clang-format: Add an option 'SpaceAfterCStyleCast'.

This permits to add a space after closing parenthesis of a C-style cast.
Defaults to false to preserve old behavior.

Fixes llvm.org/PR19982.

Before:
  (int)i;

After:
  (int) i;

Patch by Marek Kurdej.

llvm-svn: 217022

clang/docs/ClangFormatStyleOptions.rst

@@ -411,6 +411,9 @@ the configuration (without a prefix: ``Auto``).
 **SpacesInCStyleCastParentheses** (``bool``)
   If ``true``, spaces may be inserted into C style casts.
 
+**SpaceAfterCStyleCast** (``bool``)
+  If ``true``, a space may be inserted after C style casts.
+
 **SpacesInContainerLiterals** (``bool``)
   If ``true``, spaces are inserted inside container literals (e.g.
   ObjC and Javascript array and dict literals).

clang/include/clang/Format/Format.h

@@ -324,6 +324,9 @@ struct FormatStyle {
   /// \brief If \c true, spaces may be inserted into C style casts.
   bool SpacesInCStyleCastParentheses;
 
+  /// \brief If \c true, a space may be inserted after C style casts.
+  bool SpaceAfterCStyleCast;
+
   /// \brief Different ways to put a space before opening parentheses.
   enum SpaceBeforeParensOptions {
     /// Never put a space before opening parentheses.
@@ -422,6 +425,7 @@ struct FormatStyle {
            SpaceInEmptyParentheses == R.SpaceInEmptyParentheses &&
            SpacesInContainerLiterals == R.SpacesInContainerLiterals &&
            SpacesInCStyleCastParentheses == R.SpacesInCStyleCastParentheses &&
+           SpaceAfterCStyleCast == R.SpaceAfterCStyleCast &&
            SpaceBeforeParens == R.SpaceBeforeParens &&
            SpaceBeforeAssignmentOperators == R.SpaceBeforeAssignmentOperators &&
            ContinuationIndentWidth == R.ContinuationIndentWidth &&

clang/lib/Format/Format.cpp

@@ -228,6 +228,7 @@ template <> struct MappingTraits<FormatStyle> {
     IO.mapOptional("SpaceInEmptyParentheses", Style.SpaceInEmptyParentheses);
     IO.mapOptional("SpacesInCStyleCastParentheses",
                    Style.SpacesInCStyleCastParentheses);
+    IO.mapOptional("SpaceAfterCStyleCast", Style.SpaceAfterCStyleCast);
     IO.mapOptional("SpacesInContainerLiterals",
                    Style.SpacesInContainerLiterals);
     IO.mapOptional("SpaceBeforeAssignmentOperators",
@@ -351,6 +352,7 @@ FormatStyle getLLVMStyle() {
   LLVMStyle.SpaceInEmptyParentheses = false;
   LLVMStyle.SpacesInContainerLiterals = true;
   LLVMStyle.SpacesInCStyleCastParentheses = false;
+  LLVMStyle.SpaceAfterCStyleCast = false;
   LLVMStyle.SpaceBeforeParens = FormatStyle::SBPO_ControlStatements;
   LLVMStyle.SpaceBeforeAssignmentOperators = true;
   LLVMStyle.SpacesInAngles = false;

clang/lib/Format/TokenAnnotator.cpp

@@ -1641,9 +1641,10 @@ bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
            Tok.getNextNonComment() && Tok.Type != TT_ObjCMethodExpr &&
            !Tok.Previous->is(tok::question) &&
            (Tok.Type != TT_DictLiteral || Style.SpacesInContainerLiterals);
-  if (Tok.Previous->Type == TT_UnaryOperator ||
-      Tok.Previous->Type == TT_CastRParen)
+  if (Tok.Previous->Type == TT_UnaryOperator)
     return Tok.Type == TT_BinaryOperator;
+  if (Tok.Previous->Type == TT_CastRParen)
+    return Style.SpaceAfterCStyleCast || Tok.Type == TT_BinaryOperator;
   if (Tok.Previous->is(tok::greater) && Tok.is(tok::greater)) {
     return Tok.Type == TT_TemplateCloser &&
            Tok.Previous->Type == TT_TemplateCloser &&

clang/unittests/Format/FormatTest.cpp

@@ -7721,6 +7721,38 @@ TEST_F(FormatTest, ConfigurableSpacesInParentheses) {
                "default:\n"
                "  break;\n"
                "}", Spaces);
+
+  Spaces.SpaceAfterCStyleCast = true;
+  verifyFormat("call(x, y, z);", Spaces);
+  verifyFormat("while (( bool ) 1)\n"
+               "  continue;",
+               Spaces);
+  verifyFormat("for (;;)\n"
+               "  continue;",
+               Spaces);
+  verifyFormat("if (true)\n"
+               "  f( );\n"
+               "else if (true)\n"
+               "  f( );",
+               Spaces);
+  verifyFormat("do {\n"
+               "  do_something(( int ) i);\n"
+               "} while (something( ));",
+               Spaces);
+  verifyFormat("switch (x) {\n"
+               "default:\n"
+               "  break;\n"
+               "}",
+               Spaces);
+  Spaces.SpacesInCStyleCastParentheses = false;
+  Spaces.SpaceAfterCStyleCast = true;
+  verifyFormat("while ((bool) 1)\n"
+               "  continue;",
+               Spaces);
+  verifyFormat("do {\n"
+               "  do_something((int) i);\n"
+               "} while (something( ));",
+               Spaces);
 }
 
 TEST_F(FormatTest, ConfigurableSpacesInSquareBrackets) {
@@ -8306,6 +8338,7 @@ TEST_F(FormatTest, ParsesConfigurationBools) {
   CHECK_PARSE_BOOL(SpaceInEmptyParentheses);
   CHECK_PARSE_BOOL(SpacesInContainerLiterals);
   CHECK_PARSE_BOOL(SpacesInCStyleCastParentheses);
+  CHECK_PARSE_BOOL(SpaceAfterCStyleCast);
   CHECK_PARSE_BOOL(SpaceBeforeAssignmentOperators);
 }