Normal indent for last element of builder-type call.

In builder type call, we indent to the laster function calls.
However, for the last element of such a call, we don't need to do
so, as that normally just wastes space and does not increase
readability.

Before:
aaaaaa->aaaaaa->aaaaaa( // break
                  aaaaaa);
aaaaaaaaaaaaaaaaaaaaa->aaaaaaaaaaaaaaaaaaaaaa
    ->aaaaaaaaaaaaaaaaaaaaaaaaaa(
        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa);

After:
aaaaaa->aaaaaa->aaaaaa( // break
    aaaaaa);
aaaaaaaaaaaaaaaaaaaaa->aaaaaaaaaaaaaaaaaaaaaa->aaaaaaaaaaaaaaaaaaaaaaaaaa(
    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa);

llvm-svn: 176352

clang/lib/Format/Format.cpp

@@ -339,7 +339,8 @@ private:
         : Indent(Indent), LastSpace(LastSpace), FirstLessLess(0),
           BreakBeforeClosingBrace(false), QuestionColumn(0),
           AvoidBinPacking(AvoidBinPacking), BreakBeforeParameter(false),
-          HasMultiParameterLine(HasMultiParameterLine), ColonPos(0) {}
+          HasMultiParameterLine(HasMultiParameterLine), ColonPos(0),
+          StartOfFunctionCall(0) {}
 
     /// \brief The position to which a specific parenthesis level needs to be
     /// indented.
@@ -382,6 +383,9 @@ private:
     /// \brief The position of the colon in an ObjC method declaration/call.
     unsigned ColonPos;
 
+    /// \brief The start of the most recent function in a builder-type call.
+    unsigned StartOfFunctionCall;
+
     bool operator<(const ParenState &Other) const {
       if (Indent != Other.Indent)
         return Indent < Other.Indent;
@@ -401,6 +405,8 @@ private:
         return HasMultiParameterLine;
       if (ColonPos != Other.ColonPos)
         return ColonPos < Other.ColonPos;
+      if (StartOfFunctionCall != Other.StartOfFunctionCall)
+        return StartOfFunctionCall < Other.StartOfFunctionCall;
       return false;
     }
   };
@@ -622,9 +628,6 @@ 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;
     }
 
     return moveStateToNextToken(State, DryRun);
@@ -642,6 +645,10 @@ private:
       State.Stack.back().FirstLessLess = State.Column;
     if (Current.is(tok::question))
       State.Stack.back().QuestionColumn = State.Column;
+    if ((Current.is(tok::period) || Current.is(tok::arrow)) &&
+        Line.Type == LT_BuilderTypeCall && State.ParenLevel == 0)
+      State.Stack.back().StartOfFunctionCall =
+          Current.LastInChainOfCalls ? 0 : State.Column;
     if (Current.Type == TT_CtorInitializerColon) {
       if (Style.ConstructorInitializerAllOnOneLineOrOnePerLine)
         State.Stack.back().AvoidBinPacking = true;
@@ -667,7 +674,8 @@ private:
         NewIndent = 2 + State.Stack.back().LastSpace;
         AvoidBinPacking = false;
       } else {
-        NewIndent = 4 + State.Stack.back().LastSpace;
+        NewIndent = 4 + std::max(State.Stack.back().LastSpace,
+                                 State.Stack.back().StartOfFunctionCall);
         AvoidBinPacking =
             !Style.BinPackParameters || State.Stack.back().AvoidBinPacking;
       }

clang/lib/Format/TokenAnnotator.cpp

@@ -464,6 +464,7 @@ private:
 public:
   LineType parseLine() {
     int PeriodsAndArrows = 0;
+    AnnotatedToken *LastPeriodOrArrow = NULL;
     bool CanBeBuilderTypeStmt = true;
     if (CurrentToken->is(tok::hash)) {
       parsePreprocessorDirective();
@@ -472,8 +473,10 @@ public:
     while (CurrentToken != NULL) {
       if (CurrentToken->is(tok::kw_virtual))
         KeywordVirtualFound = true;
-      if (CurrentToken->is(tok::period) || CurrentToken->is(tok::arrow))
+      if (CurrentToken->is(tok::period) || CurrentToken->is(tok::arrow)) {
         ++PeriodsAndArrows;
+        LastPeriodOrArrow = CurrentToken;
+      }
       AnnotatedToken *TheToken = CurrentToken;
       if (!consumeToken())
         return LT_Invalid;
@@ -485,8 +488,10 @@ public:
       return LT_VirtualFunctionDecl;
 
     // Assume a builder-type call if there are 2 or more "." and "->".
-    if (PeriodsAndArrows >= 2 && CanBeBuilderTypeStmt)
+    if (PeriodsAndArrows >= 2 && CanBeBuilderTypeStmt) {
+      LastPeriodOrArrow->LastInChainOfCalls = true;
       return LT_BuilderTypeCall;
+    }
 
     if (Line.First.Type == TT_ObjCMethodSpecifier) {
       if (Contexts.back().FirstObjCSelectorName != NULL)
@@ -934,7 +939,7 @@ unsigned TokenAnnotator::splitPenalty(const AnnotatedLine &Line,
 
   if (Level != prec::Unknown)
     return Level;
-  
+
   return 3;
 }
 

clang/lib/Format/TokenAnnotator.h

@@ -75,7 +75,7 @@ public:
         ClosesTemplateDeclaration(false), MatchingParen(NULL),
         ParameterCount(0), BindingStrength(0), SplitPenalty(0),
         LongestObjCSelectorName(0), Parent(NULL), FakeLParens(0),
-        FakeRParens(0) {
+        FakeRParens(0), LastInChainOfCalls(false) {
   }
 
   bool is(tok::TokenKind Kind) const { return FormatTok.Tok.is(Kind); }
@@ -127,6 +127,9 @@ public:
   /// \brief Insert this many fake ) after this token for correct indentation.
   unsigned FakeRParens;
 
+  /// \brief Is this the last "." or "->" in a builder-type call?
+  bool LastInChainOfCalls;
+
   const AnnotatedToken *getPreviousNoneComment() const {
     AnnotatedToken *Tok = Parent;
     while (Tok != NULL && Tok->is(tok::comment))

clang/unittests/Format/FormatTest.cpp

@@ -1331,7 +1331,7 @@ TEST_F(FormatTest, FormatsBuilderPattern) {
       "    ->aaaaaaaa(aaaaaaaaaaaaaaa);");
   verifyFormat(
       "aaaaaaaaaaaaaaaaaaa()->aaaaaa(bbbbb)->aaaaaaaaaaaaaaaaaaa( // break\n"
-      "                                        aaaaaaaaaaaaaa);");
+      "    aaaaaaaaaaaaaa);");
   verifyFormat(
       "aaaaaaaaaaaaaaaaaaaaaaa *aaaaaaaaa = aaaaaa->aaaaaaaaaaaa()\n"
       "    ->aaaaaaaaaaaaaaaa(\n"