[clangd] Use operator<< to prevent printers issues in Gtest

Summary:
It is possible that there will be two different instantiations of
the printer template for a given type and some tests could end up calling the
wrong (default) one. For example, it was seen in CodeCompleteTests.cpp when
printing CompletionItems that it would use the wrong printer because the default
is also instantiated in ClangdTests.cpp.

With this change, objects that were previously printed with a custom Printer now
get printed through the operator<< which is declared alongside the class.
This rule of the thumb should make it less error-prone.

Reviewers: simark, ilya-biryukov, sammccall

Reviewed By: simark, ilya-biryukov, sammccall

Subscribers: bkramer, hokein, sammccall, klimek, ilya-biryukov, jkorous-apple, ioeric, MaskRay, cfe-commits

Differential Revision: https://reviews.llvm.org/D44764

llvm-svn: 329725

clang-tools-extra/clangd/Protocol.cpp

@@ -446,6 +446,11 @@ json::Expr toJSON(const CompletionItem &CI) {
   return std::move(Result);
 }
 
+llvm::raw_ostream &operator<<(llvm::raw_ostream &O, const CompletionItem &I) {
+  O << I.label << " - " << toJSON(I);
+  return O;
+}
+
 bool operator<(const CompletionItem &L, const CompletionItem &R) {
   return (L.sortText.empty() ? L.label : L.sortText) <
          (R.sortText.empty() ? R.label : R.sortText);
@@ -477,6 +482,12 @@ json::Expr toJSON(const SignatureInformation &SI) {
   return std::move(Result);
 }
 
+llvm::raw_ostream &operator<<(llvm::raw_ostream &O,
+                              const SignatureInformation &I) {
+  O << I.label << " - " << toJSON(I);
+  return O;
+}
+
 json::Expr toJSON(const SignatureHelp &SH) {
   assert(SH.activeSignature >= 0 &&
          "Unexpected negative value for number of active signatures.");
@@ -502,6 +513,16 @@ json::Expr toJSON(const DocumentHighlight &DH) {
   };
 }
 
+llvm::raw_ostream &operator<<(llvm::raw_ostream &O,
+                              const DocumentHighlight &V) {
+  O << V.range;
+  if (V.kind == DocumentHighlightKind::Read)
+    O << "(r)";
+  if (V.kind == DocumentHighlightKind::Write)
+    O << "(w)";
+  return O;
+}
+
 bool fromJSON(const json::Expr &Params, DidChangeConfigurationParams &CCP) {
   json::ObjectMapper O(Params);
   return O && O.map("settings", CCP.settings);

clang-tools-extra/clangd/Protocol.h

@@ -670,6 +670,7 @@ struct CompletionItem {
   //              between a completion and a completion resolve request.
 };
 json::Expr toJSON(const CompletionItem &);
+llvm::raw_ostream &operator<<(llvm::raw_ostream &, const CompletionItem &);
 
 bool operator<(const CompletionItem &, const CompletionItem &);
 
@@ -708,6 +709,8 @@ struct SignatureInformation {
   std::vector<ParameterInformation> parameters;
 };
 json::Expr toJSON(const SignatureInformation &);
+llvm::raw_ostream &operator<<(llvm::raw_ostream &,
+                              const SignatureInformation &);
 
 /// Represents the signature of a callable.
 struct SignatureHelp {
@@ -761,6 +764,7 @@ struct DocumentHighlight {
   }
 };
 json::Expr toJSON(const DocumentHighlight &DH);
+llvm::raw_ostream &operator<<(llvm::raw_ostream &, const DocumentHighlight &);
 
 } // namespace clangd
 } // namespace clang

clang-tools-extra/unittests/clangd/CodeCompleteTests.cpp

@@ -22,33 +22,6 @@
 
 namespace clang {
 namespace clangd {
-// Let GMock print completion items and signature help.
-void PrintTo(const CompletionItem &I, std::ostream *O) {
-  llvm::raw_os_ostream OS(*O);
-  OS << I.label << " - " << toJSON(I);
-}
-void PrintTo(const std::vector<CompletionItem> &V, std::ostream *O) {
-  *O << "{\n";
-  for (const auto &I : V) {
-    *O << "\t";
-    PrintTo(I, O);
-    *O << "\n";
-  }
-  *O << "}";
-}
-void PrintTo(const SignatureInformation &I, std::ostream *O) {
-  llvm::raw_os_ostream OS(*O);
-  OS << I.label << " - " << toJSON(I);
-}
-void PrintTo(const std::vector<SignatureInformation> &V, std::ostream *O) {
-  *O << "{\n";
-  for (const auto &I : V) {
-    *O << "\t";
-    PrintTo(I, O);
-    *O << "\n";
-  }
-  *O << "}";
-}
 
 namespace {
 using namespace llvm;

clang-tools-extra/unittests/clangd/JSONExprTests.cpp

@@ -15,9 +15,7 @@
 namespace clang {
 namespace clangd {
 namespace json {
-void PrintTo(const Expr &E, std::ostream *OS) {
-  llvm::raw_os_ostream(*OS) << llvm::formatv("{0:2}", E);
-}
+
 namespace {
 
 std::string s(const Expr &E) { return llvm::formatv("{0}", E).str(); }

clang-tools-extra/unittests/clangd/XRefsTests.cpp

@@ -24,15 +24,6 @@ namespace clang {
 namespace clangd {
 using namespace llvm;
 
-void PrintTo(const DocumentHighlight &V, std::ostream *O) {
-  llvm::raw_os_ostream OS(*O);
-  OS << V.range;
-  if (V.kind == DocumentHighlightKind::Read)
-    OS << "(r)";
-  if (V.kind == DocumentHighlightKind::Write)
-    OS << "(w)";
-}
-
 namespace {
 using testing::ElementsAre;
 using testing::Field;