[clang-format] Add a space after a word token only if required (#90161)

Fixes #78166.

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -4834,10 +4834,8 @@ bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
         Right.is(TT_TemplateOpener)) {
       return true;
     }
-    if (Left.is(tok::identifier) && Right.is(tok::numeric_constant) &&
-        Right.TokenText[0] == '.') {
-      return false;
-    }
+    if (Left.Tok.getIdentifierInfo() && Right.is(tok::numeric_constant))
+      return Right.TokenText[0] != '.';
   } else if (Style.isProto()) {
     if (Right.is(tok::period) &&
         Left.isOneOf(Keywords.kw_optional, Keywords.kw_required,
@@ -5266,21 +5264,11 @@ bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
     return true;
   }
   if (Left.is(TT_UnaryOperator)) {
-    if (Right.isNot(tok::l_paren)) {
-      // The alternative operators for ~ and ! are "compl" and "not".
-      // If they are used instead, we do not want to combine them with
-      // the token to the right, unless that is a left paren.
-      if (Left.is(tok::exclaim) && Left.TokenText == "not")
-        return true;
-      if (Left.is(tok::tilde) && Left.TokenText == "compl")
-        return true;
-      // Lambda captures allow for a lone &, so "&]" needs to be properly
-      // handled.
-      if (Left.is(tok::amp) && Right.is(tok::r_square))
-        return Style.SpacesInSquareBrackets;
-    }
-    return (Style.SpaceAfterLogicalNot && Left.is(tok::exclaim)) ||
-           Right.is(TT_BinaryOperator);
+    // Lambda captures allow for a lone &, so "&]" needs to be properly
+    // handled.
+    if (Left.is(tok::amp) && Right.is(tok::r_square))
+      return Style.SpacesInSquareBrackets;
+    return Style.SpaceAfterLogicalNot && Left.is(tok::exclaim);
   }
 
   // If the next token is a binary operator or a selector name, we have

clang/unittests/Format/FormatTest.cpp

@@ -24507,16 +24507,25 @@ TEST_F(FormatTest, AlternativeOperators) {
   verifyFormat("int a compl(5);");
   verifyFormat("int a not(5);");
 
-  /* FIXME handle alternate tokens
-   * https://en.cppreference.com/w/cpp/language/operator_alternative
-  // alternative tokens
-  verifyFormat("compl foo();");     //  ~foo();
-  verifyFormat("foo() <%%>;");      // foo();
-  verifyFormat("void foo() <%%>;"); // void foo(){}
-  verifyFormat("int a <:1:>;");     // int a[1];[
+  verifyFormat("compl foo();");     // ~foo();
+  verifyFormat("foo() <%%>");       // foo() {}
+  verifyFormat("void foo() <%%>");  // void foo() {}
+  verifyFormat("int a<:1:>;");      // int a[1];
   verifyFormat("%:define ABC abc"); // #define ABC abc
   verifyFormat("%:%:");             // ##
-  */
+
+  verifyFormat("a = v(not;);\n"
+               "b = v(not+);\n"
+               "c = v(not x);\n"
+               "d = v(not 1);\n"
+               "e = v(not 123.f);");
+
+  verifyNoChange("#define ASSEMBLER_INSTRUCTION_LIST(V)  \\\n"
+                 "  V(and)                               \\\n"
+                 "  V(not)                               \\\n"
+                 "  V(not!)                              \\\n"
+                 "  V(other)",
+                 getLLVMStyleWithColumns(40));
 }
 
 TEST_F(FormatTest, STLWhileNotDefineChed) {