Improve indentation of assignments.

Before:
unsigned OriginalStartColumn = SourceMgr.getSpellingColumnNumber(
    Current.FormatTok.getStartOfNonWhitespace()) -
                               1;

After:
unsigned OriginalStartColumn =
    SourceMgr.getSpellingColumnNumber(
        Current.FormatTok.getStartOfNonWhitespace()) -
    1;

llvm-svn: 182733

clang/lib/Format/Format.cpp

@@ -640,7 +640,10 @@ private:
       else if ((Previous.Type == TT_BinaryOperator ||
                 Previous.Type == TT_ConditionalExpr ||
                 Previous.Type == TT_CtorInitializerColon) &&
-               getPrecedence(Previous) != prec::Assignment)
+               !(getPrecedence(Previous) == prec::Assignment &&
+                 Current.FakeLParens.empty()))
+        // Always indent relative to the RHS of the expression unless this is a
+        // simple assignment without binary expression on the RHS.
         State.Stack.back().LastSpace = State.Column;
       else if (Previous.Type == TT_InheritanceColon)
         State.Stack.back().Indent = State.Column;

clang/unittests/Format/FormatTest.cpp

@@ -2336,6 +2336,10 @@ TEST_F(FormatTest, BreaksAfterAssignments) {
   verifyFormat(
       "aaaaaaaaaaaaaaaaaaaaaaaaaa aaaa = aaaaaaaaaaaaaa(0).aaaa()\n"
       "    .aaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaa::aaaaaaaaaaaaaaaaaaaaa);");
+  verifyFormat("unsigned OriginalStartColumn =\n"
+               "    SourceMgr.getSpellingColumnNumber(\n"
+               "        Current.FormatTok.getStartOfNonWhitespace()) -\n"
+               "    1;");
 }
 
 TEST_F(FormatTest, AlignsAfterAssignments) {