clang-format: Add CompactNamespaces option

Summary:
Add CompactNamespaces option, to pack namespace declarations on the
same line (somewhat similar to C++17 nested namespace definition).

With this option, consecutive namespace declarations are kept on the
same line:

  namespace foo { namespace bar {
      ...
  }} // namespace foo::bar

Reviewers: krasimir, djasper, klimek

Reviewed By: djasper

Subscribers: kimgr, cfe-commits, klimek

Tags: #clang-tools-extra

Differential Revision: https://reviews.llvm.org/D32480

llvm-svn: 305384

1 files changed, 5 insertions, 3 deletions

diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index 0eaf44d2048..39da87cf998 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -310,6 +310,8 @@ template <> struct MappingTraits<FormatStyle> {
     IO.mapOptional("BreakBeforeBinaryOperators",
                    Style.BreakBeforeBinaryOperators);
     IO.mapOptional("BreakBeforeBraces", Style.BreakBeforeBraces);
+    IO.mapOptional("BreakBeforeInheritanceComma",
+                   Style.BreakBeforeInheritanceComma);
     IO.mapOptional("BreakBeforeTernaryOperators",
                    Style.BreakBeforeTernaryOperators);
 
@@ -330,8 +332,7 @@ template <> struct MappingTraits<FormatStyle> {
     IO.mapOptional("BreakStringLiterals", Style.BreakStringLiterals);
     IO.mapOptional("ColumnLimit", Style.ColumnLimit);
     IO.mapOptional("CommentPragmas", Style.CommentPragmas);
-    IO.mapOptional("BreakBeforeInheritanceComma",
-                   Style.BreakBeforeInheritanceComma);
+    IO.mapOptional("CompactNamespaces", Style.CompactNamespaces);
     IO.mapOptional("ConstructorInitializerAllOnOneLineOrOnePerLine",
                    Style.ConstructorInitializerAllOnOneLineOrOnePerLine);
     IO.mapOptional("ConstructorInitializerIndentWidth",
@@ -550,8 +551,8 @@ FormatStyle getLLVMStyle() {
   LLVMStyle.AlwaysBreakAfterDefinitionReturnType = FormatStyle::DRTBS_None;
   LLVMStyle.AlwaysBreakBeforeMultilineStrings = false;
   LLVMStyle.AlwaysBreakTemplateDeclarations = false;
-  LLVMStyle.BinPackParameters = true;
   LLVMStyle.BinPackArguments = true;
+  LLVMStyle.BinPackParameters = true;
   LLVMStyle.BreakBeforeBinaryOperators = FormatStyle::BOS_None;
   LLVMStyle.BreakBeforeTernaryOperators = true;
   LLVMStyle.BreakBeforeBraces = FormatStyle::BS_Attach;
@@ -563,6 +564,7 @@ FormatStyle getLLVMStyle() {
   LLVMStyle.BreakStringLiterals = true;
   LLVMStyle.ColumnLimit = 80;
   LLVMStyle.CommentPragmas = "^ IWYU pragma:";
+  LLVMStyle.CompactNamespaces = false;
   LLVMStyle.ConstructorInitializerAllOnOneLineOrOnePerLine = false;
   LLVMStyle.ConstructorInitializerIndentWidth = 4;
   LLVMStyle.ContinuationIndentWidth = 4;