Add option to allow putting all parameters onto the next line.

This only affects styles where BinPackParameters is false.

With AllowAllParametersOnNextLine:
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(
    aaaaaaaaaa, aaaaaaaaaa, aaaaaaaaaa, aaaaaaaaaaa, aaaaaaaaaaa);

Without it:
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(aaaaaaaaaa,
                                         aaaaaaaaaa,
                                         aaaaaaaaaa,
                                         aaaaaaaaaaa,
                                         aaaaaaaaaaa);

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173246 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Format/Format.h

@@ -61,6 +61,10 @@ struct FormatStyle {
   /// will either all be on the same line or will have one line each.
   bool BinPackParameters;
 
+  /// \brief Allow putting all parameters of a function declaration/call onto
+  /// the next line without calling this bin-packing.
+  bool AllowAllParametersOnNextLine;
+
   /// \brief If the constructor initializers don't fit on a line, put each
   /// initializer on its own line.
   bool ConstructorInitializerAllOnOneLineOrOnePerLine;

lib/Format/Format.cpp

@@ -159,6 +159,7 @@ FormatStyle getLLVMStyle() {
   LLVMStyle.IndentCaseLabels = false;
   LLVMStyle.SpacesBeforeTrailingComments = 1;
   LLVMStyle.BinPackParameters = true;
+  LLVMStyle.AllowAllParametersOnNextLine = true;
   LLVMStyle.ConstructorInitializerAllOnOneLineOrOnePerLine = false;
   LLVMStyle.AllowShortIfStatementsOnASingleLine = false;
   LLVMStyle.ObjCSpaceBeforeProtocolList = true;
@@ -175,6 +176,7 @@ FormatStyle getGoogleStyle() {
   GoogleStyle.IndentCaseLabels = true;
   GoogleStyle.SpacesBeforeTrailingComments = 2;
   GoogleStyle.BinPackParameters = false;
+  GoogleStyle.AllowAllParametersOnNextLine = true;
   GoogleStyle.ConstructorInitializerAllOnOneLineOrOnePerLine = true;
   GoogleStyle.AllowShortIfStatementsOnASingleLine = false;
   GoogleStyle.ObjCSpaceBeforeProtocolList = false;
@@ -183,7 +185,7 @@ FormatStyle getGoogleStyle() {
 
 FormatStyle getChromiumStyle() {
   FormatStyle ChromiumStyle = getGoogleStyle();
-  ChromiumStyle.AllowShortIfStatementsOnASingleLine = false;
+  ChromiumStyle.AllowAllParametersOnNextLine = false;
   return ChromiumStyle;
 }
 
@@ -607,12 +609,20 @@ private:
     if (Newline && Previous.is(tok::l_brace))
       State.Stack.back().BreakBeforeClosingBrace = true;
 
-    // If we are breaking after '(', '{', '<' or ',', we need to break after
-    // future commas as well to avoid bin packing.
-    if (!Style.BinPackParameters && Newline &&
-        (Previous.is(tok::comma) || Previous.is(tok::l_paren) ||
-         Previous.is(tok::l_brace) || Previous.Type == TT_TemplateOpener))
-      State.Stack.back().BreakAfterComma = true;
+    if (!Style.BinPackParameters && Newline) {
+      // If we are breaking after '(', '{', '<', this is not bin packing unless
+      // AllowAllParametersOnNextLine is false.
+      if ((Previous.isNot(tok::l_paren) && Previous.isNot(tok::l_brace) &&
+           Previous.Type != TT_TemplateOpener) ||
+          !Style.AllowAllParametersOnNextLine)
+        State.Stack.back().BreakAfterComma = true;
+      
+      // Any break on this level means that the parent level has been broken
+      // and we need to avoid bin packing there.
+      for (unsigned i = 0, e = State.Stack.size() - 1; i != e; ++i) {
+        State.Stack[i].BreakAfterComma = true;
+      }
+    }
 
     moveStateToNextToken(State);
   }
@@ -642,17 +652,6 @@ private:
       }
       State.Stack.push_back(
           ParenState(NewIndent, State.Stack.back().LastSpace));
-
-      // If the entire set of parameters will not fit on the current line, we
-      // will need to break after commas on this level to avoid bin-packing.
-      if (!Style.BinPackParameters && Current.MatchingParen != NULL &&
-          !Current.Children.empty()) {
-        if (getColumnLimit() < State.Column + Current.FormatTok.TokenLength +
-            Current.MatchingParen->TotalLength -
-            Current.Children[0].TotalLength) {
-          State.Stack.back().BreakAfterComma = true;
-        }
-      }
     }
 
     // If we encounter a closing ), ], } or >, we can remove a level from our

unittests/Format/FormatTest.cpp

@@ -964,9 +964,15 @@ TEST_F(FormatTest, FormatsOneParameterPerLineIfNecessary) {
       "         aaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(\n"
       "             aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)));");
   verifyGoogleFormat(
-      "aaaaaaaaaaaaaaa(aaaaaaaaa,\n"
-      "                aaaaaaaaa,\n"
-      "                aaaaaaaaaaaaaaaaaaaaaaa).aaaaaaaaaaaaaaaaaa();");
+      "aaaaaaaaaaaaaaa(\n"
+      "    aaaaaaaaa, aaaaaaaaa, aaaaaaaaaaaaaaaaaaaaa).aaaaaaaaaaaaaaaaaa();");
+  verifyGoogleFormat("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(\n"
+                     "    aaaaaaaaaa, aaaaaaaaaa, aaaaaaaaaa, aaaaaaaaaaa);");
+  
+  verifyGoogleFormat(
+      "aaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaaaaa + aaaaaaaaaaaaaaaaaaaaaaaaa,\n"
+      "             aaaaaaaaaaaa,\n"
+      "             aaaaaaaaaaaa);");
   verifyGoogleFormat(
       "somefunction(someotherFunction(ddddddddddddddddddddddddddddddddddd,\n"
       "                               ddddddddddddddddddddddddddddd),\n"
@@ -979,6 +985,13 @@ TEST_F(FormatTest, FormatsOneParameterPerLineIfNecessary) {
   verifyGoogleFormat("a(\"a\"\n"
                      "  \"a\",\n"
                      "  a);");
+
+  FormatStyle Style = getGoogleStyle();
+  Style.AllowAllParametersOnNextLine = false;
+  verifyFormat("aaaaaaaaaaaaaaa(aaaaaaaaa,\n"
+               "                aaaaaaaaa,\n"
+               "                aaaaaaaaaaaaaaaaaaaaa).aaaaaaaaaaaaaaaaaa();",
+               Style);
 }
 
 TEST_F(FormatTest, FormatsBuilderPattern) {