[clang-format] Fix a bug that changes keyword or to an identifier (llvm#128410)

Fixes llvm#105482

Author: owenca

clang/lib/Format/FormatToken.h

@@ -743,29 +743,6 @@ struct FormatToken {
     return isOneOf(tok::star, tok::amp, tok::ampamp);
   }
 
-  bool isCppAlternativeOperatorKeyword() const {
-    assert(!TokenText.empty());
-    if (!isalpha(TokenText[0]))
-      return false;
-
-    switch (Tok.getKind()) {
-    case tok::ampamp:
-    case tok::ampequal:
-    case tok::amp:
-    case tok::pipe:
-    case tok::tilde:
-    case tok::exclaim:
-    case tok::exclaimequal:
-    case tok::pipepipe:
-    case tok::pipeequal:
-    case tok::caret:
-    case tok::caretequal:
-      return true;
-    default:
-      return false;
-    }
-  }
-
   bool isUnaryOperator() const {
     switch (Tok.getKind()) {
     case tok::plus:

clang/lib/Format/UnwrappedLineParser.cpp

@@ -1712,12 +1712,6 @@ void UnwrappedLineParser::parseStructuralElement(
            OpeningBrace && OpeningBrace->isOneOf(TT_RequiresExpressionLBrace,
                                                  TT_CompoundRequirementLBrace);
        !eof();) {
-    if (IsCpp && FormatTok->isCppAlternativeOperatorKeyword()) {
-      if (auto *Next = Tokens->peekNextToken(/*SkipComment=*/true);
-          Next && Next->isBinaryOperator()) {
-        FormatTok->Tok.setKind(tok::identifier);
-      }
-    }
     const FormatToken *Previous = FormatTok->Previous;
     switch (FormatTok->Tok.getKind()) {
     case tok::at:

clang/unittests/Format/FormatTest.cpp

@@ -18075,9 +18075,11 @@ TEST_F(FormatTest, ConfigurableSpaceBeforeAssignmentOperators) {
   verifyFormat("int a = 5;");
   verifyFormat("a += 42;");
   verifyFormat("a or_eq 8;");
-  verifyFormat("xor = foo;");
 
-  FormatStyle Spaces = getLLVMStyle();
+  auto Spaces = getLLVMStyle(FormatStyle::LK_C);
+  verifyFormat("xor = foo;", Spaces);
+
+  Spaces.Language = FormatStyle::LK_Cpp;
   Spaces.SpaceBeforeAssignmentOperators = false;
   verifyFormat("int a= 5;", Spaces);
   verifyFormat("a+= 42;", Spaces);

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -3677,6 +3677,11 @@ TEST_F(TokenAnnotatorTest, CppAltOperatorKeywords) {
   ASSERT_EQ(Tokens.size(), 7u) << Tokens;
   EXPECT_TOKEN(Tokens[3], tok::pipepipe, TT_BinaryOperator);
 
+  Tokens = annotate("return segment < *this or *this < segment;");
+  ASSERT_EQ(Tokens.size(), 12u) << Tokens;
+  EXPECT_TOKEN(Tokens[5], tok::pipepipe, TT_BinaryOperator);
+  EXPECT_TOKEN(Tokens[6], tok::star, TT_UnaryOperator);
+
   Tokens = annotate("a = b or_eq c;");
   ASSERT_EQ(Tokens.size(), 7u) << Tokens;
   EXPECT_TOKEN(Tokens[3], tok::pipeequal, TT_BinaryOperator);
@@ -3689,11 +3694,13 @@ TEST_F(TokenAnnotatorTest, CppAltOperatorKeywords) {
   ASSERT_EQ(Tokens.size(), 7u) << Tokens;
   EXPECT_TOKEN(Tokens[3], tok::caretequal, TT_BinaryOperator);
 
-  Tokens = annotate("xor = foo;");
+  const auto StyleC = getLLVMStyle(FormatStyle::LK_C);
+
+  Tokens = annotate("xor = foo;", StyleC);
   ASSERT_EQ(Tokens.size(), 5u) << Tokens;
   EXPECT_TOKEN(Tokens[0], tok::identifier, TT_Unknown);
 
-  Tokens = annotate("int xor = foo;");
+  Tokens = annotate("int xor = foo;", StyleC);
   ASSERT_EQ(Tokens.size(), 6u) << Tokens;
   EXPECT_TOKEN(Tokens[1], tok::identifier, TT_StartOfName);
 }