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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.
// FIXME: this doesn't cover attributes/constraints before the l_paren.
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),
IsCpp(Style.isCpp()), LangOpts(getFormattingLangOpts(Style)),
Keywords(Keywords), Scopes(Scopes), TemplateDeclarationDepth(0) {
Contexts.push_back(Context(tok::unknown, 1, /*IsExpression=*/false));
resetTokenMetadata();
}
private:
ScopeType getScopeType(const FormatToken &Token) const {
switch (Token.getType()) {
case TT_ClassLBrace:
case TT_StructLBrace:
case TT_UnionLBrace:
return ST_Class;
case TT_CompoundRequirementLBrace:
return ST_CompoundRequirement;
default:
return ST_Other;
}
}
bool parseAngle() {
if (!CurrentToken)
return false;
auto *Left = CurrentToken->Previous; // The '<'.
if (!Left)
return false;
if (NonTemplateLess.count(Left) > 0)
return false;
const auto *BeforeLess = Left->Previous;
if (BeforeLess) {
if (BeforeLess->Tok.isLiteral())
return false;
if (BeforeLess->is(tok::r_brace))
return false;
if (BeforeLess->is(tok::r_paren) && Contexts.size() > 1 &&
!(BeforeLess->MatchingParen &&
BeforeLess->MatchingParen->is(TT_OverloadedOperatorLParen))) {
return false;
}
if (BeforeLess->is(tok::kw_operator) && CurrentToken->is(tok::l_paren))
return false;
}
Left->ParentBracket = Contexts.back().ContextKind;
ScopedContextCreator ContextCreator(*this, tok::less, 12);
Contexts.back().IsExpression = false;
// If there's a template keyword before the opening angle bracket, this is a
// template parameter, not an argument.
if (BeforeLess && BeforeLess->isNot(tok::kw_template))
Contexts.back().ContextType = Context::TemplateArgument;
if (Style.isJava() && CurrentToken->is(tok::question))
next();
for (bool SeenTernaryOperator = false, MaybeAngles = true; CurrentToken;) {
const bool InExpr = Contexts[Contexts.size() - 2].IsExpression;
if (CurrentToken->is(tok::greater)) {
const auto *Next = CurrentToken->Next;
if (CurrentToken->isNot(TT_TemplateCloser)) {
// 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 shift 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 (Next && Next->is(tok::greater) &&
Left->ParentBracket != tok::less &&
CurrentToken->getStartOfNonWhitespace() ==
Next->getStartOfNonWhitespace().getLocWithOffset(-1)) {
return false;
}
if (InExpr && SeenTernaryOperator &&
(!Next || !Next->isOneOf(tok::l_paren, tok::l_brace))) {
return false;
}
if (!MaybeAngles)
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.isTextProto() ||
(Style.Language == FormatStyle::LK_Proto && BeforeLess &&
BeforeLess->isOneOf(TT_SelectorName, TT_DictLiteral))) {
CurrentToken->setType(TT_DictLiteral);
} else {
CurrentToken->setType(TT_TemplateCloser);
CurrentToken->Tok.setLength(1);
}
if (Next && Next->Tok.isLiteral())
return false;
next();
return true;
}
if (BeforeLess && BeforeLess->is(TT_TemplateName)) {
next();
continue;
}
if (CurrentToken->is(tok::question) && Style.isJava()) {
next();
continue;
}
if (CurrentToken->isOneOf(tok::r_paren, tok::r_square, tok::r_brace))
return false;
const auto &Prev = *CurrentToken->Previous;
// 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 (MaybeAngles && InExpr && !Line.startsWith(tok::kw_template) &&
Prev.is(TT_BinaryOperator) &&
Prev.isOneOf(tok::pipepipe, tok::ampamp)) {
MaybeAngles = false;
}
if (Prev.isOneOf(tok::question, tok::colon) && !Style.isProto())
SeenTernaryOperator = true;
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 (Style.isTableGen()) {
if (CurrentToken->isOneOf(tok::comma, tok::equal)) {
// They appear as separators. Unless they are not in class definition.
next();
continue;
}
// In angle, there must be Value like tokens. Types are also able to be
// parsed in the same way with Values.
if (!parseTableGenValue())
return false;
continue;
}
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 IsIf = 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->is(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_CastRParen,
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.
OpeningParen.setType(TT_LambdaDefinitionLParen);
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 || (Line.InMacroBody && !Scopes.empty()))) {
bool IsForOrCatch =
OpeningParen.Previous &&
OpeningParen.Previous->isOneOf(tok::kw_for, tok::kw_catch);
Contexts.back().IsExpression = !IsForOrCatch;
}
if (Style.isTableGen()) {
if (FormatToken *Prev = OpeningParen.Previous) {
if (Prev->is(TT_TableGenCondOperator)) {
Contexts.back().IsTableGenCondOpe = true;
Contexts.back().IsExpression = true;
} else if (Contexts.size() > 1 &&
Contexts[Contexts.size() - 2].IsTableGenBangOpe) {
// Hack to handle bang operators. The parent context's flag
// was set by parseTableGenSimpleValue().
// We have to specify the context outside because the prev of "(" may
// be ">", not the bang operator in this case.
Contexts.back().IsTableGenBangOpe = true;
Contexts.back().IsExpression = true;
} else {
// Otherwise, this paren seems DAGArg.
if (!parseTableGenDAGArg())
return false;
return parseTableGenDAGArgAndList(&OpeningParen);
}
}
}
// 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) {
const auto &Prev = *CurrentToken->Previous;
const auto *PrevPrev = Prev.Previous;
if (Prev.is(TT_PointerOrReference) &&
PrevPrev->isOneOf(tok::l_paren, tok::coloncolon)) {
ProbablyFunctionType = true;
}
if (CurrentToken->is(tok::comma))
MightBeFunctionType = false;
if (Prev.is(TT_BinaryOperator))
Contexts.back().IsExpression = true;
if (CurrentToken->is(tok::r_paren)) {
if (Prev.is(TT_PointerOrReference) &&
(PrevPrev == &OpeningParen || PrevPrev->is(tok::coloncolon))) {
MightBeFunctionType = true;
}
if (OpeningParen.isNot(TT_CppCastLParen) && MightBeFunctionType &&
ProbablyFunctionType && CurrentToken->Next &&
(CurrentToken->Next->is(tok::l_paren) ||
(CurrentToken->Next->is(tok::l_square) &&
(Line.MustBeDeclaration ||
(PrevNonComment && PrevNonComment->isTypeName(LangOpts)))))) {
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 ((Prev.isOneOf(tok::kw_const, tok::kw_auto) ||
Prev.isTypeName(LangOpts)) &&
!(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 (IsIf && CurrentToken->is(tok::semi)) {
for (auto *Tok = OpeningParen.Next;
Tok != CurrentToken &&
!Tok->isOneOf(tok::equal, tok::l_paren, tok::l_brace);
Tok = Tok->Next) {
if (Tok->isPointerOrReference())
Tok->setFinalizedType(TT_PointerOrReference);
}
}
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;
if (Style.isTableGen()) {
if (CurrentToken->is(tok::comma)) {
if (Contexts.back().IsTableGenCondOpe)
CurrentToken->setType(TT_TableGenCondOperatorComma);
next();
} else if (CurrentToken->is(tok::colon)) {
if (Contexts.back().IsTableGenCondOpe)
CurrentToken->setType(TT_TableGenCondOperatorColon);
next();
}
// In TableGen there must be Values in parens.
if (!parseTableGenValue())
return false;
continue;
}
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->isAccessSpecifierKeyword() ||
AttrTok->isOneOf(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 =
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(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(IsCpp);
bool StartsObjCMethodExpr =
!IsCppStructuredBinding && !InsideInlineASM && !CppArrayTemplates &&
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 (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->is(TT_ObjCMethodExpr) && CurrentToken->Next &&
CurrentToken->Next->is(TT_LambdaArrow)) {
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;
}
if (Style.isTableGen() && Left->is(TT_TableGenListOpener))
CurrentToken->setType(TT_TableGenListCloser);
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 (Style.isTableGen()) {
if (CurrentToken->isOneOf(tok::comma, tok::minus, tok::ellipsis)) {
// '-' and '...' appears as a separator in slice.
next();
} else {
// In TableGen there must be a list of Values in square brackets.
// It must be ValueList or SliceElements.
if (!parseTableGenValue())
return false;
}
updateParameterCount(Left, Tok);
continue;
}
if (!consumeToken())
return false;
updateParameterCount(Left, Tok);
}
return false;
}
void skipToNextNonComment() {
next();
while (CurrentToken && CurrentToken->is(tok::comment))
next();
}
// Simplified parser for TableGen Value. Returns true on success.
// It consists of SimpleValues, SimpleValues with Suffixes, and Value followed
// by '#', paste operator.
// There also exists the case the Value is parsed as NameValue.
// In this case, the Value ends if '{' is found.
bool parseTableGenValue(bool ParseNameMode = false) {
if (!CurrentToken)
return false;
while (CurrentToken->is(tok::comment))
next();
if (!parseTableGenSimpleValue())
return false;
if (!CurrentToken)
return true;
// Value "#" [Value]
if (CurrentToken->is(tok::hash)) {
if (CurrentToken->Next &&
CurrentToken->Next->isOneOf(tok::colon, tok::semi, tok::l_brace)) {
// Trailing paste operator.
// These are only the allowed cases in TGParser::ParseValue().
CurrentToken->setType(TT_TableGenTrailingPasteOperator);
next();
return true;
}
FormatToken *HashTok = CurrentToken;
skipToNextNonComment();
HashTok->setType(TT_Unknown);
if (!parseTableGenValue(ParseNameMode))
return false;
if (!CurrentToken)
return true;
}
// In name mode, '{' is regarded as the end of the value.
// See TGParser::ParseValue in TGParser.cpp
if (ParseNameMode && CurrentToken->is(tok::l_brace))
return true;
// These tokens indicates this is a value with suffixes.
if (CurrentToken->isOneOf(tok::l_brace, tok::l_square, tok::period)) {
CurrentToken->setType(TT_TableGenValueSuffix);
FormatToken *Suffix = CurrentToken;
skipToNextNonComment();
if (Suffix->is(tok::l_square))
return parseSquare();
if (Suffix->is(tok::l_brace)) {
Scopes.push_back(getScopeType(*Suffix));
return parseBrace();
}
}
return true;
}
// TokVarName ::= "$" ualpha (ualpha | "0"..."9")*
// Appears as a part of DagArg.
// This does not change the current token on fail.
bool tryToParseTableGenTokVar() {
if (!CurrentToken)
return false;
if (CurrentToken->is(tok::identifier) &&
CurrentToken->TokenText.front() == '$') {
skipToNextNonComment();
return true;
}
return false;
}
// DagArg ::= Value [":" TokVarName] | TokVarName
// Appears as a part of SimpleValue6.
bool parseTableGenDAGArg(bool AlignColon = false) {
if (tryToParseTableGenTokVar())
return true;
if (parseTableGenValue()) {
if (CurrentToken && CurrentToken->is(tok::colon)) {
if (AlignColon)
CurrentToken->setType(TT_TableGenDAGArgListColonToAlign);
else
CurrentToken->setType(TT_TableGenDAGArgListColon);
skipToNextNonComment();
return tryToParseTableGenTokVar();
}
return true;
}
return false;