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TokenAnnotator.cpp
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TokenAnnotator.cpp
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//===--- TokenAnnotator.cpp - Format C++ code -----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief This file implements a token annotator, i.e. creates
/// \c AnnotatedTokens out of \c FormatTokens with required extra information.
///
//===----------------------------------------------------------------------===//
#include "TokenAnnotator.h"
#include "clang/Basic/SourceManager.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "format-token-annotator"
namespace clang {
namespace format {
namespace {
/// \brief 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)) {
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->Type = TT_DictLiteral;
else
CurrentToken->Type = 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.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->Type = TT_SelectorName;
}
}
if (!consumeToken())
return false;
}
return false;
}
bool parseParens(bool LookForDecls = false) {
if (!CurrentToken)
return false;
FormatToken *Left = CurrentToken->Previous;
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;
bool StartsObjCMethodExpr = false;
if (CurrentToken->is(tok::caret)) {
// (^ can start a block type.
Left->Type = TT_ObjCBlockLParen;
} else 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_decltype,
tok::kw_if, tok::kw_while, tok::l_paren,
tok::comma) ||
Left->Previous->endsSequence(tok::kw_constexpr, tok::kw_if) ||
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 (Left->Previous && Left->Previous->is(tok::r_square) &&
Left->Previous->MatchingParen &&
Left->Previous->MatchingParen->is(TT_LambdaLSquare)) {
// 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(tok::kw___attribute)) {
Left->Type = TT_AttributeParen;
} 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;
}
if (StartsObjCMethodExpr) {
Contexts.back().ColonIsObjCMethodExpr = true;
Left->Type = TT_ObjCMethodExpr;
}
bool MightBeFunctionType = !Contexts[Contexts.size() - 2].IsExpression;
bool ProbablyFunctionType = CurrentToken->isOneOf(tok::star, tok::amp);
bool HasMultipleLines = false;
bool HasMultipleParametersOnALine = false;
bool MightBeObjCForRangeLoop =
Left->Previous && Left->Previous->is(tok::kw_for);
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->Type = 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->Type = 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->Type = TT_PointerOrReference;
}
}
if (StartsObjCMethodExpr) {
CurrentToken->Type = TT_ObjCMethodExpr;
if (Contexts.back().FirstObjCSelectorName) {
Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
Contexts.back().LongestObjCSelectorName;
}
}
if (Left->is(TT_AttributeParen))
CurrentToken->Type = TT_AttributeParen;
if (Left->Previous && Left->Previous->is(TT_JavaAnnotation))
CurrentToken->Type = TT_JavaAnnotation;
if (Left->Previous && Left->Previous->is(TT_LeadingJavaAnnotation))
CurrentToken->Type = TT_LeadingJavaAnnotation;
if (!HasMultipleLines)
Left->PackingKind = PPK_Inconclusive;
else if (HasMultipleParametersOnALine)
Left->PackingKind = PPK_BinPacked;
else
Left->PackingKind = PPK_OnePerLine;
next();
return true;
}
if (CurrentToken->isOneOf(tok::r_square, tok::r_brace))
return false;
if (CurrentToken->is(tok::l_brace))
Left->Type = 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 (MightBeObjCForRangeLoop && CurrentToken->is(Keywords.kw_in))
CurrentToken->Type = 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 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, or it could the start of an Objective-C array literal.
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 StartsObjCMethodExpr =
!CppArrayTemplates && Style.isCpp() &&
Contexts.back().CanBeExpression && Left->isNot(TT_LambdaLSquare) &&
CurrentToken->isNot(tok::l_brace) &&
(!Parent ||
Parent->isOneOf(tok::colon, tok::l_square, tok::l_paren,
tok::kw_return, tok::kw_throw) ||
Parent->isUnaryOperator() ||
Parent->isOneOf(TT_ObjCForIn, TT_CastRParen) ||
getBinOpPrecedence(Parent->Tok.getKind(), true, true) > prec::Unknown);
bool ColonFound = false;
unsigned BindingIncrease = 1;
if (Left->isCppStructuredBinding(Style)) {
Left->Type = TT_StructuredBindingLSquare;
} else if (Left->is(TT_Unknown)) {
if (StartsObjCMethodExpr) {
Left->Type = TT_ObjCMethodExpr;
} else if (Style.Language == FormatStyle::LK_JavaScript && Parent &&
Contexts.back().ContextKind == tok::l_brace &&
Parent->isOneOf(tok::l_brace, tok::comma)) {
Left->Type = TT_JsComputedPropertyName;
} else if (Style.isCpp() && Contexts.back().ContextKind == tok::l_brace &&
Parent && Parent->isOneOf(tok::l_brace, tok::comma)) {
Left->Type = TT_DesignatedInitializerLSquare;
} else if (CurrentToken->is(tok::r_square) && Parent &&
Parent->is(TT_TemplateCloser)) {
Left->Type = 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
// ];
//
// or text proto extensions (in options):
//
// option (Aaa.options) = {
// [type.type/type] {
// key: value
// }
// }
//
// In the first case we want to spread the contents inside the square
// braces; in the second we want to keep them inline.
Left->Type = TT_ArrayInitializerLSquare;
if (!Left->endsSequence(tok::l_square, tok::numeric_constant,
tok::equal)) {
Left->Type = 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->Type = TT_ArrayInitializerLSquare;
} else {
BindingIncrease = 10;
Left->Type = 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;
while (CurrentToken) {
if (CurrentToken->is(tok::r_square)) {
if (CurrentToken->Next && CurrentToken->Next->is(tok::l_paren) &&
Left->is(TT_ObjCMethodExpr)) {
// An ObjC method call is rarely followed by an open parenthesis.
// FIXME: Do we incorrectly label ":" with this?
StartsObjCMethodExpr = false;
Left->Type = TT_Unknown;
}
if (StartsObjCMethodExpr && CurrentToken->Previous != Left) {
CurrentToken->Type = TT_ObjCMethodExpr;
// 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->Type = TT_BinaryOperator;
}
Left->MatchingParen = CurrentToken;
CurrentToken->MatchingParen = Left;
if (Contexts.back().FirstObjCSelectorName) {
Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
Contexts.back().LongestObjCSelectorName;
Contexts.back().FirstObjCSelectorName->ObjCSelectorNameParts =
Left->ParameterCount;
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 (Left->isOneOf(TT_ArraySubscriptLSquare,
TT_DesignatedInitializerLSquare)) {
Left->Type = TT_ObjCMethodExpr;
StartsObjCMethodExpr = true;
// ParameterCount might have been set to 1 before expression was
// recognized as ObjCMethodExpr (as '1 + number of commas' formula is
// used for other expression types). Parameter counter has to be,
// therefore, reset to 0.
Left->ParameterCount = 0;
Contexts.back().ColonIsObjCMethodExpr = true;
if (Parent && Parent->is(tok::r_paren))
Parent->Type = TT_CastRParen;
}
ColonFound = true;
}
if (CurrentToken->is(tok::comma) && Left->is(TT_ObjCMethodExpr) &&
!ColonFound)
Left->Type = 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->Type = TT_ObjCBlockLBrace;
Contexts.back().CaretFound = false;
ScopedContextCreator ContextCreator(*this, tok::l_brace, 1);
Contexts.back().ColonIsDictLiteral = true;
if (Left->BlockKind == 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->Type = TT_DictLiteral;
if (Previous->Tok.getIdentifierInfo() ||
Previous->is(tok::string_literal))
Previous->Type = TT_SelectorName;
}
if (CurrentToken->is(tok::colon) ||
Style.Language == FormatStyle::LK_JavaScript)
Left->Type = TT_DictLiteral;
}
if (CurrentToken->is(tok::comma) &&
Style.Language == FormatStyle::LK_JavaScript)
Left->Type = TT_DictLiteral;
if (!consumeToken())
return false;
}
}
return true;
}
void updateParameterCount(FormatToken *Left, FormatToken *Current) {
if (Current->is(tok::l_brace) && Current->BlockKind == BK_Block)
++Left->BlockParameterCount;
if (Left->Type == TT_ObjCMethodExpr) {
if (Current->is(tok::colon))
++Left->ParameterCount;
} else 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->Type = TT_ConditionalExpr;
next();
return true;
}
if (!consumeToken())
return false;
}
return false;
}
bool parseTemplateDeclaration() {
if (CurrentToken && CurrentToken->is(tok::less)) {
CurrentToken->Type = 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->Type = 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->Type = TT_JsTypeColon;
break;
}
}
if (Contexts.back().ColonIsDictLiteral ||
Style.Language == FormatStyle::LK_Proto ||
Style.Language == FormatStyle::LK_TextProto) {
Tok->Type = TT_DictLiteral;
if (Style.Language == FormatStyle::LK_TextProto) {
if (FormatToken *Previous = Tok->getPreviousNonComment())
Previous->Type = TT_SelectorName;
}
} else if (Contexts.back().ColonIsObjCMethodExpr ||
Line.startsWith(TT_ObjCMethodSpecifier)) {
Tok->Type = TT_ObjCMethodExpr;
const FormatToken *BeforePrevious = Tok->Previous->Previous;
if (!BeforePrevious ||
!(BeforePrevious->is(TT_CastRParen) ||
(BeforePrevious->is(TT_ObjCMethodExpr) &&
BeforePrevious->is(tok::colon))) ||
BeforePrevious->is(tok::r_square) ||
Contexts.back().LongestObjCSelectorName == 0) {
Tok->Previous->Type = 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;
}
} else if (Contexts.back().ColonIsForRangeExpr) {
Tok->Type = TT_RangeBasedForLoopColon;
} else if (CurrentToken && CurrentToken->is(tok::numeric_constant)) {
Tok->Type = TT_BitFieldColon;
} else if (Contexts.size() == 1 &&
!Line.First->isOneOf(tok::kw_enum, tok::kw_case)) {
if (Tok->getPreviousNonComment()->isOneOf(tok::r_paren,
tok::kw_noexcept))
Tok->Type = TT_CtorInitializerColon;
else
Tok->Type = TT_InheritanceColon;
} else if (Tok->Previous->is(tok::identifier) && Tok->Next &&
Tok->Next->isOneOf(tok::r_paren, tok::comma)) {
// This handles a special macro in ObjC code where selectors including
// the colon are passed as macro arguments.
Tok->Type = TT_ObjCMethodExpr;
} else if (Contexts.back().ContextKind == tok::l_paren) {
Tok->Type = 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->Type = TT_JsTypeOperator;
break;
case tok::kw_if:
case tok::kw_while:
if (Tok->is(tok::kw_if) && CurrentToken &&
CurrentToken->is(tok::kw_constexpr))
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->Type = TT_OverloadedOperator;
Tok->Previous->MatchingParen->Type = TT_OverloadedOperator;
Tok->Type = TT_OverloadedOperatorLParen;
}
if (!parseParens())
return false;
if (Line.MustBeDeclaration && Contexts.size() == 1 &&
!Contexts.back().IsExpression && !Line.startsWith(TT_ObjCProperty) &&
(!Tok->Previous ||
!Tok->Previous->isOneOf(tok::kw_decltype, 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->Type != TT_DictLiteral)
Previous->Type = TT_SelectorName;
}
if (!parseBrace())
return false;
break;
case tok::less:
if (parseAngle()) {
Tok->Type = 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->Type = TT_DictLiteral;
FormatToken *Previous = Tok->getPreviousNonComment();
if (Previous && Previous->Type != TT_DictLiteral)
Previous->Type = TT_SelectorName;
}
} else {
Tok->Type = 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->Type = TT_BinaryOperator;
break;
case tok::kw_operator:
while (CurrentToken &&
!CurrentToken->isOneOf(tok::l_paren, tok::semi, tok::r_paren)) {
if (CurrentToken->isOneOf(tok::star, tok::amp))
CurrentToken->Type = TT_PointerOrReference;
consumeToken();
if (CurrentToken &&
CurrentToken->Previous->isOneOf(TT_BinaryOperator, TT_UnaryOperator,
tok::comma))
CurrentToken->Previous->Type = TT_OverloadedOperator;
}
if (CurrentToken) {
CurrentToken->Type = TT_OverloadedOperatorLParen;
if (CurrentToken->Previous->is(TT_BinaryOperator))
CurrentToken->Previous->Type = 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->Type = 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;
parseConditional();
break;
case tok::kw_template:
parseTemplateDeclaration();
break;
case tok::comma:
if (Contexts.back().InCtorInitializer)
Tok->Type = TT_CtorInitializerComma;
else if (Contexts.back().InInheritanceList)
Tok->Type = 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();
}
break;
default:
break;
}
return true;
}
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->Type = 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->Type = 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->Type = 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->Type = 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;
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() {
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 are very similar to import statements
// and should not be line-wrapped.
if (Style.Language == FormatStyle::LK_Proto && Line.Level == 0 &&
CurrentToken->is(Keywords.kw_option)) {
next();
if (CurrentToken && CurrentToken->is(tok::identifier))
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;
}