480 struct Piece {  struct
482   Piece(PieceKind Kind) : ClassKind(Kind) {}  in Piece()  argument
483   Piece(Piece const &O) = delete;
484   Piece &operator=(Piece const &) = delete;
485   virtual ~Piece() {}  in ~Piece()  argument
488   static bool classof(const Piece *) { return true; }  in classof()  argument
494 struct MultiPiece : Piece {
495   MultiPiece() : Piece(MultiPieceClass) {}  in MultiPiece()
496   MultiPiece(std::vector<Piece *> Pieces)  in MultiPiece()
497       : Piece(MultiPieceClass), Pieces(std::move(Pieces)) {}  in MultiPiece()
499   std::vector<Piece *> Pieces;
501   static bool classof(const Piece *P) {  in classof()
506 struct TextPiece : Piece {
510       : Piece(TextPieceClass), Role(Role), Text(Text.str()) {}  in TextPiece()
512   static bool classof(const Piece *P) {  in classof()
517 struct PlaceholderPiece : Piece {
521       : Piece(PlaceholderPieceClass), Kind(Kind), Index(Index) {}  in PlaceholderPiece()
523   static bool classof(const Piece *P) {  in classof()
528 struct SelectPiece : Piece {
531       : Piece(Kind), ModKind(ModKind) {}  in SelectPiece()
537   std::vector<Piece *> Options;
540   static bool classof(const Piece *P) {  in classof()
549   std::vector<Piece *> OptionPrefixes;
552   static bool classof(const Piece *P) {  in classof()
557 struct DiffPiece : Piece {
558   DiffPiece() : Piece(DiffPieceClass) {}  in DiffPiece()
560   Piece *Parts[4] = {};
563   static bool classof(const Piece *P) {  in classof()
568 struct SubstitutionPiece : Piece {
569   SubstitutionPiece() : Piece(SubstitutionPieceClass) {}  in SubstitutionPiece()
574   static bool classof(const Piece *P) {  in classof()
610   Piece *getSubstitution(SubstitutionPiece *S) const {  in getSubstitution()
625     std::vector<Piece *> AllocatedPieces;
626     Piece *Root = nullptr;
629       static_assert(std::is_base_of<Piece, T>::value, "must be piece");  in New()
647     Piece *parseDiagText(StringRef &Text, StopAt Stop);
666       for (Piece *P : AllocatedPieces)  in ~DiagText()
721     Piece *Substitution;
727   void Visit(Piece *P) {  in Visit()
731     return getDerived().Visit##T(static_cast<T##Piece *>(P))  in Visit()
805       Piece *OrigP, const ModifierMappingsType &CurrentMappings,  in gatherNodes()
806       std::vector<std::pair<Piece *, ModifierMappingsType>> &Pieces) const {  in gatherNodes()
813       for (Piece *Node : MD->Pieces)  in gatherNodes()
831     std::vector<std::pair<Piece *, ModifierMappingsType>> Pieces;  in VisitMulti()
837     for (const std::pair<Piece *, ModifierMappingsType> &NodePair : Pieces) {  in VisitMulti()
846       // We need a vertical separator if either this or the previous piece is a  in VisitMulti()
847       // multi-line piece, or this is the last piece.  in VisitMulti()
1018 Piece *DiagnosticTextBuilder::DiagText::parseDiagText(StringRef &Text,  in parseDiagText()
1020   std::vector<Piece *> Parsed;  in parseDiagText()
1332     for (StringRef Piece : SelectPieces) {  in verifyDiagnosticWording()  local
1333       if (Piece.empty())  in verifyDiagnosticWording()
1336         DiagnoseStart(Piece);  in verifyDiagnosticWording()
1340       // There was an empty select piece, so we need to check the second  in verifyDiagnosticWording()
1355   // at each piece to see whether it ends in punctuation or not.  in verifyDiagnosticWording()
1389       for (StringRef Piece : SelectPieces) {  in verifyDiagnosticWording()  local
1391         if (!Piece.empty())  in verifyDiagnosticWording()
1392           DiagnoseEnd(Piece);  in verifyDiagnosticWording()