| //===--- 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 "clang/Lex/Lexer.h" |
| |
| namespace clang { |
| namespace format { |
| |
| static bool isBinaryOperator(const AnnotatedToken &Tok) { |
| // Comma is a binary operator, but does not behave as such wrt. formatting. |
| return getPrecedence(Tok) > prec::Comma; |
| } |
| |
| // Returns the previous token ignoring comments. |
| static const AnnotatedToken *getPreviousToken(const AnnotatedToken &Tok) { |
| const AnnotatedToken *PrevToken = Tok.Parent; |
| while (PrevToken != NULL && PrevToken->is(tok::comment)) |
| PrevToken = PrevToken->Parent; |
| return PrevToken; |
| } |
| |
| // Returns the next token ignoring comments. |
| static const AnnotatedToken *getNextToken(const AnnotatedToken &Tok) { |
| if (Tok.Children.empty()) |
| return NULL; |
| const AnnotatedToken *NextToken = &Tok.Children[0]; |
| while (NextToken->is(tok::comment)) { |
| if (NextToken->Children.empty()) |
| return NULL; |
| NextToken = &NextToken->Children[0]; |
| } |
| return NextToken; |
| } |
| |
| /// \brief A parser that gathers additional information about tokens. |
| /// |
| /// The \c TokenAnnotator tries to matches parenthesis and square brakets and |
| /// store a parenthesis levels. It also tries to resolve matching "<" and ">" |
| /// into template parameter lists. |
| class AnnotatingParser { |
| public: |
| AnnotatingParser(SourceManager &SourceMgr, Lexer &Lex, AnnotatedLine &Line) |
| : SourceMgr(SourceMgr), Lex(Lex), Line(Line), CurrentToken(&Line.First), |
| KeywordVirtualFound(false), ColonIsObjCMethodExpr(false), |
| LongestObjCSelectorName(0), FirstObjCSelectorName(NULL), |
| ColonIsForRangeExpr(false), IsExpression(false), |
| LookForFunctionName(Line.MustBeDeclaration), BindingStrength(1) { |
| } |
| |
| /// \brief A helper class to manage AnnotatingParser::ColonIsObjCMethodExpr. |
| struct ObjCSelectorRAII { |
| AnnotatingParser &P; |
| bool ColonWasObjCMethodExpr; |
| |
| ObjCSelectorRAII(AnnotatingParser &P) |
| : P(P), ColonWasObjCMethodExpr(P.ColonIsObjCMethodExpr) { |
| } |
| |
| ~ObjCSelectorRAII() { P.ColonIsObjCMethodExpr = ColonWasObjCMethodExpr; } |
| |
| void markStart(AnnotatedToken &Left) { |
| P.ColonIsObjCMethodExpr = true; |
| P.LongestObjCSelectorName = 0; |
| P.FirstObjCSelectorName = NULL; |
| Left.Type = TT_ObjCMethodExpr; |
| } |
| |
| void markEnd(AnnotatedToken &Right) { Right.Type = TT_ObjCMethodExpr; } |
| }; |
| |
| struct ScopedBindingStrengthIncrease { |
| AnnotatingParser &P; |
| unsigned Increase; |
| |
| ScopedBindingStrengthIncrease(AnnotatingParser &P, unsigned Increase) |
| : P(P), Increase(Increase) { |
| P.BindingStrength += Increase; |
| } |
| |
| ~ScopedBindingStrengthIncrease() { P.BindingStrength -= Increase; } |
| }; |
| |
| bool parseAngle() { |
| if (CurrentToken == NULL) |
| return false; |
| ScopedBindingStrengthIncrease Increase(*this, 10); |
| AnnotatedToken *Left = CurrentToken->Parent; |
| while (CurrentToken != NULL) { |
| if (CurrentToken->is(tok::greater)) { |
| Left->MatchingParen = CurrentToken; |
| CurrentToken->MatchingParen = Left; |
| CurrentToken->Type = TT_TemplateCloser; |
| next(); |
| return true; |
| } |
| if (CurrentToken->is(tok::r_paren) || CurrentToken->is(tok::r_square) || |
| CurrentToken->is(tok::r_brace)) |
| return false; |
| if (CurrentToken->is(tok::pipepipe) || CurrentToken->is(tok::ampamp) || |
| CurrentToken->is(tok::question) || CurrentToken->is(tok::colon)) |
| return false; |
| if (CurrentToken->is(tok::comma)) |
| ++Left->ParameterCount; |
| if (!consumeToken()) |
| return false; |
| } |
| return false; |
| } |
| |
| bool parseParens(bool LookForDecls = false) { |
| if (CurrentToken == NULL) |
| return false; |
| ScopedBindingStrengthIncrease Increase(*this, 1); |
| bool StartsObjCMethodExpr = false; |
| AnnotatedToken *Left = CurrentToken->Parent; |
| if (CurrentToken->is(tok::caret)) { |
| // ^( starts a block. |
| Left->Type = TT_ObjCBlockLParen; |
| } else if (AnnotatedToken *MaybeSel = Left->Parent) { |
| // @selector( starts a selector. |
| if (MaybeSel->isObjCAtKeyword(tok::objc_selector) && MaybeSel->Parent && |
| MaybeSel->Parent->is(tok::at)) { |
| StartsObjCMethodExpr = true; |
| } |
| } |
| |
| ObjCSelectorRAII objCSelector(*this); |
| if (StartsObjCMethodExpr) |
| objCSelector.markStart(*Left); |
| |
| 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->Children.empty()) { |
| AnnotatedToken &Prev = *CurrentToken->Parent; |
| AnnotatedToken &Next = CurrentToken->Children[0]; |
| if (Prev.Parent->is(tok::identifier) && |
| (Prev.is(tok::star) || Prev.is(tok::amp)) && |
| CurrentToken->is(tok::identifier) && Next.isNot(tok::equal)) { |
| Prev.Type = TT_BinaryOperator; |
| LookForDecls = false; |
| } |
| } |
| |
| if (CurrentToken->is(tok::r_paren)) { |
| Left->MatchingParen = CurrentToken; |
| CurrentToken->MatchingParen = Left; |
| |
| if (StartsObjCMethodExpr) { |
| objCSelector.markEnd(*CurrentToken); |
| if (FirstObjCSelectorName != NULL) { |
| FirstObjCSelectorName->LongestObjCSelectorName = |
| LongestObjCSelectorName; |
| } |
| } |
| |
| next(); |
| return true; |
| } |
| if (CurrentToken->is(tok::r_square) || CurrentToken->is(tok::r_brace)) |
| return false; |
| if (CurrentToken->is(tok::comma)) |
| ++Left->ParameterCount; |
| if (!consumeToken()) |
| return false; |
| } |
| return false; |
| } |
| |
| bool parseSquare() { |
| if (!CurrentToken) |
| return false; |
| ScopedBindingStrengthIncrease Increase(*this, 10); |
| |
| // A '[' could be an index subscript (after an indentifier or after |
| // ')' or ']'), or it could be the start of an Objective-C method |
| // expression. |
| AnnotatedToken *Left = CurrentToken->Parent; |
| bool StartsObjCMethodExpr = |
| !Left->Parent || Left->Parent->is(tok::colon) || |
| Left->Parent->is(tok::l_square) || Left->Parent->is(tok::l_paren) || |
| Left->Parent->is(tok::kw_return) || Left->Parent->is(tok::kw_throw) || |
| getBinOpPrecedence(Left->Parent->FormatTok.Tok.getKind(), true, true) > |
| prec::Unknown; |
| |
| ObjCSelectorRAII objCSelector(*this); |
| if (StartsObjCMethodExpr) |
| objCSelector.markStart(*Left); |
| |
| while (CurrentToken != NULL) { |
| if (CurrentToken->is(tok::r_square)) { |
| if (!CurrentToken->Children.empty() && |
| CurrentToken->Children[0].is(tok::l_paren)) { |
| // An ObjC method call can't be followed by an open parenthesis. |
| // FIXME: Do we incorrectly label ":" with this? |
| StartsObjCMethodExpr = false; |
| Left->Type = TT_Unknown; |
| } |
| if (StartsObjCMethodExpr) { |
| objCSelector.markEnd(*CurrentToken); |
| if (Left->Parent != NULL && |
| (Left->Parent->is(tok::star) || Left->Parent->is(tok::amp))) |
| Left->Parent->Type = TT_BinaryOperator; |
| } |
| Left->MatchingParen = CurrentToken; |
| CurrentToken->MatchingParen = Left; |
| if (FirstObjCSelectorName != NULL) |
| FirstObjCSelectorName->LongestObjCSelectorName = |
| LongestObjCSelectorName; |
| next(); |
| return true; |
| } |
| if (CurrentToken->is(tok::r_paren) || CurrentToken->is(tok::r_brace)) |
| return false; |
| if (CurrentToken->is(tok::comma)) |
| ++Left->ParameterCount; |
| if (!consumeToken()) |
| return false; |
| } |
| return false; |
| } |
| |
| bool parseBrace() { |
| // Lines are fine to end with '{'. |
| if (CurrentToken == NULL) |
| return true; |
| ScopedBindingStrengthIncrease Increase(*this, 1); |
| AnnotatedToken *Left = CurrentToken->Parent; |
| while (CurrentToken != NULL) { |
| if (CurrentToken->is(tok::r_brace)) { |
| Left->MatchingParen = CurrentToken; |
| CurrentToken->MatchingParen = Left; |
| next(); |
| return true; |
| } |
| if (CurrentToken->is(tok::r_paren) || CurrentToken->is(tok::r_square)) |
| return false; |
| if (CurrentToken->is(tok::comma)) |
| ++Left->ParameterCount; |
| if (!consumeToken()) |
| return false; |
| } |
| return true; |
| } |
| |
| 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; |
| CurrentToken->Parent->ClosesTemplateDeclaration = true; |
| return true; |
| } |
| return false; |
| } |
| |
| bool consumeToken() { |
| AnnotatedToken *Tok = CurrentToken; |
| next(); |
| switch (Tok->FormatTok.Tok.getKind()) { |
| case tok::plus: |
| case tok::minus: |
| // At the start of the line, +/- specific ObjectiveC method |
| // declarations. |
| if (Tok->Parent == NULL) |
| Tok->Type = TT_ObjCMethodSpecifier; |
| break; |
| case tok::colon: |
| // Colons from ?: are handled in parseConditional(). |
| if (Tok->Parent->is(tok::r_paren)) { |
| Tok->Type = TT_CtorInitializerColon; |
| } else if (ColonIsObjCMethodExpr || |
| Line.First.Type == TT_ObjCMethodSpecifier) { |
| Tok->Type = TT_ObjCMethodExpr; |
| Tok->Parent->Type = TT_ObjCSelectorName; |
| if (Tok->Parent->FormatTok.TokenLength > LongestObjCSelectorName) |
| LongestObjCSelectorName = Tok->Parent->FormatTok.TokenLength; |
| if (FirstObjCSelectorName == NULL) |
| FirstObjCSelectorName = Tok->Parent; |
| } else if (ColonIsForRangeExpr) { |
| Tok->Type = TT_RangeBasedForLoopColon; |
| } |
| 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: |
| ColonIsForRangeExpr = true; |
| next(); |
| if (!parseParens()) |
| return false; |
| break; |
| case tok::l_paren: |
| if (!parseParens()) |
| return false; |
| 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->Parent != NULL) |
| return false; |
| break; |
| case tok::greater: |
| Tok->Type = TT_BinaryOperator; |
| break; |
| case tok::kw_operator: |
| if (CurrentToken != NULL && CurrentToken->is(tok::l_paren)) { |
| CurrentToken->Type = TT_OverloadedOperator; |
| next(); |
| if (CurrentToken != NULL && CurrentToken->is(tok::r_paren)) { |
| CurrentToken->Type = TT_OverloadedOperator; |
| next(); |
| } |
| } else { |
| while (CurrentToken != NULL && CurrentToken->isNot(tok::l_paren)) { |
| CurrentToken->Type = TT_OverloadedOperator; |
| next(); |
| } |
| } |
| break; |
| case tok::question: |
| parseConditional(); |
| break; |
| case tok::kw_template: |
| parseTemplateDeclaration(); |
| 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->Children.empty()) |
| CurrentToken->Type = TT_ImplicitStringLiteral; |
| next(); |
| } |
| } else { |
| while (CurrentToken != NULL) { |
| 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->FormatTok.Tok.getIdentifierInfo() == NULL) |
| return; |
| switch (CurrentToken->FormatTok.Tok.getIdentifierInfo()->getPPKeywordID()) { |
| case tok::pp_include: |
| case tok::pp_import: |
| parseIncludeDirective(); |
| break; |
| case tok::pp_error: |
| case tok::pp_warning: |
| parseWarningOrError(); |
| break; |
| default: |
| break; |
| } |
| while (CurrentToken != NULL) |
| next(); |
| } |
| |
| LineType parseLine() { |
| int PeriodsAndArrows = 0; |
| 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->is(tok::period) || CurrentToken->is(tok::arrow)) |
| ++PeriodsAndArrows; |
| if (getPrecedence(*CurrentToken) > prec::Assignment && |
| CurrentToken->isNot(tok::less) && CurrentToken->isNot(tok::greater)) |
| CanBeBuilderTypeStmt = false; |
| if (!consumeToken()) |
| return LT_Invalid; |
| } |
| if (KeywordVirtualFound) |
| return LT_VirtualFunctionDecl; |
| |
| // Assume a builder-type call if there are 2 or more "." and "->". |
| if (PeriodsAndArrows >= 2 && CanBeBuilderTypeStmt) |
| return LT_BuilderTypeCall; |
| |
| if (Line.First.Type == TT_ObjCMethodSpecifier) { |
| if (FirstObjCSelectorName != NULL) |
| FirstObjCSelectorName->LongestObjCSelectorName = |
| LongestObjCSelectorName; |
| return LT_ObjCMethodDecl; |
| } |
| |
| return LT_Other; |
| } |
| |
| void next() { |
| if (CurrentToken != NULL) { |
| determineTokenType(*CurrentToken); |
| CurrentToken->BindingStrength = BindingStrength; |
| } |
| |
| if (CurrentToken != NULL && !CurrentToken->Children.empty()) |
| CurrentToken = &CurrentToken->Children[0]; |
| else |
| CurrentToken = NULL; |
| } |
| |
| private: |
| SourceManager &SourceMgr; |
| Lexer &Lex; |
| AnnotatedLine &Line; |
| AnnotatedToken *CurrentToken; |
| bool KeywordVirtualFound; |
| bool ColonIsObjCMethodExpr; |
| unsigned LongestObjCSelectorName; |
| AnnotatedToken *FirstObjCSelectorName; |
| bool ColonIsForRangeExpr; |
| bool IsExpression; |
| bool LookForFunctionName; |
| |
| unsigned BindingStrength; |
| |
| void determineTokenType(AnnotatedToken &Current) { |
| if (getPrecedence(Current) == prec::Assignment) { |
| IsExpression = true; |
| AnnotatedToken *Previous = Current.Parent; |
| while (Previous != NULL) { |
| if (Previous->Type == TT_BinaryOperator && |
| (Previous->is(tok::star) || Previous->is(tok::amp))) { |
| Previous->Type = TT_PointerOrReference; |
| } |
| Previous = Previous->Parent; |
| } |
| } |
| if (Current.is(tok::kw_return) || Current.is(tok::kw_throw) || |
| (Current.is(tok::l_paren) && !Line.MustBeDeclaration && |
| (Current.Parent == NULL || Current.Parent->isNot(tok::kw_for)))) |
| IsExpression = true; |
| |
| if (Current.Type == TT_Unknown) { |
| if (LookForFunctionName && Current.is(tok::l_paren)) { |
| findFunctionName(&Current); |
| LookForFunctionName = false; |
| } else if (Current.is(tok::star) || Current.is(tok::amp)) { |
| Current.Type = determineStarAmpUsage(Current, IsExpression); |
| } else if (Current.is(tok::minus) || Current.is(tok::plus) || |
| Current.is(tok::caret)) { |
| Current.Type = determinePlusMinusCaretUsage(Current); |
| } else if (Current.is(tok::minusminus) || Current.is(tok::plusplus)) { |
| Current.Type = determineIncrementUsage(Current); |
| } else if (Current.is(tok::exclaim)) { |
| Current.Type = TT_UnaryOperator; |
| } else if (isBinaryOperator(Current)) { |
| Current.Type = TT_BinaryOperator; |
| } else if (Current.is(tok::comment)) { |
| std::string Data(Lexer::getSpelling(Current.FormatTok.Tok, SourceMgr, |
| Lex.getLangOpts())); |
| if (StringRef(Data).startswith("//")) |
| Current.Type = TT_LineComment; |
| else |
| Current.Type = TT_BlockComment; |
| } else if (Current.is(tok::r_paren) && |
| (Current.Parent->Type == TT_PointerOrReference || |
| Current.Parent->Type == TT_TemplateCloser) && |
| (Current.Children.empty() || |
| (Current.Children[0].isNot(tok::equal) && |
| Current.Children[0].isNot(tok::semi) && |
| Current.Children[0].isNot(tok::l_brace)))) { |
| // FIXME: We need to get smarter and understand more cases of casts. |
| Current.Type = TT_CastRParen; |
| } else if (Current.is(tok::at) && Current.Children.size()) { |
| switch (Current.Children[0].FormatTok.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; |
| } |
| } |
| } |
| } |
| |
| /// \brief Starting from \p Current, this searches backwards for an |
| /// identifier which could be the start of a function name and marks it. |
| void findFunctionName(AnnotatedToken *Current) { |
| AnnotatedToken *Parent = Current->Parent; |
| while (Parent != NULL && Parent->Parent != NULL) { |
| if (Parent->is(tok::identifier) && |
| (Parent->Parent->is(tok::identifier) || |
| Parent->Parent->Type == TT_PointerOrReference || |
| Parent->Parent->Type == TT_TemplateCloser)) { |
| Parent->Type = TT_StartOfName; |
| break; |
| } |
| Parent = Parent->Parent; |
| } |
| } |
| |
| /// \brief Return the type of the given token assuming it is * or &. |
| TokenType |
| determineStarAmpUsage(const AnnotatedToken &Tok, bool IsExpression) { |
| const AnnotatedToken *PrevToken = getPreviousToken(Tok); |
| if (PrevToken == NULL) |
| return TT_UnaryOperator; |
| |
| const AnnotatedToken *NextToken = getNextToken(Tok); |
| if (NextToken == NULL) |
| return TT_Unknown; |
| |
| if (NextToken->is(tok::l_square)) |
| return TT_PointerOrReference; |
| |
| if (PrevToken->is(tok::l_paren) || PrevToken->is(tok::l_square) || |
| PrevToken->is(tok::l_brace) || PrevToken->is(tok::comma) || |
| PrevToken->is(tok::kw_return) || PrevToken->is(tok::colon) || |
| PrevToken->Type == TT_BinaryOperator || |
| PrevToken->Type == TT_UnaryOperator || PrevToken->Type == TT_CastRParen) |
| return TT_UnaryOperator; |
| |
| if (PrevToken->FormatTok.Tok.isLiteral() || PrevToken->is(tok::r_paren) || |
| PrevToken->is(tok::r_square) || NextToken->FormatTok.Tok.isLiteral() || |
| NextToken->is(tok::plus) || NextToken->is(tok::minus) || |
| NextToken->is(tok::plusplus) || NextToken->is(tok::minusminus) || |
| NextToken->is(tok::tilde) || NextToken->is(tok::exclaim) || |
| NextToken->is(tok::l_paren) || NextToken->is(tok::l_square) || |
| NextToken->is(tok::kw_alignof) || NextToken->is(tok::kw_sizeof)) |
| return TT_BinaryOperator; |
| |
| if (NextToken->is(tok::comma) || NextToken->is(tok::r_paren) || |
| NextToken->is(tok::greater)) |
| return TT_PointerOrReference; |
| |
| // 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 AnnotatedToken &Tok) { |
| const AnnotatedToken *PrevToken = getPreviousToken(Tok); |
| if (PrevToken == NULL) |
| return TT_UnaryOperator; |
| |
| // Use heuristics to recognize unary operators. |
| if (PrevToken->is(tok::equal) || PrevToken->is(tok::l_paren) || |
| PrevToken->is(tok::comma) || PrevToken->is(tok::l_square) || |
| PrevToken->is(tok::question) || PrevToken->is(tok::colon) || |
| PrevToken->is(tok::kw_return) || PrevToken->is(tok::kw_case) || |
| PrevToken->is(tok::at) || PrevToken->is(tok::l_brace)) |
| return TT_UnaryOperator; |
| |
| // There can't be to 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 AnnotatedToken &Tok) { |
| const AnnotatedToken *PrevToken = getPreviousToken(Tok); |
| if (PrevToken == NULL) |
| return TT_UnaryOperator; |
| if (PrevToken->is(tok::r_paren) || PrevToken->is(tok::r_square) || |
| PrevToken->is(tok::identifier)) |
| return TT_TrailingUnaryOperator; |
| |
| return TT_UnaryOperator; |
| } |
| }; |
| |
| void TokenAnnotator::annotate() { |
| AnnotatingParser Parser(SourceMgr, Lex, Line); |
| Line.Type = Parser.parseLine(); |
| if (Line.Type == LT_Invalid) |
| return; |
| |
| 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.SpaceRequiredBefore = true; |
| Line.First.MustBreakBefore = Line.First.FormatTok.MustBreakBefore; |
| Line.First.CanBreakBefore = Line.First.MustBreakBefore; |
| |
| Line.First.TotalLength = Line.First.FormatTok.TokenLength; |
| if (!Line.First.Children.empty()) |
| calculateFormattingInformation(Line.First.Children[0]); |
| } |
| |
| void TokenAnnotator::calculateFormattingInformation(AnnotatedToken &Current) { |
| Current.SpaceRequiredBefore = spaceRequiredBefore(Current); |
| |
| if (Current.FormatTok.MustBreakBefore) { |
| Current.MustBreakBefore = true; |
| } else if (Current.Type == TT_LineComment) { |
| Current.MustBreakBefore = Current.FormatTok.NewlinesBefore > 0; |
| } else if ((Current.Parent->is(tok::comment) && |
| Current.FormatTok.NewlinesBefore > 0) || |
| (Current.is(tok::string_literal) && |
| Current.Parent->is(tok::string_literal))) { |
| Current.MustBreakBefore = true; |
| } else if (Current.is(tok::lessless) && !Current.Children.empty() && |
| Current.Parent->is(tok::string_literal) && |
| Current.Children[0].is(tok::string_literal)) { |
| Current.MustBreakBefore = true; |
| } else { |
| Current.MustBreakBefore = false; |
| } |
| Current.CanBreakBefore = Current.MustBreakBefore || canBreakBefore(Current); |
| if (Current.MustBreakBefore) |
| Current.TotalLength = Current.Parent->TotalLength + Style.ColumnLimit; |
| else |
| Current.TotalLength = |
| Current.Parent->TotalLength + Current.FormatTok.TokenLength + |
| (Current.SpaceRequiredBefore ? 1 : 0); |
| // 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(Current); |
| if (!Current.Children.empty()) |
| calculateFormattingInformation(Current.Children[0]); |
| } |
| |
| unsigned TokenAnnotator::splitPenalty(const AnnotatedToken &Tok) { |
| const AnnotatedToken &Left = *Tok.Parent; |
| const AnnotatedToken &Right = Tok; |
| |
| if (Left.is(tok::l_brace) && Right.isNot(tok::l_brace)) |
| return 50; |
| if (Left.is(tok::equal) && Right.is(tok::l_brace)) |
| return 150; |
| if (Left.is(tok::coloncolon)) |
| return 500; |
| |
| if (Left.Type == TT_RangeBasedForLoopColon) |
| return 5; |
| |
| if (Right.is(tok::arrow) || Right.is(tok::period)) { |
| if (Left.is(tok::r_paren) && Line.Type == LT_BuilderTypeCall) |
| return 5; // Should be smaller than breaking at a nested comma. |
| return 150; |
| } |
| |
| // In for-loops, prefer breaking at ',' and ';'. |
| if (Line.First.is(tok::kw_for) && |
| (Left.isNot(tok::comma) && Left.isNot(tok::semi))) |
| return 20; |
| |
| if (Left.is(tok::semi)) |
| return 0; |
| if (Left.is(tok::comma)) |
| return 1; |
| |
| // 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) || Left.is(tok::l_square) || |
| Left.Type == TT_TemplateOpener) |
| return 20; |
| |
| if (Right.is(tok::lessless)) |
| return prec::Shift; |
| if (Left.Type == TT_ConditionalExpr) |
| return prec::Assignment; |
| prec::Level Level = getPrecedence(Left); |
| |
| if (Level != prec::Unknown) |
| return Level; |
| |
| return 3; |
| } |
| |
| bool TokenAnnotator::spaceRequiredBetween(const AnnotatedToken &Left, |
| const AnnotatedToken &Right) { |
| if (Right.is(tok::hashhash)) |
| return Left.is(tok::hash); |
| if (Left.is(tok::hashhash) || Left.is(tok::hash)) |
| return Right.is(tok::hash); |
| if (Right.is(tok::r_paren) || Right.is(tok::semi) || Right.is(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.is(tok::exclaim) || Left.is(tok::tilde)) |
| return false; |
| if (Left.is(tok::at) && |
| (Right.is(tok::identifier) || Right.is(tok::string_literal) || |
| Right.is(tok::char_constant) || Right.is(tok::numeric_constant) || |
| Right.is(tok::l_paren) || Right.is(tok::l_brace) || |
| Right.is(tok::kw_true) || Right.is(tok::kw_false))) |
| return false; |
| if (Left.is(tok::coloncolon)) |
| return false; |
| if (Right.is(tok::coloncolon)) |
| return Left.isNot(tok::identifier) && Left.isNot(tok::greater); |
| if (Left.is(tok::less) || Right.is(tok::greater) || Right.is(tok::less)) |
| return false; |
| if (Right.is(tok::amp) || Right.is(tok::star)) |
| return Left.FormatTok.Tok.isLiteral() || |
| (Left.isNot(tok::star) && Left.isNot(tok::amp) && |
| !Style.PointerAndReferenceBindToType); |
| if (Left.is(tok::amp) || Left.is(tok::star)) |
| return Right.FormatTok.Tok.isLiteral() || |
| Style.PointerAndReferenceBindToType; |
| if (Right.is(tok::star) && Left.is(tok::l_paren)) |
| return false; |
| if (Left.is(tok::l_square) || Right.is(tok::r_square)) |
| return false; |
| if (Right.is(tok::l_square) && Right.Type != TT_ObjCMethodExpr) |
| return false; |
| if (Left.is(tok::period) || Right.is(tok::period)) |
| 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)) { |
| return Line.Type == LT_ObjCDecl || Left.is(tok::kw_if) || |
| Left.is(tok::kw_for) || Left.is(tok::kw_while) || |
| Left.is(tok::kw_switch) || Left.is(tok::kw_return) || |
| Left.is(tok::kw_catch) || Left.is(tok::kw_new) || |
| Left.is(tok::kw_delete); |
| } |
| if (Left.is(tok::at) && |
| Right.FormatTok.Tok.getObjCKeywordID() != tok::objc_not_keyword) |
| return false; |
| if (Left.is(tok::l_brace) && Right.is(tok::r_brace)) |
| return false; |
| return true; |
| } |
| |
| bool TokenAnnotator::spaceRequiredBefore(const AnnotatedToken &Tok) { |
| if (Line.Type == LT_ObjCMethodDecl) { |
| if (Tok.is(tok::identifier) && !Tok.Children.empty() && |
| Tok.Children[0].is(tok::colon) && Tok.Parent->is(tok::identifier)) |
| return true; |
| if (Tok.is(tok::colon)) |
| return false; |
| if (Tok.Parent->Type == TT_ObjCMethodSpecifier) |
| return true; |
| if (Tok.Parent->is(tok::r_paren) && Tok.is(tok::identifier)) |
| // Don't space between ')' and <id> |
| return false; |
| if (Tok.Parent->is(tok::colon) && Tok.is(tok::l_paren)) |
| // Don't space between ':' and '(' |
| return false; |
| } |
| if (Line.Type == LT_ObjCProperty && |
| (Tok.is(tok::equal) || Tok.Parent->is(tok::equal))) |
| return false; |
| |
| if (Tok.Parent->is(tok::comma)) |
| return true; |
| if (Tok.Type == TT_CtorInitializerColon || Tok.Type == TT_ObjCBlockLParen) |
| return true; |
| if (Tok.Type == TT_OverloadedOperator) |
| return Tok.is(tok::identifier) || Tok.is(tok::kw_new) || |
| Tok.is(tok::kw_delete) || Tok.is(tok::kw_bool); |
| if (Tok.Parent->Type == TT_OverloadedOperator) |
| return false; |
| if (Tok.is(tok::colon)) |
| return Line.First.isNot(tok::kw_case) && !Tok.Children.empty() && |
| Tok.Type != TT_ObjCMethodExpr; |
| if (Tok.Parent->Type == TT_UnaryOperator || Tok.Parent->Type == TT_CastRParen) |
| return false; |
| if (Tok.Type == TT_UnaryOperator) |
| return Tok.Parent->isNot(tok::l_paren) && |
| Tok.Parent->isNot(tok::l_square) && Tok.Parent->isNot(tok::at) && |
| (Tok.Parent->isNot(tok::colon) || |
| Tok.Parent->Type != TT_ObjCMethodExpr); |
| if (Tok.Parent->is(tok::greater) && Tok.is(tok::greater)) { |
| return Tok.Type == TT_TemplateCloser && Tok.Parent->Type == |
| TT_TemplateCloser && Style.SplitTemplateClosingGreater; |
| } |
| if (Tok.Type == TT_BinaryOperator || Tok.Parent->Type == TT_BinaryOperator) |
| return true; |
| if (Tok.Parent->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(*Tok.Parent, Tok); |
| } |
| |
| bool TokenAnnotator::canBreakBefore(const AnnotatedToken &Right) { |
| const AnnotatedToken &Left = *Right.Parent; |
| if (Line.Type == LT_ObjCMethodDecl) { |
| if (Right.is(tok::identifier) && !Right.Children.empty() && |
| Right.Children[0].is(tok::colon) && Left.is(tok::identifier)) |
| return true; |
| if (Right.is(tok::identifier) && Left.is(tok::l_paren) && |
| Left.Parent->is(tok::colon)) |
| // Don't break this identifier as ':' or identifier |
| // before it will break. |
| return false; |
| if (Right.is(tok::colon) && Left.is(tok::identifier) && Left.CanBreakBefore) |
| // Don't break at ':' if identifier before it can beak. |
| return false; |
| } |
| if (Right.Type == TT_StartOfName && Style.AllowReturnTypeOnItsOwnLine) |
| return true; |
| if (Right.is(tok::colon) && Right.Type == TT_ObjCMethodExpr) |
| return false; |
| if (Left.is(tok::colon) && 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 (Left.Type == TT_RangeBasedForLoopColon) |
| return true; |
| if (Left.Type == TT_PointerOrReference || Left.Type == TT_TemplateCloser || |
| Left.Type == TT_UnaryOperator || Left.Type == TT_ConditionalExpr || |
| Left.is(tok::question)) |
| return false; |
| if (Left.is(tok::equal) && Line.Type == LT_VirtualFunctionDecl) |
| return false; |
| |
| if (Right.Type == TT_LineComment) |
| // We rely on MustBreakBefore being set correctly here as we should not |
| // change the "binding" behavior of a comment. |
| 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.Parent != NULL && |
| Left.Parent->is(tok::r_paren)) |
| return Right.isNot(tok::l_brace) && Right.isNot(tok::semi) && |
| Right.isNot(tok::equal); |
| |
| // 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 false; |
| |
| if (Right.is(tok::r_paren) || Right.is(tok::greater)) |
| return false; |
| return (isBinaryOperator(Left) && Left.isNot(tok::lessless)) || |
| Left.is(tok::comma) || Right.is(tok::lessless) || |
| Right.is(tok::arrow) || Right.is(tok::period) || |
| Right.is(tok::colon) || Left.is(tok::coloncolon) || |
| Left.is(tok::semi) || Left.is(tok::l_brace) || |
| (Left.is(tok::r_paren) && Left.Type != TT_CastRParen && |
| Right.is(tok::identifier)) || |
| (Left.is(tok::l_paren) && !Right.is(tok::r_paren)) || |
| (Left.is(tok::l_square) && !Right.is(tok::r_square)); |
| } |
| |
| } // namespace format |
| } // namespace clang |