lib/Format/UnwrappedLineParser.cpp - fp2-dev/platform/external/clang - Gitiles

 //===--- UnwrappedLineParser.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 contains the implementation of the UnwrappedLineParser,
 /// which turns a stream of tokens into UnwrappedLines.
 ///
 //===----------------------------------------------------------------------===//

 #define DEBUG_TYPE "format-parser"

 #include "UnwrappedLineParser.h"
 #include "clang/Basic/Diagnostic.h"
 #include "llvm/Support/Debug.h"

 namespace clang {
 namespace format {

 class ScopedDeclarationState {
 public:
   ScopedDeclarationState(UnwrappedLine &Line, std::vector<bool> &Stack,
                          bool MustBeDeclaration)
       : Line(Line), Stack(Stack) {
     Line.MustBeDeclaration = MustBeDeclaration;
     Stack.push_back(MustBeDeclaration);
   }
   ~ScopedDeclarationState() {
     Stack.pop_back();
     if (!Stack.empty())
       Line.MustBeDeclaration = Stack.back();
     else
       Line.MustBeDeclaration = true;
   }
 private:
   UnwrappedLine &Line;
   std::vector<bool> &Stack;
 };

 class ScopedMacroState : public FormatTokenSource {
 public:
   ScopedMacroState(UnwrappedLine &Line, FormatTokenSource *&TokenSource,
                    FormatToken &ResetToken)
       : Line(Line), TokenSource(TokenSource), ResetToken(ResetToken),
         PreviousLineLevel(Line.Level), PreviousTokenSource(TokenSource) {
     TokenSource = this;
     Line.Level = 0;
     Line.InPPDirective = true;
   }

   ~ScopedMacroState() {
     TokenSource = PreviousTokenSource;
     ResetToken = Token;
     Line.InPPDirective = false;
     Line.Level = PreviousLineLevel;
   }

   virtual FormatToken getNextToken() {
     // The \c UnwrappedLineParser guards against this by never calling
     // \c getNextToken() after it has encountered the first eof token.
     assert(!eof());
     Token = PreviousTokenSource->getNextToken();
     if (eof())
       return createEOF();
     return Token;
   }

 private:
   bool eof() { return Token.NewlinesBefore > 0 && Token.HasUnescapedNewline; }

   FormatToken createEOF() {
     FormatToken FormatTok;
     FormatTok.Tok.startToken();
     FormatTok.Tok.setKind(tok::eof);
     return FormatTok;
   }

   UnwrappedLine &Line;
   FormatTokenSource *&TokenSource;
   FormatToken &ResetToken;
   unsigned PreviousLineLevel;
   FormatTokenSource *PreviousTokenSource;

   FormatToken Token;
 };

 class ScopedLineState {
 public:
   ScopedLineState(UnwrappedLineParser &Parser,
                   bool SwitchToPreprocessorLines = false)
       : Parser(Parser), SwitchToPreprocessorLines(SwitchToPreprocessorLines) {
     if (SwitchToPreprocessorLines)
       Parser.CurrentLines = &Parser.PreprocessorDirectives;
     PreBlockLine = Parser.Line.take();
     Parser.Line.reset(new UnwrappedLine());
     Parser.Line->Level = PreBlockLine->Level;
     Parser.Line->InPPDirective = PreBlockLine->InPPDirective;
   }

   ~ScopedLineState() {
     if (!Parser.Line->Tokens.empty()) {
       Parser.addUnwrappedLine();
     }
     assert(Parser.Line->Tokens.empty());
     Parser.Line.reset(PreBlockLine);
     Parser.MustBreakBeforeNextToken = true;
     if (SwitchToPreprocessorLines)
       Parser.CurrentLines = &Parser.Lines;
   }

 private:
   UnwrappedLineParser &Parser;
   const bool SwitchToPreprocessorLines;

   UnwrappedLine *PreBlockLine;
 };

 UnwrappedLineParser::UnwrappedLineParser(
     clang::DiagnosticsEngine &Diag, const FormatStyle &Style,
     FormatTokenSource &Tokens, UnwrappedLineConsumer &Callback)
     : Line(new UnwrappedLine), MustBreakBeforeNextToken(false),
       CurrentLines(&Lines), Diag(Diag), Style(Style), Tokens(&Tokens),
       Callback(Callback) {}

 bool UnwrappedLineParser::parse() {
   DEBUG(llvm::dbgs() << "----\n");
   readToken();
   bool Error = parseFile();
   for (std::vector<UnwrappedLine>::iterator I = Lines.begin(), E = Lines.end();
        I != E; ++I) {
     Callback.consumeUnwrappedLine(*I);
   }

   // Create line with eof token.
   pushToken(FormatTok);
   Callback.consumeUnwrappedLine(*Line);

   return Error;
 }

 bool UnwrappedLineParser::parseFile() {
   ScopedDeclarationState DeclarationState(
       *Line, DeclarationScopeStack,
       /*MustBeDeclaration=*/ !Line->InPPDirective);
   bool Error = parseLevel(/*HasOpeningBrace=*/ false);
   // Make sure to format the remaining tokens.
   flushComments(true);
   addUnwrappedLine();
   return Error;
 }

 bool UnwrappedLineParser::parseLevel(bool HasOpeningBrace) {
   bool Error = false;
   do {
     switch (FormatTok.Tok.getKind()) {
     case tok::comment:
       nextToken();
       addUnwrappedLine();
       break;
     case tok::l_brace:
       // FIXME: Add parameter whether this can happen - if this happens, we must
       // be in a non-declaration context.
       Error |= parseBlock(/*MustBeDeclaration=*/ false);
       addUnwrappedLine();
       break;
     case tok::r_brace:
       if (HasOpeningBrace) {
         return false;
       } else {
         Diag.Report(FormatTok.Tok.getLocation(),
                     Diag.getCustomDiagID(clang::DiagnosticsEngine::Error,
                                          "unexpected '}'"));
         Error = true;
         nextToken();
         addUnwrappedLine();
       }
       break;
     default:
       parseStructuralElement();
       break;
     }
   } while (!eof());
   return Error;
 }

 bool UnwrappedLineParser::parseBlock(bool MustBeDeclaration,
                                      unsigned AddLevels) {
   assert(FormatTok.Tok.is(tok::l_brace) && "'{' expected");
   nextToken();

   addUnwrappedLine();

   ScopedDeclarationState DeclarationState(*Line, DeclarationScopeStack,
                                           MustBeDeclaration);
   Line->Level += AddLevels;
   parseLevel(/*HasOpeningBrace=*/ true);

   if (!FormatTok.Tok.is(tok::r_brace)) {
     Line->Level -= AddLevels;
     return true;
   }

   nextToken(); // Munch the closing brace.
   Line->Level -= AddLevels;
   return false;
 }

 void UnwrappedLineParser::parsePPDirective() {
   assert(FormatTok.Tok.is(tok::hash) && "'#' expected");
   ScopedMacroState MacroState(*Line, Tokens, FormatTok);
   nextToken();

   if (FormatTok.Tok.getIdentifierInfo() == NULL) {
     parsePPUnknown();
     return;
   }

   switch (FormatTok.Tok.getIdentifierInfo()->getPPKeywordID()) {
   case tok::pp_define:
     parsePPDefine();
     break;
   default:
     parsePPUnknown();
     break;
   }
 }

 void UnwrappedLineParser::parsePPDefine() {
   nextToken();

   if (FormatTok.Tok.getKind() != tok::identifier) {
     parsePPUnknown();
     return;
   }
   nextToken();
   if (FormatTok.Tok.getKind() == tok::l_paren &&
       FormatTok.WhiteSpaceLength == 0) {
     parseParens();
   }
   addUnwrappedLine();
   Line->Level = 1;

   // Errors during a preprocessor directive can only affect the layout of the
   // preprocessor directive, and thus we ignore them. An alternative approach
   // would be to use the same approach we use on the file level (no
   // re-indentation if there was a structural error) within the macro
   // definition.
   parseFile();
 }

 void UnwrappedLineParser::parsePPUnknown() {
   do {
     nextToken();
   } while (!eof());
   addUnwrappedLine();
 }

 void UnwrappedLineParser::parseStructuralElement() {
   assert(!FormatTok.Tok.is(tok::l_brace));
   int TokenNumber = 0;
   switch (FormatTok.Tok.getKind()) {
   case tok::at:
     nextToken();
     if (FormatTok.Tok.is(tok::l_brace)) {
       parseBracedList();
       break;
     }
     switch (FormatTok.Tok.getObjCKeywordID()) {
     case tok::objc_public:
     case tok::objc_protected:
     case tok::objc_package:
     case tok::objc_private:
       return parseAccessSpecifier();
     case tok::objc_interface:
     case tok::objc_implementation:
       return parseObjCInterfaceOrImplementation();
     case tok::objc_protocol:
       return parseObjCProtocol();
     case tok::objc_end:
       return; // Handled by the caller.
     case tok::objc_optional:
     case tok::objc_required:
       nextToken();
       addUnwrappedLine();
       return;
     default:
       break;
     }
     break;
   case tok::kw_namespace:
     parseNamespace();
     return;
   case tok::kw_inline:
     nextToken();
     TokenNumber++;
     if (FormatTok.Tok.is(tok::kw_namespace)) {
       parseNamespace();
       return;
     }
     break;
   case tok::kw_public:
   case tok::kw_protected:
   case tok::kw_private:
     parseAccessSpecifier();
     return;
   case tok::kw_if:
     parseIfThenElse();
     return;
   case tok::kw_for:
   case tok::kw_while:
     parseForOrWhileLoop();
     return;
   case tok::kw_do:
     parseDoWhile();
     return;
   case tok::kw_switch:
     parseSwitch();
     return;
   case tok::kw_default:
     nextToken();
     parseLabel();
     return;
   case tok::kw_case:
     parseCaseLabel();
     return;
   case tok::kw_return:
     parseReturn();
     return;
   case tok::kw_extern:
     nextToken();
     if (FormatTok.Tok.is(tok::string_literal)) {
       nextToken();
       if (FormatTok.Tok.is(tok::l_brace)) {
         parseBlock(/*MustBeDeclaration=*/ true, 0);
         addUnwrappedLine();
         return;
       }
     }
     // In all other cases, parse the declaration.
     break;
   default:
     break;
   }
   do {
     ++TokenNumber;
     switch (FormatTok.Tok.getKind()) {
     case tok::at:
       nextToken();
       if (FormatTok.Tok.is(tok::l_brace))
         parseBracedList();
       break;
     case tok::kw_enum:
       parseEnum();
       break;
     case tok::kw_struct:
     case tok::kw_union:
     case tok::kw_class:
       parseRecord();
       // A record declaration or definition is always the start of a structural
       // element.
       break;
     case tok::semi:
       nextToken();
       addUnwrappedLine();
       return;
     case tok::r_brace:
       addUnwrappedLine();
       return;
     case tok::l_paren:
       parseParens();
       break;
     case tok::l_brace:
       // A block outside of parentheses must be the last part of a
       // structural element.
       // FIXME: Figure out cases where this is not true, and add projections for
       // them (the one we know is missing are lambdas).
       parseBlock(/*MustBeDeclaration=*/ false);
       addUnwrappedLine();
       return;
     case tok::identifier:
       nextToken();
       if (TokenNumber == 1 && FormatTok.Tok.is(tok::colon)) {
         parseLabel();
         return;
       }
       break;
     case tok::equal:
       nextToken();
       if (FormatTok.Tok.is(tok::l_brace)) {
         parseBracedList();
       }
       break;
     default:
       nextToken();
       break;
     }
   } while (!eof());
 }

 void UnwrappedLineParser::parseBracedList() {
   nextToken();

   do {
     switch (FormatTok.Tok.getKind()) {
     case tok::l_brace:
       parseBracedList();
       break;
     case tok::r_brace:
       nextToken();
       return;
     default:
       nextToken();
       break;
     }
   } while (!eof());
 }

 void UnwrappedLineParser::parseReturn() {
   nextToken();

   do {
     switch (FormatTok.Tok.getKind()) {
     case tok::l_brace:
       parseBracedList();
       break;
     case tok::l_paren:
       parseParens();
       break;
     case tok::r_brace:
       // Assume missing ';'.
       addUnwrappedLine();
       return;
     case tok::semi:
       nextToken();
       addUnwrappedLine();
       return;
     default:
       nextToken();
       break;
     }
   } while (!eof());
 }

 void UnwrappedLineParser::parseParens() {
   assert(FormatTok.Tok.is(tok::l_paren) && "'(' expected.");
   nextToken();
   do {
     switch (FormatTok.Tok.getKind()) {
     case tok::l_paren:
       parseParens();
       break;
     case tok::r_paren:
       nextToken();
       return;
     case tok::l_brace: {
       nextToken();
       ScopedLineState LineState(*this);
       ScopedDeclarationState DeclarationState(*Line, DeclarationScopeStack,
                                               /*MustBeDeclaration=*/ false);
       Line->Level += 1;
       parseLevel(/*HasOpeningBrace=*/ true);
       Line->Level -= 1;
       break;
     }
     case tok::at:
       nextToken();
       if (FormatTok.Tok.is(tok::l_brace))
         parseBracedList();
       break;
     default:
       nextToken();
       break;
     }
   } while (!eof());
 }

 void UnwrappedLineParser::parseIfThenElse() {
   assert(FormatTok.Tok.is(tok::kw_if) && "'if' expected");
   nextToken();
   if (FormatTok.Tok.is(tok::l_paren))
     parseParens();
   bool NeedsUnwrappedLine = false;
   if (FormatTok.Tok.is(tok::l_brace)) {
     parseBlock(/*MustBeDeclaration=*/ false);
     NeedsUnwrappedLine = true;
   } else {
     addUnwrappedLine();
     ++Line->Level;
     parseStructuralElement();
     --Line->Level;
   }
   if (FormatTok.Tok.is(tok::kw_else)) {
     nextToken();
     if (FormatTok.Tok.is(tok::l_brace)) {
       parseBlock(/*MustBeDeclaration=*/ false);
       addUnwrappedLine();
     } else if (FormatTok.Tok.is(tok::kw_if)) {
       parseIfThenElse();
     } else {
       addUnwrappedLine();
       ++Line->Level;
       parseStructuralElement();
       --Line->Level;
     }
   } else if (NeedsUnwrappedLine) {
     addUnwrappedLine();
   }
 }

 void UnwrappedLineParser::parseNamespace() {
   assert(FormatTok.Tok.is(tok::kw_namespace) && "'namespace' expected");
   nextToken();
   if (FormatTok.Tok.is(tok::identifier))
     nextToken();
   if (FormatTok.Tok.is(tok::l_brace)) {
     parseBlock(/*MustBeDeclaration=*/ true, 0);
     // Munch the semicolon after a namespace. This is more common than one would
     // think. Puttin the semicolon into its own line is very ugly.
     if (FormatTok.Tok.is(tok::semi))
       nextToken();
     addUnwrappedLine();
   }
   // FIXME: Add error handling.
 }

 void UnwrappedLineParser::parseForOrWhileLoop() {
   assert((FormatTok.Tok.is(tok::kw_for) || FormatTok.Tok.is(tok::kw_while)) &&
          "'for' or 'while' expected");
   nextToken();
   if (FormatTok.Tok.is(tok::l_paren))
     parseParens();
   if (FormatTok.Tok.is(tok::l_brace)) {
     parseBlock(/*MustBeDeclaration=*/ false);
     addUnwrappedLine();
   } else {
     addUnwrappedLine();
     ++Line->Level;
     parseStructuralElement();
     --Line->Level;
   }
 }

 void UnwrappedLineParser::parseDoWhile() {
   assert(FormatTok.Tok.is(tok::kw_do) && "'do' expected");
   nextToken();
   if (FormatTok.Tok.is(tok::l_brace)) {
     parseBlock(/*MustBeDeclaration=*/ false);
   } else {
     addUnwrappedLine();
     ++Line->Level;
     parseStructuralElement();
     --Line->Level;
   }

   // FIXME: Add error handling.
   if (!FormatTok.Tok.is(tok::kw_while)) {
     addUnwrappedLine();
     return;
   }

   nextToken();
   parseStructuralElement();
 }

 void UnwrappedLineParser::parseLabel() {
   if (FormatTok.Tok.isNot(tok::colon))
     return;
   nextToken();
   unsigned OldLineLevel = Line->Level;
   if (Line->Level > 1 || (!Line->InPPDirective && Line->Level > 0))
     --Line->Level;
   if (CommentsBeforeNextToken.empty() && FormatTok.Tok.is(tok::l_brace)) {
     parseBlock(/*MustBeDeclaration=*/ false);
     if (FormatTok.Tok.is(tok::kw_break))
       parseStructuralElement(); // "break;" after "}" goes on the same line.
   }
   addUnwrappedLine();
   Line->Level = OldLineLevel;
 }

 void UnwrappedLineParser::parseCaseLabel() {
   assert(FormatTok.Tok.is(tok::kw_case) && "'case' expected");
   // FIXME: fix handling of complex expressions here.
   do {
     nextToken();
   } while (!eof() && !FormatTok.Tok.is(tok::colon));
   parseLabel();
 }

 void UnwrappedLineParser::parseSwitch() {
   assert(FormatTok.Tok.is(tok::kw_switch) && "'switch' expected");
   nextToken();
   if (FormatTok.Tok.is(tok::l_paren))
     parseParens();
   if (FormatTok.Tok.is(tok::l_brace)) {
     parseBlock(/*MustBeDeclaration=*/ false, Style.IndentCaseLabels ? 2 : 1);
     addUnwrappedLine();
   } else {
     addUnwrappedLine();
     Line->Level += (Style.IndentCaseLabels ? 2 : 1);
     parseStructuralElement();
     Line->Level -= (Style.IndentCaseLabels ? 2 : 1);
   }
 }

 void UnwrappedLineParser::parseAccessSpecifier() {
   nextToken();
   // Otherwise, we don't know what it is, and we'd better keep the next token.
   if (FormatTok.Tok.is(tok::colon))
     nextToken();
   addUnwrappedLine();
 }

 void UnwrappedLineParser::parseEnum() {
   nextToken();
   if (FormatTok.Tok.is(tok::identifier) ||
       FormatTok.Tok.is(tok::kw___attribute) ||
       FormatTok.Tok.is(tok::kw___declspec)) {
     nextToken();
     // We can have macros or attributes in between 'enum' and the enum name.
     if (FormatTok.Tok.is(tok::l_paren)) {
       parseParens();
     }
     if (FormatTok.Tok.is(tok::identifier))
       nextToken();
   }
   if (FormatTok.Tok.is(tok::l_brace)) {
     nextToken();
     addUnwrappedLine();
     ++Line->Level;
     do {
       switch (FormatTok.Tok.getKind()) {
       case tok::l_paren:
         parseParens();
         break;
       case tok::r_brace:
         addUnwrappedLine();
         nextToken();
         --Line->Level;
         return;
       case tok::comma:
         nextToken();
         addUnwrappedLine();
         break;
       default:
         nextToken();
         break;
       }
     } while (!eof());
   }
   // We fall through to parsing a structural element afterwards, so that in
   // enum A {} n, m;
   // "} n, m;" will end up in one unwrapped line.
 }

 void UnwrappedLineParser::parseRecord() {
   nextToken();
   if (FormatTok.Tok.is(tok::identifier) ||
       FormatTok.Tok.is(tok::kw___attribute) ||
       FormatTok.Tok.is(tok::kw___declspec)) {
     nextToken();
     // We can have macros or attributes in between 'class' and the class name.
     if (FormatTok.Tok.is(tok::l_paren)) {
       parseParens();
     }
     // The actual identifier can be a nested name specifier, and in macros
     // it is often token-pasted.
     while (FormatTok.Tok.is(tok::identifier) ||
            FormatTok.Tok.is(tok::coloncolon) || FormatTok.Tok.is(tok::hashhash))
       nextToken();

     // Note that parsing away template declarations here leads to incorrectly
     // accepting function declarations as record declarations.
     // In general, we cannot solve this problem. Consider:
     // class A<int> B() {}
     // which can be a function definition or a class definition when B() is a
     // macro. If we find enough real-world cases where this is a problem, we
     // can parse for the 'template' keyword in the beginning of the statement,
     // and thus rule out the record production in case there is no template
     // (this would still leave us with an ambiguity between template function
     // and class declarations).
     if (FormatTok.Tok.is(tok::colon) || FormatTok.Tok.is(tok::less)) {
       while (!eof() && FormatTok.Tok.isNot(tok::l_brace)) {
         if (FormatTok.Tok.is(tok::semi))
           return;
         nextToken();
       }
     }
   }
   if (FormatTok.Tok.is(tok::l_brace))
     parseBlock(/*MustBeDeclaration=*/ true);
   // We fall through to parsing a structural element afterwards, so
   // class A {} n, m;
   // will end up in one unwrapped line.
 }

 void UnwrappedLineParser::parseObjCProtocolList() {
   assert(FormatTok.Tok.is(tok::less) && "'<' expected.");
   do
     nextToken();
   while (!eof() && FormatTok.Tok.isNot(tok::greater));
   nextToken(); // Skip '>'.
 }

 void UnwrappedLineParser::parseObjCUntilAtEnd() {
   do {
     if (FormatTok.Tok.isObjCAtKeyword(tok::objc_end)) {
       nextToken();
       addUnwrappedLine();
       break;
     }
     parseStructuralElement();
   } while (!eof());
 }

 void UnwrappedLineParser::parseObjCInterfaceOrImplementation() {
   nextToken();
   nextToken(); // interface name

   // @interface can be followed by either a base class, or a category.
   if (FormatTok.Tok.is(tok::colon)) {
     nextToken();
     nextToken(); // base class name
   } else if (FormatTok.Tok.is(tok::l_paren))
     // Skip category, if present.
     parseParens();

   if (FormatTok.Tok.is(tok::less))
     parseObjCProtocolList();

   // If instance variables are present, keep the '{' on the first line too.
   if (FormatTok.Tok.is(tok::l_brace))
     parseBlock(/*MustBeDeclaration=*/ true);

   // With instance variables, this puts '}' on its own line.  Without instance
   // variables, this ends the @interface line.
   addUnwrappedLine();

   parseObjCUntilAtEnd();
 }

 void UnwrappedLineParser::parseObjCProtocol() {
   nextToken();
   nextToken(); // protocol name

   if (FormatTok.Tok.is(tok::less))
     parseObjCProtocolList();

   // Check for protocol declaration.
   if (FormatTok.Tok.is(tok::semi)) {
     nextToken();
     return addUnwrappedLine();
   }

   addUnwrappedLine();
   parseObjCUntilAtEnd();
 }

 void UnwrappedLineParser::addUnwrappedLine() {
   if (Line->Tokens.empty())
     return;
   DEBUG({
     llvm::dbgs() << "Line(" << Line->Level << ")"
                  << (Line->InPPDirective ? " MACRO" : "") << ": ";
     for (std::list<FormatToken>::iterator I = Line->Tokens.begin(),
                                           E = Line->Tokens.end();
          I != E; ++I) {
       llvm::dbgs() << I->Tok.getName() << " ";

     }
     llvm::dbgs() << "\n";
   });
   CurrentLines->push_back(*Line);
   Line->Tokens.clear();
   if (CurrentLines == &Lines && !PreprocessorDirectives.empty()) {
     for (std::vector<UnwrappedLine>::iterator
              I = PreprocessorDirectives.begin(),
              E = PreprocessorDirectives.end();
          I != E; ++I) {
       CurrentLines->push_back(*I);
     }
     PreprocessorDirectives.clear();
   }
 }

 bool UnwrappedLineParser::eof() const { return FormatTok.Tok.is(tok::eof); }

 void UnwrappedLineParser::flushComments(bool NewlineBeforeNext) {
   bool JustComments = Line->Tokens.empty();
   for (SmallVectorImpl<FormatToken>::const_iterator
            I = CommentsBeforeNextToken.begin(),
            E = CommentsBeforeNextToken.end();
        I != E; ++I) {
     if (I->NewlinesBefore && JustComments) {
       addUnwrappedLine();
     }
     pushToken(*I);
   }
   if (NewlineBeforeNext && JustComments) {
     addUnwrappedLine();
   }
   CommentsBeforeNextToken.clear();
 }

 void UnwrappedLineParser::nextToken() {
   if (eof())
     return;
   flushComments(FormatTok.NewlinesBefore > 0);
   pushToken(FormatTok);
   readToken();
 }

 void UnwrappedLineParser::readToken() {
   bool CommentsInCurrentLine = true;
   do {
     FormatTok = Tokens->getNextToken();
     while (!Line->InPPDirective && FormatTok.Tok.is(tok::hash) &&
            ((FormatTok.NewlinesBefore > 0 && FormatTok.HasUnescapedNewline) ||
             FormatTok.IsFirst)) {
       flushComments(FormatTok.NewlinesBefore > 0);
       // If there is an unfinished unwrapped line, we flush the preprocessor
       // directives only after that unwrapped line was finished later.
       bool SwitchToPreprocessorLines =
           !Line->Tokens.empty() && CurrentLines == &Lines;
       ScopedLineState BlockState(*this, SwitchToPreprocessorLines);
       parsePPDirective();
     }
     if (!FormatTok.Tok.is(tok::comment))
       return;
     if (FormatTok.NewlinesBefore > 0 || FormatTok.IsFirst) {
       CommentsInCurrentLine = false;
     }
     if (CommentsInCurrentLine) {
       pushToken(FormatTok);
     } else {
       CommentsBeforeNextToken.push_back(FormatTok);
     }
   } while (!eof());
 }

 void UnwrappedLineParser::pushToken(const FormatToken &Tok) {
   Line->Tokens.push_back(Tok);
   if (MustBreakBeforeNextToken) {
     Line->Tokens.back().MustBreakBefore = true;
     MustBreakBeforeNextToken = false;
   }
 }

 } // end namespace format
 } // end namespace clang
	//===--- UnwrappedLineParser.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 contains the implementation of the UnwrappedLineParser,
	/// which turns a stream of tokens into UnwrappedLines.
	///
	//===----------------------------------------------------------------------===//

	#define DEBUG_TYPE "format-parser"

	#include "UnwrappedLineParser.h"
	#include "clang/Basic/Diagnostic.h"
	#include "llvm/Support/Debug.h"

	namespace clang {
	namespace format {

	class ScopedDeclarationState {
	public:
	ScopedDeclarationState(UnwrappedLine &Line, std::vector<bool> &Stack,
	bool MustBeDeclaration)
	: Line(Line), Stack(Stack) {
	Line.MustBeDeclaration = MustBeDeclaration;
	Stack.push_back(MustBeDeclaration);
	}
	~ScopedDeclarationState() {
	Stack.pop_back();
	if (!Stack.empty())
	Line.MustBeDeclaration = Stack.back();
	else
	Line.MustBeDeclaration = true;
	}
	private:
	UnwrappedLine &Line;
	std::vector<bool> &Stack;
	};

	class ScopedMacroState : public FormatTokenSource {
	public:
	ScopedMacroState(UnwrappedLine &Line, FormatTokenSource *&TokenSource,
	FormatToken &ResetToken)
	: Line(Line), TokenSource(TokenSource), ResetToken(ResetToken),
	PreviousLineLevel(Line.Level), PreviousTokenSource(TokenSource) {
	TokenSource = this;
	Line.Level = 0;
	Line.InPPDirective = true;
	}

	~ScopedMacroState() {
	TokenSource = PreviousTokenSource;
	ResetToken = Token;
	Line.InPPDirective = false;
	Line.Level = PreviousLineLevel;
	}

	virtual FormatToken getNextToken() {
	// The \c UnwrappedLineParser guards against this by never calling
	// \c getNextToken() after it has encountered the first eof token.
	assert(!eof());
	Token = PreviousTokenSource->getNextToken();
	if (eof())
	return createEOF();
	return Token;
	}

	private:
	bool eof() { return Token.NewlinesBefore > 0 && Token.HasUnescapedNewline; }

	FormatToken createEOF() {
	FormatToken FormatTok;
	FormatTok.Tok.startToken();
	FormatTok.Tok.setKind(tok::eof);
	return FormatTok;
	}

	UnwrappedLine &Line;
	FormatTokenSource *&TokenSource;
	FormatToken &ResetToken;
	unsigned PreviousLineLevel;
	FormatTokenSource *PreviousTokenSource;

	FormatToken Token;
	};

	class ScopedLineState {
	public:
	ScopedLineState(UnwrappedLineParser &Parser,
	bool SwitchToPreprocessorLines = false)
	: Parser(Parser), SwitchToPreprocessorLines(SwitchToPreprocessorLines) {
	if (SwitchToPreprocessorLines)
	Parser.CurrentLines = &Parser.PreprocessorDirectives;
	PreBlockLine = Parser.Line.take();
	Parser.Line.reset(new UnwrappedLine());
	Parser.Line->Level = PreBlockLine->Level;
	Parser.Line->InPPDirective = PreBlockLine->InPPDirective;
	}

	~ScopedLineState() {
	if (!Parser.Line->Tokens.empty()) {
	Parser.addUnwrappedLine();
	}
	assert(Parser.Line->Tokens.empty());
	Parser.Line.reset(PreBlockLine);
	Parser.MustBreakBeforeNextToken = true;
	if (SwitchToPreprocessorLines)
	Parser.CurrentLines = &Parser.Lines;
	}

	private:
	UnwrappedLineParser &Parser;
	const bool SwitchToPreprocessorLines;

	UnwrappedLine *PreBlockLine;
	};

	UnwrappedLineParser::UnwrappedLineParser(
	clang::DiagnosticsEngine &Diag, const FormatStyle &Style,
	FormatTokenSource &Tokens, UnwrappedLineConsumer &Callback)
	: Line(new UnwrappedLine), MustBreakBeforeNextToken(false),
	CurrentLines(&Lines), Diag(Diag), Style(Style), Tokens(&Tokens),
	Callback(Callback) {}

	bool UnwrappedLineParser::parse() {
	DEBUG(llvm::dbgs() << "----\n");
	readToken();
	bool Error = parseFile();
	for (std::vector<UnwrappedLine>::iterator I = Lines.begin(), E = Lines.end();
	I != E; ++I) {
	Callback.consumeUnwrappedLine(*I);
	}

	// Create line with eof token.
	pushToken(FormatTok);
	Callback.consumeUnwrappedLine(*Line);

	return Error;
	}

	bool UnwrappedLineParser::parseFile() {
	ScopedDeclarationState DeclarationState(
	*Line, DeclarationScopeStack,
	/MustBeDeclaration=/ !Line->InPPDirective);
	bool Error = parseLevel(/HasOpeningBrace=/ false);
	// Make sure to format the remaining tokens.
	flushComments(true);
	addUnwrappedLine();
	return Error;
	}

	bool UnwrappedLineParser::parseLevel(bool HasOpeningBrace) {
	bool Error = false;
	do {
	switch (FormatTok.Tok.getKind()) {
	case tok::comment:
	nextToken();
	addUnwrappedLine();
	break;
	case tok::l_brace:
	// FIXME: Add parameter whether this can happen - if this happens, we must
	// be in a non-declaration context.
	Error \|= parseBlock(/MustBeDeclaration=/ false);
	addUnwrappedLine();
	break;
	case tok::r_brace:
	if (HasOpeningBrace) {
	return false;
	} else {
	Diag.Report(FormatTok.Tok.getLocation(),
	Diag.getCustomDiagID(clang::DiagnosticsEngine::Error,
	"unexpected '}'"));
	Error = true;
	nextToken();
	addUnwrappedLine();
	}
	break;
	default:
	parseStructuralElement();
	break;
	}
	} while (!eof());
	return Error;
	}

	bool UnwrappedLineParser::parseBlock(bool MustBeDeclaration,
	unsigned AddLevels) {
	assert(FormatTok.Tok.is(tok::l_brace) && "'{' expected");
	nextToken();

	addUnwrappedLine();

	ScopedDeclarationState DeclarationState(*Line, DeclarationScopeStack,
	MustBeDeclaration);
	Line->Level += AddLevels;
	parseLevel(/HasOpeningBrace=/ true);

	if (!FormatTok.Tok.is(tok::r_brace)) {
	Line->Level -= AddLevels;
	return true;
	}

	nextToken(); // Munch the closing brace.
	Line->Level -= AddLevels;
	return false;
	}

	void UnwrappedLineParser::parsePPDirective() {
	assert(FormatTok.Tok.is(tok::hash) && "'#' expected");
	ScopedMacroState MacroState(*Line, Tokens, FormatTok);
	nextToken();

	if (FormatTok.Tok.getIdentifierInfo() == NULL) {
	parsePPUnknown();
	return;
	}

	switch (FormatTok.Tok.getIdentifierInfo()->getPPKeywordID()) {
	case tok::pp_define:
	parsePPDefine();
	break;
	default:
	parsePPUnknown();
	break;
	}
	}

	void UnwrappedLineParser::parsePPDefine() {
	nextToken();

	if (FormatTok.Tok.getKind() != tok::identifier) {
	parsePPUnknown();
	return;
	}
	nextToken();
	if (FormatTok.Tok.getKind() == tok::l_paren &&
	FormatTok.WhiteSpaceLength == 0) {
	parseParens();
	}
	addUnwrappedLine();
	Line->Level = 1;

	// Errors during a preprocessor directive can only affect the layout of the
	// preprocessor directive, and thus we ignore them. An alternative approach
	// would be to use the same approach we use on the file level (no
	// re-indentation if there was a structural error) within the macro
	// definition.
	parseFile();
	}

	void UnwrappedLineParser::parsePPUnknown() {
	do {
	nextToken();
	} while (!eof());
	addUnwrappedLine();
	}

	void UnwrappedLineParser::parseStructuralElement() {
	assert(!FormatTok.Tok.is(tok::l_brace));
	int TokenNumber = 0;
	switch (FormatTok.Tok.getKind()) {
	case tok::at:
	nextToken();
	if (FormatTok.Tok.is(tok::l_brace)) {
	parseBracedList();
	break;
	}
	switch (FormatTok.Tok.getObjCKeywordID()) {
	case tok::objc_public:
	case tok::objc_protected:
	case tok::objc_package:
	case tok::objc_private:
	return parseAccessSpecifier();
	case tok::objc_interface:
	case tok::objc_implementation:
	return parseObjCInterfaceOrImplementation();
	case tok::objc_protocol:
	return parseObjCProtocol();
	case tok::objc_end:
	return; // Handled by the caller.
	case tok::objc_optional:
	case tok::objc_required:
	nextToken();
	addUnwrappedLine();
	return;
	default:
	break;
	}
	break;
	case tok::kw_namespace:
	parseNamespace();
	return;
	case tok::kw_inline:
	nextToken();
	TokenNumber++;
	if (FormatTok.Tok.is(tok::kw_namespace)) {
	parseNamespace();
	return;
	}
	break;
	case tok::kw_public:
	case tok::kw_protected:
	case tok::kw_private:
	parseAccessSpecifier();
	return;
	case tok::kw_if:
	parseIfThenElse();
	return;
	case tok::kw_for:
	case tok::kw_while:
	parseForOrWhileLoop();
	return;
	case tok::kw_do:
	parseDoWhile();
	return;
	case tok::kw_switch:
	parseSwitch();
	return;
	case tok::kw_default:
	nextToken();
	parseLabel();
	return;
	case tok::kw_case:
	parseCaseLabel();
	return;
	case tok::kw_return:
	parseReturn();
	return;
	case tok::kw_extern:
	nextToken();
	if (FormatTok.Tok.is(tok::string_literal)) {
	nextToken();
	if (FormatTok.Tok.is(tok::l_brace)) {
	parseBlock(/MustBeDeclaration=/ true, 0);
	addUnwrappedLine();
	return;
	}
	}
	// In all other cases, parse the declaration.
	break;
	default:
	break;
	}
	do {
	++TokenNumber;
	switch (FormatTok.Tok.getKind()) {
	case tok::at:
	nextToken();
	if (FormatTok.Tok.is(tok::l_brace))
	parseBracedList();
	break;
	case tok::kw_enum:
	parseEnum();
	break;
	case tok::kw_struct:
	case tok::kw_union:
	case tok::kw_class:
	parseRecord();
	// A record declaration or definition is always the start of a structural
	// element.
	break;
	case tok::semi:
	nextToken();
	addUnwrappedLine();
	return;
	case tok::r_brace:
	addUnwrappedLine();
	return;
	case tok::l_paren:
	parseParens();
	break;
	case tok::l_brace:
	// A block outside of parentheses must be the last part of a
	// structural element.
	// FIXME: Figure out cases where this is not true, and add projections for
	// them (the one we know is missing are lambdas).
	parseBlock(/MustBeDeclaration=/ false);
	addUnwrappedLine();
	return;
	case tok::identifier:
	nextToken();
	if (TokenNumber == 1 && FormatTok.Tok.is(tok::colon)) {
	parseLabel();
	return;
	}
	break;
	case tok::equal:
	nextToken();
	if (FormatTok.Tok.is(tok::l_brace)) {
	parseBracedList();
	}
	break;
	default:
	nextToken();
	break;
	}
	} while (!eof());
	}

	void UnwrappedLineParser::parseBracedList() {
	nextToken();

	do {
	switch (FormatTok.Tok.getKind()) {
	case tok::l_brace:
	parseBracedList();
	break;
	case tok::r_brace:
	nextToken();
	return;
	default:
	nextToken();
	break;
	}
	} while (!eof());
	}

	void UnwrappedLineParser::parseReturn() {
	nextToken();

	do {
	switch (FormatTok.Tok.getKind()) {
	case tok::l_brace:
	parseBracedList();
	break;
	case tok::l_paren:
	parseParens();
	break;
	case tok::r_brace:
	// Assume missing ';'.
	addUnwrappedLine();
	return;
	case tok::semi:
	nextToken();
	addUnwrappedLine();
	return;
	default:
	nextToken();
	break;
	}
	} while (!eof());
	}

	void UnwrappedLineParser::parseParens() {
	assert(FormatTok.Tok.is(tok::l_paren) && "'(' expected.");
	nextToken();
	do {
	switch (FormatTok.Tok.getKind()) {
	case tok::l_paren:
	parseParens();
	break;
	case tok::r_paren:
	nextToken();
	return;
	case tok::l_brace: {
	nextToken();
	ScopedLineState LineState(*this);
	ScopedDeclarationState DeclarationState(*Line, DeclarationScopeStack,
	/MustBeDeclaration=/ false);
	Line->Level += 1;
	parseLevel(/HasOpeningBrace=/ true);
	Line->Level -= 1;
	break;
	}
	case tok::at:
	nextToken();
	if (FormatTok.Tok.is(tok::l_brace))
	parseBracedList();
	break;
	default:
	nextToken();
	break;
	}
	} while (!eof());
	}

	void UnwrappedLineParser::parseIfThenElse() {
	assert(FormatTok.Tok.is(tok::kw_if) && "'if' expected");
	nextToken();
	if (FormatTok.Tok.is(tok::l_paren))
	parseParens();
	bool NeedsUnwrappedLine = false;
	if (FormatTok.Tok.is(tok::l_brace)) {
	parseBlock(/MustBeDeclaration=/ false);
	NeedsUnwrappedLine = true;
	} else {
	addUnwrappedLine();
	++Line->Level;
	parseStructuralElement();
	--Line->Level;
	}
	if (FormatTok.Tok.is(tok::kw_else)) {
	nextToken();
	if (FormatTok.Tok.is(tok::l_brace)) {
	parseBlock(/MustBeDeclaration=/ false);
	addUnwrappedLine();
	} else if (FormatTok.Tok.is(tok::kw_if)) {
	parseIfThenElse();
	} else {
	addUnwrappedLine();
	++Line->Level;
	parseStructuralElement();
	--Line->Level;
	}
	} else if (NeedsUnwrappedLine) {
	addUnwrappedLine();
	}
	}

	void UnwrappedLineParser::parseNamespace() {
	assert(FormatTok.Tok.is(tok::kw_namespace) && "'namespace' expected");
	nextToken();
	if (FormatTok.Tok.is(tok::identifier))
	nextToken();
	if (FormatTok.Tok.is(tok::l_brace)) {
	parseBlock(/MustBeDeclaration=/ true, 0);
	// Munch the semicolon after a namespace. This is more common than one would
	// think. Puttin the semicolon into its own line is very ugly.
	if (FormatTok.Tok.is(tok::semi))
	nextToken();
	addUnwrappedLine();
	}
	// FIXME: Add error handling.
	}

	void UnwrappedLineParser::parseForOrWhileLoop() {
	assert((FormatTok.Tok.is(tok::kw_for) \|\| FormatTok.Tok.is(tok::kw_while)) &&
	"'for' or 'while' expected");
	nextToken();
	if (FormatTok.Tok.is(tok::l_paren))
	parseParens();
	if (FormatTok.Tok.is(tok::l_brace)) {
	parseBlock(/MustBeDeclaration=/ false);
	addUnwrappedLine();
	} else {
	addUnwrappedLine();
	++Line->Level;
	parseStructuralElement();
	--Line->Level;
	}
	}

	void UnwrappedLineParser::parseDoWhile() {
	assert(FormatTok.Tok.is(tok::kw_do) && "'do' expected");
	nextToken();
	if (FormatTok.Tok.is(tok::l_brace)) {
	parseBlock(/MustBeDeclaration=/ false);
	} else {
	addUnwrappedLine();
	++Line->Level;
	parseStructuralElement();
	--Line->Level;
	}

	// FIXME: Add error handling.
	if (!FormatTok.Tok.is(tok::kw_while)) {
	addUnwrappedLine();
	return;
	}

	nextToken();
	parseStructuralElement();
	}

	void UnwrappedLineParser::parseLabel() {
	if (FormatTok.Tok.isNot(tok::colon))
	return;
	nextToken();
	unsigned OldLineLevel = Line->Level;
	if (Line->Level > 1 \|\| (!Line->InPPDirective && Line->Level > 0))
	--Line->Level;
	if (CommentsBeforeNextToken.empty() && FormatTok.Tok.is(tok::l_brace)) {
	parseBlock(/MustBeDeclaration=/ false);
	if (FormatTok.Tok.is(tok::kw_break))
	parseStructuralElement(); // "break;" after "}" goes on the same line.
	}
	addUnwrappedLine();
	Line->Level = OldLineLevel;
	}

	void UnwrappedLineParser::parseCaseLabel() {
	assert(FormatTok.Tok.is(tok::kw_case) && "'case' expected");
	// FIXME: fix handling of complex expressions here.
	do {
	nextToken();
	} while (!eof() && !FormatTok.Tok.is(tok::colon));
	parseLabel();
	}

	void UnwrappedLineParser::parseSwitch() {
	assert(FormatTok.Tok.is(tok::kw_switch) && "'switch' expected");
	nextToken();
	if (FormatTok.Tok.is(tok::l_paren))
	parseParens();
	if (FormatTok.Tok.is(tok::l_brace)) {
	parseBlock(/MustBeDeclaration=/ false, Style.IndentCaseLabels ? 2 : 1);
	addUnwrappedLine();
	} else {
	addUnwrappedLine();
	Line->Level += (Style.IndentCaseLabels ? 2 : 1);
	parseStructuralElement();
	Line->Level -= (Style.IndentCaseLabels ? 2 : 1);
	}
	}

	void UnwrappedLineParser::parseAccessSpecifier() {
	nextToken();
	// Otherwise, we don't know what it is, and we'd better keep the next token.
	if (FormatTok.Tok.is(tok::colon))
	nextToken();
	addUnwrappedLine();
	}

	void UnwrappedLineParser::parseEnum() {
	nextToken();
	if (FormatTok.Tok.is(tok::identifier) \|\|
	FormatTok.Tok.is(tok::kw___attribute) \|\|
	FormatTok.Tok.is(tok::kw___declspec)) {
	nextToken();
	// We can have macros or attributes in between 'enum' and the enum name.
	if (FormatTok.Tok.is(tok::l_paren)) {
	parseParens();
	}
	if (FormatTok.Tok.is(tok::identifier))
	nextToken();
	}
	if (FormatTok.Tok.is(tok::l_brace)) {
	nextToken();
	addUnwrappedLine();
	++Line->Level;
	do {
	switch (FormatTok.Tok.getKind()) {
	case tok::l_paren:
	parseParens();
	break;
	case tok::r_brace:
	addUnwrappedLine();
	nextToken();
	--Line->Level;
	return;
	case tok::comma:
	nextToken();
	addUnwrappedLine();
	break;
	default:
	nextToken();
	break;
	}
	} while (!eof());
	}
	// We fall through to parsing a structural element afterwards, so that in
	// enum A {} n, m;
	// "} n, m;" will end up in one unwrapped line.
	}

	void UnwrappedLineParser::parseRecord() {
	nextToken();
	if (FormatTok.Tok.is(tok::identifier) \|\|
	FormatTok.Tok.is(tok::kw___attribute) \|\|
	FormatTok.Tok.is(tok::kw___declspec)) {
	nextToken();
	// We can have macros or attributes in between 'class' and the class name.
	if (FormatTok.Tok.is(tok::l_paren)) {
	parseParens();
	}
	// The actual identifier can be a nested name specifier, and in macros
	// it is often token-pasted.
	while (FormatTok.Tok.is(tok::identifier) \|\|
	FormatTok.Tok.is(tok::coloncolon) \|\| FormatTok.Tok.is(tok::hashhash))
	nextToken();

	// Note that parsing away template declarations here leads to incorrectly
	// accepting function declarations as record declarations.
	// In general, we cannot solve this problem. Consider:
	// class A<int> B() {}
	// which can be a function definition or a class definition when B() is a
	// macro. If we find enough real-world cases where this is a problem, we
	// can parse for the 'template' keyword in the beginning of the statement,
	// and thus rule out the record production in case there is no template
	// (this would still leave us with an ambiguity between template function
	// and class declarations).
	if (FormatTok.Tok.is(tok::colon) \|\| FormatTok.Tok.is(tok::less)) {
	while (!eof() && FormatTok.Tok.isNot(tok::l_brace)) {
	if (FormatTok.Tok.is(tok::semi))
	return;
	nextToken();
	}
	}
	}
	if (FormatTok.Tok.is(tok::l_brace))
	parseBlock(/MustBeDeclaration=/ true);
	// We fall through to parsing a structural element afterwards, so
	// class A {} n, m;
	// will end up in one unwrapped line.
	}

	void UnwrappedLineParser::parseObjCProtocolList() {
	assert(FormatTok.Tok.is(tok::less) && "'<' expected.");
	do
	nextToken();
	while (!eof() && FormatTok.Tok.isNot(tok::greater));
	nextToken(); // Skip '>'.
	}

	void UnwrappedLineParser::parseObjCUntilAtEnd() {
	do {
	if (FormatTok.Tok.isObjCAtKeyword(tok::objc_end)) {
	nextToken();
	addUnwrappedLine();
	break;
	}
	parseStructuralElement();
	} while (!eof());
	}

	void UnwrappedLineParser::parseObjCInterfaceOrImplementation() {
	nextToken();
	nextToken(); // interface name

	// @interface can be followed by either a base class, or a category.
	if (FormatTok.Tok.is(tok::colon)) {
	nextToken();
	nextToken(); // base class name
	} else if (FormatTok.Tok.is(tok::l_paren))
	// Skip category, if present.
	parseParens();

	if (FormatTok.Tok.is(tok::less))
	parseObjCProtocolList();

	// If instance variables are present, keep the '{' on the first line too.
	if (FormatTok.Tok.is(tok::l_brace))
	parseBlock(/MustBeDeclaration=/ true);

	// With instance variables, this puts '}' on its own line. Without instance
	// variables, this ends the @interface line.
	addUnwrappedLine();

	parseObjCUntilAtEnd();
	}

	void UnwrappedLineParser::parseObjCProtocol() {
	nextToken();
	nextToken(); // protocol name

	if (FormatTok.Tok.is(tok::less))
	parseObjCProtocolList();

	// Check for protocol declaration.
	if (FormatTok.Tok.is(tok::semi)) {
	nextToken();
	return addUnwrappedLine();
	}

	addUnwrappedLine();
	parseObjCUntilAtEnd();
	}

	void UnwrappedLineParser::addUnwrappedLine() {
	if (Line->Tokens.empty())
	return;
	DEBUG({
	llvm::dbgs() << "Line(" << Line->Level << ")"
	<< (Line->InPPDirective ? " MACRO" : "") << ": ";
	for (std::list<FormatToken>::iterator I = Line->Tokens.begin(),
	E = Line->Tokens.end();
	I != E; ++I) {
	llvm::dbgs() << I->Tok.getName() << " ";

	}
	llvm::dbgs() << "\n";
	});
	CurrentLines->push_back(*Line);
	Line->Tokens.clear();
	if (CurrentLines == &Lines && !PreprocessorDirectives.empty()) {
	for (std::vector<UnwrappedLine>::iterator
	I = PreprocessorDirectives.begin(),
	E = PreprocessorDirectives.end();
	I != E; ++I) {
	CurrentLines->push_back(*I);
	}
	PreprocessorDirectives.clear();
	}
	}

	bool UnwrappedLineParser::eof() const { return FormatTok.Tok.is(tok::eof); }

	void UnwrappedLineParser::flushComments(bool NewlineBeforeNext) {
	bool JustComments = Line->Tokens.empty();
	for (SmallVectorImpl<FormatToken>::const_iterator
	I = CommentsBeforeNextToken.begin(),
	E = CommentsBeforeNextToken.end();
	I != E; ++I) {
	if (I->NewlinesBefore && JustComments) {
	addUnwrappedLine();
	}
	pushToken(*I);
	}
	if (NewlineBeforeNext && JustComments) {
	addUnwrappedLine();
	}
	CommentsBeforeNextToken.clear();
	}

	void UnwrappedLineParser::nextToken() {
	if (eof())
	return;
	flushComments(FormatTok.NewlinesBefore > 0);
	pushToken(FormatTok);
	readToken();
	}

	void UnwrappedLineParser::readToken() {
	bool CommentsInCurrentLine = true;
	do {
	FormatTok = Tokens->getNextToken();
	while (!Line->InPPDirective && FormatTok.Tok.is(tok::hash) &&
	((FormatTok.NewlinesBefore > 0 && FormatTok.HasUnescapedNewline) \|\|
	FormatTok.IsFirst)) {
	flushComments(FormatTok.NewlinesBefore > 0);
	// If there is an unfinished unwrapped line, we flush the preprocessor
	// directives only after that unwrapped line was finished later.
	bool SwitchToPreprocessorLines =
	!Line->Tokens.empty() && CurrentLines == &Lines;
	ScopedLineState BlockState(*this, SwitchToPreprocessorLines);
	parsePPDirective();
	}
	if (!FormatTok.Tok.is(tok::comment))
	return;
	if (FormatTok.NewlinesBefore > 0 \|\| FormatTok.IsFirst) {
	CommentsInCurrentLine = false;
	}
	if (CommentsInCurrentLine) {
	pushToken(FormatTok);
	} else {
	CommentsBeforeNextToken.push_back(FormatTok);
	}
	} while (!eof());
	}

	void UnwrappedLineParser::pushToken(const FormatToken &Tok) {
	Line->Tokens.push_back(Tok);
	if (MustBreakBeforeNextToken) {
	Line->Tokens.back().MustBreakBefore = true;
	MustBreakBeforeNextToken = false;
	}
	}

	} // end namespace format
	} // end namespace clang