2U, ComplexAbba.count("abba"));
566 }
567 
568 TEST(StringRefTest, EditDistance) {
569   StringRef Hello("hello");
570   EXPECT_EQ(2U, Hello.edit_distance("hill"));
571 
572   StringRef Industry("industry");
573   EXPECT_EQ(6U, Industry.edit_distance("interest"));
574 
575   StringRef Soylent("soylent green is people");
576   EXPECT_EQ(19U, Soylent.edit_distance("people soiled our green"));
577   EXPECT_EQ(26U, Soylent.edit_distance("people soiled our green",
578                                       /* allow replacements = */ false));
579   EXPECT_EQ(9U, Soylent.edit_distance("people soiled our green",
580                                       /* allow replacements = */ true,
581                                       /* max edit distance = */ 8));
582   EXPECT_EQ(53U, Soylent.edit_distance("people soiled our green "
583                                        "people soiled our green "
584                                        "people soiled our green "));
585 }
586 
587 TEST(StringRefTest, EditDistanceInsensitive) {
588   StringRef Hello("HELLO");
589   EXPECT_EQ(2U, Hello.edit_distance_insensitive("hill"));
590   EXPECT_EQ(0U, Hello.edit_distance_insensitive("hello"));
591 
592   StringRef Industry("InDuStRy");
593   EXPECT_EQ(6U, Industry.edit_distance_insensitive("iNtErEsT"));
594 }
595 
596 TEST(StringRefTest, Misc) {
597   std::string Storage;
598   raw_string_ostream OS(Storage);
599   OS << StringRef("hello");
600   EXPECT_EQ("hello", OS.str());
601 }
602 
603 TEST(StringRefTest, Hashing) {
604   EXPECT_EQ(hash_value(std::string()), hash_value(StringRef()));
605   EXPECT_EQ(hash_value(std::string()), hash_value(StringRef("")));
606   std::string S = "hello world";
607   hash_code H = hash_value(S);
608   EXPECT_EQ(H, hash_value(StringRef("hello world")));
609   EXPECT_EQ(H, hash_value(StringRef(S)));
610   EXPECT_NE(H, hash_value(StringRef("hello worl")));
611   EXPECT_EQ(hash_value(std::string("hello worl")),
612             hash_value(StringRef("hello worl")));
613   EXPECT_NE(H, hash_value(StringRef("hello world ")));
614   EXPECT_EQ(hash_value(std::string("hello world ")),
615             hash_value(StringRef("hello world ")));
616   EXPECT_EQ(H, hash_value(StringRef("hello world\0")));
617   EXPECT_NE(hash_value(std::string("ello worl")),
618             hash_value(StringRef("hello world").slice(1, -1)));
619 }
620 
621 struct UnsignedPair {
622   const char *Str;
623   uint64_t Expected;
624 } Unsigned[] =
625   { {"0", 0}
626   , {"255", 255}
627   , {"256", 256}
628   , {"65535", 65535}
629   , {"65536", 65536}
630   , {"4294967295", 4294967295ULL}
631   , {"4294967296", 4294967296ULL}
632   , {"18446744073709551615", 18446744073709551615ULL}
633   , {"042", 34}
634   , {"0x42", 66}
635   , {"0b101010", 42}
636   };
637 
638 struct SignedPair {
639   const char *Str;
640   int64_t Expected;
641 } Signed[] =
642   { {"0", 0}
643   , {"-0", 0}
644   , {"127", 127}
645   , {"128", 128}
646   , {"-128", -128}
647   , {"-129", -129}
648   , {"32767", 32767}
649   , {"32768", 32768}
650   , {"-32768", -32768}
651   , {"-32769", -32769}
652   , {"2147483647", 2147483647LL}
653   , {"2147483648", 2147483648LL}
654   , {"-2147483648", -2147483648LL}
655   , {"-2147483649", -2147483649LL}
656   , {"-9223372036854775808", -(9223372036854775807LL) - 1}
657   , {"042", 34}
658   , {"0x42", 66}
659   , {"0b101010", 42}
660   , {"-042", -34}
661   , {"-0x42", -66}
662   , {"-0b101010", -42}
663   };
664 
665 TEST(StringRefTest, getAsInteger) {
666   uint8_t U8;
667   uint16_t U16;
668   uint32_t U32;
669   uint64_t U64;
670 
671   for (size_t i = 0; i < array_lengthof(Unsigned); ++i) {
672     bool U8Success = StringRef(Unsigned[i].Str).getAsInteger(0, U8);
673     if (static_cast<uint8_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
674       ASSERT_FALSE(U8Success);
675       EXPECT_EQ(U8, Unsigned[i].Expected);
676     } else {
677       ASSERT_TRUE(U8Success);
678     }
679     bool U16Success = StringRef(Unsigned[i].Str).getAsInteger(0, U16);
680     if (static_cast<uint16_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
681       ASSERT_FALSE(U16Success);
682       EXPECT_EQ(U16, Unsigned[i].Expected);
683     } else {
684       ASSERT_TRUE(U16Success);
685     }
686     bool U32Success = StringRef(Unsigned[i].Str).getAsInteger(0, U32);
687     if (static_cast<uint32_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
688       ASSERT_FALSE(U32Success);
689       EXPECT_EQ(U32, Unsigned[i].Expected);
690     } else {
691       ASSERT_TRUE(U32Success);
692     }
693     bool U64Success = StringRef(Unsigned[i].Str).getAsInteger(0, U64);
694     ASSERT_FALSE(U64Success);
695     EXPECT_EQ(U64, Unsigned[i].Expected);
696   }
697 
698   int8_t S8;
699   int16_t S16;
700   int32_t S32;
701   int64_t S64;
702 
703   for (size_t i = 0; i < array_lengthof(Signed); ++i) {
704     bool S8Success = StringRef(Signed[i].Str).getAsInteger(0, S8);
705     if (static_cast<int8_t>(Signed[i].Expected) == Signed[i].Expected) {
706       ASSERT_FALSE(S8Success);
707       EXPECT_EQ(S8, Signed[i].Expected);
708     } else {
709       ASSERT_TRUE(S8Success);
710     }
711     bool S16Success = StringRef(Signed[i].Str).getAsInteger(0, S16);
712     if (static_cast<int16_t>(Signed[i].Expected) == Signed[i].Expected) {
713       ASSERT_FALSE(S16Success);
714       EXPECT_EQ(S16, Signed[i].Expected);
715     } else {
716       ASSERT_TRUE(S16Success);
717     }
718     bool S32Success = StringRef(Signed[i].Str).getAsInteger(0, S32);
719     if (static_cast<int32_t>(Signed[i].Expected) == Signed[i].Expected) {
720       ASSERT_FALSE(S32Success);
721       EXPECT_EQ(S32, Signed[i].Expected);
722     } else {
723       ASSERT_TRUE(S32Success);
724     }
725     bool S64Success = StringRef(Signed[i].Str).getAsInteger(0, S64);
726     ASSERT_FALSE(S64Success);
727     EXPECT_EQ(S64, Signed[i].Expected);
728   }
729 }
730 
731 
732 static const char* BadStrings[] = {
733     ""                      // empty string
734   , "18446744073709551617"  // value just over max
735   , "123456789012345678901" // value way too large
736   , "4t23v"                 // illegal decimal characters
737   , "0x123W56"              // illegal hex characters
738   , "0b2"                   // illegal bin characters
739   , "08"                    // illegal oct characters
740   , "0o8"                   // illegal oct characters
741   , "-123"                  // negative unsigned value
742   , "0x"
743   , "0b"
744 };
745 
746 
747 TEST(StringRefTest, getAsUnsignedIntegerBadStrings) {
748   unsigned long long U64;
749   for (size_t i = 0; i < array_lengthof(BadStrings); ++i) {
750     bool IsBadNumber = StringRef(BadStrings[i]).getAsInteger(0, U64);
751     ASSERT_TRUE(IsBadNumber);
752   }
753 }
754 
755 struct ConsumeUnsignedPair {
756   const char *Str;
757   uint64_t Expected;
758   const char *Leftover;
759 } ConsumeUnsigned[] = {
760     {"0", 0, ""},
761     {"255", 255, ""},
762     {"256", 256, ""},
763     {"65535", 65535, ""},
764     {"65536", 65536, ""},
765     {"4294967295", 4294967295ULL, ""},
766     {"4294967296", 4294967296ULL, ""},
767     {"255A376", 255, "A376"},
768     {"18446744073709551615", 18446744073709551615ULL, ""},
769     {"18446744073709551615ABC", 18446744073709551615ULL, "ABC"},
770     {"042", 34, ""},
771     {"0x42", 66, ""},
772     {"0x42-0x34", 66, "-0x34"},
773     {"0b101010", 42, ""},
774     {"0429F", 042, "9F"},            // Auto-sensed octal radix, invalid digit
775     {"0x42G12", 0x42, "G12"},        // Auto-sensed hex radix, invalid digit
776     {"0b10101020101", 42, "20101"}}; // Auto-sensed binary radix, invalid digit.
777 
778 struct ConsumeSignedPair {
779   const char *Str;
780   int64_t Expected;
781   const char *Leftover;
782 } ConsumeSigned[] = {
783     {"0", 0, ""},
784     {"-0", 0, ""},
785     {"0-1", 0, "-1"},
786     {"-0-1", 0, "-1"},
787     {"127", 127, ""},
788     {"128", 128, ""},
789     {"127-1", 127, "-1"},
790     {"128-1", 128, "-1"},
791     {"-128", -128, ""},
792     {"-129", -129, ""},
793     {"-128-1", -128, "-1"},
794     {"-129-1", -129, "-1"},
795     {"32767", 32767, ""},
796     {"32768", 32768, ""},
797     {"32767-1", 32767, "-1"},
798     {"32768-1", 32768, "-1"},
799     {"-32768", -32768, ""},
800     {"-32769", -32769, ""},
801     {"-32768-1", -32768, "-1"},
802     {"-32769-1", -32769, "-1"},
803     {"2147483647", 2147483647LL, ""},
804     {"2147483648", 2147483648LL, ""},
805     {"2147483647-1", 2147483647LL, "-1"},
806     {"2147483648-1", 2147483648LL, "-1"},
807     {"-2147483648", -2147483648LL, ""},
808     {"-2147483649", -2147483649LL, ""},
809     {"-2147483648-1", -2147483648LL, "-1"},
810     {"-2147483649-1", -2147483649LL, "-1"},
811     {"-9223372036854775808", -(9223372036854775807LL) - 1, ""},
812     {"-9223372036854775808-1", -(9223372036854775807LL) - 1, "-1"},
813     {"042", 34, ""},
814     {"042-1", 34, "-1"},
815     {"0x42", 66, ""},
816     {"0x42-1", 66, "-1"},
817     {"0b101010", 42, ""},
818     {"0b101010-1", 42, "-1"},
819     {"-042", -34, ""},
820     {"-042-1", -34, "-1"},
821     {"-0x42", -66, ""},
822     {"-0x42-1", -66, "-1"},
823     {"-0b101010", -42, ""},
824     {"-0b101010-1", -42, "-1"}};
825 
826 TEST(StringRefTest, consumeIntegerUnsigned) {
827   uint8_t U8;
828   uint16_t U16;
829   uint32_t U32;
830   uint64_t U64;
831 
832   for (size_t i = 0; i < array_lengthof(ConsumeUnsigned); ++i) {
833     StringRef Str = ConsumeUnsigned[i].Str;
834     bool U8Success = Str.consumeInteger(0, U8);
835     if (static_cast<uint8_t>(ConsumeUnsigned[i].Expected) ==
836         ConsumeUnsigned[i].Expected) {
837       ASSERT_FALSE(U8Success);
838       EXPECT_EQ(U8, ConsumeUnsigned[i].Expected);
839       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
840     } else {
841       ASSERT_TRUE(U8Success);
842     }
843 
844     Str = ConsumeUnsigned[i].Str;
845     bool U16Success = Str.consumeInteger(0, U16);
846     if (static_cast<uint16_t>(ConsumeUnsigned[i].Expected) ==
847         ConsumeUnsigned[i].Expected) {
848       ASSERT_FALSE(U16Success);
849       EXPECT_EQ(U16, ConsumeUnsigned[i].Expected);
850       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
851     } else {
852       ASSERT_TRUE(U16Success);
853     }
854 
855     Str = ConsumeUnsigned[i].Str;
856     bool U32Success = Str.consumeInteger(0, U32);
857     if (static_cast<uint32_t>(ConsumeUnsigned[i].Expected) ==
858         ConsumeUnsigned[i].Expected) {
859       ASSERT_FALSE(U32Success);
860       EXPECT_EQ(U32, ConsumeUnsigned[i].Expected);
861       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
862     } else {
863       ASSERT_TRUE(U32Success);
864     }
865 
866     Str = ConsumeUnsigned[i].Str;
867     bool U64Success = Str.consumeInteger(0, U64);
868     ASSERT_FALSE(U64Success);
869     EXPECT_EQ(U64, ConsumeUnsigned[i].Expected);
870     EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
871   }
872 }
873 
874 TEST(StringRefTest, consumeIntegerSigned) {
875   int8_t S8;
876   int16_t S16;
877   int32_t S32;
878   int64_t S64;
879 
880   for (size_t i = 0; i < array_lengthof(ConsumeSigned); ++i) {
881     StringRef Str = ConsumeSigned[i].Str;
882     bool S8Success = Str.consumeInteger(0, S8);
883     if (static_cast<int8_t>(ConsumeSigned[i].Expected) ==
884         ConsumeSigned[i].Expected) {
885       ASSERT_FALSE(S8Success);
886       EXPECT_EQ(S8, ConsumeSigned[i].Expected);
887       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
888     } else {
889       ASSERT_TRUE(S8Success);
890     }
891 
892     Str = ConsumeSigned[i].Str;
893     bool S16Success = Str.consumeInteger(0, S16);
894     if (static_cast<int16_t>(ConsumeSigned[i].Expected) ==
895         ConsumeSigned[i].Expected) {
896       ASSERT_FALSE(S16Success);
897       EXPECT_EQ(S16, ConsumeSigned[i].Expected);
898       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
899     } else {
900       ASSERT_TRUE(S16Success);
901     }
902 
903     Str = ConsumeSigned[i].Str;
904     bool S32Success = Str.consumeInteger(0, S32);
905     if (static_cast<int32_t>(ConsumeSigned[i].Expected) ==
906         ConsumeSigned[i].Expected) {
907       ASSERT_FALSE(S32Success);
908       EXPECT_EQ(S32, ConsumeSigned[i].Expected);
909       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
910     } else {
911       ASSERT_TRUE(S32Success);
912     }
913 
914     Str = ConsumeSigned[i].Str;
915     bool S64Success = Str.consumeInteger(0, S64);
916     ASSERT_FALSE(S64Success);
917     EXPECT_EQ(S64, ConsumeSigned[i].Expected);
918     EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
919   }
920 }
921 
922 struct GetDoubleStrings {
923   const char *Str;
924   bool AllowInexact;
925   bool ShouldFail;
926   double D;
927 } DoubleStrings[] = {{"0", false, false, 0.0},
928                      {"0.0", false, false, 0.0},
929                      {"-0.0", false, false, -0.0},
930                      {"123.45", false, true, 123.45},
931                      {"123.45", true, false, 123.45},
932                      {"1.8e308", true, false, std::numeric_limits<double>::infinity()},
933                      {"1.8e308", false, true, std::numeric_limits<double>::infinity()},
934                      {"0x0.0000000000001P-1023", false, true, 0.0},
935                      {"0x0.0000000000001P-1023", true, false, 0.0},
936                     };
937 
938 TEST(StringRefTest, getAsDouble) {
939   for (const auto &Entry : DoubleStrings) {
940     double Result;
941     StringRef S(Entry.Str);
942     EXPECT_EQ(Entry.ShouldFail, S.getAsDouble(Result, Entry.AllowInexact));
943     if (!Entry.ShouldFail) {
944       EXPECT_EQ(Result, Entry.D);
945     }
946   }
947 }
948 
949 static const char *join_input[] = { "a", "b", "c" };
950 static const char join_result1[] = "a";
951 static const char join_result2[] = "a:b:c";
952 static const char join_result3[] = "a::b::c";
953 
954 TEST(StringRefTest, joinStrings) {
955   std::vector<StringRef> v1;
956   std::vector<std::string> v2;
957   for (size_t i = 0; i < array_lengthof(join_input); ++i) {
958     v1.push_back(join_input[i]);
959     v2.push_back(join_input[i]);
960   }
961 
962   bool v1_join1 = join(v1.begin(), v1.begin() + 1, ":") == join_result1;
963   EXPECT_TRUE(v1_join1);
964   bool v1_join2 = join(v1.begin(), v1.end(), ":") == join_result2;
965   EXPECT_TRUE(v1_join2);
966   bool v1_join3 = join(v1.begin(), v1.end(), "::") == join_result3;
967   EXPECT_TRUE(v1_join3);
968 
969   bool v2_join1 = join(v2.begin(), v2.begin() + 1, ":") == join_result1;
970   EXPECT_TRUE(v2_join1);
971   bool v2_join2 = join(v2.begin(), v2.end(), ":") == join_result2;
972   EXPECT_TRUE(v2_join2);
973   bool v2_join3 = join(v2.begin(), v2.end(), "::") == join_result3;
974   EXPECT_TRUE(v2_join3);
975   v2_join3 = join(v2, "::") == join_result3;
976   EXPECT_TRUE(v2_join3);
977 }
978 
979 
980 TEST(StringRefTest, AllocatorCopy) {
981   BumpPtrAllocator Alloc;
982   // First test empty strings.  We don't want these to allocate anything on the
983   // allocator.
984   StringRef StrEmpty = "";
985   StringRef StrEmptyc = StrEmpty.copy(Alloc);
986   EXPECT_TRUE(StrEmpty.equals(StrEmptyc));
987   EXPECT_EQ(StrEmptyc.data(), nullptr);
988   EXPECT_EQ(StrEmptyc.size(), 0u);
989   EXPECT_EQ(Alloc.getTotalMemory(), 0u);
990 
991   StringRef Str1 = "hello";
992   StringRef Str2 = "bye";
993   StringRef Str1c = Str1.copy(Alloc);
994   StringRef Str2c = Str2.copy(Alloc);
995   EXPECT_TRUE(Str1.equals(Str1c));
996   EXPECT_NE(Str1.data(), Str1c.data());
997   EXPECT_TRUE(Str2.equals(Str2c));
998   EXPECT_NE(Str2.data(), Str2c.data());
999 }
1000 
1001 TEST(StringRefTest, Drop) {
1002   StringRef Test("StringRefTest::Drop");
1003 
1004   StringRef Dropped = Test.drop_front(5);
1005   EXPECT_EQ(Dropped, "gRefTest::Drop");
1006 
1007   Dropped = Test.drop_back(5);
1008   EXPECT_EQ(Dropped, "StringRefTest:");
1009 
1010   Dropped = Test.drop_front(0);
1011   EXPECT_EQ(Dropped, Test);
1012 
1013   Dropped = Test.drop_back(0);
1014   EXPECT_EQ(Dropped, Test);
1015 
1016   Dropped = Test.drop_front(Test.size());
1017   EXPECT_TRUE(Dropped.empty());
1018 
1019   Dropped = Test.drop_back(Test.size());
1020   EXPECT_TRUE(Dropped.empty());
1021 }
1022 
1023 TEST(StringRefTest, Take) {
1024   StringRef Test("StringRefTest::Take");
1025 
1026   StringRef Taken = Test.take_front(5);
1027   EXPECT_EQ(Taken, "Strin");
1028 
1029   Taken = Test.take_back(5);
1030   EXPECT_EQ(Taken, ":Take");
1031 
1032   Taken = Test.take_front(Test.size());
1033   EXPECT_EQ(Taken, Test);
1034 
1035   Taken = Test.take_back(Test.size());
1036   EXPECT_EQ(Taken, Test);
1037 
1038   Taken = Test.take_front(0);
1039   EXPECT_TRUE(Taken.empty());
1040 
1041   Taken = Test.take_back(0);
1042   EXPECT_TRUE(Taken.empty());
1043 }
1044 
1045 TEST(StringRefTest, FindIf) {
1046   StringRef Punct("Test.String");
1047   StringRef NoPunct("ABCDEFG");
1048   StringRef Empty;
1049 
1050   auto IsPunct = [](char c) { return ::ispunct(c); };
1051   auto IsAlpha = [](char c) { return ::isalpha(c); };
1052   EXPECT_EQ(4U, Punct.find_if(IsPunct));
1053   EXPECT_EQ(StringRef::npos, NoPunct.find_if(IsPunct));
1054   EXPECT_EQ(StringRef::npos, Empty.find_if(IsPunct));
1055 
1056   EXPECT_EQ(4U, Punct.find_if_not(IsAlpha));
1057   EXPECT_EQ(StringRef::npos, NoPunct.find_if_not(IsAlpha));
1058   EXPECT_EQ(StringRef::npos, Empty.find_if_not(IsAlpha));
1059 }
1060 
1061 TEST(StringRefTest, TakeWhileUntil) {
1062   StringRef Test("String With 1 Number");
1063 
1064   StringRef Taken = Test.take_while([](char c) { return ::isdigit(c); });
1065   EXPECT_EQ("", Taken);
1066 
1067   Taken = Test.take_until([](char c) { return ::isdigit(c); });
1068   EXPECT_EQ("String With ", Taken);
1069 
1070   Taken = Test.take_while([](char c) { return true; });
1071   EXPECT_EQ(Test, Taken);
1072 
1073   Taken = Test.take_until([](char c) { return true; });
1074   EXPECT_EQ("", Taken);
1075 
1076   Test = "";
1077   Taken = Test.take_while([](char c) { return true; });
1078   EXPECT_EQ("", Taken);
1079 }
1080 
1081 TEST(StringRefTest, DropWhileUntil) {
1082   StringRef Test("String With 1 Number");
1083 
1084   StringRef Taken = Test.drop_while([](char c) { return ::isdigit(c); });
1085   EXPECT_EQ(Test, Taken);
1086 
1087   Taken = Test.drop_until([](char c) { return ::isdigit(c); });
1088   EXPECT_EQ("1 Number", Taken);
1089 
1090   Taken = Test.drop_while([](char c) { return true; });
1091   EXPECT_EQ("", Taken);
1092 
1093   Taken = Test.drop_until([](char c) { return true; });
1094   EXPECT_EQ(Test, Taken);
1095 
1096   StringRef EmptyString = "";
1097   Taken = EmptyString.drop_while([](char c) { return true; });
1098   EXPECT_EQ("", Taken);
1099 }
1100 
1101 TEST(StringRefTest, StringLiteral) {
1102   constexpr StringRef StringRefs[] = {"Foo", "Bar"};
1103   EXPECT_EQ(StringRef("Foo"), StringRefs[0]);
1104   EXPECT_EQ(3u, (std::integral_constant<size_t, StringRefs[0].size()>::value));
1105   EXPECT_EQ(false, (std::integral_constant<bool, StringRefs[0].empty()>::value));
1106   EXPECT_EQ(StringRef("Bar"), StringRefs[1]);
1107 
1108   constexpr StringLiteral Strings[] = {"Foo", "Bar"};
1109   EXPECT_EQ(StringRef("Foo"), Strings[0]);
1110   EXPECT_EQ(3u, (std::integral_constant<size_t, Strings[0].size()>::value));
1111   EXPECT_EQ(false, (std::integral_constant<bool, Strings[0].empty()>::value));
1112   EXPECT_EQ(StringRef("Bar"), Strings[1]);
1113 }
1114 
1115 // Check gtest prints StringRef as a string instead of a container of chars.
1116 // The code is in utils/unittest/googletest/internal/custom/gtest-printers.h
1117 TEST(StringRefTest, GTestPrinter) {
1118   EXPECT_EQ(R"("foo")", ::testing::PrintToString(StringRef("foo")));
1119 }
1120 
1121 TEST(StringRefTest, LFLineEnding) {
1122   constexpr StringRef Cases[] = {"\nDoggo\nPupper", "Floofer\n", "Woofer"};
1123   EXPECT_EQ(StringRef("\n"), Cases[0].detectEOL());
1124   EXPECT_EQ(StringRef("\n"), Cases[1].detectEOL());
1125   EXPECT_EQ(StringRef("\n"), Cases[2].detectEOL());
1126 }
1127 
1128 TEST(StringRefTest, CRLineEnding) {
1129   constexpr StringRef Cases[] = {"\rDoggo\rPupper", "Floofer\r", "Woo\rfer\n"};
1130   EXPECT_EQ(StringRef("\r"), Cases[0].detectEOL());
1131   EXPECT_EQ(StringRef("\r"), Cases[1].detectEOL());
1132   EXPECT_EQ(StringRef("\r"), Cases[2].detectEOL());
1133 }
1134 
1135 TEST(StringRefTest, CRLFLineEnding) {
1136   constexpr StringRef Cases[] = {"\r\nDoggo\r\nPupper", "Floofer\r\n",
1137                                  "Woofer\r\nSubWoofer\n"};
1138   EXPECT_EQ(StringRef("\r\n"), Cases[0].detectEOL());
1139   EXPECT_EQ(StringRef("\r\n"), Cases[1].detectEOL());
1140   EXPECT_EQ(StringRef("\r\n"), Cases[2].detectEOL());
1141 }
1142 
1143 TEST(StringRefTest, LFCRLineEnding) {
1144   constexpr StringRef Cases[] = {"\n\rDoggo\n\rPupper", "Floofer\n\r",
1145                                  "Woofer\n\rSubWoofer\n"};
1146   EXPECT_EQ(StringRef("\n\r"), Cases[0].detectEOL());
1147   EXPECT_EQ(StringRef("\n\r"), Cases[1].detectEOL());
1148   EXPECT_EQ(StringRef("\n\r"), Cases[2].detectEOL());
1149 }
1150 
1151 static_assert(std::is_trivially_copyable<StringRef>::value,
1152               "trivially copyable");
1153 
1154 } // end anonymous namespace
1155