clang-tools  14.0.0git
FuzzyMatchTests.cpp
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1 //===-- FuzzyMatchTests.cpp - String fuzzy matcher tests --------*- C++ -*-===//
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 "FuzzyMatch.h"
10 
11 #include "llvm/ADT/StringExtras.h"
12 #include "gmock/gmock.h"
13 #include "gtest/gtest.h"
14 
15 namespace clang {
16 namespace clangd {
17 namespace {
18 using ::testing::Not;
19 
20 struct ExpectedMatch {
21  // Annotations are optional, and will not be asserted if absent.
22  ExpectedMatch(llvm::StringRef Match) : Word(Match), Annotated(Match) {
23  for (char C : "[]")
24  Word.erase(std::remove(Word.begin(), Word.end(), C), Word.end());
25  if (Word.size() == Annotated->size())
26  Annotated = llvm::None;
27  }
28  bool accepts(llvm::StringRef ActualAnnotated) const {
29  return !Annotated || ActualAnnotated == *Annotated;
30  }
31 
32  friend llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
33  const ExpectedMatch &M) {
34  OS << "'" << M.Word;
35  if (M.Annotated)
36  OS << "' as " << *M.Annotated;
37  return OS;
38  }
39 
40  std::string Word;
41 
42 private:
43  llvm::Optional<llvm::StringRef> Annotated;
44 };
45 
46 struct MatchesMatcher : public ::testing::MatcherInterface<llvm::StringRef> {
47  ExpectedMatch Candidate;
48  llvm::Optional<float> Score;
49  MatchesMatcher(ExpectedMatch Candidate, llvm::Optional<float> Score)
50  : Candidate(std::move(Candidate)), Score(Score) {}
51 
52  void DescribeTo(::std::ostream *OS) const override {
53  llvm::raw_os_ostream(*OS) << "Matches " << Candidate;
54  if (Score)
55  *OS << " with score " << *Score;
56  }
57 
58  bool MatchAndExplain(llvm::StringRef Pattern,
59  ::testing::MatchResultListener *L) const override {
60  std::unique_ptr<llvm::raw_ostream> OS(
61  L->stream()
62  ? (llvm::raw_ostream *)(new llvm::raw_os_ostream(*L->stream()))
63  : new llvm::raw_null_ostream());
64  FuzzyMatcher Matcher(Pattern);
65  auto Result = Matcher.match(Candidate.Word);
66  auto AnnotatedMatch = Matcher.dumpLast(*OS << "\n");
67  return Result && Candidate.accepts(AnnotatedMatch) &&
68  (!Score || ::testing::Value(*Result, ::testing::FloatEq(*Score)));
69  }
70 };
71 
72 // Accepts patterns that match a given word, optionally requiring a score.
73 // Dumps the debug tables on match failure.
74 ::testing::Matcher<llvm::StringRef> matches(llvm::StringRef M,
75  llvm::Optional<float> Score = {}) {
76  return ::testing::MakeMatcher<llvm::StringRef>(new MatchesMatcher(M, Score));
77 }
78 
79 TEST(FuzzyMatch, Matches) {
80  EXPECT_THAT("", matches("unique_ptr"));
81  EXPECT_THAT("u_p", matches("[u]nique[_p]tr"));
82  EXPECT_THAT("up", matches("[u]nique_[p]tr"));
83  EXPECT_THAT("uq", Not(matches("unique_ptr")));
84  EXPECT_THAT("qp", Not(matches("unique_ptr")));
85  EXPECT_THAT("log", Not(matches("SVGFEMorphologyElement")));
86 
87  EXPECT_THAT("tit", matches("win.[tit]"));
88  EXPECT_THAT("title", matches("win.[title]"));
89  EXPECT_THAT("WordCla", matches("[Word]Character[Cla]ssifier"));
90  EXPECT_THAT("WordCCla", matches("[WordC]haracter[Cla]ssifier"));
91 
92  EXPECT_THAT("dete", Not(matches("editor.quickSuggestionsDelay")));
93 
94  EXPECT_THAT("highlight", matches("editorHover[Highlight]"));
95  EXPECT_THAT("hhighlight", matches("editor[H]over[Highlight]"));
96  EXPECT_THAT("dhhighlight", Not(matches("editorHoverHighlight")));
97 
98  EXPECT_THAT("-moz", matches("[-moz]-foo"));
99  EXPECT_THAT("moz", matches("-[moz]-foo"));
100  EXPECT_THAT("moza", matches("-[moz]-[a]nimation"));
101 
102  EXPECT_THAT("ab", matches("[ab]A"));
103  EXPECT_THAT("ccm", Not(matches("cacmelCase")));
104  EXPECT_THAT("bti", Not(matches("the_black_knight")));
105  EXPECT_THAT("ccm", Not(matches("camelCase")));
106  EXPECT_THAT("cmcm", Not(matches("camelCase")));
107  EXPECT_THAT("BK", matches("the_[b]lack_[k]night"));
108  EXPECT_THAT("KeyboardLayout=", Not(matches("KeyboardLayout")));
109  EXPECT_THAT("LLL", matches("SVisual[L]ogger[L]ogs[L]ist"));
110  EXPECT_THAT("LLLL", Not(matches("SVilLoLosLi")));
111  EXPECT_THAT("LLLL", Not(matches("SVisualLoggerLogsList")));
112  EXPECT_THAT("TEdit", matches("[T]ext[Edit]"));
113  EXPECT_THAT("TEdit", matches("[T]ext[Edit]or"));
114  EXPECT_THAT("TEdit", Not(matches("[T]ext[edit]")));
115  EXPECT_THAT("TEdit", matches("[t]ext_[edit]"));
116  EXPECT_THAT("TEditDt", matches("[T]ext[Edit]or[D]ecoration[T]ype"));
117  EXPECT_THAT("TEdit", matches("[T]ext[Edit]orDecorationType"));
118  EXPECT_THAT("Tedit", matches("[T]ext[Edit]"));
119  EXPECT_THAT("ba", Not(matches("?AB?")));
120  EXPECT_THAT("bkn", matches("the_[b]lack_[kn]ight"));
121  EXPECT_THAT("bt", Not(matches("the_[b]lack_knigh[t]")));
122  EXPECT_THAT("ccm", Not(matches("[c]amelCase[cm]")));
123  EXPECT_THAT("fdm", Not(matches("[f]in[dM]odel")));
124  EXPECT_THAT("fob", Not(matches("[fo]o[b]ar")));
125  EXPECT_THAT("fobz", Not(matches("foobar")));
126  EXPECT_THAT("foobar", matches("[foobar]"));
127  EXPECT_THAT("form", matches("editor.[form]atOnSave"));
128  EXPECT_THAT("g p", matches("[G]it:[ P]ull"));
129  EXPECT_THAT("g p", matches("[G]it:[ P]ull"));
130  EXPECT_THAT("gip", matches("[Gi]t: [P]ull"));
131  EXPECT_THAT("gip", matches("[Gi]t: [P]ull"));
132  EXPECT_THAT("gp", matches("[G]it: [P]ull"));
133  EXPECT_THAT("gp", matches("[G]it_Git_[P]ull"));
134  EXPECT_THAT("is", matches("[I]mport[S]tatement"));
135  EXPECT_THAT("is", matches("[is]Valid"));
136  EXPECT_THAT("lowrd", Not(matches("[low]Wo[rd]")));
137  EXPECT_THAT("myvable", Not(matches("[myva]ria[ble]")));
138  EXPECT_THAT("no", Not(matches("")));
139  EXPECT_THAT("no", Not(matches("match")));
140  EXPECT_THAT("ob", Not(matches("foobar")));
141  EXPECT_THAT("sl", matches("[S]Visual[L]oggerLogsList"));
142  EXPECT_THAT("sllll", matches("[S]Visua[L]ogger[Ll]ama[L]ist"));
143  EXPECT_THAT("THRE", matches("H[T]ML[HRE]lement"));
144  EXPECT_THAT("b", Not(matches("NDEBUG")));
145  EXPECT_THAT("Three", matches("[Three]"));
146  EXPECT_THAT("fo", Not(matches("barfoo")));
147  EXPECT_THAT("fo", matches("bar_[fo]o"));
148  EXPECT_THAT("fo", matches("bar_[Fo]o"));
149  EXPECT_THAT("fo", matches("bar [fo]o"));
150  EXPECT_THAT("fo", matches("bar.[fo]o"));
151  EXPECT_THAT("fo", matches("bar/[fo]o"));
152  EXPECT_THAT("fo", matches("bar\\[fo]o"));
153 
154  EXPECT_THAT(
155  "aaaaaa",
156  matches("[aaaaaa]aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
157  "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"));
158  EXPECT_THAT("baba", Not(matches("ababababab")));
159  EXPECT_THAT("fsfsfs", Not(matches("dsafdsafdsafdsafdsafdsafdsafasdfdsa")));
160  EXPECT_THAT("fsfsfsfsfsfsfsf",
161  Not(matches("dsafdsafdsafdsafdsafdsafdsafasdfdsafdsafdsafdsafdsfd"
162  "safdsfdfdfasdnfdsajfndsjnafjndsajlknfdsa")));
163 
164  EXPECT_THAT(" g", matches("[ g]roup"));
165  EXPECT_THAT("g", matches(" [g]roup"));
166  EXPECT_THAT("g g", Not(matches(" groupGroup")));
167  EXPECT_THAT("g g", matches(" [g]roup[ G]roup"));
168  EXPECT_THAT(" g g", matches("[ ] [g]roup[ G]roup"));
169  EXPECT_THAT("zz", matches("[zz]Group"));
170  EXPECT_THAT("zzg", matches("[zzG]roup"));
171  EXPECT_THAT("g", matches("zz[G]roup"));
172 
173  EXPECT_THAT("aaaa", matches("_a_[aaaa]")); // Prefer consecutive.
174  // These would ideally match, but would need special segmentation rules.
175  EXPECT_THAT("printf", Not(matches("s[printf]")));
176  EXPECT_THAT("str", Not(matches("o[str]eam")));
177  EXPECT_THAT("strcpy", Not(matches("strncpy")));
178  EXPECT_THAT("std", Not(matches("PTHREAD_MUTEX_STALLED")));
179  EXPECT_THAT("std", Not(matches("pthread_condattr_setpshared")));
180 }
181 
182 struct RankMatcher : public ::testing::MatcherInterface<llvm::StringRef> {
183  std::vector<ExpectedMatch> RankedStrings;
184  RankMatcher(std::initializer_list<ExpectedMatch> RankedStrings)
186 
187  void DescribeTo(::std::ostream *OS) const override {
188  llvm::raw_os_ostream O(*OS);
189  O << "Ranks strings in order: [";
190  for (const auto &Str : RankedStrings)
191  O << "\n\t" << Str;
192  O << "\n]";
193  }
194 
195  bool MatchAndExplain(llvm::StringRef Pattern,
196  ::testing::MatchResultListener *L) const override {
197  std::unique_ptr<llvm::raw_ostream> OS(
198  L->stream()
199  ? (llvm::raw_ostream *)(new llvm::raw_os_ostream(*L->stream()))
200  : new llvm::raw_null_ostream());
201  FuzzyMatcher Matcher(Pattern);
202  const ExpectedMatch *LastMatch;
203  llvm::Optional<float> LastScore;
204  bool Ok = true;
205  for (const auto &Str : RankedStrings) {
206  auto Score = Matcher.match(Str.Word);
207  if (!Score) {
208  *OS << "\nDoesn't match '" << Str.Word << "'";
209  Matcher.dumpLast(*OS << "\n");
210  Ok = false;
211  } else {
212  std::string Buf;
213  llvm::raw_string_ostream Info(Buf);
214  auto AnnotatedMatch = Matcher.dumpLast(Info);
215 
216  if (!Str.accepts(AnnotatedMatch)) {
217  *OS << "\nDoesn't match " << Str << ", but " << AnnotatedMatch << "\n"
218  << Info.str();
219  Ok = false;
220  } else if (LastScore && *LastScore < *Score) {
221  *OS << "\nRanks '" << Str.Word << "'=" << *Score << " above '"
222  << LastMatch->Word << "'=" << *LastScore << "\n"
223  << Info.str();
224  Matcher.match(LastMatch->Word);
225  Matcher.dumpLast(*OS << "\n");
226  Ok = false;
227  }
228  }
229  LastMatch = &Str;
230  LastScore = Score;
231  }
232  return Ok;
233  }
234 };
235 
236 // Accepts patterns that match all the strings and rank them in the given order.
237 // Dumps the debug tables on match failure.
238 template <typename... T>
239 ::testing::Matcher<llvm::StringRef> ranks(T... RankedStrings) {
240  return ::testing::MakeMatcher<llvm::StringRef>(
241  new RankMatcher{ExpectedMatch(RankedStrings)...});
242 }
243 
244 TEST(FuzzyMatch, Ranking) {
245  EXPECT_THAT("cons",
246  ranks("[cons]ole", "[Cons]ole", "ArrayBuffer[Cons]tructor"));
247  EXPECT_THAT("foo", ranks("[foo]", "[Foo]"));
248  EXPECT_THAT("onMes",
249  ranks("[onMes]sage", "[onmes]sage", "[on]This[M]ega[Es]capes"));
250  EXPECT_THAT("onmes",
251  ranks("[onmes]sage", "[onMes]sage", "[on]This[M]ega[Es]capes"));
252  EXPECT_THAT("CC", ranks("[C]amel[C]ase", "[c]amel[C]ase"));
253  EXPECT_THAT("cC", ranks("[c]amel[C]ase", "[C]amel[C]ase"));
254  EXPECT_THAT("p", ranks("[p]", "[p]arse", "[p]osix", "[p]afdsa", "[p]ath"));
255  EXPECT_THAT("pa", ranks("[pa]rse", "[pa]th", "[pa]fdsa"));
256  EXPECT_THAT("log", ranks("[log]", "Scroll[Log]icalPosition"));
257  EXPECT_THAT("e", ranks("[e]lse", "Abstract[E]lement"));
258  EXPECT_THAT("workbench.sideb",
259  ranks("[workbench.sideB]ar.location",
260  "[workbench.]editor.default[SideB]ySideLayout"));
261  EXPECT_THAT("editor.r", ranks("[editor.r]enderControlCharacter",
262  "[editor.]overview[R]ulerlanes",
263  "diff[Editor.r]enderSideBySide"));
264  EXPECT_THAT("-mo", ranks("[-mo]z-columns", "[-]ms-ime-[mo]de"));
265  EXPECT_THAT("convertModelPosition",
266  ranks("[convertModelPosition]ToViewPosition",
267  "[convert]ViewTo[ModelPosition]"));
268  EXPECT_THAT("is", ranks("[is]ValidViewletId", "[i]mport [s]tatement"));
269  EXPECT_THAT("strcpy", ranks("[strcpy]", "[strcpy]_s"));
270 }
271 
272 // Verify some bounds so we know scores fall in the right range.
273 // Testing exact scores is fragile, so we prefer Ranking tests.
274 TEST(FuzzyMatch, Scoring) {
275  EXPECT_THAT("abs", matches("[a]w[B]xYz[S]", 7.f / 12.f));
276  EXPECT_THAT("abs", matches("[abs]l", 1.f));
277  EXPECT_THAT("abs", matches("[abs]", 2.f));
278  EXPECT_THAT("Abs", matches("[abs]", 2.f));
279 }
280 
281 TEST(FuzzyMatch, InitialismAndPrefix) {
282  // We want these scores to be roughly the same.
283  EXPECT_THAT("up", matches("[u]nique_[p]tr", 3.f / 4.f));
284  EXPECT_THAT("up", matches("[up]per_bound", 1.f));
285 }
286 
287 // Returns pretty-printed segmentation of Text.
288 // e.g. std::basic_string --> +-- +---- +-----
289 std::string segment(llvm::StringRef Text) {
290  std::vector<CharRole> Roles(Text.size());
291  calculateRoles(Text, Roles);
292  std::string Printed;
293  for (unsigned I = 0; I < Text.size(); ++I)
294  Printed.push_back("?-+ "[static_cast<unsigned>(Roles[I])]);
295  return Printed;
296 }
297 
298 // this is a no-op hack so clang-format will vertically align our testcases.
299 std::string returns(llvm::StringRef Text) { return std::string(Text); }
300 
301 TEST(FuzzyMatch, Segmentation) {
302  EXPECT_THAT(segment("std::basic_string"), //
303  returns("+-- +---- +-----"));
304  EXPECT_THAT(segment("XMLHttpRequest"), //
305  returns("+--+---+------"));
306  EXPECT_THAT(segment("t3h PeNgU1N oF d00m!!!!!!!!"), //
307  returns("+-- +-+-+-+ ++ +--- "));
308 }
309 
310 } // namespace
311 } // namespace clangd
312 } // namespace clang
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