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fuchsia / third_party / swift-clang / refs/tags/swift-DEVELOPMENT-SNAPSHOT-2016-08-24-a / . / lib / Format / TokenAnnotator.cpp
blob: e3528b8a5f9d1aa0dff06cb5ff38ae643b578e70 [file] [log] [blame]
//===--- 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;
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;
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))
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 (!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 (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->is(TT_BinaryOperator))) {
// static_assert, if and while usually contain expressions.
Contexts.back().IsExpression = true;
} 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 = CurrentToken->isOneOf(tok::star, tok::amp) &&
!Contexts[Contexts.size() - 2].IsExpression;
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))
MightBeFunctionType = true;
if (CurrentToken->Previous->is(TT_BinaryOperator))
Contexts.back().IsExpression = true;
if (CurrentToken->is(tok::r_paren)) {
if (MightBeFunctionType && 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->isOneOf(tok::kw_const, tok::kw_auto) ||
CurrentToken->isSimpleTypeSpecifier())
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();
bool StartsObjCMethodExpr =
Style.Language == FormatStyle::LK_Cpp &&
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->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.Language == FormatStyle::LK_Proto ||
(Parent &&
Parent->isOneOf(TT_BinaryOperator, 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;
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;
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->is(TT_ArraySubscriptLSquare)) {
Left->Type = TT_ObjCMethodExpr;
StartsObjCMethodExpr = true;
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;
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)) {
FormatToken *Previous = CurrentToken->getPreviousNonComment();
if (((CurrentToken->is(tok::colon) &&
(!Contexts.back().ColonIsDictLiteral ||
Style.Language != FormatStyle::LK_Cpp)) ||
Style.Language == FormatStyle::LK_Proto) &&
Previous->Tok.getIdentifierInfo())
Previous->Type = TT_SelectorName;
if (CurrentToken->is(tok::colon) ||
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->is(TT_DictLiteral))
++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->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.size() == 1 &&
Line.MustBeDeclaration)) { // method/property declaration
Tok->Type = TT_JsTypeColon;
break;
}
}
if (Contexts.back().ColonIsDictLiteral ||
Style.Language == FormatStyle::LK_Proto) {
Tok->Type = TT_DictLiteral;
} else if (Contexts.back().ColonIsObjCMethodExpr ||
Line.startsWith(TT_ObjCMethodSpecifier)) {
Tok->Type = TT_ObjCMethodExpr;
Tok->Previous->Type = TT_SelectorName;
if (Tok->Previous->ColumnWidth >
Contexts.back().LongestObjCSelectorName)
Contexts.back().LongestObjCSelectorName = Tok->Previous->ColumnWidth;
if (!Contexts.back().FirstObjCSelectorName)
Contexts.back().FirstObjCSelectorName = Tok->Previous;
} 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->Previous->is(tok::r_paren))
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::kw_if:
case tok::kw_while:
if (CurrentToken && CurrentToken->is(tok::l_paren)) {
next();
if (!parseParens(/*LookForDecls=*/true))
return false;
}
break;
case tok::kw_for:
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 (!parseBrace())
return false;
break;
case tok::less:
if (parseAngle()) {
Tok->Type = TT_TemplateOpener;
} 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:
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, 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 &&
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().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;
default:
break;
}
return true;
}
void parseIncludeDirective() {
if (CurrentToken && CurrentToken->is(tok::less)) {
next();
while (CurrentToken) {
if (CurrentToken->isNot(tok::comment) || CurrentToken->Next)
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();
}
}
}
LineType parsePreprocessorDirective() {
LineType Type = LT_PreprocessorDirective;
next();
if (!CurrentToken)
return Type;
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)
next();
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 (code.google.com/p/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;
while (CurrentToken) {
if (CurrentToken->is(tok::kw_virtual))
KeywordVirtualFound = true;
if (isImportStatement(*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 isImportStatement(const FormatToken &Tok) {
// FIXME: Closure-library specific stuff should not be hard-coded but be
// configurable.
return Style.Language == FormatStyle::LK_JavaScript &&
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 == "setTestOnly") &&
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_ForEachMacro,
TT_FunctionLBrace, TT_ImplicitStringLiteral,
TT_InlineASMBrace, TT_JsFatArrow, TT_LambdaArrow,
TT_RegexLiteral))
CurrentToken->Type = 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);
}
/// \brief 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 CaretFound = false;
bool IsForEachMacro = false;
};
/// \brief 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) &&
(!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->Type = 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.isOneOf(tok::r_paren, tok::greater, tok::comma)) {
for (FormatToken *Previous = Current.Previous;
Previous && Previous->isOneOf(tok::star, tok::amp);
Previous = Previous->Previous)
Previous->Type = TT_PointerOrReference;
if (Line.MustBeDeclaration && !Contexts.front().InCtorInitializer)
Contexts.back().IsExpression = false;
} else if (Current.Previous &&
Current.Previous->is(TT_CtorInitializerColon)) {
Contexts.back().IsExpression = true;
Contexts.back().InCtorInitializer = true;
} else if (Current.is(tok::kw_new)) {
Contexts.back().CanBeExpression = false;
} else if (Current.isOneOf(tok::semi, tok::exclaim)) {
// This should be the condition or increment in a for-loop.
Contexts.back().IsExpression = true;
}
}
void determineTokenType(FormatToken &Current) {
if (!Current.is(TT_Unknown))
// The token type is already known.
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.Type = TT_BinaryOperator;
} else if (isStartOfName(Current) &&
(!Line.MightBeFunctionDecl || Current.NestingLevel != 0)) {
Contexts.back().FirstStartOfName = &Current;
Current.Type = TT_StartOfName;
} 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.Type = TT_LambdaArrow;
} else if (Current.is(tok::arrow) && AutoFound && Line.MustBeDeclaration &&
Current.NestingLevel == 0) {
Current.Type = TT_TrailingReturnArrow;
} else if (Current.isOneOf(tok::star, tok::amp, tok::ampamp)) {
Current.Type =
determineStarAmpUsage(Current, Contexts.back().CanBeExpression &&
Contexts.back().IsExpression,
Contexts.back().InTemplateArgument);
} else if (Current.isOneOf(tok::minus, tok::plus, tok::caret)) {
Current.Type = determinePlusMinusCaretUsage(Current);
if (Current.is(TT_UnaryOperator) && Current.is(tok::caret))
Contexts.back().CaretFound = true;
} else if (Current.isOneOf(tok::minusminus, tok::plusplus)) {
Current.Type = determineIncrementUsage(Current);
} else if (Current.isOneOf(tok::exclaim, tok::tilde)) {
Current.Type = TT_UnaryOperator;
} else if (Current.is(tok::question)) {
if (Style.Language == FormatStyle::LK_JavaScript &&
Line.MustBeDeclaration) {
// In JavaScript, `interface X { foo?(): bar; }` is an optional method
// on the interface, not a ternary expression.
Current.Type = TT_JsTypeOptionalQuestion;
} else {
Current.Type = TT_ConditionalExpr;
}
} else if (Current.isBinaryOperator() &&
(!Current.Previous || Current.Previous->isNot(tok::l_square))) {
Current.Type = TT_BinaryOperator;
} else if (Current.is(tok::comment)) {
if (Current.TokenText.startswith("/*")) {
if (Current.TokenText.endswith("*/"))
Current.Type = 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.Type = TT_LineComment;
}
} else if (Current.is(tok::r_paren)) {
if (rParenEndsCast(Current))
Current.Type = TT_CastRParen;
if (Current.MatchingParen && Current.Next &&
!Current.Next->isBinaryOperator() &&
!Current.Next->isOneOf(tok::semi, tok::colon, tok::l_brace))
if (FormatToken *BeforeParen = Current.MatchingParen->Previous)
if (BeforeParen->is(tok::identifier) &&
BeforeParen->TokenText == BeforeParen->TokenText.upper() &&
(!BeforeParen->Previous ||
BeforeParen->Previous->ClosesTemplateDeclaration))
Current.Type = TT_FunctionAnnotationRParen;
} else if (Current.is(tok::at) && Current.Next) {
if (Current.Next->isStringLiteral()) {
Current.Type = TT_ObjCStringLiteral;
} else {
switch (Current.Next->Tok.getObjCKeywordID()) {
case tok::objc_interface:
case tok::objc_implementation:
case tok::objc_protocol:
Current.Type = TT_ObjCDecl;
break;
case tok::objc_property:
Current.Type = 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.Type = TT_DesignatedInitializerPeriod;
else if (Style.Language == FormatStyle::LK_Java && Current.Previous &&
Current.Previous->isOneOf(TT_JavaAnnotation,
TT_LeadingJavaAnnotation)) {
Current.Type = Current.Previous->Type;
}
} else if (Current.isOneOf(tok::identifier, tok::kw_const) &&
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.Type = 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.Type = TT_LeadingJavaAnnotation;
else
Current.Type = TT_JavaAnnotation;
} else if (Current.Previous->is(tok::period) &&
Current.Previous->isOneOf(TT_JavaAnnotation,
TT_LeadingJavaAnnotation)) {
Current.Type = Current.Previous->Type;
}
}
}
/// \brief 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))
return false;
// Skip "const" as it does not have an influence on whether this is a name.
FormatToken *PreviousNotConst = Tok.Previous;
while (PreviousNotConst && PreviousNotConst->is(tok::kw_const))
PreviousNotConst = PreviousNotConst->Previous;
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->MatchingParen &&
PreviousNotConst->MatchingParen->Previous &&
PreviousNotConst->MatchingParen->Previous->is(tok::kw_decltype))
return true;
return (!IsPPKeyword &&
PreviousNotConst->isOneOf(tok::identifier, tok::kw_auto)) ||
PreviousNotConst->is(TT_PointerOrReference) ||
PreviousNotConst->isSimpleTypeSpecifier();
}
/// \brief Determine whether ')' is ending a cast.
bool rParenEndsCast(const FormatToken &Tok) {
// C-style casts are only used in C++ and Java.
if (Style.Language != FormatStyle::LK_Cpp &&
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 an opening 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))
return false;
}
if (Tok.Next->is(tok::question))
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.
bool ParensAreType =
!Tok.Previous ||
Tok.Previous->isOneOf(TT_PointerOrReference, TT_TemplateCloser) ||
Tok.Previous->isSimpleTypeSpecifier();
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;
// If the following token is an identifier, this is a cast. All cases where
// this can be something else are handled above.
if (Tok.Next->is(tok::identifier))
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;
}
/// \brief 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;
const FormatToken *PrevToken = Tok.getPreviousNonComment();
if (!PrevToken)
return TT_UnaryOperator;
const FormatToken *NextToken = Tok.getNextNonComment();
if (!NextToken ||
NextToken->isOneOf(tok::arrow, Keywords.kw_final,
Keywords.kw_override) ||
(NextToken->is(tok::l_brace) && !NextToken->getNextNonComment()))
return TT_PointerOrReference;
if (PrevToken->is(tok::coloncolon))
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::equal, tok::kw_delete, tok::kw_sizeof) ||
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->is(tok::r_paren) && PrevToken->MatchingParen &&
PrevToken->MatchingParen->Previous &&
PrevToken->MatchingParen->Previous->isOneOf(tok::kw_typeof,
tok::kw_decltype))
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 && NextToken->is(tok::l_paren))
return TT_BinaryOperator;
// This catches some cases where evaluation order is used as control flow:
// aaa && aaa->f();
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 || PrevToken->is(TT_CastRParen))
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))
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;
}
/// \brief 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;
/// \brief 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) {}
/// \brief Parse expressions with the given operatore 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) ||
(CurrentPrecedence != -1 && CurrentPrecedence < Precedence) ||
(CurrentPrecedence == prec::Conditional &&
Precedence == prec::Assignment && Current->is(tok::colon))) {
break;
}
// Consume scopes: (), [], <> and {}
if (Current->opensScope()) {
while (Current && !Current->closesScope()) {
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:
/// \brief 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 && NextNonComment->is(tok::colon) &&
NextNonComment->is(TT_DictLiteral))
return prec::Comma;
if (Current->is(TT_LambdaArrow))
return prec::Comma;
if (Current->is(TT_JsFatArrow))
return prec::Assignment;
if (Current->isOneOf(tok::semi, TT_InlineASMColon, TT_SelectorName,
TT_JsComputedPropertyName) ||
(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 (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 &&
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;
}
}
/// \brief Parse unary operator expressions and surround them with fake
/// parentheses if appropriate.
void parseUnaryOperator() {
if (!Current || Current->isNot(TT_UnaryOperator)) {
parse(PrecedenceArrowAndPeriod);
return;
}
FormatToken *Start = Current;
next();
parseUnaryOperator();
// The actual precedence doesn't matter.
addFakeParenthesis(Start, 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) {
if (NextNonCommentLine && (*I)->First->is(tok::comment) &&
(*I)->First->Next == nullptr)
(*I)->Level = NextNonCommentLine->Level;
else
NextNonCommentLine = (*I)->First->isNot(tok::r_brace) ? (*I) : nullptr;
setCommentLineLevels((*I)->Children);
}
}
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();
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) {
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->is(tok::l_square) &&
Next->Next->Next && Next->Next->Next->is(tok::r_square))
Next = Next->Next->Next;
continue;
}
break;
}
return nullptr;
};
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;
}
}
}
if (!Next || !Next->is(tok::l_paren))
return false;
if (Next->Next == Next->MatchingParen)
return true;
for (const FormatToken *Tok = Next->Next; Tok && Tok != Next->MatchingParen;
Tok = Tok->Next) {
if (Tok->is(tok::kw_const) || Tok->isSimpleTypeSpecifier() ||
Tok->isOneOf(TT_PointerOrReference, TT_StartOfName))
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.First->ColumnWidth;
if (!Line.First->Next)
return;
FormatToken *Current = Line.First->Next;
bool InFunctionDecl = Line.MightBeFunctionDecl;
while (Current) {
if (isFunctionDeclarationName(*Current))
Current->Type = TT_FunctionDeclarationName;
if (Current->is(TT_LineComment)) {
if (Current->Previous->BlockKind == BK_BracedInit &&
Current->Previous->opensScope())
Current->SpacesRequiredBefore = Style.Cpp11BracedListStyle ? 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.
Current->SplitPenalty = 20 * Current->BindingStrength +
splitPenalty(Line, *Current, InFunctionDecl);
Current = Current->Next;
}
calculateUnbreakableTailLengths(Line);
for (Current = Line.First; Current != nullptr; Current = Current->Next) {
if (Current->Role)
Current->Role->precomputeFormattingInfos(Current);
}
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(tok::comma) || (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 25;
// 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))
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 150;
if (Left.is(TT_CastRParen))
return 100;
if (Left.is(tok::coloncolon) ||
(Right.is(tok::period) && Style.Language == FormatStyle::LK_Proto))
return 500;
if (Left.isOneOf(tok::kw_class, tok::kw_struct))
return 5000;
if (Left.isOneOf(TT_RangeBasedForLoopColon, TT_InheritanceColon))
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;
if (Left.is(tok::l_paren) && InFunctionDecl &&
Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign)
return 100;
if (Left.is(tok::l_paren) && Left.Previous &&
Left.Previous->isOneOf(tok::kw_if, tok::kw_for))
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 (Style.AlignAfterOpenBracket == FormatStyle::BAS_DontAlign)
return 0;
return Left.ParameterCount > 1 ? Style.PenaltyBreakBeforeFirstCallParameter
: 19;
}
if (Left.is(TT_JavaAnnotation))
return 50;
if (Right.is(tok::lessless)) {
if (Left.is(tok::string_literal) &&
(Right.NextOperator || Right.OperatorIndex != 1)) {
StringRef Content = Left.TokenText;
if (Content.startswith("\""))
Content = Content.drop_front(1);
if (Content.endswith("\""))
Content = Content.drop_back(1);
Content = Content.trim();
if (Content.size() > 1 &&
(Content.back() == ':' || Content.back() == '='))
return 25;
}
return 1; // Breaking at a << is really cheap.
}
if (Left.is(TT_ConditionalExpr))
return prec::Conditional;
prec::Level Level = Left.getPrecedence();
if (Level != prec::Unknown)
return Level;
Level = Right.getPrecedence();
if (Level != prec::Unknown)
return Level;
return 3;
}
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 (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))
return Style.SpaceInEmptyParentheses;
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) &&
(Left.is(tok::kw_template) ||
(Line.Type == LT_ObjCDecl && Style.ObjCSpaceBeforeProtocolList)))
return true;
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))
return false;
if (Right.is(tok::ellipsis))
return Left.Tok.isLiteral();
if (Left.is(tok::l_square) && Right.is(tok::amp))
return false;
if (Right.is(TT_PointerOrReference))
return (Left.is(tok::r_paren) && Left.MatchingParen &&
(Left.MatchingParen->is(TT_OverloadedOperatorLParen) ||
(Left.MatchingParen->Previous &&
Left.MatchingParen->Previous->is(TT_FunctionDeclarationName)))) ||
(Left.Tok.isLiteral() ||
(!Left.isOneOf(TT_PointerOrReference, tok::l_paren) &&
(Style.PointerAlignment != FormatStyle::PAS_Left ||
Line.IsMultiVariableDeclStmt)));
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))
return Right.Tok.isLiteral() ||
Right.isOneOf(TT_BlockComment, Keywords.kw_final,
Keywords.kw_override) ||
(Right.is(tok::l_brace) && Right.BlockKind == 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));
if (Right.is(tok::star) && Left.is(tok::l_paren))
return false;
if (Left.is(tok::l_square))
return (Left.is(TT_ArrayInitializerLSquare) &&
Style.SpacesInContainerLiterals && Right.isNot(tok::r_square)) ||
(Left.is(TT_ArraySubscriptLSquare) && Style.SpacesInSquareBrackets &&
Right.isNot(tok::r_square));
if (Right.is(tok::r_square))
return Right.MatchingParen &&
((Style.SpacesInContainerLiterals &&
Right.MatchingParen->is(TT_ArrayInitializerLSquare)) ||
(Style.SpacesInSquareBrackets &&
Right.MatchingParen->is(TT_ArraySubscriptLSquare)));
if (Right.is(tok::l_square) &&
!Right.isOneOf(TT_ObjCMethodExpr, TT_LambdaLSquare) &&
!Left.isOneOf(tok::numeric_constant, TT_DictLiteral))
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.BlockKind != BK_Block) ||
(Right.is(tok::r_brace) && Right.MatchingParen &&
Right.MatchingParen->BlockKind != BK_Block))
return !Style.Cpp11BracedListStyle;
if (Left.is(TT_BlockComment))
return !Left.TokenText.endswith("=*/");
if (Right.is(tok::l_paren)) {
if (Left.is(tok::r_paren) && Left.is(TT_AttributeParen))
return true;
return Line.Type == LT_ObjCDecl || Left.is(tok::semi) ||
(Style.SpaceBeforeParens != FormatStyle::SBPO_Never &&
(Left.isOneOf(tok::kw_if, tok::pp_elif, tok::kw_for, tok::kw_while,
tok::kw_switch, tok::kw_case, TT_ForEachMacro,
TT_ObjCForIn) ||
(Left.isOneOf(tok::kw_try, Keywords.kw___except, tok::kw_catch,
tok::kw_new, tok::kw_delete) &&
(!Left.Previous || Left.Previous->isNot(tok::period))))) ||
(Style.SpaceBeforeParens == FormatStyle::SBPO_Always &&
(Left.is(tok::identifier) || Left.isFunctionLikeKeyword() ||
Left.is(tok::r_paren)) &&
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.BlockKind != 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))
// A.<B>DoSomething();
return false;
if (Left.is(TT_TemplateCloser) && Right.is(tok::l_square))
return false;
return true;
}
bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
const FormatToken &Right) {
const FormatToken &Left = *Right.Previous;
if (Right.Tok.getIdentifierInfo() && Left.Tok.getIdentifierInfo())
return true; // Never ever merge two identifiers.
if (Style.Language == FormatStyle::LK_Cpp) {
if (Left.is(tok::kw_operator))
return Right.is(tok::coloncolon);
} else if (Style.Language == FormatStyle::LK_Proto) {
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;
} else if (Style.Language == FormatStyle::LK_JavaScript) {
if (Left.isOneOf(Keywords.kw_let, Keywords.kw_var, TT_JsFatArrow,
Keywords.kw_in))
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(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;
} 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 Right.WhitespaceRange.getBegin() != Right.WhitespaceRange.getEnd();
if (Line.Type == LT_ObjCMethodDecl) {
if (Left.is(TT_ObjCMethodSpecifier))
return true;
if (Left.is(tok::r_paren) && Right.is(tok::identifier))
// Don't space between ')' and <id>
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 Style.SpaceBeforeParens == FormatStyle::SBPO_Always;
if (Left.is(tok::comma))
return true;
if (Right.is(tok::comma))
return false;
if (Right.isOneOf(TT_CtorInitializerColon, TT_ObjCBlockLParen))
return true;
if (Right.is(tok::colon)) {
if (Line.First->isOneOf(tok::kw_case, tok::kw_default) ||
!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;
return true;
}
if (Left.is(TT_UnaryOperator))
return 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);
if (Left.is(tok::greater) && Right.is(tok::greater))
return Right.is(TT_TemplateCloser) && Left.is(TT_TemplateCloser) &&
(Style.Standard != FormatStyle::LS_Cpp11 || Style.SpacesInAngles);
if (Right.isOneOf(tok::arrow, tok::period, tok::arrowstar, tok::periodstar) ||
Left.isOneOf(tok::arrow, tok::period, tok::arrowstar, tok::periodstar))
return false;
if (!Style.SpaceBeforeAssignmentOperators &&
Right.getPrecedence() == prec::Assignment)
return false;
if (Right.is(tok::coloncolon) && Left.isNot(tok::l_brace))
return (Left.is(TT_TemplateOpener) &&
Style.Standard == FormatStyle::LS_Cpp03) ||
!(Left.isOneOf(tok::identifier, tok::l_paren, tok::r_paren,
tok::l_square) ||
Left.isOneOf(TT_TemplateCloser, TT_TemplateOpener));
if ((Left.is(TT_TemplateOpener)) != (Right.is(TT_TemplateCloser)))
return Style.SpacesInAngles;
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 Style.SpaceBeforeParens == FormatStyle::SBPO_Always;
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.BlockKind == BK_Block &&
!Tok.isOneOf(TT_ObjCBlockLBrace, TT_DictLiteral);
}
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.Language == FormatStyle::LK_JavaScript) {
// FIXME: This might apply to other languages and token kinds.
if (Right.is(tok::char_constant) && Left.is(tok::plus) && Left.Previous &&
Left.Previous->is(tok::char_constant))
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_export, 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.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_Inline);
} 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;
}
// If the last token before a '}' 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.
const FormatToken *BeforeClosingBrace = nullptr;
if (Left.isOneOf(tok::l_brace, TT_ArrayInitializerLSquare) &&
Left.BlockKind != BK_Block && Left.MatchingParen)
BeforeClosingBrace = Left.MatchingParen->Previous;
else if (Right.MatchingParen &&
Right.MatchingParen->isOneOf(tok::l_brace,
TT_ArrayInitializerLSquare))
BeforeClosingBrace = &Left;
if (BeforeClosingBrace && (BeforeClosingBrace->is(tok::comma) ||
BeforeClosingBrace->isTrailingComment()))
return true;
if (Right.is(tok::comment))
return Left.BlockKind != BK_BracedInit &&
Left.isNot(TT_CtorInitializerColon) &&
(Right.NewlinesBefore > 0 && Right.HasUnescapedNewline);
if (Left.isTrailingComment())
return true;
if (Left.isStringLiteral() &&
(Right.isStringLiteral() || Right.is(TT_ObjCStringLiteral)))
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;
if (Right.Previous->ClosesTemplateDeclaration &&
Right.Previous->MatchingParen &&
Right.Previous->MatchingParen->NestingLevel == 0 &&
Style.AlwaysBreakTemplateDeclarations)
return true;
if ((Right.isOneOf(TT_CtorInitializerComma, TT_CtorInitializerColon)) &&
Style.BreakConstructorInitializersBeforeComma &&
!Style.ConstructorInitializerAllOnOneLineOrOnePerLine)
return true;
if (Right.is(tok::string_literal) && Right.TokenText.startswith("R\""))
// 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.NewlinesBefore > 0;
if (Right.Previous->is(tok::l_brace) && Right.NestingLevel == 1 &&
Style.Language == FormatStyle::LK_Proto)
// Don't put enums onto single lines in protocol buffers.
return true;
if (Right.is(TT_InlineASMBrace))
return Right.HasUnescapedNewline;
if (isAllmanBrace(Left) || isAllmanBrace(Right))
return (Line.startsWith(tok::kw_enum) && Style.BraceWrapping.AfterEnum) ||
(Line.startsWith(tok::kw_class) && Style.BraceWrapping.AfterClass) ||
(Line.startsWith(tok::kw_struct) && Style.BraceWrapping.AfterStruct);
if (Style.Language == FormatStyle::LK_Proto && Left.isNot(tok::l_brace) &&
Right.is(TT_SelectorName))
return true;
if (Left.is(TT_ObjCBlockLBrace) && !Style.AllowShortBlocksOnASingleLine)
return true;
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;
return false;
}
bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
const FormatToken &Right) {
const FormatToken &Left = *Right.Previous;
// Language-specific stuff.
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) {
if (Left.is(tok::kw_return))
return false; // Otherwise a semicolon is inserted.
if (Left.is(TT_JsFatArrow) && Right.is(tok::l_brace))
return false;
if (Left.is(TT_JsTypeColon))
return true;
if (Right.NestingLevel == 0 && Right.is(Keywords.kw_is))
return false;
}
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.BlockKind == BK_BracedInit;
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 (Right.is(TT_InheritanceColon))
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)))
return true;
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.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::l_paren) && Left.is(TT_AttributeParen))
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->BlockKind == 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))
return true;
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_CtorInitializerComma) &&
Style.BreakConstructorInitializersBeforeComma)
return false;
if (Right.is(TT_CtorInitializerComma) &&
Style.BreakConstructorInitializersBeforeComma)
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;
return Left.isOneOf(tok::comma, tok::coloncolon, tok::semi, tok::l_brace,
tok::kw_class, tok::kw_struct) ||
Right.isMemberAccess() ||
Right.isOneOf(TT_TrailingReturnArrow, TT_LambdaArrow, tok::lessless,
tok::colon, tok::l_square, tok::at) ||
(Left.is(tok::r_paren) &&
Right.isOneOf(tok::identifier, tok::kw_const)) ||
(Left.is(tok::l_paren) && !Right.is(tok::r_paren));
}
void TokenAnnotator::printDebugInfo(const AnnotatedLine &Line) {
llvm::errs() << "AnnotatedTokens:\n";
const FormatToken *Tok = Line.First;
while (Tok) {
llvm::errs() << " M=" << Tok->MustBreakBefore
<< " C=" << Tok->CanBreakBefore
<< " T=" << getTokenTypeName(Tok->Type)
<< " S=" << Tok->SpacesRequiredBefore
<< " B=" << Tok->BlockParameterCount
<< " P=" << Tok->SplitPenalty << " Name=" << Tok->Tok.getName()
<< " L=" << Tok->TotalLength << " PPK=" << Tok->PackingKind
<< " FakeLParens=";
for (unsigned i = 0, e = Tok->FakeLParens.size(); i != e; ++i)
llvm::errs() << Tok->FakeLParens[i] << "/";
llvm::errs() << " FakeRParens=" << Tok->FakeRParens << "\n";
if (!Tok->Next)
assert(Tok == Line.Last);
Tok = Tok->Next;
}
llvm::errs() << "----\n";
}
} // namespace format
} // namespace clang