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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.
#include "clang/Basic/LangOptions.h"
#include "clang/Tooling/Core/Replacement.h"
#include "llvm/ADT/ArrayRef.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 {
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);
/// \brief The ``FormatStyle`` is used to configure the formatting to follow
/// specific guidelines.
struct FormatStyle {
/// \brief The extra indent or outdent of access modifiers, e.g. ``public:``.
int AccessModifierOffset;
/// \brief Different styles for aligning after open brackets.
enum BracketAlignmentStyle {
/// \brief Align parameters on the open bracket, e.g.:
/// \code
/// someLongFunction(argument1,
/// argument2);
/// \endcode
/// \brief Don't align, instead use ``ContinuationIndentWidth``, e.g.:
/// \code
/// someLongFunction(argument1,
/// argument2);
/// \endcode
/// \brief Always break after an open bracket, if the parameters don't fit
/// on a single line, e.g.:
/// \code
/// someLongFunction(
/// argument1, argument2);
/// \endcode
/// \brief If ``true``, horizontally aligns arguments after an open bracket.
/// This applies to round brackets (parentheses), angle brackets and square
/// brackets.
BracketAlignmentStyle AlignAfterOpenBracket;
/// \brief 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;
/// \brief 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;
/// \brief If ``true``, aligns escaped newlines as far left as possible.
/// Otherwise puts them into the right-most column.
bool AlignEscapedNewlinesLeft;
/// \brief 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;
/// \brief If ``true``, aligns trailing comments.
bool AlignTrailingComments;
/// \brief Allow putting all parameters of a function declaration onto
/// the next line even if ``BinPackParameters`` is ``false``.
bool AllowAllParametersOfDeclarationOnNextLine;
/// \brief 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;
/// \brief If ``true``, short case labels will be contracted to a single line.
bool AllowShortCaseLabelsOnASingleLine;
/// \brief Different styles for merging short functions containing at most one
/// statement.
enum ShortFunctionStyle {
/// \brief Never merge functions into a single line.
/// \brief Only merge empty functions.
/// \brief Only merge functions defined inside a class. Implies "empty".
/// \brief Merge all functions fitting on a single line.
/// \brief Dependent on the value, ``int f() { return 0; }`` can be put on a
/// single line.
ShortFunctionStyle AllowShortFunctionsOnASingleLine;
/// \brief If ``true``, ``if (a) return;`` can be put on a single line.
bool AllowShortIfStatementsOnASingleLine;
/// \brief If ``true``, ``while (true) continue;`` can be put on a single
/// line.
bool AllowShortLoopsOnASingleLine;
/// \brief Different ways to break after the function definition return type.
enum DefinitionReturnTypeBreakingStyle {
/// Break after return type automatically.
/// ``PenaltyReturnTypeOnItsOwnLine`` is taken into account.
/// Always break after the return type.
/// Always break after the return types of top-level functions.
/// \brief Different ways to break after the function definition or
/// declaration return type.
enum ReturnTypeBreakingStyle {
/// Break after return type automatically.
/// ``PenaltyReturnTypeOnItsOwnLine`` is taken into account.
/// Always break after the return type.
/// Always break after the return types of top-level functions.
/// Always break after the return type of function definitions.
/// Always break after the return type of top-level definitions.
/// \brief The function definition return type breaking style to use. This
/// option is deprecated and is retained for backwards compatibility.
DefinitionReturnTypeBreakingStyle AlwaysBreakAfterDefinitionReturnType;
/// \brief The function declaration return type breaking style to use.
ReturnTypeBreakingStyle AlwaysBreakAfterReturnType;
/// \brief 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.
bool AlwaysBreakBeforeMultilineStrings;
/// \brief If ``true``, always break after the ``template<...>`` of a template
/// declaration.
bool AlwaysBreakTemplateDeclarations;
/// \brief If ``false``, a function call's arguments will either be all on the
/// same line or will have one line each.
bool BinPackArguments;
/// \brief 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.
bool BinPackParameters;
/// \brief The style of breaking before or after binary operators.
enum BinaryOperatorStyle {
/// Break after operators.
/// Break before operators that aren't assignments.
/// Break before operators.
/// \brief The way to wrap binary operators.
BinaryOperatorStyle BreakBeforeBinaryOperators;
/// \brief Different ways to attach braces to their surrounding context.
enum BraceBreakingStyle {
/// Always attach braces to surrounding context.
/// Like ``Attach``, but break before braces on function, namespace and
/// class definitions.
/// Like ``Attach``, but break before braces on enum, function, and record
/// definitions.
/// Like ``Attach``, but break before function definitions, ``catch``, and
/// ``else``.
/// Always break before braces.
/// 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.
/// Like ``Attach``, but break before functions.
/// Configure each individual brace in `BraceWrapping`.
/// \brief The brace breaking style to use.
BraceBreakingStyle BreakBeforeBraces;
/// \brief Precise control over the wrapping of braces.
struct BraceWrappingFlags {
/// \brief Wrap class definitions.
bool AfterClass;
/// \brief Wrap control statements (``if``/``for``/``while``/``switch``/..).
bool AfterControlStatement;
/// \brief Wrap enum definitions.
bool AfterEnum;
/// \brief Wrap function definitions.
bool AfterFunction;
/// \brief Wrap namespace definitions.
bool AfterNamespace;
/// \brief Wrap ObjC definitions (``@autoreleasepool``, interfaces, ..).
bool AfterObjCDeclaration;
/// \brief Wrap struct definitions.
bool AfterStruct;
/// \brief Wrap union definitions.
bool AfterUnion;
/// \brief Wrap before ``catch``.
bool BeforeCatch;
/// \brief Wrap before ``else``.
bool BeforeElse;
/// \brief Indent the wrapped braces themselves.
bool IndentBraces;
/// \brief 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.
BraceWrappingFlags BraceWrapping;
/// \brief If ``true``, ternary operators will be placed after line breaks.
bool BreakBeforeTernaryOperators;
/// \brief Always break constructor initializers before commas and align
/// the commas with the colon.
bool BreakConstructorInitializersBeforeComma;
/// \brief Break after each annotation on a field in Java files.
bool BreakAfterJavaFieldAnnotations;
/// \brief Allow breaking string literals when formatting.
bool BreakStringLiterals;
/// \brief 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;
/// \brief A regular expression that describes comments with special meaning,
/// which should not be split into lines or otherwise changed.
std::string CommentPragmas;
/// \brief If the constructor initializers don't fit on a line, put each
/// initializer on its own line.
bool ConstructorInitializerAllOnOneLineOrOnePerLine;
/// \brief The number of characters to use for indentation of constructor
/// initializer lists.
unsigned ConstructorInitializerIndentWidth;
/// \brief Indent width for line continuations.
unsigned ContinuationIndentWidth;
/// \brief 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.
bool Cpp11BracedListStyle;
/// \brief If ``true``, analyze the formatted file for the most common
/// alignment of ``&`` and ``*``. ``PointerAlignment`` is then used only as
/// fallback.
bool DerivePointerAlignment;
/// \brief Disables formatting completely.
bool DisableFormat;
/// \brief 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;
/// \brief 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;
/// \brief See documentation of ``IncludeCategories``.
struct IncludeCategory {
/// \brief The regular expression that this category matches.
std::string Regex;
/// \brief The priority to assign to this category.
int Priority;
bool operator==(const IncludeCategory &Other) const {
return Regex == Other.Regex && Priority == Other.Priority;
/// \brief Regular expressions denoting the different ``#include`` categories
/// used for ordering ``#includes``.
/// These regular expressions are matched against the filename of an include
/// (including the <> or "") in order. The value belonging to the first
/// matching regular expression is assigned and ``#includes`` are sorted first
/// according to increasing category number and then alphabetically within
/// each category.
/// If none of the regular expressions match, INT_MAX is assigned as
/// category. The main header for a source file automatically gets category 0.
/// so that it is generally kept at the beginning of the ``#includes``
/// ( However, you
/// can also assign negative priorities if you have certain headers that
/// always need to be first.
/// To configure this in the .clang-format file, use:
/// \code{.yaml}
/// IncludeCategories:
/// - Regex: '^"(llvm|llvm-c|clang|clang-c)/'
/// Priority: 2
/// - Regex: '^(<|"(gtest|isl|json)/)'
/// Priority: 3
/// - Regex: '.*'
/// Priority: 1
/// \endcode
std::vector<IncludeCategory> IncludeCategories;
/// \brief Specify a regular expression of suffixes that are allowed in the
/// file-to-main-include mapping.
/// When guessing whether a #include is the "main" include (to assign
/// category 0, see above), use this regex of allowed suffixes to the header
/// stem. A partial match is done, so that:
/// - "" means "arbitrary suffix"
/// - "$" means "no suffix"
/// For example, if configured to "(_test)?$", then a header a.h would be seen
/// as the "main" include in both and
std::string IncludeIsMainRegex;
/// \brief 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.
bool IndentCaseLabels;
/// \brief The number of columns to use for indentation.
unsigned IndentWidth;
/// \brief Indent if a function definition or declaration is wrapped after the
/// type.
bool IndentWrappedFunctionNames;
/// \brief Quotation styles for JavaScript strings. Does not affect template
/// strings.
enum JavaScriptQuoteStyle {
/// Leave string quotes as they are.
/// Always use single quotes.
/// Always use double quotes.
/// \brief The JavaScriptQuoteStyle to use for JavaScript strings.
JavaScriptQuoteStyle JavaScriptQuotes;
/// \brief Whether to wrap JavaScript import/export statements.
bool JavaScriptWrapImports;
/// \brief If true, empty lines at the start of blocks are kept.
bool KeepEmptyLinesAtTheStartOfBlocks;
/// \brief 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.
/// Should be used for C, C++, ObjectiveC, ObjectiveC++.
/// Should be used for Java.
/// Should be used for JavaScript.
/// Should be used for ObjC code.
/// Should be used for Protocol Buffers
/// (
/// Should be used for TableGen code.
/// \brief Language, this format style is targeted at.
LanguageKind Language;
/// \brief A regular expression matching macros that start a block.
std::string MacroBlockBegin;
/// \brief A regular expression matching macros that end a block.
std::string MacroBlockEnd;
/// \brief The maximum number of consecutive empty lines to keep.
unsigned MaxEmptyLinesToKeep;
/// \brief Different ways to indent namespace contents.
enum NamespaceIndentationKind {
/// Don't indent in namespaces.
/// Indent only in inner namespaces (nested in other namespaces).
/// Indent in all namespaces.
/// \brief The indentation used for namespaces.
NamespaceIndentationKind NamespaceIndentation;
/// \brief The number of characters to use for indentation of ObjC blocks.
unsigned ObjCBlockIndentWidth;
/// \brief Add a space after ``@property`` in Objective-C, i.e. use
/// ``@property (readonly)`` instead of ``@property(readonly)``.
bool ObjCSpaceAfterProperty;
/// \brief Add a space in front of an Objective-C protocol list, i.e. use
/// ``Foo <Protocol>`` instead of ``Foo<Protocol>``.
bool ObjCSpaceBeforeProtocolList;
/// \brief The penalty for breaking a function call after ``call(``.
unsigned PenaltyBreakBeforeFirstCallParameter;
/// \brief The penalty for each line break introduced inside a comment.
unsigned PenaltyBreakComment;
/// \brief The penalty for breaking before the first ``<<``.
unsigned PenaltyBreakFirstLessLess;
/// \brief The penalty for each line break introduced inside a string literal.
unsigned PenaltyBreakString;
/// \brief The penalty for each character outside of the column limit.
unsigned PenaltyExcessCharacter;
/// \brief Penalty for putting the return type of a function onto its own
/// line.
unsigned PenaltyReturnTypeOnItsOwnLine;
/// \brief The ``&`` and ``*`` alignment style.
enum PointerAlignmentStyle {
/// Align pointer to the left.
/// Align pointer to the right.
/// Align pointer in the middle.
/// \brief Pointer and reference alignment style.
PointerAlignmentStyle PointerAlignment;
/// \brief If ``true``, clang-format will attempt to re-flow comments.
bool ReflowComments;
/// \brief If ``true``, clang-format will sort ``#includes``.
bool SortIncludes;
/// \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;
/// \brief Different ways to put a space before opening parentheses.
enum SpaceBeforeParensOptions {
/// Never put a space before opening parentheses.
/// Put a space before opening parentheses only after control statement
/// keywords (``for/if/while...``).
/// 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.)
/// \brief Defines in which cases to put a space before opening parentheses.
SpaceBeforeParensOptions SpaceBeforeParens;
/// \brief If ``true``, spaces may be inserted into ``()``.
bool SpaceInEmptyParentheses;
/// \brief 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.
unsigned SpacesBeforeTrailingComments;
/// \brief If ``true``, spaces will be inserted after ``<`` and before ``>``
/// in template argument lists.
bool SpacesInAngles;
/// \brief If ``true``, spaces are inserted inside container literals (e.g.
/// ObjC and Javascript array and dict literals).
bool SpacesInContainerLiterals;
/// \brief If ``true``, spaces may be inserted into C style casts.
bool SpacesInCStyleCastParentheses;
/// \brief If ``true``, spaces will be inserted after ``(`` and before ``)``.
bool SpacesInParentheses;
/// \brief If ``true``, spaces will be inserted after ``[`` and before ``]``.
bool SpacesInSquareBrackets;
/// \brief Supported language standards.
enum LanguageStandard {
/// Use C++03-compatible syntax.
/// Use features of C++11, C++14 and C++1z (e.g. ``A<A<int>>`` instead of
/// ``A<A<int> >``).
/// Automatic detection based on the input.
/// \brief Format compatible with this standard, e.g. use ``A<A<int> >``
/// instead of ``A<A<int>>`` for ``LS_Cpp03``.
LanguageStandard Standard;
/// \brief The number of columns used for tab stops.
unsigned TabWidth;
/// \brief Different ways to use tab in formatting.
enum UseTabStyle {
/// Never use tab.
/// Use tabs only for indentation.
/// Use tabs only for line continuation and indentation.
/// Use tabs whenever we need to fill whitespace that spans at least from
/// one tab stop to the next one.
/// \brief 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 &&
AlignEscapedNewlinesLeft == R.AlignEscapedNewlinesLeft &&
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 &&
BreakConstructorInitializersBeforeComma ==
R.BreakConstructorInitializersBeforeComma &&
BreakAfterJavaFieldAnnotations == R.BreakAfterJavaFieldAnnotations &&
BreakStringLiterals == R.BreakStringLiterals &&
ColumnLimit == R.ColumnLimit && CommentPragmas == R.CommentPragmas &&
ConstructorInitializerAllOnOneLineOrOnePerLine ==
R.ConstructorInitializerAllOnOneLineOrOnePerLine &&
ConstructorInitializerIndentWidth ==
R.ConstructorInitializerIndentWidth &&
ContinuationIndentWidth == R.ContinuationIndentWidth &&
Cpp11BracedListStyle == R.Cpp11BracedListStyle &&
DerivePointerAlignment == R.DerivePointerAlignment &&
DisableFormat == R.DisableFormat &&
ExperimentalAutoDetectBinPacking ==
R.ExperimentalAutoDetectBinPacking &&
ForEachMacros == R.ForEachMacros &&
IncludeCategories == R.IncludeCategories &&
IndentCaseLabels == R.IndentCaseLabels &&
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 &&
ObjCBlockIndentWidth == R.ObjCBlockIndentWidth &&
ObjCSpaceAfterProperty == R.ObjCSpaceAfterProperty &&
ObjCSpaceBeforeProtocolList == R.ObjCSpaceBeforeProtocolList &&
PenaltyBreakBeforeFirstCallParameter ==
R.PenaltyBreakBeforeFirstCallParameter &&
PenaltyBreakComment == R.PenaltyBreakComment &&
PenaltyBreakFirstLessLess == R.PenaltyBreakFirstLessLess &&
PenaltyBreakString == R.PenaltyBreakString &&
PenaltyExcessCharacter == R.PenaltyExcessCharacter &&
PenaltyReturnTypeOnItsOwnLine == R.PenaltyReturnTypeOnItsOwnLine &&
PointerAlignment == R.PointerAlignment &&
SpaceAfterCStyleCast == R.SpaceAfterCStyleCast &&
SpaceAfterTemplateKeyword == R.SpaceAfterTemplateKeyword &&
SpaceBeforeAssignmentOperators == R.SpaceBeforeAssignmentOperators &&
SpaceBeforeParens == R.SpaceBeforeParens &&
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;
/// \brief Returns a format style complying with the LLVM coding standards:
FormatStyle getLLVMStyle();
/// \brief Returns a format style complying with one of Google's style guides:
FormatStyle getGoogleStyle(FormatStyle::LanguageKind Language);
/// \brief Returns a format style complying with Chromium's style guide:
FormatStyle getChromiumStyle(FormatStyle::LanguageKind Language);
/// \brief Returns a format style complying with Mozilla's style guide:
FormatStyle getMozillaStyle();
/// \brief Returns a format style complying with Webkit's style guide:
FormatStyle getWebKitStyle();
/// \brief Returns a format style complying with GNU Coding Standards:
FormatStyle getGNUStyle();
/// \brief Returns style indicating formatting should be not applied at all.
FormatStyle getNoStyle();
/// \brief 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);
/// \brief Parse configuration from YAML-formatted text.
/// Style->Language is used to get the base style, if the ``BasedOnStyle``
/// option is present.
/// 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);
/// \brief Gets configuration in a YAML string.
std::string configurationAsText(const FormatStyle &Style);
/// \brief 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);
/// \brief Returns the replacements corresponding to applying and formatting
/// \p Replaces on success; otheriwse, return an llvm::Error carrying
/// llvm::StringError.
formatReplacements(StringRef Code, const tooling::Replacements &Replaces,
const FormatStyle &Style);
/// \brief 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. When searching for points to insert new
/// header, this ignores #include's after the #include block(s) in the
/// beginning of a file to avoid inserting headers into code sections where
/// new #include's should not be added by default. These code sections
/// include:
/// - raw string literals (containing #include).
/// - #if blocks.
/// - Special #include's among declarations (e.g. functions).
/// - 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.
cleanupAroundReplacements(StringRef Code, const tooling::Replacements &Replaces,
const FormatStyle &Style);
/// \brief 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 ``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 = "<stdin>",
bool *IncompleteFormat = nullptr);
/// \brief 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>");
/// \brief Returns the ``LangOpts`` that the formatter expects you to set.
/// \param Style determines specific settings for lexing mode.
LangOptions getFormattingLangOpts(const FormatStyle &Style = getLLVMStyle());
/// \brief 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;
/// \brief 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 the style can't be determined from \p StyleName.
/// \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 no style could be
/// determined, the default is LLVM Style (see ``getLLVMStyle()``).
FormatStyle getStyle(StringRef StyleName, StringRef FileName,
StringRef FallbackStyle, StringRef Code = "",
vfs::FileSystem *FS = nullptr);
// \brief Returns a string representation of ``Language``.
inline StringRef getLanguageName(FormatStyle::LanguageKind Language) {
switch (Language) {
case FormatStyle::LK_Cpp:
return "C++";
case FormatStyle::LK_Java:
return "Java";
case FormatStyle::LK_JavaScript:
return "JavaScript";
case FormatStyle::LK_Proto:
return "Proto";
return "Unknown";
} // end namespace format
} // end namespace clang
namespace std {
template <>
struct is_error_code_enum<clang::format::ParseError> : std::true_type {};