forked from OSchip/llvm-project
622 lines
20 KiB
C++
622 lines
20 KiB
C++
//===--- FormatToken.h - Format C++ code ------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// \brief This file contains the declaration of the FormatToken, a wrapper
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/// around Token with additional information related to formatting.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_LIB_FORMAT_FORMATTOKEN_H
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#define LLVM_CLANG_LIB_FORMAT_FORMATTOKEN_H
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#include "clang/Basic/IdentifierTable.h"
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#include "clang/Basic/OperatorPrecedence.h"
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#include "clang/Format/Format.h"
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#include "clang/Lex/Lexer.h"
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#include <memory>
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namespace clang {
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namespace format {
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#define LIST_TOKEN_TYPES \
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TYPE(ArrayInitializerLSquare) \
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TYPE(ArraySubscriptLSquare) \
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TYPE(AttributeParen) \
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TYPE(BinaryOperator) \
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TYPE(BitFieldColon) \
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TYPE(BlockComment) \
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TYPE(CastRParen) \
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TYPE(ConditionalExpr) \
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TYPE(ConflictAlternative) \
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TYPE(ConflictEnd) \
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TYPE(ConflictStart) \
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TYPE(CtorInitializerColon) \
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TYPE(CtorInitializerComma) \
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TYPE(DesignatedInitializerPeriod) \
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TYPE(DictLiteral) \
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TYPE(ForEachMacro) \
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TYPE(FunctionAnnotationRParen) \
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TYPE(FunctionDeclarationName) \
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TYPE(FunctionLBrace) \
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TYPE(FunctionTypeLParen) \
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TYPE(ImplicitStringLiteral) \
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TYPE(InheritanceColon) \
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TYPE(InlineASMBrace) \
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TYPE(InlineASMColon) \
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TYPE(JavaAnnotation) \
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TYPE(JsComputedPropertyName) \
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TYPE(JsFatArrow) \
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TYPE(JsTypeColon) \
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TYPE(JsTypeOptionalQuestion) \
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TYPE(LambdaArrow) \
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TYPE(LambdaLSquare) \
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TYPE(LeadingJavaAnnotation) \
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TYPE(LineComment) \
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TYPE(MacroBlockBegin) \
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TYPE(MacroBlockEnd) \
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TYPE(ObjCBlockLBrace) \
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TYPE(ObjCBlockLParen) \
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TYPE(ObjCDecl) \
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TYPE(ObjCForIn) \
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TYPE(ObjCMethodExpr) \
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TYPE(ObjCMethodSpecifier) \
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TYPE(ObjCProperty) \
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TYPE(ObjCStringLiteral) \
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TYPE(OverloadedOperator) \
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TYPE(OverloadedOperatorLParen) \
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TYPE(PointerOrReference) \
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TYPE(PureVirtualSpecifier) \
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TYPE(RangeBasedForLoopColon) \
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TYPE(RegexLiteral) \
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TYPE(SelectorName) \
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TYPE(StartOfName) \
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TYPE(TemplateCloser) \
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TYPE(TemplateOpener) \
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TYPE(TemplateString) \
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TYPE(TrailingAnnotation) \
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TYPE(TrailingReturnArrow) \
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TYPE(TrailingUnaryOperator) \
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TYPE(UnaryOperator) \
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TYPE(Unknown)
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enum TokenType {
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#define TYPE(X) TT_##X,
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LIST_TOKEN_TYPES
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#undef TYPE
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NUM_TOKEN_TYPES
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};
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/// \brief Determines the name of a token type.
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const char *getTokenTypeName(TokenType Type);
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// Represents what type of block a set of braces open.
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enum BraceBlockKind { BK_Unknown, BK_Block, BK_BracedInit };
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// The packing kind of a function's parameters.
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enum ParameterPackingKind { PPK_BinPacked, PPK_OnePerLine, PPK_Inconclusive };
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enum FormatDecision { FD_Unformatted, FD_Continue, FD_Break };
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class TokenRole;
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class AnnotatedLine;
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/// \brief A wrapper around a \c Token storing information about the
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/// whitespace characters preceding it.
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struct FormatToken {
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FormatToken() {}
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/// \brief The \c Token.
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Token Tok;
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/// \brief The number of newlines immediately before the \c Token.
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///
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/// This can be used to determine what the user wrote in the original code
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/// and thereby e.g. leave an empty line between two function definitions.
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unsigned NewlinesBefore = 0;
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/// \brief Whether there is at least one unescaped newline before the \c
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/// Token.
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bool HasUnescapedNewline = false;
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/// \brief The range of the whitespace immediately preceding the \c Token.
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SourceRange WhitespaceRange;
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/// \brief The offset just past the last '\n' in this token's leading
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/// whitespace (relative to \c WhiteSpaceStart). 0 if there is no '\n'.
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unsigned LastNewlineOffset = 0;
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/// \brief The width of the non-whitespace parts of the token (or its first
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/// line for multi-line tokens) in columns.
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/// We need this to correctly measure number of columns a token spans.
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unsigned ColumnWidth = 0;
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/// \brief Contains the width in columns of the last line of a multi-line
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/// token.
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unsigned LastLineColumnWidth = 0;
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/// \brief Whether the token text contains newlines (escaped or not).
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bool IsMultiline = false;
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/// \brief Indicates that this is the first token.
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bool IsFirst = false;
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/// \brief Whether there must be a line break before this token.
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///
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/// This happens for example when a preprocessor directive ended directly
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/// before the token.
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bool MustBreakBefore = false;
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/// \brief The raw text of the token.
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///
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/// Contains the raw token text without leading whitespace and without leading
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/// escaped newlines.
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StringRef TokenText;
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/// \brief Set to \c true if this token is an unterminated literal.
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bool IsUnterminatedLiteral = 0;
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/// \brief Contains the kind of block if this token is a brace.
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BraceBlockKind BlockKind = BK_Unknown;
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TokenType Type = TT_Unknown;
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/// \brief The number of spaces that should be inserted before this token.
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unsigned SpacesRequiredBefore = 0;
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/// \brief \c true if it is allowed to break before this token.
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bool CanBreakBefore = false;
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/// \brief \c true if this is the ">" of "template<..>".
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bool ClosesTemplateDeclaration = false;
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/// \brief Number of parameters, if this is "(", "[" or "<".
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///
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/// This is initialized to 1 as we don't need to distinguish functions with
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/// 0 parameters from functions with 1 parameter. Thus, we can simply count
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/// the number of commas.
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unsigned ParameterCount = 0;
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/// \brief Number of parameters that are nested blocks,
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/// if this is "(", "[" or "<".
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unsigned BlockParameterCount = 0;
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/// \brief If this is a bracket ("<", "(", "[" or "{"), contains the kind of
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/// the surrounding bracket.
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tok::TokenKind ParentBracket = tok::unknown;
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/// \brief A token can have a special role that can carry extra information
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/// about the token's formatting.
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std::unique_ptr<TokenRole> Role;
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/// \brief If this is an opening parenthesis, how are the parameters packed?
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ParameterPackingKind PackingKind = PPK_Inconclusive;
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/// \brief The total length of the unwrapped line up to and including this
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/// token.
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unsigned TotalLength = 0;
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/// \brief The original 0-based column of this token, including expanded tabs.
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/// The configured TabWidth is used as tab width.
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unsigned OriginalColumn = 0;
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/// \brief The length of following tokens until the next natural split point,
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/// or the next token that can be broken.
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unsigned UnbreakableTailLength = 0;
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// FIXME: Come up with a 'cleaner' concept.
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/// \brief The binding strength of a token. This is a combined value of
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/// operator precedence, parenthesis nesting, etc.
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unsigned BindingStrength = 0;
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/// \brief The nesting level of this token, i.e. the number of surrounding (),
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/// [], {} or <>.
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unsigned NestingLevel = 0;
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/// \brief Penalty for inserting a line break before this token.
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unsigned SplitPenalty = 0;
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/// \brief If this is the first ObjC selector name in an ObjC method
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/// definition or call, this contains the length of the longest name.
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///
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/// This being set to 0 means that the selectors should not be colon-aligned,
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/// e.g. because several of them are block-type.
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unsigned LongestObjCSelectorName = 0;
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/// \brief Stores the number of required fake parentheses and the
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/// corresponding operator precedence.
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///
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/// If multiple fake parentheses start at a token, this vector stores them in
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/// reverse order, i.e. inner fake parenthesis first.
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SmallVector<prec::Level, 4> FakeLParens;
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/// \brief Insert this many fake ) after this token for correct indentation.
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unsigned FakeRParens = 0;
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/// \brief \c true if this token starts a binary expression, i.e. has at least
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/// one fake l_paren with a precedence greater than prec::Unknown.
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bool StartsBinaryExpression = false;
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/// \brief \c true if this token ends a binary expression.
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bool EndsBinaryExpression = false;
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/// \brief Is this is an operator (or "."/"->") in a sequence of operators
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/// with the same precedence, contains the 0-based operator index.
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unsigned OperatorIndex = 0;
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/// \brief If this is an operator (or "."/"->") in a sequence of operators
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/// with the same precedence, points to the next operator.
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FormatToken *NextOperator = nullptr;
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/// \brief Is this token part of a \c DeclStmt defining multiple variables?
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///
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/// Only set if \c Type == \c TT_StartOfName.
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bool PartOfMultiVariableDeclStmt = false;
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/// \brief If this is a bracket, this points to the matching one.
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FormatToken *MatchingParen = nullptr;
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/// \brief The previous token in the unwrapped line.
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FormatToken *Previous = nullptr;
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/// \brief The next token in the unwrapped line.
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FormatToken *Next = nullptr;
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/// \brief If this token starts a block, this contains all the unwrapped lines
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/// in it.
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SmallVector<AnnotatedLine *, 1> Children;
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/// \brief Stores the formatting decision for the token once it was made.
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FormatDecision Decision = FD_Unformatted;
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/// \brief If \c true, this token has been fully formatted (indented and
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/// potentially re-formatted inside), and we do not allow further formatting
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/// changes.
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bool Finalized = false;
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bool is(tok::TokenKind Kind) const { return Tok.is(Kind); }
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bool is(TokenType TT) const { return Type == TT; }
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bool is(const IdentifierInfo *II) const {
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return II && II == Tok.getIdentifierInfo();
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}
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bool is(tok::PPKeywordKind Kind) const {
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return Tok.getIdentifierInfo() &&
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Tok.getIdentifierInfo()->getPPKeywordID() == Kind;
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}
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template <typename A, typename B> bool isOneOf(A K1, B K2) const {
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return is(K1) || is(K2);
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}
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template <typename A, typename B, typename... Ts>
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bool isOneOf(A K1, B K2, Ts... Ks) const {
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return is(K1) || isOneOf(K2, Ks...);
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}
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template <typename T> bool isNot(T Kind) const { return !is(Kind); }
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bool isStringLiteral() const { return tok::isStringLiteral(Tok.getKind()); }
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bool isObjCAtKeyword(tok::ObjCKeywordKind Kind) const {
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return Tok.isObjCAtKeyword(Kind);
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}
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bool isAccessSpecifier(bool ColonRequired = true) const {
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return isOneOf(tok::kw_public, tok::kw_protected, tok::kw_private) &&
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(!ColonRequired || (Next && Next->is(tok::colon)));
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}
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/// \brief Determine whether the token is a simple-type-specifier.
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bool isSimpleTypeSpecifier() const;
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bool isObjCAccessSpecifier() const {
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return is(tok::at) && Next && (Next->isObjCAtKeyword(tok::objc_public) ||
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Next->isObjCAtKeyword(tok::objc_protected) ||
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Next->isObjCAtKeyword(tok::objc_package) ||
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Next->isObjCAtKeyword(tok::objc_private));
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}
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/// \brief Returns whether \p Tok is ([{ or a template opening <.
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bool opensScope() const {
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return isOneOf(tok::l_paren, tok::l_brace, tok::l_square,
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TT_TemplateOpener);
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}
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/// \brief Returns whether \p Tok is )]} or a template closing >.
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bool closesScope() const {
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return isOneOf(tok::r_paren, tok::r_brace, tok::r_square,
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TT_TemplateCloser);
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}
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/// \brief Returns \c true if this is a "." or "->" accessing a member.
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bool isMemberAccess() const {
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return isOneOf(tok::arrow, tok::period, tok::arrowstar) &&
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!isOneOf(TT_DesignatedInitializerPeriod, TT_TrailingReturnArrow,
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TT_LambdaArrow);
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}
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bool isUnaryOperator() const {
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switch (Tok.getKind()) {
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case tok::plus:
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case tok::plusplus:
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case tok::minus:
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case tok::minusminus:
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case tok::exclaim:
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case tok::tilde:
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case tok::kw_sizeof:
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case tok::kw_alignof:
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return true;
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default:
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return false;
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}
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}
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bool isBinaryOperator() const {
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// Comma is a binary operator, but does not behave as such wrt. formatting.
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return getPrecedence() > prec::Comma;
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}
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bool isTrailingComment() const {
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return is(tok::comment) &&
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(is(TT_LineComment) || !Next || Next->NewlinesBefore > 0);
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}
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/// \brief Returns \c true if this is a keyword that can be used
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/// like a function call (e.g. sizeof, typeid, ...).
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bool isFunctionLikeKeyword() const {
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switch (Tok.getKind()) {
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case tok::kw_throw:
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case tok::kw_typeid:
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case tok::kw_return:
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case tok::kw_sizeof:
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case tok::kw_alignof:
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case tok::kw_alignas:
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case tok::kw_decltype:
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case tok::kw_noexcept:
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case tok::kw_static_assert:
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case tok::kw___attribute:
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return true;
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default:
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return false;
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}
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}
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/// \brief Returns actual token start location without leading escaped
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/// newlines and whitespace.
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///
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/// This can be different to Tok.getLocation(), which includes leading escaped
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/// newlines.
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SourceLocation getStartOfNonWhitespace() const {
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return WhitespaceRange.getEnd();
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}
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prec::Level getPrecedence() const {
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return getBinOpPrecedence(Tok.getKind(), true, true);
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}
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/// \brief Returns the previous token ignoring comments.
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FormatToken *getPreviousNonComment() const {
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FormatToken *Tok = Previous;
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while (Tok && Tok->is(tok::comment))
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Tok = Tok->Previous;
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return Tok;
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}
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/// \brief Returns the next token ignoring comments.
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const FormatToken *getNextNonComment() const {
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const FormatToken *Tok = Next;
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while (Tok && Tok->is(tok::comment))
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Tok = Tok->Next;
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return Tok;
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}
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/// \brief Returns \c true if this tokens starts a block-type list, i.e. a
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/// list that should be indented with a block indent.
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bool opensBlockOrBlockTypeList(const FormatStyle &Style) const {
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return is(TT_ArrayInitializerLSquare) ||
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(is(tok::l_brace) &&
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(BlockKind == BK_Block || is(TT_DictLiteral) ||
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(!Style.Cpp11BracedListStyle && NestingLevel == 0)));
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}
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/// \brief Same as opensBlockOrBlockTypeList, but for the closing token.
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bool closesBlockOrBlockTypeList(const FormatStyle &Style) const {
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return MatchingParen && MatchingParen->opensBlockOrBlockTypeList(Style);
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}
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private:
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// Disallow copying.
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FormatToken(const FormatToken &) = delete;
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void operator=(const FormatToken &) = delete;
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};
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class ContinuationIndenter;
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struct LineState;
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class TokenRole {
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public:
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TokenRole(const FormatStyle &Style) : Style(Style) {}
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virtual ~TokenRole();
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/// \brief After the \c TokenAnnotator has finished annotating all the tokens,
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/// this function precomputes required information for formatting.
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virtual void precomputeFormattingInfos(const FormatToken *Token);
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/// \brief Apply the special formatting that the given role demands.
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///
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/// Assumes that the token having this role is already formatted.
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///
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/// Continues formatting from \p State leaving indentation to \p Indenter and
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/// returns the total penalty that this formatting incurs.
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virtual unsigned formatFromToken(LineState &State,
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ContinuationIndenter *Indenter,
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bool DryRun) {
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return 0;
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}
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/// \brief Same as \c formatFromToken, but assumes that the first token has
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/// already been set thereby deciding on the first line break.
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virtual unsigned formatAfterToken(LineState &State,
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ContinuationIndenter *Indenter,
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bool DryRun) {
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return 0;
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}
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/// \brief Notifies the \c Role that a comma was found.
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virtual void CommaFound(const FormatToken *Token) {}
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protected:
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const FormatStyle &Style;
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};
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class CommaSeparatedList : public TokenRole {
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public:
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CommaSeparatedList(const FormatStyle &Style)
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: TokenRole(Style), HasNestedBracedList(false) {}
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void precomputeFormattingInfos(const FormatToken *Token) override;
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unsigned formatAfterToken(LineState &State, ContinuationIndenter *Indenter,
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bool DryRun) override;
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unsigned formatFromToken(LineState &State, ContinuationIndenter *Indenter,
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bool DryRun) override;
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/// \brief Adds \p Token as the next comma to the \c CommaSeparated list.
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void CommaFound(const FormatToken *Token) override {
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Commas.push_back(Token);
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}
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private:
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/// \brief A struct that holds information on how to format a given list with
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/// a specific number of columns.
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struct ColumnFormat {
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/// \brief The number of columns to use.
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unsigned Columns;
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/// \brief The total width in characters.
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unsigned TotalWidth;
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/// \brief The number of lines required for this format.
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unsigned LineCount;
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/// \brief The size of each column in characters.
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SmallVector<unsigned, 8> ColumnSizes;
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};
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/// \brief Calculate which \c ColumnFormat fits best into
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/// \p RemainingCharacters.
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const ColumnFormat *getColumnFormat(unsigned RemainingCharacters) const;
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/// \brief The ordered \c FormatTokens making up the commas of this list.
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SmallVector<const FormatToken *, 8> Commas;
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/// \brief The length of each of the list's items in characters including the
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/// trailing comma.
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SmallVector<unsigned, 8> ItemLengths;
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/// \brief Precomputed formats that can be used for this list.
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SmallVector<ColumnFormat, 4> Formats;
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bool HasNestedBracedList;
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};
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/// \brief Encapsulates keywords that are context sensitive or for languages not
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/// properly supported by Clang's lexer.
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struct AdditionalKeywords {
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AdditionalKeywords(IdentifierTable &IdentTable) {
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kw_final = &IdentTable.get("final");
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kw_override = &IdentTable.get("override");
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kw_in = &IdentTable.get("in");
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kw_CF_ENUM = &IdentTable.get("CF_ENUM");
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kw_CF_OPTIONS = &IdentTable.get("CF_OPTIONS");
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kw_NS_ENUM = &IdentTable.get("NS_ENUM");
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kw_NS_OPTIONS = &IdentTable.get("NS_OPTIONS");
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kw_finally = &IdentTable.get("finally");
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kw_function = &IdentTable.get("function");
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kw_import = &IdentTable.get("import");
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kw_is = &IdentTable.get("is");
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kw_let = &IdentTable.get("let");
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kw_var = &IdentTable.get("var");
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kw_abstract = &IdentTable.get("abstract");
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kw_assert = &IdentTable.get("assert");
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kw_extends = &IdentTable.get("extends");
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kw_implements = &IdentTable.get("implements");
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kw_instanceof = &IdentTable.get("instanceof");
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kw_interface = &IdentTable.get("interface");
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kw_native = &IdentTable.get("native");
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kw_package = &IdentTable.get("package");
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kw_synchronized = &IdentTable.get("synchronized");
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kw_throws = &IdentTable.get("throws");
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kw___except = &IdentTable.get("__except");
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kw_mark = &IdentTable.get("mark");
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kw_extend = &IdentTable.get("extend");
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kw_option = &IdentTable.get("option");
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kw_optional = &IdentTable.get("optional");
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kw_repeated = &IdentTable.get("repeated");
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kw_required = &IdentTable.get("required");
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kw_returns = &IdentTable.get("returns");
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kw_signals = &IdentTable.get("signals");
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kw_qsignals = &IdentTable.get("Q_SIGNALS");
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kw_slots = &IdentTable.get("slots");
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kw_qslots = &IdentTable.get("Q_SLOTS");
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}
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// Context sensitive keywords.
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IdentifierInfo *kw_final;
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IdentifierInfo *kw_override;
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IdentifierInfo *kw_in;
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IdentifierInfo *kw_CF_ENUM;
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IdentifierInfo *kw_CF_OPTIONS;
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IdentifierInfo *kw_NS_ENUM;
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IdentifierInfo *kw_NS_OPTIONS;
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IdentifierInfo *kw___except;
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// JavaScript keywords.
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IdentifierInfo *kw_finally;
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IdentifierInfo *kw_function;
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IdentifierInfo *kw_import;
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IdentifierInfo *kw_is;
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IdentifierInfo *kw_let;
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IdentifierInfo *kw_var;
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// Java keywords.
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IdentifierInfo *kw_abstract;
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IdentifierInfo *kw_assert;
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IdentifierInfo *kw_extends;
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IdentifierInfo *kw_implements;
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IdentifierInfo *kw_instanceof;
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IdentifierInfo *kw_interface;
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IdentifierInfo *kw_native;
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IdentifierInfo *kw_package;
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IdentifierInfo *kw_synchronized;
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IdentifierInfo *kw_throws;
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// Pragma keywords.
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IdentifierInfo *kw_mark;
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// Proto keywords.
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IdentifierInfo *kw_extend;
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IdentifierInfo *kw_option;
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IdentifierInfo *kw_optional;
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IdentifierInfo *kw_repeated;
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IdentifierInfo *kw_required;
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IdentifierInfo *kw_returns;
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// QT keywords.
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IdentifierInfo *kw_signals;
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IdentifierInfo *kw_qsignals;
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IdentifierInfo *kw_slots;
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IdentifierInfo *kw_qslots;
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};
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} // namespace format
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} // namespace clang
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#endif
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