clang-format: Add SpaceAfterTemplate

Summary:
This is required for compliance with the Mozilla style guide.

This is a rebase+minor change of Birunthan Mohanathas's patch


Reviewers: djasper

Subscribers: klimek, cfe-commits, opilarium

Differential Revision: https://reviews.llvm.org/D23317

llvm-svn: 278121

clang/docs/ClangFormatStyleOptions.rst

@@ -670,6 +670,9 @@ the configuration (without a prefix: ``Auto``).
 **SpaceAfterCStyleCast** (``bool``)
   If ``true``, a space may be inserted after C style casts.
 
+**SpaceAfterTemplateKeyword** (``bool``)
+  If ``true``, a space will be inserted after the 'template' keyword.
+
 **SpaceBeforeAssignmentOperators** (``bool``)
   If ``false``, spaces will be removed before assignment operators.
 

clang/include/clang/Format/Format.h

@@ -549,6 +549,9 @@ struct FormatStyle {
   /// \brief If ``true``, a space may be inserted after C style casts.
   bool SpaceAfterCStyleCast;
 
+  /// \brief If \c true, a space will be inserted after the 'template' keyword.
+  bool SpaceAfterTemplateKeyword;
+
   /// \brief If ``false``, spaces will be removed before assignment operators.
   bool SpaceBeforeAssignmentOperators;
 
@@ -698,6 +701,7 @@ struct FormatStyle {
            PenaltyReturnTypeOnItsOwnLine == R.PenaltyReturnTypeOnItsOwnLine &&
            PointerAlignment == R.PointerAlignment &&
            SpaceAfterCStyleCast == R.SpaceAfterCStyleCast &&
+           SpaceAfterTemplateKeyword == R.SpaceAfterTemplateKeyword &&
            SpaceBeforeAssignmentOperators == R.SpaceBeforeAssignmentOperators &&
            SpaceBeforeParens == R.SpaceBeforeParens &&
            SpaceInEmptyParentheses == R.SpaceInEmptyParentheses &&

clang/lib/Format/Format.cpp

@@ -338,6 +338,7 @@ template <> struct MappingTraits<FormatStyle> {
     IO.mapOptional("ReflowComments", Style.ReflowComments);
     IO.mapOptional("SortIncludes", Style.SortIncludes);
     IO.mapOptional("SpaceAfterCStyleCast", Style.SpaceAfterCStyleCast);
+    IO.mapOptional("SpaceAfterTemplateKeyword", Style.SpaceAfterTemplateKeyword);
     IO.mapOptional("SpaceBeforeAssignmentOperators",
                    Style.SpaceBeforeAssignmentOperators);
     IO.mapOptional("SpaceBeforeParens", Style.SpaceBeforeParens);
@@ -552,6 +553,7 @@ FormatStyle getLLVMStyle() {
   LLVMStyle.SpacesInContainerLiterals = true;
   LLVMStyle.SpacesInCStyleCastParentheses = false;
   LLVMStyle.SpaceAfterCStyleCast = false;
+  LLVMStyle.SpaceAfterTemplateKeyword = true;
   LLVMStyle.SpaceBeforeParens = FormatStyle::SBPO_ControlStatements;
   LLVMStyle.SpaceBeforeAssignmentOperators = true;
   LLVMStyle.SpacesInAngles = false;
@@ -663,6 +665,7 @@ FormatStyle getMozillaStyle() {
   MozillaStyle.ObjCSpaceBeforeProtocolList = false;
   MozillaStyle.PenaltyReturnTypeOnItsOwnLine = 200;
   MozillaStyle.PointerAlignment = FormatStyle::PAS_Left;
+  MozillaStyle.SpaceAfterTemplateKeyword = false;
   return MozillaStyle;
 }
 

clang/lib/Format/TokenAnnotator.cpp

@@ -1984,9 +1984,10 @@ bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
   if (Right.isOneOf(tok::semi, tok::comma))
     return false;
   if (Right.is(tok::less) &&
-      (Left.is(tok::kw_template) ||
-       (Line.Type == LT_ObjCDecl && Style.ObjCSpaceBeforeProtocolList)))
+      Line.Type == LT_ObjCDecl && Style.ObjCSpaceBeforeProtocolList)
     return true;
+  if (Right.is(tok::less) && Left.is(tok::kw_template))
+    return Style.SpaceAfterTemplateKeyword;
   if (Left.isOneOf(tok::exclaim, tok::tilde))
     return false;
   if (Left.is(tok::at) &&

clang/unittests/Format/FormatTest.cpp

@@ -10191,6 +10191,7 @@ TEST_F(FormatTest, ParsesConfigurationBools) {
   CHECK_PARSE_BOOL(SpacesInContainerLiterals);
   CHECK_PARSE_BOOL(SpacesInCStyleCastParentheses);
   CHECK_PARSE_BOOL(SpaceAfterCStyleCast);
+  CHECK_PARSE_BOOL(SpaceAfterTemplateKeyword);
   CHECK_PARSE_BOOL(SpaceBeforeAssignmentOperators);
 
   CHECK_PARSE_NESTED_BOOL(BraceWrapping, AfterClass);
@@ -11329,6 +11330,12 @@ TEST_F(FormatTest, SpacesInAngles) {
   verifyFormat("A<A<int>>();", Spaces);
 }
 
+TEST_F(FormatTest, SpaceAfterTemplateKeyword) {
+  FormatStyle Style = getLLVMStyle();
+  Style.SpaceAfterTemplateKeyword = false;
+  verifyFormat("template<int> void foo();", Style);
+}
+
 TEST_F(FormatTest, TripleAngleBrackets) {
   verifyFormat("f<<<1, 1>>>();");
   verifyFormat("f<<<1, 1, 1, s>>>();");