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llvm-project/clang/lib/Format/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/Support/Debug.h"
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(AnnotatedLine &Line, IdentifierInfo &Ident_in)
: Line(Line), CurrentToken(Line.First), KeywordVirtualFound(false),
NameFound(false), AutoFound(false), Ident_in(Ident_in) {
Contexts.push_back(Context(tok::unknown, 1, /*IsExpression=*/false));
}
private:
bool parseAngle() {
if (CurrentToken == NULL)
return false;
ScopedContextCreator ContextCreator(*this, tok::less, 10);
FormatToken *Left = CurrentToken->Previous;
Contexts.back().IsExpression = false;
while (CurrentToken != NULL) {
if (CurrentToken->is(tok::greater)) {
Left->MatchingParen = CurrentToken;
CurrentToken->MatchingParen = Left;
CurrentToken->Type = TT_TemplateCloser;
next();
return true;
}
if (CurrentToken->isOneOf(tok::r_paren, tok::r_square, tok::r_brace,
tok::question, tok::colon))
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->Type == TT_BinaryOperator ||
Contexts[Contexts.size() - 2].IsExpression) &&
Line.First->isNot(tok::kw_template))
return false;
updateParameterCount(Left, CurrentToken);
if (!consumeToken())
return false;
}
return false;
}
bool parseParens(bool LookForDecls = false) {
if (CurrentToken == NULL)
return false;
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;
FormatToken *Left = CurrentToken->Previous;
if (CurrentToken->is(tok::caret)) {
// ^( starts a block.
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 (StartsObjCMethodExpr) {
Contexts.back().ColonIsObjCMethodExpr = true;
Left->Type = TT_ObjCMethodExpr;
}
bool MightBeFunctionType = CurrentToken->is(tok::star);
bool HasMultipleLines = false;
bool HasMultipleParametersOnALine = false;
while (CurrentToken != NULL) {
// 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->is(tok::r_paren)) {
if (MightBeFunctionType && CurrentToken->Next &&
(CurrentToken->Next->is(tok::l_paren) ||
(CurrentToken->Next->is(tok::l_square) &&
!Contexts.back().IsExpression)))
Left->Type = TT_FunctionTypeLParen;
Left->MatchingParen = CurrentToken;
CurrentToken->MatchingParen = Left;
if (StartsObjCMethodExpr) {
CurrentToken->Type = TT_ObjCMethodExpr;
if (Contexts.back().FirstObjCSelectorName != NULL) {
Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
Contexts.back().LongestObjCSelectorName;
}
}
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->Previous->Type == TT_PointerOrReference &&
CurrentToken->Previous->Previous->isOneOf(tok::l_paren,
tok::coloncolon))
MightBeFunctionType = true;
updateParameterCount(Left, CurrentToken);
if (CurrentToken->is(tok::comma) && CurrentToken->Next &&
!CurrentToken->Next->HasUnescapedNewline &&
!CurrentToken->Next->isTrailingComment())
HasMultipleParametersOnALine = true;
if (!consumeToken())
return false;
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 the start of an Objective-C array literal.
FormatToken *Left = CurrentToken->Previous;
FormatToken *Parent = Left->getPreviousNonComment();
bool StartsObjCMethodExpr =
Contexts.back().CanBeExpression &&
(!Parent || Parent->isOneOf(tok::colon, tok::l_square, tok::l_paren,
tok::kw_return, tok::kw_throw) ||
Parent->isUnaryOperator() || Parent->Type == TT_ObjCForIn ||
Parent->Type == TT_CastRParen ||
getBinOpPrecedence(Parent->Tok.getKind(), true, true) > prec::Unknown);
ScopedContextCreator ContextCreator(*this, tok::l_square, 10);
Contexts.back().IsExpression = true;
bool StartsObjCArrayLiteral = Parent && Parent->is(tok::at);
if (StartsObjCMethodExpr) {
Contexts.back().ColonIsObjCMethodExpr = true;
Left->Type = TT_ObjCMethodExpr;
} else if (StartsObjCArrayLiteral) {
Left->Type = TT_ObjCArrayLiteral;
}
while (CurrentToken != NULL) {
if (CurrentToken->is(tok::r_square)) {
if (CurrentToken->Next && CurrentToken->Next->is(tok::l_paren)) {
// 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->Type = TT_ObjCMethodExpr;
// determineStarAmpUsage() thinks that '*' '[' is allocating an
// array of pointers, but if '[' starts a selector then '*' is a
// binary operator.
if (Parent != NULL && Parent->Type == TT_PointerOrReference)
Parent->Type = TT_BinaryOperator;
} else if (StartsObjCArrayLiteral) {
CurrentToken->Type = TT_ObjCArrayLiteral;
}
Left->MatchingParen = CurrentToken;
CurrentToken->MatchingParen = Left;
if (Contexts.back().FirstObjCSelectorName != NULL)
Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
Contexts.back().LongestObjCSelectorName;
next();
return true;
}
if (CurrentToken->isOneOf(tok::r_paren, tok::r_brace))
return false;
updateParameterCount(Left, CurrentToken);
if (!consumeToken())
return false;
}
return false;
}
bool parseBrace() {
if (CurrentToken != NULL) {
ScopedContextCreator ContextCreator(*this, tok::l_brace, 1);
FormatToken *Left = CurrentToken->Previous;
FormatToken *Parent = Left->getPreviousNonComment();
bool StartsObjCDictLiteral = Parent && Parent->is(tok::at);
if (StartsObjCDictLiteral) {
Contexts.back().ColonIsObjCDictLiteral = true;
Left->Type = TT_ObjCDictLiteral;
}
while (CurrentToken != NULL) {
if (CurrentToken->is(tok::r_brace)) {
if (StartsObjCDictLiteral)
CurrentToken->Type = TT_ObjCDictLiteral;
Left->MatchingParen = CurrentToken;
CurrentToken->MatchingParen = Left;
next();
return true;
}
if (CurrentToken->isOneOf(tok::r_paren, tok::r_square))
return false;
updateParameterCount(Left, CurrentToken);
if (!consumeToken())
return false;
}
}
// No closing "}" found, this probably starts a definition.
Line.StartsDefinition = true;
return true;
}
void updateParameterCount(FormatToken *Left, FormatToken *Current) {
if (Current->is(tok::comma)) {
++Left->ParameterCount;
} else if (Left->ParameterCount == 0 && Current->isNot(tok::comment)) {
Left->ParameterCount = 1;
}
}
bool parseConditional() {
while (CurrentToken != NULL) {
if (CurrentToken->is(tok::colon)) {
CurrentToken->Type = TT_ConditionalExpr;
next();
return true;
}
if (!consumeToken())
return false;
}
return false;
}
bool parseTemplateDeclaration() {
if (CurrentToken != NULL && CurrentToken->is(tok::less)) {
CurrentToken->Type = TT_TemplateOpener;
next();
if (!parseAngle())
return false;
if (CurrentToken != NULL)
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 == NULL && Line.MustBeDeclaration)
Tok->Type = TT_ObjCMethodSpecifier;
break;
case tok::colon:
if (Tok->Previous == NULL)
return false;
// Colons from ?: are handled in parseConditional().
if (Tok->Previous->is(tok::r_paren) && Contexts.size() == 1) {
Tok->Type = TT_CtorInitializerColon;
} else if (Contexts.back().ColonIsObjCDictLiteral) {
Tok->Type = TT_ObjCDictLiteral;
} else if (Contexts.back().ColonIsObjCMethodExpr ||
Line.First->Type == TT_ObjCMethodSpecifier) {
Tok->Type = TT_ObjCMethodExpr;
Tok->Previous->Type = TT_ObjCSelectorName;
if (Tok->Previous->CodePointCount >
Contexts.back().LongestObjCSelectorName) {
Contexts.back().LongestObjCSelectorName =
Tok->Previous->CodePointCount;
}
if (Contexts.back().FirstObjCSelectorName == NULL)
Contexts.back().FirstObjCSelectorName = Tok->Previous;
} else if (Contexts.back().ColonIsForRangeExpr) {
Tok->Type = TT_RangeBasedForLoopColon;
} else if (Contexts.size() == 1) {
Tok->Type = TT_InheritanceColon;
} else if (Contexts.back().ContextKind == tok::l_paren) {
Tok->Type = TT_InlineASMColon;
}
break;
case tok::kw_if:
case tok::kw_while:
if (CurrentToken != NULL && 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:
if (!parseParens())
return false;
if (Line.MustBeDeclaration && NameFound && !Contexts.back().IsExpression)
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;
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 != NULL)
return false;
break;
case tok::greater:
Tok->Type = TT_BinaryOperator;
break;
case tok::kw_operator:
while (CurrentToken && CurrentToken->isNot(tok::l_paren)) {
if (CurrentToken->isOneOf(tok::star, tok::amp))
CurrentToken->Type = TT_PointerOrReference;
consumeToken();
}
if (CurrentToken) {
CurrentToken->Type = TT_OverloadedOperatorLParen;
if (CurrentToken->Previous->Type == TT_BinaryOperator)
CurrentToken->Previous->Type = TT_OverloadedOperator;
}
break;
case tok::question:
parseConditional();
break;
case tok::kw_template:
parseTemplateDeclaration();
break;
case tok::identifier:
if (Line.First->is(tok::kw_for) &&
Tok->Tok.getIdentifierInfo() == &Ident_in)
Tok->Type = TT_ObjCForIn;
break;
case tok::comma:
if (Contexts.back().FirstStartOfName)
Contexts.back().FirstStartOfName->PartOfMultiVariableDeclStmt = true;
break;
default:
break;
}
return true;
}
void parseIncludeDirective() {
next();
if (CurrentToken != NULL && CurrentToken->is(tok::less)) {
next();
while (CurrentToken != NULL) {
if (CurrentToken->isNot(tok::comment) || CurrentToken->Next)
CurrentToken->Type = TT_ImplicitStringLiteral;
next();
}
} else {
while (CurrentToken != NULL) {
if (CurrentToken->is(tok::string_literal))
// Mark these string literals as "implicit" literals, too, so that
// they are not split or line-wrapped.
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 != NULL) {
CurrentToken->Type = TT_ImplicitStringLiteral;
next();
}
}
void parsePreprocessorDirective() {
next();
if (CurrentToken == NULL)
return;
// Hashes in the middle of a line can lead to any strange token
// sequence.
if (CurrentToken->Tok.getIdentifierInfo() == NULL)
return;
switch (CurrentToken->Tok.getIdentifierInfo()->getPPKeywordID()) {
case tok::pp_include:
case tok::pp_import:
parseIncludeDirective();
break;
case tok::pp_error:
case tok::pp_warning:
parseWarningOrError();
break;
case tok::pp_if:
case tok::pp_elif:
parseLine();
break;
default:
break;
}
while (CurrentToken != NULL)
next();
}
public:
LineType parseLine() {
int PeriodsAndArrows = 0;
FormatToken *LastPeriodOrArrow = NULL;
bool CanBeBuilderTypeStmt = true;
if (CurrentToken->is(tok::hash)) {
parsePreprocessorDirective();
return LT_PreprocessorDirective;
}
while (CurrentToken != NULL) {
if (CurrentToken->is(tok::kw_virtual))
KeywordVirtualFound = true;
if (CurrentToken->isOneOf(tok::period, tok::arrow)) {
++PeriodsAndArrows;
LastPeriodOrArrow = CurrentToken;
}
FormatToken *TheToken = CurrentToken;
if (!consumeToken())
return LT_Invalid;
if (TheToken->getPrecedence() > prec::Assignment &&
TheToken->Type == TT_BinaryOperator)
CanBeBuilderTypeStmt = false;
}
if (KeywordVirtualFound)
return LT_VirtualFunctionDecl;
// Assume a builder-type call if there are 2 or more "." and "->".
if (PeriodsAndArrows >= 2 && CanBeBuilderTypeStmt) {
LastPeriodOrArrow->LastInChainOfCalls = true;
return LT_BuilderTypeCall;
}
if (Line.First->Type == TT_ObjCMethodSpecifier) {
if (Contexts.back().FirstObjCSelectorName != NULL)
Contexts.back().FirstObjCSelectorName->LongestObjCSelectorName =
Contexts.back().LongestObjCSelectorName;
return LT_ObjCMethodDecl;
}
return LT_Other;
}
private:
void next() {
if (CurrentToken != NULL) {
determineTokenType(*CurrentToken);
CurrentToken->BindingStrength = Contexts.back().BindingStrength;
}
if (CurrentToken != NULL)
CurrentToken = CurrentToken->Next;
// 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 != NULL)
CurrentToken->Type = TT_Unknown;
}
/// \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),
LongestObjCSelectorName(0), ColonIsForRangeExpr(false),
ColonIsObjCDictLiteral(false), ColonIsObjCMethodExpr(false),
FirstObjCSelectorName(NULL), FirstStartOfName(NULL),
IsExpression(IsExpression), CanBeExpression(true) {}
tok::TokenKind ContextKind;
unsigned BindingStrength;
unsigned LongestObjCSelectorName;
bool ColonIsForRangeExpr;
bool ColonIsObjCDictLiteral;
bool ColonIsObjCMethodExpr;
FormatToken *FirstObjCSelectorName;
FormatToken *FirstStartOfName;
bool IsExpression;
bool CanBeExpression;
};
/// \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 determineTokenType(FormatToken &Current) {
if (Current.getPrecedence() == prec::Assignment &&
(!Current.Previous || Current.Previous->isNot(tok::kw_operator))) {
Contexts.back().IsExpression = true;
for (FormatToken *Previous = Current.Previous;
Previous && Previous->isNot(tok::comma);
Previous = Previous->Previous) {
if (Previous->is(tok::r_square))
Previous = Previous->MatchingParen;
if (Previous->Type == TT_BinaryOperator &&
Previous->isOneOf(tok::star, tok::amp)) {
Previous->Type = TT_PointerOrReference;
}
}
} else if (Current.isOneOf(tok::kw_return, tok::kw_throw) ||
(Current.is(tok::l_paren) && !Line.MustBeDeclaration &&
!Line.InPPDirective &&
(!Current.Previous || Current.Previous->isNot(tok::kw_for)))) {
Contexts.back().IsExpression = true;
} else if (Current.isOneOf(tok::r_paren, tok::greater, tok::comma)) {
for (FormatToken *Previous = Current.Previous;
Previous && Previous->isOneOf(tok::star, tok::amp);
Previous = Previous->Previous)
Previous->Type = TT_PointerOrReference;
} else if (Current.Previous &&
Current.Previous->Type == TT_CtorInitializerColon) {
Contexts.back().IsExpression = true;
} else if (Current.is(tok::kw_new)) {
Contexts.back().CanBeExpression = false;
} else if (Current.is(tok::semi)) {
// This should be the condition or increment in a for-loop.
Contexts.back().IsExpression = true;
}
if (Current.Type == TT_Unknown) {
if (isStartOfName(Current)) {
Contexts.back().FirstStartOfName = &Current;
Current.Type = TT_StartOfName;
NameFound = true;
} else if (Current.is(tok::kw_auto)) {
AutoFound = true;
} else if (Current.is(tok::arrow) && AutoFound &&
Line.MustBeDeclaration) {
Current.Type = TT_TrailingReturnArrow;
} else if (Current.isOneOf(tok::star, tok::amp, tok::ampamp)) {
Current.Type =
determineStarAmpUsage(Current, Contexts.back().CanBeExpression &&
Contexts.back().IsExpression);
} else if (Current.isOneOf(tok::minus, tok::plus, tok::caret)) {
Current.Type = determinePlusMinusCaretUsage(Current);
} else if (Current.isOneOf(tok::minusminus, tok::plusplus)) {
Current.Type = determineIncrementUsage(Current);
} else if (Current.is(tok::exclaim)) {
Current.Type = TT_UnaryOperator;
} else if (Current.isBinaryOperator()) {
Current.Type = TT_BinaryOperator;
} else if (Current.is(tok::comment)) {
if (Current.TokenText.startswith("//"))
Current.Type = TT_LineComment;
else
Current.Type = TT_BlockComment;
} else if (Current.is(tok::r_paren)) {
FormatToken *LeftOfParens = NULL;
if (Current.MatchingParen)
LeftOfParens = Current.MatchingParen->getPreviousNonComment();
bool IsCast = false;
bool ParensAreEmpty = Current.Previous == Current.MatchingParen;
bool ParensAreType = !Current.Previous ||
Current.Previous->Type == TT_PointerOrReference ||
Current.Previous->Type == TT_TemplateCloser ||
isSimpleTypeSpecifier(*Current.Previous);
bool ParensCouldEndDecl =
Current.Next &&
Current.Next->isOneOf(tok::equal, tok::semi, tok::l_brace);
bool IsSizeOfOrAlignOf =
LeftOfParens &&
LeftOfParens->isOneOf(tok::kw_sizeof, tok::kw_alignof);
if (ParensAreType && !ParensCouldEndDecl && !IsSizeOfOrAlignOf &&
(Contexts.back().IsExpression ||
(Current.Next && Current.Next->isBinaryOperator())))
IsCast = true;
if (Current.Next && Current.Next->isNot(tok::string_literal) &&
(Current.Next->Tok.isLiteral() ||
Current.Next->isOneOf(tok::kw_sizeof, tok::kw_alignof)))
IsCast = true;
// If there is an identifier after the (), it is likely a cast, unless
// there is also an identifier before the ().
if (LeftOfParens && (LeftOfParens->Tok.getIdentifierInfo() == NULL ||
LeftOfParens->is(tok::kw_return)) &&
LeftOfParens->Type != TT_OverloadedOperator &&
LeftOfParens->Type != TT_TemplateCloser && Current.Next &&
Current.Next->is(tok::identifier))
IsCast = true;
if (IsCast && !ParensAreEmpty)
Current.Type = TT_CastRParen;
} else if (Current.is(tok::at) && Current.Next) {
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;
}
}
}
/// \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 == NULL)
return false;
// Skip "const" as it does not have an influence on whether this is a name.
FormatToken *PreviousNotConst = Tok.Previous;
while (PreviousNotConst != NULL && PreviousNotConst->is(tok::kw_const))
PreviousNotConst = PreviousNotConst->Previous;
if (PreviousNotConst == NULL)
return false;
bool IsPPKeyword = PreviousNotConst->is(tok::identifier) &&
PreviousNotConst->Previous &&
PreviousNotConst->Previous->is(tok::hash);
return (!IsPPKeyword && PreviousNotConst->is(tok::identifier)) ||
PreviousNotConst->Type == TT_PointerOrReference ||
PreviousNotConst->Type == TT_TemplateCloser ||
isSimpleTypeSpecifier(*PreviousNotConst);
}
/// \brief Return the type of the given token assuming it is * or &.
TokenType determineStarAmpUsage(const FormatToken &Tok, bool IsExpression) {
const FormatToken *PrevToken = Tok.getPreviousNonComment();
if (PrevToken == NULL)
return TT_UnaryOperator;
const FormatToken *NextToken = Tok.getNextNonComment();
if (NextToken == NULL)
return TT_Unknown;
if (PrevToken->is(tok::coloncolon) ||
(PrevToken->is(tok::l_paren) && !IsExpression))
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) ||
PrevToken->Type == TT_BinaryOperator ||
PrevToken->Type == TT_UnaryOperator || PrevToken->Type == TT_CastRParen)
return TT_UnaryOperator;
if (NextToken->is(tok::l_square))
return TT_PointerOrReference;
if (PrevToken->Tok.isLiteral() ||
PrevToken->isOneOf(tok::r_paren, tok::r_square) ||
NextToken->Tok.isLiteral() || NextToken->isUnaryOperator())
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)
return TT_BinaryOperator;
return TT_PointerOrReference;
}
TokenType determinePlusMinusCaretUsage(const FormatToken &Tok) {
const FormatToken *PrevToken = Tok.getPreviousNonComment();
if (PrevToken == NULL || PrevToken->Type == 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->Type == 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 == NULL || PrevToken->Type == TT_CastRParen)
return TT_UnaryOperator;
if (PrevToken->isOneOf(tok::r_paren, tok::r_square, tok::identifier))
return TT_TrailingUnaryOperator;
return TT_UnaryOperator;
}
// FIXME: This is copy&pasted from Sema. Put it in a common place and remove
// duplication.
/// \brief Determine whether the token kind starts a simple-type-specifier.
bool isSimpleTypeSpecifier(const FormatToken &Tok) const {
switch (Tok.Tok.getKind()) {
case tok::kw_short:
case tok::kw_long:
case tok::kw___int64:
case tok::kw___int128:
case tok::kw_signed:
case tok::kw_unsigned:
case tok::kw_void:
case tok::kw_char:
case tok::kw_int:
case tok::kw_half:
case tok::kw_float:
case tok::kw_double:
case tok::kw_wchar_t:
case tok::kw_bool:
case tok::kw___underlying_type:
case tok::annot_typename:
case tok::kw_char16_t:
case tok::kw_char32_t:
case tok::kw_typeof:
case tok::kw_decltype:
return true;
default:
return false;
}
}
SmallVector<Context, 8> Contexts;
AnnotatedLine &Line;
FormatToken *CurrentToken;
bool KeywordVirtualFound;
bool NameFound;
bool AutoFound;
IdentifierInfo &Ident_in;
};
/// \brief Parses binary expressions by inserting fake parenthesis based on
/// operator precedence.
class ExpressionParser {
public:
ExpressionParser(AnnotatedLine &Line) : Current(Line.First) {
// Skip leading "}", e.g. in "} else if (...) {".
if (Current->is(tok::r_brace))
next();
}
/// \brief Parse expressions with the given operatore precedence.
void parse(int Precedence = 0) {
// Conditional expressions need to be parsed separately for proper nesting.
if (Precedence == prec::Conditional + 1) {
parseConditionalExpr();
return;
}
if (Precedence > prec::PointerToMember || Current == NULL)
return;
FormatToken *Start = Current;
bool OperatorFound = false;
while (Current) {
// Consume operators with higher precedence.
parse(Precedence + 1);
int CurrentPrecedence = 0;
if (Current) {
if (Current->Type == TT_ConditionalExpr)
CurrentPrecedence = 1 + (int)prec::Conditional;
else if (Current->is(tok::semi) || Current->Type == TT_InlineASMColon)
CurrentPrecedence = 1;
else if (Current->Type == TT_BinaryOperator || Current->is(tok::comma))
CurrentPrecedence = 1 + (int)Current->getPrecedence();
}
// At the end of the line or when an operator with higher precedence is
// found, insert fake parenthesis and return.
if (Current == NULL || Current->closesScope() ||
(CurrentPrecedence != 0 && CurrentPrecedence < Precedence)) {
if (OperatorFound)
addFakeParenthesis(Start, prec::Level(Precedence - 1));
return;
}
// Consume scopes: (), [], <> and {}
if (Current->opensScope()) {
while (Current && !Current->closesScope()) {
next();
parse();
}
next();
} else {
// Operator found.
if (CurrentPrecedence == Precedence)
OperatorFound = true;
next();
}
}
}
private:
void addFakeParenthesis(FormatToken *Start, prec::Level Precedence) {
Start->FakeLParens.push_back(Precedence);
if (Current)
++Current->Previous->FakeRParens;
}
void parseConditionalExpr() {
FormatToken *Start = Current;
parse(prec::LogicalOr + 1);
if (!Current || !Current->is(tok::question))
return;
next();
parse(prec::LogicalOr + 1);
if (!Current || Current->Type != TT_ConditionalExpr)
return;
next();
parseConditionalExpr();
addFakeParenthesis(Start, prec::Conditional);
}
void next() {
if (Current)
Current = Current->Next;
while (Current && Current->isTrailingComment())
Current = Current->Next;
}
FormatToken *Current;
};
} // end anonymous namespace
void TokenAnnotator::annotate(AnnotatedLine &Line) {
AnnotatingParser Parser(Line, Ident_in);
Line.Type = Parser.parseLine();
if (Line.Type == LT_Invalid)
return;
ExpressionParser ExprParser(Line);
ExprParser.parse();
if (Line.First->Type == TT_ObjCMethodSpecifier)
Line.Type = LT_ObjCMethodDecl;
else if (Line.First->Type == TT_ObjCDecl)
Line.Type = LT_ObjCDecl;
else if (Line.First->Type == TT_ObjCProperty)
Line.Type = LT_ObjCProperty;
Line.First->SpacesRequiredBefore = 1;
Line.First->CanBreakBefore = Line.First->MustBreakBefore;
}
void TokenAnnotator::calculateFormattingInformation(AnnotatedLine &Line) {
Line.First->TotalLength = Line.First->CodePointCount;
if (!Line.First->Next)
return;
FormatToken *Current = Line.First->Next;
while (Current != NULL) {
if (Current->Type == TT_LineComment)
Current->SpacesRequiredBefore = Style.SpacesBeforeTrailingComments;
else
Current->SpacesRequiredBefore =
spaceRequiredBefore(Line, *Current) ? 1 : 0;
if (Current->is(tok::comment)) {
Current->MustBreakBefore = Current->NewlinesBefore > 0;
} else if (Current->Previous->isTrailingComment() ||
(Current->is(tok::string_literal) &&
Current->Previous->is(tok::string_literal))) {
Current->MustBreakBefore = true;
} else if (Current->Previous->IsUnterminatedLiteral) {
Current->MustBreakBefore = true;
} else if (Current->is(tok::lessless) && Current->Next &&
Current->Previous->is(tok::string_literal) &&
Current->Next->is(tok::string_literal)) {
Current->MustBreakBefore = true;
} else if (Current->Previous->ClosesTemplateDeclaration &&
Style.AlwaysBreakTemplateDeclarations) {
Current->MustBreakBefore = true;
}
Current->CanBreakBefore =
Current->MustBreakBefore || canBreakBefore(Line, *Current);
if (Current->MustBreakBefore ||
(Current->is(tok::string_literal) &&
Current->TokenText.find("\\\n") != StringRef::npos))
Current->TotalLength = Current->Previous->TotalLength + Style.ColumnLimit;
else
Current->TotalLength = Current->Previous->TotalLength +
Current->CodePointCount +
Current->SpacesRequiredBefore;
// 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);
Current = Current->Next;
}
calculateUnbreakableTailLengths(Line);
DEBUG({
printDebugInfo(Line);
});
}
void TokenAnnotator::calculateUnbreakableTailLengths(AnnotatedLine &Line) {
unsigned UnbreakableTailLength = 0;
FormatToken *Current = Line.Last;
while (Current != NULL) {
Current->UnbreakableTailLength = UnbreakableTailLength;
if (Current->CanBreakBefore ||
Current->isOneOf(tok::comment, tok::string_literal)) {
UnbreakableTailLength = 0;
} else {
UnbreakableTailLength +=
Current->CodePointCount + Current->SpacesRequiredBefore;
}
Current = Current->Previous;
}
}
unsigned TokenAnnotator::splitPenalty(const AnnotatedLine &Line,
const FormatToken &Tok) {
const FormatToken &Left = *Tok.Previous;
const FormatToken &Right = Tok;
if (Left.is(tok::semi))
return 0;
if (Left.is(tok::comma))
return 1;
if (Right.is(tok::l_square))
return 150;
if (Right.Type == TT_StartOfName || Right.is(tok::kw_operator)) {
if (Line.First->is(tok::kw_for) && Right.PartOfMultiVariableDeclStmt)
return 3;
if (Left.Type == TT_StartOfName)
return 20;
else if (Line.MightBeFunctionDecl && Right.BindingStrength == 1)
// FIXME: Clean up hack of using BindingStrength to find top-level names.
return Style.PenaltyReturnTypeOnItsOwnLine;
else
return 200;
}
if (Left.is(tok::equal) && Right.is(tok::l_brace))
return 150;
if (Left.Type == TT_CastRParen)
return 100;
if (Left.is(tok::coloncolon))
return 500;
if (Left.isOneOf(tok::kw_class, tok::kw_struct))
return 5000;
if (Left.Type == TT_RangeBasedForLoopColon ||
Left.Type == TT_InheritanceColon)
return 2;
if (Right.isOneOf(tok::arrow, tok::period) &&
Right.Type != TT_DesignatedInitializerPeriod) {
if (Line.Type == LT_BuilderTypeCall)
return prec::PointerToMember;
if (Left.isOneOf(tok::r_paren, tok::r_square) && Left.MatchingParen &&
Left.MatchingParen->ParameterCount > 0)
return 20; // Should be smaller than breaking at a nested comma.
return 150;
}
// Breaking before a trailing 'const' or not-function-like annotation is bad.
if (Left.is(tok::r_paren) &&
(Right.is(tok::kw_const) || (Right.is(tok::identifier) && Right.Next &&
Right.Next->isNot(tok::l_paren))))
return 150;
// In for-loops, prefer breaking at ',' and ';'.
if (Line.First->is(tok::kw_for) && Left.is(tok::equal))
return 4;
// In Objective-C method expressions, prefer breaking before "param:" over
// breaking after it.
if (Right.Type == TT_ObjCSelectorName)
return 0;
if (Left.is(tok::colon) && Left.Type == TT_ObjCMethodExpr)
return 20;
if (Left.is(tok::l_paren) && Line.MightBeFunctionDecl)
return 100;
if (Left.opensScope())
return Left.ParameterCount > 1 ? prec::Comma : 20;
if (Right.is(tok::lessless)) {
if (Left.is(tok::string_literal)) {
StringRef Content = Left.TokenText;
Content = Content.drop_back(1).drop_front(1).trim();
if (Content.size() > 1 &&
(Content.back() == ':' || Content.back() == '='))
return 25;
}
return 1; // Breaking at a << is really cheap.
}
if (Left.Type == TT_ConditionalExpr)
return prec::Conditional;
prec::Level Level = Left.getPrecedence();
if (Level != prec::Unknown)
return Level;
return 3;
}
bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
const FormatToken &Left,
const FormatToken &Right) {
if (Right.is(tok::hashhash))
return Left.is(tok::hash);
if (Left.isOneOf(tok::hashhash, tok::hash))
return Right.is(tok::hash);
if (Right.isOneOf(tok::r_paren, 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.is(tok::arrow) || Right.is(tok::arrow))
return false;
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::coloncolon))
return false;
if (Right.is(tok::coloncolon))
return !Left.isOneOf(tok::identifier, tok::greater, tok::l_paren);
if (Left.is(tok::less) || Right.isOneOf(tok::greater, tok::less))
return false;
if (Right.is(tok::ellipsis))
return false;
if (Right.Type == TT_PointerOrReference)
return Left.Tok.isLiteral() ||
((Left.Type != TT_PointerOrReference) && Left.isNot(tok::l_paren) &&
!Style.PointerBindsToType);
if (Right.Type == TT_FunctionTypeLParen && Left.isNot(tok::l_paren) &&
(Left.Type != TT_PointerOrReference || Style.PointerBindsToType))
return true;
if (Left.Type == TT_PointerOrReference)
return Right.Tok.isLiteral() || Right.Type == TT_BlockComment ||
((Right.Type != TT_PointerOrReference) &&
Right.isNot(tok::l_paren) && Style.PointerBindsToType &&
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.Type == TT_ObjCArrayLiteral && Right.isNot(tok::r_square);
if (Right.is(tok::r_square))
return Right.Type == TT_ObjCArrayLiteral;
if (Right.is(tok::l_square) && Right.Type != TT_ObjCMethodExpr)
return false;
if (Left.is(tok::colon))
return Left.Type != TT_ObjCMethodExpr;
if (Right.is(tok::colon))
return Right.Type != TT_ObjCMethodExpr;
if (Left.is(tok::l_paren))
return false;
if (Right.is(tok::l_paren)) {
if (Left.is(tok::r_paren) && Left.MatchingParen &&
Left.MatchingParen->Previous &&
Left.MatchingParen->Previous->is(tok::kw___attribute))
return true;
return Line.Type == LT_ObjCDecl ||
Left.isOneOf(tok::kw_if, tok::kw_for, tok::kw_while, tok::kw_switch,
tok::kw_return, tok::kw_catch, tok::kw_new,
tok::kw_delete, tok::semi);
}
if (Left.is(tok::at) && Right.Tok.getObjCKeywordID() != tok::objc_not_keyword)
return false;
if (Left.is(tok::l_brace) && Right.is(tok::r_brace))
return false; // No spaces in "{}".
if (Left.is(tok::l_brace) || Right.is(tok::r_brace))
return !Style.Cpp11BracedListStyle;
if (Right.Type == TT_UnaryOperator)
return !Left.isOneOf(tok::l_paren, tok::l_square, tok::at) &&
(Left.isNot(tok::colon) || Left.Type != TT_ObjCMethodExpr);
if (Left.isOneOf(tok::identifier, tok::greater, tok::r_square) &&
Right.is(tok::l_brace) && Right.getNextNonComment())
return false;
if (Left.is(tok::period) || Right.is(tok::period))
return false;
if (Left.Type == TT_BlockComment && Left.TokenText.endswith("=*/"))
return false;
return true;
}
bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
const FormatToken &Tok) {
if (Tok.Tok.getIdentifierInfo() && Tok.Previous->Tok.getIdentifierInfo())
return true; // Never ever merge two identifiers.
if (Line.Type == LT_ObjCMethodDecl) {
if (Tok.Previous->Type == TT_ObjCMethodSpecifier)
return true;
if (Tok.Previous->is(tok::r_paren) && Tok.is(tok::identifier))
// Don't space between ')' and <id>
return false;
}
if (Line.Type == LT_ObjCProperty &&
(Tok.is(tok::equal) || Tok.Previous->is(tok::equal)))
return false;
if (Tok.Type == TT_TrailingReturnArrow ||
Tok.Previous->Type == TT_TrailingReturnArrow)
return true;
if (Tok.Previous->is(tok::comma))
return true;
if (Tok.is(tok::comma))
return false;
if (Tok.Type == TT_CtorInitializerColon || Tok.Type == TT_ObjCBlockLParen)
return true;
if (Tok.Previous->Tok.is(tok::kw_operator))
return false;
if (Tok.Type == TT_OverloadedOperatorLParen)
return false;
if (Tok.is(tok::colon))
return !Line.First->isOneOf(tok::kw_case, tok::kw_default) &&
Tok.getNextNonComment() != NULL && Tok.Type != TT_ObjCMethodExpr;
if (Tok.Previous->Type == TT_UnaryOperator ||
Tok.Previous->Type == TT_CastRParen)
return false;
if (Tok.Previous->is(tok::greater) && Tok.is(tok::greater)) {
return Tok.Type == TT_TemplateCloser &&
Tok.Previous->Type == TT_TemplateCloser &&
Style.Standard != FormatStyle::LS_Cpp11;
}
if (Tok.isOneOf(tok::arrowstar, tok::periodstar) ||
Tok.Previous->isOneOf(tok::arrowstar, tok::periodstar))
return false;
if (Tok.Type == TT_BinaryOperator || Tok.Previous->Type == TT_BinaryOperator)
return true;
if (Tok.Previous->Type == TT_TemplateCloser && Tok.is(tok::l_paren))
return false;
if (Tok.is(tok::less) && Line.First->is(tok::hash))
return true;
if (Tok.Type == TT_TrailingUnaryOperator)
return false;
return spaceRequiredBetween(Line, *Tok.Previous, Tok);
}
bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
const FormatToken &Right) {
const FormatToken &Left = *Right.Previous;
if (Right.Type == TT_StartOfName || Right.is(tok::kw_operator))
return true;
if (Right.is(tok::colon) &&
(Right.Type == TT_ObjCDictLiteral || Right.Type == TT_ObjCMethodExpr))
return false;
if (Left.is(tok::colon) &&
(Left.Type == TT_ObjCDictLiteral || Left.Type == TT_ObjCMethodExpr))
return true;
if (Right.Type == TT_ObjCSelectorName)
return true;
if (Left.ClosesTemplateDeclaration)
return true;
if (Right.Type == TT_ConditionalExpr || Right.is(tok::question))
return true;
if (Right.Type == TT_RangeBasedForLoopColon ||
Right.Type == TT_OverloadedOperatorLParen)
return false;
if (Left.Type == TT_RangeBasedForLoopColon)
return true;
if (Right.Type == TT_RangeBasedForLoopColon)
return false;
if (Left.Type == TT_PointerOrReference || Left.Type == TT_TemplateCloser ||
Left.Type == TT_UnaryOperator || Left.Type == TT_ConditionalExpr ||
Left.isOneOf(tok::question, tok::kw_operator))
return false;
if (Left.is(tok::equal) && Line.Type == LT_VirtualFunctionDecl)
return false;
if (Left.Previous) {
if (Left.is(tok::l_paren) && Right.is(tok::l_paren) &&
Left.Previous->is(tok::kw___attribute))
return false;
if (Left.is(tok::l_paren) && (Left.Previous->Type == TT_BinaryOperator ||
Left.Previous->Type == TT_CastRParen))
return false;
}
if (Right.isTrailingComment())
// We rely on MustBreakBefore being set correctly here as we should not
// change the "binding" behavior of a comment.
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.isOneOf(tok::r_brace, tok::r_paren, tok::greater))
return false;
// Allow breaking after a trailing 'const', e.g. after a method declaration,
// unless it is follow by ';', '{' or '='.
if (Left.is(tok::kw_const) && Left.Previous != NULL &&
Left.Previous->is(tok::r_paren))
return !Right.isOneOf(tok::l_brace, tok::semi, tok::equal);
if (Right.is(tok::kw___attribute))
return true;
if (Left.is(tok::identifier) && Right.is(tok::string_literal))
return true;
return (Left.isBinaryOperator() && Left.isNot(tok::lessless)) ||
Left.isOneOf(tok::comma, tok::coloncolon, tok::semi, tok::l_brace,
tok::kw_class, tok::kw_struct) ||
Right.isOneOf(tok::lessless, tok::arrow, tok::period, tok::colon) ||
(Left.is(tok::r_paren) &&
Right.isOneOf(tok::identifier, tok::kw_const, tok::kw___attribute)) ||
(Left.is(tok::l_paren) && !Right.is(tok::r_paren)) ||
Right.is(tok::l_square);
}
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=" << Tok->Type
<< " S=" << Tok->SpacesRequiredBefore
<< " P=" << Tok->SplitPenalty << " Name=" << Tok->Tok.getName()
<< " 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";
Tok = Tok->Next;
}
llvm::errs() << "----\n";
}
} // namespace format
} // namespace clang
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