[clangd] Get rid of QueryScopes.empty() == AnyScope special case.

[sammccall]

Yay, thanks!

clangd/index/Index.h

462–463

(while here - is this fixme also addressed?)

[ioeric]

• Remove addressed FIXME.

[ioeric]

• rebase

clangd/FindSymbols.cpp

getWorkspaceSymbols(StringRef Query, int Limit, const SymbolIndex *const Index,
   Req.Query = Names.second;
 
   // FuzzyFind doesn't want leading :: qualifier
   bool IsGlobalQuery = Names.first.consume_front("::");
   // Restrict results to the scope in the query string if present (global or
   // not).
   if (IsGlobalQuery || !Names.first.empty())
     Req.Scopes = {Names.first};
+  else
+    Req.AnyScope = true;
   if (Limit)
     Req.Limit = Limit;
   TopN<ScoredSymbolInfo, ScoredSymbolGreater> Top(
       Req.Limit ? *Req.Limit : std::numeric_limits<size_t>::max());
   FuzzyMatcher Filter(Req.Query);
   Index->fuzzyFind(Req, [HintPath, &Top, &Filter](const Symbol &Sym) {
     // Prefer the definition over e.g. a function declaration in a header
     auto &CD = Sym.Definition ? Sym.Definition : Sym.CanonicalDeclaration;

clangd/index/Index.h

struct FuzzyFindRequest {
   /// \brief A query string for the fuzzy find. This is matched against symbols'
   /// un-qualified identifiers and should not contain qualifiers like "::".
   std::string Query;
   /// \brief If this is non-empty, symbols must be in at least one of the scopes
   /// (e.g. namespaces) excluding nested scopes. For example, if a scope "xyz::"
   /// is provided, the matched symbols must be defined in namespace xyz but not
   /// namespace xyz::abc.
   ///
   /// The global scope is "", a top level scope is "foo::", etc.
-  /// FIXME: drop the special case for empty list, which is the same as
-  /// `AnyScope = true`.
-  /// FIXME: support scope proximity.
   std::vector<std::string> Scopes;
   /// If set to true, allow symbols from any scope. Scopes explicitly listed
   /// above will be ranked higher.
   bool AnyScope = false;
   /// \brief The number of top candidates to return. The index may choose to
   /// return more than this, e.g. if it doesn't know which candidates are best.
   llvm::Optional<uint32_t> Limit;
   /// If set to true, only symbols for completion support will be considered.
   bool RestrictForCodeCompletion = false;

clangd/index/MemIndex.cpp

bool MemIndex::fuzzyFind(const FuzzyFindRequest &Req,
   TopN<std::pair<float, const Symbol *>> Top(
       Req.Limit ? *Req.Limit : std::numeric_limits<size_t>::max());
   FuzzyMatcher Filter(Req.Query);
   bool More = false;
   for (const auto Pair : Index) {
     const Symbol *Sym = Pair.second;
 
     // Exact match against all possible scopes.
-    if (!Req.AnyScope && !Req.Scopes.empty() &&
-        !is_contained(Req.Scopes, Sym->Scope))
+    if (!Req.AnyScope && !is_contained(Req.Scopes, Sym->Scope))
       continue;
     if (Req.RestrictForCodeCompletion &&
         !(Sym->Flags & Symbol::IndexedForCodeCompletion))
       continue;
 
     if (auto Score = Filter.match(Sym->Name))
       if (Top.push({*Score * quality(*Sym), Sym}))
         More = true; // An element with smallest score was discarded.

clangd/index/dex/Dex.cpp

bool Dex::fuzzyFind(const FuzzyFindRequest &Req,
   for (const auto &Trigram : TrigramTokens)
     TrigramIterators.push_back(iterator(Trigram));
   Criteria.push_back(Corpus.intersect(move(TrigramIterators)));
 
   // Generate scope tokens for search query.
   std::vector<std::unique_ptr<Iterator>> ScopeIterators;
   for (const auto &Scope : Req.Scopes)
     ScopeIterators.push_back(iterator(Token(Token::Kind::Scope, Scope)));
-  if (Req.AnyScope || /*legacy*/ Req.Scopes.empty())
+  if (Req.AnyScope)
     ScopeIterators.push_back(
         Corpus.boost(Corpus.all(), ScopeIterators.empty() ? 1.0 : 0.2));
   Criteria.push_back(Corpus.unionOf(move(ScopeIterators)));
 
   // Add proximity paths boosting (all symbols, some boosted).
   Criteria.push_back(createFileProximityIterator(Req.ProximityPaths, URISchemes,
                                                  InvertedIndex, Corpus));
 

unittests/clangd/DexTests.cpp

TEST(Dex, FuzzyFind) {
   EXPECT_THAT(match(*Index, Req),
               UnorderedElementsAre("ns::ABC", "ns::nested::ABC"));
   Req.Query = "A";
   Req.Scopes = {"other::"};
   EXPECT_THAT(match(*Index, Req),
               UnorderedElementsAre("other::A", "other::ABC"));
   Req.Query = "";
   Req.Scopes = {};
+  Req.AnyScope = true;
   EXPECT_THAT(match(*Index, Req),
               UnorderedElementsAre("ns::ABC", "ns::BCD", "::ABC",
                                    "ns::nested::ABC", "other::ABC",
                                    "other::A"));
 }
 
 TEST(DexTest, DexLimitedNumMatches) {
   auto I = Dex::build(generateNumSymbols(0, 100), RefSlab(), URISchemes);
   FuzzyFindRequest Req;
   Req.Query = "5";
+  Req.AnyScope = true;
   Req.Limit = 3;
   bool Incomplete;
   auto Matches = match(*I, Req, &Incomplete);
   EXPECT_TRUE(Req.Limit);
   EXPECT_EQ(Matches.size(), *Req.Limit);
   EXPECT_TRUE(Incomplete);
 }
 
 TEST(DexTest, FuzzyMatch) {
   auto I = Dex::build(
       generateSymbols({"LaughingOutLoud", "LionPopulation", "LittleOldLady"}),
       RefSlab(), URISchemes);
   FuzzyFindRequest Req;
   Req.Query = "lol";
+  Req.AnyScope = true;
   Req.Limit = 2;
   EXPECT_THAT(match(*I, Req),
               UnorderedElementsAre("LaughingOutLoud", "LittleOldLady"));
 }
 
 TEST(DexTest, ShortQuery) {
   auto I =
       Dex::build(generateSymbols({"OneTwoThreeFour"}), RefSlab(), URISchemes);
   FuzzyFindRequest Req;
+  Req.AnyScope = true;
   bool Incomplete;
 
   EXPECT_THAT(match(*I, Req, &Incomplete), ElementsAre("OneTwoThreeFour"));
   EXPECT_FALSE(Incomplete) << "Empty string is not a short query";
 
   Req.Query = "t";
   EXPECT_THAT(match(*I, Req, &Incomplete), ElementsAre());
   EXPECT_TRUE(Incomplete) << "Short queries have different semantics";
 
   Req.Query = "tt";
   EXPECT_THAT(match(*I, Req, &Incomplete), ElementsAre());
   EXPECT_TRUE(Incomplete) << "Short queries have different semantics";
 
   Req.Query = "ttf";
   EXPECT_THAT(match(*I, Req, &Incomplete), ElementsAre("OneTwoThreeFour"));
   EXPECT_FALSE(Incomplete) << "3-char string is not a short query";
 }
 
 TEST(DexTest, MatchQualifiedNamesWithoutSpecificScope) {
   auto I = Dex::build(generateSymbols({"a::y1", "b::y2", "y3"}), RefSlab(),
                       URISchemes);
   FuzzyFindRequest Req;
+  Req.AnyScope = true;
   Req.Query = "y";
   EXPECT_THAT(match(*I, Req), UnorderedElementsAre("a::y1", "b::y2", "y3"));
 }
 
 TEST(DexTest, MatchQualifiedNamesWithGlobalScope) {
   auto I = Dex::build(generateSymbols({"a::y1", "b::y2", "y3"}), RefSlab(),
                       URISchemes);
   FuzzyFindRequest Req;
TEST(DexTest, NoMatchNestedScopes) {
   Req.Scopes = {"a::"};
   EXPECT_THAT(match(*I, Req), UnorderedElementsAre("a::y1"));
 }
 
 TEST(DexTest, WildcardScope) {
   auto I =
       Dex::build(generateSymbols({"a::y1", "a::b::y2", "c::y3"}), RefSlab(), URISchemes);
   FuzzyFindRequest Req;
+  Req.AnyScope = true;
   Req.Query = "y";
   Req.Scopes = {"a::"};
-  Req.AnyScope = true;
   EXPECT_THAT(match(*I, Req),
               UnorderedElementsAre("a::y1", "a::b::y2", "c::y3"));
 }
 
 TEST(DexTest, IgnoreCases) {
   auto I = Dex::build(generateSymbols({"ns::ABC", "ns::abc"}), RefSlab(), URISchemes);
   FuzzyFindRequest Req;
   Req.Query = "AB";

 TEST(DexTest, SymbolIndexOptionsFilter) {
   auto CodeCompletionSymbol = symbol("Completion");
   auto NonCodeCompletionSymbol = symbol("NoCompletion");
   CodeCompletionSymbol.Flags = Symbol::SymbolFlag::IndexedForCodeCompletion;
   NonCodeCompletionSymbol.Flags = Symbol::SymbolFlag::None;
   std::vector<Symbol> Symbols{CodeCompletionSymbol, NonCodeCompletionSymbol};
   Dex I(Symbols, RefSlab(), URISchemes);
   FuzzyFindRequest Req;
+  Req.AnyScope = true;
   Req.RestrictForCodeCompletion = false;
   EXPECT_THAT(match(I, Req), ElementsAre("Completion", "NoCompletion"));
   Req.RestrictForCodeCompletion = true;
   EXPECT_THAT(match(I, Req), ElementsAre("Completion"));
 }
 
 TEST(DexTest, ProximityPathsBoosting) {
   auto RootSymbol = symbol("root::abc");
   RootSymbol.CanonicalDeclaration.FileURI = "unittest:///file.h";
   auto CloseSymbol = symbol("close::abc");
   CloseSymbol.CanonicalDeclaration.FileURI = "unittest:///a/b/c/d/e/f/file.h";
 
   std::vector<Symbol> Symbols{CloseSymbol, RootSymbol};
   Dex I(Symbols, RefSlab(), URISchemes);
 
   FuzzyFindRequest Req;
+  Req.AnyScope = true;
   Req.Query = "abc";
   // The best candidate can change depending on the proximity paths.
   Req.Limit = 1;
 
   // FuzzyFind request comes from the file which is far from the root: expect
   // CloseSymbol to come out.
   Req.ProximityPaths = {testPath("a/b/c/d/e/f/file.h")};
   EXPECT_THAT(match(I, Req), ElementsAre("close::abc"));

unittests/clangd/IndexTests.cpp

TEST(SwapIndexTest, OldIndexRecycled) {
   EXPECT_TRUE(WeakToken.expired());       // So the token is too.
 }
 
 TEST(MemIndexTest, MemIndexDeduplicate) {
   std::vector<Symbol> Symbols = {symbol("1"), symbol("2"), symbol("3"),
                                  symbol("2") /* duplicate */};
   FuzzyFindRequest Req;
   Req.Query = "2";
+  Req.AnyScope = true;
   MemIndex I(Symbols, RefSlab());
   EXPECT_THAT(match(I, Req), ElementsAre("2"));
 }
 
 TEST(MemIndexTest, MemIndexLimitedNumMatches) {
   auto I = MemIndex::build(generateNumSymbols(0, 100), RefSlab());
   FuzzyFindRequest Req;
   Req.Query = "5";
+  Req.AnyScope = true;
   Req.Limit = 3;
   bool Incomplete;
   auto Matches = match(*I, Req, &Incomplete);
   EXPECT_TRUE(Req.Limit);
   EXPECT_EQ(Matches.size(), *Req.Limit);
   EXPECT_TRUE(Incomplete);
 }
 
 TEST(MemIndexTest, FuzzyMatch) {
   auto I = MemIndex::build(
       generateSymbols({"LaughingOutLoud", "LionPopulation", "LittleOldLady"}),
       RefSlab());
   FuzzyFindRequest Req;
   Req.Query = "lol";
+  Req.AnyScope = true;
   Req.Limit = 2;
   EXPECT_THAT(match(*I, Req),
               UnorderedElementsAre("LaughingOutLoud", "LittleOldLady"));
 }
 
 TEST(MemIndexTest, MatchQualifiedNamesWithoutSpecificScope) {
   auto I =
       MemIndex::build(generateSymbols({"a::y1", "b::y2", "y3"}), RefSlab());
   FuzzyFindRequest Req;
   Req.Query = "y";
+  Req.AnyScope = true;
   EXPECT_THAT(match(*I, Req), UnorderedElementsAre("a::y1", "b::y2", "y3"));
 }
 
 TEST(MemIndexTest, MatchQualifiedNamesWithGlobalScope) {
   auto I =
       MemIndex::build(generateSymbols({"a::y1", "b::y2", "y3"}), RefSlab());
   FuzzyFindRequest Req;
   Req.Query = "y";

unittests/clangd/SyncAPI.cpp

runDocumentSymbols(ClangdServer &Server, PathRef File) {
   Optional<Expected<std::vector<SymbolInformation>>> Result;
   Server.documentSymbols(File, capture(Result));
   return std::move(*Result);
 }
 
 SymbolSlab runFuzzyFind(const SymbolIndex &Index, StringRef Query) {
   FuzzyFindRequest Req;
   Req.Query = Query;
+  Req.AnyScope = true;
   return runFuzzyFind(Index, Req);
 }
 
 SymbolSlab runFuzzyFind(const SymbolIndex &Index, const FuzzyFindRequest &Req) {
   SymbolSlab::Builder Builder;
   Index.fuzzyFind(Req, [&](const Symbol &Sym) { Builder.insert(Sym); });
   return std::move(Builder).build();
 }