str_split_test.cc
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1 // Copyright 2017 The Abseil Authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #include "absl/strings/str_split.h"
16 
17 #include <deque>
18 #include <initializer_list>
19 #include <list>
20 #include <map>
21 #include <memory>
22 #include <string>
23 #include <type_traits>
24 #include <unordered_map>
25 #include <unordered_set>
26 #include <vector>
27 
28 #include "gmock/gmock.h"
29 #include "gtest/gtest.h"
30 #include "absl/base/dynamic_annotations.h" // for RunningOnValgrind
31 #include "absl/base/macros.h"
32 #include "absl/strings/numbers.h"
33 
34 namespace {
35 
36 using ::testing::ElementsAre;
37 using ::testing::Pair;
38 using ::testing::UnorderedElementsAre;
39 
40 TEST(Split, TraitsTest) {
42  "");
43  static_assert(
46  std::vector<std::string>>::value,
47  "");
48  static_assert(
50  "");
52  std::vector<absl::string_view>>::value,
53  "");
55  std::map<std::string, std::string>>::value,
56  "");
58  std::map<absl::string_view, absl::string_view>>::value,
59  "");
61  std::map<int, std::string>>::value,
62  "");
64  std::map<std::string, int>>::value,
65  "");
66 }
67 
68 // This tests the overall split API, which is made up of the absl::StrSplit()
69 // function and the Delimiter objects in the absl:: namespace.
70 // This TEST macro is outside of any namespace to require full specification of
71 // namespaces just like callers will need to use.
72 TEST(Split, APIExamples) {
73  {
74  // Passes std::string delimiter. Assumes the default of ByString.
75  std::vector<std::string> v = absl::StrSplit("a,b,c", ","); // NOLINT
76  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
77 
78  // Equivalent to...
79  using absl::ByString;
80  v = absl::StrSplit("a,b,c", ByString(","));
81  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
82 
83  // Equivalent to...
84  EXPECT_THAT(absl::StrSplit("a,b,c", ByString(",")),
85  ElementsAre("a", "b", "c"));
86  }
87 
88  {
89  // Same as above, but using a single character as the delimiter.
90  std::vector<std::string> v = absl::StrSplit("a,b,c", ',');
91  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
92 
93  // Equivalent to...
94  using absl::ByChar;
95  v = absl::StrSplit("a,b,c", ByChar(','));
96  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
97  }
98 
99  {
100  // Uses the Literal std::string "=>" as the delimiter.
101  const std::vector<std::string> v = absl::StrSplit("a=>b=>c", "=>");
102  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
103  }
104 
105  {
106  // The substrings are returned as string_views, eliminating copying.
107  std::vector<absl::string_view> v = absl::StrSplit("a,b,c", ',');
108  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
109  }
110 
111  {
112  // Leading and trailing empty substrings.
113  std::vector<std::string> v = absl::StrSplit(",a,b,c,", ',');
114  EXPECT_THAT(v, ElementsAre("", "a", "b", "c", ""));
115  }
116 
117  {
118  // Splits on a delimiter that is not found.
119  std::vector<std::string> v = absl::StrSplit("abc", ',');
120  EXPECT_THAT(v, ElementsAre("abc"));
121  }
122 
123  {
124  // Splits the input std::string into individual characters by using an empty
125  // std::string as the delimiter.
126  std::vector<std::string> v = absl::StrSplit("abc", "");
127  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
128  }
129 
130  {
131  // Splits std::string data with embedded NUL characters, using NUL as the
132  // delimiter. A simple delimiter of "\0" doesn't work because strlen() will
133  // say that's the empty std::string when constructing the absl::string_view
134  // delimiter. Instead, a non-empty std::string containing NUL can be used as the
135  // delimiter.
136  std::string embedded_nulls("a\0b\0c", 5);
137  std::string null_delim("\0", 1);
138  std::vector<std::string> v = absl::StrSplit(embedded_nulls, null_delim);
139  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
140  }
141 
142  {
143  // Stores first two split strings as the members in a std::pair.
144  std::pair<std::string, std::string> p = absl::StrSplit("a,b,c", ',');
145  EXPECT_EQ("a", p.first);
146  EXPECT_EQ("b", p.second);
147  // "c" is omitted because std::pair can hold only two elements.
148  }
149 
150  {
151  // Results stored in std::set<std::string>
152  std::set<std::string> v = absl::StrSplit("a,b,c,a,b,c,a,b,c", ',');
153  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
154  }
155 
156  {
157  // Uses a non-const char* delimiter.
158  char a[] = ",";
159  char* d = a + 0;
160  std::vector<std::string> v = absl::StrSplit("a,b,c", d);
161  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
162  }
163 
164  {
165  // Results split using either of , or ;
166  using absl::ByAnyChar;
167  std::vector<std::string> v = absl::StrSplit("a,b;c", ByAnyChar(",;"));
168  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
169  }
170 
171  {
172  // Uses the SkipWhitespace predicate.
173  using absl::SkipWhitespace;
174  std::vector<std::string> v =
175  absl::StrSplit(" a , ,,b,", ',', SkipWhitespace());
176  EXPECT_THAT(v, ElementsAre(" a ", "b"));
177  }
178 
179  {
180  // Uses the ByLength delimiter.
181  using absl::ByLength;
182  std::vector<std::string> v = absl::StrSplit("abcdefg", ByLength(3));
183  EXPECT_THAT(v, ElementsAre("abc", "def", "g"));
184  }
185 
186  {
187  // Different forms of initialization / conversion.
188  std::vector<std::string> v1 = absl::StrSplit("a,b,c", ',');
189  EXPECT_THAT(v1, ElementsAre("a", "b", "c"));
190  std::vector<std::string> v2(absl::StrSplit("a,b,c", ','));
191  EXPECT_THAT(v2, ElementsAre("a", "b", "c"));
192  auto v3 = std::vector<std::string>(absl::StrSplit("a,b,c", ','));
193  EXPECT_THAT(v3, ElementsAre("a", "b", "c"));
194  v3 = absl::StrSplit("a,b,c", ',');
195  EXPECT_THAT(v3, ElementsAre("a", "b", "c"));
196  }
197 
198  {
199  // Results stored in a std::map.
200  std::map<std::string, std::string> m = absl::StrSplit("a,1,b,2,a,3", ',');
201  EXPECT_EQ(2, m.size());
202  EXPECT_EQ("3", m["a"]);
203  EXPECT_EQ("2", m["b"]);
204  }
205 
206  {
207  // Results stored in a std::multimap.
208  std::multimap<std::string, std::string> m =
209  absl::StrSplit("a,1,b,2,a,3", ',');
210  EXPECT_EQ(3, m.size());
211  auto it = m.find("a");
212  EXPECT_EQ("1", it->second);
213  ++it;
214  EXPECT_EQ("3", it->second);
215  it = m.find("b");
216  EXPECT_EQ("2", it->second);
217  }
218 
219  {
220  // Demonstrates use in a range-based for loop in C++11.
221  std::string s = "x,x,x,x,x,x,x";
222  for (absl::string_view sp : absl::StrSplit(s, ',')) {
223  EXPECT_EQ("x", sp);
224  }
225  }
226 
227  {
228  // Demonstrates use with a Predicate in a range-based for loop.
229  using absl::SkipWhitespace;
230  std::string s = " ,x,,x,,x,x,x,,";
231  for (absl::string_view sp : absl::StrSplit(s, ',', SkipWhitespace())) {
232  EXPECT_EQ("x", sp);
233  }
234  }
235 
236  {
237  // Demonstrates a "smart" split to std::map using two separate calls to
238  // absl::StrSplit. One call to split the records, and another call to split
239  // the keys and values. This also uses the Limit delimiter so that the
240  // std::string "a=b=c" will split to "a" -> "b=c".
241  std::map<std::string, std::string> m;
242  for (absl::string_view sp : absl::StrSplit("a=b=c,d=e,f=,g", ',')) {
243  m.insert(absl::StrSplit(sp, absl::MaxSplits('=', 1)));
244  }
245  EXPECT_EQ("b=c", m.find("a")->second);
246  EXPECT_EQ("e", m.find("d")->second);
247  EXPECT_EQ("", m.find("f")->second);
248  EXPECT_EQ("", m.find("g")->second);
249  }
250 }
251 
252 //
253 // Tests for SplitIterator
254 //
255 
256 TEST(SplitIterator, Basics) {
257  auto splitter = absl::StrSplit("a,b", ',');
258  auto it = splitter.begin();
259  auto end = splitter.end();
260 
261  EXPECT_NE(it, end);
262  EXPECT_EQ("a", *it); // tests dereference
263  ++it; // tests preincrement
264  EXPECT_NE(it, end);
265  EXPECT_EQ("b",
266  std::string(it->data(), it->size())); // tests dereference as ptr
267  it++; // tests postincrement
268  EXPECT_EQ(it, end);
269 }
270 
271 // Simple Predicate to skip a particular string.
272 class Skip {
273  public:
274  explicit Skip(const std::string& s) : s_(s) {}
275  bool operator()(absl::string_view sp) { return sp != s_; }
276 
277  private:
278  std::string s_;
279 };
280 
281 TEST(SplitIterator, Predicate) {
282  auto splitter = absl::StrSplit("a,b,c", ',', Skip("b"));
283  auto it = splitter.begin();
284  auto end = splitter.end();
285 
286  EXPECT_NE(it, end);
287  EXPECT_EQ("a", *it); // tests dereference
288  ++it; // tests preincrement -- "b" should be skipped here.
289  EXPECT_NE(it, end);
290  EXPECT_EQ("c",
291  std::string(it->data(), it->size())); // tests dereference as ptr
292  it++; // tests postincrement
293  EXPECT_EQ(it, end);
294 }
295 
296 TEST(SplitIterator, EdgeCases) {
297  // Expected input and output, assuming a delimiter of ','
298  struct {
299  std::string in;
300  std::vector<std::string> expect;
301  } specs[] = {
302  {"", {""}},
303  {"foo", {"foo"}},
304  {",", {"", ""}},
305  {",foo", {"", "foo"}},
306  {"foo,", {"foo", ""}},
307  {",foo,", {"", "foo", ""}},
308  {"foo,bar", {"foo", "bar"}},
309  };
310 
311  for (const auto& spec : specs) {
312  SCOPED_TRACE(spec.in);
313  auto splitter = absl::StrSplit(spec.in, ',');
314  auto it = splitter.begin();
315  auto end = splitter.end();
316  for (const auto& expected : spec.expect) {
317  EXPECT_NE(it, end);
318  EXPECT_EQ(expected, *it++);
319  }
320  EXPECT_EQ(it, end);
321  }
322 }
323 
324 TEST(Splitter, Const) {
325  const auto splitter = absl::StrSplit("a,b,c", ',');
326  EXPECT_THAT(splitter, ElementsAre("a", "b", "c"));
327 }
328 
329 TEST(Split, EmptyAndNull) {
330  // Attention: Splitting a null absl::string_view is different than splitting
331  // an empty absl::string_view even though both string_views are considered
332  // equal. This behavior is likely surprising and undesirable. However, to
333  // maintain backward compatibility, there is a small "hack" in
334  // str_split_internal.h that preserves this behavior. If that behavior is ever
335  // changed/fixed, this test will need to be updated.
336  EXPECT_THAT(absl::StrSplit(absl::string_view(""), '-'), ElementsAre(""));
337  EXPECT_THAT(absl::StrSplit(absl::string_view(), '-'), ElementsAre());
338 }
339 
340 TEST(SplitIterator, EqualityAsEndCondition) {
341  auto splitter = absl::StrSplit("a,b,c", ',');
342  auto it = splitter.begin();
343  auto it2 = it;
344 
345  // Increments it2 twice to point to "c" in the input text.
346  ++it2;
347  ++it2;
348  EXPECT_EQ("c", *it2);
349 
350  // This test uses a non-end SplitIterator as the terminating condition in a
351  // for loop. This relies on SplitIterator equality for non-end SplitIterators
352  // working correctly. At this point it2 points to "c", and we use that as the
353  // "end" condition in this test.
354  std::vector<absl::string_view> v;
355  for (; it != it2; ++it) {
356  v.push_back(*it);
357  }
358  EXPECT_THAT(v, ElementsAre("a", "b"));
359 }
360 
361 //
362 // Tests for Splitter
363 //
364 
365 TEST(Splitter, RangeIterators) {
366  auto splitter = absl::StrSplit("a,b,c", ',');
367  std::vector<absl::string_view> output;
368  for (const absl::string_view p : splitter) {
369  output.push_back(p);
370  }
371  EXPECT_THAT(output, ElementsAre("a", "b", "c"));
372 }
373 
374 // Some template functions for use in testing conversion operators
375 template <typename ContainerType, typename Splitter>
376 void TestConversionOperator(const Splitter& splitter) {
377  ContainerType output = splitter;
378  EXPECT_THAT(output, UnorderedElementsAre("a", "b", "c", "d"));
379 }
380 
381 template <typename MapType, typename Splitter>
382 void TestMapConversionOperator(const Splitter& splitter) {
383  MapType m = splitter;
384  EXPECT_THAT(m, UnorderedElementsAre(Pair("a", "b"), Pair("c", "d")));
385 }
386 
387 template <typename FirstType, typename SecondType, typename Splitter>
388 void TestPairConversionOperator(const Splitter& splitter) {
389  std::pair<FirstType, SecondType> p = splitter;
390  EXPECT_EQ(p, (std::pair<FirstType, SecondType>("a", "b")));
391 }
392 
393 TEST(Splitter, ConversionOperator) {
394  auto splitter = absl::StrSplit("a,b,c,d", ',');
395 
396  TestConversionOperator<std::vector<absl::string_view>>(splitter);
397  TestConversionOperator<std::vector<std::string>>(splitter);
398  TestConversionOperator<std::list<absl::string_view>>(splitter);
399  TestConversionOperator<std::list<std::string>>(splitter);
400  TestConversionOperator<std::deque<absl::string_view>>(splitter);
401  TestConversionOperator<std::deque<std::string>>(splitter);
402  TestConversionOperator<std::set<absl::string_view>>(splitter);
403  TestConversionOperator<std::set<std::string>>(splitter);
404  TestConversionOperator<std::multiset<absl::string_view>>(splitter);
405  TestConversionOperator<std::multiset<std::string>>(splitter);
406  TestConversionOperator<std::unordered_set<std::string>>(splitter);
407 
408  // Tests conversion to map-like objects.
409 
410  TestMapConversionOperator<std::map<absl::string_view, absl::string_view>>(
411  splitter);
412  TestMapConversionOperator<std::map<absl::string_view, std::string>>(splitter);
413  TestMapConversionOperator<std::map<std::string, absl::string_view>>(splitter);
414  TestMapConversionOperator<std::map<std::string, std::string>>(splitter);
415  TestMapConversionOperator<
416  std::multimap<absl::string_view, absl::string_view>>(splitter);
417  TestMapConversionOperator<std::multimap<absl::string_view, std::string>>(
418  splitter);
419  TestMapConversionOperator<std::multimap<std::string, absl::string_view>>(
420  splitter);
421  TestMapConversionOperator<std::multimap<std::string, std::string>>(splitter);
422  TestMapConversionOperator<std::unordered_map<std::string, std::string>>(
423  splitter);
424 
425  // Tests conversion to std::pair
426 
427  TestPairConversionOperator<absl::string_view, absl::string_view>(splitter);
428  TestPairConversionOperator<absl::string_view, std::string>(splitter);
429  TestPairConversionOperator<std::string, absl::string_view>(splitter);
430  TestPairConversionOperator<std::string, std::string>(splitter);
431 }
432 
433 // A few additional tests for conversion to std::pair. This conversion is
434 // different from others because a std::pair always has exactly two elements:
435 // .first and .second. The split has to work even when the split has
436 // less-than, equal-to, and more-than 2 strings.
437 TEST(Splitter, ToPair) {
438  {
439  // Empty std::string
440  std::pair<std::string, std::string> p = absl::StrSplit("", ',');
441  EXPECT_EQ("", p.first);
442  EXPECT_EQ("", p.second);
443  }
444 
445  {
446  // Only first
447  std::pair<std::string, std::string> p = absl::StrSplit("a", ',');
448  EXPECT_EQ("a", p.first);
449  EXPECT_EQ("", p.second);
450  }
451 
452  {
453  // Only second
454  std::pair<std::string, std::string> p = absl::StrSplit(",b", ',');
455  EXPECT_EQ("", p.first);
456  EXPECT_EQ("b", p.second);
457  }
458 
459  {
460  // First and second.
461  std::pair<std::string, std::string> p = absl::StrSplit("a,b", ',');
462  EXPECT_EQ("a", p.first);
463  EXPECT_EQ("b", p.second);
464  }
465 
466  {
467  // First and second and then more stuff that will be ignored.
468  std::pair<std::string, std::string> p = absl::StrSplit("a,b,c", ',');
469  EXPECT_EQ("a", p.first);
470  EXPECT_EQ("b", p.second);
471  // "c" is omitted.
472  }
473 }
474 
475 TEST(Splitter, Predicates) {
476  static const char kTestChars[] = ",a, ,b,";
477  using absl::AllowEmpty;
478  using absl::SkipEmpty;
479  using absl::SkipWhitespace;
480 
481  {
482  // No predicate. Does not skip empties.
483  auto splitter = absl::StrSplit(kTestChars, ',');
484  std::vector<std::string> v = splitter;
485  EXPECT_THAT(v, ElementsAre("", "a", " ", "b", ""));
486  }
487 
488  {
489  // Allows empty strings. Same behavior as no predicate at all.
490  auto splitter = absl::StrSplit(kTestChars, ',', AllowEmpty());
491  std::vector<std::string> v_allowempty = splitter;
492  EXPECT_THAT(v_allowempty, ElementsAre("", "a", " ", "b", ""));
493 
494  // Ensures AllowEmpty equals the behavior with no predicate.
495  auto splitter_nopredicate = absl::StrSplit(kTestChars, ',');
496  std::vector<std::string> v_nopredicate = splitter_nopredicate;
497  EXPECT_EQ(v_allowempty, v_nopredicate);
498  }
499 
500  {
501  // Skips empty strings.
502  auto splitter = absl::StrSplit(kTestChars, ',', SkipEmpty());
503  std::vector<std::string> v = splitter;
504  EXPECT_THAT(v, ElementsAre("a", " ", "b"));
505  }
506 
507  {
508  // Skips empty and all-whitespace strings.
509  auto splitter = absl::StrSplit(kTestChars, ',', SkipWhitespace());
510  std::vector<std::string> v = splitter;
511  EXPECT_THAT(v, ElementsAre("a", "b"));
512  }
513 }
514 
515 //
516 // Tests for StrSplit()
517 //
518 
519 TEST(Split, Basics) {
520  {
521  // Doesn't really do anything useful because the return value is ignored,
522  // but it should work.
523  absl::StrSplit("a,b,c", ',');
524  }
525 
526  {
527  std::vector<absl::string_view> v = absl::StrSplit("a,b,c", ',');
528  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
529  }
530 
531  {
532  std::vector<std::string> v = absl::StrSplit("a,b,c", ',');
533  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
534  }
535 
536  {
537  // Ensures that assignment works. This requires a little extra work with
538  // C++11 because of overloads with initializer_list.
539  std::vector<std::string> v;
540  v = absl::StrSplit("a,b,c", ',');
541 
542  EXPECT_THAT(v, ElementsAre("a", "b", "c"));
543  std::map<std::string, std::string> m;
544  m = absl::StrSplit("a,b,c", ',');
545  EXPECT_EQ(2, m.size());
546  std::unordered_map<std::string, std::string> hm;
547  hm = absl::StrSplit("a,b,c", ',');
548  EXPECT_EQ(2, hm.size());
549  }
550 }
551 
552 absl::string_view ReturnStringView() { return "Hello World"; }
553 const char* ReturnConstCharP() { return "Hello World"; }
554 char* ReturnCharP() { return const_cast<char*>("Hello World"); }
555 
556 TEST(Split, AcceptsCertainTemporaries) {
557  std::vector<std::string> v;
558  v = absl::StrSplit(ReturnStringView(), ' ');
559  EXPECT_THAT(v, ElementsAre("Hello", "World"));
560  v = absl::StrSplit(ReturnConstCharP(), ' ');
561  EXPECT_THAT(v, ElementsAre("Hello", "World"));
562  v = absl::StrSplit(ReturnCharP(), ' ');
563  EXPECT_THAT(v, ElementsAre("Hello", "World"));
564 }
565 
566 TEST(Split, Temporary) {
567  // Use a std::string longer than the SSO length, so that when the temporary is
568  // destroyed, if the splitter keeps a reference to the std::string's contents,
569  // it'll reference freed memory instead of just dead on-stack memory.
570  const char input[] = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u";
571  EXPECT_LT(sizeof(std::string), ABSL_ARRAYSIZE(input))
572  << "Input should be larger than fits on the stack.";
573 
574  // This happens more often in C++11 as part of a range-based for loop.
575  auto splitter = absl::StrSplit(std::string(input), ',');
576  std::string expected = "a";
577  for (absl::string_view letter : splitter) {
578  EXPECT_EQ(expected, letter);
579  ++expected[0];
580  }
581  EXPECT_EQ("v", expected);
582 
583  // This happens more often in C++11 as part of a range-based for loop.
584  auto std_splitter = absl::StrSplit(std::string(input), ',');
585  expected = "a";
586  for (absl::string_view letter : std_splitter) {
587  EXPECT_EQ(expected, letter);
588  ++expected[0];
589  }
590  EXPECT_EQ("v", expected);
591 }
592 
593 template <typename T>
594 static std::unique_ptr<T> CopyToHeap(const T& value) {
595  return std::unique_ptr<T>(new T(value));
596 }
597 
598 TEST(Split, LvalueCaptureIsCopyable) {
599  std::string input = "a,b";
600  auto heap_splitter = CopyToHeap(absl::StrSplit(input, ','));
601  auto stack_splitter = *heap_splitter;
602  heap_splitter.reset();
603  std::vector<std::string> result = stack_splitter;
604  EXPECT_THAT(result, testing::ElementsAre("a", "b"));
605 }
606 
607 TEST(Split, TemporaryCaptureIsCopyable) {
608  auto heap_splitter = CopyToHeap(absl::StrSplit(std::string("a,b"), ','));
609  auto stack_splitter = *heap_splitter;
610  heap_splitter.reset();
611  std::vector<std::string> result = stack_splitter;
612  EXPECT_THAT(result, testing::ElementsAre("a", "b"));
613 }
614 
615 TEST(Split, SplitterIsCopyableAndMoveable) {
616  auto a = absl::StrSplit("foo", '-');
617 
618  // Ensures that the following expressions compile.
619  auto b = a; // Copy construct
620  auto c = std::move(a); // Move construct
621  b = c; // Copy assign
622  c = std::move(b); // Move assign
623 
624  EXPECT_THAT(c, ElementsAre("foo"));
625 }
626 
627 TEST(Split, StringDelimiter) {
628  {
629  std::vector<absl::string_view> v = absl::StrSplit("a,b", ',');
630  EXPECT_THAT(v, ElementsAre("a", "b"));
631  }
632 
633  {
634  std::vector<absl::string_view> v = absl::StrSplit("a,b", std::string(","));
635  EXPECT_THAT(v, ElementsAre("a", "b"));
636  }
637 
638  {
639  std::vector<absl::string_view> v =
640  absl::StrSplit("a,b", absl::string_view(","));
641  EXPECT_THAT(v, ElementsAre("a", "b"));
642  }
643 }
644 
645 #if !defined(__cpp_char8_t)
646 #if defined(__clang__)
647 #pragma clang diagnostic push
648 #pragma clang diagnostic ignored "-Wc++2a-compat"
649 #endif
650 TEST(Split, UTF8) {
651  // Tests splitting utf8 strings and utf8 delimiters.
652  std::string utf8_string = u8"\u03BA\u1F79\u03C3\u03BC\u03B5";
653  {
654  // A utf8 input std::string with an ascii delimiter.
655  std::string to_split = "a," + utf8_string;
656  std::vector<absl::string_view> v = absl::StrSplit(to_split, ',');
657  EXPECT_THAT(v, ElementsAre("a", utf8_string));
658  }
659 
660  {
661  // A utf8 input std::string and a utf8 delimiter.
662  std::string to_split = "a," + utf8_string + ",b";
663  std::string unicode_delimiter = "," + utf8_string + ",";
664  std::vector<absl::string_view> v =
665  absl::StrSplit(to_split, unicode_delimiter);
666  EXPECT_THAT(v, ElementsAre("a", "b"));
667  }
668 
669  {
670  // A utf8 input std::string and ByAnyChar with ascii chars.
671  std::vector<absl::string_view> v =
672  absl::StrSplit(u8"Foo h\u00E4llo th\u4E1Ere", absl::ByAnyChar(" \t"));
673  EXPECT_THAT(v, ElementsAre("Foo", u8"h\u00E4llo", u8"th\u4E1Ere"));
674  }
675 }
676 #if defined(__clang__)
677 #pragma clang diagnostic pop
678 #endif
679 #endif // !defined(__cpp_char8_t)
680 
681 TEST(Split, EmptyStringDelimiter) {
682  {
683  std::vector<std::string> v = absl::StrSplit("", "");
684  EXPECT_THAT(v, ElementsAre(""));
685  }
686 
687  {
688  std::vector<std::string> v = absl::StrSplit("a", "");
689  EXPECT_THAT(v, ElementsAre("a"));
690  }
691 
692  {
693  std::vector<std::string> v = absl::StrSplit("ab", "");
694  EXPECT_THAT(v, ElementsAre("a", "b"));
695  }
696 
697  {
698  std::vector<std::string> v = absl::StrSplit("a b", "");
699  EXPECT_THAT(v, ElementsAre("a", " ", "b"));
700  }
701 }
702 
703 TEST(Split, SubstrDelimiter) {
704  std::vector<absl::string_view> results;
705  absl::string_view delim("//");
706 
707  results = absl::StrSplit("", delim);
708  EXPECT_THAT(results, ElementsAre(""));
709 
710  results = absl::StrSplit("//", delim);
711  EXPECT_THAT(results, ElementsAre("", ""));
712 
713  results = absl::StrSplit("ab", delim);
714  EXPECT_THAT(results, ElementsAre("ab"));
715 
716  results = absl::StrSplit("ab//", delim);
717  EXPECT_THAT(results, ElementsAre("ab", ""));
718 
719  results = absl::StrSplit("ab/", delim);
720  EXPECT_THAT(results, ElementsAre("ab/"));
721 
722  results = absl::StrSplit("a/b", delim);
723  EXPECT_THAT(results, ElementsAre("a/b"));
724 
725  results = absl::StrSplit("a//b", delim);
726  EXPECT_THAT(results, ElementsAre("a", "b"));
727 
728  results = absl::StrSplit("a///b", delim);
729  EXPECT_THAT(results, ElementsAre("a", "/b"));
730 
731  results = absl::StrSplit("a////b", delim);
732  EXPECT_THAT(results, ElementsAre("a", "", "b"));
733 }
734 
735 TEST(Split, EmptyResults) {
736  std::vector<absl::string_view> results;
737 
738  results = absl::StrSplit("", '#');
739  EXPECT_THAT(results, ElementsAre(""));
740 
741  results = absl::StrSplit("#", '#');
742  EXPECT_THAT(results, ElementsAre("", ""));
743 
744  results = absl::StrSplit("#cd", '#');
745  EXPECT_THAT(results, ElementsAre("", "cd"));
746 
747  results = absl::StrSplit("ab#cd#", '#');
748  EXPECT_THAT(results, ElementsAre("ab", "cd", ""));
749 
750  results = absl::StrSplit("ab##cd", '#');
751  EXPECT_THAT(results, ElementsAre("ab", "", "cd"));
752 
753  results = absl::StrSplit("ab##", '#');
754  EXPECT_THAT(results, ElementsAre("ab", "", ""));
755 
756  results = absl::StrSplit("ab#ab#", '#');
757  EXPECT_THAT(results, ElementsAre("ab", "ab", ""));
758 
759  results = absl::StrSplit("aaaa", 'a');
760  EXPECT_THAT(results, ElementsAre("", "", "", "", ""));
761 
762  results = absl::StrSplit("", '#', absl::SkipEmpty());
763  EXPECT_THAT(results, ElementsAre());
764 }
765 
766 template <typename Delimiter>
767 static bool IsFoundAtStartingPos(absl::string_view text, Delimiter d,
768  size_t starting_pos, int expected_pos) {
769  absl::string_view found = d.Find(text, starting_pos);
770  return found.data() != text.data() + text.size() &&
771  expected_pos == found.data() - text.data();
772 }
773 
774 // Helper function for testing Delimiter objects. Returns true if the given
775 // Delimiter is found in the given string at the given position. This function
776 // tests two cases:
777 // 1. The actual text given, staring at position 0
778 // 2. The text given with leading padding that should be ignored
779 template <typename Delimiter>
780 static bool IsFoundAt(absl::string_view text, Delimiter d, int expected_pos) {
781  const std::string leading_text = ",x,y,z,";
782  return IsFoundAtStartingPos(text, d, 0, expected_pos) &&
783  IsFoundAtStartingPos(leading_text + std::string(text), d,
784  leading_text.length(),
785  expected_pos + leading_text.length());
786 }
787 
788 //
789 // Tests for ByString
790 //
791 
792 // Tests using any delimiter that represents a single comma.
793 template <typename Delimiter>
794 void TestComma(Delimiter d) {
795  EXPECT_TRUE(IsFoundAt(",", d, 0));
796  EXPECT_TRUE(IsFoundAt("a,", d, 1));
797  EXPECT_TRUE(IsFoundAt(",b", d, 0));
798  EXPECT_TRUE(IsFoundAt("a,b", d, 1));
799  EXPECT_TRUE(IsFoundAt("a,b,", d, 1));
800  EXPECT_TRUE(IsFoundAt("a,b,c", d, 1));
801  EXPECT_FALSE(IsFoundAt("", d, -1));
802  EXPECT_FALSE(IsFoundAt(" ", d, -1));
803  EXPECT_FALSE(IsFoundAt("a", d, -1));
804  EXPECT_FALSE(IsFoundAt("a b c", d, -1));
805  EXPECT_FALSE(IsFoundAt("a;b;c", d, -1));
806  EXPECT_FALSE(IsFoundAt(";", d, -1));
807 }
808 
809 TEST(Delimiter, ByString) {
810  using absl::ByString;
811  TestComma(ByString(","));
812 
813  // Works as named variable.
814  ByString comma_string(",");
815  TestComma(comma_string);
816 
817  // The first occurrence of empty std::string ("") in a std::string is at position 0.
818  // There is a test below that demonstrates this for absl::string_view::find().
819  // If the ByString delimiter returned position 0 for this, there would
820  // be an infinite loop in the SplitIterator code. To avoid this, empty std::string
821  // is a special case in that it always returns the item at position 1.
822  absl::string_view abc("abc");
823  EXPECT_EQ(0, abc.find("")); // "" is found at position 0
824  ByString empty("");
825  EXPECT_FALSE(IsFoundAt("", empty, 0));
826  EXPECT_FALSE(IsFoundAt("a", empty, 0));
827  EXPECT_TRUE(IsFoundAt("ab", empty, 1));
828  EXPECT_TRUE(IsFoundAt("abc", empty, 1));
829 }
830 
831 TEST(Split, ByChar) {
832  using absl::ByChar;
833  TestComma(ByChar(','));
834 
835  // Works as named variable.
836  ByChar comma_char(',');
837  TestComma(comma_char);
838 }
839 
840 //
841 // Tests for ByAnyChar
842 //
843 
844 TEST(Delimiter, ByAnyChar) {
845  using absl::ByAnyChar;
846  ByAnyChar one_delim(",");
847  // Found
848  EXPECT_TRUE(IsFoundAt(",", one_delim, 0));
849  EXPECT_TRUE(IsFoundAt("a,", one_delim, 1));
850  EXPECT_TRUE(IsFoundAt("a,b", one_delim, 1));
851  EXPECT_TRUE(IsFoundAt(",b", one_delim, 0));
852  // Not found
853  EXPECT_FALSE(IsFoundAt("", one_delim, -1));
854  EXPECT_FALSE(IsFoundAt(" ", one_delim, -1));
855  EXPECT_FALSE(IsFoundAt("a", one_delim, -1));
856  EXPECT_FALSE(IsFoundAt("a;b;c", one_delim, -1));
857  EXPECT_FALSE(IsFoundAt(";", one_delim, -1));
858 
859  ByAnyChar two_delims(",;");
860  // Found
861  EXPECT_TRUE(IsFoundAt(",", two_delims, 0));
862  EXPECT_TRUE(IsFoundAt(";", two_delims, 0));
863  EXPECT_TRUE(IsFoundAt(",;", two_delims, 0));
864  EXPECT_TRUE(IsFoundAt(";,", two_delims, 0));
865  EXPECT_TRUE(IsFoundAt(",;b", two_delims, 0));
866  EXPECT_TRUE(IsFoundAt(";,b", two_delims, 0));
867  EXPECT_TRUE(IsFoundAt("a;,", two_delims, 1));
868  EXPECT_TRUE(IsFoundAt("a,;", two_delims, 1));
869  EXPECT_TRUE(IsFoundAt("a;,b", two_delims, 1));
870  EXPECT_TRUE(IsFoundAt("a,;b", two_delims, 1));
871  // Not found
872  EXPECT_FALSE(IsFoundAt("", two_delims, -1));
873  EXPECT_FALSE(IsFoundAt(" ", two_delims, -1));
874  EXPECT_FALSE(IsFoundAt("a", two_delims, -1));
875  EXPECT_FALSE(IsFoundAt("a=b=c", two_delims, -1));
876  EXPECT_FALSE(IsFoundAt("=", two_delims, -1));
877 
878  // ByAnyChar behaves just like ByString when given a delimiter of empty
879  // std::string. That is, it always returns a zero-length absl::string_view
880  // referring to the item at position 1, not position 0.
881  ByAnyChar empty("");
882  EXPECT_FALSE(IsFoundAt("", empty, 0));
883  EXPECT_FALSE(IsFoundAt("a", empty, 0));
884  EXPECT_TRUE(IsFoundAt("ab", empty, 1));
885  EXPECT_TRUE(IsFoundAt("abc", empty, 1));
886 }
887 
888 //
889 // Tests for ByLength
890 //
891 
892 TEST(Delimiter, ByLength) {
893  using absl::ByLength;
894 
895  ByLength four_char_delim(4);
896 
897  // Found
898  EXPECT_TRUE(IsFoundAt("abcde", four_char_delim, 4));
899  EXPECT_TRUE(IsFoundAt("abcdefghijklmnopqrstuvwxyz", four_char_delim, 4));
900  EXPECT_TRUE(IsFoundAt("a b,c\nd", four_char_delim, 4));
901  // Not found
902  EXPECT_FALSE(IsFoundAt("", four_char_delim, 0));
903  EXPECT_FALSE(IsFoundAt("a", four_char_delim, 0));
904  EXPECT_FALSE(IsFoundAt("ab", four_char_delim, 0));
905  EXPECT_FALSE(IsFoundAt("abc", four_char_delim, 0));
906  EXPECT_FALSE(IsFoundAt("abcd", four_char_delim, 0));
907 }
908 
909 TEST(Split, WorksWithLargeStrings) {
910  if (sizeof(size_t) > 4) {
911  std::string s((uint32_t{1} << 31) + 1, 'x'); // 2G + 1 byte
912  s.back() = '-';
913  std::vector<absl::string_view> v = absl::StrSplit(s, '-');
914  EXPECT_EQ(2, v.size());
915  // The first element will contain 2G of 'x's.
916  // testing::StartsWith is too slow with a 2G std::string.
917  EXPECT_EQ('x', v[0][0]);
918  EXPECT_EQ('x', v[0][1]);
919  EXPECT_EQ('x', v[0][3]);
920  EXPECT_EQ("", v[1]);
921  }
922 }
923 
924 TEST(SplitInternalTest, TypeTraits) {
926  EXPECT_TRUE(
927  (absl::strings_internal::HasMappedType<std::map<int, int>>::value));
929  EXPECT_TRUE(
930  (absl::strings_internal::HasValueType<std::map<int, int>>::value));
932  EXPECT_TRUE(
933  (absl::strings_internal::HasConstIterator<std::map<int, int>>::value));
936  std::initializer_list<int>>::value));
937 }
938 
939 } // namespace
int v
Definition: variant_test.cc:81
strings_internal::MaxSplitsImpl< typename strings_internal::SelectDelimiter< Delimiter >::type > MaxSplits(Delimiter delimiter, int limit)
Definition: str_split.h:292
char * end
constexpr size_type size() const noexcept
Definition: string_view.h:260
strings_internal::Splitter< typename strings_internal::SelectDelimiter< Delimiter >::type, AllowEmpty > StrSplit(strings_internal::ConvertibleToStringView text, Delimiter d)
Definition: str_split.h:491
size_t value
static PerThreadSynch * Skip(PerThreadSynch *x)
Definition: mutex.cc:817
#define ABSL_ARRAYSIZE(array)
Definition: macros.h:42
constexpr const_pointer data() const noexcept
Definition: string_view.h:302
TEST(Symbolize, Unimplemented)
uint64_t b
Definition: layout_test.cc:50
constexpr absl::remove_reference_t< T > && move(T &&t) noexcept
Definition: utility.h:219
const char * in
Definition: parser_test.cc:350


abseil_cpp
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autogenerated on Tue Jun 18 2019 19:44:37