More precisely recognize ObjC method declarations.

Otherwise, +/- and the beginning of constants can be recognized
incorrectly.

Before:  #define A - 1
After:   #define A -1

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177725 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/TokenAnnotator.cpp

@@ -313,9 +313,11 @@ private:
     switch (Tok->FormatTok.Tok.getKind()) {
     case tok::plus:
     case tok::minus:
-      // At the start of the line, +/- specific ObjectiveC method
-      // declarations.
-      if (Tok->Parent == NULL)
+      // At the start of the line, +/- specify ObjectiveC method declarations.
+      if (Tok->Children.empty() || Tok->Children[0].Children.empty())
+        break; // Can't be an ObjectiveC method declaration.
+      if (Tok->Parent == NULL && (Tok->Children[0].is(tok::l_paren) ||
+                                  Tok->Children[0].Children[0].is(tok::colon)))
         Tok->Type = TT_ObjCMethodSpecifier;
       break;
     case tok::colon:

unittests/Format/FormatTest.cpp

@@ -2067,6 +2067,8 @@ TEST_F(FormatTest, UnderstandsUnaryOperators) {
                "case -1:\n"
                "  break;\n"
                "}");
+  verifyFormat("#define X -1");
+  verifyFormat("#define X -kConstant");
 
   verifyFormat("const NSPoint kBrowserFrameViewPatternOffset = { -5, +3 };");
   verifyFormat("const NSPoint kBrowserFrameViewPatternOffset = { +5, -3 };");