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llvm-project/clang/lib/Format/FormatToken.h

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//===--- FormatToken.h - Format C++ code ------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file contains the declaration of the FormatToken, a wrapper
/// around Token with additional information related to formatting.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LIB_FORMAT_FORMATTOKEN_H
#define LLVM_CLANG_LIB_FORMAT_FORMATTOKEN_H
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/OperatorPrecedence.h"
#include "clang/Format/Format.h"
#include "clang/Lex/Lexer.h"
#include <memory>
#include <unordered_set>
namespace clang {
namespace format {
#define LIST_TOKEN_TYPES \
TYPE(ArrayInitializerLSquare) \
TYPE(ArraySubscriptLSquare) \
TYPE(AttributeColon) \
TYPE(AttributeMacro) \
TYPE(AttributeParen) \
TYPE(AttributeSquare) \
TYPE(BinaryOperator) \
TYPE(BitFieldColon) \
TYPE(BlockComment) \
TYPE(CastRParen) \
TYPE(ConditionalExpr) \
TYPE(ConflictAlternative) \
TYPE(ConflictEnd) \
TYPE(ConflictStart) \
TYPE(ConstraintJunctions) \
TYPE(CtorInitializerColon) \
TYPE(CtorInitializerComma) \
TYPE(DesignatedInitializerLSquare) \
TYPE(DesignatedInitializerPeriod) \
TYPE(DictLiteral) \
TYPE(ForEachMacro) \
TYPE(FunctionAnnotationRParen) \
TYPE(FunctionDeclarationName) \
TYPE(FunctionLBrace) \
TYPE(FunctionTypeLParen) \
TYPE(ImplicitStringLiteral) \
TYPE(InheritanceColon) \
TYPE(InheritanceComma) \
TYPE(InlineASMBrace) \
TYPE(InlineASMColon) \
TYPE(InlineASMSymbolicNameLSquare) \
TYPE(JavaAnnotation) \
TYPE(JsComputedPropertyName) \
TYPE(JsExponentiation) \
TYPE(JsExponentiationEqual) \
TYPE(JsFatArrow) \
TYPE(JsNonNullAssertion) \
TYPE(JsNullishCoalescingOperator) \
TYPE(JsNullPropagatingOperator) \
TYPE(JsPrivateIdentifier) \
TYPE(JsTypeColon) \
TYPE(JsTypeOperator) \
TYPE(JsTypeOptionalQuestion) \
TYPE(JsAndAndEqual) \
TYPE(JsPipePipeEqual) \
TYPE(JsNullishCoalescingEqual) \
TYPE(LambdaArrow) \
TYPE(LambdaLBrace) \
TYPE(LambdaLSquare) \
TYPE(LeadingJavaAnnotation) \
TYPE(LineComment) \
TYPE(MacroBlockBegin) \
TYPE(MacroBlockEnd) \
TYPE(NamespaceMacro) \
TYPE(ObjCBlockLBrace) \
TYPE(ObjCBlockLParen) \
TYPE(ObjCDecl) \
TYPE(ObjCForIn) \
TYPE(ObjCMethodExpr) \
TYPE(ObjCMethodSpecifier) \
TYPE(ObjCProperty) \
TYPE(ObjCStringLiteral) \
TYPE(OverloadedOperator) \
TYPE(OverloadedOperatorLParen) \
TYPE(PointerOrReference) \
TYPE(PureVirtualSpecifier) \
TYPE(RangeBasedForLoopColon) \
TYPE(RegexLiteral) \
TYPE(SelectorName) \
TYPE(StartOfName) \
TYPE(StatementAttributeLikeMacro) \
TYPE(StatementMacro) \
TYPE(StructuredBindingLSquare) \
TYPE(TemplateCloser) \
TYPE(TemplateOpener) \
TYPE(TemplateString) \
TYPE(ProtoExtensionLSquare) \
TYPE(TrailingAnnotation) \
TYPE(TrailingReturnArrow) \
TYPE(TrailingUnaryOperator) \
TYPE(TypeDeclarationParen) \
TYPE(TypenameMacro) \
TYPE(UnaryOperator) \
TYPE(UntouchableMacroFunc) \
TYPE(CSharpStringLiteral) \
TYPE(CSharpNamedArgumentColon) \
TYPE(CSharpNullable) \
TYPE(CSharpNullCoalescing) \
TYPE(CSharpNullConditional) \
TYPE(CSharpNullConditionalLSquare) \
TYPE(CSharpGenericTypeConstraint) \
TYPE(CSharpGenericTypeConstraintColon) \
TYPE(CSharpGenericTypeConstraintComma) \
TYPE(Unknown)
/// Determines the semantic type of a syntactic token, e.g. whether "<" is a
/// template opener or binary operator.
enum TokenType : uint8_t {
#define TYPE(X) TT_##X,
LIST_TOKEN_TYPES
#undef TYPE
NUM_TOKEN_TYPES
};
/// Determines the name of a token type.
const char *getTokenTypeName(TokenType Type);
// Represents what type of block a set of braces open.
enum BraceBlockKind { BK_Unknown, BK_Block, BK_BracedInit };
// The packing kind of a function's parameters.
enum ParameterPackingKind { PPK_BinPacked, PPK_OnePerLine, PPK_Inconclusive };
enum FormatDecision { FD_Unformatted, FD_Continue, FD_Break };
/// Roles a token can take in a configured macro expansion.
enum MacroRole {
/// The token was expanded from a macro argument when formatting the expanded
/// token sequence.
MR_ExpandedArg,
/// The token is part of a macro argument that was previously formatted as
/// expansion when formatting the unexpanded macro call.
MR_UnexpandedArg,
/// The token was expanded from a macro definition, and is not visible as part
/// of the macro call.
MR_Hidden,
};
struct FormatToken;
/// Contains information on the token's role in a macro expansion.
///
/// Given the following definitions:
/// A(X) = [ X ]
/// B(X) = < X >
/// C(X) = X
///
/// Consider the macro call:
/// A({B(C(C(x)))}) -> [{<x>}]
///
/// In this case, the tokens of the unexpanded macro call will have the
/// following relevant entries in their macro context (note that formatting
/// the unexpanded macro call happens *after* formatting the expanded macro
/// call):
/// A( { B( C( C(x) ) ) } )
/// Role: NN U NN NN NNUN N N U N (N=None, U=UnexpandedArg)
///
/// [ { < x > } ]
/// Role: H E H E H E H (H=Hidden, E=ExpandedArg)
/// ExpandedFrom[0]: A A A A A A A
/// ExpandedFrom[1]: B B B
/// ExpandedFrom[2]: C
/// ExpandedFrom[3]: C
/// StartOfExpansion: 1 0 1 2 0 0 0
/// EndOfExpansion: 0 0 0 2 1 0 1
struct MacroExpansion {
MacroExpansion(MacroRole Role) : Role(Role) {}
/// The token's role in the macro expansion.
/// When formatting an expanded macro, all tokens that are part of macro
/// arguments will be MR_ExpandedArg, while all tokens that are not visible in
/// the macro call will be MR_Hidden.
/// When formatting an unexpanded macro call, all tokens that are part of
/// macro arguments will be MR_UnexpandedArg.
MacroRole Role;
/// The stack of macro call identifier tokens this token was expanded from.
llvm::SmallVector<FormatToken *, 1> ExpandedFrom;
/// The number of expansions of which this macro is the first entry.
unsigned StartOfExpansion = 0;
/// The number of currently open expansions in \c ExpandedFrom this macro is
/// the last token in.
unsigned EndOfExpansion = 0;
};
class TokenRole;
class AnnotatedLine;
/// A wrapper around a \c Token storing information about the
/// whitespace characters preceding it.
struct FormatToken {
FormatToken()
: HasUnescapedNewline(false), IsMultiline(false), IsFirst(false),
MustBreakBefore(false), IsUnterminatedLiteral(false),
CanBreakBefore(false), ClosesTemplateDeclaration(false),
StartsBinaryExpression(false), EndsBinaryExpression(false),
PartOfMultiVariableDeclStmt(false), ContinuesLineCommentSection(false),
Finalized(false), BlockKind(BK_Unknown), Decision(FD_Unformatted),
PackingKind(PPK_Inconclusive), Type(TT_Unknown) {}
/// The \c Token.
Token Tok;
/// The raw text of the token.
///
/// Contains the raw token text without leading whitespace and without leading
/// escaped newlines.
StringRef TokenText;
/// A token can have a special role that can carry extra information
/// about the token's formatting.
/// FIXME: Make FormatToken for parsing and AnnotatedToken two different
/// classes and make this a unique_ptr in the AnnotatedToken class.
std::shared_ptr<TokenRole> Role;
/// The range of the whitespace immediately preceding the \c Token.
SourceRange WhitespaceRange;
/// Whether there is at least one unescaped newline before the \c
/// Token.
unsigned HasUnescapedNewline : 1;
/// Whether the token text contains newlines (escaped or not).
unsigned IsMultiline : 1;
/// Indicates that this is the first token of the file.
unsigned IsFirst : 1;
/// Whether there must be a line break before this token.
///
/// This happens for example when a preprocessor directive ended directly
/// before the token.
unsigned MustBreakBefore : 1;
/// Set to \c true if this token is an unterminated literal.
unsigned IsUnterminatedLiteral : 1;
/// \c true if it is allowed to break before this token.
unsigned CanBreakBefore : 1;
/// \c true if this is the ">" of "template<..>".
unsigned ClosesTemplateDeclaration : 1;
/// \c true if this token starts a binary expression, i.e. has at least
/// one fake l_paren with a precedence greater than prec::Unknown.
unsigned StartsBinaryExpression : 1;
/// \c true if this token ends a binary expression.
unsigned EndsBinaryExpression : 1;
/// Is this token part of a \c DeclStmt defining multiple variables?
///
/// Only set if \c Type == \c TT_StartOfName.
unsigned PartOfMultiVariableDeclStmt : 1;
/// Does this line comment continue a line comment section?
///
/// Only set to true if \c Type == \c TT_LineComment.
unsigned ContinuesLineCommentSection : 1;
/// If \c true, this token has been fully formatted (indented and
/// potentially re-formatted inside), and we do not allow further formatting
/// changes.
unsigned Finalized : 1;
private:
/// Contains the kind of block if this token is a brace.
unsigned BlockKind : 2;
public:
BraceBlockKind getBlockKind() const {
return static_cast<BraceBlockKind>(BlockKind);
}
void setBlockKind(BraceBlockKind BBK) {
BlockKind = BBK;
assert(getBlockKind() == BBK && "BraceBlockKind overflow!");
}
private:
/// Stores the formatting decision for the token once it was made.
unsigned Decision : 2;
public:
FormatDecision getDecision() const {
return static_cast<FormatDecision>(Decision);
}
void setDecision(FormatDecision D) {
Decision = D;
assert(getDecision() == D && "FormatDecision overflow!");
}
private:
/// If this is an opening parenthesis, how are the parameters packed?
unsigned PackingKind : 2;
public:
ParameterPackingKind getPackingKind() const {
return static_cast<ParameterPackingKind>(PackingKind);
}
void setPackingKind(ParameterPackingKind K) {
PackingKind = K;
assert(getPackingKind() == K && "ParameterPackingKind overflow!");
}
private:
TokenType Type;
public:
/// Returns the token's type, e.g. whether "<" is a template opener or
/// binary operator.
TokenType getType() const { return Type; }
void setType(TokenType T) { Type = T; }
/// The number of newlines immediately before the \c Token.
///
/// This can be used to determine what the user wrote in the original code
/// and thereby e.g. leave an empty line between two function definitions.
unsigned NewlinesBefore = 0;
/// The offset just past the last '\n' in this token's leading
/// whitespace (relative to \c WhiteSpaceStart). 0 if there is no '\n'.
unsigned LastNewlineOffset = 0;
/// The width of the non-whitespace parts of the token (or its first
/// line for multi-line tokens) in columns.
/// We need this to correctly measure number of columns a token spans.
unsigned ColumnWidth = 0;
/// Contains the width in columns of the last line of a multi-line
/// token.
unsigned LastLineColumnWidth = 0;
/// The number of spaces that should be inserted before this token.
unsigned SpacesRequiredBefore = 0;
/// Number of parameters, if this is "(", "[" or "<".
unsigned ParameterCount = 0;
/// Number of parameters that are nested blocks,
/// if this is "(", "[" or "<".
unsigned BlockParameterCount = 0;
/// If this is a bracket ("<", "(", "[" or "{"), contains the kind of
/// the surrounding bracket.
tok::TokenKind ParentBracket = tok::unknown;
/// The total length of the unwrapped line up to and including this
/// token.
unsigned TotalLength = 0;
/// The original 0-based column of this token, including expanded tabs.
/// The configured TabWidth is used as tab width.
unsigned OriginalColumn = 0;
/// The length of following tokens until the next natural split point,
/// or the next token that can be broken.
unsigned UnbreakableTailLength = 0;
// FIXME: Come up with a 'cleaner' concept.
/// The binding strength of a token. This is a combined value of
/// operator precedence, parenthesis nesting, etc.
unsigned BindingStrength = 0;
/// The nesting level of this token, i.e. the number of surrounding (),
/// [], {} or <>.
unsigned NestingLevel = 0;
/// The indent level of this token. Copied from the surrounding line.
unsigned IndentLevel = 0;
/// Penalty for inserting a line break before this token.
unsigned SplitPenalty = 0;
/// If this is the first ObjC selector name in an ObjC method
/// definition or call, this contains the length of the longest name.
///
/// This being set to 0 means that the selectors should not be colon-aligned,
/// e.g. because several of them are block-type.
unsigned LongestObjCSelectorName = 0;
/// If this is the first ObjC selector name in an ObjC method
/// definition or call, this contains the number of parts that the whole
/// selector consist of.
unsigned ObjCSelectorNameParts = 0;
/// The 0-based index of the parameter/argument. For ObjC it is set
/// for the selector name token.
/// For now calculated only for ObjC.
unsigned ParameterIndex = 0;
/// Stores the number of required fake parentheses and the
/// corresponding operator precedence.
///
/// If multiple fake parentheses start at a token, this vector stores them in
/// reverse order, i.e. inner fake parenthesis first.
SmallVector<prec::Level, 4> FakeLParens;
/// Insert this many fake ) after this token for correct indentation.
unsigned FakeRParens = 0;
/// If this is an operator (or "."/"->") in a sequence of operators
/// with the same precedence, contains the 0-based operator index.
unsigned OperatorIndex = 0;
/// If this is an operator (or "."/"->") in a sequence of operators
/// with the same precedence, points to the next operator.
FormatToken *NextOperator = nullptr;
/// If this is a bracket, this points to the matching one.
FormatToken *MatchingParen = nullptr;
/// The previous token in the unwrapped line.
FormatToken *Previous = nullptr;
/// The next token in the unwrapped line.
FormatToken *Next = nullptr;
/// If this token starts a block, this contains all the unwrapped lines
/// in it.
SmallVector<AnnotatedLine *, 1> Children;
// Contains all attributes related to how this token takes part
// in a configured macro expansion.
llvm::Optional<MacroExpansion> MacroCtx;
bool is(tok::TokenKind Kind) const { return Tok.is(Kind); }
bool is(TokenType TT) const { return getType() == TT; }
bool is(const IdentifierInfo *II) const {
return II && II == Tok.getIdentifierInfo();
}
bool is(tok::PPKeywordKind Kind) const {
return Tok.getIdentifierInfo() &&
Tok.getIdentifierInfo()->getPPKeywordID() == Kind;
}
bool is(BraceBlockKind BBK) const { return getBlockKind() == BBK; }
bool is(ParameterPackingKind PPK) const { return getPackingKind() == PPK; }
template <typename A, typename B> bool isOneOf(A K1, B K2) const {
return is(K1) || is(K2);
}
template <typename A, typename B, typename... Ts>
bool isOneOf(A K1, B K2, Ts... Ks) const {
return is(K1) || isOneOf(K2, Ks...);
}
template <typename T> bool isNot(T Kind) const { return !is(Kind); }
bool isIf(bool AllowConstexprMacro = true) const {
return is(tok::kw_if) || endsSequence(tok::kw_constexpr, tok::kw_if) ||
(endsSequence(tok::identifier, tok::kw_if) && AllowConstexprMacro);
}
bool closesScopeAfterBlock() const {
if (getBlockKind() == BK_Block)
return true;
if (closesScope())
return Previous->closesScopeAfterBlock();
return false;
}
/// \c true if this token starts a sequence with the given tokens in order,
/// following the ``Next`` pointers, ignoring comments.
template <typename A, typename... Ts>
bool startsSequence(A K1, Ts... Tokens) const {
return startsSequenceInternal(K1, Tokens...);
}
/// \c true if this token ends a sequence with the given tokens in order,
/// following the ``Previous`` pointers, ignoring comments.
/// For example, given tokens [T1, T2, T3], the function returns true if
/// 3 tokens ending at this (ignoring comments) are [T3, T2, T1]. In other
/// words, the tokens passed to this function need to the reverse of the
/// order the tokens appear in code.
template <typename A, typename... Ts>
bool endsSequence(A K1, Ts... Tokens) const {
return endsSequenceInternal(K1, Tokens...);
}
bool isStringLiteral() const { return tok::isStringLiteral(Tok.getKind()); }
bool isObjCAtKeyword(tok::ObjCKeywordKind Kind) const {
return Tok.isObjCAtKeyword(Kind);
}
bool isAccessSpecifier(bool ColonRequired = true) const {
return isOneOf(tok::kw_public, tok::kw_protected, tok::kw_private) &&
(!ColonRequired || (Next && Next->is(tok::colon)));
}
bool canBePointerOrReferenceQualifier() const {
return isOneOf(tok::kw_const, tok::kw_restrict, tok::kw_volatile,
tok::kw___attribute, tok::kw__Nonnull, tok::kw__Nullable,
tok::kw__Null_unspecified, tok::kw___ptr32, tok::kw___ptr64,
TT_AttributeMacro);
}
/// Determine whether the token is a simple-type-specifier.
bool isSimpleTypeSpecifier() const;
bool isObjCAccessSpecifier() const {
return is(tok::at) && Next &&
(Next->isObjCAtKeyword(tok::objc_public) ||
Next->isObjCAtKeyword(tok::objc_protected) ||
Next->isObjCAtKeyword(tok::objc_package) ||
Next->isObjCAtKeyword(tok::objc_private));
}
/// Returns whether \p Tok is ([{ or an opening < of a template or in
/// protos.
bool opensScope() const {
if (is(TT_TemplateString) && TokenText.endswith("${"))
return true;
if (is(TT_DictLiteral) && is(tok::less))
return true;
return isOneOf(tok::l_paren, tok::l_brace, tok::l_square,
TT_TemplateOpener);
}
/// Returns whether \p Tok is )]} or a closing > of a template or in
/// protos.
bool closesScope() const {
if (is(TT_TemplateString) && TokenText.startswith("}"))
return true;
if (is(TT_DictLiteral) && is(tok::greater))
return true;
return isOneOf(tok::r_paren, tok::r_brace, tok::r_square,
TT_TemplateCloser);
}
/// Returns \c true if this is a "." or "->" accessing a member.
bool isMemberAccess() const {
return isOneOf(tok::arrow, tok::period, tok::arrowstar) &&
!isOneOf(TT_DesignatedInitializerPeriod, TT_TrailingReturnArrow,
TT_LambdaArrow, TT_LeadingJavaAnnotation);
}
bool isUnaryOperator() const {
switch (Tok.getKind()) {
case tok::plus:
case tok::plusplus:
case tok::minus:
case tok::minusminus:
case tok::exclaim:
case tok::tilde:
case tok::kw_sizeof:
case tok::kw_alignof:
return true;
default:
return false;
}
}
bool isBinaryOperator() const {
// Comma is a binary operator, but does not behave as such wrt. formatting.
return getPrecedence() > prec::Comma;
}
bool isTrailingComment() const {
return is(tok::comment) &&
(is(TT_LineComment) || !Next || Next->NewlinesBefore > 0);
}
/// Returns \c true if this is a keyword that can be used
/// like a function call (e.g. sizeof, typeid, ...).
bool isFunctionLikeKeyword() const {
switch (Tok.getKind()) {
case tok::kw_throw:
case tok::kw_typeid:
case tok::kw_return:
case tok::kw_sizeof:
case tok::kw_alignof:
case tok::kw_alignas:
case tok::kw_decltype:
case tok::kw_noexcept:
case tok::kw_static_assert:
case tok::kw__Atomic:
case tok::kw___attribute:
case tok::kw___underlying_type:
case tok::kw_requires:
return true;
default:
return false;
}
}
/// Returns \c true if this is a string literal that's like a label,
/// e.g. ends with "=" or ":".
bool isLabelString() const {
if (!is(tok::string_literal))
return false;
StringRef Content = TokenText;
if (Content.startswith("\"") || Content.startswith("'"))
Content = Content.drop_front(1);
if (Content.endswith("\"") || Content.endswith("'"))
Content = Content.drop_back(1);
Content = Content.trim();
return Content.size() > 1 &&
(Content.back() == ':' || Content.back() == '=');
}
/// Returns actual token start location without leading escaped
/// newlines and whitespace.
///
/// This can be different to Tok.getLocation(), which includes leading escaped
/// newlines.
SourceLocation getStartOfNonWhitespace() const {
return WhitespaceRange.getEnd();
}
prec::Level getPrecedence() const {
return getBinOpPrecedence(Tok.getKind(), /*GreaterThanIsOperator=*/true,
/*CPlusPlus11=*/true);
}
/// Returns the previous token ignoring comments.
FormatToken *getPreviousNonComment() const {
FormatToken *Tok = Previous;
while (Tok && Tok->is(tok::comment))
Tok = Tok->Previous;
return Tok;
}
/// Returns the next token ignoring comments.
const FormatToken *getNextNonComment() const {
const FormatToken *Tok = Next;
while (Tok && Tok->is(tok::comment))
Tok = Tok->Next;
return Tok;
}
/// Returns \c true if this tokens starts a block-type list, i.e. a
/// list that should be indented with a block indent.
bool opensBlockOrBlockTypeList(const FormatStyle &Style) const {
// C# Does not indent object initialisers as continuations.
if (is(tok::l_brace) && getBlockKind() == BK_BracedInit && Style.isCSharp())
return true;
if (is(TT_TemplateString) && opensScope())
return true;
return is(TT_ArrayInitializerLSquare) || is(TT_ProtoExtensionLSquare) ||
(is(tok::l_brace) &&
(getBlockKind() == BK_Block || is(TT_DictLiteral) ||
(!Style.Cpp11BracedListStyle && NestingLevel == 0))) ||
(is(tok::less) && (Style.Language == FormatStyle::LK_Proto ||
Style.Language == FormatStyle::LK_TextProto));
}
/// Returns whether the token is the left square bracket of a C++
/// structured binding declaration.
bool isCppStructuredBinding(const FormatStyle &Style) const {
if (!Style.isCpp() || isNot(tok::l_square))
return false;
const FormatToken *T = this;
do {
T = T->getPreviousNonComment();
} while (T && T->isOneOf(tok::kw_const, tok::kw_volatile, tok::amp,
tok::ampamp));
return T && T->is(tok::kw_auto);
}
/// Same as opensBlockOrBlockTypeList, but for the closing token.
bool closesBlockOrBlockTypeList(const FormatStyle &Style) const {
if (is(TT_TemplateString) && closesScope())
return true;
return MatchingParen && MatchingParen->opensBlockOrBlockTypeList(Style);
}
/// Return the actual namespace token, if this token starts a namespace
/// block.
const FormatToken *getNamespaceToken() const {
const FormatToken *NamespaceTok = this;
if (is(tok::comment))
NamespaceTok = NamespaceTok->getNextNonComment();
// Detect "(inline|export)? namespace" in the beginning of a line.
if (NamespaceTok && NamespaceTok->isOneOf(tok::kw_inline, tok::kw_export))
NamespaceTok = NamespaceTok->getNextNonComment();
return NamespaceTok &&
NamespaceTok->isOneOf(tok::kw_namespace, TT_NamespaceMacro)
? NamespaceTok
: nullptr;
}
void copyFrom(const FormatToken &Tok) { *this = Tok; }
private:
// Only allow copying via the explicit copyFrom method.
FormatToken(const FormatToken &) = delete;
FormatToken &operator=(const FormatToken &) = default;
template <typename A, typename... Ts>
bool startsSequenceInternal(A K1, Ts... Tokens) const {
if (is(tok::comment) && Next)
return Next->startsSequenceInternal(K1, Tokens...);
return is(K1) && Next && Next->startsSequenceInternal(Tokens...);
}
template <typename A> bool startsSequenceInternal(A K1) const {
if (is(tok::comment) && Next)
return Next->startsSequenceInternal(K1);
return is(K1);
}
template <typename A, typename... Ts> bool endsSequenceInternal(A K1) const {
if (is(tok::comment) && Previous)
return Previous->endsSequenceInternal(K1);
return is(K1);
}
template <typename A, typename... Ts>
bool endsSequenceInternal(A K1, Ts... Tokens) const {
if (is(tok::comment) && Previous)
return Previous->endsSequenceInternal(K1, Tokens...);
return is(K1) && Previous && Previous->endsSequenceInternal(Tokens...);
}
};
class ContinuationIndenter;
struct LineState;
class TokenRole {
public:
TokenRole(const FormatStyle &Style) : Style(Style) {}
virtual ~TokenRole();
/// After the \c TokenAnnotator has finished annotating all the tokens,
/// this function precomputes required information for formatting.
virtual void precomputeFormattingInfos(const FormatToken *Token);
/// Apply the special formatting that the given role demands.
///
/// Assumes that the token having this role is already formatted.
///
/// Continues formatting from \p State leaving indentation to \p Indenter and
/// returns the total penalty that this formatting incurs.
virtual unsigned formatFromToken(LineState &State,
ContinuationIndenter *Indenter,
bool DryRun) {
return 0;
}
/// Same as \c formatFromToken, but assumes that the first token has
/// already been set thereby deciding on the first line break.
virtual unsigned formatAfterToken(LineState &State,
ContinuationIndenter *Indenter,
bool DryRun) {
return 0;
}
/// Notifies the \c Role that a comma was found.
virtual void CommaFound(const FormatToken *Token) {}
virtual const FormatToken *lastComma() { return nullptr; }
protected:
const FormatStyle &Style;
};
class CommaSeparatedList : public TokenRole {
public:
CommaSeparatedList(const FormatStyle &Style)
: TokenRole(Style), HasNestedBracedList(false) {}
void precomputeFormattingInfos(const FormatToken *Token) override;
unsigned formatAfterToken(LineState &State, ContinuationIndenter *Indenter,
bool DryRun) override;
unsigned formatFromToken(LineState &State, ContinuationIndenter *Indenter,
bool DryRun) override;
/// Adds \p Token as the next comma to the \c CommaSeparated list.
void CommaFound(const FormatToken *Token) override {
Commas.push_back(Token);
}
const FormatToken *lastComma() override {
if (Commas.empty())
return nullptr;
return Commas.back();
}
private:
/// A struct that holds information on how to format a given list with
/// a specific number of columns.
struct ColumnFormat {
/// The number of columns to use.
unsigned Columns;
/// The total width in characters.
unsigned TotalWidth;
/// The number of lines required for this format.
unsigned LineCount;
/// The size of each column in characters.
SmallVector<unsigned, 8> ColumnSizes;
};
/// Calculate which \c ColumnFormat fits best into
/// \p RemainingCharacters.
const ColumnFormat *getColumnFormat(unsigned RemainingCharacters) const;
/// The ordered \c FormatTokens making up the commas of this list.
SmallVector<const FormatToken *, 8> Commas;
/// The length of each of the list's items in characters including the
/// trailing comma.
SmallVector<unsigned, 8> ItemLengths;
/// Precomputed formats that can be used for this list.
SmallVector<ColumnFormat, 4> Formats;
bool HasNestedBracedList;
};
/// Encapsulates keywords that are context sensitive or for languages not
/// properly supported by Clang's lexer.
struct AdditionalKeywords {
AdditionalKeywords(IdentifierTable &IdentTable) {
kw_final = &IdentTable.get("final");
kw_override = &IdentTable.get("override");
kw_in = &IdentTable.get("in");
kw_of = &IdentTable.get("of");
kw_CF_CLOSED_ENUM = &IdentTable.get("CF_CLOSED_ENUM");
kw_CF_ENUM = &IdentTable.get("CF_ENUM");
kw_CF_OPTIONS = &IdentTable.get("CF_OPTIONS");
kw_NS_CLOSED_ENUM = &IdentTable.get("NS_CLOSED_ENUM");
kw_NS_ENUM = &IdentTable.get("NS_ENUM");
kw_NS_OPTIONS = &IdentTable.get("NS_OPTIONS");
kw_as = &IdentTable.get("as");
kw_async = &IdentTable.get("async");
kw_await = &IdentTable.get("await");
kw_declare = &IdentTable.get("declare");
kw_finally = &IdentTable.get("finally");
kw_from = &IdentTable.get("from");
kw_function = &IdentTable.get("function");
kw_get = &IdentTable.get("get");
kw_import = &IdentTable.get("import");
kw_infer = &IdentTable.get("infer");
kw_is = &IdentTable.get("is");
kw_let = &IdentTable.get("let");
kw_module = &IdentTable.get("module");
kw_readonly = &IdentTable.get("readonly");
kw_set = &IdentTable.get("set");
kw_type = &IdentTable.get("type");
kw_typeof = &IdentTable.get("typeof");
kw_var = &IdentTable.get("var");
kw_yield = &IdentTable.get("yield");
kw_abstract = &IdentTable.get("abstract");
kw_assert = &IdentTable.get("assert");
kw_extends = &IdentTable.get("extends");
kw_implements = &IdentTable.get("implements");
kw_instanceof = &IdentTable.get("instanceof");
kw_interface = &IdentTable.get("interface");
kw_native = &IdentTable.get("native");
kw_package = &IdentTable.get("package");
kw_synchronized = &IdentTable.get("synchronized");
kw_throws = &IdentTable.get("throws");
kw___except = &IdentTable.get("__except");
kw___has_include = &IdentTable.get("__has_include");
kw___has_include_next = &IdentTable.get("__has_include_next");
kw_mark = &IdentTable.get("mark");
kw_extend = &IdentTable.get("extend");
kw_option = &IdentTable.get("option");
kw_optional = &IdentTable.get("optional");
kw_repeated = &IdentTable.get("repeated");
kw_required = &IdentTable.get("required");
kw_returns = &IdentTable.get("returns");
kw_signals = &IdentTable.get("signals");
kw_qsignals = &IdentTable.get("Q_SIGNALS");
kw_slots = &IdentTable.get("slots");
kw_qslots = &IdentTable.get("Q_SLOTS");
// C# keywords
kw_dollar = &IdentTable.get("dollar");
kw_base = &IdentTable.get("base");
kw_byte = &IdentTable.get("byte");
kw_checked = &IdentTable.get("checked");
kw_decimal = &IdentTable.get("decimal");
kw_delegate = &IdentTable.get("delegate");
kw_event = &IdentTable.get("event");
kw_fixed = &IdentTable.get("fixed");
kw_foreach = &IdentTable.get("foreach");
kw_implicit = &IdentTable.get("implicit");
kw_internal = &IdentTable.get("internal");
kw_lock = &IdentTable.get("lock");
kw_null = &IdentTable.get("null");
kw_object = &IdentTable.get("object");
kw_out = &IdentTable.get("out");
kw_params = &IdentTable.get("params");
kw_ref = &IdentTable.get("ref");
kw_string = &IdentTable.get("string");
kw_stackalloc = &IdentTable.get("stackalloc");
kw_sbyte = &IdentTable.get("sbyte");
kw_sealed = &IdentTable.get("sealed");
kw_uint = &IdentTable.get("uint");
kw_ulong = &IdentTable.get("ulong");
kw_unchecked = &IdentTable.get("unchecked");
kw_unsafe = &IdentTable.get("unsafe");
kw_ushort = &IdentTable.get("ushort");
kw_when = &IdentTable.get("when");
kw_where = &IdentTable.get("where");
// Keep this at the end of the constructor to make sure everything here
// is
// already initialized.
JsExtraKeywords = std::unordered_set<IdentifierInfo *>(
{kw_as, kw_async, kw_await, kw_declare, kw_finally, kw_from,
kw_function, kw_get, kw_import, kw_is, kw_let, kw_module, kw_readonly,
kw_set, kw_type, kw_typeof, kw_var, kw_yield,
// Keywords from the Java section.
kw_abstract, kw_extends, kw_implements, kw_instanceof, kw_interface});
CSharpExtraKeywords = std::unordered_set<IdentifierInfo *>(
{kw_base, kw_byte, kw_checked, kw_decimal, kw_delegate, kw_event,
kw_fixed, kw_foreach, kw_implicit, kw_in, kw_interface, kw_internal,
kw_is, kw_lock, kw_null, kw_object, kw_out, kw_override, kw_params,
kw_readonly, kw_ref, kw_string, kw_stackalloc, kw_sbyte, kw_sealed,
kw_uint, kw_ulong, kw_unchecked, kw_unsafe, kw_ushort, kw_when,
kw_where,
// Keywords from the JavaScript section.
kw_as, kw_async, kw_await, kw_declare, kw_finally, kw_from,
kw_function, kw_get, kw_import, kw_is, kw_let, kw_module, kw_readonly,
kw_set, kw_type, kw_typeof, kw_var, kw_yield,
// Keywords from the Java section.
kw_abstract, kw_extends, kw_implements, kw_instanceof, kw_interface});
}
// Context sensitive keywords.
IdentifierInfo *kw_final;
IdentifierInfo *kw_override;
IdentifierInfo *kw_in;
IdentifierInfo *kw_of;
IdentifierInfo *kw_CF_CLOSED_ENUM;
IdentifierInfo *kw_CF_ENUM;
IdentifierInfo *kw_CF_OPTIONS;
IdentifierInfo *kw_NS_CLOSED_ENUM;
IdentifierInfo *kw_NS_ENUM;
IdentifierInfo *kw_NS_OPTIONS;
IdentifierInfo *kw___except;
IdentifierInfo *kw___has_include;
IdentifierInfo *kw___has_include_next;
// JavaScript keywords.
IdentifierInfo *kw_as;
IdentifierInfo *kw_async;
IdentifierInfo *kw_await;
IdentifierInfo *kw_declare;
IdentifierInfo *kw_finally;
IdentifierInfo *kw_from;
IdentifierInfo *kw_function;
IdentifierInfo *kw_get;
IdentifierInfo *kw_import;
IdentifierInfo *kw_infer;
IdentifierInfo *kw_is;
IdentifierInfo *kw_let;
IdentifierInfo *kw_module;
IdentifierInfo *kw_readonly;
IdentifierInfo *kw_set;
IdentifierInfo *kw_type;
IdentifierInfo *kw_typeof;
IdentifierInfo *kw_var;
IdentifierInfo *kw_yield;
// Java keywords.
IdentifierInfo *kw_abstract;
IdentifierInfo *kw_assert;
IdentifierInfo *kw_extends;
IdentifierInfo *kw_implements;
IdentifierInfo *kw_instanceof;
IdentifierInfo *kw_interface;
IdentifierInfo *kw_native;
IdentifierInfo *kw_package;
IdentifierInfo *kw_synchronized;
IdentifierInfo *kw_throws;
// Pragma keywords.
IdentifierInfo *kw_mark;
// Proto keywords.
IdentifierInfo *kw_extend;
IdentifierInfo *kw_option;
IdentifierInfo *kw_optional;
IdentifierInfo *kw_repeated;
IdentifierInfo *kw_required;
IdentifierInfo *kw_returns;
// QT keywords.
IdentifierInfo *kw_signals;
IdentifierInfo *kw_qsignals;
IdentifierInfo *kw_slots;
IdentifierInfo *kw_qslots;
// C# keywords
IdentifierInfo *kw_dollar;
IdentifierInfo *kw_base;
IdentifierInfo *kw_byte;
IdentifierInfo *kw_checked;
IdentifierInfo *kw_decimal;
IdentifierInfo *kw_delegate;
IdentifierInfo *kw_event;
IdentifierInfo *kw_fixed;
IdentifierInfo *kw_foreach;
IdentifierInfo *kw_implicit;
IdentifierInfo *kw_internal;
IdentifierInfo *kw_lock;
IdentifierInfo *kw_null;
IdentifierInfo *kw_object;
IdentifierInfo *kw_out;
IdentifierInfo *kw_params;
IdentifierInfo *kw_ref;
IdentifierInfo *kw_string;
IdentifierInfo *kw_stackalloc;
IdentifierInfo *kw_sbyte;
IdentifierInfo *kw_sealed;
IdentifierInfo *kw_uint;
IdentifierInfo *kw_ulong;
IdentifierInfo *kw_unchecked;
IdentifierInfo *kw_unsafe;
IdentifierInfo *kw_ushort;
IdentifierInfo *kw_when;
IdentifierInfo *kw_where;
/// Returns \c true if \p Tok is a true JavaScript identifier, returns
/// \c false if it is a keyword or a pseudo keyword.
/// If \c AcceptIdentifierName is true, returns true not only for keywords,
// but also for IdentifierName tokens (aka pseudo-keywords), such as
// ``yield``.
bool IsJavaScriptIdentifier(const FormatToken &Tok,
bool AcceptIdentifierName = true) const {
// Based on the list of JavaScript & TypeScript keywords here:
// https://github.com/microsoft/TypeScript/blob/master/src/compiler/scanner.ts#L74
switch (Tok.Tok.getKind()) {
case tok::kw_break:
case tok::kw_case:
case tok::kw_catch:
case tok::kw_class:
case tok::kw_continue:
case tok::kw_const:
case tok::kw_default:
case tok::kw_delete:
case tok::kw_do:
case tok::kw_else:
case tok::kw_enum:
case tok::kw_export:
case tok::kw_false:
case tok::kw_for:
case tok::kw_if:
case tok::kw_import:
case tok::kw_module:
case tok::kw_new:
case tok::kw_private:
case tok::kw_protected:
case tok::kw_public:
case tok::kw_return:
case tok::kw_static:
case tok::kw_switch:
case tok::kw_this:
case tok::kw_throw:
case tok::kw_true:
case tok::kw_try:
case tok::kw_typeof:
case tok::kw_void:
case tok::kw_while:
// These are JS keywords that are lexed by LLVM/clang as keywords.
return false;
case tok::identifier: {
// For identifiers, make sure they are true identifiers, excluding the
// JavaScript pseudo-keywords (not lexed by LLVM/clang as keywords).
bool IsPseudoKeyword =
JsExtraKeywords.find(Tok.Tok.getIdentifierInfo()) !=
JsExtraKeywords.end();
return AcceptIdentifierName || !IsPseudoKeyword;
}
default:
// Other keywords are handled in the switch below, to avoid problems due
// to duplicate case labels when using the #include trick.
break;
}
switch (Tok.Tok.getKind()) {
// Handle C++ keywords not included above: these are all JS identifiers.
#define KEYWORD(X, Y) case tok::kw_##X:
#include "clang/Basic/TokenKinds.def"
// #undef KEYWORD is not needed -- it's #undef-ed at the end of
// TokenKinds.def
return true;
default:
// All other tokens (punctuation etc) are not JS identifiers.
return false;
}
}
/// Returns \c true if \p Tok is a C# keyword, returns
/// \c false if it is a anything else.
bool isCSharpKeyword(const FormatToken &Tok) const {
switch (Tok.Tok.getKind()) {
case tok::kw_bool:
case tok::kw_break:
case tok::kw_case:
case tok::kw_catch:
case tok::kw_char:
case tok::kw_class:
case tok::kw_const:
case tok::kw_continue:
case tok::kw_default:
case tok::kw_do:
case tok::kw_double:
case tok::kw_else:
case tok::kw_enum:
case tok::kw_explicit:
case tok::kw_extern:
case tok::kw_false:
case tok::kw_float:
case tok::kw_for:
case tok::kw_goto:
case tok::kw_if:
case tok::kw_int:
case tok::kw_long:
case tok::kw_namespace:
case tok::kw_new:
case tok::kw_operator:
case tok::kw_private:
case tok::kw_protected:
case tok::kw_public:
case tok::kw_return:
case tok::kw_short:
case tok::kw_sizeof:
case tok::kw_static:
case tok::kw_struct:
case tok::kw_switch:
case tok::kw_this:
case tok::kw_throw:
case tok::kw_true:
case tok::kw_try:
case tok::kw_typeof:
case tok::kw_using:
case tok::kw_virtual:
case tok::kw_void:
case tok::kw_volatile:
case tok::kw_while:
return true;
default:
return Tok.is(tok::identifier) &&
CSharpExtraKeywords.find(Tok.Tok.getIdentifierInfo()) ==
CSharpExtraKeywords.end();
}
}
private:
/// The JavaScript keywords beyond the C++ keyword set.
std::unordered_set<IdentifierInfo *> JsExtraKeywords;
/// The C# keywords beyond the C++ keyword set
std::unordered_set<IdentifierInfo *> CSharpExtraKeywords;
};
} // namespace format
} // namespace clang
#endif
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