[clang-format][NFC] Allow getLLVMStyle() to take a language

Summary:
getLLVMStyle() sets the default style, but doesn't take the language as a parameter, so can't set default parameters when they differ from C++. This change adds LanguageKind as an input to getLLVMStyle so that we can start doing that.

See D55964 as a motivation for this, where we want Tablegen to be formatted differently than C++.

Reviewers: djasper, krasimir, MyDeveloperDay

Reviewed By: MyDeveloperDay

Subscribers: jdoerfert, MyDeveloperDay, kristina, cfe-commits, arphaman

Tags: #clang

Differential Revision: https://reviews.llvm.org/D56943

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@355123 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Format/Format.h

@@ -1849,7 +1849,8 @@ private:
 
 /// Returns a format style complying with the LLVM coding standards:
 /// http://llvm.org/docs/CodingStandards.html.
-FormatStyle getLLVMStyle();
+FormatStyle getLLVMStyle(
+    FormatStyle::LanguageKind Language = FormatStyle::LanguageKind::LK_Cpp);
 
 /// Returns a format style complying with one of Google's style guides:
 /// http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml.

lib/Format/Format.cpp

@@ -618,9 +618,9 @@ static FormatStyle expandPresets(const FormatStyle &Style) {
   return Expanded;
 }
 
-FormatStyle getLLVMStyle() {
+FormatStyle getLLVMStyle(FormatStyle::LanguageKind Language) {
   FormatStyle LLVMStyle;
-  LLVMStyle.Language = FormatStyle::LK_Cpp;
+  LLVMStyle.Language = Language;
   LLVMStyle.AccessModifierOffset = -2;
   LLVMStyle.AlignEscapedNewlines = FormatStyle::ENAS_Right;
   LLVMStyle.AlignAfterOpenBracket = FormatStyle::BAS_Align;
@@ -729,8 +729,7 @@ FormatStyle getGoogleStyle(FormatStyle::LanguageKind Language) {
     return GoogleStyle;
   }
 
-  FormatStyle GoogleStyle = getLLVMStyle();
-  GoogleStyle.Language = Language;
+  FormatStyle GoogleStyle = getLLVMStyle(Language);
 
   GoogleStyle.AccessModifierOffset = -1;
   GoogleStyle.AlignEscapedNewlines = FormatStyle::ENAS_Left;
@@ -2344,8 +2343,7 @@ llvm::Expected<FormatStyle> getStyle(StringRef StyleName, StringRef FileName,
   if (!FS) {
     FS = llvm::vfs::getRealFileSystem().get();
   }
-  FormatStyle Style = getLLVMStyle();
-  Style.Language = guessLanguage(FileName, Code);
+  FormatStyle Style = getLLVMStyle(guessLanguage(FileName, Code));
 
   FormatStyle FallbackStyle = getNoStyle();
   if (!getPredefinedStyle(FallbackStyleName, Style.Language, &FallbackStyle))

unittests/Format/FormatTest.cpp

@@ -120,6 +120,15 @@ TEST_F(FormatTest, MessUp) {
   EXPECT_EQ("a\n#b c d\ne", test::messUp("a\n#b\\\nc\\\nd\ne"));
 }
 
+TEST_F(FormatTest, DefaultLLVMStyleIsCpp) {
+  EXPECT_EQ(FormatStyle::LK_Cpp, getLLVMStyle().Language);
+}
+
+TEST_F(FormatTest, LLVMStyleOverride) {
+  EXPECT_EQ(FormatStyle::LK_Proto,
+            getLLVMStyle(FormatStyle::LK_Proto).Language);
+}
+
 //===----------------------------------------------------------------------===//
 // Basic function tests.
 //===----------------------------------------------------------------------===//