[PATCH] D88810: [clangd] Add isKeyword function.

[Haojian Wu via Phabricator via cfe-commits]

hokein created this revision.
hokein added a reviewer: sammccall.
Herald added subscribers: usaxena95, kadircet, arphaman.
Herald added a project: clang.
hokein requested review of this revision.
Herald added subscribers: MaskRay, ilya-biryukov.

This will be used in rename for doing basic name validation.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D88810

Files:
  clang-tools-extra/clangd/SourceCode.cpp
  clang-tools-extra/clangd/SourceCode.h
  clang-tools-extra/clangd/unittests/SourceCodeTests.cpp


Index: clang-tools-extra/clangd/unittests/SourceCodeTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/SourceCodeTests.cpp
+++ clang-tools-extra/clangd/unittests/SourceCodeTests.cpp
@@ -789,6 +789,18 @@
   EXPECT_TRUE(isHeaderFile("header.h", LangOpts));
 }
 
+TEST(SourceCodeTests, isKeywords) {
+  LangOptions LangOpts;
+  LangOpts.CPlusPlus11 = true;
+  EXPECT_TRUE(isKeyword("int", LangOpts));
+  EXPECT_TRUE(isKeyword("return", LangOpts));
+
+  // these are identifiers (not keywords!) with special meaning in some
+  // contexts.
+  EXPECT_FALSE(isKeyword("final", LangOpts));
+  EXPECT_FALSE(isKeyword("override", LangOpts));
+}
+
 } // namespace
 } // namespace clangd
 } // namespace clang
Index: clang-tools-extra/clangd/SourceCode.h
===================================================================
--- clang-tools-extra/clangd/SourceCode.h
+++ clang-tools-extra/clangd/SourceCode.h
@@ -248,6 +248,10 @@
                                               const LangOptions &LangOpts);
 };
 
+/// Return true if the \p TokenName is in the list of reversed keywords of the
+/// language.
+bool isKeyword(llvm::StringRef TokenName, const LangOptions &LangOpts);
+
 /// Heuristically determine namespaces visible at a point, without parsing Code.
 /// This considers using-directives and enclosing namespace-declarations that
 /// are visible (and not obfuscated) in the file itself (not headers).
Index: clang-tools-extra/clangd/SourceCode.cpp
===================================================================
--- clang-tools-extra/clangd/SourceCode.cpp
+++ clang-tools-extra/clangd/SourceCode.cpp
@@ -633,6 +633,12 @@
   return Ranges;
 }
 
+bool isKeyword(llvm::StringRef NewName, const LangOptions &LangOpts) {
+  // Keywords are initialized in constructor.
+  clang::IdentifierTable KeywordsTable(LangOpts);
+  return KeywordsTable.find(NewName) != KeywordsTable.end();
+}
+
 namespace {
 struct NamespaceEvent {
   enum {


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