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llvm-project/clang/lib/Format/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 {
namespace {
/// 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() != nullptr;
}
/// 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);
}
/// 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)
: Style(Style), Line(Line), CurrentToken(Line.First), AutoFound(false),
Keywords(Keywords) {
Contexts.push_back(Context(tok::unknown, 1, /*IsExpression=*/false));
resetTokenMetadata(CurrentToken);
}
private:
bool parseAngle() {
if (!CurrentToken || !CurrentToken->Previous)
return false;
if (NonTemplateLess.count(CurrentToken->Previous))
return false;
const FormatToken &Previous = *CurrentToken->Previous; // The '<'.
if (Previous.Previous) {
if (Previous.Previous->Tok.isLiteral())
return false;
if (Previous.Previous->is(tok::r_paren) && Contexts.size() > 1 &&
(!Previous.Previous->MatchingParen ||
!Previous.Previous->MatchingParen->is(TT_OverloadedOperatorLParen)))
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.
Contexts.back().InTemplateArgument =
Left->Previous && Left->Previous->Tok.isNot(tok::kw_template);
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 &&
(isKeywordWithCondition(*Line.First) ||
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);
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.Language != FormatStyle::LK_Proto &&
Style.Language != FormatStyle::LK_TextProto))
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;
FormatToken *Left = CurrentToken->Previous;
assert(Left && "Unknown previous token");
FormatToken *PrevNonComment = Left->getPreviousNonComment();
Left->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 (Left->Previous && Left->Previous->is(TT_UntouchableMacroFunc)) {
Left->Finalized = true;
return parseUntouchableParens();
}
bool StartsObjCMethodExpr = false;
if (FormatToken *MaybeSel = Left->Previous) {
// @selector( starts a selector.
if (MaybeSel->isObjCAtKeyword(tok::objc_selector) && MaybeSel->Previous &&
MaybeSel->Previous->is(tok::at)) {
StartsObjCMethodExpr = true;
}
}
if (Left->is(TT_OverloadedOperatorLParen)) {
Contexts.back().IsExpression = false;
} else if (Style.Language == FormatStyle::LK_JavaScript &&
(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 (Left->Previous &&
(Left->Previous->isOneOf(tok::kw_static_assert, tok::kw_while,
tok::l_paren, tok::comma) ||
Left->Previous->isIf() ||
Left->Previous->is(TT_BinaryOperator))) {
// static_assert, if and while usually contain expressions.
Contexts.back().IsExpression = true;
} else if (Style.Language == FormatStyle::LK_JavaScript && Left->Previous &&
(Left->Previous->is(Keywords.kw_function) ||
(Left->Previous->endsSequence(tok::identifier,
Keywords.kw_function)))) {
// function(...) or function f(...)
Contexts.back().IsExpression = false;
} else if (Style.Language == FormatStyle::LK_JavaScript && Left->Previous &&
Left->Previous->is(TT_JsTypeColon)) {
// let x: (SomeType);
Contexts.back().IsExpression = false;
} else if (isLambdaParameterList(Left)) {
// This is a parameter list of a lambda expression.
Contexts.back().IsExpression = false;
} else if (Line.InPPDirective &&
(!Left->Previous || !Left->Previous->is(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 (Left->Previous && Left->Previous->is(TT_ForEachMacro)) {
// The first argument to a foreach macro is a declaration.
Contexts.back().IsForEachMacro = true;
Contexts.back().IsExpression = false;
} else if (Left->Previous && Left->Previous->MatchingParen &&
Left->Previous->MatchingParen->is(TT_ObjCBlockLParen)) {
Contexts.back().IsExpression = false;
} else if (!Line.MustBeDeclaration && !Line.InPPDirective) {
bool IsForOrCatch =
Left->Previous && Left->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 one yet.
if (PrevNonComment && Left->is(TT_Unknown)) {
if (PrevNonComment->is(tok::kw___attribute)) {
Left->setType(TT_AttributeParen);
} else if (PrevNonComment->isOneOf(TT_TypenameMacro, tok::kw_decltype,
tok::kw_typeof, tok::kw__Atomic,
tok::kw___underlying_type)) {
Left->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;
Left->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 (^ObjCBlock)(void);
bool MightBeFunctionType = !Contexts[Contexts.size() - 2].IsExpression;
bool ProbablyFunctionType =
CurrentToken->isOneOf(tok::star, tok::amp, tok::caret);
bool HasMultipleLines = false;
bool HasMultipleParametersOnALine = false;
bool MightBeObjCForRangeLoop =
Left->Previous && Left->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) &&
Prev->isOneOf(tok::star, tok::amp, tok::ampamp) &&
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 (MightBeFunctionType && ProbablyFunctionType && CurrentToken->Next &&
(CurrentToken->Next->is(tok::l_paren) ||
(CurrentToken->Next->is(tok::l_square) && Line.MustBeDeclaration)))
Left->setType(Left->Next->is(tok::caret) ? TT_ObjCBlockLParen
: TT_FunctionTypeLParen);
Left->MatchingParen = CurrentToken;
CurrentToken->MatchingParen = Left;
if (CurrentToken->Next && CurrentToken->Next->is(tok::l_brace) &&
Left->Previous && Left->Previous->is(tok::l_paren)) {
// Detect the case where macros are used to generate lambdas or
// function bodies, e.g.:
// auto my_lambda = MARCO((Type *type, int i) { .. body .. });
for (FormatToken *Tok = Left; Tok != CurrentToken; Tok = Tok->Next) {
if (Tok->is(TT_BinaryOperator) &&
Tok->isOneOf(tok::star, tok::amp, tok::ampamp))
Tok->setType(TT_PointerOrReference);
}
}
if (StartsObjCMethodExpr) {
CurrentToken->setType(TT_ObjCMethodExpr);
if (Contexts.back().FirstObjCSelectorName) {
Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
Contexts.back().LongestObjCSelectorName;
}
}
if (Left->is(TT_AttributeParen))
CurrentToken->setType(TT_AttributeParen);
if (Left->is(TT_TypeDeclarationParen))
CurrentToken->setType(TT_TypeDeclarationParen);
if (Left->Previous && Left->Previous->is(TT_JavaAnnotation))
CurrentToken->setType(TT_JavaAnnotation);
if (Left->Previous && Left->Previous->is(TT_LeadingJavaAnnotation))
CurrentToken->setType(TT_LeadingJavaAnnotation);
if (Left->Previous && Left->Previous->is(TT_AttributeSquare))
CurrentToken->setType(TT_AttributeSquare);
if (!HasMultipleLines)
Left->setPackingKind(PPK_Inconclusive);
else if (HasMultipleParametersOnALine)
Left->setPackingKind(PPK_BinPacked);
else
Left->setPackingKind(PPK_OnePerLine);
next();
return true;
}
if (CurrentToken->isOneOf(tok::r_square, tok::r_brace))
return false;
if (CurrentToken->is(tok::l_brace))
Left->setType(TT_Unknown); // Not TT_ObjCBlockLParen
if (CurrentToken->is(tok::comma) && CurrentToken->Next &&
!CurrentToken->Next->HasUnescapedNewline &&
!CurrentToken->Next->isTrailingComment())
HasMultipleParametersOnALine = true;
if ((CurrentToken->Previous->isOneOf(tok::kw_const, tok::kw_auto) ||
CurrentToken->Previous->isSimpleTypeSpecifier()) &&
!CurrentToken->is(tok::l_brace))
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(Left, 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 isCpp11AttributeSpecifier(const FormatToken &Tok) {
if (!Style.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);
}
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().InTemplateArgument);
bool IsCpp11AttributeSpecifier = isCpp11AttributeSpecifier(*Left) ||
Contexts.back().InCpp11AttributeSpecifier;
// 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);
} else if (Style.Language == FormatStyle::LK_JavaScript && 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.Language == FormatStyle::LK_Proto ||
Style.Language == FormatStyle::LK_TextProto) {
// 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.Language == FormatStyle::LK_JavaScript && 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 (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->setType(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_LambdaArrow))
CurrentToken->Next->setType(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 (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 parseBrace() {
if (CurrentToken) {
FormatToken *Left = CurrentToken->Previous;
Left->ParentBracket = Contexts.back().ContextKind;
if (Contexts.back().CaretFound)
Left->setType(TT_ObjCBlockLBrace);
Contexts.back().CaretFound = false;
ScopedContextCreator ContextCreator(*this, tok::l_brace, 1);
Contexts.back().ColonIsDictLiteral = true;
if (Left->is(BK_BracedInit))
Contexts.back().IsExpression = true;
if (Style.Language == FormatStyle::LK_JavaScript && Left->Previous &&
Left->Previous->is(TT_JsTypeColon))
Contexts.back().IsExpression = false;
while (CurrentToken) {
if (CurrentToken->is(tok::r_brace)) {
Left->MatchingParen = CurrentToken;
CurrentToken->MatchingParen = Left;
next();
return true;
}
if (CurrentToken->isOneOf(tok::r_paren, tok::r_square))
return false;
updateParameterCount(Left, 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.Language == FormatStyle::LK_Proto ||
Style.Language == FormatStyle::LK_TextProto) {
Left->setType(TT_DictLiteral);
if (Previous->Tok.getIdentifierInfo() ||
Previous->is(tok::string_literal))
Previous->setType(TT_SelectorName);
}
if (CurrentToken->is(tok::colon) ||
Style.Language == FormatStyle::LK_JavaScript)
Left->setType(TT_DictLiteral);
}
if (CurrentToken->is(tok::comma) &&
Style.Language == FormatStyle::LK_JavaScript)
Left->setType(TT_DictLiteral);
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() {
FormatToken *Tok = CurrentToken;
next();
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;
// Colons from ?: are handled in parseConditional().
if (Style.Language == FormatStyle::LK_JavaScript) {
if (Contexts.back().ColonIsForRangeExpr || // colon in for loop
(Contexts.size() == 1 && // switch/case labels
!Line.First->isOneOf(tok::kw_enum, tok::kw_case)) ||
Contexts.back().ContextKind == tok::l_paren || // function params
Contexts.back().ContextKind == tok::l_square || // array type
(!Contexts.back().IsExpression &&
Contexts.back().ContextKind == tok::l_brace) || // object type
(Contexts.size() == 1 &&
Line.MustBeDeclaration)) { // method/property declaration
Contexts.back().IsExpression = false;
Tok->setType(TT_JsTypeColon);
break;
}
} else if (Style.isCSharp()) {
if (Contexts.back().InCSharpAttributeSpecifier) {
Tok->setType(TT_AttributeColon);
break;
}
if (Contexts.back().ContextKind == tok::l_paren) {
Tok->setType(TT_CSharpNamedArgumentColon);
break;
}
}
if (Contexts.back().ColonIsDictLiteral ||
Style.Language == FormatStyle::LK_Proto ||
Style.Language == FormatStyle::LK_TextProto) {
Tok->setType(TT_DictLiteral);
if (Style.Language == FormatStyle::LK_TextProto) {
if (FormatToken *Previous = Tok->getPreviousNonComment())
Previous->setType(TT_SelectorName);
}
} else if (Contexts.back().ColonIsObjCMethodExpr ||
Line.startsWith(TT_ObjCMethodSpecifier)) {
Tok->setType(TT_ObjCMethodExpr);
const FormatToken *BeforePrevious = Tok->Previous->Previous;
// Ensure we tag all identifiers in method declarations as
// TT_SelectorName.
bool UnknownIdentifierInMethodDeclaration =
Line.startsWith(TT_ObjCMethodSpecifier) &&
Tok->Previous->is(tok::identifier) && Tok->Previous->is(TT_Unknown);
if (!BeforePrevious ||
// FIXME(bug 36976): ObjC return types shouldn't use TT_CastRParen.
!(BeforePrevious->is(TT_CastRParen) ||
(BeforePrevious->is(TT_ObjCMethodExpr) &&
BeforePrevious->is(tok::colon))) ||
BeforePrevious->is(tok::r_square) ||
Contexts.back().LongestObjCSelectorName == 0 ||
UnknownIdentifierInMethodDeclaration) {
Tok->Previous->setType(TT_SelectorName);
if (!Contexts.back().FirstObjCSelectorName)
Contexts.back().FirstObjCSelectorName = Tok->Previous;
else if (Tok->Previous->ColumnWidth >
Contexts.back().LongestObjCSelectorName)
Contexts.back().LongestObjCSelectorName =
Tok->Previous->ColumnWidth;
Tok->Previous->ParameterIndex =
Contexts.back().FirstObjCSelectorName->ObjCSelectorNameParts;
++Contexts.back().FirstObjCSelectorName->ObjCSelectorNameParts;
}
} else if (Contexts.back().ColonIsForRangeExpr) {
Tok->setType(TT_RangeBasedForLoopColon);
} else if (CurrentToken && CurrentToken->is(tok::numeric_constant)) {
Tok->setType(TT_BitFieldColon);
} else if (Contexts.size() == 1 &&
!Line.First->isOneOf(tok::kw_enum, tok::kw_case,
tok::kw_default)) {
FormatToken *Prev = Tok->getPreviousNonComment();
if (Prev->isOneOf(tok::r_paren, tok::kw_noexcept))
Tok->setType(TT_CtorInitializerColon);
else if (Prev->is(tok::kw_try)) {
// Member initializer list within function try block.
FormatToken *PrevPrev = Prev->getPreviousNonComment();
if (PrevPrev && PrevPrev->isOneOf(tok::r_paren, tok::kw_noexcept))
Tok->setType(TT_CtorInitializerColon);
} else
Tok->setType(TT_InheritanceColon);
} else if (canBeObjCSelectorComponent(*Tok->Previous) && Tok->Next &&
(Tok->Next->isOneOf(tok::r_paren, tok::comma) ||
(canBeObjCSelectorComponent(*Tok->Next) && Tok->Next->Next &&
Tok->Next->Next->is(tok::colon)))) {
// This handles a special macro in ObjC code where selectors including
// the colon are passed as macro arguments.
Tok->setType(TT_ObjCMethodExpr);
} else if (Contexts.back().ContextKind == tok::l_paren) {
Tok->setType(TT_InlineASMColon);
}
break;
case tok::pipe:
case tok::amp:
// | and & in declarations/type expressions represent union and
// intersection types, respectively.
if (Style.Language == FormatStyle::LK_JavaScript &&
!Contexts.back().IsExpression)
Tok->setType(TT_JsTypeOperator);
break;
case tok::kw_if:
case tok::kw_while:
if (Tok->is(tok::kw_if) && CurrentToken &&
CurrentToken->isOneOf(tok::kw_constexpr, tok::identifier))
next();
if (CurrentToken && CurrentToken->is(tok::l_paren)) {
next();
if (!parseParens(/*LookForDecls=*/true))
return false;
}
break;
case tok::kw_for:
if (Style.Language == FormatStyle::LK_JavaScript) {
// x.for and {for: ...}
if ((Tok->Previous && Tok->Previous->is(tok::period)) ||
(Tok->Next && Tok->Next->is(tok::colon)))
break;
// JS' for await ( ...
if (CurrentToken && CurrentToken->is(Keywords.kw_await))
next();
}
Contexts.back().ColonIsForRangeExpr = true;
next();
if (!parseParens())
return false;
break;
case tok::l_paren:
// When faced with 'operator()()', the kw_operator handler incorrectly
// marks the first l_paren as a OverloadedOperatorLParen. Here, we make
// the first two parens OverloadedOperators and the second l_paren an
// OverloadedOperatorLParen.
if (Tok->Previous && Tok->Previous->is(tok::r_paren) &&
Tok->Previous->MatchingParen &&
Tok->Previous->MatchingParen->is(TT_OverloadedOperatorLParen)) {
Tok->Previous->setType(TT_OverloadedOperator);
Tok->Previous->MatchingParen->setType(TT_OverloadedOperator);
Tok->setType(TT_OverloadedOperatorLParen);
}
if (!parseParens())
return false;
if (Line.MustBeDeclaration && Contexts.size() == 1 &&
!Contexts.back().IsExpression && !Line.startsWith(TT_ObjCProperty) &&
!Tok->is(TT_TypeDeclarationParen) &&
(!Tok->Previous || !Tok->Previous->isOneOf(tok::kw___attribute,
TT_LeadingJavaAnnotation)))
Line.MightBeFunctionDecl = true;
break;
case tok::l_square:
if (!parseSquare())
return false;
break;
case tok::l_brace:
if (Style.Language == FormatStyle::LK_TextProto) {
FormatToken *Previous = Tok->getPreviousNonComment();
if (Previous && Previous->getType() != TT_DictLiteral)
Previous->setType(TT_SelectorName);
}
if (!parseBrace())
return false;
break;
case tok::less:
if (parseAngle()) {
Tok->setType(TT_TemplateOpener);
// 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 && Tok->Previous &&
Tok->Previous->isOneOf(TT_SelectorName, TT_DictLiteral))) {
Tok->setType(TT_DictLiteral);
FormatToken *Previous = Tok->getPreviousNonComment();
if (Previous && Previous->getType() != TT_DictLiteral)
Previous->setType(TT_SelectorName);
}
} else {
Tok->setType(TT_BinaryOperator);
NonTemplateLess.insert(Tok);
CurrentToken = Tok;
next();
}
break;
case tok::r_paren:
case tok::r_square:
return false;
case tok::r_brace:
// Lines can start with '}'.
if (Tok->Previous)
return false;
break;
case tok::greater:
if (Style.Language != FormatStyle::LK_TextProto)
Tok->setType(TT_BinaryOperator);
if (Tok->Previous && Tok->Previous->is(TT_TemplateCloser))
Tok->SpacesRequiredBefore = 1;
break;
case tok::kw_operator:
if (Style.Language == FormatStyle::LK_TextProto ||
Style.Language == FormatStyle::LK_Proto)
break;
while (CurrentToken &&
!CurrentToken->isOneOf(tok::l_paren, tok::semi, tok::r_paren)) {
if (CurrentToken->isOneOf(tok::star, tok::amp))
CurrentToken->setType(TT_PointerOrReference);
consumeToken();
if (CurrentToken && CurrentToken->is(tok::comma) &&
CurrentToken->Previous->isNot(tok::kw_operator))
break;
if (CurrentToken && CurrentToken->Previous->isOneOf(
TT_BinaryOperator, TT_UnaryOperator, tok::comma,
tok::star, tok::arrow, tok::amp, tok::ampamp))
CurrentToken->Previous->setType(TT_OverloadedOperator);
}
if (CurrentToken && CurrentToken->is(tok::l_paren))
CurrentToken->setType(TT_OverloadedOperatorLParen);
if (CurrentToken && CurrentToken->Previous->is(TT_BinaryOperator))
CurrentToken->Previous->setType(TT_OverloadedOperator);
break;
case tok::question:
if (Style.Language == FormatStyle::LK_JavaScript && Tok->Next &&
Tok->Next->isOneOf(tok::semi, tok::comma, tok::colon, tok::r_paren,
tok::r_brace)) {
// Question marks before semicolons, colons, etc. indicate optional
// types (fields, parameters), e.g.
// function(x?: string, y?) {...}
// class X { y?; }
Tok->setType(TT_JsTypeOptionalQuestion);
break;
}
// Declarations cannot be conditional expressions, this can only be part
// of a type declaration.
if (Line.MustBeDeclaration && !Contexts.back().IsExpression &&
Style.Language == FormatStyle::LK_JavaScript)
break;
if (Style.isCSharp()) {
// `Type?)`, `Type?>`, `Type? name;` and `Type? name =` can only be
// nullable types.
// Line.MustBeDeclaration will be true for `Type? name;`.
if ((!Contexts.back().IsExpression && Line.MustBeDeclaration) ||
(Tok->Next && Tok->Next->isOneOf(tok::r_paren, tok::greater)) ||
(Tok->Next && Tok->Next->is(tok::identifier) && Tok->Next->Next &&
Tok->Next->Next->is(tok::equal))) {
Tok->setType(TT_CSharpNullable);
break;
}
}
parseConditional();
break;
case tok::kw_template:
parseTemplateDeclaration();
break;
case tok::comma:
if (Contexts.back().InCtorInitializer)
Tok->setType(TT_CtorInitializerComma);
else if (Contexts.back().InInheritanceList)
Tok->setType(TT_InheritanceComma);
else if (Contexts.back().FirstStartOfName &&
(Contexts.size() == 1 || Line.startsWith(tok::kw_for))) {
Contexts.back().FirstStartOfName->PartOfMultiVariableDeclStmt = true;
Line.IsMultiVariableDeclStmt = true;
}
if (Contexts.back().IsForEachMacro)
Contexts.back().IsExpression = true;
break;
case tok::identifier:
if (Tok->isOneOf(Keywords.kw___has_include,
Keywords.kw___has_include_next)) {
parseHasInclude();
}
if (Style.isCSharp() && Tok->is(Keywords.kw_where) && Tok->Next &&
Tok->Next->isNot(tok::l_paren)) {
Tok->setType(TT_CSharpGenericTypeConstraint);
parseCSharpGenericTypeConstraint();
}
break;
default:
break;
}
return true;
}
void parseCSharpGenericTypeConstraint() {
int OpenAngleBracketsCount = 0;
while (CurrentToken) {
if (CurrentToken->is(tok::less)) {
// parseAngle is too greedy and will consume the whole line.
CurrentToken->setType(TT_TemplateOpener);
++OpenAngleBracketsCount;
next();
} else if (CurrentToken->is(tok::greater)) {
CurrentToken->setType(TT_TemplateCloser);
--OpenAngleBracketsCount;
next();
} else if (CurrentToken->is(tok::comma) && OpenAngleBracketsCount == 0) {
// We allow line breaks after GenericTypeConstraintComma's
// so do not flag commas in Generics as GenericTypeConstraintComma's.
CurrentToken->setType(TT_CSharpGenericTypeConstraintComma);
next();
} else if (CurrentToken->is(Keywords.kw_where)) {
CurrentToken->setType(TT_CSharpGenericTypeConstraint);
next();
} else if (CurrentToken->is(tok::colon)) {
CurrentToken->setType(TT_CSharpGenericTypeConstraintColon);
next();
} else {
next();
}
}
}
void parseIncludeDirective() {
if (CurrentToken && CurrentToken->is(tok::less)) {
next();
while (CurrentToken) {
// Mark tokens up to the trailing line comments as implicit string
// literals.
if (CurrentToken->isNot(tok::comment) &&
!CurrentToken->TokenText.startswith("//"))
CurrentToken->setType(TT_ImplicitStringLiteral);
next();
}
}
}
void parseWarningOrError() {
next();
// We still want to format the whitespace left of the first token of the
// warning or error.
next();
while (CurrentToken) {
CurrentToken->setType(TT_ImplicitStringLiteral);
next();
}
}
void parsePragma() {
next(); // Consume "pragma".
if (CurrentToken &&
CurrentToken->isOneOf(Keywords.kw_mark, Keywords.kw_option)) {
bool IsMark = CurrentToken->is(Keywords.kw_mark);
next(); // Consume "mark".
next(); // Consume first token (so we fix leading whitespace).
while (CurrentToken) {
if (IsMark || CurrentToken->Previous->is(TT_BinaryOperator))
CurrentToken->setType(TT_ImplicitStringLiteral);
next();
}
}
}
void parseHasInclude() {
if (!CurrentToken || !CurrentToken->is(tok::l_paren))
return;
next(); // '('
parseIncludeDirective();
next(); // ')'
}
LineType parsePreprocessorDirective() {
bool IsFirstToken = CurrentToken->IsFirst;
LineType Type = LT_PreprocessorDirective;
next();
if (!CurrentToken)
return Type;
if (Style.Language == FormatStyle::LK_JavaScript && IsFirstToken) {
// JavaScript files can contain shebang lines of the form:
// #!/usr/bin/env node
// Treat these like C++ #include directives.
while (CurrentToken) {
// Tokens cannot be comments here.
CurrentToken->setType(TT_ImplicitStringLiteral);
next();
}
return LT_ImportStatement;
}
if (CurrentToken->Tok.is(tok::numeric_constant)) {
CurrentToken->SpacesRequiredBefore = 1;
return Type;
}
// Hashes in the middle of a line can lead to any strange token
// sequence.
if (!CurrentToken->Tok.getIdentifierInfo())
return Type;
switch (CurrentToken->Tok.getIdentifierInfo()->getPPKeywordID()) {
case tok::pp_include:
case tok::pp_include_next:
case tok::pp_import:
next();
parseIncludeDirective();
Type = LT_ImportStatement;
break;
case tok::pp_error:
case tok::pp_warning:
parseWarningOrError();
break;
case tok::pp_pragma:
parsePragma();
break;
case tok::pp_if:
case tok::pp_elif:
Contexts.back().IsExpression = true;
next();
parseLine();
break;
default:
break;
}
while (CurrentToken) {
FormatToken *Tok = CurrentToken;
next();
if (Tok->is(tok::l_paren))
parseParens();
else if (Tok->isOneOf(Keywords.kw___has_include,
Keywords.kw___has_include_next))
parseHasInclude();
}
return Type;
}
public:
LineType parseLine() {
if (!CurrentToken)
return LT_Invalid;
NonTemplateLess.clear();
if (CurrentToken->is(tok::hash))
return parsePreprocessorDirective();
// Directly allow to 'import <string-literal>' to support protocol buffer
// definitions (github.com/google/protobuf) or missing "#" (either way we
// should not break the line).
IdentifierInfo *Info = CurrentToken->Tok.getIdentifierInfo();
if ((Style.Language == FormatStyle::LK_Java &&
CurrentToken->is(Keywords.kw_package)) ||
(Info && Info->getPPKeywordID() == tok::pp_import &&
CurrentToken->Next &&
CurrentToken->Next->isOneOf(tok::string_literal, tok::identifier,
tok::kw_static))) {
next();
parseIncludeDirective();
return LT_ImportStatement;
}
// If this line starts and ends in '<' and '>', respectively, it is likely
// part of "#define <a/b.h>".
if (CurrentToken->is(tok::less) && Line.Last->is(tok::greater)) {
parseIncludeDirective();
return LT_ImportStatement;
}
// In .proto files, top-level options and package statements are very
// similar to import statements and should not be line-wrapped.
if (Style.Language == FormatStyle::LK_Proto && Line.Level == 0 &&
CurrentToken->isOneOf(Keywords.kw_option, Keywords.kw_package)) {
next();
if (CurrentToken && CurrentToken->is(tok::identifier)) {
while (CurrentToken)
next();
return LT_ImportStatement;
}
}
bool KeywordVirtualFound = false;
bool ImportStatement = false;
// import {...} from '...';
if (Style.Language == FormatStyle::LK_JavaScript &&
CurrentToken->is(Keywords.kw_import))
ImportStatement = true;
while (CurrentToken) {
if (CurrentToken->is(tok::kw_virtual))
KeywordVirtualFound = true;
if (Style.Language == FormatStyle::LK_JavaScript) {
// export {...} from '...';
// An export followed by "from 'some string';" is a re-export from
// another module identified by a URI and is treated as a
// LT_ImportStatement (i.e. prevent wraps on it for long URIs).
// Just "export {...};" or "export class ..." should not be treated as
// an import in this sense.
if (Line.First->is(tok::kw_export) &&
CurrentToken->is(Keywords.kw_from) && CurrentToken->Next &&
CurrentToken->Next->isStringLiteral())
ImportStatement = true;
if (isClosureImportStatement(*CurrentToken))
ImportStatement = true;
}
if (!consumeToken())
return LT_Invalid;
}
if (KeywordVirtualFound)
return LT_VirtualFunctionDecl;
if (ImportStatement)
return LT_ImportStatement;
if (Line.startsWith(TT_ObjCMethodSpecifier)) {
if (Contexts.back().FirstObjCSelectorName)
Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
Contexts.back().LongestObjCSelectorName;
return LT_ObjCMethodDecl;
}
return LT_Other;
}
private:
bool isClosureImportStatement(const FormatToken &Tok) {
// FIXME: Closure-library specific stuff should not be hard-coded but be
// configurable.
return Tok.TokenText == "goog" && Tok.Next && Tok.Next->is(tok::period) &&
Tok.Next->Next &&
(Tok.Next->Next->TokenText == "module" ||
Tok.Next->Next->TokenText == "provide" ||
Tok.Next->Next->TokenText == "require" ||
Tok.Next->Next->TokenText == "requireType" ||
Tok.Next->Next->TokenText == "forwardDeclare") &&
Tok.Next->Next->Next && Tok.Next->Next->Next->is(tok::l_paren);
}
void resetTokenMetadata(FormatToken *Token) {
if (!Token)
return;
// Reset token type in case we have already looked at it and then
// recovered from an error (e.g. failure to find the matching >).
if (!CurrentToken->isOneOf(
TT_LambdaLSquare, TT_LambdaLBrace, TT_AttributeMacro,
TT_ForEachMacro, TT_TypenameMacro, TT_FunctionLBrace,
TT_ImplicitStringLiteral, TT_InlineASMBrace, TT_FatArrow,
TT_LambdaArrow, TT_NamespaceMacro, TT_OverloadedOperator,
TT_RegexLiteral, TT_TemplateString, TT_ObjCStringLiteral,
TT_UntouchableMacroFunc, TT_ConstraintJunctions,
TT_StatementAttributeLikeMacro))
CurrentToken->setType(TT_Unknown);
CurrentToken->Role.reset();
CurrentToken->MatchingParen = nullptr;
CurrentToken->FakeLParens.clear();
CurrentToken->FakeRParens = 0;
}
void next() {
if (CurrentToken) {
CurrentToken->NestingLevel = Contexts.size() - 1;
CurrentToken->BindingStrength = Contexts.back().BindingStrength;
modifyContext(*CurrentToken);
determineTokenType(*CurrentToken);
CurrentToken = CurrentToken->Next;
}
resetTokenMetadata(CurrentToken);
}
/// A struct to hold information valid in a specific context, e.g.
/// a pair of parenthesis.
struct Context {
Context(tok::TokenKind ContextKind, unsigned BindingStrength,
bool IsExpression)
: ContextKind(ContextKind), BindingStrength(BindingStrength),
IsExpression(IsExpression) {}
tok::TokenKind ContextKind;
unsigned BindingStrength;
bool IsExpression;
unsigned LongestObjCSelectorName = 0;
bool ColonIsForRangeExpr = false;
bool ColonIsDictLiteral = false;
bool ColonIsObjCMethodExpr = false;
FormatToken *FirstObjCSelectorName = nullptr;
FormatToken *FirstStartOfName = nullptr;
bool CanBeExpression = true;
bool InTemplateArgument = false;
bool InCtorInitializer = false;
bool InInheritanceList = false;
bool CaretFound = false;
bool IsForEachMacro = false;
bool InCpp11AttributeSpecifier = false;
bool InCSharpAttributeSpecifier = false;
};
/// Puts a new \c Context onto the stack \c Contexts for the lifetime
/// of each instance.
struct ScopedContextCreator {
AnnotatingParser &P;
ScopedContextCreator(AnnotatingParser &P, tok::TokenKind ContextKind,
unsigned Increase)
: P(P) {
P.Contexts.push_back(Context(ContextKind,
P.Contexts.back().BindingStrength + Increase,
P.Contexts.back().IsExpression));
}
~ScopedContextCreator() { P.Contexts.pop_back(); }
};
void modifyContext(const FormatToken &Current) {
if (Current.getPrecedence() == prec::Assignment &&
!Line.First->isOneOf(tok::kw_template, tok::kw_using, tok::kw_return) &&
// Type aliases use `type X = ...;` in TypeScript and can be exported
// using `export type ...`.
!(Style.Language == FormatStyle::LK_JavaScript &&
(Line.startsWith(Keywords.kw_type, tok::identifier) ||
Line.startsWith(tok::kw_export, Keywords.kw_type,
tok::identifier))) &&
(!Current.Previous || Current.Previous->isNot(tok::kw_operator))) {
Contexts.back().IsExpression = true;
if (!Line.startsWith(TT_UnaryOperator)) {
for (FormatToken *Previous = Current.Previous;
Previous && Previous->Previous &&
!Previous->Previous->isOneOf(tok::comma, tok::semi);
Previous = Previous->Previous) {
if (Previous->isOneOf(tok::r_square, tok::r_paren)) {
Previous = Previous->MatchingParen;
if (!Previous)
break;
}
if (Previous->opensScope())
break;
if (Previous->isOneOf(TT_BinaryOperator, TT_UnaryOperator) &&
Previous->isOneOf(tok::star, tok::amp, tok::ampamp) &&
Previous->Previous && Previous->Previous->isNot(tok::equal))
Previous->setType(TT_PointerOrReference);
}
}
} else if (Current.is(tok::lessless) &&
(!Current.Previous || !Current.Previous->is(tok::kw_operator))) {
Contexts.back().IsExpression = true;
} else if (Current.isOneOf(tok::kw_return, tok::kw_throw)) {
Contexts.back().IsExpression = true;
} else if (Current.is(TT_TrailingReturnArrow)) {
Contexts.back().IsExpression = false;
} else if (Current.is(TT_LambdaArrow) || Current.is(Keywords.kw_assert)) {
Contexts.back().IsExpression = Style.Language == FormatStyle::LK_Java;
} else if (Current.Previous &&
Current.Previous->is(TT_CtorInitializerColon)) {
Contexts.back().IsExpression = true;
Contexts.back().InCtorInitializer = true;
} else if (Current.Previous && Current.Previous->is(TT_InheritanceColon)) {
Contexts.back().InInheritanceList = true;
} else if (Current.isOneOf(tok::r_paren, tok::greater, tok::comma)) {
for (FormatToken *Previous = Current.Previous;
Previous && Previous->isOneOf(tok::star, tok::amp);
Previous = Previous->Previous)
Previous->setType(TT_PointerOrReference);
if (Line.MustBeDeclaration && !Contexts.front().InCtorInitializer)
Contexts.back().IsExpression = false;
} else if (Current.is(tok::kw_new)) {
Contexts.back().CanBeExpression = false;
} else if (Current.is(tok::semi) ||
(Current.is(tok::exclaim) && Current.Previous &&
!Current.Previous->is(tok::kw_operator))) {
// This should be the condition or increment in a for-loop.
// But not operator !() (can't use TT_OverloadedOperator here as its not
// been annotated yet).
Contexts.back().IsExpression = true;
}
}
static FormatToken *untilMatchingParen(FormatToken *Current) {
// Used when `MatchingParen` is not yet established.
int ParenLevel = 0;
while (Current) {
if (Current->is(tok::l_paren))
ParenLevel++;
if (Current->is(tok::r_paren))
ParenLevel--;
if (ParenLevel < 1)
break;
Current = Current->Next;
}
return Current;
}
static bool isDeductionGuide(FormatToken &Current) {
// Look for a deduction guide template<T> A(...) -> A<...>;
if (Current.Previous && Current.Previous->is(tok::r_paren) &&
Current.startsSequence(tok::arrow, tok::identifier, tok::less)) {
// Find the TemplateCloser.
FormatToken *TemplateCloser = Current.Next->Next;
int NestingLevel = 0;
while (TemplateCloser) {
// Skip over an expressions in parens A<(3 < 2)>;
if (TemplateCloser->is(tok::l_paren)) {
// No Matching Paren yet so skip to matching paren
TemplateCloser = untilMatchingParen(TemplateCloser);
}
if (TemplateCloser->is(tok::less))
NestingLevel++;
if (TemplateCloser->is(tok::greater))
NestingLevel--;
if (NestingLevel < 1)
break;
TemplateCloser = TemplateCloser->Next;
}
// Assuming we have found the end of the template ensure its followed
// with a semi-colon.
if (TemplateCloser && TemplateCloser->Next &&
TemplateCloser->Next->is(tok::semi) &&
Current.Previous->MatchingParen) {
// Determine if the identifier `A` prior to the A<..>; is the same as
// prior to the A(..)
FormatToken *LeadingIdentifier =
Current.Previous->MatchingParen->Previous;
// Differentiate a deduction guide by seeing the
// > of the template prior to the leading identifier.
if (LeadingIdentifier) {
FormatToken *PriorLeadingIdentifier = LeadingIdentifier->Previous;
// Skip back past explicit decoration
if (PriorLeadingIdentifier &&
PriorLeadingIdentifier->is(tok::kw_explicit))
PriorLeadingIdentifier = PriorLeadingIdentifier->Previous;
return (PriorLeadingIdentifier &&
PriorLeadingIdentifier->is(TT_TemplateCloser) &&
LeadingIdentifier->TokenText == Current.Next->TokenText);
}
}
}
return false;
}
void determineTokenType(FormatToken &Current) {
if (!Current.is(TT_Unknown))
// The token type is already known.
return;
if ((Style.Language == FormatStyle::LK_JavaScript || Style.isCSharp()) &&
Current.is(tok::exclaim)) {
if (Current.Previous) {
bool IsIdentifier =
Style.Language == FormatStyle::LK_JavaScript
? Keywords.IsJavaScriptIdentifier(
*Current.Previous, /* AcceptIdentifierName= */ true)
: Current.Previous->is(tok::identifier);
if (IsIdentifier ||
Current.Previous->isOneOf(
tok::kw_namespace, tok::r_paren, tok::r_square, tok::r_brace,
tok::kw_false, tok::kw_true, Keywords.kw_type, Keywords.kw_get,
Keywords.kw_set) ||
Current.Previous->Tok.isLiteral()) {
Current.setType(TT_NonNullAssertion);
return;
}
}
if (Current.Next &&
Current.Next->isOneOf(TT_BinaryOperator, Keywords.kw_as)) {
Current.setType(TT_NonNullAssertion);
return;
}
}
// Line.MightBeFunctionDecl can only be true after the parentheses of a
// function declaration have been found. In this case, 'Current' is a
// trailing token of this declaration and thus cannot be a name.
if (Current.is(Keywords.kw_instanceof)) {
Current.setType(TT_BinaryOperator);
} else if (isStartOfName(Current) &&
(!Line.MightBeFunctionDecl || Current.NestingLevel != 0)) {
Contexts.back().FirstStartOfName = &Current;
Current.setType(TT_StartOfName);
} else if (Current.is(tok::semi)) {
// Reset FirstStartOfName after finding a semicolon so that a for loop
// with multiple increment statements is not confused with a for loop
// having multiple variable declarations.
Contexts.back().FirstStartOfName = nullptr;
} else if (Current.isOneOf(tok::kw_auto, tok::kw___auto_type)) {
AutoFound = true;
} else if (Current.is(tok::arrow) &&
Style.Language == FormatStyle::LK_Java) {
Current.setType(TT_LambdaArrow);
} else if (Current.is(tok::arrow) && AutoFound && Line.MustBeDeclaration &&
Current.NestingLevel == 0 &&
!Current.Previous->is(tok::kw_operator)) {
// not auto operator->() -> xxx;
Current.setType(TT_TrailingReturnArrow);
} else if (Current.is(tok::arrow) && Current.Previous &&
Current.Previous->is(tok::r_brace)) {
// Concept implicit conversion contraint needs to be treated like
// a trailing return type ... } -> <type>.
Current.setType(TT_TrailingReturnArrow);
} else if (isDeductionGuide(Current)) {
// Deduction guides trailing arrow " A(...) -> A<T>;".
Current.setType(TT_TrailingReturnArrow);
} else if (Current.isOneOf(tok::star, tok::amp, tok::ampamp)) {
Current.setType(determineStarAmpUsage(
Current,
Contexts.back().CanBeExpression && Contexts.back().IsExpression,
Contexts.back().InTemplateArgument));
} else if (Current.isOneOf(tok::minus, tok::plus, tok::caret)) {
Current.setType(determinePlusMinusCaretUsage(Current));
if (Current.is(TT_UnaryOperator) && Current.is(tok::caret))
Contexts.back().CaretFound = true;
} else if (Current.isOneOf(tok::minusminus, tok::plusplus)) {
Current.setType(determineIncrementUsage(Current));
} else if (Current.isOneOf(tok::exclaim, tok::tilde)) {
Current.setType(TT_UnaryOperator);
} else if (Current.is(tok::question)) {
if (Style.Language == FormatStyle::LK_JavaScript &&
Line.MustBeDeclaration && !Contexts.back().IsExpression) {
// In JavaScript, `interface X { foo?(): bar; }` is an optional method
// on the interface, not a ternary expression.
Current.setType(TT_JsTypeOptionalQuestion);
} else {
Current.setType(TT_ConditionalExpr);
}
} else if (Current.isBinaryOperator() &&
(!Current.Previous || Current.Previous->isNot(tok::l_square)) &&
(!Current.is(tok::greater) &&
Style.Language != FormatStyle::LK_TextProto)) {
Current.setType(TT_BinaryOperator);
} else if (Current.is(tok::comment)) {
if (Current.TokenText.startswith("/*")) {
if (Current.TokenText.endswith("*/"))
Current.setType(TT_BlockComment);
else
// The lexer has for some reason determined a comment here. But we
// cannot really handle it, if it isn't properly terminated.
Current.Tok.setKind(tok::unknown);
} else {
Current.setType(TT_LineComment);
}
} else if (Current.is(tok::r_paren)) {
if (rParenEndsCast(Current))
Current.setType(TT_CastRParen);
if (Current.MatchingParen && Current.Next &&
!Current.Next->isBinaryOperator() &&
!Current.Next->isOneOf(tok::semi, tok::colon, tok::l_brace,
tok::comma, tok::period, tok::arrow,
tok::coloncolon))
if (FormatToken *AfterParen = Current.MatchingParen->Next) {
// Make sure this isn't the return type of an Obj-C block declaration
if (AfterParen->Tok.isNot(tok::caret)) {
if (FormatToken *BeforeParen = Current.MatchingParen->Previous)
if (BeforeParen->is(tok::identifier) &&
!BeforeParen->is(TT_TypenameMacro) &&
BeforeParen->TokenText == BeforeParen->TokenText.upper() &&
(!BeforeParen->Previous ||
BeforeParen->Previous->ClosesTemplateDeclaration))
Current.setType(TT_FunctionAnnotationRParen);
}
}
} else if (Current.is(tok::at) && Current.Next &&
Style.Language != FormatStyle::LK_JavaScript &&
Style.Language != FormatStyle::LK_Java) {
// In Java & JavaScript, "@..." is a decorator or annotation. In ObjC, it
// marks declarations and properties that need special formatting.
switch (Current.Next->Tok.getObjCKeywordID()) {
case tok::objc_interface:
case tok::objc_implementation:
case tok::objc_protocol:
Current.setType(TT_ObjCDecl);
break;
case tok::objc_property:
Current.setType(TT_ObjCProperty);
break;
default:
break;
}
} else if (Current.is(tok::period)) {
FormatToken *PreviousNoComment = Current.getPreviousNonComment();
if (PreviousNoComment &&
PreviousNoComment->isOneOf(tok::comma, tok::l_brace))
Current.setType(TT_DesignatedInitializerPeriod);
else if (Style.Language == FormatStyle::LK_Java && Current.Previous &&
Current.Previous->isOneOf(TT_JavaAnnotation,
TT_LeadingJavaAnnotation)) {
Current.setType(Current.Previous->getType());
}
} else if (canBeObjCSelectorComponent(Current) &&
// FIXME(bug 36976): ObjC return types shouldn't use
// TT_CastRParen.
Current.Previous && Current.Previous->is(TT_CastRParen) &&
Current.Previous->MatchingParen &&
Current.Previous->MatchingParen->Previous &&
Current.Previous->MatchingParen->Previous->is(
TT_ObjCMethodSpecifier)) {
// This is the first part of an Objective-C selector name. (If there's no
// colon after this, this is the only place which annotates the identifier
// as a selector.)
Current.setType(TT_SelectorName);
} else if (Current.isOneOf(tok::identifier, tok::kw_const, tok::kw_noexcept,
tok::kw_requires) &&
Current.Previous &&
!Current.Previous->isOneOf(tok::equal, tok::at) &&
Line.MightBeFunctionDecl && Contexts.size() == 1) {
// Line.MightBeFunctionDecl can only be true after the parentheses of a
// function declaration have been found.
Current.setType(TT_TrailingAnnotation);
} else if ((Style.Language == FormatStyle::LK_Java ||
Style.Language == FormatStyle::LK_JavaScript) &&
Current.Previous) {
if (Current.Previous->is(tok::at) &&
Current.isNot(Keywords.kw_interface)) {
const FormatToken &AtToken = *Current.Previous;
const FormatToken *Previous = AtToken.getPreviousNonComment();
if (!Previous || Previous->is(TT_LeadingJavaAnnotation))
Current.setType(TT_LeadingJavaAnnotation);
else
Current.setType(TT_JavaAnnotation);
} else if (Current.Previous->is(tok::period) &&
Current.Previous->isOneOf(TT_JavaAnnotation,
TT_LeadingJavaAnnotation)) {
Current.setType(Current.Previous->getType());
}
}
}
/// Take a guess at whether \p Tok starts a name of a function or
/// variable declaration.
///
/// This is a heuristic based on whether \p Tok is an identifier following
/// something that is likely a type.
bool isStartOfName(const FormatToken &Tok) {
if (Tok.isNot(tok::identifier) || !Tok.Previous)
return false;
if (Tok.Previous->isOneOf(TT_LeadingJavaAnnotation, Keywords.kw_instanceof,
Keywords.kw_as))
return false;
if (Style.Language == FormatStyle::LK_JavaScript &&
Tok.Previous->is(Keywords.kw_in))
return false;
// Skip "const" as it does not have an influence on whether this is a name.
FormatToken *PreviousNotConst = Tok.getPreviousNonComment();
while (PreviousNotConst && PreviousNotConst->is(tok::kw_const))
PreviousNotConst = PreviousNotConst->getPreviousNonComment();
if (!PreviousNotConst)
return false;
bool IsPPKeyword = PreviousNotConst->is(tok::identifier) &&
PreviousNotConst->Previous &&
PreviousNotConst->Previous->is(tok::hash);
if (PreviousNotConst->is(TT_TemplateCloser))
return PreviousNotConst && PreviousNotConst->MatchingParen &&
PreviousNotConst->MatchingParen->Previous &&
PreviousNotConst->MatchingParen->Previous->isNot(tok::period) &&
PreviousNotConst->MatchingParen->Previous->isNot(tok::kw_template);
if (PreviousNotConst->is(tok::r_paren) &&
PreviousNotConst->is(TT_TypeDeclarationParen))
return true;
return (!IsPPKeyword &&
PreviousNotConst->isOneOf(tok::identifier, tok::kw_auto)) ||
PreviousNotConst->is(TT_PointerOrReference) ||
PreviousNotConst->isSimpleTypeSpecifier();
}
/// Determine whether ')' is ending a cast.
bool rParenEndsCast(const FormatToken &Tok) {
// C-style casts are only used in C++, C# and Java.
if (!Style.isCSharp() && !Style.isCpp() &&
Style.Language != FormatStyle::LK_Java)
return false;
// Empty parens aren't casts and there are no casts at the end of the line.
if (Tok.Previous == Tok.MatchingParen || !Tok.Next || !Tok.MatchingParen)
return false;
FormatToken *LeftOfParens = Tok.MatchingParen->getPreviousNonComment();
if (LeftOfParens) {
// If there is a closing parenthesis left of the current parentheses,
// look past it as these might be chained casts.
if (LeftOfParens->is(tok::r_paren)) {
if (!LeftOfParens->MatchingParen ||
!LeftOfParens->MatchingParen->Previous)
return false;
LeftOfParens = LeftOfParens->MatchingParen->Previous;
}
// If there is an identifier (or with a few exceptions a keyword) right
// before the parentheses, this is unlikely to be a cast.
if (LeftOfParens->Tok.getIdentifierInfo() &&
!LeftOfParens->isOneOf(Keywords.kw_in, tok::kw_return, tok::kw_case,
tok::kw_delete))
return false;
// Certain other tokens right before the parentheses are also signals that
// this cannot be a cast.
if (LeftOfParens->isOneOf(tok::at, tok::r_square, TT_OverloadedOperator,
TT_TemplateCloser, tok::ellipsis))
return false;
}
if (Tok.Next->is(tok::question))
return false;
// `foreach((A a, B b) in someList)` should not be seen as a cast.
if (Tok.Next->is(Keywords.kw_in) && Style.isCSharp())
return false;
// Functions which end with decorations like volatile, noexcept are unlikely
// to be casts.
if (Tok.Next->isOneOf(tok::kw_noexcept, tok::kw_volatile, tok::kw_const,
tok::kw_requires, tok::kw_throw, tok::arrow,
Keywords.kw_override, Keywords.kw_final) ||
isCpp11AttributeSpecifier(*Tok.Next))
return false;
// As Java has no function types, a "(" after the ")" likely means that this
// is a cast.
if (Style.Language == FormatStyle::LK_Java && Tok.Next->is(tok::l_paren))
return true;
// If a (non-string) literal follows, this is likely a cast.
if (Tok.Next->isNot(tok::string_literal) &&
(Tok.Next->Tok.isLiteral() ||
Tok.Next->isOneOf(tok::kw_sizeof, tok::kw_alignof)))
return true;
// Heuristically try to determine whether the parentheses contain a type.
auto IsQualifiedPointerOrReference = [](FormatToken *T) {
// This is used to handle cases such as x = (foo *const)&y;
assert(!T->isSimpleTypeSpecifier() && "Should have already been checked");
// Strip trailing qualifiers such as const or volatile when checking
// whether the parens could be a cast to a pointer/reference type.
while (T) {
if (T->is(TT_AttributeParen)) {
// Handle `x = (foo *__attribute__((foo)))&v;`:
if (T->MatchingParen && T->MatchingParen->Previous &&
T->MatchingParen->Previous->is(tok::kw___attribute)) {
T = T->MatchingParen->Previous->Previous;
continue;
}
} else if (T->is(TT_AttributeSquare)) {
// Handle `x = (foo *[[clang::foo]])&v;`:
if (T->MatchingParen && T->MatchingParen->Previous) {
T = T->MatchingParen->Previous;
continue;
}
} else if (T->canBePointerOrReferenceQualifier()) {
T = T->Previous;
continue;
}
break;
}
return T && T->is(TT_PointerOrReference);
};
bool ParensAreType =
!Tok.Previous ||
Tok.Previous->isOneOf(TT_TemplateCloser, TT_TypeDeclarationParen) ||
Tok.Previous->isSimpleTypeSpecifier() ||
IsQualifiedPointerOrReference(Tok.Previous);
bool ParensCouldEndDecl =
Tok.Next->isOneOf(tok::equal, tok::semi, tok::l_brace, tok::greater);
if (ParensAreType && !ParensCouldEndDecl)
return true;
// At this point, we heuristically assume that there are no casts at the
// start of the line. We assume that we have found most cases where there
// are by the logic above, e.g. "(void)x;".
if (!LeftOfParens)
return false;
// Certain token types inside the parentheses mean that this can't be a
// cast.
for (const FormatToken *Token = Tok.MatchingParen->Next; Token != &Tok;
Token = Token->Next)
if (Token->is(TT_BinaryOperator))
return false;
// If the following token is an identifier or 'this', this is a cast. All
// cases where this can be something else are handled above.
if (Tok.Next->isOneOf(tok::identifier, tok::kw_this))
return true;
if (Tok.Next->is(tok::l_paren) &&
!(Tok.Previous && Tok.Previous->is(tok::identifier) &&
Tok.Previous->Previous &&
Tok.Previous->Previous->isOneOf(tok::arrowstar, tok::arrow,
tok::star)))
return true;
if (!Tok.Next->Next)
return false;
// If the next token after the parenthesis is a unary operator, assume
// that this is cast, unless there are unexpected tokens inside the
// parenthesis.
bool NextIsUnary =
Tok.Next->isUnaryOperator() || Tok.Next->isOneOf(tok::amp, tok::star);
if (!NextIsUnary || Tok.Next->is(tok::plus) ||
!Tok.Next->Next->isOneOf(tok::identifier, tok::numeric_constant))
return false;
// Search for unexpected tokens.
for (FormatToken *Prev = Tok.Previous; Prev != Tok.MatchingParen;
Prev = Prev->Previous) {
if (!Prev->isOneOf(tok::kw_const, tok::identifier, tok::coloncolon))
return false;
}
return true;
}
/// Return the type of the given token assuming it is * or &.
TokenType determineStarAmpUsage(const FormatToken &Tok, bool IsExpression,
bool InTemplateArgument) {
if (Style.Language == FormatStyle::LK_JavaScript)
return TT_BinaryOperator;
// && in C# must be a binary operator.
if (Style.isCSharp() && Tok.is(tok::ampamp))
return TT_BinaryOperator;
const FormatToken *PrevToken = Tok.getPreviousNonComment();
if (!PrevToken)
return TT_UnaryOperator;
const FormatToken *NextToken = Tok.getNextNonComment();
if (!NextToken ||
NextToken->isOneOf(tok::arrow, tok::equal, tok::kw_noexcept) ||
NextToken->canBePointerOrReferenceQualifier() ||
(NextToken->is(tok::l_brace) && !NextToken->getNextNonComment()))
return TT_PointerOrReference;
if (PrevToken->is(tok::coloncolon))
return TT_PointerOrReference;
if (PrevToken->is(tok::r_paren) && PrevToken->is(TT_TypeDeclarationParen))
return TT_PointerOrReference;
if (PrevToken->isOneOf(tok::l_paren, tok::l_square, tok::l_brace,
tok::comma, tok::semi, tok::kw_return, tok::colon,
tok::kw_co_return, tok::kw_co_await,
tok::kw_co_yield, tok::equal, tok::kw_delete,
tok::kw_sizeof, tok::kw_throw) ||
PrevToken->isOneOf(TT_BinaryOperator, TT_ConditionalExpr,
TT_UnaryOperator, TT_CastRParen))
return TT_UnaryOperator;
if (NextToken->is(tok::l_square) && NextToken->isNot(TT_LambdaLSquare))
return TT_PointerOrReference;
if (NextToken->is(tok::kw_operator) && !IsExpression)
return TT_PointerOrReference;
if (NextToken->isOneOf(tok::comma, tok::semi))
return TT_PointerOrReference;
if (PrevToken->Tok.isLiteral() ||
PrevToken->isOneOf(tok::r_paren, tok::r_square, tok::kw_true,
tok::kw_false, tok::r_brace) ||
NextToken->Tok.isLiteral() ||
NextToken->isOneOf(tok::kw_true, tok::kw_false) ||
NextToken->isUnaryOperator() ||
// If we know we're in a template argument, there are no named
// declarations. Thus, having an identifier on the right-hand side
// indicates a binary operator.
(InTemplateArgument && NextToken->Tok.isAnyIdentifier()))
return TT_BinaryOperator;
// "&&(" is quite unlikely to be two successive unary "&".
if (Tok.is(tok::ampamp) && NextToken->is(tok::l_paren))
return TT_BinaryOperator;
// This catches some cases where evaluation order is used as control flow:
// aaa && aaa->f();
if (NextToken->Tok.isAnyIdentifier()) {
const FormatToken *NextNextToken = NextToken->getNextNonComment();
if (NextNextToken && NextNextToken->is(tok::arrow))
return TT_BinaryOperator;
}
// It is very unlikely that we are going to find a pointer or reference type
// definition on the RHS of an assignment.
if (IsExpression && !Contexts.back().CaretFound)
return TT_BinaryOperator;
return TT_PointerOrReference;
}
TokenType determinePlusMinusCaretUsage(const FormatToken &Tok) {
const FormatToken *PrevToken = Tok.getPreviousNonComment();
if (!PrevToken)
return TT_UnaryOperator;
if (PrevToken->isOneOf(TT_CastRParen, TT_UnaryOperator))
// This must be a sequence of leading unary operators.
return TT_UnaryOperator;
// Use heuristics to recognize unary operators.
if (PrevToken->isOneOf(tok::equal, tok::l_paren, tok::comma, tok::l_square,
tok::question, tok::colon, tok::kw_return,
tok::kw_case, tok::at, tok::l_brace, tok::kw_throw,
tok::kw_co_return, tok::kw_co_yield))
return TT_UnaryOperator;
// There can't be two consecutive binary operators.
if (PrevToken->is(TT_BinaryOperator))
return TT_UnaryOperator;
// Fall back to marking the token as binary operator.
return TT_BinaryOperator;
}
/// Determine whether ++/-- are pre- or post-increments/-decrements.
TokenType determineIncrementUsage(const FormatToken &Tok) {
const FormatToken *PrevToken = Tok.getPreviousNonComment();
if (!PrevToken || PrevToken->is(TT_CastRParen))
return TT_UnaryOperator;
if (PrevToken->isOneOf(tok::r_paren, tok::r_square, tok::identifier))
return TT_TrailingUnaryOperator;
return TT_UnaryOperator;
}
SmallVector<Context, 8> Contexts;
const FormatStyle &Style;
AnnotatedLine &Line;
FormatToken *CurrentToken;
bool AutoFound;
const AdditionalKeywords &Keywords;
// Set of "<" tokens that do not open a template parameter list. If parseAngle
// determines that a specific token can't be a template opener, it will make
// same decision irrespective of the decisions for tokens leading up to it.
// Store this information to prevent this from causing exponential runtime.
llvm::SmallPtrSet<FormatToken *, 16> NonTemplateLess;
};
static const int PrecedenceUnaryOperator = prec::PointerToMember + 1;
static const int PrecedenceArrowAndPeriod = prec::PointerToMember + 2;
/// Parses binary expressions by inserting fake parenthesis based on
/// operator precedence.
class ExpressionParser {
public:
ExpressionParser(const FormatStyle &Style, const AdditionalKeywords &Keywords,
AnnotatedLine &Line)
: Style(Style), Keywords(Keywords), Current(Line.First) {}
/// Parse expressions with the given operator precedence.
void parse(int Precedence = 0) {
// Skip 'return' and ObjC selector colons as they are not part of a binary
// expression.
while (Current && (Current->is(tok::kw_return) ||
(Current->is(tok::colon) &&
Current->isOneOf(TT_ObjCMethodExpr, TT_DictLiteral))))
next();
if (!Current || Precedence > PrecedenceArrowAndPeriod)
return;
// Conditional expressions need to be parsed separately for proper nesting.
if (Precedence == prec::Conditional) {
parseConditionalExpr();
return;
}
// Parse unary operators, which all have a higher precedence than binary
// operators.
if (Precedence == PrecedenceUnaryOperator) {
parseUnaryOperator();
return;
}
FormatToken *Start = Current;
FormatToken *LatestOperator = nullptr;
unsigned OperatorIndex = 0;
while (Current) {
// Consume operators with higher precedence.
parse(Precedence + 1);
int CurrentPrecedence = getCurrentPrecedence();
if (Current && Current->is(TT_SelectorName) &&
Precedence == CurrentPrecedence) {
if (LatestOperator)
addFakeParenthesis(Start, prec::Level(Precedence));
Start = Current;
}
// At the end of the line or when an operator with higher precedence is
// found, insert fake parenthesis and return.
if (!Current ||
(Current->closesScope() &&
(Current->MatchingParen || Current->is(TT_TemplateString))) ||
(CurrentPrecedence != -1 && CurrentPrecedence < Precedence) ||
(CurrentPrecedence == prec::Conditional &&
Precedence == prec::Assignment && Current->is(tok::colon))) {
break;
}
// Consume scopes: (), [], <> and {}
if (Current->opensScope()) {
// In fragment of a JavaScript template string can look like '}..${' and
// thus close a scope and open a new one at the same time.
while (Current && (!Current->closesScope() || Current->opensScope())) {
next();
parse();
}
next();
} else {
// Operator found.
if (CurrentPrecedence == Precedence) {
if (LatestOperator)
LatestOperator->NextOperator = Current;
LatestOperator = Current;
Current->OperatorIndex = OperatorIndex;
++OperatorIndex;
}
next(/*SkipPastLeadingComments=*/Precedence > 0);
}
}
if (LatestOperator && (Current || Precedence > 0)) {
// LatestOperator->LastOperator = true;
if (Precedence == PrecedenceArrowAndPeriod) {
// Call expressions don't have a binary operator precedence.
addFakeParenthesis(Start, prec::Unknown);
} else {
addFakeParenthesis(Start, prec::Level(Precedence));
}
}
}
private:
/// Gets the precedence (+1) of the given token for binary operators
/// and other tokens that we treat like binary operators.
int getCurrentPrecedence() {
if (Current) {
const FormatToken *NextNonComment = Current->getNextNonComment();
if (Current->is(TT_ConditionalExpr))
return prec::Conditional;
if (NextNonComment && Current->is(TT_SelectorName) &&
(NextNonComment->isOneOf(TT_DictLiteral, TT_JsTypeColon) ||
((Style.Language == FormatStyle::LK_Proto ||
Style.Language == FormatStyle::LK_TextProto) &&
NextNonComment->is(tok::less))))
return prec::Assignment;
if (Current->is(TT_JsComputedPropertyName))
return prec::Assignment;
if (Current->is(TT_LambdaArrow))
return prec::Comma;
if (Current->is(TT_FatArrow))
return prec::Assignment;
if (Current->isOneOf(tok::semi, TT_InlineASMColon, TT_SelectorName) ||
(Current->is(tok::comment) && NextNonComment &&
NextNonComment->is(TT_SelectorName)))
return 0;
if (Current->is(TT_RangeBasedForLoopColon))
return prec::Comma;
if ((Style.Language == FormatStyle::LK_Java ||
Style.Language == FormatStyle::LK_JavaScript) &&
Current->is(Keywords.kw_instanceof))
return prec::Relational;
if (Style.Language == FormatStyle::LK_JavaScript &&
Current->isOneOf(Keywords.kw_in, Keywords.kw_as))
return prec::Relational;
if (Current->is(TT_BinaryOperator) || Current->is(tok::comma))
return Current->getPrecedence();
if (Current->isOneOf(tok::period, tok::arrow))
return PrecedenceArrowAndPeriod;
if ((Style.Language == FormatStyle::LK_Java ||
Style.Language == FormatStyle::LK_JavaScript) &&
Current->isOneOf(Keywords.kw_extends, Keywords.kw_implements,
Keywords.kw_throws))
return 0;
}
return -1;
}
void addFakeParenthesis(FormatToken *Start, prec::Level Precedence) {
Start->FakeLParens.push_back(Precedence);
if (Precedence > prec::Unknown)
Start->StartsBinaryExpression = true;
if (Current) {
FormatToken *Previous = Current->Previous;
while (Previous->is(tok::comment) && Previous->Previous)
Previous = Previous->Previous;
++Previous->FakeRParens;
if (Precedence > prec::Unknown)
Previous->EndsBinaryExpression = true;
}
}
/// Parse unary operator expressions and surround them with fake
/// parentheses if appropriate.
void parseUnaryOperator() {
llvm::SmallVector<FormatToken *, 2> Tokens;
while (Current && Current->is(TT_UnaryOperator)) {
Tokens.push_back(Current);
next();
}
parse(PrecedenceArrowAndPeriod);
for (FormatToken *Token : llvm::reverse(Tokens))
// The actual precedence doesn't matter.
addFakeParenthesis(Token, prec::Unknown);
}
void parseConditionalExpr() {
while (Current && Current->isTrailingComment()) {
next();
}
FormatToken *Start = Current;
parse(prec::LogicalOr);
if (!Current || !Current->is(tok::question))
return;
next();
parse(prec::Assignment);
if (!Current || Current->isNot(TT_ConditionalExpr))
return;
next();
parse(prec::Assignment);
addFakeParenthesis(Start, prec::Conditional);
}
void next(bool SkipPastLeadingComments = true) {
if (Current)
Current = Current->Next;
while (Current &&
(Current->NewlinesBefore == 0 || SkipPastLeadingComments) &&
Current->isTrailingComment())
Current = Current->Next;
}
const FormatStyle &Style;
const AdditionalKeywords &Keywords;
FormatToken *Current;
};
} // end anonymous namespace
void TokenAnnotator::setCommentLineLevels(
SmallVectorImpl<AnnotatedLine *> &Lines) {
const AnnotatedLine *NextNonCommentLine = nullptr;
for (SmallVectorImpl<AnnotatedLine *>::reverse_iterator I = Lines.rbegin(),
E = Lines.rend();
I != E; ++I) {
bool CommentLine = true;
for (const FormatToken *Tok = (*I)->First; Tok; Tok = Tok->Next) {
if (!Tok->is(tok::comment)) {
CommentLine = false;
break;
}
}
// If the comment is currently aligned with the line immediately following
// it, that's probably intentional and we should keep it.
if (NextNonCommentLine && CommentLine &&
NextNonCommentLine->First->NewlinesBefore <= 1 &&
NextNonCommentLine->First->OriginalColumn ==
(*I)->First->OriginalColumn) {
// Align comments for preprocessor lines with the # in column 0 if
// preprocessor lines are not indented. Otherwise, align with the next
// line.
(*I)->Level =
(Style.IndentPPDirectives != FormatStyle::PPDIS_BeforeHash &&
(NextNonCommentLine->Type == LT_PreprocessorDirective ||
NextNonCommentLine->Type == LT_ImportStatement))
? 0
: NextNonCommentLine->Level;
} else {
NextNonCommentLine = (*I)->First->isNot(tok::r_brace) ? (*I) : nullptr;
}
setCommentLineLevels((*I)->Children);
}
}
static unsigned maxNestingDepth(const AnnotatedLine &Line) {
unsigned Result = 0;
for (const auto *Tok = Line.First; Tok != nullptr; Tok = Tok->Next)
Result = std::max(Result, Tok->NestingLevel);
return Result;
}
void TokenAnnotator::annotate(AnnotatedLine &Line) {
for (SmallVectorImpl<AnnotatedLine *>::iterator I = Line.Children.begin(),
E = Line.Children.end();
I != E; ++I) {
annotate(**I);
}
AnnotatingParser Parser(Style, Line, Keywords);
Line.Type = Parser.parseLine();
// With very deep nesting, ExpressionParser uses lots of stack and the
// formatting algorithm is very slow. We're not going to do a good job here
// anyway - it's probably generated code being formatted by mistake.
// Just skip the whole line.
if (maxNestingDepth(Line) > 50)
Line.Type = LT_Invalid;
if (Line.Type == LT_Invalid)
return;
ExpressionParser ExprParser(Style, Keywords, Line);
ExprParser.parse();
if (Line.startsWith(TT_ObjCMethodSpecifier))
Line.Type = LT_ObjCMethodDecl;
else if (Line.startsWith(TT_ObjCDecl))
Line.Type = LT_ObjCDecl;
else if (Line.startsWith(TT_ObjCProperty))
Line.Type = LT_ObjCProperty;
Line.First->SpacesRequiredBefore = 1;
Line.First->CanBreakBefore = Line.First->MustBreakBefore;
}
// This function heuristically determines whether 'Current' starts the name of a
// function declaration.
static bool isFunctionDeclarationName(const FormatToken &Current,
const AnnotatedLine &Line) {
auto skipOperatorName = [](const FormatToken *Next) -> const FormatToken * {
for (; Next; Next = Next->Next) {
if (Next->is(TT_OverloadedOperatorLParen))
return Next;
if (Next->is(TT_OverloadedOperator))
continue;
if (Next->isOneOf(tok::kw_new, tok::kw_delete)) {
// For 'new[]' and 'delete[]'.
if (Next->Next &&
Next->Next->startsSequence(tok::l_square, tok::r_square))
Next = Next->Next->Next;
continue;
}
if (Next->startsSequence(tok::l_square, tok::r_square)) {
// For operator[]().
Next = Next->Next;
continue;
}
if ((Next->isSimpleTypeSpecifier() || Next->is(tok::identifier)) &&
Next->Next && Next->Next->isOneOf(tok::star, tok::amp, tok::ampamp)) {
// For operator void*(), operator char*(), operator Foo*().
Next = Next->Next;
continue;
}
if (Next->is(TT_TemplateOpener) && Next->MatchingParen) {
Next = Next->MatchingParen;
continue;
}
break;
}
return nullptr;
};
// Find parentheses of parameter list.
const FormatToken *Next = Current.Next;
if (Current.is(tok::kw_operator)) {
if (Current.Previous && Current.Previous->is(tok::coloncolon))
return false;
Next = skipOperatorName(Next);
} else {
if (!Current.is(TT_StartOfName) || Current.NestingLevel != 0)
return false;
for (; Next; Next = Next->Next) {
if (Next->is(TT_TemplateOpener)) {
Next = Next->MatchingParen;
} else if (Next->is(tok::coloncolon)) {
Next = Next->Next;
if (!Next)
return false;
if (Next->is(tok::kw_operator)) {
Next = skipOperatorName(Next->Next);
break;
}
if (!Next->is(tok::identifier))
return false;
} else if (Next->is(tok::l_paren)) {
break;
} else {
return false;
}
}
}
// Check whether parameter list can belong to a function declaration.
if (!Next || !Next->is(tok::l_paren) || !Next->MatchingParen)
return false;
// If the lines ends with "{", this is likely an function definition.
if (Line.Last->is(tok::l_brace))
return true;
if (Next->Next == Next->MatchingParen)
return true; // Empty parentheses.
// If there is an &/&& after the r_paren, this is likely a function.
if (Next->MatchingParen->Next &&
Next->MatchingParen->Next->is(TT_PointerOrReference))
return true;
for (const FormatToken *Tok = Next->Next; Tok && Tok != Next->MatchingParen;
Tok = Tok->Next) {
if (Tok->is(TT_TypeDeclarationParen))
return true;
if (Tok->isOneOf(tok::l_paren, TT_TemplateOpener) && Tok->MatchingParen) {
Tok = Tok->MatchingParen;
continue;
}
if (Tok->is(tok::kw_const) || Tok->isSimpleTypeSpecifier() ||
Tok->isOneOf(TT_PointerOrReference, TT_StartOfName, tok::ellipsis))
return true;
if (Tok->isOneOf(tok::l_brace, tok::string_literal, TT_ObjCMethodExpr) ||
Tok->Tok.isLiteral())
return false;
}
return false;
}
bool TokenAnnotator::mustBreakForReturnType(const AnnotatedLine &Line) const {
assert(Line.MightBeFunctionDecl);
if ((Style.AlwaysBreakAfterReturnType == FormatStyle::RTBS_TopLevel ||
Style.AlwaysBreakAfterReturnType ==
FormatStyle::RTBS_TopLevelDefinitions) &&
Line.Level > 0)
return false;
switch (Style.AlwaysBreakAfterReturnType) {
case FormatStyle::RTBS_None:
return false;
case FormatStyle::RTBS_All:
case FormatStyle::RTBS_TopLevel:
return true;
case FormatStyle::RTBS_AllDefinitions:
case FormatStyle::RTBS_TopLevelDefinitions:
return Line.mightBeFunctionDefinition();
}
return false;
}
void TokenAnnotator::calculateFormattingInformation(AnnotatedLine &Line) {
for (SmallVectorImpl<AnnotatedLine *>::iterator I = Line.Children.begin(),
E = Line.Children.end();
I != E; ++I) {
calculateFormattingInformation(**I);
}
Line.First->TotalLength =
Line.First->IsMultiline ? Style.ColumnLimit
: Line.FirstStartColumn + Line.First->ColumnWidth;
FormatToken *Current = Line.First->Next;
bool InFunctionDecl = Line.MightBeFunctionDecl;
while (Current) {
if (isFunctionDeclarationName(*Current, Line))
Current->setType(TT_FunctionDeclarationName);
if (Current->is(TT_LineComment)) {
if (Current->Previous->is(BK_BracedInit) &&
Current->Previous->opensScope())
Current->SpacesRequiredBefore =
(Style.Cpp11BracedListStyle && !Style.SpacesInParentheses) ? 0 : 1;
else
Current->SpacesRequiredBefore = Style.SpacesBeforeTrailingComments;
// If we find a trailing comment, iterate backwards to determine whether
// it seems to relate to a specific parameter. If so, break before that
// parameter to avoid changing the comment's meaning. E.g. don't move 'b'
// to the previous line in:
// SomeFunction(a,
// b, // comment
// c);
if (!Current->HasUnescapedNewline) {
for (FormatToken *Parameter = Current->Previous; Parameter;
Parameter = Parameter->Previous) {
if (Parameter->isOneOf(tok::comment, tok::r_brace))
break;
if (Parameter->Previous && Parameter->Previous->is(tok::comma)) {
if (!Parameter->Previous->is(TT_CtorInitializerComma) &&
Parameter->HasUnescapedNewline)
Parameter->MustBreakBefore = true;
break;
}
}
}
} else if (Current->SpacesRequiredBefore == 0 &&
spaceRequiredBefore(Line, *Current)) {
Current->SpacesRequiredBefore = 1;
}
Current->MustBreakBefore =
Current->MustBreakBefore || mustBreakBefore(Line, *Current);
if (!Current->MustBreakBefore && InFunctionDecl &&
Current->is(TT_FunctionDeclarationName))
Current->MustBreakBefore = mustBreakForReturnType(Line);
Current->CanBreakBefore =
Current->MustBreakBefore || canBreakBefore(Line, *Current);
unsigned ChildSize = 0;
if (Current->Previous->Children.size() == 1) {
FormatToken &LastOfChild = *Current->Previous->Children[0]->Last;
ChildSize = LastOfChild.isTrailingComment() ? Style.ColumnLimit
: LastOfChild.TotalLength + 1;
}
const FormatToken *Prev = Current->Previous;
if (Current->MustBreakBefore || Prev->Children.size() > 1 ||
(Prev->Children.size() == 1 &&
Prev->Children[0]->First->MustBreakBefore) ||
Current->IsMultiline)
Current->TotalLength = Prev->TotalLength + Style.ColumnLimit;
else
Current->TotalLength = Prev->TotalLength + Current->ColumnWidth +
ChildSize + Current->SpacesRequiredBefore;
if (Current->is(TT_CtorInitializerColon))
InFunctionDecl = false;
// FIXME: Only calculate this if CanBreakBefore is true once static
// initializers etc. are sorted out.
// FIXME: Move magic numbers to a better place.
// Reduce penalty for aligning ObjC method arguments using the colon
// alignment as this is the canonical way (still prefer fitting everything
// into one line if possible). Trying to fit a whole expression into one
// line should not force other line breaks (e.g. when ObjC method
// expression is a part of other expression).
Current->SplitPenalty = splitPenalty(Line, *Current, InFunctionDecl);
if (Style.Language == FormatStyle::LK_ObjC &&
Current->is(TT_SelectorName) && Current->ParameterIndex > 0) {
if (Current->ParameterIndex == 1)
Current->SplitPenalty += 5 * Current->BindingStrength;
} else {
Current->SplitPenalty += 20 * Current->BindingStrength;
}
Current = Current->Next;
}
calculateUnbreakableTailLengths(Line);
unsigned IndentLevel = Line.Level;
for (Current = Line.First; Current != nullptr; Current = Current->Next) {
if (Current->Role)
Current->Role->precomputeFormattingInfos(Current);
if (Current->MatchingParen &&
Current->MatchingParen->opensBlockOrBlockTypeList(Style)) {
assert(IndentLevel > 0);
--IndentLevel;
}
Current->IndentLevel = IndentLevel;
if (Current->opensBlockOrBlockTypeList(Style))
++IndentLevel;
}
LLVM_DEBUG({ printDebugInfo(Line); });
}
void TokenAnnotator::calculateUnbreakableTailLengths(AnnotatedLine &Line) {
unsigned UnbreakableTailLength = 0;
FormatToken *Current = Line.Last;
while (Current) {
Current->UnbreakableTailLength = UnbreakableTailLength;
if (Current->CanBreakBefore ||
Current->isOneOf(tok::comment, tok::string_literal)) {
UnbreakableTailLength = 0;
} else {
UnbreakableTailLength +=
Current->ColumnWidth + Current->SpacesRequiredBefore;
}
Current = Current->Previous;
}
}
unsigned TokenAnnotator::splitPenalty(const AnnotatedLine &Line,
const FormatToken &Tok,
bool InFunctionDecl) {
const FormatToken &Left = *Tok.Previous;
const FormatToken &Right = Tok;
if (Left.is(tok::semi))
return 0;
if (Style.Language == FormatStyle::LK_Java) {
if (Right.isOneOf(Keywords.kw_extends, Keywords.kw_throws))
return 1;
if (Right.is(Keywords.kw_implements))
return 2;
if (Left.is(tok::comma) && Left.NestingLevel == 0)
return 3;
} else if (Style.Language == FormatStyle::LK_JavaScript) {
if (Right.is(Keywords.kw_function) && Left.isNot(tok::comma))
return 100;
if (Left.is(TT_JsTypeColon))
return 35;
if ((Left.is(TT_TemplateString) && Left.TokenText.endswith("${")) ||
(Right.is(TT_TemplateString) && Right.TokenText.startswith("}")))
return 100;
// Prefer breaking call chains (".foo") over empty "{}", "[]" or "()".
if (Left.opensScope() && Right.closesScope())
return 200;
}
if (Right.is(tok::identifier) && Right.Next && Right.Next->is(TT_DictLiteral))
return 1;
if (Right.is(tok::l_square)) {
if (Style.Language == FormatStyle::LK_Proto)
return 1;
if (Left.is(tok::r_square))
return 200;
// Slightly prefer formatting local lambda definitions like functions.
if (Right.is(TT_LambdaLSquare) && Left.is(tok::equal))
return 35;
if (!Right.isOneOf(TT_ObjCMethodExpr, TT_LambdaLSquare,
TT_ArrayInitializerLSquare,
TT_DesignatedInitializerLSquare, TT_AttributeSquare))
return 500;
}
if (Left.is(tok::coloncolon) ||
(Right.is(tok::period) && Style.Language == FormatStyle::LK_Proto))
return 500;
if (Right.isOneOf(TT_StartOfName, TT_FunctionDeclarationName) ||
Right.is(tok::kw_operator)) {
if (Line.startsWith(tok::kw_for) && Right.PartOfMultiVariableDeclStmt)
return 3;
if (Left.is(TT_StartOfName))
return 110;
if (InFunctionDecl && Right.NestingLevel == 0)
return Style.PenaltyReturnTypeOnItsOwnLine;
return 200;
}
if (Right.is(TT_PointerOrReference))
return 190;
if (Right.is(TT_LambdaArrow))
return 110;
if (Left.is(tok::equal) && Right.is(tok::l_brace))
return 160;
if (Left.is(TT_CastRParen))
return 100;
if (Left.isOneOf(tok::kw_class, tok::kw_struct))
return 5000;
if (Left.is(tok::comment))
return 1000;
if (Left.isOneOf(TT_RangeBasedForLoopColon, TT_InheritanceColon,
TT_CtorInitializerColon))
return 2;
if (Right.isMemberAccess()) {
// Breaking before the "./->" of a chained call/member access is reasonably
// cheap, as formatting those with one call per line is generally
// desirable. In particular, it should be cheaper to break before the call
// than it is to break inside a call's parameters, which could lead to weird
// "hanging" indents. The exception is the very last "./->" to support this
// frequent pattern:
//
// aaaaaaaa.aaaaaaaa.bbbbbbb().ccccccccccccccccccccc(
// dddddddd);
//
// which might otherwise be blown up onto many lines. Here, clang-format
// won't produce "hanging" indents anyway as there is no other trailing
// call.
//
// Also apply higher penalty is not a call as that might lead to a wrapping
// like:
//
// aaaaaaa
// .aaaaaaaaa.bbbbbbbb(cccccccc);
return !Right.NextOperator || !Right.NextOperator->Previous->closesScope()
? 150
: 35;
}
if (Right.is(TT_TrailingAnnotation) &&
(!Right.Next || Right.Next->isNot(tok::l_paren))) {
// Moving trailing annotations to the next line is fine for ObjC method
// declarations.
if (Line.startsWith(TT_ObjCMethodSpecifier))
return 10;
// Generally, breaking before a trailing annotation is bad unless it is
// function-like. It seems to be especially preferable to keep standard
// annotations (i.e. "const", "final" and "override") on the same line.
// Use a slightly higher penalty after ")" so that annotations like
// "const override" are kept together.
bool is_short_annotation = Right.TokenText.size() < 10;
return (Left.is(tok::r_paren) ? 100 : 120) + (is_short_annotation ? 50 : 0);
}
// In for-loops, prefer breaking at ',' and ';'.
if (Line.startsWith(tok::kw_for) && Left.is(tok::equal))
return 4;
// In Objective-C method expressions, prefer breaking before "param:" over
// breaking after it.
if (Right.is(TT_SelectorName))
return 0;
if (Left.is(tok::colon) && Left.is(TT_ObjCMethodExpr))
return Line.MightBeFunctionDecl ? 50 : 500;
// In Objective-C type declarations, avoid breaking after the category's
// open paren (we'll prefer breaking after the protocol list's opening
// angle bracket, if present).
if (Line.Type == LT_ObjCDecl && Left.is(tok::l_paren) && Left.Previous &&
Left.Previous->isOneOf(tok::identifier, tok::greater))
return 500;
if (Left.is(tok::l_paren) && InFunctionDecl &&
Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign)
return 100;
if (Left.is(tok::l_paren) && Left.Previous &&
(Left.Previous->is(tok::kw_for) || Left.Previous->isIf()))
return 1000;
if (Left.is(tok::equal) && InFunctionDecl)
return 110;
if (Right.is(tok::r_brace))
return 1;
if (Left.is(TT_TemplateOpener))
return 100;
if (Left.opensScope()) {
// If we aren't aligning after opening parens/braces we can always break
// here unless the style does not want us to place all arguments on the
// next line.
if (Style.AlignAfterOpenBracket == FormatStyle::BAS_DontAlign &&
(Left.ParameterCount <= 1 || Style.AllowAllArgumentsOnNextLine))
return 0;
if (Left.is(tok::l_brace) && !Style.Cpp11BracedListStyle)
return 19;
return Left.ParameterCount > 1 ? Style.PenaltyBreakBeforeFirstCallParameter
: 19;
}
if (Left.is(TT_JavaAnnotation))
return 50;
if (Left.is(TT_UnaryOperator))
return 60;
if (Left.isOneOf(tok::plus, tok::comma) && Left.Previous &&
Left.Previous->isLabelString() &&
(Left.NextOperator || Left.OperatorIndex != 0))
return 50;
if (Right.is(tok::plus) && Left.isLabelString() &&
(Right.NextOperator || Right.OperatorIndex != 0))
return 25;
if (Left.is(tok::comma))
return 1;
if (Right.is(tok::lessless) && Left.isLabelString() &&
(Right.NextOperator || Right.OperatorIndex != 1))
return 25;
if (Right.is(tok::lessless)) {
// Breaking at a << is really cheap.
if (!Left.is(tok::r_paren) || Right.OperatorIndex > 0)
// Slightly prefer to break before the first one in log-like statements.
return 2;
return 1;
}
if (Left.ClosesTemplateDeclaration)
return Style.PenaltyBreakTemplateDeclaration;
if (Left.is(TT_ConditionalExpr))
return prec::Conditional;
prec::Level Level = Left.getPrecedence();
if (Level == prec::Unknown)
Level = Right.getPrecedence();
if (Level == prec::Assignment)
return Style.PenaltyBreakAssignment;
if (Level != prec::Unknown)
return Level;
return 3;
}
bool TokenAnnotator::spaceRequiredBeforeParens(const FormatToken &Right) const {
return Style.SpaceBeforeParens == FormatStyle::SBPO_Always ||
(Style.SpaceBeforeParens == FormatStyle::SBPO_NonEmptyParentheses &&
Right.ParameterCount > 0);
}
bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
const FormatToken &Left,
const FormatToken &Right) {
if (Left.is(tok::kw_return) && Right.isNot(tok::semi))
return true;
if (Left.is(Keywords.kw_assert) && Style.Language == FormatStyle::LK_Java)
return true;
if (Style.ObjCSpaceAfterProperty && Line.Type == LT_ObjCProperty &&
Left.Tok.getObjCKeywordID() == tok::objc_property)
return true;
if (Right.is(tok::hashhash))
return Left.is(tok::hash);
if (Left.isOneOf(tok::hashhash, tok::hash))
return Right.is(tok::hash);
if ((Left.is(tok::l_paren) && Right.is(tok::r_paren)) ||
(Left.is(tok::l_brace) && Left.isNot(BK_Block) &&
Right.is(tok::r_brace) && Right.isNot(BK_Block)))
return Style.SpaceInEmptyParentheses;
if (Style.SpacesInConditionalStatement) {
if (Left.is(tok::l_paren) && Left.Previous &&
isKeywordWithCondition(*Left.Previous))
return true;
if (Right.is(tok::r_paren) && Right.MatchingParen &&
Right.MatchingParen->Previous &&
isKeywordWithCondition(*Right.MatchingParen->Previous))
return true;
}
// requires ( or requires(
if (Right.is(tok::l_paren) && Left.is(tok::kw_requires))
return spaceRequiredBeforeParens(Right);
// requires clause Concept1<T> && Concept2<T>
if (Left.is(TT_ConstraintJunctions) && Right.is(tok::identifier))
return true;
if (Left.is(tok::l_paren) || Right.is(tok::r_paren))
return (Right.is(TT_CastRParen) ||
(Left.MatchingParen && Left.MatchingParen->is(TT_CastRParen)))
? Style.SpacesInCStyleCastParentheses
: Style.SpacesInParentheses;
if (Right.isOneOf(tok::semi, tok::comma))
return false;
if (Right.is(tok::less) && Line.Type == LT_ObjCDecl) {
bool IsLightweightGeneric = Right.MatchingParen &&
Right.MatchingParen->Next &&
Right.MatchingParen->Next->is(tok::colon);
return !IsLightweightGeneric && Style.ObjCSpaceBeforeProtocolList;
}
if (Right.is(tok::less) && Left.is(tok::kw_template))
return Style.SpaceAfterTemplateKeyword;
if (Left.isOneOf(tok::exclaim, tok::tilde))
return false;
if (Left.is(tok::at) &&
Right.isOneOf(tok::identifier, tok::string_literal, tok::char_constant,
tok::numeric_constant, tok::l_paren, tok::l_brace,
tok::kw_true, tok::kw_false))
return false;
if (Left.is(tok::colon))
return !Left.is(TT_ObjCMethodExpr);
if (Left.is(tok::coloncolon))
return false;
if (Left.is(tok::less) || Right.isOneOf(tok::greater, tok::less)) {
if (Style.Language == FormatStyle::LK_TextProto ||
(Style.Language == FormatStyle::LK_Proto &&
(Left.is(TT_DictLiteral) || Right.is(TT_DictLiteral)))) {
// Format empty list as `<>`.
if (Left.is(tok::less) && Right.is(tok::greater))
return false;
return !Style.Cpp11BracedListStyle;
}
return false;
}
if (Right.is(tok::ellipsis))
return Left.Tok.isLiteral() || (Left.is(tok::identifier) && Left.Previous &&
Left.Previous->is(tok::kw_case));
if (Left.is(tok::l_square) && Right.is(tok::amp))
return Style.SpacesInSquareBrackets;
if (Right.is(TT_PointerOrReference)) {
if (Left.is(tok::r_paren) && Line.MightBeFunctionDecl) {
if (!Left.MatchingParen)
return true;
FormatToken *TokenBeforeMatchingParen =
Left.MatchingParen->getPreviousNonComment();
if (!TokenBeforeMatchingParen || !Left.is(TT_TypeDeclarationParen))
return true;
}
// Add a space if the previous token is a pointer qualifer or the closing
// parenthesis of __attribute__(()) expression and the style requires spaces
// after pointer qualifiers.
if ((Style.SpaceAroundPointerQualifiers == FormatStyle::SAPQ_After ||
Style.SpaceAroundPointerQualifiers == FormatStyle::SAPQ_Both) &&
(Left.is(TT_AttributeParen) || Left.canBePointerOrReferenceQualifier()))
return true;
return (Left.Tok.isLiteral() ||
(!Left.isOneOf(TT_PointerOrReference, tok::l_paren) &&
(Style.PointerAlignment != FormatStyle::PAS_Left ||
(Line.IsMultiVariableDeclStmt &&
(Left.NestingLevel == 0 ||
(Left.NestingLevel == 1 && Line.First->is(tok::kw_for)))))));
}
if (Right.is(TT_FunctionTypeLParen) && Left.isNot(tok::l_paren) &&
(!Left.is(TT_PointerOrReference) ||
(Style.PointerAlignment != FormatStyle::PAS_Right &&
!Line.IsMultiVariableDeclStmt)))
return true;
if (Left.is(TT_PointerOrReference)) {
// Add a space if the next token is a pointer qualifer and the style
// requires spaces before pointer qualifiers.
if ((Style.SpaceAroundPointerQualifiers == FormatStyle::SAPQ_Before ||
Style.SpaceAroundPointerQualifiers == FormatStyle::SAPQ_Both) &&
Right.canBePointerOrReferenceQualifier())
return true;
return Right.Tok.isLiteral() || Right.is(TT_BlockComment) ||
(Right.isOneOf(Keywords.kw_override, Keywords.kw_final) &&
!Right.is(TT_StartOfName)) ||
(Right.is(tok::l_brace) && Right.is(BK_Block)) ||
(!Right.isOneOf(TT_PointerOrReference, TT_ArraySubscriptLSquare,
tok::l_paren) &&
(Style.PointerAlignment != FormatStyle::PAS_Right &&
!Line.IsMultiVariableDeclStmt) &&
Left.Previous &&
!Left.Previous->isOneOf(tok::l_paren, tok::coloncolon,
tok::l_square));
}
// Ensure right pointer alignement with ellipsis e.g. int *...P
if (Left.is(tok::ellipsis) && Left.Previous &&
Left.Previous->isOneOf(tok::star, tok::amp, tok::ampamp))
return Style.PointerAlignment != FormatStyle::PAS_Right;
if (Right.is(tok::star) && Left.is(tok::l_paren))
return false;
if (Left.is(tok::star) && Right.isOneOf(tok::star, tok::amp, tok::ampamp))
return false;
if (Right.isOneOf(tok::star, tok::amp, tok::ampamp)) {
const FormatToken *Previous = &Left;
while (Previous && !Previous->is(tok::kw_operator)) {
if (Previous->is(tok::identifier) || Previous->isSimpleTypeSpecifier()) {
Previous = Previous->getPreviousNonComment();
continue;
}
if (Previous->is(TT_TemplateCloser) && Previous->MatchingParen) {
Previous = Previous->MatchingParen->getPreviousNonComment();
continue;
}
if (Previous->is(tok::coloncolon)) {
Previous = Previous->getPreviousNonComment();
continue;
}
break;
}
// Space between the type and the * in:
// operator void*()
// operator char*()
// operator void const*()
// operator void volatile*()
// operator /*comment*/ const char*()
// operator volatile /*comment*/ char*()
// operator Foo*()
// operator C<T>*()
// operator std::Foo*()
// operator C<T>::D<U>*()
// dependent on PointerAlignment style.
if (Previous) {
if (Previous->endsSequence(tok::kw_operator))
return (Style.PointerAlignment != FormatStyle::PAS_Left);
if (Previous->is(tok::kw_const) || Previous->is(tok::kw_volatile))
return (Style.PointerAlignment != FormatStyle::PAS_Left) ||
(Style.SpaceAroundPointerQualifiers ==
FormatStyle::SAPQ_After) ||
(Style.SpaceAroundPointerQualifiers == FormatStyle::SAPQ_Both);
}
}
const auto SpaceRequiredForArrayInitializerLSquare =
[](const FormatToken &LSquareTok, const FormatStyle &Style) {
return Style.SpacesInContainerLiterals ||
((Style.Language == FormatStyle::LK_Proto ||
Style.Language == FormatStyle::LK_TextProto) &&
!Style.Cpp11BracedListStyle &&
LSquareTok.endsSequence(tok::l_square, tok::colon,
TT_SelectorName));
};
if (Left.is(tok::l_square))
return (Left.is(TT_ArrayInitializerLSquare) && Right.isNot(tok::r_square) &&
SpaceRequiredForArrayInitializerLSquare(Left, Style)) ||
(Left.isOneOf(TT_ArraySubscriptLSquare, TT_StructuredBindingLSquare,
TT_LambdaLSquare) &&
Style.SpacesInSquareBrackets && Right.isNot(tok::r_square));
if (Right.is(tok::r_square))
return Right.MatchingParen &&
((Right.MatchingParen->is(TT_ArrayInitializerLSquare) &&
SpaceRequiredForArrayInitializerLSquare(*Right.MatchingParen,
Style)) ||
(Style.SpacesInSquareBrackets &&
Right.MatchingParen->isOneOf(TT_ArraySubscriptLSquare,
TT_StructuredBindingLSquare,
TT_LambdaLSquare)) ||
Right.MatchingParen->is(TT_AttributeParen));
if (Right.is(tok::l_square) &&
!Right.isOneOf(TT_ObjCMethodExpr, TT_LambdaLSquare,
TT_DesignatedInitializerLSquare,
TT_StructuredBindingLSquare, TT_AttributeSquare) &&
!Left.isOneOf(tok::numeric_constant, TT_DictLiteral) &&
!(!Left.is(tok::r_square) && Style.SpaceBeforeSquareBrackets &&
Right.is(TT_ArraySubscriptLSquare)))
return false;
if (Left.is(tok::l_brace) && Right.is(tok::r_brace))
return !Left.Children.empty(); // No spaces in "{}".
if ((Left.is(tok::l_brace) && Left.isNot(BK_Block)) ||
(Right.is(tok::r_brace) && Right.MatchingParen &&
Right.MatchingParen->isNot(BK_Block)))
return Style.Cpp11BracedListStyle ? Style.SpacesInParentheses : true;
if (Left.is(TT_BlockComment))
// No whitespace in x(/*foo=*/1), except for JavaScript.
return Style.Language == FormatStyle::LK_JavaScript ||
!Left.TokenText.endswith("=*/");
// Space between template and attribute.
// e.g. template <typename T> [[nodiscard]] ...
if (Left.is(TT_TemplateCloser) && Right.is(TT_AttributeSquare))
return true;
if (Right.is(tok::l_paren)) {
if ((Left.is(tok::r_paren) && Left.is(TT_AttributeParen)) ||
(Left.is(tok::r_square) && Left.is(TT_AttributeSquare)))
return true;
if (Style.SpaceBeforeParens ==
FormatStyle::SBPO_ControlStatementsExceptForEachMacros &&
Left.is(TT_ForEachMacro))
return false;
return Line.Type == LT_ObjCDecl || Left.is(tok::semi) ||
(Style.SpaceBeforeParens != FormatStyle::SBPO_Never &&
(Left.isOneOf(tok::pp_elif, tok::kw_for, tok::kw_while,
tok::kw_switch, tok::kw_case, TT_ForEachMacro,
TT_ObjCForIn) ||
Left.isIf(Line.Type != LT_PreprocessorDirective) ||
(Left.isOneOf(tok::kw_try, Keywords.kw___except, tok::kw_catch,
tok::kw_new, tok::kw_delete) &&
(!Left.Previous || Left.Previous->isNot(tok::period))))) ||
(spaceRequiredBeforeParens(Right) &&
(Left.is(tok::identifier) || Left.isFunctionLikeKeyword() ||
Left.is(tok::r_paren) || Left.isSimpleTypeSpecifier() ||
(Left.is(tok::r_square) && Left.MatchingParen &&
Left.MatchingParen->is(TT_LambdaLSquare))) &&
Line.Type != LT_PreprocessorDirective);
}
if (Left.is(tok::at) && Right.Tok.getObjCKeywordID() != tok::objc_not_keyword)
return false;
if (Right.is(TT_UnaryOperator))
return !Left.isOneOf(tok::l_paren, tok::l_square, tok::at) &&
(Left.isNot(tok::colon) || Left.isNot(TT_ObjCMethodExpr));
if ((Left.isOneOf(tok::identifier, tok::greater, tok::r_square,
tok::r_paren) ||
Left.isSimpleTypeSpecifier()) &&
Right.is(tok::l_brace) && Right.getNextNonComment() &&
Right.isNot(BK_Block))
return false;
if (Left.is(tok::period) || Right.is(tok::period))
return false;
if (Right.is(tok::hash) && Left.is(tok::identifier) && Left.TokenText == "L")
return false;
if (Left.is(TT_TemplateCloser) && Left.MatchingParen &&
Left.MatchingParen->Previous &&
(Left.MatchingParen->Previous->is(tok::period) ||
Left.MatchingParen->Previous->is(tok::coloncolon)))
// Java call to generic function with explicit type:
// A.<B<C<...>>>DoSomething();
// A::<B<C<...>>>DoSomething(); // With a Java 8 method reference.
return false;
if (Left.is(TT_TemplateCloser) && Right.is(tok::l_square))
return false;
if (Left.is(tok::l_brace) && Left.endsSequence(TT_DictLiteral, tok::at))
// Objective-C dictionary literal -> no space after opening brace.
return false;
if (Right.is(tok::r_brace) && Right.MatchingParen &&
Right.MatchingParen->endsSequence(TT_DictLiteral, tok::at))
// Objective-C dictionary literal -> no space before closing brace.
return false;
if (Right.getType() == TT_TrailingAnnotation &&
Right.isOneOf(tok::amp, tok::ampamp) &&
Left.isOneOf(tok::kw_const, tok::kw_volatile) &&
(!Right.Next || Right.Next->is(tok::semi)))
// Match const and volatile ref-qualifiers without any additional
// qualifiers such as
// void Fn() const &;
return Style.PointerAlignment != FormatStyle::PAS_Left;
return true;
}
bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
const FormatToken &Right) {
const FormatToken &Left = *Right.Previous;
auto HasExistingWhitespace = [&Right]() {
return Right.WhitespaceRange.getBegin() != Right.WhitespaceRange.getEnd();
};
if (Right.Tok.getIdentifierInfo() && Left.Tok.getIdentifierInfo())
return true; // Never ever merge two identifiers.
if (Style.isCpp()) {
if (Left.is(tok::kw_operator))
return Right.is(tok::coloncolon);
if (Right.is(tok::l_brace) && Right.is(BK_BracedInit) &&
!Left.opensScope() && Style.SpaceBeforeCpp11BracedList)
return true;
} else if (Style.Language == FormatStyle::LK_Proto ||
Style.Language == FormatStyle::LK_TextProto) {
if (Right.is(tok::period) &&
Left.isOneOf(Keywords.kw_optional, Keywords.kw_required,
Keywords.kw_repeated, Keywords.kw_extend))
return true;
if (Right.is(tok::l_paren) &&
Left.isOneOf(Keywords.kw_returns, Keywords.kw_option))
return true;
if (Right.isOneOf(tok::l_brace, tok::less) && Left.is(TT_SelectorName))
return true;
// Slashes occur in text protocol extension syntax: [type/type] { ... }.
if (Left.is(tok::slash) || Right.is(tok::slash))
return false;
if (Left.MatchingParen &&
Left.MatchingParen->is(TT_ProtoExtensionLSquare) &&
Right.isOneOf(tok::l_brace, tok::less))
return !Style.Cpp11BracedListStyle;
// A percent is probably part of a formatting specification, such as %lld.
if (Left.is(tok::percent))
return false;
// Preserve the existence of a space before a percent for cases like 0x%04x
// and "%d %d"
if (Left.is(tok::numeric_constant) && Right.is(tok::percent))
return HasExistingWhitespace();
} else if (Style.isCSharp()) {
// Require spaces around '{' and before '}' unless they appear in
// interpolated strings. Interpolated strings are merged into a single token
// so cannot have spaces inserted by this function.
// No space between 'this' and '['
if (Left.is(tok::kw_this) && Right.is(tok::l_square))
return false;
// No space between 'new' and '('
if (Left.is(tok::kw_new) && Right.is(tok::l_paren))
return false;
// Space before { (including space within '{ {').
if (Right.is(tok::l_brace))
return true;
// Spaces inside braces.
if (Left.is(tok::l_brace) && Right.isNot(tok::r_brace))
return true;
if (Left.isNot(tok::l_brace) && Right.is(tok::r_brace))
return true;
// Spaces around '=>'.
if (Left.is(TT_FatArrow) || Right.is(TT_FatArrow))
return true;
// No spaces around attribute target colons
if (Left.is(TT_AttributeColon) || Right.is(TT_AttributeColon))
return false;
// space between type and variable e.g. Dictionary<string,string> foo;
if (Left.is(TT_TemplateCloser) && Right.is(TT_StartOfName))
return true;
// spaces inside square brackets.
if (Left.is(tok::l_square) || Right.is(tok::r_square))
return Style.SpacesInSquareBrackets;
// No space before ? in nullable types.
if (Right.is(TT_CSharpNullable))
return false;
// No space before null forgiving '!'.
if (Right.is(TT_NonNullAssertion))
return false;
// No space between consecutive commas '[,,]'.
if (Left.is(tok::comma) && Right.is(tok::comma))
return false;
// space after var in `var (key, value)`
if (Left.is(Keywords.kw_var) && Right.is(tok::l_paren))
return true;
// space between keywords and paren e.g. "using ("
if (Right.is(tok::l_paren))
if (Left.isOneOf(tok::kw_using, Keywords.kw_async, Keywords.kw_when,
Keywords.kw_lock))
return Style.SpaceBeforeParens == FormatStyle::SBPO_ControlStatements ||
spaceRequiredBeforeParens(Right);
// space between method modifier and opening parenthesis of a tuple return
// type
if (Left.isOneOf(tok::kw_public, tok::kw_private, tok::kw_protected,
tok::kw_virtual, tok::kw_extern, tok::kw_static,
Keywords.kw_internal, Keywords.kw_abstract,
Keywords.kw_sealed, Keywords.kw_override,
Keywords.kw_async, Keywords.kw_unsafe) &&
Right.is(tok::l_paren))
return true;
} else if (Style.Language == FormatStyle::LK_JavaScript) {
if (Left.is(TT_FatArrow))
return true;
// for await ( ...
if (Right.is(tok::l_paren) && Left.is(Keywords.kw_await) && Left.Previous &&
Left.Previous->is(tok::kw_for))
return true;
if (Left.is(Keywords.kw_async) && Right.is(tok::l_paren) &&
Right.MatchingParen) {
const FormatToken *Next = Right.MatchingParen->getNextNonComment();
// An async arrow function, for example: `x = async () => foo();`,
// as opposed to calling a function called async: `x = async();`
if (Next && Next->is(TT_FatArrow))
return true;
}
if ((Left.is(TT_TemplateString) && Left.TokenText.endswith("${")) ||
(Right.is(TT_TemplateString) && Right.TokenText.startswith("}")))
return false;
// In tagged template literals ("html`bar baz`"), there is no space between
// the tag identifier and the template string.
if (Keywords.IsJavaScriptIdentifier(Left,
/* AcceptIdentifierName= */ false) &&
Right.is(TT_TemplateString))
return false;
if (Right.is(tok::star) &&
Left.isOneOf(Keywords.kw_function, Keywords.kw_yield))
return false;
if (Right.isOneOf(tok::l_brace, tok::l_square) &&
Left.isOneOf(Keywords.kw_function, Keywords.kw_yield,
Keywords.kw_extends, Keywords.kw_implements))
return true;
if (Right.is(tok::l_paren)) {
// JS methods can use some keywords as names (e.g. `delete()`).
if (Line.MustBeDeclaration && Left.Tok.getIdentifierInfo())
return false;
// Valid JS method names can include keywords, e.g. `foo.delete()` or
// `bar.instanceof()`. Recognize call positions by preceding period.
if (Left.Previous && Left.Previous->is(tok::period) &&
Left.Tok.getIdentifierInfo())
return false;
// Additional unary JavaScript operators that need a space after.
if (Left.isOneOf(tok::kw_throw, Keywords.kw_await, Keywords.kw_typeof,
tok::kw_void))
return true;
}
// `foo as const;` casts into a const type.
if (Left.endsSequence(tok::kw_const, Keywords.kw_as)) {
return false;
}
if ((Left.isOneOf(Keywords.kw_let, Keywords.kw_var, Keywords.kw_in,
tok::kw_const) ||
// "of" is only a keyword if it appears after another identifier
// (e.g. as "const x of y" in a for loop), or after a destructuring
// operation (const [x, y] of z, const {a, b} of c).
(Left.is(Keywords.kw_of) && Left.Previous &&
(Left.Previous->Tok.is(tok::identifier) ||
Left.Previous->isOneOf(tok::r_square, tok::r_brace)))) &&
(!Left.Previous || !Left.Previous->is(tok::period)))
return true;
if (Left.isOneOf(tok::kw_for, Keywords.kw_as) && Left.Previous &&
Left.Previous->is(tok::period) && Right.is(tok::l_paren))
return false;
if (Left.is(Keywords.kw_as) &&
Right.isOneOf(tok::l_square, tok::l_brace, tok::l_paren))
return true;
if (Left.is(tok::kw_default) && Left.Previous &&
Left.Previous->is(tok::kw_export))
return true;
if (Left.is(Keywords.kw_is) && Right.is(tok::l_brace))
return true;
if (Right.isOneOf(TT_JsTypeColon, TT_JsTypeOptionalQuestion))
return false;
if (Left.is(TT_JsTypeOperator) || Right.is(TT_JsTypeOperator))
return false;
if ((Left.is(tok::l_brace) || Right.is(tok::r_brace)) &&
Line.First->isOneOf(Keywords.kw_import, tok::kw_export))
return false;
if (Left.is(tok::ellipsis))
return false;
if (Left.is(TT_TemplateCloser) &&
!Right.isOneOf(tok::equal, tok::l_brace, tok::comma, tok::l_square,
Keywords.kw_implements, Keywords.kw_extends))
// Type assertions ('<type>expr') are not followed by whitespace. Other
// locations that should have whitespace following are identified by the
// above set of follower tokens.
return false;
if (Right.is(TT_NonNullAssertion))
return false;
if (Left.is(TT_NonNullAssertion) &&
Right.isOneOf(Keywords.kw_as, Keywords.kw_in))
return true; // "x! as string", "x! in y"
} else if (Style.Language == FormatStyle::LK_Java) {
if (Left.is(tok::r_square) && Right.is(tok::l_brace))
return true;
if (Left.is(Keywords.kw_synchronized) && Right.is(tok::l_paren))
return Style.SpaceBeforeParens != FormatStyle::SBPO_Never;
if ((Left.isOneOf(tok::kw_static, tok::kw_public, tok::kw_private,
tok::kw_protected) ||
Left.isOneOf(Keywords.kw_final, Keywords.kw_abstract,
Keywords.kw_native)) &&
Right.is(TT_TemplateOpener))
return true;
}
if (Left.is(TT_ImplicitStringLiteral))
return HasExistingWhitespace();
if (Line.Type == LT_ObjCMethodDecl) {
if (Left.is(TT_ObjCMethodSpecifier))
return true;
if (Left.is(tok::r_paren) && canBeObjCSelectorComponent(Right))
// Don't space between ')' and <id> or ')' and 'new'. 'new' is not a
// keyword in Objective-C, and '+ (instancetype)new;' is a standard class
// method declaration.
return false;
}
if (Line.Type == LT_ObjCProperty &&
(Right.is(tok::equal) || Left.is(tok::equal)))
return false;
if (Right.isOneOf(TT_TrailingReturnArrow, TT_LambdaArrow) ||
Left.isOneOf(TT_TrailingReturnArrow, TT_LambdaArrow))
return true;
if (Right.is(TT_OverloadedOperatorLParen))
return spaceRequiredBeforeParens(Right);
if (Left.is(tok::comma))
return true;
if (Right.is(tok::comma))
return false;
if (Right.is(TT_ObjCBlockLParen))
return true;
if (Right.is(TT_CtorInitializerColon))
return Style.SpaceBeforeCtorInitializerColon;
if (Right.is(TT_InheritanceColon) && !Style.SpaceBeforeInheritanceColon)
return false;
if (Right.is(TT_RangeBasedForLoopColon) &&
!Style.SpaceBeforeRangeBasedForLoopColon)
return false;
if (Left.is(TT_BitFieldColon))
return Style.BitFieldColonSpacing == FormatStyle::BFCS_Both ||
Style.BitFieldColonSpacing == FormatStyle::BFCS_After;
if (Right.is(tok::colon)) {
if (Line.First->isOneOf(tok::kw_default, tok::kw_case))
return Style.SpaceBeforeCaseColon;
if (!Right.getNextNonComment() || Right.getNextNonComment()->is(tok::semi))
return false;
if (Right.is(TT_ObjCMethodExpr))
return false;
if (Left.is(tok::question))
return false;
if (Right.is(TT_InlineASMColon) && Left.is(tok::coloncolon))
return false;
if (Right.is(TT_DictLiteral))
return Style.SpacesInContainerLiterals;
if (Right.is(TT_AttributeColon))
return false;
if (Right.is(TT_CSharpNamedArgumentColon))
return false;
if (Right.is(TT_BitFieldColon))
return Style.BitFieldColonSpacing == FormatStyle::BFCS_Both ||
Style.BitFieldColonSpacing == FormatStyle::BFCS_Before;
return true;
}
// Do not merge "- -" into "--".
if ((Left.isOneOf(tok::minus, tok::minusminus) &&
Right.isOneOf(tok::minus, tok::minusminus)) ||
(Left.isOneOf(tok::plus, tok::plusplus) &&
Right.isOneOf(tok::plus, tok::plusplus)))
return true;
if (Left.is(TT_UnaryOperator)) {
if (!Right.is(tok::l_paren)) {
// The alternative operators for ~ and ! are "compl" and "not".
// If they are used instead, we do not want to combine them with
// the token to the right, unless that is a left paren.
if (Left.is(tok::exclaim) && Left.TokenText == "not")
return true;
if (Left.is(tok::tilde) && Left.TokenText == "compl")
return true;
// Lambda captures allow for a lone &, so "&]" needs to be properly
// handled.
if (Left.is(tok::amp) && Right.is(tok::r_square))
return Style.SpacesInSquareBrackets;
}
return (Style.SpaceAfterLogicalNot && Left.is(tok::exclaim)) ||
Right.is(TT_BinaryOperator);
}
// If the next token is a binary operator or a selector name, we have
// incorrectly classified the parenthesis as a cast. FIXME: Detect correctly.
if (Left.is(TT_CastRParen))
return Style.SpaceAfterCStyleCast ||
Right.isOneOf(TT_BinaryOperator, TT_SelectorName);
auto ShouldAddSpacesInAngles = [this, &HasExistingWhitespace]() {
if (this->Style.SpacesInAngles == FormatStyle::SIAS_Always)
return true;
if (this->Style.SpacesInAngles == FormatStyle::SIAS_Leave)
return HasExistingWhitespace();
return false;
};
if (Left.is(tok::greater) && Right.is(tok::greater)) {
if (Style.Language == FormatStyle::LK_TextProto ||
(Style.Language == FormatStyle::LK_Proto && Left.is(TT_DictLiteral)))
return !Style.Cpp11BracedListStyle;
return Right.is(TT_TemplateCloser) && Left.is(TT_TemplateCloser) &&
((Style.Standard < FormatStyle::LS_Cpp11) ||
ShouldAddSpacesInAngles());
}
if (Right.isOneOf(tok::arrow, tok::arrowstar, tok::periodstar) ||
Left.isOneOf(tok::arrow, tok::period, tok::arrowstar, tok::periodstar) ||
(Right.is(tok::period) && Right.isNot(TT_DesignatedInitializerPeriod)))
return false;
if (!Style.SpaceBeforeAssignmentOperators && Left.isNot(TT_TemplateCloser) &&
Right.getPrecedence() == prec::Assignment)
return false;
if (Style.Language == FormatStyle::LK_Java && Right.is(tok::coloncolon) &&
(Left.is(tok::identifier) || Left.is(tok::kw_this)))
return false;
if (Right.is(tok::coloncolon) && Left.is(tok::identifier))
// Generally don't remove existing spaces between an identifier and "::".
// The identifier might actually be a macro name such as ALWAYS_INLINE. If
// this turns out to be too lenient, add analysis of the identifier itself.
return HasExistingWhitespace();
if (Right.is(tok::coloncolon) &&
!Left.isOneOf(tok::l_brace, tok::comment, tok::l_paren))
// Put a space between < and :: in vector< ::std::string >
return (Left.is(TT_TemplateOpener) &&
((Style.Standard < FormatStyle::LS_Cpp11) ||
ShouldAddSpacesInAngles())) ||
!(Left.isOneOf(tok::l_paren, tok::r_paren, tok::l_square,
tok::kw___super, TT_TemplateOpener,
TT_TemplateCloser)) ||
(Left.is(tok::l_paren) && Style.SpacesInParentheses);
if ((Left.is(TT_TemplateOpener)) != (Right.is(TT_TemplateCloser)))
return ShouldAddSpacesInAngles();
// Space before TT_StructuredBindingLSquare.
if (Right.is(TT_StructuredBindingLSquare))
return !Left.isOneOf(tok::amp, tok::ampamp) ||
Style.PointerAlignment != FormatStyle::PAS_Right;
// Space before & or && following a TT_StructuredBindingLSquare.
if (Right.Next && Right.Next->is(TT_StructuredBindingLSquare) &&
Right.isOneOf(tok::amp, tok::ampamp))
return Style.PointerAlignment != FormatStyle::PAS_Left;
if ((Right.is(TT_BinaryOperator) && !Left.is(tok::l_paren)) ||
(Left.isOneOf(TT_BinaryOperator, TT_ConditionalExpr) &&
!Right.is(tok::r_paren)))
return true;
if (Left.is(TT_TemplateCloser) && Right.is(tok::l_paren) &&
Right.isNot(TT_FunctionTypeLParen))
return spaceRequiredBeforeParens(Right);
if (Right.is(TT_TemplateOpener) && Left.is(tok::r_paren) &&
Left.MatchingParen && Left.MatchingParen->is(TT_OverloadedOperatorLParen))
return false;
if (Right.is(tok::less) && Left.isNot(tok::l_paren) &&
Line.startsWith(tok::hash))
return true;
if (Right.is(TT_TrailingUnaryOperator))
return false;
if (Left.is(TT_RegexLiteral))
return false;
return spaceRequiredBetween(Line, Left, Right);
}
// Returns 'true' if 'Tok' is a brace we'd want to break before in Allman style.
static bool isAllmanBrace(const FormatToken &Tok) {
return Tok.is(tok::l_brace) && Tok.is(BK_Block) &&
!Tok.isOneOf(TT_ObjCBlockLBrace, TT_LambdaLBrace, TT_DictLiteral);
}
// Returns 'true' if 'Tok' is an function argument.
static bool IsFunctionArgument(const FormatToken &Tok) {
return Tok.MatchingParen && Tok.MatchingParen->Next &&
Tok.MatchingParen->Next->isOneOf(tok::comma, tok::r_paren);
}
static bool
isItAnEmptyLambdaAllowed(const FormatToken &Tok,
FormatStyle::ShortLambdaStyle ShortLambdaOption) {
return Tok.Children.empty() && ShortLambdaOption != FormatStyle::SLS_None;
}
static bool
isItAInlineLambdaAllowed(const FormatToken &Tok,
FormatStyle::ShortLambdaStyle ShortLambdaOption) {
return (ShortLambdaOption == FormatStyle::SLS_Inline &&
IsFunctionArgument(Tok)) ||
(ShortLambdaOption == FormatStyle::SLS_All);
}
static bool isOneChildWithoutMustBreakBefore(const FormatToken &Tok) {
if (Tok.Children.size() != 1)
return false;
FormatToken *curElt = Tok.Children[0]->First;
while (curElt) {
if (curElt->MustBreakBefore)
return false;
curElt = curElt->Next;
}
return true;
}
static bool isAllmanLambdaBrace(const FormatToken &Tok) {
return (Tok.is(tok::l_brace) && Tok.is(BK_Block) &&
!Tok.isOneOf(TT_ObjCBlockLBrace, TT_DictLiteral));
}
static bool isAllmanBraceIncludedBreakableLambda(
const FormatToken &Tok, FormatStyle::ShortLambdaStyle ShortLambdaOption) {
if (!isAllmanLambdaBrace(Tok))
return false;
if (isItAnEmptyLambdaAllowed(Tok, ShortLambdaOption))
return false;
return !isItAInlineLambdaAllowed(Tok, ShortLambdaOption) ||
!isOneChildWithoutMustBreakBefore(Tok);
}
bool TokenAnnotator::mustBreakBefore(const AnnotatedLine &Line,
const FormatToken &Right) {
const FormatToken &Left = *Right.Previous;
if (Right.NewlinesBefore > 1 && Style.MaxEmptyLinesToKeep > 0)
return true;
if (Style.isCSharp()) {
if (Right.is(TT_CSharpNamedArgumentColon) ||
Left.is(TT_CSharpNamedArgumentColon))
return false;
if (Right.is(TT_CSharpGenericTypeConstraint))
return true;
} else if (Style.Language == FormatStyle::LK_JavaScript) {
// FIXME: This might apply to other languages and token kinds.
if (Right.is(tok::string_literal) && Left.is(tok::plus) && Left.Previous &&
Left.Previous->is(tok::string_literal))
return true;
if (Left.is(TT_DictLiteral) && Left.is(tok::l_brace) && Line.Level == 0 &&
Left.Previous && Left.Previous->is(tok::equal) &&
Line.First->isOneOf(tok::identifier, Keywords.kw_import, tok::kw_export,
tok::kw_const) &&
// kw_var/kw_let are pseudo-tokens that are tok::identifier, so match
// above.
!Line.First->isOneOf(Keywords.kw_var, Keywords.kw_let))
// Object literals on the top level of a file are treated as "enum-style".
// Each key/value pair is put on a separate line, instead of bin-packing.
return true;
if (Left.is(tok::l_brace) && Line.Level == 0 &&
(Line.startsWith(tok::kw_enum) ||
Line.startsWith(tok::kw_const, tok::kw_enum) ||
Line.startsWith(tok::kw_export, tok::kw_enum) ||
Line.startsWith(tok::kw_export, tok::kw_const, tok::kw_enum)))
// JavaScript top-level enum key/value pairs are put on separate lines
// instead of bin-packing.
return true;
if (Right.is(tok::r_brace) && Left.is(tok::l_brace) && Left.Previous &&
Left.Previous->is(TT_FatArrow)) {
// JS arrow function (=> {...}).
switch (Style.AllowShortLambdasOnASingleLine) {
case FormatStyle::SLS_All:
return false;
case FormatStyle::SLS_None:
return true;
case FormatStyle::SLS_Empty:
return !Left.Children.empty();
case FormatStyle::SLS_Inline:
// allow one-lining inline (e.g. in function call args) and empty arrow
// functions.
return (Left.NestingLevel == 0 && Line.Level == 0) &&
!Left.Children.empty();
}
llvm_unreachable("Unknown FormatStyle::ShortLambdaStyle enum");
}
if (Right.is(tok::r_brace) && Left.is(tok::l_brace) &&
!Left.Children.empty())
// Support AllowShortFunctionsOnASingleLine for JavaScript.
return Style.AllowShortFunctionsOnASingleLine == FormatStyle::SFS_None ||
Style.AllowShortFunctionsOnASingleLine == FormatStyle::SFS_Empty ||
(Left.NestingLevel == 0 && Line.Level == 0 &&
Style.AllowShortFunctionsOnASingleLine &
FormatStyle::SFS_InlineOnly);
} else if (Style.Language == FormatStyle::LK_Java) {
if (Right.is(tok::plus) && Left.is(tok::string_literal) && Right.Next &&
Right.Next->is(tok::string_literal))
return true;
} else if (Style.Language == FormatStyle::LK_Cpp ||
Style.Language == FormatStyle::LK_ObjC ||
Style.Language == FormatStyle::LK_Proto ||
Style.Language == FormatStyle::LK_TableGen ||
Style.Language == FormatStyle::LK_TextProto) {
if (Left.isStringLiteral() && Right.isStringLiteral())
return true;
}
// If the last token before a '}', ']', or ')' is a comma or a trailing
// comment, the intention is to insert a line break after it in order to make
// shuffling around entries easier. Import statements, especially in
// JavaScript, can be an exception to this rule.
if (Style.JavaScriptWrapImports || Line.Type != LT_ImportStatement) {
const FormatToken *BeforeClosingBrace = nullptr;
if ((Left.isOneOf(tok::l_brace, TT_ArrayInitializerLSquare) ||
(Style.Language == FormatStyle::LK_JavaScript &&
Left.is(tok::l_paren))) &&
Left.isNot(BK_Block) && Left.MatchingParen)
BeforeClosingBrace = Left.MatchingParen->Previous;
else if (Right.MatchingParen &&
(Right.MatchingParen->isOneOf(tok::l_brace,
TT_ArrayInitializerLSquare) ||
(Style.Language == FormatStyle::LK_JavaScript &&
Right.MatchingParen->is(tok::l_paren))))
BeforeClosingBrace = &Left;
if (BeforeClosingBrace && (BeforeClosingBrace->is(tok::comma) ||
BeforeClosingBrace->isTrailingComment()))
return true;
}
if (Right.is(tok::comment))
return Left.isNot(BK_BracedInit) && Left.isNot(TT_CtorInitializerColon) &&
(Right.NewlinesBefore > 0 && Right.HasUnescapedNewline);
if (Left.isTrailingComment())
return true;
if (Right.Previous->IsUnterminatedLiteral)
return true;
if (Right.is(tok::lessless) && Right.Next &&
Right.Previous->is(tok::string_literal) &&
Right.Next->is(tok::string_literal))
return true;
// Can break after template<> declaration
if (Right.Previous->ClosesTemplateDeclaration &&
Right.Previous->MatchingParen &&
Right.Previous->MatchingParen->NestingLevel == 0) {
// Put concepts on the next line e.g.
// template<typename T>
// concept ...
if (Right.is(tok::kw_concept))
return Style.BreakBeforeConceptDeclarations;
return (Style.AlwaysBreakTemplateDeclarations == FormatStyle::BTDS_Yes);
}
if (Right.is(TT_CtorInitializerComma) &&
Style.BreakConstructorInitializers == FormatStyle::BCIS_BeforeComma &&
!Style.ConstructorInitializerAllOnOneLineOrOnePerLine)
return true;
if (Right.is(TT_CtorInitializerColon) &&
Style.BreakConstructorInitializers == FormatStyle::BCIS_BeforeComma &&
!Style.ConstructorInitializerAllOnOneLineOrOnePerLine)
return true;
// Break only if we have multiple inheritance.
if (Style.BreakInheritanceList == FormatStyle::BILS_BeforeComma &&
Right.is(TT_InheritanceComma))
return true;
if (Right.is(tok::string_literal) && Right.TokenText.startswith("R\""))
// Multiline raw string literals are special wrt. line breaks. The author
// has made a deliberate choice and might have aligned the contents of the
// string literal accordingly. Thus, we try keep existing line breaks.
return Right.IsMultiline && Right.NewlinesBefore > 0;
if ((Right.Previous->is(tok::l_brace) ||
(Right.Previous->is(tok::less) && Right.Previous->Previous &&
Right.Previous->Previous->is(tok::equal))) &&
Right.NestingLevel == 1 && Style.Language == FormatStyle::LK_Proto) {
// Don't put enums or option definitions onto single lines in protocol
// buffers.
return true;
}
if (Right.is(TT_InlineASMBrace))
return Right.HasUnescapedNewline;
auto ShortLambdaOption = Style.AllowShortLambdasOnASingleLine;
if (Style.BraceWrapping.BeforeLambdaBody &&
(isAllmanBraceIncludedBreakableLambda(Left, ShortLambdaOption) ||
isAllmanBraceIncludedBreakableLambda(Right, ShortLambdaOption))) {
return true;
}
if (isAllmanBrace(Left) || isAllmanBrace(Right))
return (Line.startsWith(tok::kw_enum) && Style.BraceWrapping.AfterEnum) ||
(Line.startsWith(tok::kw_typedef, tok::kw_enum) &&
Style.BraceWrapping.AfterEnum) ||
(Line.startsWith(tok::kw_class) && Style.BraceWrapping.AfterClass) ||
(Line.startsWith(tok::kw_struct) && Style.BraceWrapping.AfterStruct);
if (Left.is(TT_ObjCBlockLBrace) &&
Style.AllowShortBlocksOnASingleLine == FormatStyle::SBS_Never)
return true;
if (Left.is(TT_LambdaLBrace)) {
if (IsFunctionArgument(Left) &&
Style.AllowShortLambdasOnASingleLine == FormatStyle::SLS_Inline)
return false;
if (Style.AllowShortLambdasOnASingleLine == FormatStyle::SLS_None ||
Style.AllowShortLambdasOnASingleLine == FormatStyle::SLS_Inline ||
(!Left.Children.empty() &&
Style.AllowShortLambdasOnASingleLine == FormatStyle::SLS_Empty))
return true;
}
// Put multiple Java annotation on a new line.
if ((Style.Language == FormatStyle::LK_Java ||
Style.Language == FormatStyle::LK_JavaScript) &&
Left.is(TT_LeadingJavaAnnotation) &&
Right.isNot(TT_LeadingJavaAnnotation) && Right.isNot(tok::l_paren) &&
(Line.Last->is(tok::l_brace) || Style.BreakAfterJavaFieldAnnotations))
return true;
if (Right.is(TT_ProtoExtensionLSquare))
return true;
// In text proto instances if a submessage contains at least 2 entries and at
// least one of them is a submessage, like A { ... B { ... } ... },
// put all of the entries of A on separate lines by forcing the selector of
// the submessage B to be put on a newline.
//
// Example: these can stay on one line:
// a { scalar_1: 1 scalar_2: 2 }
// a { b { key: value } }
//
// and these entries need to be on a new line even if putting them all in one
// line is under the column limit:
// a {
// scalar: 1
// b { key: value }
// }
//
// We enforce this by breaking before a submessage field that has previous
// siblings, *and* breaking before a field that follows a submessage field.
//
// Be careful to exclude the case [proto.ext] { ... } since the `]` is
// the TT_SelectorName there, but we don't want to break inside the brackets.
//
// Another edge case is @submessage { key: value }, which is a common
// substitution placeholder. In this case we want to keep `@` and `submessage`
// together.
//
// We ensure elsewhere that extensions are always on their own line.
if ((Style.Language == FormatStyle::LK_Proto ||
Style.Language == FormatStyle::LK_TextProto) &&
Right.is(TT_SelectorName) && !Right.is(tok::r_square) && Right.Next) {
// Keep `@submessage` together in:
// @submessage { key: value }
if (Right.Previous && Right.Previous->is(tok::at))
return false;
// Look for the scope opener after selector in cases like:
// selector { ...
// selector: { ...
// selector: @base { ...
FormatToken *LBrace = Right.Next;
if (LBrace && LBrace->is(tok::colon)) {
LBrace = LBrace->Next;
if (LBrace && LBrace->is(tok::at)) {
LBrace = LBrace->Next;
if (LBrace)
LBrace = LBrace->Next;
}
}
if (LBrace &&
// The scope opener is one of {, [, <:
// selector { ... }
// selector [ ... ]
// selector < ... >
//
// In case of selector { ... }, the l_brace is TT_DictLiteral.
// In case of an empty selector {}, the l_brace is not TT_DictLiteral,
// so we check for immediately following r_brace.
((LBrace->is(tok::l_brace) &&
(LBrace->is(TT_DictLiteral) ||
(LBrace->Next && LBrace->Next->is(tok::r_brace)))) ||
LBrace->is(TT_ArrayInitializerLSquare) || LBrace->is(tok::less))) {
// If Left.ParameterCount is 0, then this submessage entry is not the
// first in its parent submessage, and we want to break before this entry.
// If Left.ParameterCount is greater than 0, then its parent submessage
// might contain 1 or more entries and we want to break before this entry
// if it contains at least 2 entries. We deal with this case later by
// detecting and breaking before the next entry in the parent submessage.
if (Left.ParameterCount == 0)
return true;
// However, if this submessage is the first entry in its parent
// submessage, Left.ParameterCount might be 1 in some cases.
// We deal with this case later by detecting an entry
// following a closing paren of this submessage.
}
// If this is an entry immediately following a submessage, it will be
// preceded by a closing paren of that submessage, like in:
// left---. .---right
// v v
// sub: { ... } key: value
// If there was a comment between `}` an `key` above, then `key` would be
// put on a new line anyways.
if (Left.isOneOf(tok::r_brace, tok::greater, tok::r_square))
return true;
}
// Deal with lambda arguments in C++ - we want consistent line breaks whether
// they happen to be at arg0, arg1 or argN. The selection is a bit nuanced
// as aggressive line breaks are placed when the lambda is not the last arg.
if ((Style.Language == FormatStyle::LK_Cpp ||
Style.Language == FormatStyle::LK_ObjC) &&
Left.is(tok::l_paren) && Left.BlockParameterCount > 0 &&
!Right.isOneOf(tok::l_paren, TT_LambdaLSquare)) {
// Multiple lambdas in the same function call force line breaks.
if (Left.BlockParameterCount > 1)
return true;
// A lambda followed by another arg forces a line break.
if (!Left.Role)
return false;
auto Comma = Left.Role->lastComma();
if (!Comma)
return false;
auto Next = Comma->getNextNonComment();
if (!Next)
return false;
if (!Next->isOneOf(TT_LambdaLSquare, tok::l_brace, tok::caret))
return true;
}
return false;
}
bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
const FormatToken &Right) {
const FormatToken &Left = *Right.Previous;
// Language-specific stuff.
if (Style.isCSharp()) {
if (Left.isOneOf(TT_CSharpNamedArgumentColon, TT_AttributeColon) ||
Right.isOneOf(TT_CSharpNamedArgumentColon, TT_AttributeColon))
return false;
// Only break after commas for generic type constraints.
if (Line.First->is(TT_CSharpGenericTypeConstraint))
return Left.is(TT_CSharpGenericTypeConstraintComma);
// Keep nullable operators attached to their identifiers.
if (Right.is(TT_CSharpNullable)) {
return false;
}
} else if (Style.Language == FormatStyle::LK_Java) {
if (Left.isOneOf(Keywords.kw_throws, Keywords.kw_extends,
Keywords.kw_implements))
return false;
if (Right.isOneOf(Keywords.kw_throws, Keywords.kw_extends,
Keywords.kw_implements))
return true;
} else if (Style.Language == FormatStyle::LK_JavaScript) {
const FormatToken *NonComment = Right.getPreviousNonComment();
if (NonComment &&
NonComment->isOneOf(
tok::kw_return, Keywords.kw_yield, tok::kw_continue, tok::kw_break,
tok::kw_throw, Keywords.kw_interface, Keywords.kw_type,
tok::kw_static, tok::kw_public, tok::kw_private, tok::kw_protected,
Keywords.kw_readonly, Keywords.kw_abstract, Keywords.kw_get,
Keywords.kw_set, Keywords.kw_async, Keywords.kw_await))
return false; // Otherwise automatic semicolon insertion would trigger.
if (Right.NestingLevel == 0 &&
(Left.Tok.getIdentifierInfo() ||
Left.isOneOf(tok::r_square, tok::r_paren)) &&
Right.isOneOf(tok::l_square, tok::l_paren))
return false; // Otherwise automatic semicolon insertion would trigger.
if (NonComment && NonComment->is(tok::identifier) &&
NonComment->TokenText == "asserts")
return false;
if (Left.is(TT_FatArrow) && Right.is(tok::l_brace))
return false;
if (Left.is(TT_JsTypeColon))
return true;
// Don't wrap between ":" and "!" of a strict prop init ("field!: type;").
if (Left.is(tok::exclaim) && Right.is(tok::colon))
return false;
// Look for is type annotations like:
// function f(): a is B { ... }
// Do not break before is in these cases.
if (Right.is(Keywords.kw_is)) {
const FormatToken *Next = Right.getNextNonComment();
// If `is` is followed by a colon, it's likely that it's a dict key, so
// ignore it for this check.
// For example this is common in Polymer:
// Polymer({
// is: 'name',
// ...
// });
if (!Next || !Next->is(tok::colon))
return false;
}
if (Left.is(Keywords.kw_in))
return Style.BreakBeforeBinaryOperators == FormatStyle::BOS_None;
if (Right.is(Keywords.kw_in))
return Style.BreakBeforeBinaryOperators != FormatStyle::BOS_None;
if (Right.is(Keywords.kw_as))
return false; // must not break before as in 'x as type' casts
if (Right.isOneOf(Keywords.kw_extends, Keywords.kw_infer)) {
// extends and infer can appear as keywords in conditional types:
// https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-8.html#conditional-types
// do not break before them, as the expressions are subject to ASI.
return false;
}
if (Left.is(Keywords.kw_as))
return true;
if (Left.is(TT_NonNullAssertion))
return true;
if (Left.is(Keywords.kw_declare) &&
Right.isOneOf(Keywords.kw_module, tok::kw_namespace,
Keywords.kw_function, tok::kw_class, tok::kw_enum,
Keywords.kw_interface, Keywords.kw_type, Keywords.kw_var,
Keywords.kw_let, tok::kw_const))
// See grammar for 'declare' statements at:
// https://github.com/Microsoft/TypeScript/blob/master/doc/spec.md#A.10
return false;
if (Left.isOneOf(Keywords.kw_module, tok::kw_namespace) &&
Right.isOneOf(tok::identifier, tok::string_literal))
return false; // must not break in "module foo { ...}"
if (Right.is(TT_TemplateString) && Right.closesScope())
return false;
// Don't split tagged template literal so there is a break between the tag
// identifier and template string.
if (Left.is(tok::identifier) && Right.is(TT_TemplateString)) {
return false;
}
if (Left.is(TT_TemplateString) && Left.opensScope())
return true;
}
if (Left.is(tok::at))
return false;
if (Left.Tok.getObjCKeywordID() == tok::objc_interface)
return false;
if (Left.isOneOf(TT_JavaAnnotation, TT_LeadingJavaAnnotation))
return !Right.is(tok::l_paren);
if (Right.is(TT_PointerOrReference))
return Line.IsMultiVariableDeclStmt ||
(Style.PointerAlignment == FormatStyle::PAS_Right &&
(!Right.Next || Right.Next->isNot(TT_FunctionDeclarationName)));
if (Right.isOneOf(TT_StartOfName, TT_FunctionDeclarationName) ||
Right.is(tok::kw_operator))
return true;
if (Left.is(TT_PointerOrReference))
return false;
if (Right.isTrailingComment())
// We rely on MustBreakBefore being set correctly here as we should not
// change the "binding" behavior of a comment.
// The first comment in a braced lists is always interpreted as belonging to
// the first list element. Otherwise, it should be placed outside of the
// list.
return Left.is(BK_BracedInit) ||
(Left.is(TT_CtorInitializerColon) &&
Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon);
if (Left.is(tok::question) && Right.is(tok::colon))
return false;
if (Right.is(TT_ConditionalExpr) || Right.is(tok::question))
return Style.BreakBeforeTernaryOperators;
if (Left.is(TT_ConditionalExpr) || Left.is(tok::question))
return !Style.BreakBeforeTernaryOperators;
if (Left.is(TT_InheritanceColon))
return Style.BreakInheritanceList == FormatStyle::BILS_AfterColon;
if (Right.is(TT_InheritanceColon))
return Style.BreakInheritanceList != FormatStyle::BILS_AfterColon;
if (Right.is(TT_ObjCMethodExpr) && !Right.is(tok::r_square) &&
Left.isNot(TT_SelectorName))
return true;
if (Right.is(tok::colon) &&
!Right.isOneOf(TT_CtorInitializerColon, TT_InlineASMColon))
return false;
if (Left.is(tok::colon) && Left.isOneOf(TT_DictLiteral, TT_ObjCMethodExpr)) {
if (Style.Language == FormatStyle::LK_Proto ||
Style.Language == FormatStyle::LK_TextProto) {
if (!Style.AlwaysBreakBeforeMultilineStrings && Right.isStringLiteral())
return false;
// Prevent cases like:
//
// submessage:
// { key: valueeeeeeeeeeee }
//
// when the snippet does not fit into one line.
// Prefer:
//
// submessage: {
// key: valueeeeeeeeeeee
// }
//
// instead, even if it is longer by one line.
//
// Note that this allows allows the "{" to go over the column limit
// when the column limit is just between ":" and "{", but that does
// not happen too often and alternative formattings in this case are
// not much better.
//
// The code covers the cases:
//
// submessage: { ... }
// submessage: < ... >
// repeated: [ ... ]
if (((Right.is(tok::l_brace) || Right.is(tok::less)) &&
Right.is(TT_DictLiteral)) ||
Right.is(TT_ArrayInitializerLSquare))
return false;
}
return true;
}
if (Right.is(tok::r_square) && Right.MatchingParen &&
Right.MatchingParen->is(TT_ProtoExtensionLSquare))
return false;
if (Right.is(TT_SelectorName) || (Right.is(tok::identifier) && Right.Next &&
Right.Next->is(TT_ObjCMethodExpr)))
return Left.isNot(tok::period); // FIXME: Properly parse ObjC calls.
if (Left.is(tok::r_paren) && Line.Type == LT_ObjCProperty)
return true;
if (Left.ClosesTemplateDeclaration || Left.is(TT_FunctionAnnotationRParen))
return true;
if (Right.isOneOf(TT_RangeBasedForLoopColon, TT_OverloadedOperatorLParen,
TT_OverloadedOperator))
return false;
if (Left.is(TT_RangeBasedForLoopColon))
return true;
if (Right.is(TT_RangeBasedForLoopColon))
return false;
if (Left.is(TT_TemplateCloser) && Right.is(TT_TemplateOpener))
return true;
if (Left.isOneOf(TT_TemplateCloser, TT_UnaryOperator) ||
Left.is(tok::kw_operator))
return false;
if (Left.is(tok::equal) && !Right.isOneOf(tok::kw_default, tok::kw_delete) &&
Line.Type == LT_VirtualFunctionDecl && Left.NestingLevel == 0)
return false;
if (Left.is(tok::equal) && Right.is(tok::l_brace) &&
!Style.Cpp11BracedListStyle)
return false;
if (Left.is(tok::l_paren) &&
Left.isOneOf(TT_AttributeParen, TT_TypeDeclarationParen))
return false;
if (Left.is(tok::l_paren) && Left.Previous &&
(Left.Previous->isOneOf(TT_BinaryOperator, TT_CastRParen)))
return false;
if (Right.is(TT_ImplicitStringLiteral))
return false;
if (Right.is(tok::r_paren) || Right.is(TT_TemplateCloser))
return false;
if (Right.is(tok::r_square) && Right.MatchingParen &&
Right.MatchingParen->is(TT_LambdaLSquare))
return false;
// We only break before r_brace if there was a corresponding break before
// the l_brace, which is tracked by BreakBeforeClosingBrace.
if (Right.is(tok::r_brace))
return Right.MatchingParen && Right.MatchingParen->is(BK_Block);
// Allow breaking after a trailing annotation, e.g. after a method
// declaration.
if (Left.is(TT_TrailingAnnotation))
return !Right.isOneOf(tok::l_brace, tok::semi, tok::equal, tok::l_paren,
tok::less, tok::coloncolon);
if (Right.is(tok::kw___attribute) ||
(Right.is(tok::l_square) && Right.is(TT_AttributeSquare)))
return !Left.is(TT_AttributeSquare);
if (Left.is(tok::identifier) && Right.is(tok::string_literal))
return true;
if (Right.is(tok::identifier) && Right.Next && Right.Next->is(TT_DictLiteral))
return true;
if (Left.is(TT_CtorInitializerColon))
return Style.BreakConstructorInitializers == FormatStyle::BCIS_AfterColon;
if (Right.is(TT_CtorInitializerColon))
return Style.BreakConstructorInitializers != FormatStyle::BCIS_AfterColon;
if (Left.is(TT_CtorInitializerComma) &&
Style.BreakConstructorInitializers == FormatStyle::BCIS_BeforeComma)
return false;
if (Right.is(TT_CtorInitializerComma) &&
Style.BreakConstructorInitializers == FormatStyle::BCIS_BeforeComma)
return true;
if (Left.is(TT_InheritanceComma) &&
Style.BreakInheritanceList == FormatStyle::BILS_BeforeComma)
return false;
if (Right.is(TT_InheritanceComma) &&
Style.BreakInheritanceList == FormatStyle::BILS_BeforeComma)
return true;
if ((Left.is(tok::greater) && Right.is(tok::greater)) ||
(Left.is(tok::less) && Right.is(tok::less)))
return false;
if (Right.is(TT_BinaryOperator) &&
Style.BreakBeforeBinaryOperators != FormatStyle::BOS_None &&
(Style.BreakBeforeBinaryOperators == FormatStyle::BOS_All ||
Right.getPrecedence() != prec::Assignment))
return true;
if (Left.is(TT_ArrayInitializerLSquare))
return true;
if (Right.is(tok::kw_typename) && Left.isNot(tok::kw_const))
return true;
if ((Left.isBinaryOperator() || Left.is(TT_BinaryOperator)) &&
!Left.isOneOf(tok::arrowstar, tok::lessless) &&
Style.BreakBeforeBinaryOperators != FormatStyle::BOS_All &&
(Style.BreakBeforeBinaryOperators == FormatStyle::BOS_None ||
Left.getPrecedence() == prec::Assignment))
return true;
if ((Left.is(TT_AttributeSquare) && Right.is(tok::l_square)) ||
(Left.is(tok::r_square) && Right.is(TT_AttributeSquare)))
return false;
auto ShortLambdaOption = Style.AllowShortLambdasOnASingleLine;
if (Style.BraceWrapping.BeforeLambdaBody) {
if (isAllmanLambdaBrace(Left))
return !isItAnEmptyLambdaAllowed(Left, ShortLambdaOption);
if (isAllmanLambdaBrace(Right))
return !isItAnEmptyLambdaAllowed(Right, ShortLambdaOption);
}
return Left.isOneOf(tok::comma, tok::coloncolon, tok::semi, tok::l_brace,
tok::kw_class, tok::kw_struct, tok::comment) ||
Right.isMemberAccess() ||
Right.isOneOf(TT_TrailingReturnArrow, TT_LambdaArrow, tok::lessless,
tok::colon, tok::l_square, tok::at) ||
(Style.BraceWrapping.BeforeLambdaBody && Right.is(TT_LambdaLBrace)) ||
(Left.is(tok::r_paren) &&
Right.isOneOf(tok::identifier, tok::kw_const)) ||
(Left.is(tok::l_paren) && !Right.is(tok::r_paren)) ||
(Left.is(TT_TemplateOpener) && !Right.is(TT_TemplateCloser));
}
void TokenAnnotator::printDebugInfo(const AnnotatedLine &Line) {
llvm::errs() << "AnnotatedTokens(L=" << Line.Level << "):\n";
const FormatToken *Tok = Line.First;
while (Tok) {
llvm::errs() << " M=" << Tok->MustBreakBefore
<< " C=" << Tok->CanBreakBefore
<< " T=" << getTokenTypeName(Tok->getType())
<< " S=" << Tok->SpacesRequiredBefore
<< " F=" << Tok->Finalized << " B=" << Tok->BlockParameterCount
<< " BK=" << Tok->getBlockKind() << " P=" << Tok->SplitPenalty
<< " Name=" << Tok->Tok.getName() << " L=" << Tok->TotalLength
<< " PPK=" << Tok->getPackingKind() << " FakeLParens=";
for (unsigned i = 0, e = Tok->FakeLParens.size(); i != e; ++i)
llvm::errs() << Tok->FakeLParens[i] << "/";
llvm::errs() << " FakeRParens=" << Tok->FakeRParens;
llvm::errs() << " II=" << Tok->Tok.getIdentifierInfo();
llvm::errs() << " Text='" << Tok->TokenText << "'\n";
if (!Tok->Next)
assert(Tok == Line.Last);
Tok = Tok->Next;
}
llvm::errs() << "----\n";
}
} // namespace format
} // namespace clang
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