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      1 //===--- FormatToken.h - Format C++ code ------------------------*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 ///
     10 /// \file
     11 /// \brief This file contains the declaration of the FormatToken, a wrapper
     12 /// around Token with additional information related to formatting.
     13 ///
     14 //===----------------------------------------------------------------------===//
     15 
     16 #ifndef LLVM_CLANG_LIB_FORMAT_FORMATTOKEN_H
     17 #define LLVM_CLANG_LIB_FORMAT_FORMATTOKEN_H
     18 
     19 #include "clang/Basic/IdentifierTable.h"
     20 #include "clang/Basic/OperatorPrecedence.h"
     21 #include "clang/Format/Format.h"
     22 #include "clang/Lex/Lexer.h"
     23 #include <memory>
     24 
     25 namespace clang {
     26 namespace format {
     27 
     28 #define LIST_TOKEN_TYPES \
     29   TYPE(ArrayInitializerLSquare) \
     30   TYPE(ArraySubscriptLSquare) \
     31   TYPE(AttributeParen) \
     32   TYPE(BinaryOperator) \
     33   TYPE(BitFieldColon) \
     34   TYPE(BlockComment) \
     35   TYPE(CastRParen) \
     36   TYPE(ConditionalExpr) \
     37   TYPE(ConflictAlternative) \
     38   TYPE(ConflictEnd) \
     39   TYPE(ConflictStart) \
     40   TYPE(CtorInitializerColon) \
     41   TYPE(CtorInitializerComma) \
     42   TYPE(DesignatedInitializerPeriod) \
     43   TYPE(DictLiteral) \
     44   TYPE(ForEachMacro) \
     45   TYPE(FunctionAnnotationRParen) \
     46   TYPE(FunctionDeclarationName) \
     47   TYPE(FunctionLBrace) \
     48   TYPE(FunctionTypeLParen) \
     49   TYPE(ImplicitStringLiteral) \
     50   TYPE(InheritanceColon) \
     51   TYPE(InlineASMBrace) \
     52   TYPE(InlineASMColon) \
     53   TYPE(JavaAnnotation) \
     54   TYPE(JsComputedPropertyName) \
     55   TYPE(JsFatArrow) \
     56   TYPE(JsTypeColon) \
     57   TYPE(JsTypeOptionalQuestion) \
     58   TYPE(LambdaArrow) \
     59   TYPE(LambdaLSquare) \
     60   TYPE(LeadingJavaAnnotation) \
     61   TYPE(LineComment) \
     62   TYPE(MacroBlockBegin) \
     63   TYPE(MacroBlockEnd) \
     64   TYPE(ObjCBlockLBrace) \
     65   TYPE(ObjCBlockLParen) \
     66   TYPE(ObjCDecl) \
     67   TYPE(ObjCForIn) \
     68   TYPE(ObjCMethodExpr) \
     69   TYPE(ObjCMethodSpecifier) \
     70   TYPE(ObjCProperty) \
     71   TYPE(ObjCStringLiteral) \
     72   TYPE(OverloadedOperator) \
     73   TYPE(OverloadedOperatorLParen) \
     74   TYPE(PointerOrReference) \
     75   TYPE(PureVirtualSpecifier) \
     76   TYPE(RangeBasedForLoopColon) \
     77   TYPE(RegexLiteral) \
     78   TYPE(SelectorName) \
     79   TYPE(StartOfName) \
     80   TYPE(TemplateCloser) \
     81   TYPE(TemplateOpener) \
     82   TYPE(TemplateString) \
     83   TYPE(TrailingAnnotation) \
     84   TYPE(TrailingReturnArrow) \
     85   TYPE(TrailingUnaryOperator) \
     86   TYPE(UnaryOperator) \
     87   TYPE(Unknown)
     88 
     89 enum TokenType {
     90 #define TYPE(X) TT_##X,
     91 LIST_TOKEN_TYPES
     92 #undef TYPE
     93   NUM_TOKEN_TYPES
     94 };
     95 
     96 /// \brief Determines the name of a token type.
     97 const char *getTokenTypeName(TokenType Type);
     98 
     99 // Represents what type of block a set of braces open.
    100 enum BraceBlockKind { BK_Unknown, BK_Block, BK_BracedInit };
    101 
    102 // The packing kind of a function's parameters.
    103 enum ParameterPackingKind { PPK_BinPacked, PPK_OnePerLine, PPK_Inconclusive };
    104 
    105 enum FormatDecision { FD_Unformatted, FD_Continue, FD_Break };
    106 
    107 class TokenRole;
    108 class AnnotatedLine;
    109 
    110 /// \brief A wrapper around a \c Token storing information about the
    111 /// whitespace characters preceding it.
    112 struct FormatToken {
    113   FormatToken() {}
    114 
    115   /// \brief The \c Token.
    116   Token Tok;
    117 
    118   /// \brief The number of newlines immediately before the \c Token.
    119   ///
    120   /// This can be used to determine what the user wrote in the original code
    121   /// and thereby e.g. leave an empty line between two function definitions.
    122   unsigned NewlinesBefore = 0;
    123 
    124   /// \brief Whether there is at least one unescaped newline before the \c
    125   /// Token.
    126   bool HasUnescapedNewline = false;
    127 
    128   /// \brief The range of the whitespace immediately preceding the \c Token.
    129   SourceRange WhitespaceRange;
    130 
    131   /// \brief The offset just past the last '\n' in this token's leading
    132   /// whitespace (relative to \c WhiteSpaceStart). 0 if there is no '\n'.
    133   unsigned LastNewlineOffset = 0;
    134 
    135   /// \brief The width of the non-whitespace parts of the token (or its first
    136   /// line for multi-line tokens) in columns.
    137   /// We need this to correctly measure number of columns a token spans.
    138   unsigned ColumnWidth = 0;
    139 
    140   /// \brief Contains the width in columns of the last line of a multi-line
    141   /// token.
    142   unsigned LastLineColumnWidth = 0;
    143 
    144   /// \brief Whether the token text contains newlines (escaped or not).
    145   bool IsMultiline = false;
    146 
    147   /// \brief Indicates that this is the first token.
    148   bool IsFirst = false;
    149 
    150   /// \brief Whether there must be a line break before this token.
    151   ///
    152   /// This happens for example when a preprocessor directive ended directly
    153   /// before the token.
    154   bool MustBreakBefore = false;
    155 
    156   /// \brief The raw text of the token.
    157   ///
    158   /// Contains the raw token text without leading whitespace and without leading
    159   /// escaped newlines.
    160   StringRef TokenText;
    161 
    162   /// \brief Set to \c true if this token is an unterminated literal.
    163   bool IsUnterminatedLiteral = 0;
    164 
    165   /// \brief Contains the kind of block if this token is a brace.
    166   BraceBlockKind BlockKind = BK_Unknown;
    167 
    168   TokenType Type = TT_Unknown;
    169 
    170   /// \brief The number of spaces that should be inserted before this token.
    171   unsigned SpacesRequiredBefore = 0;
    172 
    173   /// \brief \c true if it is allowed to break before this token.
    174   bool CanBreakBefore = false;
    175 
    176   /// \brief \c true if this is the ">" of "template<..>".
    177   bool ClosesTemplateDeclaration = false;
    178 
    179   /// \brief Number of parameters, if this is "(", "[" or "<".
    180   ///
    181   /// This is initialized to 1 as we don't need to distinguish functions with
    182   /// 0 parameters from functions with 1 parameter. Thus, we can simply count
    183   /// the number of commas.
    184   unsigned ParameterCount = 0;
    185 
    186   /// \brief Number of parameters that are nested blocks,
    187   /// if this is "(", "[" or "<".
    188   unsigned BlockParameterCount = 0;
    189 
    190   /// \brief If this is a bracket ("<", "(", "[" or "{"), contains the kind of
    191   /// the surrounding bracket.
    192   tok::TokenKind ParentBracket = tok::unknown;
    193 
    194   /// \brief A token can have a special role that can carry extra information
    195   /// about the token's formatting.
    196   std::unique_ptr<TokenRole> Role;
    197 
    198   /// \brief If this is an opening parenthesis, how are the parameters packed?
    199   ParameterPackingKind PackingKind = PPK_Inconclusive;
    200 
    201   /// \brief The total length of the unwrapped line up to and including this
    202   /// token.
    203   unsigned TotalLength = 0;
    204 
    205   /// \brief The original 0-based column of this token, including expanded tabs.
    206   /// The configured TabWidth is used as tab width.
    207   unsigned OriginalColumn = 0;
    208 
    209   /// \brief The length of following tokens until the next natural split point,
    210   /// or the next token that can be broken.
    211   unsigned UnbreakableTailLength = 0;
    212 
    213   // FIXME: Come up with a 'cleaner' concept.
    214   /// \brief The binding strength of a token. This is a combined value of
    215   /// operator precedence, parenthesis nesting, etc.
    216   unsigned BindingStrength = 0;
    217 
    218   /// \brief The nesting level of this token, i.e. the number of surrounding (),
    219   /// [], {} or <>.
    220   unsigned NestingLevel = 0;
    221 
    222   /// \brief Penalty for inserting a line break before this token.
    223   unsigned SplitPenalty = 0;
    224 
    225   /// \brief If this is the first ObjC selector name in an ObjC method
    226   /// definition or call, this contains the length of the longest name.
    227   ///
    228   /// This being set to 0 means that the selectors should not be colon-aligned,
    229   /// e.g. because several of them are block-type.
    230   unsigned LongestObjCSelectorName = 0;
    231 
    232   /// \brief Stores the number of required fake parentheses and the
    233   /// corresponding operator precedence.
    234   ///
    235   /// If multiple fake parentheses start at a token, this vector stores them in
    236   /// reverse order, i.e. inner fake parenthesis first.
    237   SmallVector<prec::Level, 4> FakeLParens;
    238   /// \brief Insert this many fake ) after this token for correct indentation.
    239   unsigned FakeRParens = 0;
    240 
    241   /// \brief \c true if this token starts a binary expression, i.e. has at least
    242   /// one fake l_paren with a precedence greater than prec::Unknown.
    243   bool StartsBinaryExpression = false;
    244   /// \brief \c true if this token ends a binary expression.
    245   bool EndsBinaryExpression = false;
    246 
    247   /// \brief Is this is an operator (or "."/"->") in a sequence of operators
    248   /// with the same precedence, contains the 0-based operator index.
    249   unsigned OperatorIndex = 0;
    250 
    251   /// \brief Is this the last operator (or "."/"->") in a sequence of operators
    252   /// with the same precedence?
    253   bool LastOperator = false;
    254 
    255   /// \brief Is this token part of a \c DeclStmt defining multiple variables?
    256   ///
    257   /// Only set if \c Type == \c TT_StartOfName.
    258   bool PartOfMultiVariableDeclStmt = false;
    259 
    260   /// \brief If this is a bracket, this points to the matching one.
    261   FormatToken *MatchingParen = nullptr;
    262 
    263   /// \brief The previous token in the unwrapped line.
    264   FormatToken *Previous = nullptr;
    265 
    266   /// \brief The next token in the unwrapped line.
    267   FormatToken *Next = nullptr;
    268 
    269   /// \brief If this token starts a block, this contains all the unwrapped lines
    270   /// in it.
    271   SmallVector<AnnotatedLine *, 1> Children;
    272 
    273   /// \brief Stores the formatting decision for the token once it was made.
    274   FormatDecision Decision = FD_Unformatted;
    275 
    276   /// \brief If \c true, this token has been fully formatted (indented and
    277   /// potentially re-formatted inside), and we do not allow further formatting
    278   /// changes.
    279   bool Finalized = false;
    280 
    281   bool is(tok::TokenKind Kind) const { return Tok.is(Kind); }
    282   bool is(TokenType TT) const { return Type == TT; }
    283   bool is(const IdentifierInfo *II) const {
    284     return II && II == Tok.getIdentifierInfo();
    285   }
    286   bool is(tok::PPKeywordKind Kind) const {
    287     return Tok.getIdentifierInfo() &&
    288            Tok.getIdentifierInfo()->getPPKeywordID() == Kind;
    289   }
    290   template <typename A, typename B> bool isOneOf(A K1, B K2) const {
    291     return is(K1) || is(K2);
    292   }
    293   template <typename A, typename B, typename... Ts>
    294   bool isOneOf(A K1, B K2, Ts... Ks) const {
    295     return is(K1) || isOneOf(K2, Ks...);
    296   }
    297   template <typename T> bool isNot(T Kind) const { return !is(Kind); }
    298 
    299   bool isStringLiteral() const { return tok::isStringLiteral(Tok.getKind()); }
    300 
    301   bool isObjCAtKeyword(tok::ObjCKeywordKind Kind) const {
    302     return Tok.isObjCAtKeyword(Kind);
    303   }
    304 
    305   bool isAccessSpecifier(bool ColonRequired = true) const {
    306     return isOneOf(tok::kw_public, tok::kw_protected, tok::kw_private) &&
    307            (!ColonRequired || (Next && Next->is(tok::colon)));
    308   }
    309 
    310   /// \brief Determine whether the token is a simple-type-specifier.
    311   bool isSimpleTypeSpecifier() const;
    312 
    313   bool isObjCAccessSpecifier() const {
    314     return is(tok::at) && Next && (Next->isObjCAtKeyword(tok::objc_public) ||
    315                                    Next->isObjCAtKeyword(tok::objc_protected) ||
    316                                    Next->isObjCAtKeyword(tok::objc_package) ||
    317                                    Next->isObjCAtKeyword(tok::objc_private));
    318   }
    319 
    320   /// \brief Returns whether \p Tok is ([{ or a template opening <.
    321   bool opensScope() const {
    322     return isOneOf(tok::l_paren, tok::l_brace, tok::l_square,
    323                    TT_TemplateOpener);
    324   }
    325   /// \brief Returns whether \p Tok is )]} or a template closing >.
    326   bool closesScope() const {
    327     return isOneOf(tok::r_paren, tok::r_brace, tok::r_square,
    328                    TT_TemplateCloser);
    329   }
    330 
    331   /// \brief Returns \c true if this is a "." or "->" accessing a member.
    332   bool isMemberAccess() const {
    333     return isOneOf(tok::arrow, tok::period, tok::arrowstar) &&
    334            !isOneOf(TT_DesignatedInitializerPeriod, TT_TrailingReturnArrow,
    335                     TT_LambdaArrow);
    336   }
    337 
    338   bool isUnaryOperator() const {
    339     switch (Tok.getKind()) {
    340     case tok::plus:
    341     case tok::plusplus:
    342     case tok::minus:
    343     case tok::minusminus:
    344     case tok::exclaim:
    345     case tok::tilde:
    346     case tok::kw_sizeof:
    347     case tok::kw_alignof:
    348       return true;
    349     default:
    350       return false;
    351     }
    352   }
    353 
    354   bool isBinaryOperator() const {
    355     // Comma is a binary operator, but does not behave as such wrt. formatting.
    356     return getPrecedence() > prec::Comma;
    357   }
    358 
    359   bool isTrailingComment() const {
    360     return is(tok::comment) &&
    361            (is(TT_LineComment) || !Next || Next->NewlinesBefore > 0);
    362   }
    363 
    364   /// \brief Returns \c true if this is a keyword that can be used
    365   /// like a function call (e.g. sizeof, typeid, ...).
    366   bool isFunctionLikeKeyword() const {
    367     switch (Tok.getKind()) {
    368     case tok::kw_throw:
    369     case tok::kw_typeid:
    370     case tok::kw_return:
    371     case tok::kw_sizeof:
    372     case tok::kw_alignof:
    373     case tok::kw_alignas:
    374     case tok::kw_decltype:
    375     case tok::kw_noexcept:
    376     case tok::kw_static_assert:
    377     case tok::kw___attribute:
    378       return true;
    379     default:
    380       return false;
    381     }
    382   }
    383 
    384   /// \brief Returns actual token start location without leading escaped
    385   /// newlines and whitespace.
    386   ///
    387   /// This can be different to Tok.getLocation(), which includes leading escaped
    388   /// newlines.
    389   SourceLocation getStartOfNonWhitespace() const {
    390     return WhitespaceRange.getEnd();
    391   }
    392 
    393   prec::Level getPrecedence() const {
    394     return getBinOpPrecedence(Tok.getKind(), true, true);
    395   }
    396 
    397   /// \brief Returns the previous token ignoring comments.
    398   FormatToken *getPreviousNonComment() const {
    399     FormatToken *Tok = Previous;
    400     while (Tok && Tok->is(tok::comment))
    401       Tok = Tok->Previous;
    402     return Tok;
    403   }
    404 
    405   /// \brief Returns the next token ignoring comments.
    406   const FormatToken *getNextNonComment() const {
    407     const FormatToken *Tok = Next;
    408     while (Tok && Tok->is(tok::comment))
    409       Tok = Tok->Next;
    410     return Tok;
    411   }
    412 
    413   /// \brief Returns \c true if this tokens starts a block-type list, i.e. a
    414   /// list that should be indented with a block indent.
    415   bool opensBlockOrBlockTypeList(const FormatStyle &Style) const {
    416     return is(TT_ArrayInitializerLSquare) ||
    417            (is(tok::l_brace) &&
    418             (BlockKind == BK_Block || is(TT_DictLiteral) ||
    419              (!Style.Cpp11BracedListStyle && NestingLevel == 0)));
    420   }
    421 
    422   /// \brief Same as opensBlockOrBlockTypeList, but for the closing token.
    423   bool closesBlockOrBlockTypeList(const FormatStyle &Style) const {
    424     return MatchingParen && MatchingParen->opensBlockOrBlockTypeList(Style);
    425   }
    426 
    427 private:
    428   // Disallow copying.
    429   FormatToken(const FormatToken &) = delete;
    430   void operator=(const FormatToken &) = delete;
    431 };
    432 
    433 class ContinuationIndenter;
    434 struct LineState;
    435 
    436 class TokenRole {
    437 public:
    438   TokenRole(const FormatStyle &Style) : Style(Style) {}
    439   virtual ~TokenRole();
    440 
    441   /// \brief After the \c TokenAnnotator has finished annotating all the tokens,
    442   /// this function precomputes required information for formatting.
    443   virtual void precomputeFormattingInfos(const FormatToken *Token);
    444 
    445   /// \brief Apply the special formatting that the given role demands.
    446   ///
    447   /// Assumes that the token having this role is already formatted.
    448   ///
    449   /// Continues formatting from \p State leaving indentation to \p Indenter and
    450   /// returns the total penalty that this formatting incurs.
    451   virtual unsigned formatFromToken(LineState &State,
    452                                    ContinuationIndenter *Indenter,
    453                                    bool DryRun) {
    454     return 0;
    455   }
    456 
    457   /// \brief Same as \c formatFromToken, but assumes that the first token has
    458   /// already been set thereby deciding on the first line break.
    459   virtual unsigned formatAfterToken(LineState &State,
    460                                     ContinuationIndenter *Indenter,
    461                                     bool DryRun) {
    462     return 0;
    463   }
    464 
    465   /// \brief Notifies the \c Role that a comma was found.
    466   virtual void CommaFound(const FormatToken *Token) {}
    467 
    468 protected:
    469   const FormatStyle &Style;
    470 };
    471 
    472 class CommaSeparatedList : public TokenRole {
    473 public:
    474   CommaSeparatedList(const FormatStyle &Style)
    475       : TokenRole(Style), HasNestedBracedList(false) {}
    476 
    477   void precomputeFormattingInfos(const FormatToken *Token) override;
    478 
    479   unsigned formatAfterToken(LineState &State, ContinuationIndenter *Indenter,
    480                             bool DryRun) override;
    481 
    482   unsigned formatFromToken(LineState &State, ContinuationIndenter *Indenter,
    483                            bool DryRun) override;
    484 
    485   /// \brief Adds \p Token as the next comma to the \c CommaSeparated list.
    486   void CommaFound(const FormatToken *Token) override {
    487     Commas.push_back(Token);
    488   }
    489 
    490 private:
    491   /// \brief A struct that holds information on how to format a given list with
    492   /// a specific number of columns.
    493   struct ColumnFormat {
    494     /// \brief The number of columns to use.
    495     unsigned Columns;
    496 
    497     /// \brief The total width in characters.
    498     unsigned TotalWidth;
    499 
    500     /// \brief The number of lines required for this format.
    501     unsigned LineCount;
    502 
    503     /// \brief The size of each column in characters.
    504     SmallVector<unsigned, 8> ColumnSizes;
    505   };
    506 
    507   /// \brief Calculate which \c ColumnFormat fits best into
    508   /// \p RemainingCharacters.
    509   const ColumnFormat *getColumnFormat(unsigned RemainingCharacters) const;
    510 
    511   /// \brief The ordered \c FormatTokens making up the commas of this list.
    512   SmallVector<const FormatToken *, 8> Commas;
    513 
    514   /// \brief The length of each of the list's items in characters including the
    515   /// trailing comma.
    516   SmallVector<unsigned, 8> ItemLengths;
    517 
    518   /// \brief Precomputed formats that can be used for this list.
    519   SmallVector<ColumnFormat, 4> Formats;
    520 
    521   bool HasNestedBracedList;
    522 };
    523 
    524 /// \brief Encapsulates keywords that are context sensitive or for languages not
    525 /// properly supported by Clang's lexer.
    526 struct AdditionalKeywords {
    527   AdditionalKeywords(IdentifierTable &IdentTable) {
    528     kw_final = &IdentTable.get("final");
    529     kw_override = &IdentTable.get("override");
    530     kw_in = &IdentTable.get("in");
    531     kw_CF_ENUM = &IdentTable.get("CF_ENUM");
    532     kw_CF_OPTIONS = &IdentTable.get("CF_OPTIONS");
    533     kw_NS_ENUM = &IdentTable.get("NS_ENUM");
    534     kw_NS_OPTIONS = &IdentTable.get("NS_OPTIONS");
    535 
    536     kw_finally = &IdentTable.get("finally");
    537     kw_function = &IdentTable.get("function");
    538     kw_import = &IdentTable.get("import");
    539     kw_let = &IdentTable.get("let");
    540     kw_var = &IdentTable.get("var");
    541 
    542     kw_abstract = &IdentTable.get("abstract");
    543     kw_assert = &IdentTable.get("assert");
    544     kw_extends = &IdentTable.get("extends");
    545     kw_implements = &IdentTable.get("implements");
    546     kw_instanceof = &IdentTable.get("instanceof");
    547     kw_interface = &IdentTable.get("interface");
    548     kw_native = &IdentTable.get("native");
    549     kw_package = &IdentTable.get("package");
    550     kw_synchronized = &IdentTable.get("synchronized");
    551     kw_throws = &IdentTable.get("throws");
    552     kw___except = &IdentTable.get("__except");
    553 
    554     kw_mark = &IdentTable.get("mark");
    555 
    556     kw_extend = &IdentTable.get("extend");
    557     kw_option = &IdentTable.get("option");
    558     kw_optional = &IdentTable.get("optional");
    559     kw_repeated = &IdentTable.get("repeated");
    560     kw_required = &IdentTable.get("required");
    561     kw_returns = &IdentTable.get("returns");
    562 
    563     kw_signals = &IdentTable.get("signals");
    564     kw_qsignals = &IdentTable.get("Q_SIGNALS");
    565     kw_slots = &IdentTable.get("slots");
    566     kw_qslots = &IdentTable.get("Q_SLOTS");
    567   }
    568 
    569   // Context sensitive keywords.
    570   IdentifierInfo *kw_final;
    571   IdentifierInfo *kw_override;
    572   IdentifierInfo *kw_in;
    573   IdentifierInfo *kw_CF_ENUM;
    574   IdentifierInfo *kw_CF_OPTIONS;
    575   IdentifierInfo *kw_NS_ENUM;
    576   IdentifierInfo *kw_NS_OPTIONS;
    577   IdentifierInfo *kw___except;
    578 
    579   // JavaScript keywords.
    580   IdentifierInfo *kw_finally;
    581   IdentifierInfo *kw_function;
    582   IdentifierInfo *kw_import;
    583   IdentifierInfo *kw_let;
    584   IdentifierInfo *kw_var;
    585 
    586   // Java keywords.
    587   IdentifierInfo *kw_abstract;
    588   IdentifierInfo *kw_assert;
    589   IdentifierInfo *kw_extends;
    590   IdentifierInfo *kw_implements;
    591   IdentifierInfo *kw_instanceof;
    592   IdentifierInfo *kw_interface;
    593   IdentifierInfo *kw_native;
    594   IdentifierInfo *kw_package;
    595   IdentifierInfo *kw_synchronized;
    596   IdentifierInfo *kw_throws;
    597 
    598   // Pragma keywords.
    599   IdentifierInfo *kw_mark;
    600 
    601   // Proto keywords.
    602   IdentifierInfo *kw_extend;
    603   IdentifierInfo *kw_option;
    604   IdentifierInfo *kw_optional;
    605   IdentifierInfo *kw_repeated;
    606   IdentifierInfo *kw_required;
    607   IdentifierInfo *kw_returns;
    608 
    609   // QT keywords.
    610   IdentifierInfo *kw_signals;
    611   IdentifierInfo *kw_qsignals;
    612   IdentifierInfo *kw_slots;
    613   IdentifierInfo *kw_qslots;
    614 };
    615 
    616 } // namespace format
    617 } // namespace clang
    618 
    619 #endif
    620