Improve indentation of builder type calls.

In builder-type calls, it can be very confusing to just indent
parameters from the start of the line. Instead, indent 4 from the
correct function call.

Before:
aaaaaaaaaaaaaaaaaaa()->aaaaaa(bbbbb)->aaaaaaaaaaaaaaaaaaa( // break
    aaaaaaaaaaaaaa);
aaaaaaaaaaaaaaaaaaaaaaa *aaaaaaaaa = aaaaaa->aaaaaaaaaaaa()->aaaaaaaaaaaaaaaa(
    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)
    ->aaaaaaaaaaaaaaaaa();

After:
aaaaaaaaaaaaaaaaaaa()->aaaaaa(bbbbb)->aaaaaaaaaaaaaaaaaaa( // break
                                        aaaaaaaaaaaaaa);
aaaaaaaaaaaaaaaaaaaaaaa *aaaaaaaaa = aaaaaa->aaaaaaaaaaaa()
    ->aaaaaaaaaaaaaaaa(
        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)
    ->aaaaaaaaaaaaaaaaa();

llvm-svn: 175444

clang/lib/Format/Format.cpp

@@ -549,6 +549,9 @@ private:
         // If this function has multiple parameters, indent nested calls from
         // the start of the first parameter.
         State.Stack.back().LastSpace = State.Column;
+      else if ((Current.is(tok::period) || Current.is(tok::arrow)) &&
+               Line.Type == LT_BuilderTypeCall && State.ParenLevel == 0)
+        State.Stack.back().LastSpace = State.Column;
     }
 
     // If we break after an {, we should also break before the corresponding }.

clang/lib/Format/TokenAnnotator.cpp

@@ -471,8 +471,7 @@ public:
       if (!consumeToken())
         return LT_Invalid;
       if (getPrecedence(*TheToken) > prec::Assignment &&
-          TheToken->Type != TT_TemplateOpener &&
-          TheToken->Type != TT_TemplateCloser)
+          TheToken->Type == TT_BinaryOperator)
         CanBeBuilderTypeStmt = false;
     }
     if (KeywordVirtualFound)

clang/unittests/Format/FormatTest.cpp

@@ -1259,6 +1259,14 @@ TEST_F(FormatTest, FormatsBuilderPattern) {
       "aaaaaaa->aaaaaaa\n"
       "    ->aaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)\n"
       "    ->aaaaaaaa(aaaaaaaaaaaaaaa);");
+  verifyFormat(
+      "aaaaaaaaaaaaaaaaaaa()->aaaaaa(bbbbb)->aaaaaaaaaaaaaaaaaaa( // break\n"
+      "                                        aaaaaaaaaaaaaa);");
+  verifyFormat(
+      "aaaaaaaaaaaaaaaaaaaaaaa *aaaaaaaaa = aaaaaa->aaaaaaaaaaaa()\n"
+      "    ->aaaaaaaaaaaaaaaa(\n"
+      "        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)\n"
+      "    ->aaaaaaaaaaaaaaaaa();");
 }
 
 TEST_F(FormatTest, DoesNotBreakTrailingAnnotation) {