Reduce penalty for splitting between ")" and ".".

').' is likely part of a builder pattern statement.
This is based upon a patch developed by Nico Weber. Thank you!

Before:
int foo() {
  return llvm::StringSwitch<Reference::Kind>(name).StartsWith(
      ".eh_frame_hdr", ORDER_EH_FRAMEHDR).StartsWith(
      ".eh_frame", ORDER_EH_FRAME).StartsWith(".init", ORDER_INIT).StartsWith(
      ".fini", ORDER_FINI).StartsWith(".hash", ORDER_HASH).Default(ORDER_TEXT);
}

After:
int foo() {
  return llvm::StringSwitch<Reference::Kind>(name)
         .StartsWith(".eh_frame_hdr", ORDER_EH_FRAMEHDR)
         .StartsWith(".eh_frame", ORDER_EH_FRAME)
         .StartsWith(".init", ORDER_INIT).StartsWith(".fini", ORDER_FINI)
         .StartsWith(".hash", ORDER_HASH).Default(ORDER_TEXT);
}

Probably not ideal, but makes many cases much more readable.

The changes to overriding-ftemplate-comments.cpp don't seem better or
worse. We should address those soon.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172804 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 26 insertions, 13 deletions

diff --git a/lib/Format/Format.cpp b/lib/Format/Format.cpp
index 50df593d85..1821937ec3 100644
--- a/lib/Format/Format.cpp
+++ b/lib/Format/Format.cpp
@@ -322,7 +322,7 @@ public:
       : Style(Style), SourceMgr(SourceMgr), Line(Line),
         FirstIndent(FirstIndent), RootToken(RootToken),
         Whitespaces(Whitespaces) {
-    Parameters.PenaltyIndentLevel = 15;
+    Parameters.PenaltyIndentLevel = 20;
     Parameters.PenaltyLevelDecrease = 30;
     Parameters.PenaltyExcessCharacter = 1000000;
   }
@@ -674,8 +674,7 @@ private:
         (Left.isNot(tok::comma) && Left.isNot(tok::semi)))
       return 20;
 
-    if (Left.is(tok::semi) || Left.is(tok::comma) ||
-        Left.ClosesTemplateDeclaration)
+    if (Left.is(tok::semi) || Left.is(tok::comma))
       return 0;
 
     // In Objective-C method expressions, prefer breaking before "param:" over
@@ -700,8 +699,11 @@ private:
     if (Level != prec::Unknown)
       return Level;
 
-    if (Right.is(tok::arrow) || Right.is(tok::period))
+    if (Right.is(tok::arrow) || Right.is(tok::period)) {
+      if (Left.is(tok::r_paren))
+        return 15; // Should be smaller than breaking at a nested comma.
       return 150;
+    }
 
     return 3;
   }
@@ -746,7 +748,9 @@ private:
     if (NewLine && State.NextToken->Parent->is(tok::comma) &&
         State.Stack.back().HasMultiParameterLine && !Style.BinPackParameters)
       return UINT_MAX;
-    if (!NewLine && State.NextToken->Type == TT_CtorInitializerColon)
+    if (!NewLine && (State.NextToken->Type == TT_CtorInitializerColon ||
+                     (State.NextToken->Parent->ClosesTemplateDeclaration &&
+                      State.Stack.size() == 1)))
       return UINT_MAX;
 
     unsigned CurrentPenalty = 0;
diff --git a/test/Index/overriding-ftemplate-comments.cpp b/test/Index/overriding-ftemplate-comments.cpp
index 50d4e87da2..8d4a577d96 100644
--- a/test/Index/overriding-ftemplate-comments.cpp
+++ b/test/Index/overriding-ftemplate-comments.cpp
@@ -74,13 +74,13 @@ void comment_to_html_conversion_21();
 /// \tparam C3 Ccc 3
 /// \tparam C4 Ccc 4
 /// \tparam BBB Bbb
-template<class C1, template<class C2, template<class C3, class C4> class BBB> class AAA>
+template <class C1, template <class C2, template <class C3, class C4> class BBB > class AAA >
 void comment_to_html_conversion_22();
 
-// CHECK: FullCommentAsXML=[<Function templateKind="template" file="{{[^"]+}}overriding-ftemplate-comments.cpp" line="[[@LINE-2]]" column="6"><Name>comment_to_html_conversion_22</Name><USR>c:@FT@&gt;2#T#t&gt;2#T#t&gt;2#T#Tcomment_to_html_conversion_22#</USR><Declaration>template &lt;class C1,\n          template &lt;class C2, template &lt;class C3, class C4&gt;\n                class BBB &gt; class AAA &gt; void comment_to_html_conversion_22()</Declaration><TemplateParameters><Parameter><Name>C1</Name><Index>0</Index><Discussion><Para> Ccc 1 </Para></Discussion></Parameter><Parameter><Name>AAA</Name><Index>1</Index><Discussion><Para> Zzz </Para></Discussion></Parameter><Parameter><Name>C2</Name><Discussion><Para> Ccc 2 </Para></Discussion></Parameter><Parameter><Name>C3</Name><Discussion><Para> Ccc 3 </Para></Discussion></Parameter><Parameter><Name>C4</Name><Discussion><Para> Ccc 4 </Para></Discussion></Parameter><Parameter><Name>BBB</Name><Discussion><Para> Bbb</Para></Discussion></Parameter></TemplateParameters></Function>]
+// CHECK: FullCommentAsXML=[<Function templateKind="template" file="{{[^"]+}}overriding-ftemplate-comments.cpp" line="[[@LINE-2]]" column="6"><Name>comment_to_html_conversion_22</Name><USR>c:@FT@&gt;2#T#t&gt;2#T#t&gt;2#T#Tcomment_to_html_conversion_22#</USR><Declaration>template &lt;class C1,\n          template &lt;class C2, template &lt;class C3, class C4&gt; class BBB &gt;\n                    class AAA &gt; void comment_to_html_conversion_22()</Declaration><TemplateParameters><Parameter><Name>C1</Name><Index>0</Index><Discussion><Para> Ccc 1 </Para></Discussion></Parameter><Parameter><Name>AAA</Name><Index>1</Index><Discussion><Para> Zzz </Para></Discussion></Parameter><Parameter><Name>C2</Name><Discussion><Para> Ccc 2 </Para></Discussion></Parameter><Parameter><Name>C3</Name><Discussion><Para> Ccc 3 </Para></Discussion></Parameter><Parameter><Name>C4</Name><Discussion><Para> Ccc 4 </Para></Discussion></Parameter><Parameter><Name>BBB</Name><Discussion><Para> Bbb</Para></Discussion></Parameter></TemplateParameters></Function>]
 
 template<class CCC1, template<class CCC2, template<class CCC3, class CCC4> class QQQ> class PPP>
 void comment_to_html_conversion_22();
 
-// CHECK: FullCommentAsXML=[<Function templateKind="template" file="{{[^"]+}}overriding-ftemplate-comments.cpp" line="[[@LINE-2]]" column="6"><Name>comment_to_html_conversion_22</Name><USR>c:@FT@&gt;2#T#t&gt;2#T#t&gt;2#T#Tcomment_to_html_conversion_22#</USR><Declaration>template &lt;class CCC1,\n          template &lt;class CCC2, template &lt;class CCC3, class CCC4&gt;\n                class QQQ &gt; class PPP &gt; void comment_to_html_conversion_22()</Declaration><TemplateParameters><Parameter><Name>CCC1</Name><Index>0</Index><Discussion><Para> Ccc 1 </Para></Discussion></Parameter><Parameter><Name>PPP</Name><Index>1</Index><Discussion><Para> Zzz </Para></Discussion></Parameter><Parameter><Name>CCC2</Name><Discussion><Para> Ccc 2 </Para></Discussion></Parameter><Parameter><Name>CCC3</Name><Discussion><Para> Ccc 3 </Para></Discussion></Parameter><Parameter><Name>CCC4</Name><Discussion><Para> Ccc 4 </Para></Discussion></Parameter><Parameter><Name>QQQ</Name><Discussion><Para> Bbb</Para></Discussion></Parameter></TemplateParameters></Function>]
+// CHECK: FullCommentAsXML=[<Function templateKind="template" file="{{[^"]+}}overriding-ftemplate-comments.cpp" line="[[@LINE-2]]" column="6"><Name>comment_to_html_conversion_22</Name><USR>c:@FT@&gt;2#T#t&gt;2#T#t&gt;2#T#Tcomment_to_html_conversion_22#</USR><Declaration>template &lt;class CCC1,\n          template &lt;class CCC2, template &lt;class CCC3, class CCC4&gt; class QQQ &gt;\n                    class PPP &gt; void comment_to_html_conversion_22()</Declaration><TemplateParameters><Parameter><Name>CCC1</Name><Index>0</Index><Discussion><Para> Ccc 1 </Para></Discussion></Parameter><Parameter><Name>PPP</Name><Index>1</Index><Discussion><Para> Zzz </Para></Discussion></Parameter><Parameter><Name>CCC2</Name><Discussion><Para> Ccc 2 </Para></Discussion></Parameter><Parameter><Name>CCC3</Name><Discussion><Para> Ccc 3 </Para></Discussion></Parameter><Parameter><Name>CCC4</Name><Discussion><Para> Ccc 4 </Para></Discussion></Parameter><Parameter><Name>QQQ</Name><Discussion><Para> Bbb</Para></Discussion></Parameter></TemplateParameters></Function>]
 
diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index 51904d7d3f..806707cb4c 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -932,9 +932,8 @@ TEST_F(FormatTest, FormatsOneParameterPerLineIfNecessary) {
       "         aaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(\n"
       "             aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)));");
   verifyGoogleFormat(
-      "aaaaaaaaaaaaaaa(aaaaaaaaa,\n"
-      "                aaaaaaaaa,\n"
-      "                aaaaaaaaaaaaaaaaaaaaaaa).aaaaaaaaaaaaaaaaaa();");
+      "aaaaaaaaaaaaaaa(aaaaaaaaa, aaaaaaaaa, aaaaaaaaaaaaaaaaaaaaaaa)\n"
+      "    .aaaaaaaaaaaaaaaaaa();");
   verifyGoogleFormat(
       "somefunction(someotherFunction(ddddddddddddddddddddddddddddddddddd,\n"
       "                               ddddddddddddddddddddddddddddd),\n"
@@ -949,6 +948,15 @@ TEST_F(FormatTest, FormatsOneParameterPerLineIfNecessary) {
                      "  a);");
 }
 
+TEST_F(FormatTest, FormatsBuilderPattern) {
+  verifyFormat(
+      "return llvm::StringSwitch<Reference::Kind>(name)\n"
+      "       .StartsWith(\".eh_frame_hdr\", ORDER_EH_FRAMEHDR)\n"
+      "       .StartsWith(\".eh_frame\", ORDER_EH_FRAME).StartsWith(\".init\", ORDER_INIT)\n"
+      "       .StartsWith(\".fini\", ORDER_FINI).StartsWith(\".hash\", ORDER_HASH)\n"
+      "       .Default(ORDER_TEXT);\n");
+}
+
 TEST_F(FormatTest, DoesNotBreakTrailingAnnotation) {
   verifyFormat("void aaaaaaaaaaaa(int aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)\n"
                "    GUARDED_BY(aaaaaaaaaaaaa);");
@@ -1114,8 +1122,9 @@ TEST_F(FormatTest, WrapsTemplateDeclarations) {
   verifyFormat("template <typename T>\n"
                "virtual void loooooooooooongFunction(int Param1, int Param2);");
   verifyFormat(
-      "template <typename T> void f(int Paaaaaaaaaaaaaaaaaaaaaaaaaaaaaaram1,\n"
-      "                             int Paaaaaaaaaaaaaaaaaaaaaaaaaaaaaaram2);");
+      "template <typename T>\n"
+      "void f(int Paaaaaaaaaaaaaaaaaaaaaaaaaaaaaaram1,\n"
+      "       int Paaaaaaaaaaaaaaaaaaaaaaaaaaaaaaram2);");
   verifyFormat(
       "template <typename T>\n"
       "void looooooooooooooooooooongFunction(int Paaaaaaaaaaaaaaaaaaaaram1,\n"