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TokenAnnotator.cpp
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TokenAnnotator.cpp
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//===--- TokenAnnotator.cpp - Format C++ code -----------------------------===//
//
// 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 implements a token annotator, i.e. creates
/// \c AnnotatedTokens out of \c FormatTokens with required extra information.
///
//===----------------------------------------------------------------------===//
#include "TokenAnnotator.h"
#include "FormatToken.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TokenKinds.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "format-token-annotator"
namespace clang {
namespace format {
static bool mustBreakAfterAttributes(const FormatToken &Tok,
const FormatStyle &Style) {
switch (Style.BreakAfterAttributes) {
case FormatStyle::ABS_Always:
return true;
case FormatStyle::ABS_Leave:
return Tok.NewlinesBefore > 0;
default:
return false;
}
}
namespace {
/// Returns \c true if the line starts with a token that can start a statement
/// with an initializer.
static bool startsWithInitStatement(const AnnotatedLine &Line) {
return Line.startsWith(tok::kw_for) || Line.startsWith(tok::kw_if) ||
Line.startsWith(tok::kw_switch);
}
/// Returns \c true if the token can be used as an identifier in
/// an Objective-C \c \@selector, \c false otherwise.
///
/// Because getFormattingLangOpts() always lexes source code as
/// Objective-C++, C++ keywords like \c new and \c delete are
/// lexed as tok::kw_*, not tok::identifier, even for Objective-C.
///
/// For Objective-C and Objective-C++, both identifiers and keywords
/// are valid inside @selector(...) (or a macro which
/// invokes @selector(...)). So, we allow treat any identifier or
/// keyword as a potential Objective-C selector component.
static bool canBeObjCSelectorComponent(const FormatToken &Tok) {
return Tok.Tok.getIdentifierInfo();
}
/// With `Left` being '(', check if we're at either `[...](` or
/// `[...]<...>(`, where the [ opens a lambda capture list.
static bool isLambdaParameterList(const FormatToken *Left) {
// Skip <...> if present.
if (Left->Previous && Left->Previous->is(tok::greater) &&
Left->Previous->MatchingParen &&
Left->Previous->MatchingParen->is(TT_TemplateOpener)) {
Left = Left->Previous->MatchingParen;
}
// Check for `[...]`.
return Left->Previous && Left->Previous->is(tok::r_square) &&
Left->Previous->MatchingParen &&
Left->Previous->MatchingParen->is(TT_LambdaLSquare);
}
/// Returns \c true if the token is followed by a boolean condition, \c false
/// otherwise.
static bool isKeywordWithCondition(const FormatToken &Tok) {
return Tok.isOneOf(tok::kw_if, tok::kw_for, tok::kw_while, tok::kw_switch,
tok::kw_constexpr, tok::kw_catch);
}
/// Returns \c true if the token starts a C++ attribute, \c false otherwise.
static bool isCppAttribute(bool IsCpp, const FormatToken &Tok) {
if (!IsCpp || !Tok.startsSequence(tok::l_square, tok::l_square))
return false;
// The first square bracket is part of an ObjC array literal
if (Tok.Previous && Tok.Previous->is(tok::at))
return false;
const FormatToken *AttrTok = Tok.Next->Next;
if (!AttrTok)
return false;
// C++17 '[[using ns: foo, bar(baz, blech)]]'
// We assume nobody will name an ObjC variable 'using'.
if (AttrTok->startsSequence(tok::kw_using, tok::identifier, tok::colon))
return true;
if (AttrTok->isNot(tok::identifier))
return false;
while (AttrTok && !AttrTok->startsSequence(tok::r_square, tok::r_square)) {
// ObjC message send. We assume nobody will use : in a C++11 attribute
// specifier parameter, although this is technically valid:
// [[foo(:)]].
if (AttrTok->is(tok::colon) ||
AttrTok->startsSequence(tok::identifier, tok::identifier) ||
AttrTok->startsSequence(tok::r_paren, tok::identifier)) {
return false;
}
if (AttrTok->is(tok::ellipsis))
return true;
AttrTok = AttrTok->Next;
}
return AttrTok && AttrTok->startsSequence(tok::r_square, tok::r_square);
}
/// A parser that gathers additional information about tokens.
///
/// The \c TokenAnnotator tries to match parenthesis and square brakets and
/// store a parenthesis levels. It also tries to resolve matching "<" and ">"
/// into template parameter lists.
class AnnotatingParser {
public:
AnnotatingParser(const FormatStyle &Style, AnnotatedLine &Line,
const AdditionalKeywords &Keywords,
SmallVector<ScopeType> &Scopes)
: Style(Style), Line(Line), CurrentToken(Line.First), AutoFound(false),
Keywords(Keywords), Scopes(Scopes) {
Contexts.push_back(Context(tok::unknown, 1, /*IsExpression=*/false));
resetTokenMetadata();
}
private:
ScopeType getScopeType(const FormatToken &Token) const {
switch (Token.getType()) {
case TT_FunctionLBrace:
case TT_LambdaLBrace:
return ST_Function;
case TT_ClassLBrace:
case TT_StructLBrace:
case TT_UnionLBrace:
return ST_Class;
default:
return ST_Other;
}
}
bool parseAngle() {
if (!CurrentToken || !CurrentToken->Previous)
return false;
if (NonTemplateLess.count(CurrentToken->Previous) > 0)
return false;
const FormatToken &Previous = *CurrentToken->Previous; // The '<'.
if (Previous.Previous) {
if (Previous.Previous->Tok.isLiteral())
return false;
if (Previous.Previous->is(tok::r_brace))
return false;
if (Previous.Previous->is(tok::r_paren) && Contexts.size() > 1 &&
(!Previous.Previous->MatchingParen ||
Previous.Previous->MatchingParen->isNot(
TT_OverloadedOperatorLParen))) {
return false;
}
if (Previous.Previous->is(tok::kw_operator) &&
CurrentToken->is(tok::l_paren)) {
return false;
}
}
FormatToken *Left = CurrentToken->Previous;
Left->ParentBracket = Contexts.back().ContextKind;
ScopedContextCreator ContextCreator(*this, tok::less, 12);
// If this angle is in the context of an expression, we need to be more
// hesitant to detect it as opening template parameters.
bool InExprContext = Contexts.back().IsExpression;
Contexts.back().IsExpression = false;
// If there's a template keyword before the opening angle bracket, this is a
// template parameter, not an argument.
if (Left->Previous && Left->Previous->isNot(tok::kw_template))
Contexts.back().ContextType = Context::TemplateArgument;
if (Style.Language == FormatStyle::LK_Java &&
CurrentToken->is(tok::question)) {
next();
}
while (CurrentToken) {
if (CurrentToken->is(tok::greater)) {
// Try to do a better job at looking for ">>" within the condition of
// a statement. Conservatively insert spaces between consecutive ">"
// tokens to prevent splitting right bitshift operators and potentially
// altering program semantics. This check is overly conservative and
// will prevent spaces from being inserted in select nested template
// parameter cases, but should not alter program semantics.
if (CurrentToken->Next && CurrentToken->Next->is(tok::greater) &&
Left->ParentBracket != tok::less &&
CurrentToken->getStartOfNonWhitespace() ==
CurrentToken->Next->getStartOfNonWhitespace().getLocWithOffset(
-1)) {
return false;
}
Left->MatchingParen = CurrentToken;
CurrentToken->MatchingParen = Left;
// In TT_Proto, we must distignuish between:
// map<key, value>
// msg < item: data >
// msg: < item: data >
// In TT_TextProto, map<key, value> does not occur.
if (Style.Language == FormatStyle::LK_TextProto ||
(Style.Language == FormatStyle::LK_Proto && Left->Previous &&
Left->Previous->isOneOf(TT_SelectorName, TT_DictLiteral))) {
CurrentToken->setType(TT_DictLiteral);
} else {
CurrentToken->setType(TT_TemplateCloser);
CurrentToken->Tok.setLength(1);
}
if (CurrentToken->Next && CurrentToken->Next->Tok.isLiteral())
return false;
next();
return true;
}
if (CurrentToken->is(tok::question) &&
Style.Language == FormatStyle::LK_Java) {
next();
continue;
}
if (CurrentToken->isOneOf(tok::r_paren, tok::r_square, tok::r_brace) ||
(CurrentToken->isOneOf(tok::colon, tok::question) && InExprContext &&
!Style.isCSharp() && !Style.isProto())) {
return false;
}
// If a && or || is found and interpreted as a binary operator, this set
// of angles is likely part of something like "a < b && c > d". If the
// angles are inside an expression, the ||/&& might also be a binary
// operator that was misinterpreted because we are parsing template
// parameters.
// FIXME: This is getting out of hand, write a decent parser.
if (CurrentToken->Previous->isOneOf(tok::pipepipe, tok::ampamp) &&
CurrentToken->Previous->is(TT_BinaryOperator) &&
Contexts[Contexts.size() - 2].IsExpression &&
!Line.startsWith(tok::kw_template)) {
return false;
}
updateParameterCount(Left, CurrentToken);
if (Style.Language == FormatStyle::LK_Proto) {
if (FormatToken *Previous = CurrentToken->getPreviousNonComment()) {
if (CurrentToken->is(tok::colon) ||
(CurrentToken->isOneOf(tok::l_brace, tok::less) &&
Previous->isNot(tok::colon))) {
Previous->setType(TT_SelectorName);
}
}
}
if (!consumeToken())
return false;
}
return false;
}
bool parseUntouchableParens() {
while (CurrentToken) {
CurrentToken->Finalized = true;
switch (CurrentToken->Tok.getKind()) {
case tok::l_paren:
next();
if (!parseUntouchableParens())
return false;
continue;
case tok::r_paren:
next();
return true;
default:
// no-op
break;
}
next();
}
return false;
}
bool parseParens(bool LookForDecls = false) {
if (!CurrentToken)
return false;
assert(CurrentToken->Previous && "Unknown previous token");
FormatToken &OpeningParen = *CurrentToken->Previous;
assert(OpeningParen.is(tok::l_paren));
FormatToken *PrevNonComment = OpeningParen.getPreviousNonComment();
OpeningParen.ParentBracket = Contexts.back().ContextKind;
ScopedContextCreator ContextCreator(*this, tok::l_paren, 1);
// FIXME: This is a bit of a hack. Do better.
Contexts.back().ColonIsForRangeExpr =
Contexts.size() == 2 && Contexts[0].ColonIsForRangeExpr;
if (OpeningParen.Previous &&
OpeningParen.Previous->is(TT_UntouchableMacroFunc)) {
OpeningParen.Finalized = true;
return parseUntouchableParens();
}
bool StartsObjCMethodExpr = false;
if (!Style.isVerilog()) {
if (FormatToken *MaybeSel = OpeningParen.Previous) {
// @selector( starts a selector.
if (MaybeSel->isObjCAtKeyword(tok::objc_selector) &&
MaybeSel->Previous && MaybeSel->Previous->is(tok::at)) {
StartsObjCMethodExpr = true;
}
}
}
if (OpeningParen.is(TT_OverloadedOperatorLParen)) {
// Find the previous kw_operator token.
FormatToken *Prev = &OpeningParen;
while (Prev->isNot(tok::kw_operator)) {
Prev = Prev->Previous;
assert(Prev && "Expect a kw_operator prior to the OperatorLParen!");
}
// If faced with "a.operator*(argument)" or "a->operator*(argument)",
// i.e. the operator is called as a member function,
// then the argument must be an expression.
bool OperatorCalledAsMemberFunction =
Prev->Previous && Prev->Previous->isOneOf(tok::period, tok::arrow);
Contexts.back().IsExpression = OperatorCalledAsMemberFunction;
} else if (OpeningParen.is(TT_VerilogInstancePortLParen)) {
Contexts.back().IsExpression = true;
Contexts.back().ContextType = Context::VerilogInstancePortList;
} else if (Style.isJavaScript() &&
(Line.startsWith(Keywords.kw_type, tok::identifier) ||
Line.startsWith(tok::kw_export, Keywords.kw_type,
tok::identifier))) {
// type X = (...);
// export type X = (...);
Contexts.back().IsExpression = false;
} else if (OpeningParen.Previous &&
(OpeningParen.Previous->isOneOf(
tok::kw_static_assert, tok::kw_noexcept, tok::kw_explicit,
tok::kw_while, tok::l_paren, tok::comma,
TT_BinaryOperator) ||
OpeningParen.Previous->isIf())) {
// static_assert, if and while usually contain expressions.
Contexts.back().IsExpression = true;
} else if (Style.isJavaScript() && OpeningParen.Previous &&
(OpeningParen.Previous->is(Keywords.kw_function) ||
(OpeningParen.Previous->endsSequence(tok::identifier,
Keywords.kw_function)))) {
// function(...) or function f(...)
Contexts.back().IsExpression = false;
} else if (Style.isJavaScript() && OpeningParen.Previous &&
OpeningParen.Previous->is(TT_JsTypeColon)) {
// let x: (SomeType);
Contexts.back().IsExpression = false;
} else if (isLambdaParameterList(&OpeningParen)) {
// This is a parameter list of a lambda expression.
Contexts.back().IsExpression = false;
} else if (OpeningParen.is(TT_RequiresExpressionLParen)) {
Contexts.back().IsExpression = false;
} else if (OpeningParen.Previous &&
OpeningParen.Previous->is(tok::kw__Generic)) {
Contexts.back().ContextType = Context::C11GenericSelection;
Contexts.back().IsExpression = true;
} else if (Line.InPPDirective &&
(!OpeningParen.Previous ||
OpeningParen.Previous->isNot(tok::identifier))) {
Contexts.back().IsExpression = true;
} else if (Contexts[Contexts.size() - 2].CaretFound) {
// This is the parameter list of an ObjC block.
Contexts.back().IsExpression = false;
} else if (OpeningParen.Previous &&
OpeningParen.Previous->is(TT_ForEachMacro)) {
// The first argument to a foreach macro is a declaration.
Contexts.back().ContextType = Context::ForEachMacro;
Contexts.back().IsExpression = false;
} else if (OpeningParen.Previous && OpeningParen.Previous->MatchingParen &&
OpeningParen.Previous->MatchingParen->isOneOf(
TT_ObjCBlockLParen, TT_FunctionTypeLParen)) {
Contexts.back().IsExpression = false;
} else if (!Line.MustBeDeclaration && !Line.InPPDirective) {
bool IsForOrCatch =
OpeningParen.Previous &&
OpeningParen.Previous->isOneOf(tok::kw_for, tok::kw_catch);
Contexts.back().IsExpression = !IsForOrCatch;
}
// Infer the role of the l_paren based on the previous token if we haven't
// detected one yet.
if (PrevNonComment && OpeningParen.is(TT_Unknown)) {
if (PrevNonComment->isAttribute()) {
OpeningParen.setType(TT_AttributeLParen);
} else if (PrevNonComment->isOneOf(TT_TypenameMacro, tok::kw_decltype,
tok::kw_typeof,
#define TRANSFORM_TYPE_TRAIT_DEF(_, Trait) tok::kw___##Trait,
#include "clang/Basic/TransformTypeTraits.def"
tok::kw__Atomic)) {
OpeningParen.setType(TT_TypeDeclarationParen);
// decltype() and typeof() usually contain expressions.
if (PrevNonComment->isOneOf(tok::kw_decltype, tok::kw_typeof))
Contexts.back().IsExpression = true;
}
}
if (StartsObjCMethodExpr) {
Contexts.back().ColonIsObjCMethodExpr = true;
OpeningParen.setType(TT_ObjCMethodExpr);
}
// MightBeFunctionType and ProbablyFunctionType are used for
// function pointer and reference types as well as Objective-C
// block types:
//
// void (*FunctionPointer)(void);
// void (&FunctionReference)(void);
// void (&&FunctionReference)(void);
// void (^ObjCBlock)(void);
bool MightBeFunctionType = !Contexts[Contexts.size() - 2].IsExpression;
bool ProbablyFunctionType =
CurrentToken->isPointerOrReference() || CurrentToken->is(tok::caret);
bool HasMultipleLines = false;
bool HasMultipleParametersOnALine = false;
bool MightBeObjCForRangeLoop =
OpeningParen.Previous && OpeningParen.Previous->is(tok::kw_for);
FormatToken *PossibleObjCForInToken = nullptr;
while (CurrentToken) {
// LookForDecls is set when "if (" has been seen. Check for
// 'identifier' '*' 'identifier' followed by not '=' -- this
// '*' has to be a binary operator but determineStarAmpUsage() will
// categorize it as an unary operator, so set the right type here.
if (LookForDecls && CurrentToken->Next) {
FormatToken *Prev = CurrentToken->getPreviousNonComment();
if (Prev) {
FormatToken *PrevPrev = Prev->getPreviousNonComment();
FormatToken *Next = CurrentToken->Next;
if (PrevPrev && PrevPrev->is(tok::identifier) &&
PrevPrev->isNot(TT_TypeName) && Prev->isPointerOrReference() &&
CurrentToken->is(tok::identifier) && Next->isNot(tok::equal)) {
Prev->setType(TT_BinaryOperator);
LookForDecls = false;
}
}
}
if (CurrentToken->Previous->is(TT_PointerOrReference) &&
CurrentToken->Previous->Previous->isOneOf(tok::l_paren,
tok::coloncolon)) {
ProbablyFunctionType = true;
}
if (CurrentToken->is(tok::comma))
MightBeFunctionType = false;
if (CurrentToken->Previous->is(TT_BinaryOperator))
Contexts.back().IsExpression = true;
if (CurrentToken->is(tok::r_paren)) {
if (OpeningParen.isNot(TT_CppCastLParen) && MightBeFunctionType &&
ProbablyFunctionType && CurrentToken->Next &&
(CurrentToken->Next->is(tok::l_paren) ||
(CurrentToken->Next->is(tok::l_square) &&
Line.MustBeDeclaration))) {
OpeningParen.setType(OpeningParen.Next->is(tok::caret)
? TT_ObjCBlockLParen
: TT_FunctionTypeLParen);
}
OpeningParen.MatchingParen = CurrentToken;
CurrentToken->MatchingParen = &OpeningParen;
if (CurrentToken->Next && CurrentToken->Next->is(tok::l_brace) &&
OpeningParen.Previous && OpeningParen.Previous->is(tok::l_paren)) {
// Detect the case where macros are used to generate lambdas or
// function bodies, e.g.:
// auto my_lambda = MACRO((Type *type, int i) { .. body .. });
for (FormatToken *Tok = &OpeningParen; Tok != CurrentToken;
Tok = Tok->Next) {
if (Tok->is(TT_BinaryOperator) && Tok->isPointerOrReference())
Tok->setType(TT_PointerOrReference);
}
}
if (StartsObjCMethodExpr) {
CurrentToken->setType(TT_ObjCMethodExpr);
if (Contexts.back().FirstObjCSelectorName) {
Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
Contexts.back().LongestObjCSelectorName;
}
}
if (OpeningParen.is(TT_AttributeLParen))
CurrentToken->setType(TT_AttributeRParen);
if (OpeningParen.is(TT_TypeDeclarationParen))
CurrentToken->setType(TT_TypeDeclarationParen);
if (OpeningParen.Previous &&
OpeningParen.Previous->is(TT_JavaAnnotation)) {
CurrentToken->setType(TT_JavaAnnotation);
}
if (OpeningParen.Previous &&
OpeningParen.Previous->is(TT_LeadingJavaAnnotation)) {
CurrentToken->setType(TT_LeadingJavaAnnotation);
}
if (OpeningParen.Previous &&
OpeningParen.Previous->is(TT_AttributeSquare)) {
CurrentToken->setType(TT_AttributeSquare);
}
if (!HasMultipleLines)
OpeningParen.setPackingKind(PPK_Inconclusive);
else if (HasMultipleParametersOnALine)
OpeningParen.setPackingKind(PPK_BinPacked);
else
OpeningParen.setPackingKind(PPK_OnePerLine);
next();
return true;
}
if (CurrentToken->isOneOf(tok::r_square, tok::r_brace))
return false;
if (CurrentToken->is(tok::l_brace) && OpeningParen.is(TT_ObjCBlockLParen))
OpeningParen.setType(TT_Unknown);
if (CurrentToken->is(tok::comma) && CurrentToken->Next &&
!CurrentToken->Next->HasUnescapedNewline &&
!CurrentToken->Next->isTrailingComment()) {
HasMultipleParametersOnALine = true;
}
bool ProbablyFunctionTypeLParen =
(CurrentToken->is(tok::l_paren) && CurrentToken->Next &&
CurrentToken->Next->isOneOf(tok::star, tok::amp, tok::caret));
if ((CurrentToken->Previous->isOneOf(tok::kw_const, tok::kw_auto) ||
CurrentToken->Previous->isSimpleTypeSpecifier()) &&
!(CurrentToken->is(tok::l_brace) ||
(CurrentToken->is(tok::l_paren) && !ProbablyFunctionTypeLParen))) {
Contexts.back().IsExpression = false;
}
if (CurrentToken->isOneOf(tok::semi, tok::colon)) {
MightBeObjCForRangeLoop = false;
if (PossibleObjCForInToken) {
PossibleObjCForInToken->setType(TT_Unknown);
PossibleObjCForInToken = nullptr;
}
}
if (MightBeObjCForRangeLoop && CurrentToken->is(Keywords.kw_in)) {
PossibleObjCForInToken = CurrentToken;
PossibleObjCForInToken->setType(TT_ObjCForIn);
}
// When we discover a 'new', we set CanBeExpression to 'false' in order to
// parse the type correctly. Reset that after a comma.
if (CurrentToken->is(tok::comma))
Contexts.back().CanBeExpression = true;
FormatToken *Tok = CurrentToken;
if (!consumeToken())
return false;
updateParameterCount(&OpeningParen, Tok);
if (CurrentToken && CurrentToken->HasUnescapedNewline)
HasMultipleLines = true;
}
return false;
}
bool isCSharpAttributeSpecifier(const FormatToken &Tok) {
if (!Style.isCSharp())
return false;
// `identifier[i]` is not an attribute.
if (Tok.Previous && Tok.Previous->is(tok::identifier))
return false;
// Chains of [] in `identifier[i][j][k]` are not attributes.
if (Tok.Previous && Tok.Previous->is(tok::r_square)) {
auto *MatchingParen = Tok.Previous->MatchingParen;
if (!MatchingParen || MatchingParen->is(TT_ArraySubscriptLSquare))
return false;
}
const FormatToken *AttrTok = Tok.Next;
if (!AttrTok)
return false;
// Just an empty declaration e.g. string [].
if (AttrTok->is(tok::r_square))
return false;
// Move along the tokens inbetween the '[' and ']' e.g. [STAThread].
while (AttrTok && AttrTok->isNot(tok::r_square))
AttrTok = AttrTok->Next;
if (!AttrTok)
return false;
// Allow an attribute to be the only content of a file.
AttrTok = AttrTok->Next;
if (!AttrTok)
return true;
// Limit this to being an access modifier that follows.
if (AttrTok->isOneOf(tok::kw_public, tok::kw_private, tok::kw_protected,
tok::comment, tok::kw_class, tok::kw_static,
tok::l_square, Keywords.kw_internal)) {
return true;
}
// incase its a [XXX] retval func(....
if (AttrTok->Next &&
AttrTok->Next->startsSequence(tok::identifier, tok::l_paren)) {
return true;
}
return false;
}
bool parseSquare() {
if (!CurrentToken)
return false;
// A '[' could be an index subscript (after an identifier or after
// ')' or ']'), it could be the start of an Objective-C method
// expression, it could the start of an Objective-C array literal,
// or it could be a C++ attribute specifier [[foo::bar]].
FormatToken *Left = CurrentToken->Previous;
Left->ParentBracket = Contexts.back().ContextKind;
FormatToken *Parent = Left->getPreviousNonComment();
// Cases where '>' is followed by '['.
// In C++, this can happen either in array of templates (foo<int>[10])
// or when array is a nested template type (unique_ptr<type1<type2>[]>).
bool CppArrayTemplates =
Style.isCpp() && Parent && Parent->is(TT_TemplateCloser) &&
(Contexts.back().CanBeExpression || Contexts.back().IsExpression ||
Contexts.back().ContextType == Context::TemplateArgument);
const bool IsInnerSquare = Contexts.back().InCpp11AttributeSpecifier;
const bool IsCpp11AttributeSpecifier =
isCppAttribute(Style.isCpp(), *Left) || IsInnerSquare;
// Treat C# Attributes [STAThread] much like C++ attributes [[...]].
bool IsCSharpAttributeSpecifier =
isCSharpAttributeSpecifier(*Left) ||
Contexts.back().InCSharpAttributeSpecifier;
bool InsideInlineASM = Line.startsWith(tok::kw_asm);
bool IsCppStructuredBinding = Left->isCppStructuredBinding(Style);
bool StartsObjCMethodExpr =
!IsCppStructuredBinding && !InsideInlineASM && !CppArrayTemplates &&
Style.isCpp() && !IsCpp11AttributeSpecifier &&
!IsCSharpAttributeSpecifier && Contexts.back().CanBeExpression &&
Left->isNot(TT_LambdaLSquare) &&
!CurrentToken->isOneOf(tok::l_brace, tok::r_square) &&
(!Parent ||
Parent->isOneOf(tok::colon, tok::l_square, tok::l_paren,
tok::kw_return, tok::kw_throw) ||
Parent->isUnaryOperator() ||
// FIXME(bug 36976): ObjC return types shouldn't use TT_CastRParen.
Parent->isOneOf(TT_ObjCForIn, TT_CastRParen) ||
(getBinOpPrecedence(Parent->Tok.getKind(), true, true) >
prec::Unknown));
bool ColonFound = false;
unsigned BindingIncrease = 1;
if (IsCppStructuredBinding) {
Left->setType(TT_StructuredBindingLSquare);
} else if (Left->is(TT_Unknown)) {
if (StartsObjCMethodExpr) {
Left->setType(TT_ObjCMethodExpr);
} else if (InsideInlineASM) {
Left->setType(TT_InlineASMSymbolicNameLSquare);
} else if (IsCpp11AttributeSpecifier) {
Left->setType(TT_AttributeSquare);
if (!IsInnerSquare && Left->Previous)
Left->Previous->EndsCppAttributeGroup = false;
} else if (Style.isJavaScript() && Parent &&
Contexts.back().ContextKind == tok::l_brace &&
Parent->isOneOf(tok::l_brace, tok::comma)) {
Left->setType(TT_JsComputedPropertyName);
} else if (Style.isCpp() && Contexts.back().ContextKind == tok::l_brace &&
Parent && Parent->isOneOf(tok::l_brace, tok::comma)) {
Left->setType(TT_DesignatedInitializerLSquare);
} else if (IsCSharpAttributeSpecifier) {
Left->setType(TT_AttributeSquare);
} else if (CurrentToken->is(tok::r_square) && Parent &&
Parent->is(TT_TemplateCloser)) {
Left->setType(TT_ArraySubscriptLSquare);
} else if (Style.isProto()) {
// Square braces in LK_Proto can either be message field attributes:
//
// optional Aaa aaa = 1 [
// (aaa) = aaa
// ];
//
// extensions 123 [
// (aaa) = aaa
// ];
//
// or text proto extensions (in options):
//
// option (Aaa.options) = {
// [type.type/type] {
// key: value
// }
// }
//
// or repeated fields (in options):
//
// option (Aaa.options) = {
// keys: [ 1, 2, 3 ]
// }
//
// In the first and the third case we want to spread the contents inside
// the square braces; in the second we want to keep them inline.
Left->setType(TT_ArrayInitializerLSquare);
if (!Left->endsSequence(tok::l_square, tok::numeric_constant,
tok::equal) &&
!Left->endsSequence(tok::l_square, tok::numeric_constant,
tok::identifier) &&
!Left->endsSequence(tok::l_square, tok::colon, TT_SelectorName)) {
Left->setType(TT_ProtoExtensionLSquare);
BindingIncrease = 10;
}
} else if (!CppArrayTemplates && Parent &&
Parent->isOneOf(TT_BinaryOperator, TT_TemplateCloser, tok::at,
tok::comma, tok::l_paren, tok::l_square,
tok::question, tok::colon, tok::kw_return,
// Should only be relevant to JavaScript:
tok::kw_default)) {
Left->setType(TT_ArrayInitializerLSquare);
} else {
BindingIncrease = 10;
Left->setType(TT_ArraySubscriptLSquare);
}
}
ScopedContextCreator ContextCreator(*this, tok::l_square, BindingIncrease);
Contexts.back().IsExpression = true;
if (Style.isJavaScript() && Parent && Parent->is(TT_JsTypeColon))
Contexts.back().IsExpression = false;
Contexts.back().ColonIsObjCMethodExpr = StartsObjCMethodExpr;
Contexts.back().InCpp11AttributeSpecifier = IsCpp11AttributeSpecifier;
Contexts.back().InCSharpAttributeSpecifier = IsCSharpAttributeSpecifier;
while (CurrentToken) {
if (CurrentToken->is(tok::r_square)) {
if (IsCpp11AttributeSpecifier) {
CurrentToken->setType(TT_AttributeSquare);
if (!IsInnerSquare)
CurrentToken->EndsCppAttributeGroup = true;
}
if (IsCSharpAttributeSpecifier) {
CurrentToken->setType(TT_AttributeSquare);
} else if (((CurrentToken->Next &&
CurrentToken->Next->is(tok::l_paren)) ||
(CurrentToken->Previous &&
CurrentToken->Previous->Previous == Left)) &&
Left->is(TT_ObjCMethodExpr)) {
// An ObjC method call is rarely followed by an open parenthesis. It
// also can't be composed of just one token, unless it's a macro that
// will be expanded to more tokens.
// FIXME: Do we incorrectly label ":" with this?
StartsObjCMethodExpr = false;
Left->setType(TT_Unknown);
}
if (StartsObjCMethodExpr && CurrentToken->Previous != Left) {
CurrentToken->setType(TT_ObjCMethodExpr);
// If we haven't seen a colon yet, make sure the last identifier
// before the r_square is tagged as a selector name component.
if (!ColonFound && CurrentToken->Previous &&
CurrentToken->Previous->is(TT_Unknown) &&
canBeObjCSelectorComponent(*CurrentToken->Previous)) {
CurrentToken->Previous->setType(TT_SelectorName);
}
// determineStarAmpUsage() thinks that '*' '[' is allocating an
// array of pointers, but if '[' starts a selector then '*' is a
// binary operator.
if (Parent && Parent->is(TT_PointerOrReference))
Parent->overwriteFixedType(TT_BinaryOperator);
}
// An arrow after an ObjC method expression is not a lambda arrow.
if (CurrentToken->getType() == TT_ObjCMethodExpr &&
CurrentToken->Next &&
CurrentToken->Next->is(TT_TrailingReturnArrow)) {
CurrentToken->Next->overwriteFixedType(TT_Unknown);
}
Left->MatchingParen = CurrentToken;
CurrentToken->MatchingParen = Left;
// FirstObjCSelectorName is set when a colon is found. This does
// not work, however, when the method has no parameters.
// Here, we set FirstObjCSelectorName when the end of the method call is
// reached, in case it was not set already.
if (!Contexts.back().FirstObjCSelectorName) {
FormatToken *Previous = CurrentToken->getPreviousNonComment();
if (Previous && Previous->is(TT_SelectorName)) {
Previous->ObjCSelectorNameParts = 1;
Contexts.back().FirstObjCSelectorName = Previous;
}
} else {
Left->ParameterCount =
Contexts.back().FirstObjCSelectorName->ObjCSelectorNameParts;
}
if (Contexts.back().FirstObjCSelectorName) {
Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
Contexts.back().LongestObjCSelectorName;
if (Left->BlockParameterCount > 1)
Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName = 0;
}
next();
return true;
}
if (CurrentToken->isOneOf(tok::r_paren, tok::r_brace))
return false;
if (CurrentToken->is(tok::colon)) {
if (IsCpp11AttributeSpecifier &&
CurrentToken->endsSequence(tok::colon, tok::identifier,
tok::kw_using)) {
// Remember that this is a [[using ns: foo]] C++ attribute, so we
// don't add a space before the colon (unlike other colons).
CurrentToken->setType(TT_AttributeColon);
} else if (!Style.isVerilog() && !Line.InPragmaDirective &&
Left->isOneOf(TT_ArraySubscriptLSquare,
TT_DesignatedInitializerLSquare)) {
Left->setType(TT_ObjCMethodExpr);
StartsObjCMethodExpr = true;
Contexts.back().ColonIsObjCMethodExpr = true;
if (Parent && Parent->is(tok::r_paren)) {
// FIXME(bug 36976): ObjC return types shouldn't use TT_CastRParen.
Parent->setType(TT_CastRParen);
}
}
ColonFound = true;
}
if (CurrentToken->is(tok::comma) && Left->is(TT_ObjCMethodExpr) &&
!ColonFound) {
Left->setType(TT_ArrayInitializerLSquare);
}
FormatToken *Tok = CurrentToken;
if (!consumeToken())
return false;
updateParameterCount(Left, Tok);
}
return false;
}
bool couldBeInStructArrayInitializer() const {
if (Contexts.size() < 2)
return false;
// We want to back up no more then 2 context levels i.e.
// . { { <-
const auto End = std::next(Contexts.rbegin(), 2);
auto Last = Contexts.rbegin();
unsigned Depth = 0;
for (; Last != End; ++Last)
if (Last->ContextKind == tok::l_brace)
++Depth;
return Depth == 2 && Last->ContextKind != tok::l_brace;
}
bool parseBrace() {
if (!CurrentToken)
return true;
assert(CurrentToken->Previous);
FormatToken &OpeningBrace = *CurrentToken->Previous;
assert(OpeningBrace.is(tok::l_brace));
OpeningBrace.ParentBracket = Contexts.back().ContextKind;
if (Contexts.back().CaretFound)
OpeningBrace.overwriteFixedType(TT_ObjCBlockLBrace);
Contexts.back().CaretFound = false;
ScopedContextCreator ContextCreator(*this, tok::l_brace, 1);
Contexts.back().ColonIsDictLiteral = true;
if (OpeningBrace.is(BK_BracedInit))
Contexts.back().IsExpression = true;
if (Style.isJavaScript() && OpeningBrace.Previous &&
OpeningBrace.Previous->is(TT_JsTypeColon)) {
Contexts.back().IsExpression = false;
}
if (Style.isVerilog() &&
(!OpeningBrace.getPreviousNonComment() ||
OpeningBrace.getPreviousNonComment()->isNot(Keywords.kw_apostrophe))) {
Contexts.back().VerilogMayBeConcatenation = true;
}
unsigned CommaCount = 0;
while (CurrentToken) {
if (CurrentToken->is(tok::r_brace)) {
assert(!Scopes.empty());
assert(Scopes.back() == getScopeType(OpeningBrace));
Scopes.pop_back();
assert(OpeningBrace.Optional == CurrentToken->Optional);
OpeningBrace.MatchingParen = CurrentToken;
CurrentToken->MatchingParen = &OpeningBrace;
if (Style.AlignArrayOfStructures != FormatStyle::AIAS_None) {
if (OpeningBrace.ParentBracket == tok::l_brace &&
couldBeInStructArrayInitializer() && CommaCount > 0) {
Contexts.back().ContextType = Context::StructArrayInitializer;
}
}
next();
return true;
}
if (CurrentToken->isOneOf(tok::r_paren, tok::r_square))
return false;
updateParameterCount(&OpeningBrace, CurrentToken);
if (CurrentToken->isOneOf(tok::colon, tok::l_brace, tok::less)) {
FormatToken *Previous = CurrentToken->getPreviousNonComment();
if (Previous->is(TT_JsTypeOptionalQuestion))
Previous = Previous->getPreviousNonComment();
if ((CurrentToken->is(tok::colon) &&
(!Contexts.back().ColonIsDictLiteral || !Style.isCpp())) ||
Style.isProto()) {
OpeningBrace.setType(TT_DictLiteral);
if (Previous->Tok.getIdentifierInfo() ||
Previous->is(tok::string_literal)) {
Previous->setType(TT_SelectorName);
}
}
if (CurrentToken->is(tok::colon) && OpeningBrace.is(TT_Unknown))
OpeningBrace.setType(TT_DictLiteral);
else if (Style.isJavaScript())
OpeningBrace.overwriteFixedType(TT_DictLiteral);
}
if (CurrentToken->is(tok::comma)) {
if (Style.isJavaScript())
OpeningBrace.overwriteFixedType(TT_DictLiteral);
++CommaCount;
}
if (!consumeToken())
return false;
}
return true;
}
void updateParameterCount(FormatToken *Left, FormatToken *Current) {
// For ObjC methods, the number of parameters is calculated differently as
// method declarations have a different structure (the parameters are not
// inside a bracket scope).
if (Current->is(tok::l_brace) && Current->is(BK_Block))
++Left->BlockParameterCount;
if (Current->is(tok::comma)) {
++Left->ParameterCount;
if (!Left->Role)
Left->Role.reset(new CommaSeparatedList(Style));
Left->Role->CommaFound(Current);
} else if (Left->ParameterCount == 0 && Current->isNot(tok::comment)) {
Left->ParameterCount = 1;
}
}
bool parseConditional() {
while (CurrentToken) {
if (CurrentToken->is(tok::colon)) {
CurrentToken->setType(TT_ConditionalExpr);
next();
return true;
}
if (!consumeToken())
return false;
}
return false;
}
bool parseTemplateDeclaration() {
if (CurrentToken && CurrentToken->is(tok::less)) {
CurrentToken->setType(TT_TemplateOpener);
next();
if (!parseAngle())
return false;
if (CurrentToken)
CurrentToken->Previous->ClosesTemplateDeclaration = true;
return true;
}
return false;
}
bool consumeToken() {
if (Style.isCpp()) {
const auto *Prev = CurrentToken->getPreviousNonComment();
if (Prev && Prev->is(tok::r_square) && Prev->is(TT_AttributeSquare) &&
CurrentToken->isOneOf(tok::kw_if, tok::kw_switch, tok::kw_case,
tok::kw_default, tok::kw_for, tok::kw_while) &&
mustBreakAfterAttributes(*CurrentToken, Style)) {
CurrentToken->MustBreakBefore = true;
}
}
FormatToken *Tok = CurrentToken;
next();
// In Verilog primitives' state tables, `:`, `?`, and `-` aren't normal
// operators.
if (Tok->is(TT_VerilogTableItem))
return true;
switch (Tok->Tok.getKind()) {
case tok::plus:
case tok::minus:
if (!Tok->Previous && Line.MustBeDeclaration)
Tok->setType(TT_ObjCMethodSpecifier);
break;
case tok::colon:
if (!Tok->Previous)
return false;