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 #if __cplusplus > 201402L
63   EXPECT_EQ("hello", StringRef(std::string_view("hello")));
64 #endif
65 }
66 
TEST(StringRefTest,Conversion)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 
TEST(StringRefTest,EmptyInitializerList)74 TEST(StringRefTest, EmptyInitializerList) {
75   StringRef S = {};
76   EXPECT_TRUE(S.empty());
77 
78   S = {};
79   EXPECT_TRUE(S.empty());
80 }
81 
TEST(StringRefTest,Iteration)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 
TEST(StringRefTest,StringOps)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_lower("aAd"));
102   EXPECT_EQ( 0, StringRef("AaB").compare_lower("aab"));
103   EXPECT_EQ( 1, StringRef("AaB").compare_lower("AAA"));
104   EXPECT_EQ(-1, StringRef("AaB").compare_lower("aaBb"));
105   EXPECT_EQ(-1, StringRef("AaB").compare_lower("bb"));
106   EXPECT_EQ( 1, StringRef("aaBb").compare_lower("AaB"));
107   EXPECT_EQ( 1, StringRef("bb").compare_lower("AaB"));
108   EXPECT_EQ( 1, StringRef("AaB").compare_lower("aA"));
109   EXPECT_EQ( 1, StringRef("\xFF").compare_lower("\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 
TEST(StringRefTest,Operators)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 
TEST(StringRefTest,Substr)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 
TEST(StringRefTest,Slice)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 
TEST(StringRefTest,Split)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 
TEST(StringRefTest,Split2)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 
TEST(StringRefTest,Trim)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 
TEST(StringRefTest,StartsWith)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 
TEST(StringRefTest,StartsWithLower)369 TEST(StringRefTest, StartsWithLower) {
370   StringRef Str("heLLo");
371   EXPECT_TRUE(Str.startswith_lower(""));
372   EXPECT_TRUE(Str.startswith_lower("he"));
373   EXPECT_TRUE(Str.startswith_lower("hell"));
374   EXPECT_TRUE(Str.startswith_lower("HELlo"));
375   EXPECT_FALSE(Str.startswith_lower("helloworld"));
376   EXPECT_FALSE(Str.startswith_lower("hi"));
377 }
378 
TEST(StringRefTest,ConsumeFront)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 
TEST(StringRefTest,EndsWith)395 TEST(StringRefTest, EndsWith) {
396   StringRef Str("hello");
397   EXPECT_TRUE(Str.endswith(""));
398   EXPECT_TRUE(Str.endswith("lo"));
399   EXPECT_FALSE(Str.endswith("helloworld"));
400   EXPECT_FALSE(Str.endswith("worldhello"));
401   EXPECT_FALSE(Str.endswith("so"));
402 }
403 
TEST(StringRefTest,EndsWithLower)404 TEST(StringRefTest, EndsWithLower) {
405   StringRef Str("heLLo");
406   EXPECT_TRUE(Str.endswith_lower(""));
407   EXPECT_TRUE(Str.endswith_lower("lo"));
408   EXPECT_TRUE(Str.endswith_lower("LO"));
409   EXPECT_TRUE(Str.endswith_lower("ELlo"));
410   EXPECT_FALSE(Str.endswith_lower("helloworld"));
411   EXPECT_FALSE(Str.endswith_lower("hi"));
412 }
413 
TEST(StringRefTest,ConsumeBack)414 TEST(StringRefTest, ConsumeBack) {
415   StringRef Str("hello");
416   EXPECT_TRUE(Str.consume_back(""));
417   EXPECT_EQ("hello", Str);
418   EXPECT_TRUE(Str.consume_back("lo"));
419   EXPECT_EQ("hel", Str);
420   EXPECT_FALSE(Str.consume_back("helhel"));
421   EXPECT_EQ("hel", Str);
422   EXPECT_FALSE(Str.consume_back("hle"));
423   EXPECT_EQ("hel", Str);
424   EXPECT_TRUE(Str.consume_back("hel"));
425   EXPECT_EQ("", Str);
426   EXPECT_FALSE(Str.consume_back("h"));
427   EXPECT_TRUE(Str.consume_back(""));
428 }
429 
TEST(StringRefTest,Find)430 TEST(StringRefTest, Find) {
431   StringRef Str("helloHELLO");
432   StringRef LongStr("hellx xello hell ello world foo bar hello HELLO");
433 
434   struct {
435     StringRef Str;
436     char C;
437     std::size_t From;
438     std::size_t Pos;
439     std::size_t LowerPos;
440   } CharExpectations[] = {
441       {Str, 'h', 0U, 0U, 0U},
442       {Str, 'e', 0U, 1U, 1U},
443       {Str, 'l', 0U, 2U, 2U},
444       {Str, 'l', 3U, 3U, 3U},
445       {Str, 'o', 0U, 4U, 4U},
446       {Str, 'L', 0U, 7U, 2U},
447       {Str, 'z', 0U, StringRef::npos, StringRef::npos},
448   };
449 
450   struct {
451     StringRef Str;
452     llvm::StringRef S;
453     std::size_t From;
454     std::size_t Pos;
455     std::size_t LowerPos;
456   } StrExpectations[] = {
457       {Str, "helloword", 0, StringRef::npos, StringRef::npos},
458       {Str, "hello", 0, 0U, 0U},
459       {Str, "ello", 0, 1U, 1U},
460       {Str, "zz", 0, StringRef::npos, StringRef::npos},
461       {Str, "ll", 2U, 2U, 2U},
462       {Str, "ll", 3U, StringRef::npos, 7U},
463       {Str, "LL", 2U, 7U, 2U},
464       {Str, "LL", 3U, 7U, 7U},
465       {Str, "", 0U, 0U, 0U},
466       {LongStr, "hello", 0U, 36U, 36U},
467       {LongStr, "foo", 0U, 28U, 28U},
468       {LongStr, "hell", 2U, 12U, 12U},
469       {LongStr, "HELL", 2U, 42U, 12U},
470       {LongStr, "", 0U, 0U, 0U}};
471 
472   for (auto &E : CharExpectations) {
473     EXPECT_EQ(E.Pos, E.Str.find(E.C, E.From));
474     EXPECT_EQ(E.LowerPos, E.Str.find_lower(E.C, E.From));
475     EXPECT_EQ(E.LowerPos, E.Str.find_lower(toupper(E.C), E.From));
476   }
477 
478   for (auto &E : StrExpectations) {
479     EXPECT_EQ(E.Pos, E.Str.find(E.S, E.From));
480     EXPECT_EQ(E.LowerPos, E.Str.find_lower(E.S, E.From));
481     EXPECT_EQ(E.LowerPos, E.Str.find_lower(E.S.upper(), E.From));
482   }
483 
484   EXPECT_EQ(3U, Str.rfind('l'));
485   EXPECT_EQ(StringRef::npos, Str.rfind('z'));
486   EXPECT_EQ(StringRef::npos, Str.rfind("helloworld"));
487   EXPECT_EQ(0U, Str.rfind("hello"));
488   EXPECT_EQ(1U, Str.rfind("ello"));
489   EXPECT_EQ(StringRef::npos, Str.rfind("zz"));
490 
491   EXPECT_EQ(8U, Str.rfind_lower('l'));
492   EXPECT_EQ(8U, Str.rfind_lower('L'));
493   EXPECT_EQ(StringRef::npos, Str.rfind_lower('z'));
494   EXPECT_EQ(StringRef::npos, Str.rfind_lower("HELLOWORLD"));
495   EXPECT_EQ(5U, Str.rfind("HELLO"));
496   EXPECT_EQ(6U, Str.rfind("ELLO"));
497   EXPECT_EQ(StringRef::npos, Str.rfind("ZZ"));
498 
499   EXPECT_EQ(2U, Str.find_first_of('l'));
500   EXPECT_EQ(1U, Str.find_first_of("el"));
501   EXPECT_EQ(StringRef::npos, Str.find_first_of("xyz"));
502 
503   Str = "hello";
504   EXPECT_EQ(1U, Str.find_first_not_of('h'));
505   EXPECT_EQ(4U, Str.find_first_not_of("hel"));
506   EXPECT_EQ(StringRef::npos, Str.find_first_not_of("hello"));
507 
508   EXPECT_EQ(3U, Str.find_last_not_of('o'));
509   EXPECT_EQ(1U, Str.find_last_not_of("lo"));
510   EXPECT_EQ(StringRef::npos, Str.find_last_not_of("helo"));
511 }
512 
TEST(StringRefTest,Count)513 TEST(StringRefTest, Count) {
514   StringRef Str("hello");
515   EXPECT_EQ(2U, Str.count('l'));
516   EXPECT_EQ(1U, Str.count('o'));
517   EXPECT_EQ(0U, Str.count('z'));
518   EXPECT_EQ(0U, Str.count("helloworld"));
519   EXPECT_EQ(1U, Str.count("hello"));
520   EXPECT_EQ(1U, Str.count("ello"));
521   EXPECT_EQ(0U, Str.count("zz"));
522   EXPECT_EQ(0U, Str.count(""));
523 
524   StringRef OverlappingAbba("abbabba");
525   EXPECT_EQ(1U, OverlappingAbba.count("abba"));
526   StringRef NonOverlappingAbba("abbaabba");
527   EXPECT_EQ(2U, NonOverlappingAbba.count("abba"));
528   StringRef ComplexAbba("abbabbaxyzabbaxyz");
529   EXPECT_EQ(2U, ComplexAbba.count("abba"));
530 }
531 
TEST(StringRefTest,EditDistance)532 TEST(StringRefTest, EditDistance) {
533   StringRef Hello("hello");
534   EXPECT_EQ(2U, Hello.edit_distance("hill"));
535 
536   StringRef Industry("industry");
537   EXPECT_EQ(6U, Industry.edit_distance("interest"));
538 
539   StringRef Soylent("soylent green is people");
540   EXPECT_EQ(19U, Soylent.edit_distance("people soiled our green"));
541   EXPECT_EQ(26U, Soylent.edit_distance("people soiled our green",
542                                       /* allow replacements = */ false));
543   EXPECT_EQ(9U, Soylent.edit_distance("people soiled our green",
544                                       /* allow replacements = */ true,
545                                       /* max edit distance = */ 8));
546   EXPECT_EQ(53U, Soylent.edit_distance("people soiled our green "
547                                        "people soiled our green "
548                                        "people soiled our green "));
549 }
550 
TEST(StringRefTest,Misc)551 TEST(StringRefTest, Misc) {
552   std::string Storage;
553   raw_string_ostream OS(Storage);
554   OS << StringRef("hello");
555   EXPECT_EQ("hello", OS.str());
556 }
557 
TEST(StringRefTest,Hashing)558 TEST(StringRefTest, Hashing) {
559   EXPECT_EQ(hash_value(std::string()), hash_value(StringRef()));
560   EXPECT_EQ(hash_value(std::string()), hash_value(StringRef("")));
561   std::string S = "hello world";
562   hash_code H = hash_value(S);
563   EXPECT_EQ(H, hash_value(StringRef("hello world")));
564   EXPECT_EQ(H, hash_value(StringRef(S)));
565   EXPECT_NE(H, hash_value(StringRef("hello worl")));
566   EXPECT_EQ(hash_value(std::string("hello worl")),
567             hash_value(StringRef("hello worl")));
568   EXPECT_NE(H, hash_value(StringRef("hello world ")));
569   EXPECT_EQ(hash_value(std::string("hello world ")),
570             hash_value(StringRef("hello world ")));
571   EXPECT_EQ(H, hash_value(StringRef("hello world\0")));
572   EXPECT_NE(hash_value(std::string("ello worl")),
573             hash_value(StringRef("hello world").slice(1, -1)));
574 }
575 
576 struct UnsignedPair {
577   const char *Str;
578   uint64_t Expected;
579 } Unsigned[] =
580   { {"0", 0}
581   , {"255", 255}
582   , {"256", 256}
583   , {"65535", 65535}
584   , {"65536", 65536}
585   , {"4294967295", 4294967295ULL}
586   , {"4294967296", 4294967296ULL}
587   , {"18446744073709551615", 18446744073709551615ULL}
588   , {"042", 34}
589   , {"0x42", 66}
590   , {"0b101010", 42}
591   };
592 
593 struct SignedPair {
594   const char *Str;
595   int64_t Expected;
596 } Signed[] =
597   { {"0", 0}
598   , {"-0", 0}
599   , {"127", 127}
600   , {"128", 128}
601   , {"-128", -128}
602   , {"-129", -129}
603   , {"32767", 32767}
604   , {"32768", 32768}
605   , {"-32768", -32768}
606   , {"-32769", -32769}
607   , {"2147483647", 2147483647LL}
608   , {"2147483648", 2147483648LL}
609   , {"-2147483648", -2147483648LL}
610   , {"-2147483649", -2147483649LL}
611   , {"-9223372036854775808", -(9223372036854775807LL) - 1}
612   , {"042", 34}
613   , {"0x42", 66}
614   , {"0b101010", 42}
615   , {"-042", -34}
616   , {"-0x42", -66}
617   , {"-0b101010", -42}
618   };
619 
TEST(StringRefTest,getAsInteger)620 TEST(StringRefTest, getAsInteger) {
621   uint8_t U8;
622   uint16_t U16;
623   uint32_t U32;
624   uint64_t U64;
625 
626   for (size_t i = 0; i < array_lengthof(Unsigned); ++i) {
627     bool U8Success = StringRef(Unsigned[i].Str).getAsInteger(0, U8);
628     if (static_cast<uint8_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
629       ASSERT_FALSE(U8Success);
630       EXPECT_EQ(U8, Unsigned[i].Expected);
631     } else {
632       ASSERT_TRUE(U8Success);
633     }
634     bool U16Success = StringRef(Unsigned[i].Str).getAsInteger(0, U16);
635     if (static_cast<uint16_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
636       ASSERT_FALSE(U16Success);
637       EXPECT_EQ(U16, Unsigned[i].Expected);
638     } else {
639       ASSERT_TRUE(U16Success);
640     }
641     bool U32Success = StringRef(Unsigned[i].Str).getAsInteger(0, U32);
642     if (static_cast<uint32_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
643       ASSERT_FALSE(U32Success);
644       EXPECT_EQ(U32, Unsigned[i].Expected);
645     } else {
646       ASSERT_TRUE(U32Success);
647     }
648     bool U64Success = StringRef(Unsigned[i].Str).getAsInteger(0, U64);
649     if (static_cast<uint64_t>(Unsigned[i].Expected) == Unsigned[i].Expected) {
650       ASSERT_FALSE(U64Success);
651       EXPECT_EQ(U64, Unsigned[i].Expected);
652     } else {
653       ASSERT_TRUE(U64Success);
654     }
655   }
656 
657   int8_t S8;
658   int16_t S16;
659   int32_t S32;
660   int64_t S64;
661 
662   for (size_t i = 0; i < array_lengthof(Signed); ++i) {
663     bool S8Success = StringRef(Signed[i].Str).getAsInteger(0, S8);
664     if (static_cast<int8_t>(Signed[i].Expected) == Signed[i].Expected) {
665       ASSERT_FALSE(S8Success);
666       EXPECT_EQ(S8, Signed[i].Expected);
667     } else {
668       ASSERT_TRUE(S8Success);
669     }
670     bool S16Success = StringRef(Signed[i].Str).getAsInteger(0, S16);
671     if (static_cast<int16_t>(Signed[i].Expected) == Signed[i].Expected) {
672       ASSERT_FALSE(S16Success);
673       EXPECT_EQ(S16, Signed[i].Expected);
674     } else {
675       ASSERT_TRUE(S16Success);
676     }
677     bool S32Success = StringRef(Signed[i].Str).getAsInteger(0, S32);
678     if (static_cast<int32_t>(Signed[i].Expected) == Signed[i].Expected) {
679       ASSERT_FALSE(S32Success);
680       EXPECT_EQ(S32, Signed[i].Expected);
681     } else {
682       ASSERT_TRUE(S32Success);
683     }
684     bool S64Success = StringRef(Signed[i].Str).getAsInteger(0, S64);
685     if (static_cast<int64_t>(Signed[i].Expected) == Signed[i].Expected) {
686       ASSERT_FALSE(S64Success);
687       EXPECT_EQ(S64, Signed[i].Expected);
688     } else {
689       ASSERT_TRUE(S64Success);
690     }
691   }
692 }
693 
694 
695 static const char* BadStrings[] = {
696     ""                      // empty string
697   , "18446744073709551617"  // value just over max
698   , "123456789012345678901" // value way too large
699   , "4t23v"                 // illegal decimal characters
700   , "0x123W56"              // illegal hex characters
701   , "0b2"                   // illegal bin characters
702   , "08"                    // illegal oct characters
703   , "0o8"                   // illegal oct characters
704   , "-123"                  // negative unsigned value
705   , "0x"
706   , "0b"
707 };
708 
709 
TEST(StringRefTest,getAsUnsignedIntegerBadStrings)710 TEST(StringRefTest, getAsUnsignedIntegerBadStrings) {
711   unsigned long long U64;
712   for (size_t i = 0; i < array_lengthof(BadStrings); ++i) {
713     bool IsBadNumber = StringRef(BadStrings[i]).getAsInteger(0, U64);
714     ASSERT_TRUE(IsBadNumber);
715   }
716 }
717 
718 struct ConsumeUnsignedPair {
719   const char *Str;
720   uint64_t Expected;
721   const char *Leftover;
722 } ConsumeUnsigned[] = {
723     {"0", 0, ""},
724     {"255", 255, ""},
725     {"256", 256, ""},
726     {"65535", 65535, ""},
727     {"65536", 65536, ""},
728     {"4294967295", 4294967295ULL, ""},
729     {"4294967296", 4294967296ULL, ""},
730     {"255A376", 255, "A376"},
731     {"18446744073709551615", 18446744073709551615ULL, ""},
732     {"18446744073709551615ABC", 18446744073709551615ULL, "ABC"},
733     {"042", 34, ""},
734     {"0x42", 66, ""},
735     {"0x42-0x34", 66, "-0x34"},
736     {"0b101010", 42, ""},
737     {"0429F", 042, "9F"},            // Auto-sensed octal radix, invalid digit
738     {"0x42G12", 0x42, "G12"},        // Auto-sensed hex radix, invalid digit
739     {"0b10101020101", 42, "20101"}}; // Auto-sensed binary radix, invalid digit.
740 
741 struct ConsumeSignedPair {
742   const char *Str;
743   int64_t Expected;
744   const char *Leftover;
745 } ConsumeSigned[] = {
746     {"0", 0, ""},
747     {"-0", 0, ""},
748     {"0-1", 0, "-1"},
749     {"-0-1", 0, "-1"},
750     {"127", 127, ""},
751     {"128", 128, ""},
752     {"127-1", 127, "-1"},
753     {"128-1", 128, "-1"},
754     {"-128", -128, ""},
755     {"-129", -129, ""},
756     {"-128-1", -128, "-1"},
757     {"-129-1", -129, "-1"},
758     {"32767", 32767, ""},
759     {"32768", 32768, ""},
760     {"32767-1", 32767, "-1"},
761     {"32768-1", 32768, "-1"},
762     {"-32768", -32768, ""},
763     {"-32769", -32769, ""},
764     {"-32768-1", -32768, "-1"},
765     {"-32769-1", -32769, "-1"},
766     {"2147483647", 2147483647LL, ""},
767     {"2147483648", 2147483648LL, ""},
768     {"2147483647-1", 2147483647LL, "-1"},
769     {"2147483648-1", 2147483648LL, "-1"},
770     {"-2147483648", -2147483648LL, ""},
771     {"-2147483649", -2147483649LL, ""},
772     {"-2147483648-1", -2147483648LL, "-1"},
773     {"-2147483649-1", -2147483649LL, "-1"},
774     {"-9223372036854775808", -(9223372036854775807LL) - 1, ""},
775     {"-9223372036854775808-1", -(9223372036854775807LL) - 1, "-1"},
776     {"042", 34, ""},
777     {"042-1", 34, "-1"},
778     {"0x42", 66, ""},
779     {"0x42-1", 66, "-1"},
780     {"0b101010", 42, ""},
781     {"0b101010-1", 42, "-1"},
782     {"-042", -34, ""},
783     {"-042-1", -34, "-1"},
784     {"-0x42", -66, ""},
785     {"-0x42-1", -66, "-1"},
786     {"-0b101010", -42, ""},
787     {"-0b101010-1", -42, "-1"}};
788 
TEST(StringRefTest,consumeIntegerUnsigned)789 TEST(StringRefTest, consumeIntegerUnsigned) {
790   uint8_t U8;
791   uint16_t U16;
792   uint32_t U32;
793   uint64_t U64;
794 
795   for (size_t i = 0; i < array_lengthof(ConsumeUnsigned); ++i) {
796     StringRef Str = ConsumeUnsigned[i].Str;
797     bool U8Success = Str.consumeInteger(0, U8);
798     if (static_cast<uint8_t>(ConsumeUnsigned[i].Expected) ==
799         ConsumeUnsigned[i].Expected) {
800       ASSERT_FALSE(U8Success);
801       EXPECT_EQ(U8, ConsumeUnsigned[i].Expected);
802       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
803     } else {
804       ASSERT_TRUE(U8Success);
805     }
806 
807     Str = ConsumeUnsigned[i].Str;
808     bool U16Success = Str.consumeInteger(0, U16);
809     if (static_cast<uint16_t>(ConsumeUnsigned[i].Expected) ==
810         ConsumeUnsigned[i].Expected) {
811       ASSERT_FALSE(U16Success);
812       EXPECT_EQ(U16, ConsumeUnsigned[i].Expected);
813       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
814     } else {
815       ASSERT_TRUE(U16Success);
816     }
817 
818     Str = ConsumeUnsigned[i].Str;
819     bool U32Success = Str.consumeInteger(0, U32);
820     if (static_cast<uint32_t>(ConsumeUnsigned[i].Expected) ==
821         ConsumeUnsigned[i].Expected) {
822       ASSERT_FALSE(U32Success);
823       EXPECT_EQ(U32, ConsumeUnsigned[i].Expected);
824       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
825     } else {
826       ASSERT_TRUE(U32Success);
827     }
828 
829     Str = ConsumeUnsigned[i].Str;
830     bool U64Success = Str.consumeInteger(0, U64);
831     if (static_cast<uint64_t>(ConsumeUnsigned[i].Expected) ==
832         ConsumeUnsigned[i].Expected) {
833       ASSERT_FALSE(U64Success);
834       EXPECT_EQ(U64, ConsumeUnsigned[i].Expected);
835       EXPECT_EQ(Str, ConsumeUnsigned[i].Leftover);
836     } else {
837       ASSERT_TRUE(U64Success);
838     }
839   }
840 }
841 
TEST(StringRefTest,consumeIntegerSigned)842 TEST(StringRefTest, consumeIntegerSigned) {
843   int8_t S8;
844   int16_t S16;
845   int32_t S32;
846   int64_t S64;
847 
848   for (size_t i = 0; i < array_lengthof(ConsumeSigned); ++i) {
849     StringRef Str = ConsumeSigned[i].Str;
850     bool S8Success = Str.consumeInteger(0, S8);
851     if (static_cast<int8_t>(ConsumeSigned[i].Expected) ==
852         ConsumeSigned[i].Expected) {
853       ASSERT_FALSE(S8Success);
854       EXPECT_EQ(S8, ConsumeSigned[i].Expected);
855       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
856     } else {
857       ASSERT_TRUE(S8Success);
858     }
859 
860     Str = ConsumeSigned[i].Str;
861     bool S16Success = Str.consumeInteger(0, S16);
862     if (static_cast<int16_t>(ConsumeSigned[i].Expected) ==
863         ConsumeSigned[i].Expected) {
864       ASSERT_FALSE(S16Success);
865       EXPECT_EQ(S16, ConsumeSigned[i].Expected);
866       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
867     } else {
868       ASSERT_TRUE(S16Success);
869     }
870 
871     Str = ConsumeSigned[i].Str;
872     bool S32Success = Str.consumeInteger(0, S32);
873     if (static_cast<int32_t>(ConsumeSigned[i].Expected) ==
874         ConsumeSigned[i].Expected) {
875       ASSERT_FALSE(S32Success);
876       EXPECT_EQ(S32, ConsumeSigned[i].Expected);
877       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
878     } else {
879       ASSERT_TRUE(S32Success);
880     }
881 
882     Str = ConsumeSigned[i].Str;
883     bool S64Success = Str.consumeInteger(0, S64);
884     if (static_cast<int64_t>(ConsumeSigned[i].Expected) ==
885         ConsumeSigned[i].Expected) {
886       ASSERT_FALSE(S64Success);
887       EXPECT_EQ(S64, ConsumeSigned[i].Expected);
888       EXPECT_EQ(Str, ConsumeSigned[i].Leftover);
889     } else {
890       ASSERT_TRUE(S64Success);
891     }
892   }
893 }
894 
895 struct GetDoubleStrings {
896   const char *Str;
897   bool AllowInexact;
898   bool ShouldFail;
899   double D;
900 } DoubleStrings[] = {{"0", false, false, 0.0},
901                      {"0.0", false, false, 0.0},
902                      {"-0.0", false, false, -0.0},
903                      {"123.45", false, true, 123.45},
904                      {"123.45", true, false, 123.45},
905                      {"1.8e308", true, false, std::numeric_limits<double>::infinity()},
906                      {"1.8e308", false, true, std::numeric_limits<double>::infinity()},
907                      {"0x0.0000000000001P-1023", false, true, 0.0},
908                      {"0x0.0000000000001P-1023", true, false, 0.0},
909                     };
910 
TEST(StringRefTest,getAsDouble)911 TEST(StringRefTest, getAsDouble) {
912   for (const auto &Entry : DoubleStrings) {
913     double Result;
914     StringRef S(Entry.Str);
915     EXPECT_EQ(Entry.ShouldFail, S.getAsDouble(Result, Entry.AllowInexact));
916     if (!Entry.ShouldFail) {
917       EXPECT_EQ(Result, Entry.D);
918     }
919   }
920 }
921 
922 static const char *join_input[] = { "a", "b", "c" };
923 static const char join_result1[] = "a";
924 static const char join_result2[] = "a:b:c";
925 static const char join_result3[] = "a::b::c";
926 
TEST(StringRefTest,joinStrings)927 TEST(StringRefTest, joinStrings) {
928   std::vector<StringRef> v1;
929   std::vector<std::string> v2;
930   for (size_t i = 0; i < array_lengthof(join_input); ++i) {
931     v1.push_back(join_input[i]);
932     v2.push_back(join_input[i]);
933   }
934 
935   bool v1_join1 = join(v1.begin(), v1.begin() + 1, ":") == join_result1;
936   EXPECT_TRUE(v1_join1);
937   bool v1_join2 = join(v1.begin(), v1.end(), ":") == join_result2;
938   EXPECT_TRUE(v1_join2);
939   bool v1_join3 = join(v1.begin(), v1.end(), "::") == join_result3;
940   EXPECT_TRUE(v1_join3);
941 
942   bool v2_join1 = join(v2.begin(), v2.begin() + 1, ":") == join_result1;
943   EXPECT_TRUE(v2_join1);
944   bool v2_join2 = join(v2.begin(), v2.end(), ":") == join_result2;
945   EXPECT_TRUE(v2_join2);
946   bool v2_join3 = join(v2.begin(), v2.end(), "::") == join_result3;
947   EXPECT_TRUE(v2_join3);
948   v2_join3 = join(v2, "::") == join_result3;
949   EXPECT_TRUE(v2_join3);
950 }
951 
952 
TEST(StringRefTest,AllocatorCopy)953 TEST(StringRefTest, AllocatorCopy) {
954   BumpPtrAllocator Alloc;
955   // First test empty strings.  We don't want these to allocate anything on the
956   // allocator.
957   StringRef StrEmpty = "";
958   StringRef StrEmptyc = StrEmpty.copy(Alloc);
959   EXPECT_TRUE(StrEmpty.equals(StrEmptyc));
960   EXPECT_EQ(StrEmptyc.data(), nullptr);
961   EXPECT_EQ(StrEmptyc.size(), 0u);
962   EXPECT_EQ(Alloc.getTotalMemory(), 0u);
963 
964   StringRef Str1 = "hello";
965   StringRef Str2 = "bye";
966   StringRef Str1c = Str1.copy(Alloc);
967   StringRef Str2c = Str2.copy(Alloc);
968   EXPECT_TRUE(Str1.equals(Str1c));
969   EXPECT_NE(Str1.data(), Str1c.data());
970   EXPECT_TRUE(Str2.equals(Str2c));
971   EXPECT_NE(Str2.data(), Str2c.data());
972 }
973 
TEST(StringRefTest,Drop)974 TEST(StringRefTest, Drop) {
975   StringRef Test("StringRefTest::Drop");
976 
977   StringRef Dropped = Test.drop_front(5);
978   EXPECT_EQ(Dropped, "gRefTest::Drop");
979 
980   Dropped = Test.drop_back(5);
981   EXPECT_EQ(Dropped, "StringRefTest:");
982 
983   Dropped = Test.drop_front(0);
984   EXPECT_EQ(Dropped, Test);
985 
986   Dropped = Test.drop_back(0);
987   EXPECT_EQ(Dropped, Test);
988 
989   Dropped = Test.drop_front(Test.size());
990   EXPECT_TRUE(Dropped.empty());
991 
992   Dropped = Test.drop_back(Test.size());
993   EXPECT_TRUE(Dropped.empty());
994 }
995 
TEST(StringRefTest,Take)996 TEST(StringRefTest, Take) {
997   StringRef Test("StringRefTest::Take");
998 
999   StringRef Taken = Test.take_front(5);
1000   EXPECT_EQ(Taken, "Strin");
1001 
1002   Taken = Test.take_back(5);
1003   EXPECT_EQ(Taken, ":Take");
1004 
1005   Taken = Test.take_front(Test.size());
1006   EXPECT_EQ(Taken, Test);
1007 
1008   Taken = Test.take_back(Test.size());
1009   EXPECT_EQ(Taken, Test);
1010 
1011   Taken = Test.take_front(0);
1012   EXPECT_TRUE(Taken.empty());
1013 
1014   Taken = Test.take_back(0);
1015   EXPECT_TRUE(Taken.empty());
1016 }
1017 
TEST(StringRefTest,FindIf)1018 TEST(StringRefTest, FindIf) {
1019   StringRef Punct("Test.String");
1020   StringRef NoPunct("ABCDEFG");
1021   StringRef Empty;
1022 
1023   auto IsPunct = [](char c) { return ::ispunct(c); };
1024   auto IsAlpha = [](char c) { return ::isalpha(c); };
1025   EXPECT_EQ(4U, Punct.find_if(IsPunct));
1026   EXPECT_EQ(StringRef::npos, NoPunct.find_if(IsPunct));
1027   EXPECT_EQ(StringRef::npos, Empty.find_if(IsPunct));
1028 
1029   EXPECT_EQ(4U, Punct.find_if_not(IsAlpha));
1030   EXPECT_EQ(StringRef::npos, NoPunct.find_if_not(IsAlpha));
1031   EXPECT_EQ(StringRef::npos, Empty.find_if_not(IsAlpha));
1032 }
1033 
TEST(StringRefTest,TakeWhileUntil)1034 TEST(StringRefTest, TakeWhileUntil) {
1035   StringRef Test("String With 1 Number");
1036 
1037   StringRef Taken = Test.take_while([](char c) { return ::isdigit(c); });
1038   EXPECT_EQ("", Taken);
1039 
1040   Taken = Test.take_until([](char c) { return ::isdigit(c); });
1041   EXPECT_EQ("String With ", Taken);
1042 
1043   Taken = Test.take_while([](char c) { return true; });
1044   EXPECT_EQ(Test, Taken);
1045 
1046   Taken = Test.take_until([](char c) { return true; });
1047   EXPECT_EQ("", Taken);
1048 
1049   Test = "";
1050   Taken = Test.take_while([](char c) { return true; });
1051   EXPECT_EQ("", Taken);
1052 }
1053 
TEST(StringRefTest,DropWhileUntil)1054 TEST(StringRefTest, DropWhileUntil) {
1055   StringRef Test("String With 1 Number");
1056 
1057   StringRef Taken = Test.drop_while([](char c) { return ::isdigit(c); });
1058   EXPECT_EQ(Test, Taken);
1059 
1060   Taken = Test.drop_until([](char c) { return ::isdigit(c); });
1061   EXPECT_EQ("1 Number", Taken);
1062 
1063   Taken = Test.drop_while([](char c) { return true; });
1064   EXPECT_EQ("", Taken);
1065 
1066   Taken = Test.drop_until([](char c) { return true; });
1067   EXPECT_EQ(Test, Taken);
1068 
1069   StringRef EmptyString = "";
1070   Taken = EmptyString.drop_while([](char c) { return true; });
1071   EXPECT_EQ("", Taken);
1072 }
1073 
TEST(StringRefTest,StringLiteral)1074 TEST(StringRefTest, StringLiteral) {
1075   constexpr StringRef StringRefs[] = {"Foo", "Bar"};
1076   EXPECT_EQ(StringRef("Foo"), StringRefs[0]);
1077   EXPECT_EQ(StringRef("Bar"), StringRefs[1]);
1078 
1079   constexpr StringLiteral Strings[] = {"Foo", "Bar"};
1080   EXPECT_EQ(StringRef("Foo"), Strings[0]);
1081   EXPECT_EQ(StringRef("Bar"), Strings[1]);
1082 }
1083 
1084 // Check gtest prints StringRef as a string instead of a container of chars.
1085 // The code is in utils/unittest/googletest/internal/custom/gtest-printers.h
TEST(StringRefTest,GTestPrinter)1086 TEST(StringRefTest, GTestPrinter) {
1087   EXPECT_EQ(R"("foo")", ::testing::PrintToString(StringRef("foo")));
1088 }
1089 
1090 static_assert(is_trivially_copyable<StringRef>::value, "trivially copyable");
1091 
1092 } // end anonymous namespace
1093