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llvm-project/clang-tools-extra/clangd/unittests/FuzzyMatchTests.cpp

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//===-- FuzzyMatchTests.cpp - String fuzzy matcher tests --------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "FuzzyMatch.h"
#include "llvm/ADT/StringExtras.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
namespace clang {
namespace clangd {
namespace {
using ::testing::Not;
struct ExpectedMatch {
// Annotations are optional, and will not be asserted if absent.
ExpectedMatch(llvm::StringRef Match) : Word(Match), Annotated(Match) {
for (char C : "[]")
Word.erase(std::remove(Word.begin(), Word.end(), C), Word.end());
if (Word.size() == Annotated->size())
Annotated = llvm::None;
}
bool accepts(llvm::StringRef ActualAnnotated) const {
return !Annotated || ActualAnnotated == *Annotated;
}
friend llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
const ExpectedMatch &M) {
OS << "'" << M.Word;
if (M.Annotated)
OS << "' as " << *M.Annotated;
return OS;
}
std::string Word;
private:
llvm::Optional<llvm::StringRef> Annotated;
};
struct MatchesMatcher : public ::testing::MatcherInterface<llvm::StringRef> {
ExpectedMatch Candidate;
llvm::Optional<float> Score;
MatchesMatcher(ExpectedMatch Candidate, llvm::Optional<float> Score)
: Candidate(std::move(Candidate)), Score(Score) {}
void DescribeTo(::std::ostream *OS) const override {
llvm::raw_os_ostream(*OS) << "Matches " << Candidate;
if (Score)
*OS << " with score " << *Score;
}
bool MatchAndExplain(llvm::StringRef Pattern,
::testing::MatchResultListener *L) const override {
std::unique_ptr<llvm::raw_ostream> OS(
L->stream()
? (llvm::raw_ostream *)(new llvm::raw_os_ostream(*L->stream()))
: new llvm::raw_null_ostream());
FuzzyMatcher Matcher(Pattern);
auto Result = Matcher.match(Candidate.Word);
auto AnnotatedMatch = Matcher.dumpLast(*OS << "\n");
return Result && Candidate.accepts(AnnotatedMatch) &&
(!Score || ::testing::Value(*Result, ::testing::FloatEq(*Score)));
}
};
// Accepts patterns that match a given word, optionally requiring a score.
// Dumps the debug tables on match failure.
::testing::Matcher<llvm::StringRef> matches(llvm::StringRef M,
llvm::Optional<float> Score = {}) {
return ::testing::MakeMatcher<llvm::StringRef>(new MatchesMatcher(M, Score));
}
TEST(FuzzyMatch, Matches) {
EXPECT_THAT("", matches("unique_ptr"));
EXPECT_THAT("u_p", matches("[u]nique[_p]tr"));
EXPECT_THAT("up", matches("[u]nique_[p]tr"));
EXPECT_THAT("uq", Not(matches("unique_ptr")));
EXPECT_THAT("qp", Not(matches("unique_ptr")));
EXPECT_THAT("log", Not(matches("SVGFEMorphologyElement")));
EXPECT_THAT("tit", matches("win.[tit]"));
EXPECT_THAT("title", matches("win.[title]"));
EXPECT_THAT("WordCla", matches("[Word]Character[Cla]ssifier"));
EXPECT_THAT("WordCCla", matches("[WordC]haracter[Cla]ssifier"));
EXPECT_THAT("dete", Not(matches("editor.quickSuggestionsDelay")));
EXPECT_THAT("highlight", matches("editorHover[Highlight]"));
EXPECT_THAT("hhighlight", matches("editor[H]over[Highlight]"));
EXPECT_THAT("dhhighlight", Not(matches("editorHoverHighlight")));
EXPECT_THAT("-moz", matches("[-moz]-foo"));
EXPECT_THAT("moz", matches("-[moz]-foo"));
EXPECT_THAT("moza", matches("-[moz]-[a]nimation"));
EXPECT_THAT("ab", matches("[ab]A"));
EXPECT_THAT("ccm", Not(matches("cacmelCase")));
EXPECT_THAT("bti", Not(matches("the_black_knight")));
EXPECT_THAT("ccm", Not(matches("camelCase")));
EXPECT_THAT("cmcm", Not(matches("camelCase")));
EXPECT_THAT("BK", matches("the_[b]lack_[k]night"));
EXPECT_THAT("KeyboardLayout=", Not(matches("KeyboardLayout")));
EXPECT_THAT("LLL", matches("SVisual[L]ogger[L]ogs[L]ist"));
EXPECT_THAT("LLLL", Not(matches("SVilLoLosLi")));
EXPECT_THAT("LLLL", Not(matches("SVisualLoggerLogsList")));
EXPECT_THAT("TEdit", matches("[T]ext[Edit]"));
EXPECT_THAT("TEdit", matches("[T]ext[Edit]or"));
EXPECT_THAT("TEdit", Not(matches("[T]ext[edit]")));
EXPECT_THAT("TEdit", matches("[t]ext_[edit]"));
EXPECT_THAT("TEditDt", matches("[T]ext[Edit]or[D]ecoration[T]ype"));
EXPECT_THAT("TEdit", matches("[T]ext[Edit]orDecorationType"));
EXPECT_THAT("Tedit", matches("[T]ext[Edit]"));
EXPECT_THAT("ba", Not(matches("?AB?")));
EXPECT_THAT("bkn", matches("the_[b]lack_[kn]ight"));
EXPECT_THAT("bt", Not(matches("the_[b]lack_knigh[t]")));
EXPECT_THAT("ccm", Not(matches("[c]amelCase[cm]")));
EXPECT_THAT("fdm", Not(matches("[f]in[dM]odel")));
EXPECT_THAT("fob", Not(matches("[fo]o[b]ar")));
EXPECT_THAT("fobz", Not(matches("foobar")));
EXPECT_THAT("foobar", matches("[foobar]"));
EXPECT_THAT("form", matches("editor.[form]atOnSave"));
EXPECT_THAT("g p", matches("[G]it:[ P]ull"));
EXPECT_THAT("g p", matches("[G]it:[ P]ull"));
EXPECT_THAT("gip", matches("[Gi]t: [P]ull"));
EXPECT_THAT("gip", matches("[Gi]t: [P]ull"));
EXPECT_THAT("gp", matches("[G]it: [P]ull"));
EXPECT_THAT("gp", matches("[G]it_Git_[P]ull"));
EXPECT_THAT("is", matches("[I]mport[S]tatement"));
EXPECT_THAT("is", matches("[is]Valid"));
EXPECT_THAT("lowrd", Not(matches("[low]Wo[rd]")));
EXPECT_THAT("myvable", Not(matches("[myva]ria[ble]")));
EXPECT_THAT("no", Not(matches("")));
EXPECT_THAT("no", Not(matches("match")));
EXPECT_THAT("ob", Not(matches("foobar")));
EXPECT_THAT("sl", matches("[S]Visual[L]oggerLogsList"));
EXPECT_THAT("sllll", matches("[S]Visua[L]ogger[Ll]ama[L]ist"));
EXPECT_THAT("THRE", matches("H[T]ML[HRE]lement"));
EXPECT_THAT("b", Not(matches("NDEBUG")));
EXPECT_THAT("Three", matches("[Three]"));
EXPECT_THAT("fo", Not(matches("barfoo")));
EXPECT_THAT("fo", matches("bar_[fo]o"));
EXPECT_THAT("fo", matches("bar_[Fo]o"));
EXPECT_THAT("fo", matches("bar [fo]o"));
EXPECT_THAT("fo", matches("bar.[fo]o"));
EXPECT_THAT("fo", matches("bar/[fo]o"));
EXPECT_THAT("fo", matches("bar\\[fo]o"));
EXPECT_THAT(
"aaaaaa",
matches("[aaaaaa]aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"));
EXPECT_THAT("baba", Not(matches("ababababab")));
EXPECT_THAT("fsfsfs", Not(matches("dsafdsafdsafdsafdsafdsafdsafasdfdsa")));
EXPECT_THAT("fsfsfsfsfsfsfsf",
Not(matches("dsafdsafdsafdsafdsafdsafdsafasdfdsafdsafdsafdsafdsfd"
"safdsfdfdfasdnfdsajfndsjnafjndsajlknfdsa")));
EXPECT_THAT(" g", matches("[ g]roup"));
EXPECT_THAT("g", matches(" [g]roup"));
EXPECT_THAT("g g", Not(matches(" groupGroup")));
EXPECT_THAT("g g", matches(" [g]roup[ G]roup"));
EXPECT_THAT(" g g", matches("[ ] [g]roup[ G]roup"));
EXPECT_THAT("zz", matches("[zz]Group"));
EXPECT_THAT("zzg", matches("[zzG]roup"));
EXPECT_THAT("g", matches("zz[G]roup"));
EXPECT_THAT("aaaa", matches("_a_[aaaa]")); // Prefer consecutive.
// These would ideally match, but would need special segmentation rules.
EXPECT_THAT("printf", Not(matches("s[printf]")));
EXPECT_THAT("str", Not(matches("o[str]eam")));
EXPECT_THAT("strcpy", Not(matches("strncpy")));
EXPECT_THAT("std", Not(matches("PTHREAD_MUTEX_STALLED")));
EXPECT_THAT("std", Not(matches("pthread_condattr_setpshared")));
}
struct RankMatcher : public ::testing::MatcherInterface<llvm::StringRef> {
std::vector<ExpectedMatch> RankedStrings;
RankMatcher(std::initializer_list<ExpectedMatch> RankedStrings)
: RankedStrings(RankedStrings) {}
void DescribeTo(::std::ostream *OS) const override {
llvm::raw_os_ostream O(*OS);
O << "Ranks strings in order: [";
for (const auto &Str : RankedStrings)
O << "\n\t" << Str;
O << "\n]";
}
bool MatchAndExplain(llvm::StringRef Pattern,
::testing::MatchResultListener *L) const override {
std::unique_ptr<llvm::raw_ostream> OS(
L->stream()
? (llvm::raw_ostream *)(new llvm::raw_os_ostream(*L->stream()))
: new llvm::raw_null_ostream());
FuzzyMatcher Matcher(Pattern);
const ExpectedMatch *LastMatch;
llvm::Optional<float> LastScore;
bool Ok = true;
for (const auto &Str : RankedStrings) {
auto Score = Matcher.match(Str.Word);
if (!Score) {
*OS << "\nDoesn't match '" << Str.Word << "'";
Matcher.dumpLast(*OS << "\n");
Ok = false;
} else {
std::string Buf;
llvm::raw_string_ostream Info(Buf);
auto AnnotatedMatch = Matcher.dumpLast(Info);
if (!Str.accepts(AnnotatedMatch)) {
*OS << "\nDoesn't match " << Str << ", but " << AnnotatedMatch << "\n"
<< Info.str();
Ok = false;
} else if (LastScore && *LastScore < *Score) {
*OS << "\nRanks '" << Str.Word << "'=" << *Score << " above '"
<< LastMatch->Word << "'=" << *LastScore << "\n"
<< Info.str();
Matcher.match(LastMatch->Word);
Matcher.dumpLast(*OS << "\n");
Ok = false;
}
}
LastMatch = &Str;
LastScore = Score;
}
return Ok;
}
};
// Accepts patterns that match all the strings and rank them in the given order.
// Dumps the debug tables on match failure.
template <typename... T>
::testing::Matcher<llvm::StringRef> ranks(T... RankedStrings) {
return ::testing::MakeMatcher<llvm::StringRef>(
new RankMatcher{ExpectedMatch(RankedStrings)...});
}
TEST(FuzzyMatch, Ranking) {
EXPECT_THAT("cons",
ranks("[cons]ole", "[Cons]ole", "ArrayBuffer[Cons]tructor"));
EXPECT_THAT("foo", ranks("[foo]", "[Foo]"));
EXPECT_THAT("onMes",
ranks("[onMes]sage", "[onmes]sage", "[on]This[M]ega[Es]capes"));
EXPECT_THAT("onmes",
ranks("[onmes]sage", "[onMes]sage", "[on]This[M]ega[Es]capes"));
EXPECT_THAT("CC", ranks("[C]amel[C]ase", "[c]amel[C]ase"));
EXPECT_THAT("cC", ranks("[c]amel[C]ase", "[C]amel[C]ase"));
EXPECT_THAT("p", ranks("[p]", "[p]arse", "[p]osix", "[p]afdsa", "[p]ath"));
EXPECT_THAT("pa", ranks("[pa]rse", "[pa]th", "[pa]fdsa"));
EXPECT_THAT("log", ranks("[log]", "Scroll[Log]icalPosition"));
EXPECT_THAT("e", ranks("[e]lse", "Abstract[E]lement"));
EXPECT_THAT("workbench.sideb",
ranks("[workbench.sideB]ar.location",
"[workbench.]editor.default[SideB]ySideLayout"));
EXPECT_THAT("editor.r", ranks("[editor.r]enderControlCharacter",
"[editor.]overview[R]ulerlanes",
"diff[Editor.r]enderSideBySide"));
EXPECT_THAT("-mo", ranks("[-mo]z-columns", "[-]ms-ime-[mo]de"));
EXPECT_THAT("convertModelPosition",
ranks("[convertModelPosition]ToViewPosition",
"[convert]ViewTo[ModelPosition]"));
EXPECT_THAT("is", ranks("[is]ValidViewletId", "[i]mport [s]tatement"));
EXPECT_THAT("strcpy", ranks("[strcpy]", "[strcpy]_s"));
}
// Verify some bounds so we know scores fall in the right range.
// Testing exact scores is fragile, so we prefer Ranking tests.
TEST(FuzzyMatch, Scoring) {
EXPECT_THAT("abs", matches("[a]w[B]xYz[S]", 7.f / 12.f));
EXPECT_THAT("abs", matches("[abs]l", 1.f));
EXPECT_THAT("abs", matches("[abs]", 2.f));
EXPECT_THAT("Abs", matches("[abs]", 2.f));
}
TEST(FuzzyMatch, InitialismAndPrefix) {
// We want these scores to be roughly the same.
EXPECT_THAT("up", matches("[u]nique_[p]tr", 3.f / 4.f));
EXPECT_THAT("up", matches("[up]per_bound", 1.f));
}
// Returns pretty-printed segmentation of Text.
// e.g. std::basic_string --> +-- +---- +-----
std::string segment(llvm::StringRef Text) {
std::vector<CharRole> Roles(Text.size());
calculateRoles(Text, Roles);
std::string Printed;
for (unsigned I = 0; I < Text.size(); ++I)
Printed.push_back("?-+ "[static_cast<unsigned>(Roles[I])]);
return Printed;
}
// this is a no-op hack so clang-format will vertically align our testcases.
llvm::StringRef returns(llvm::StringRef Text) { return Text; }
TEST(FuzzyMatch, Segmentation) {
EXPECT_THAT(segment("std::basic_string"), //
returns("+-- +---- +-----"));
EXPECT_THAT(segment("XMLHttpRequest"), //
returns("+--+---+------"));
EXPECT_THAT(segment("t3h PeNgU1N oF d00m!!!!!!!!"), //
returns("+-- +-+-+-+ ++ +--- "));
}
} // namespace
} // namespace clangd
} // namespace clang
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