Format.h

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//===--- Format.h - Format C++ code -----------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Various functions to configurably format source code.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_FORMAT_FORMAT_H
#define LLVM_CLANG_FORMAT_FORMAT_H

#include "clang/Basic/LangOptions.h"
#include "clang/Tooling/Core/Replacement.h"
#include "clang/Tooling/Inclusions/IncludeStyle.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/Support/Regex.h"
#include <system_error>

namespace clang {

class Lexer;
class SourceManager;
class DiagnosticConsumer;

namespace vfs {
class FileSystem;
}

namespace format {

enum class ParseError { Success = 0, Error, Unsuitable };
class ParseErrorCategory final : public std::error_category {
public:
  const char *name() const noexcept override;
  std::string message(int EV) const override;
};
const std::error_category &getParseCategory();
std::error_code make_error_code(ParseError e);

/// The ``FormatStyle`` is used to configure the formatting to follow
/// specific guidelines.
struct FormatStyle {
  /// The extra indent or outdent of access modifiers, e.g. ``public:``.
  int AccessModifierOffset;

  /// Different styles for aligning after open brackets.
  enum BracketAlignmentStyle {
    /// Align parameters on the open bracket, e.g.:
    /// \code
    ///   someLongFunction(argument1,
    ///                    argument2);
    /// \endcode
    BAS_Align,
    /// Don't align, instead use ``ContinuationIndentWidth``, e.g.:
    /// \code
    ///   someLongFunction(argument1,
    ///       argument2);
    /// \endcode
    BAS_DontAlign,
    /// Always break after an open bracket, if the parameters don't fit
    /// on a single line, e.g.:
    /// \code
    ///   someLongFunction(
    ///       argument1, argument2);
    /// \endcode
    BAS_AlwaysBreak,
  };

  /// If ``true``, horizontally aligns arguments after an open bracket.
  ///
  /// This applies to round brackets (parentheses), angle brackets and square
  /// brackets.
  BracketAlignmentStyle AlignAfterOpenBracket;

  /// If ``true``, aligns consecutive assignments.
  ///
  /// This will align the assignment operators of consecutive lines. This
  /// will result in formattings like
  /// \code
  ///   int aaaa = 12;
  ///   int b    = 23;
  ///   int ccc  = 23;
  /// \endcode
  bool AlignConsecutiveAssignments;

  /// If ``true``, aligns consecutive declarations.
  ///
  /// This will align the declaration names of consecutive lines. This
  /// will result in formattings like
  /// \code
  ///   int         aaaa = 12;
  ///   float       b = 23;
  ///   std::string ccc = 23;
  /// \endcode
  bool AlignConsecutiveDeclarations;

  /// Different styles for aligning escaped newlines.
  enum EscapedNewlineAlignmentStyle {
    /// Don't align escaped newlines.
    /// \code
    ///   #define A \
    ///     int aaaa; \
    ///     int b; \
    ///     int dddddddddd;
    /// \endcode
    ENAS_DontAlign,
    /// Align escaped newlines as far left as possible.
    /// \code
    ///   true:
    ///   #define A   \
    ///     int aaaa; \
    ///     int b;    \
    ///     int dddddddddd;
    ///
    ///   false:
    /// \endcode
    ENAS_Left,
    /// Align escaped newlines in the right-most column.
    /// \code
    ///   #define A                                                                      \
    ///     int aaaa;                                                                    \
    ///     int b;                                                                       \
    ///     int dddddddddd;
    /// \endcode
    ENAS_Right,
  };

  /// Options for aligning backslashes in escaped newlines.
  EscapedNewlineAlignmentStyle AlignEscapedNewlines;

  /// If ``true``, horizontally align operands of binary and ternary
  /// expressions.
  ///
  /// Specifically, this aligns operands of a single expression that needs to be
  /// split over multiple lines, e.g.:
  /// \code
  ///   int aaa = bbbbbbbbbbbbbbb +
  ///             ccccccccccccccc;
  /// \endcode
  bool AlignOperands;

  /// If ``true``, aligns trailing comments.
  /// \code
  ///   true:                                   false:
  ///   int a;     // My comment a      vs.     int a; // My comment a
  ///   int b = 2; // comment  b                int b = 2; // comment about b
  /// \endcode
  bool AlignTrailingComments;

  /// If the function declaration doesn't fit on a line,
  /// allow putting all parameters of a function declaration onto
  /// the next line even if ``BinPackParameters`` is ``false``.
  /// \code
  ///   true:
  ///   void myFunction(
  ///       int a, int b, int c, int d, int e);
  ///
  ///   false:
  ///   void myFunction(int a,
  ///                   int b,
  ///                   int c,
  ///                   int d,
  ///                   int e);
  /// \endcode
  bool AllowAllParametersOfDeclarationOnNextLine;

  /// Allows contracting simple braced statements to a single line.
  ///
  /// E.g., this allows ``if (a) { return; }`` to be put on a single line.
  bool AllowShortBlocksOnASingleLine;

  /// If ``true``, short case labels will be contracted to a single line.
  /// \code
  ///   true:                                   false:
  ///   switch (a) {                    vs.     switch (a) {
  ///   case 1: x = 1; break;                   case 1:
  ///   case 2: return;                           x = 1;
  ///   }                                         break;
  ///                                           case 2:
  ///                                             return;
  ///                                           }
  /// \endcode
  bool AllowShortCaseLabelsOnASingleLine;

  /// Different styles for merging short functions containing at most one
  /// statement.
  enum ShortFunctionStyle {
    /// Never merge functions into a single line.
    SFS_None,
    /// Only merge functions defined inside a class. Same as "inline",
    /// except it does not implies "empty": i.e. top level empty functions
    /// are not merged either.
    /// \code
    ///   class Foo {
    ///     void f() { foo(); }
    ///   };
    ///   void f() {
    ///     foo();
    ///   }
    ///   void f() {
    ///   }
    /// \endcode
    SFS_InlineOnly,
    /// Only merge empty functions.
    /// \code
    ///   void f() {}
    ///   void f2() {
    ///     bar2();
    ///   }
    /// \endcode
    SFS_Empty,
    /// Only merge functions defined inside a class. Implies "empty".
    /// \code
    ///   class Foo {
    ///     void f() { foo(); }
    ///   };
    ///   void f() {
    ///     foo();
    ///   }
    ///   void f() {}
    /// \endcode
    SFS_Inline,
    /// Merge all functions fitting on a single line.
    /// \code
    ///   class Foo {
    ///     void f() { foo(); }
    ///   };
    ///   void f() { bar(); }
    /// \endcode
    SFS_All,
  };

  /// Dependent on the value, ``int f() { return 0; }`` can be put on a
  /// single line.
  ShortFunctionStyle AllowShortFunctionsOnASingleLine;

  /// If ``true``, ``if (a) return;`` can be put on a single line.
  bool AllowShortIfStatementsOnASingleLine;

  /// If ``true``, ``while (true) continue;`` can be put on a single
  /// line.
  bool AllowShortLoopsOnASingleLine;

  /// Different ways to break after the function definition return type.
  /// This option is **deprecated** and is retained for backwards compatibility.
  enum DefinitionReturnTypeBreakingStyle {
    /// Break after return type automatically.
    /// ``PenaltyReturnTypeOnItsOwnLine`` is taken into account.
    DRTBS_None,
    /// Always break after the return type.
    DRTBS_All,
    /// Always break after the return types of top-level functions.
    DRTBS_TopLevel,
  };

  /// Different ways to break after the function definition or
  /// declaration return type.
  enum ReturnTypeBreakingStyle {
    /// Break after return type automatically.
    /// ``PenaltyReturnTypeOnItsOwnLine`` is taken into account.
    /// \code
    ///   class A {
    ///     int f() { return 0; };
    ///   };
    ///   int f();
    ///   int f() { return 1; }
    /// \endcode
    RTBS_None,
    /// Always break after the return type.
    /// \code
    ///   class A {
    ///     int
    ///     f() {
    ///       return 0;
    ///     };
    ///   };
    ///   int
    ///   f();
    ///   int
    ///   f() {
    ///     return 1;
    ///   }
    /// \endcode
    RTBS_All,
    /// Always break after the return types of top-level functions.
    /// \code
    ///   class A {
    ///     int f() { return 0; };
    ///   };
    ///   int
    ///   f();
    ///   int
    ///   f() {
    ///     return 1;
    ///   }
    /// \endcode
    RTBS_TopLevel,
    /// Always break after the return type of function definitions.
    /// \code
    ///   class A {
    ///     int
    ///     f() {
    ///       return 0;
    ///     };
    ///   };
    ///   int f();
    ///   int
    ///   f() {
    ///     return 1;
    ///   }
    /// \endcode
    RTBS_AllDefinitions,
    /// Always break after the return type of top-level definitions.
    /// \code
    ///   class A {
    ///     int f() { return 0; };
    ///   };
    ///   int f();
    ///   int
    ///   f() {
    ///     return 1;
    ///   }
    /// \endcode
    RTBS_TopLevelDefinitions,
  };

  /// The function definition return type breaking style to use.  This
  /// option is **deprecated** and is retained for backwards compatibility.
  DefinitionReturnTypeBreakingStyle AlwaysBreakAfterDefinitionReturnType;

  /// The function declaration return type breaking style to use.
  ReturnTypeBreakingStyle AlwaysBreakAfterReturnType;

  /// If ``true``, always break before multiline string literals.
  ///
  /// This flag is mean to make cases where there are multiple multiline strings
  /// in a file look more consistent. Thus, it will only take effect if wrapping
  /// the string at that point leads to it being indented
  /// ``ContinuationIndentWidth`` spaces from the start of the line.
  /// \code
  ///    true:                                  false:
  ///    aaaa =                         vs.     aaaa = "bbbb"
  ///        "bbbb"                                    "cccc";
  ///        "cccc";
  /// \endcode
  bool AlwaysBreakBeforeMultilineStrings;

  /// Different ways to break after the template declaration.
  enum BreakTemplateDeclarationsStyle {
      /// Do not force break before declaration.
      /// ``PenaltyBreakTemplateDeclaration`` is taken into account.
      /// \code
      ///    template <typename T> T foo() {
      ///    }
      ///    template <typename T> T foo(int aaaaaaaaaaaaaaaaaaaaa,
      ///                                int bbbbbbbbbbbbbbbbbbbbb) {
      ///    }
      /// \endcode
      BTDS_No,
      /// Force break after template declaration only when the following
      /// declaration spans multiple lines.
      /// \code
      ///    template <typename T> T foo() {
      ///    }
      ///    template <typename T>
      ///    T foo(int aaaaaaaaaaaaaaaaaaaaa,
      ///          int bbbbbbbbbbbbbbbbbbbbb) {
      ///    }
      /// \endcode
      BTDS_MultiLine,
      /// Always break after template declaration.
      /// \code
      ///    template <typename T>
      ///    T foo() {
      ///    }
      ///    template <typename T>
      ///    T foo(int aaaaaaaaaaaaaaaaaaaaa,
      ///          int bbbbbbbbbbbbbbbbbbbbb) {
      ///    }
      /// \endcode
      BTDS_Yes
  };

  /// The template declaration breaking style to use.
  BreakTemplateDeclarationsStyle AlwaysBreakTemplateDeclarations;

  /// If ``false``, a function call's arguments will either be all on the
  /// same line or will have one line each.
  /// \code
  ///   true:
  ///   void f() {
  ///     f(aaaaaaaaaaaaaaaaaaaa, aaaaaaaaaaaaaaaaaaaa,
  ///       aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa);
  ///   }
  ///
  ///   false:
  ///   void f() {
  ///     f(aaaaaaaaaaaaaaaaaaaa,
  ///       aaaaaaaaaaaaaaaaaaaa,
  ///       aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa);
  ///   }
  /// \endcode
  bool BinPackArguments;

  /// If ``false``, a function declaration's or function definition's
  /// parameters will either all be on the same line or will have one line each.
  /// \code
  ///   true:
  ///   void f(int aaaaaaaaaaaaaaaaaaaa, int aaaaaaaaaaaaaaaaaaaa,
  ///          int aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa) {}
  ///
  ///   false:
  ///   void f(int aaaaaaaaaaaaaaaaaaaa,
  ///          int aaaaaaaaaaaaaaaaaaaa,
  ///          int aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa) {}
  /// \endcode
  bool BinPackParameters;

  /// The style of wrapping parameters on the same line (bin-packed) or
  /// on one line each.
  enum BinPackStyle {
    /// Automatically determine parameter bin-packing behavior.
    BPS_Auto,
    /// Always bin-pack parameters.
    BPS_Always,
    /// Never bin-pack parameters.
    BPS_Never,
  };

  /// The style of breaking before or after binary operators.
  enum BinaryOperatorStyle {
    /// Break after operators.
    /// \code
    ///    LooooooooooongType loooooooooooooooooooooongVariable =
    ///        someLooooooooooooooooongFunction();
    ///
    ///    bool value = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa +
    ///                         aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ==
    ///                     aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa &&
    ///                 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa >
    ///                     ccccccccccccccccccccccccccccccccccccccccc;
    /// \endcode
    BOS_None,
    /// Break before operators that aren't assignments.
    /// \code
    ///    LooooooooooongType loooooooooooooooooooooongVariable =
    ///        someLooooooooooooooooongFunction();
    ///
    ///    bool value = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    ///                         + aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    ///                     == aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    ///                 && aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    ///                        > ccccccccccccccccccccccccccccccccccccccccc;
    /// \endcode
    BOS_NonAssignment,
    /// Break before operators.
    /// \code
    ///    LooooooooooongType loooooooooooooooooooooongVariable
    ///        = someLooooooooooooooooongFunction();
    ///
    ///    bool value = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    ///                         + aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    ///                     == aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    ///                 && aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    ///                        > ccccccccccccccccccccccccccccccccccccccccc;
    /// \endcode
    BOS_All,
  };

  /// The way to wrap binary operators.
  BinaryOperatorStyle BreakBeforeBinaryOperators;

  /// Different ways to attach braces to their surrounding context.
  enum BraceBreakingStyle {
    /// Always attach braces to surrounding context.
    /// \code
    ///   try {
    ///     foo();
    ///   } catch () {
    ///   }
    ///   void foo() { bar(); }
    ///   class foo {};
    ///   if (foo()) {
    ///   } else {
    ///   }
    ///   enum X : int { A, B };
    /// \endcode
    BS_Attach,
    /// Like ``Attach``, but break before braces on function, namespace and
    /// class definitions.
    /// \code
    ///   try {
    ///     foo();
    ///   } catch () {
    ///   }
    ///   void foo() { bar(); }
    ///   class foo
    ///   {
    ///   };
    ///   if (foo()) {
    ///   } else {
    ///   }
    ///   enum X : int { A, B };
    /// \endcode
    BS_Linux,
    /// Like ``Attach``, but break before braces on enum, function, and record
    /// definitions.
    /// \code
    ///   try {
    ///     foo();
    ///   } catch () {
    ///   }
    ///   void foo() { bar(); }
    ///   class foo
    ///   {
    ///   };
    ///   if (foo()) {
    ///   } else {
    ///   }
    ///   enum X : int { A, B };
    /// \endcode
    BS_Mozilla,
    /// Like ``Attach``, but break before function definitions, ``catch``, and
    /// ``else``.
    /// \code
    ///   try {
    ///     foo();
    ///   } catch () {
    ///   }
    ///   void foo() { bar(); }
    ///   class foo
    ///   {
    ///   };
    ///   if (foo()) {
    ///   } else {
    ///   }
    ///   enum X : int
    ///   {
    ///     A,
    ///     B
    ///   };
    /// \endcode
    BS_Stroustrup,
    /// Always break before braces.
    /// \code
    ///   try {
    ///     foo();
    ///   }
    ///   catch () {
    ///   }
    ///   void foo() { bar(); }
    ///   class foo {
    ///   };
    ///   if (foo()) {
    ///   }
    ///   else {
    ///   }
    ///   enum X : int { A, B };
    /// \endcode
    BS_Allman,
    /// Always break before braces and add an extra level of indentation to
    /// braces of control statements, not to those of class, function
    /// or other definitions.
    /// \code
    ///   try
    ///     {
    ///       foo();
    ///     }
    ///   catch ()
    ///     {
    ///     }
    ///   void foo() { bar(); }
    ///   class foo
    ///   {
    ///   };
    ///   if (foo())
    ///     {
    ///     }
    ///   else
    ///     {
    ///     }
    ///   enum X : int
    ///   {
    ///     A,
    ///     B
    ///   };
    /// \endcode
    BS_GNU,
    /// Like ``Attach``, but break before functions.
    /// \code
    ///   try {
    ///     foo();
    ///   } catch () {
    ///   }
    ///   void foo() { bar(); }
    ///   class foo {
    ///   };
    ///   if (foo()) {
    ///   } else {
    ///   }
    ///   enum X : int { A, B };
    /// \endcode
    BS_WebKit,
    /// Configure each individual brace in `BraceWrapping`.
    BS_Custom
  };

  /// The brace breaking style to use.
  BraceBreakingStyle BreakBeforeBraces;

  /// Precise control over the wrapping of braces.
  /// \code
  ///   # Should be declared this way:
  ///   BreakBeforeBraces: Custom
  ///   BraceWrapping:
  ///       AfterClass: true
  /// \endcode
  struct BraceWrappingFlags {
    /// Wrap class definitions.
    /// \code
    ///   true:
    ///   class foo {};
    ///
    ///   false:
    ///   class foo
    ///   {};
    /// \endcode
    bool AfterClass;
    /// Wrap control statements (``if``/``for``/``while``/``switch``/..).
    /// \code
    ///   true:
    ///   if (foo())
    ///   {
    ///   } else
    ///   {}
    ///   for (int i = 0; i < 10; ++i)
    ///   {}
    ///
    ///   false:
    ///   if (foo()) {
    ///   } else {
    ///   }
    ///   for (int i = 0; i < 10; ++i) {
    ///   }
    /// \endcode
    bool AfterControlStatement;
    /// Wrap enum definitions.
    /// \code
    ///   true:
    ///   enum X : int
    ///   {
    ///     B
    ///   };
    ///
    ///   false:
    ///   enum X : int { B };
    /// \endcode
    bool AfterEnum;
    /// Wrap function definitions.
    /// \code
    ///   true:
    ///   void foo()
    ///   {
    ///     bar();
    ///     bar2();
    ///   }
    ///
    ///   false:
    ///   void foo() {
    ///     bar();
    ///     bar2();
    ///   }
    /// \endcode
    bool AfterFunction;
    /// Wrap namespace definitions.
    /// \code
    ///   true:
    ///   namespace
    ///   {
    ///   int foo();
    ///   int bar();
    ///   }
    ///
    ///   false:
    ///   namespace {
    ///   int foo();
    ///   int bar();
    ///   }
    /// \endcode
    bool AfterNamespace;
    /// Wrap ObjC definitions (interfaces, implementations...).
    /// \note @autoreleasepool and @synchronized blocks are wrapped
    /// according to `AfterControlStatement` flag.
    bool AfterObjCDeclaration;
    /// Wrap struct definitions.
    /// \code
    ///   true:
    ///   struct foo
    ///   {
    ///     int x;
    ///   };
    ///
    ///   false:
    ///   struct foo {
    ///     int x;
    ///   };
    /// \endcode
    bool AfterStruct;
    /// Wrap union definitions.
    /// \code
    ///   true:
    ///   union foo
    ///   {
    ///     int x;
    ///   }
    ///
    ///   false:
    ///   union foo {
    ///     int x;
    ///   }
    /// \endcode
    bool AfterUnion;
    /// Wrap extern blocks.
    /// \code
    ///   true:
    ///   extern "C"
    ///   {
    ///     int foo();
    ///   }
    ///
    ///   false:
    ///   extern "C" {
    ///   int foo();
    ///   }
    /// \endcode
    bool AfterExternBlock;
    /// Wrap before ``catch``.
    /// \code
    ///   true:
    ///   try {
    ///     foo();
    ///   }
    ///   catch () {
    ///   }
    ///
    ///   false:
    ///   try {
    ///     foo();
    ///   } catch () {
    ///   }
    /// \endcode
    bool BeforeCatch;
    /// Wrap before ``else``.
    /// \code
    ///   true:
    ///   if (foo()) {
    ///   }
    ///   else {
    ///   }
    ///
    ///   false:
    ///   if (foo()) {
    ///   } else {
    ///   }
    /// \endcode
    bool BeforeElse;
    /// Indent the wrapped braces themselves.
    bool IndentBraces;
    /// If ``false``, empty function body can be put on a single line.
    /// This option is used only if the opening brace of the function has
    /// already been wrapped, i.e. the `AfterFunction` brace wrapping mode is
    /// set, and the function could/should not be put on a single line (as per
    /// `AllowShortFunctionsOnASingleLine` and constructor formatting options).
    /// \code
    ///   int f()   vs.   inf f()
    ///   {}              {
    ///                   }
    /// \endcode
    ///
    bool SplitEmptyFunction;
    /// If ``false``, empty record (e.g. class, struct or union) body
    /// can be put on a single line. This option is used only if the opening
    /// brace of the record has already been wrapped, i.e. the `AfterClass`
    /// (for classes) brace wrapping mode is set.
    /// \code
    ///   class Foo   vs.  class Foo
    ///   {}               {
    ///                    }
    /// \endcode
    ///
    bool SplitEmptyRecord;
    /// If ``false``, empty namespace body can be put on a single line.
    /// This option is used only if the opening brace of the namespace has
    /// already been wrapped, i.e. the `AfterNamespace` brace wrapping mode is
    /// set.
    /// \code
    ///   namespace Foo   vs.  namespace Foo
    ///   {}                   {
    ///                        }
    /// \endcode
    ///
    bool SplitEmptyNamespace;
  };

  /// Control of individual brace wrapping cases.
  ///
  /// If ``BreakBeforeBraces`` is set to ``BS_Custom``, use this to specify how
  /// each individual brace case should be handled. Otherwise, this is ignored.
  /// \code{.yaml}
  ///   # Example of usage:
  ///   BreakBeforeBraces: Custom
  ///   BraceWrapping:
  ///     AfterEnum: true
  ///     AfterStruct: false
  ///     SplitEmptyFunction: false
  /// \endcode
  BraceWrappingFlags BraceWrapping;

  /// If ``true``, ternary operators will be placed after line breaks.
  /// \code
  ///    true:
  ///    veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongDescription
  ///        ? firstValue
  ///        : SecondValueVeryVeryVeryVeryLong;
  ///
  ///    false:
  ///    veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongDescription ?
  ///        firstValue :
  ///        SecondValueVeryVeryVeryVeryLong;
  /// \endcode
  bool BreakBeforeTernaryOperators;

  /// Different ways to break initializers.
  enum BreakConstructorInitializersStyle {
    /// Break constructor initializers before the colon and after the commas.
    /// \code
    ///    Constructor()
    ///        : initializer1(),
    ///          initializer2()
    /// \endcode
    BCIS_BeforeColon,
    /// Break constructor initializers before the colon and commas, and align
    /// the commas with the colon.
    /// \code
    ///    Constructor()
    ///        : initializer1()
    ///        , initializer2()
    /// \endcode
    BCIS_BeforeComma,
    /// Break constructor initializers after the colon and commas.
    /// \code
    ///    Constructor() :
    ///        initializer1(),
    ///        initializer2()
    /// \endcode
    BCIS_AfterColon
  };

  /// The constructor initializers style to use.
  BreakConstructorInitializersStyle BreakConstructorInitializers;

  /// Break after each annotation on a field in Java files.
  /// \code{.java}
  ///    true:                                  false:
  ///    @Partial                       vs.     @Partial @Mock DataLoad loader;
  ///    @Mock
  ///    DataLoad loader;
  /// \endcode
  bool BreakAfterJavaFieldAnnotations;

  /// Allow breaking string literals when formatting.
  bool BreakStringLiterals;

  /// The column limit.
  ///
  /// A column limit of ``0`` means that there is no column limit. In this case,
  /// clang-format will respect the input's line breaking decisions within
  /// statements unless they contradict other rules.
  unsigned ColumnLimit;

  /// A regular expression that describes comments with special meaning,
  /// which should not be split into lines or otherwise changed.
  /// \code
  ///    // CommentPragmas: '^ FOOBAR pragma:'
  ///    // Will leave the following line unaffected
  ///    #include <vector> // FOOBAR pragma: keep
  /// \endcode
  std::string CommentPragmas;

  /// Different ways to break inheritance list.
  enum BreakInheritanceListStyle {
    /// Break inheritance list before the colon and after the commas.
    /// \code
    ///    class Foo
    ///        : Base1,
    ///          Base2
    ///    {};
    /// \endcode
    BILS_BeforeColon,
    /// Break inheritance list before the colon and commas, and align
    /// the commas with the colon.
    /// \code
    ///    class Foo
    ///        : Base1
    ///        , Base2
    ///    {};
    /// \endcode
    BILS_BeforeComma,
    /// Break inheritance list after the colon and commas.
    /// \code
    ///    class Foo :
    ///        Base1,
    ///        Base2
    ///    {};
    /// \endcode
    BILS_AfterColon
  };

  /// The inheritance list style to use.
  BreakInheritanceListStyle BreakInheritanceList;

  /// If ``true``, consecutive namespace declarations will be on the same
  /// line. If ``false``, each namespace is declared on a new line.
  /// \code
  ///   true:
  ///   namespace Foo { namespace Bar {
  ///   }}
  ///
  ///   false:
  ///   namespace Foo {
  ///   namespace Bar {
  ///   }
  ///   }
  /// \endcode
  ///
  /// If it does not fit on a single line, the overflowing namespaces get
  /// wrapped:
  /// \code
  ///   namespace Foo { namespace Bar {
  ///   namespace Extra {
  ///   }}}
  /// \endcode
  bool CompactNamespaces;

  /// If the constructor initializers don't fit on a line, put each
  /// initializer on its own line.
  /// \code
  ///   true:
  ///   SomeClass::Constructor()
  ///       : aaaaaaaa(aaaaaaaa), aaaaaaaa(aaaaaaaa), aaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaa) {
  ///     return 0;
  ///   }
  ///
  ///   false:
  ///   SomeClass::Constructor()
  ///       : aaaaaaaa(aaaaaaaa), aaaaaaaa(aaaaaaaa),
  ///         aaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaa) {
  ///     return 0;
  ///   }
  /// \endcode
  bool ConstructorInitializerAllOnOneLineOrOnePerLine;

  /// The number of characters to use for indentation of constructor
  /// initializer lists as well as inheritance lists.
  unsigned ConstructorInitializerIndentWidth;

  /// Indent width for line continuations.
  /// \code
  ///    ContinuationIndentWidth: 2
  ///
  ///    int i =         //  VeryVeryVeryVeryVeryLongComment
  ///      longFunction( // Again a long comment
  ///        arg);
  /// \endcode
  unsigned ContinuationIndentWidth;

  /// If ``true``, format braced lists as best suited for C++11 braced
  /// lists.
  ///
  /// Important differences:
  /// - No spaces inside the braced list.
  /// - No line break before the closing brace.
  /// - Indentation with the continuation indent, not with the block indent.
  ///
  /// Fundamentally, C++11 braced lists are formatted exactly like function
  /// calls would be formatted in their place. If the braced list follows a name
  /// (e.g. a type or variable name), clang-format formats as if the ``{}`` were
  /// the parentheses of a function call with that name. If there is no name,
  /// a zero-length name is assumed.
  /// \code
  ///    true:                                  false:
  ///    vector<int> x{1, 2, 3, 4};     vs.     vector<int> x{ 1, 2, 3, 4 };
  ///    vector<T> x{{}, {}, {}, {}};           vector<T> x{ {}, {}, {}, {} };
  ///    f(MyMap[{composite, key}]);            f(MyMap[{ composite, key }]);
  ///    new int[3]{1, 2, 3};                   new int[3]{ 1, 2, 3 };
  /// \endcode
  bool Cpp11BracedListStyle;

  /// If ``true``, analyze the formatted file for the most common
  /// alignment of ``&`` and ``*``.
  /// Pointer and reference alignment styles are going to be updated according
  /// to the preferences found in the file.
  /// ``PointerAlignment`` is then used only as fallback.
  bool DerivePointerAlignment;

  /// Disables formatting completely.
  bool DisableFormat;

  /// If ``true``, clang-format detects whether function calls and
  /// definitions are formatted with one parameter per line.
  ///
  /// Each call can be bin-packed, one-per-line or inconclusive. If it is
  /// inconclusive, e.g. completely on one line, but a decision needs to be
  /// made, clang-format analyzes whether there are other bin-packed cases in
  /// the input file and act accordingly.
  ///
  /// NOTE: This is an experimental flag, that might go away or be renamed. Do
  /// not use this in config files, etc. Use at your own risk.
  bool ExperimentalAutoDetectBinPacking;

  /// If ``true``, clang-format adds missing namespace end comments and
  /// fixes invalid existing ones.
  /// \code
  ///    true:                                  false:
  ///    namespace a {                  vs.     namespace a {
  ///    foo();                                 foo();
  ///    } // namespace a;                      }
  /// \endcode
  bool FixNamespaceComments;

  /// A vector of macros that should be interpreted as foreach loops
  /// instead of as function calls.
  ///
  /// These are expected to be macros of the form:
  /// \code
  ///   FOREACH(<variable-declaration>, ...)
  ///     <loop-body>
  /// \endcode
  ///
  /// In the .clang-format configuration file, this can be configured like:
  /// \code{.yaml}
  ///   ForEachMacros: ['RANGES_FOR', 'FOREACH']
  /// \endcode
  ///
  /// For example: BOOST_FOREACH.
  std::vector<std::string> ForEachMacros;

  tooling::IncludeStyle IncludeStyle;

  /// Indent case labels one level from the switch statement.
  ///
  /// When ``false``, use the same indentation level as for the switch statement.
  /// Switch statement body is always indented one level more than case labels.
  /// \code
  ///    false:                                 true:
  ///    switch (fool) {                vs.     switch (fool) {
  ///    case 1:                                  case 1:
  ///      bar();                                   bar();
  ///      break;                                   break;
  ///    default:                                 default:
  ///      plop();                                  plop();
  ///    }                                      }
  /// \endcode
  bool IndentCaseLabels;

  /// Options for indenting preprocessor directives.
  enum PPDirectiveIndentStyle {
    /// Does not indent any directives.
    /// \code
    ///    #if FOO
    ///    #if BAR
    ///    #include <foo>
    ///    #endif
    ///    #endif
    /// \endcode
    PPDIS_None,
    /// Indents directives after the hash.
    /// \code
    ///    #if FOO
    ///    #  if BAR
    ///    #    include <foo>
    ///    #  endif
    ///    #endif
    /// \endcode
    PPDIS_AfterHash
  };

  /// The preprocessor directive indenting style to use.
  PPDirectiveIndentStyle IndentPPDirectives;

  /// The number of columns to use for indentation.
  /// \code
  ///    IndentWidth: 3
  ///
  ///    void f() {
  ///       someFunction();
  ///       if (true, false) {
  ///          f();
  ///       }
  ///    }
  /// \endcode
  unsigned IndentWidth;

  /// Indent if a function definition or declaration is wrapped after the
  /// type.
  /// \code
  ///    true:
  ///    LoooooooooooooooooooooooooooooooooooooooongReturnType
  ///        LoooooooooooooooooooooooooooooooongFunctionDeclaration();
  ///
  ///    false:
  ///    LoooooooooooooooooooooooooooooooooooooooongReturnType
  ///    LoooooooooooooooooooooooooooooooongFunctionDeclaration();
  /// \endcode
  bool IndentWrappedFunctionNames;

  /// Quotation styles for JavaScript strings. Does not affect template
  /// strings.
  enum JavaScriptQuoteStyle {
    /// Leave string quotes as they are.
    /// \code{.js}
    ///    string1 = "foo";
    ///    string2 = 'bar';
    /// \endcode
    JSQS_Leave,
    /// Always use single quotes.
    /// \code{.js}
    ///    string1 = 'foo';
    ///    string2 = 'bar';
    /// \endcode
    JSQS_Single,
    /// Always use double quotes.
    /// \code{.js}
    ///    string1 = "foo";
    ///    string2 = "bar";
    /// \endcode
    JSQS_Double
  };

  /// The JavaScriptQuoteStyle to use for JavaScript strings.
  JavaScriptQuoteStyle JavaScriptQuotes;

  /// Whether to wrap JavaScript import/export statements.
  /// \code{.js}
  ///    true:
  ///    import {
  ///        VeryLongImportsAreAnnoying,
  ///        VeryLongImportsAreAnnoying,
  ///        VeryLongImportsAreAnnoying,
  ///    } from 'some/module.js'
  ///
  ///    false:
  ///    import {VeryLongImportsAreAnnoying, VeryLongImportsAreAnnoying, VeryLongImportsAreAnnoying,} from "some/module.js"
  /// \endcode
  bool JavaScriptWrapImports;

  /// If true, the empty line at the start of blocks is kept.
  /// \code
  ///    true:                                  false:
  ///    if (foo) {                     vs.     if (foo) {
  ///                                             bar();
  ///      bar();                               }
  ///    }
  /// \endcode
  bool KeepEmptyLinesAtTheStartOfBlocks;

  /// Supported languages.
  ///
  /// When stored in a configuration file, specifies the language, that the
  /// configuration targets. When passed to the ``reformat()`` function, enables
  /// syntax features specific to the language.
  enum LanguageKind {
    /// Do not use.
    LK_None,
    /// Should be used for C, C++.
    LK_Cpp,
    /// Should be used for Java.
    LK_Java,
    /// Should be used for JavaScript.
    LK_JavaScript,
    /// Should be used for Objective-C, Objective-C++.
    LK_ObjC,
    /// Should be used for Protocol Buffers
    /// (https://developers.google.com/protocol-buffers/).
    LK_Proto,
    /// Should be used for TableGen code.
    LK_TableGen,
    /// Should be used for Protocol Buffer messages in text format
    /// (https://developers.google.com/protocol-buffers/).
    LK_TextProto
  };
  bool isCpp() const { return Language == LK_Cpp || Language == LK_ObjC; }

  /// Language, this format style is targeted at.
  LanguageKind Language;

  /// A regular expression matching macros that start a block.
  /// \code
  ///    # With:
  ///    MacroBlockBegin: "^NS_MAP_BEGIN|\
  ///    NS_TABLE_HEAD$"
  ///    MacroBlockEnd: "^\
  ///    NS_MAP_END|\
  ///    NS_TABLE_.*_END$"
  ///
  ///    NS_MAP_BEGIN
  ///      foo();
  ///    NS_MAP_END
  ///
  ///    NS_TABLE_HEAD
  ///      bar();
  ///    NS_TABLE_FOO_END
  ///
  ///    # Without:
  ///    NS_MAP_BEGIN
  ///    foo();
  ///    NS_MAP_END
  ///
  ///    NS_TABLE_HEAD
  ///    bar();
  ///    NS_TABLE_FOO_END
  /// \endcode
  std::string MacroBlockBegin;

  /// A regular expression matching macros that end a block.
  std::string MacroBlockEnd;

  /// The maximum number of consecutive empty lines to keep.
  /// \code
  ///    MaxEmptyLinesToKeep: 1         vs.     MaxEmptyLinesToKeep: 0
  ///    int f() {                              int f() {
  ///      int = 1;                                 int i = 1;
  ///                                               i = foo();
  ///      i = foo();                               return i;
  ///                                           }
  ///      return i;
  ///    }
  /// \endcode
  unsigned MaxEmptyLinesToKeep;

  /// Different ways to indent namespace contents.
  enum NamespaceIndentationKind {
    /// Don't indent in namespaces.
    /// \code
    ///    namespace out {
    ///    int i;
    ///    namespace in {
    ///    int i;
    ///    }
    ///    }
    /// \endcode
    NI_None,
    /// Indent only in inner namespaces (nested in other namespaces).
    /// \code
    ///    namespace out {
    ///    int i;
    ///    namespace in {
    ///      int i;
    ///    }
    ///    }
    /// \endcode
    NI_Inner,
    /// Indent in all namespaces.
    /// \code
    ///    namespace out {
    ///      int i;
    ///      namespace in {
    ///        int i;
    ///      }
    ///    }
    /// \endcode
    NI_All
  };

  /// The indentation used for namespaces.
  NamespaceIndentationKind NamespaceIndentation;

  /// Controls bin-packing Objective-C protocol conformance list
  /// items into as few lines as possible when they go over ``ColumnLimit``.
  ///
  /// If ``Auto`` (the default), delegates to the value in
  /// ``BinPackParameters``. If that is ``true``, bin-packs Objective-C
  /// protocol conformance list items into as few lines as possible
  /// whenever they go over ``ColumnLimit``.
  ///
  /// If ``Always``, always bin-packs Objective-C protocol conformance
  /// list items into as few lines as possible whenever they go over
  /// ``ColumnLimit``.
  ///
  /// If ``Never``, lays out Objective-C protocol conformance list items
  /// onto individual lines whenever they go over ``ColumnLimit``.
  ///
  /// \code{.objc}
  ///    Always (or Auto, if BinPackParameters=true):
  ///    @interface ccccccccccccc () <
  ///        ccccccccccccc, ccccccccccccc,
  ///        ccccccccccccc, ccccccccccccc> {
  ///    }
  ///
  ///    Never (or Auto, if BinPackParameters=false):
  ///    @interface ddddddddddddd () <
  ///        ddddddddddddd,
  ///        ddddddddddddd,
  ///        ddddddddddddd,
  ///        ddddddddddddd> {
  ///    }
  /// \endcode
  BinPackStyle ObjCBinPackProtocolList;

  /// The number of characters to use for indentation of ObjC blocks.
  /// \code{.objc}
  ///    ObjCBlockIndentWidth: 4
  ///
  ///    [operation setCompletionBlock:^{
  ///        [self onOperationDone];
  ///    }];
  /// \endcode
  unsigned ObjCBlockIndentWidth;

  /// Add a space after ``@property`` in Objective-C, i.e. use
  /// ``@property (readonly)`` instead of ``@property(readonly)``.
  bool ObjCSpaceAfterProperty;

  /// Add a space in front of an Objective-C protocol list, i.e. use
  /// ``Foo <Protocol>`` instead of ``Foo<Protocol>``.
  bool ObjCSpaceBeforeProtocolList;

  /// The penalty for breaking around an assignment operator.
  unsigned PenaltyBreakAssignment;

  /// The penalty for breaking a function call after ``call(``.
  unsigned PenaltyBreakBeforeFirstCallParameter;

  /// The penalty for each line break introduced inside a comment.
  unsigned PenaltyBreakComment;

  /// The penalty for breaking before the first ``<<``.
  unsigned PenaltyBreakFirstLessLess;

  /// The penalty for each line break introduced inside a string literal.
  unsigned PenaltyBreakString;

  /// The penalty for breaking after template declaration.
  unsigned PenaltyBreakTemplateDeclaration;

  /// The penalty for each character outside of the column limit.
  unsigned PenaltyExcessCharacter;

  /// Penalty for putting the return type of a function onto its own
  /// line.
  unsigned PenaltyReturnTypeOnItsOwnLine;

  /// The ``&`` and ``*`` alignment style.
  enum PointerAlignmentStyle {
    /// Align pointer to the left.
    /// \code
    ///   int* a;
    /// \endcode
    PAS_Left,
    /// Align pointer to the right.
    /// \code
    ///   int *a;
    /// \endcode
    PAS_Right,
    /// Align pointer in the middle.
    /// \code
    ///   int * a;
    /// \endcode
    PAS_Middle
  };

  /// Pointer and reference alignment style.
  PointerAlignmentStyle PointerAlignment;

  /// See documentation of ``RawStringFormats``.
  struct RawStringFormat {
    /// The language of this raw string.
    LanguageKind Language;
    /// A list of raw string delimiters that match this language.
    std::vector<std::string> Delimiters;
    /// A list of enclosing function names that match this language.
    std::vector<std::string> EnclosingFunctions;
    /// The canonical delimiter for this language.
    std::string CanonicalDelimiter;
    /// The style name on which this raw string format is based on.
    /// If not specified, the raw string format is based on the style that this
    /// format is based on.
    std::string BasedOnStyle;
    bool operator==(const RawStringFormat &Other) const {
      return Language == Other.Language && Delimiters == Other.Delimiters &&
             EnclosingFunctions == Other.EnclosingFunctions &&
             CanonicalDelimiter == Other.CanonicalDelimiter &&
             BasedOnStyle == Other.BasedOnStyle;
    }
  };

  /// Defines hints for detecting supported languages code blocks in raw
  /// strings.
  ///
  /// A raw string with a matching delimiter or a matching enclosing function
  /// name will be reformatted assuming the specified language based on the
  /// style for that language defined in the .clang-format file. If no style has
  /// been defined in the .clang-format file for the specific language, a
  /// predefined style given by 'BasedOnStyle' is used. If 'BasedOnStyle' is not
  /// found, the formatting is based on llvm style. A matching delimiter takes
  /// precedence over a matching enclosing function name for determining the
  /// language of the raw string contents.
  ///
  /// If a canonical delimiter is specified, occurrences of other delimiters for
  /// the same language will be updated to the canonical if possible.
  ///
  /// There should be at most one specification per language and each delimiter
  /// and enclosing function should not occur in multiple specifications.
  ///
  /// To configure this in the .clang-format file, use:
  /// \code{.yaml}
  ///   RawStringFormats:
  ///     - Language: TextProto
  ///         Delimiters:
  ///           - 'pb'
  ///           - 'proto'
  ///         EnclosingFunctions:
  ///           - 'PARSE_TEXT_PROTO'
  ///         BasedOnStyle: google
  ///     - Language: Cpp
  ///         Delimiters:
  ///           - 'cc'
  ///           - 'cpp'
  ///         BasedOnStyle: llvm
  ///         CanonicalDelimiter: 'cc'
  /// \endcode
  std::vector<RawStringFormat> RawStringFormats;

  /// If ``true``, clang-format will attempt to re-flow comments.
  /// \code
  ///    false:
  ///    // veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongComment with plenty of information
  ///    /* second veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongComment with plenty of information */
  ///
  ///    true:
  ///    // veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongComment with plenty of
  ///    // information
  ///    /* second veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongComment with plenty of
  ///     * information */
  /// \endcode
  bool ReflowComments;

  /// If ``true``, clang-format will sort ``#includes``.
  /// \code
  ///    false:                                 true:
  ///    #include "b.h"                 vs.     #include "a.h"
  ///    #include "a.h"                         #include "b.h"
  /// \endcode
  bool SortIncludes;

  /// If ``true``, clang-format will sort using declarations.
  ///
  /// The order of using declarations is defined as follows:
  /// Split the strings by "::" and discard any initial empty strings. The last
  /// element of each list is a non-namespace name; all others are namespace
  /// names. Sort the lists of names lexicographically, where the sort order of
  /// individual names is that all non-namespace names come before all namespace
  /// names, and within those groups, names are in case-insensitive
  /// lexicographic order.
  /// \code
  ///    false:                                 true:
  ///    using std::cout;               vs.     using std::cin;
  ///    using std::cin;                        using std::cout;
  /// \endcode
  bool SortUsingDeclarations;

  /// If ``true``, a space is inserted after C style casts.
  /// \code
  ///    true:                                  false:
  ///    (int) i;                       vs.     (int)i;
  /// \endcode
  bool SpaceAfterCStyleCast;

  /// If \c true, a space will be inserted after the 'template' keyword.
  /// \code
  ///    true:                                  false:
  ///    template <int> void foo();     vs.     template<int> void foo();
  /// \endcode
  bool SpaceAfterTemplateKeyword;

  /// If ``false``, spaces will be removed before assignment operators.
  /// \code
  ///    true:                                  false:
  ///    int a = 5;                     vs.     int a=5;
  ///    a += 42                                a+=42;
  /// \endcode
  bool SpaceBeforeAssignmentOperators;

  /// If ``true``, a space will be inserted before a C++11 braced list
  /// used to initialize an object (after the preceding identifier or type).
  /// \code
  ///    true:                                  false:
  ///    Foo foo { bar };               vs.     Foo foo{ bar };
  ///    Foo {};                                Foo{};
  ///    vector<int> { 1, 2, 3 };               vector<int>{ 1, 2, 3 };
  ///    new int[3] { 1, 2, 3 };                new int[3]{ 1, 2, 3 };
  /// \endcode
  bool SpaceBeforeCpp11BracedList;

  /// If ``false``, spaces will be removed before constructor initializer
  /// colon.
  /// \code
  ///    true:                                  false:
  ///    Foo::Foo() : a(a) {}                   Foo::Foo(): a(a) {}
  /// \endcode
  bool SpaceBeforeCtorInitializerColon;

  /// If ``false``, spaces will be removed before inheritance colon.
  /// \code
  ///    true:                                  false:
  ///    class Foo : Bar {}             vs.     class Foo: Bar {}
  /// \endcode
  bool SpaceBeforeInheritanceColon;

  /// Different ways to put a space before opening parentheses.
  enum SpaceBeforeParensOptions {
    /// Never put a space before opening parentheses.
    /// \code
    ///    void f() {
    ///      if(true) {
    ///        f();
    ///      }
    ///    }
    /// \endcode
    SBPO_Never,
    /// Put a space before opening parentheses only after control statement
    /// keywords (``for/if/while...``).
    /// \code
    ///    void f() {
    ///      if (true) {
    ///        f();
    ///      }
    ///    }
    /// \endcode
    SBPO_ControlStatements,
    /// Always put a space before opening parentheses, except when it's
    /// prohibited by the syntax rules (in function-like macro definitions) or
    /// when determined by other style rules (after unary operators, opening
    /// parentheses, etc.)
    /// \code
    ///    void f () {
    ///      if (true) {
    ///        f ();
    ///      }
    ///    }
    /// \endcode
    SBPO_Always
  };

  /// Defines in which cases to put a space before opening parentheses.
  SpaceBeforeParensOptions SpaceBeforeParens;

  /// If ``false``, spaces will be removed before range-based for loop
  /// colon.
  /// \code
  ///    true:                                  false:
  ///    for (auto v : values) {}       vs.     for(auto v: values) {}
  /// \endcode
  bool SpaceBeforeRangeBasedForLoopColon;

  /// If ``true``, spaces may be inserted into ``()``.
  /// \code
  ///    true:                                false:
  ///    void f( ) {                    vs.   void f() {
  ///      int x[] = {foo( ), bar( )};          int x[] = {foo(), bar()};
  ///      if (true) {                          if (true) {
  ///        f( );                                f();
  ///      }                                    }
  ///    }                                    }
  /// \endcode
  bool SpaceInEmptyParentheses;

  /// The number of spaces before trailing line comments
  /// (``//`` - comments).
  ///
  /// This does not affect trailing block comments (``/*`` - comments) as
  /// those commonly have different usage patterns and a number of special
  /// cases.
  /// \code
  ///    SpacesBeforeTrailingComments: 3
  ///    void f() {
  ///      if (true) {   // foo1
  ///        f();        // bar
  ///      }             // foo
  ///    }
  /// \endcode
  unsigned SpacesBeforeTrailingComments;

  /// If ``true``, spaces will be inserted after ``<`` and before ``>``
  /// in template argument lists.
  /// \code
  ///    true:                                  false:
  ///    static_cast< int >(arg);       vs.     static_cast<int>(arg);
  ///    std::function< void(int) > fct;        std::function<void(int)> fct;
  /// \endcode
  bool SpacesInAngles;

  /// If ``true``, spaces are inserted inside container literals (e.g.
  /// ObjC and Javascript array and dict literals).
  /// \code{.js}
  ///    true:                                  false:
  ///    var arr = [ 1, 2, 3 ];         vs.     var arr = [1, 2, 3];
  ///    f({a : 1, b : 2, c : 3});              f({a: 1, b: 2, c: 3});
  /// \endcode
  bool SpacesInContainerLiterals;

  /// If ``true``, spaces may be inserted into C style casts.
  /// \code
  ///    true:                                  false:
  ///    x = ( int32 )y                 vs.     x = (int32)y
  /// \endcode
  bool SpacesInCStyleCastParentheses;

  /// If ``true``, spaces will be inserted after ``(`` and before ``)``.
  /// \code
  ///    true:                                  false:
  ///    t f( Deleted & ) & = delete;   vs.     t f(Deleted &) & = delete;
  /// \endcode
  bool SpacesInParentheses;

  /// If ``true``, spaces will be inserted after ``[`` and before ``]``.
  /// Lambdas or unspecified size array declarations will not be affected.
  /// \code
  ///    true:                                  false:
  ///    int a[ 5 ];                    vs.     int a[5];
  ///    std::unique_ptr<int[]> foo() {} // Won't be affected
  /// \endcode
  bool SpacesInSquareBrackets;

  /// Supported language standards.
  enum LanguageStandard {
    /// Use C++03-compatible syntax.
    LS_Cpp03,
    /// Use features of C++11, C++14 and C++1z (e.g. ``A<A<int>>`` instead of
    /// ``A<A<int> >``).
    LS_Cpp11,
    /// Automatic detection based on the input.
    LS_Auto
  };

  /// Format compatible with this standard, e.g. use ``A<A<int> >``
  /// instead of ``A<A<int>>`` for ``LS_Cpp03``.
  LanguageStandard Standard;

  /// The number of columns used for tab stops.
  unsigned TabWidth;

  /// Different ways to use tab in formatting.
  enum UseTabStyle {
    /// Never use tab.
    UT_Never,
    /// Use tabs only for indentation.
    UT_ForIndentation,
    /// Use tabs only for line continuation and indentation.
    UT_ForContinuationAndIndentation,
    /// Use tabs whenever we need to fill whitespace that spans at least from
    /// one tab stop to the next one.
    UT_Always
  };

  /// The way to use tab characters in the resulting file.
  UseTabStyle UseTab;

  bool operator==(const FormatStyle &R) const {
    return AccessModifierOffset == R.AccessModifierOffset &&
           AlignAfterOpenBracket == R.AlignAfterOpenBracket &&
           AlignConsecutiveAssignments == R.AlignConsecutiveAssignments &&
           AlignConsecutiveDeclarations == R.AlignConsecutiveDeclarations &&
           AlignEscapedNewlines == R.AlignEscapedNewlines &&
           AlignOperands == R.AlignOperands &&
           AlignTrailingComments == R.AlignTrailingComments &&
           AllowAllParametersOfDeclarationOnNextLine ==
               R.AllowAllParametersOfDeclarationOnNextLine &&
           AllowShortBlocksOnASingleLine == R.AllowShortBlocksOnASingleLine &&
           AllowShortCaseLabelsOnASingleLine ==
               R.AllowShortCaseLabelsOnASingleLine &&
           AllowShortFunctionsOnASingleLine ==
               R.AllowShortFunctionsOnASingleLine &&
           AllowShortIfStatementsOnASingleLine ==
               R.AllowShortIfStatementsOnASingleLine &&
           AllowShortLoopsOnASingleLine == R.AllowShortLoopsOnASingleLine &&
           AlwaysBreakAfterReturnType == R.AlwaysBreakAfterReturnType &&
           AlwaysBreakBeforeMultilineStrings ==
               R.AlwaysBreakBeforeMultilineStrings &&
           AlwaysBreakTemplateDeclarations ==
               R.AlwaysBreakTemplateDeclarations &&
           BinPackArguments == R.BinPackArguments &&
           BinPackParameters == R.BinPackParameters &&
           BreakBeforeBinaryOperators == R.BreakBeforeBinaryOperators &&
           BreakBeforeBraces == R.BreakBeforeBraces &&
           BreakBeforeTernaryOperators == R.BreakBeforeTernaryOperators &&
           BreakConstructorInitializers == R.BreakConstructorInitializers &&
           CompactNamespaces == R.CompactNamespaces &&
           BreakAfterJavaFieldAnnotations == R.BreakAfterJavaFieldAnnotations &&
           BreakStringLiterals == R.BreakStringLiterals &&
           ColumnLimit == R.ColumnLimit && CommentPragmas == R.CommentPragmas &&
           BreakInheritanceList == R.BreakInheritanceList &&
           ConstructorInitializerAllOnOneLineOrOnePerLine ==
               R.ConstructorInitializerAllOnOneLineOrOnePerLine &&
           ConstructorInitializerIndentWidth ==
               R.ConstructorInitializerIndentWidth &&
           ContinuationIndentWidth == R.ContinuationIndentWidth &&
           Cpp11BracedListStyle == R.Cpp11BracedListStyle &&
           DerivePointerAlignment == R.DerivePointerAlignment &&
           DisableFormat == R.DisableFormat &&
           ExperimentalAutoDetectBinPacking ==
               R.ExperimentalAutoDetectBinPacking &&
           FixNamespaceComments == R.FixNamespaceComments &&
           ForEachMacros == R.ForEachMacros &&
           IncludeStyle.IncludeBlocks == R.IncludeStyle.IncludeBlocks &&
           IncludeStyle.IncludeCategories == R.IncludeStyle.IncludeCategories &&
           IndentCaseLabels == R.IndentCaseLabels &&
           IndentPPDirectives == R.IndentPPDirectives &&
           IndentWidth == R.IndentWidth && Language == R.Language &&
           IndentWrappedFunctionNames == R.IndentWrappedFunctionNames &&
           JavaScriptQuotes == R.JavaScriptQuotes &&
           JavaScriptWrapImports == R.JavaScriptWrapImports &&
           KeepEmptyLinesAtTheStartOfBlocks ==
               R.KeepEmptyLinesAtTheStartOfBlocks &&
           MacroBlockBegin == R.MacroBlockBegin &&
           MacroBlockEnd == R.MacroBlockEnd &&
           MaxEmptyLinesToKeep == R.MaxEmptyLinesToKeep &&
           NamespaceIndentation == R.NamespaceIndentation &&
           ObjCBinPackProtocolList == R.ObjCBinPackProtocolList &&
           ObjCBlockIndentWidth == R.ObjCBlockIndentWidth &&
           ObjCSpaceAfterProperty == R.ObjCSpaceAfterProperty &&
           ObjCSpaceBeforeProtocolList == R.ObjCSpaceBeforeProtocolList &&
           PenaltyBreakAssignment == R.PenaltyBreakAssignment &&
           PenaltyBreakBeforeFirstCallParameter ==
               R.PenaltyBreakBeforeFirstCallParameter &&
           PenaltyBreakComment == R.PenaltyBreakComment &&
           PenaltyBreakFirstLessLess == R.PenaltyBreakFirstLessLess &&
           PenaltyBreakString == R.PenaltyBreakString &&
           PenaltyExcessCharacter == R.PenaltyExcessCharacter &&
           PenaltyReturnTypeOnItsOwnLine == R.PenaltyReturnTypeOnItsOwnLine &&
           PenaltyBreakTemplateDeclaration ==
               R.PenaltyBreakTemplateDeclaration &&
           PointerAlignment == R.PointerAlignment &&
           RawStringFormats == R.RawStringFormats &&
           SpaceAfterCStyleCast == R.SpaceAfterCStyleCast &&
           SpaceAfterTemplateKeyword == R.SpaceAfterTemplateKeyword &&
           SpaceBeforeAssignmentOperators == R.SpaceBeforeAssignmentOperators &&
           SpaceBeforeCpp11BracedList == R.SpaceBeforeCpp11BracedList &&
           SpaceBeforeCtorInitializerColon ==
               R.SpaceBeforeCtorInitializerColon &&
           SpaceBeforeInheritanceColon == R.SpaceBeforeInheritanceColon &&
           SpaceBeforeParens == R.SpaceBeforeParens &&
           SpaceBeforeRangeBasedForLoopColon ==
               R.SpaceBeforeRangeBasedForLoopColon &&
           SpaceInEmptyParentheses == R.SpaceInEmptyParentheses &&
           SpacesBeforeTrailingComments == R.SpacesBeforeTrailingComments &&
           SpacesInAngles == R.SpacesInAngles &&
           SpacesInContainerLiterals == R.SpacesInContainerLiterals &&
           SpacesInCStyleCastParentheses == R.SpacesInCStyleCastParentheses &&
           SpacesInParentheses == R.SpacesInParentheses &&
           SpacesInSquareBrackets == R.SpacesInSquareBrackets &&
           Standard == R.Standard && TabWidth == R.TabWidth &&
           UseTab == R.UseTab;
  }

  llvm::Optional<FormatStyle> GetLanguageStyle(LanguageKind Language) const;

  // Stores per-language styles. A FormatStyle instance inside has an empty
  // StyleSet. A FormatStyle instance returned by the Get method has its
  // StyleSet set to a copy of the originating StyleSet, effectively keeping the
  // internal representation of that StyleSet alive.
  //
  // The memory management and ownership reminds of a birds nest: chicks
  // leaving the nest take photos of the nest with them.
  struct FormatStyleSet {
    typedef std::map<FormatStyle::LanguageKind, FormatStyle> MapType;

    llvm::Optional<FormatStyle> Get(FormatStyle::LanguageKind Language) const;

    // Adds \p Style to this FormatStyleSet. Style must not have an associated
    // FormatStyleSet.
    // Style.Language should be different than LK_None. If this FormatStyleSet
    // already contains an entry for Style.Language, that gets replaced with the
    // passed Style.
    void Add(FormatStyle Style);

    // Clears this FormatStyleSet.
    void Clear();

  private:
    std::shared_ptr<MapType> Styles;
  };

  static FormatStyleSet BuildStyleSetFromConfiguration(
      const FormatStyle &MainStyle,
      const std::vector<FormatStyle> &ConfigurationStyles);

private:
  FormatStyleSet StyleSet;

  friend std::error_code parseConfiguration(StringRef Text, FormatStyle *Style);
};

/// Returns a format style complying with the LLVM coding standards:
/// http://llvm.org/docs/CodingStandards.html.
FormatStyle getLLVMStyle();

/// Returns a format style complying with one of Google's style guides:
/// http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml.
/// http://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml.
/// https://developers.google.com/protocol-buffers/docs/style.
FormatStyle getGoogleStyle(FormatStyle::LanguageKind Language);

/// Returns a format style complying with Chromium's style guide:
/// http://www.chromium.org/developers/coding-style.
FormatStyle getChromiumStyle(FormatStyle::LanguageKind Language);

/// Returns a format style complying with Mozilla's style guide:
/// https://developer.mozilla.org/en-US/docs/Developer_Guide/Coding_Style.
FormatStyle getMozillaStyle();

/// Returns a format style complying with Webkit's style guide:
/// http://www.webkit.org/coding/coding-style.html
FormatStyle getWebKitStyle();

/// Returns a format style complying with GNU Coding Standards:
/// http://www.gnu.org/prep/standards/standards.html
FormatStyle getGNUStyle();

/// Returns style indicating formatting should be not applied at all.
FormatStyle getNoStyle();

/// Gets a predefined style for the specified language by name.
///
/// Currently supported names: LLVM, Google, Chromium, Mozilla. Names are
/// compared case-insensitively.
///
/// Returns ``true`` if the Style has been set.
bool getPredefinedStyle(StringRef Name, FormatStyle::LanguageKind Language,
                        FormatStyle *Style);

/// Parse configuration from YAML-formatted text.
///
/// Style->Language is used to get the base style, if the ``BasedOnStyle``
/// option is present.
///
/// The FormatStyleSet of Style is reset.
///
/// When ``BasedOnStyle`` is not present, options not present in the YAML
/// document, are retained in \p Style.
std::error_code parseConfiguration(StringRef Text, FormatStyle *Style);

/// Gets configuration in a YAML string.
std::string configurationAsText(const FormatStyle &Style);

/// Returns the replacements necessary to sort all ``#include`` blocks
/// that are affected by ``Ranges``.
tooling::Replacements sortIncludes(const FormatStyle &Style, StringRef Code,
                                   ArrayRef<tooling::Range> Ranges,
                                   StringRef FileName,
                                   unsigned *Cursor = nullptr);

/// Returns the replacements corresponding to applying and formatting
/// \p Replaces on success; otheriwse, return an llvm::Error carrying
/// llvm::StringError.
llvm::Expected<tooling::Replacements>
formatReplacements(StringRef Code, const tooling::Replacements &Replaces,
                   const FormatStyle &Style);

/// Returns the replacements corresponding to applying \p Replaces and
/// cleaning up the code after that on success; otherwise, return an llvm::Error
/// carrying llvm::StringError.
/// This also supports inserting/deleting C++ #include directives:
/// - If a replacement has offset UINT_MAX, length 0, and a replacement text
///   that is an #include directive, this will insert the #include into the
///   correct block in the \p Code.
/// - If a replacement has offset UINT_MAX, length 1, and a replacement text
///   that is the name of the header to be removed, the header will be removed
///   from \p Code if it exists.
/// The include manipulation is done via `tooling::HeaderInclude`, see its
/// documentation for more details on how include insertion points are found and
/// what edits are produced.
llvm::Expected<tooling::Replacements>
cleanupAroundReplacements(StringRef Code, const tooling::Replacements &Replaces,
                          const FormatStyle &Style);

/// Represents the status of a formatting attempt.
struct FormattingAttemptStatus {
  /// A value of ``false`` means that any of the affected ranges were not
  /// formatted due to a non-recoverable syntax error.
  bool FormatComplete = true;

  /// If ``FormatComplete`` is false, ``Line`` records a one-based
  /// original line number at which a syntax error might have occurred. This is
  /// based on a best-effort analysis and could be imprecise.
  unsigned Line = 0;
};

/// Reformats the given \p Ranges in \p Code.
///
/// Each range is extended on either end to its next bigger logic unit, i.e.
/// everything that might influence its formatting or might be influenced by its
/// formatting.
///
/// Returns the ``Replacements`` necessary to make all \p Ranges comply with
/// \p Style.
///
/// If ``Status`` is non-null, its value will be populated with the status of
/// this formatting attempt. See \c FormattingAttemptStatus.
tooling::Replacements reformat(const FormatStyle &Style, StringRef Code,
                               ArrayRef<tooling::Range> Ranges,
                               StringRef FileName = "<stdin>",
                               FormattingAttemptStatus *Status = nullptr);

/// Same as above, except if ``IncompleteFormat`` is non-null, its value
/// will be set to true if any of the affected ranges were not formatted due to
/// a non-recoverable syntax error.
tooling::Replacements reformat(const FormatStyle &Style, StringRef Code,
                               ArrayRef<tooling::Range> Ranges,
                               StringRef FileName,
                               bool *IncompleteFormat);

/// Clean up any erroneous/redundant code in the given \p Ranges in \p
/// Code.
///
/// Returns the ``Replacements`` that clean up all \p Ranges in \p Code.
tooling::Replacements cleanup(const FormatStyle &Style, StringRef Code,
                              ArrayRef<tooling::Range> Ranges,
                              StringRef FileName = "<stdin>");

/// Fix namespace end comments in the given \p Ranges in \p Code.
///
/// Returns the ``Replacements`` that fix the namespace comments in all
/// \p Ranges in \p Code.
tooling::Replacements fixNamespaceEndComments(const FormatStyle &Style,
                                              StringRef Code,
                                              ArrayRef<tooling::Range> Ranges,
                                              StringRef FileName = "<stdin>");

/// Sort consecutive using declarations in the given \p Ranges in
/// \p Code.
///
/// Returns the ``Replacements`` that sort the using declarations in all
/// \p Ranges in \p Code.
tooling::Replacements sortUsingDeclarations(const FormatStyle &Style,
                                            StringRef Code,
                                            ArrayRef<tooling::Range> Ranges,
                                            StringRef FileName = "<stdin>");

/// Returns the ``LangOpts`` that the formatter expects you to set.
///
/// \param Style determines specific settings for lexing mode.
LangOptions getFormattingLangOpts(const FormatStyle &Style = getLLVMStyle());

/// Description to be used for help text for a ``llvm::cl`` option for
/// specifying format style. The description is closely related to the operation
/// of ``getStyle()``.
extern const char *StyleOptionHelpDescription;

/// The suggested format style to use by default. This allows tools using
/// `getStyle` to have a consistent default style.
/// Different builds can modify the value to the preferred styles.
extern const char *DefaultFormatStyle;

/// The suggested predefined style to use as the fallback style in `getStyle`.
/// Different builds can modify the value to the preferred styles.
extern const char *DefaultFallbackStyle;

/// Construct a FormatStyle based on ``StyleName``.
///
/// ``StyleName`` can take several forms:
/// * "{<key>: <value>, ...}" - Set specic style parameters.
/// * "<style name>" - One of the style names supported by
/// getPredefinedStyle().
/// * "file" - Load style configuration from a file called ``.clang-format``
/// located in one of the parent directories of ``FileName`` or the current
/// directory if ``FileName`` is empty.
///
/// \param[in] StyleName Style name to interpret according to the description
/// above.
/// \param[in] FileName Path to start search for .clang-format if ``StyleName``
/// == "file".
/// \param[in] FallbackStyle The name of a predefined style used to fallback to
/// in case \p StyleName is "file" and no file can be found.
/// \param[in] Code The actual code to be formatted. Used to determine the
/// language if the filename isn't sufficient.
/// \param[in] FS The underlying file system, in which the file resides. By
/// default, the file system is the real file system.
///
/// \returns FormatStyle as specified by ``StyleName``. If ``StyleName`` is
/// "file" and no file is found, returns ``FallbackStyle``. If no style could be
/// determined, returns an Error.
llvm::Expected<FormatStyle> getStyle(StringRef StyleName, StringRef FileName,
                                     StringRef FallbackStyle,
                                     StringRef Code = "",
                                     vfs::FileSystem *FS = nullptr);

// Guesses the language from the ``FileName`` and ``Code`` to be formatted.
// Defaults to FormatStyle::LK_Cpp.
FormatStyle::LanguageKind guessLanguage(StringRef FileName, StringRef Code);

// Returns a string representation of ``Language``.
inline StringRef getLanguageName(FormatStyle::LanguageKind Language) {
  switch (Language) {
  case FormatStyle::LK_Cpp:
    return "C++";
  case FormatStyle::LK_ObjC:
    return "Objective-C";
  case FormatStyle::LK_Java:
    return "Java";
  case FormatStyle::LK_JavaScript:
    return "JavaScript";
  case FormatStyle::LK_Proto:
    return "Proto";
  case FormatStyle::LK_TextProto:
    return "TextProto";
  default:
    return "Unknown";
  }
}

} // end namespace format
} // end namespace clang

namespace std {
template <>
struct is_error_code_enum<clang::format::ParseError> : std::true_type {};
}

#endif // LLVM_CLANG_FORMAT_FORMAT_H