nridge created this revision.
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Herald added a project: clang-tools-extra.

$0 can only be used as a tab stop, not as a placeholder (e.g.
`${0:expression}` is not valid)

Fixes https://github.com/clangd/clangd/issues/1190


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128621

Files:
  clang-tools-extra/clangd/CodeComplete.cpp
  clang-tools-extra/clangd/CodeCompletionStrings.cpp
  clang-tools-extra/clangd/CodeCompletionStrings.h
  clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
  clang-tools-extra/clangd/unittests/CodeCompletionStringsTests.cpp

Index: clang-tools-extra/clangd/unittests/CodeCompletionStringsTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/CodeCompletionStringsTests.cpp
+++ clang-tools-extra/clangd/unittests/CodeCompletionStringsTests.cpp
@@ -23,12 +23,10 @@
         CCTUInfo(Allocator), Builder(*Allocator, CCTUInfo) {}
 
 protected:
-  void computeSignature(const CodeCompletionString &CCS,
-                        bool CompletingPattern = false) {
+  void computeSignature(const CodeCompletionString &CCS) {
     Signature.clear();
     Snippet.clear();
-    getSignature(CCS, &Signature, &Snippet, /*RequiredQualifier=*/nullptr,
-                 CompletingPattern);
+    getSignature(CCS, &Signature, &Snippet, /*RequiredQualifier=*/nullptr);
   }
 
   std::shared_ptr<clang::GlobalCodeCompletionAllocator> Allocator;
@@ -145,12 +143,8 @@
     Builder.AddChunk(CodeCompletionString::CK_SemiColon);
     return *Builder.TakeString();
   };
-  computeSignature(MakeCCS(), /*CompletingPattern=*/false);
+  computeSignature(MakeCCS());
   EXPECT_EQ(Snippet, " ${1:name} = ${2:target};");
-
-  // When completing a pattern, the last placeholder holds the cursor position.
-  computeSignature(MakeCCS(), /*CompletingPattern=*/true);
-  EXPECT_EQ(Snippet, " ${1:name} = ${0:target};");
 }
 
 TEST_F(CompletionStringTest, IgnoreInformativeQualifier) {
Index: clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
+++ clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
@@ -3135,12 +3135,10 @@
     })cpp",
       /*IndexSymbols=*/{}, Options);
 
-  // Last placeholder in code patterns should be $0 to put the cursor there.
   EXPECT_THAT(Results.Completions,
               Contains(AllOf(
                   named("while"),
-                  snippetSuffix(" (${1:condition}) {\n${0:statements}\n}"))));
-  // However, snippets for functions must *not* end with $0.
+                  snippetSuffix(" (${1:condition}) {\n${2:statements}\n}"))));
   EXPECT_THAT(Results.Completions,
               Contains(AllOf(named("while_foo"),
                              snippetSuffix("(${1:int a}, ${2:int b})"))));
Index: clang-tools-extra/clangd/CodeCompletionStrings.h
===================================================================
--- clang-tools-extra/clangd/CodeCompletionStrings.h
+++ clang-tools-extra/clangd/CodeCompletionStrings.h
@@ -41,13 +41,9 @@
 ///   *Snippet = "(${1:size_type})"
 /// If set, RequiredQualifiers is the text that must be typed before the name.
 /// e.g "Base::" when calling a base class member function that's hidden.
-///
-/// When \p CompletingPattern is true, the last placeholder will be of the form
-/// ${0:…}, indicating the cursor should stay there.
 void getSignature(const CodeCompletionString &CCS, std::string *Signature,
                   std::string *Snippet,
-                  std::string *RequiredQualifiers = nullptr,
-                  bool CompletingPattern = false);
+                  std::string *RequiredQualifiers = nullptr);
 
 /// Assembles formatted documentation for a completion result. This includes
 /// documentation comments and other relevant information like annotations.
Index: clang-tools-extra/clangd/CodeCompletionStrings.cpp
===================================================================
--- clang-tools-extra/clangd/CodeCompletionStrings.cpp
+++ clang-tools-extra/clangd/CodeCompletionStrings.cpp
@@ -95,22 +95,7 @@
 }
 
 void getSignature(const CodeCompletionString &CCS, std::string *Signature,
-                  std::string *Snippet, std::string *RequiredQualifiers,
-                  bool CompletingPattern) {
-  // Placeholder with this index will be ${0:…} to mark final cursor position.
-  // Usually we do not add $0, so the cursor is placed at end of completed text.
-  unsigned CursorSnippetArg = std::numeric_limits<unsigned>::max();
-  if (CompletingPattern) {
-    // In patterns, it's best to place the cursor at the last placeholder, to
-    // handle cases like
-    //    namespace ${1:name} {
-    //      ${0:decls}
-    //    }
-    CursorSnippetArg =
-        llvm::count_if(CCS, [](const CodeCompletionString::Chunk &C) {
-          return C.Kind == CodeCompletionString::CK_Placeholder;
-        });
-  }
+                  std::string *Snippet, std::string *RequiredQualifiers) {
   unsigned SnippetArg = 0;
   bool HadObjCArguments = false;
   bool HadInformativeChunks = false;
@@ -192,9 +177,7 @@
     case CodeCompletionString::CK_Placeholder:
       *Signature += Chunk.Text;
       ++SnippetArg;
-      *Snippet +=
-          "${" +
-          std::to_string(SnippetArg == CursorSnippetArg ? 0 : SnippetArg) + ':';
+      *Snippet += "${" + std::to_string(SnippetArg) + ':';
       appendEscapeSnippet(Chunk.Text, Snippet);
       *Snippet += '}';
       break;
Index: clang-tools-extra/clangd/CodeComplete.cpp
===================================================================
--- clang-tools-extra/clangd/CodeComplete.cpp
+++ clang-tools-extra/clangd/CodeComplete.cpp
@@ -399,9 +399,8 @@
     Bundled.emplace_back();
     BundledEntry &S = Bundled.back();
     if (C.SemaResult) {
-      bool IsPattern = C.SemaResult->Kind == CodeCompletionResult::RK_Pattern;
       getSignature(*SemaCCS, &S.Signature, &S.SnippetSuffix,
-                   &Completion.RequiredQualifier, IsPattern);
+                   &Completion.RequiredQualifier);
       S.ReturnType = getReturnType(*SemaCCS);
     } else if (C.IndexResult) {
       S.Signature = std::string(C.IndexResult->Signature);
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