Class Parser

app/src/DataModel/Importers/ProtoImporter.cpp:320–352

* @brief Recursive-descent parser for a small proto3 subset (messages, scalars, nested types). */

 * @brief Recursive-descent parser for a small proto3 subset (messages, scalars, nested types).
 */
class Parser {
public:
  Parser(const QString& src, QString& packageOut, QVector<DataModel::ProtoMessage>& outMessages);

  bool parseFile(ParseError& err);

private:
  bool accept(Tok t);
  bool expect(Tok t, const QString& what, ParseError& err);
  void advance();
  void skipToSemicolon();
  void skipBlock();
  void skipOptionList();

  bool parseMessage(const QString& parentQualified,
                    DataModel::ProtoMessage& out,
                    ParseError& err,
                    int depth);
  bool parseField(DataModel::ProtoMessage& msg, ParseError& err);
  bool parseOneof(DataModel::ProtoMessage& msg, ParseError& err);
  bool parseMap(DataModel::ProtoMessage& msg, ParseError& err);
  bool parseEnumBody(ParseError& err);
  bool parseFieldTag(int& tag, ParseError& err);
  int tryParseMessageBodyKeyword(DataModel::ProtoMessage& out, ParseError& err, int depth);

  static constexpr int kMaxMessageNestingDepth = 64;
  static constexpr int kMaxProtoFieldTag       = 536870911;

  Lexer m_lexer;
  Token m_cur;
  QString& m_packageOut;
  QVector<DataModel::ProtoMessage>& m_messages;
};

/**
 * @brief Constructs the parser over a proto3 source buffer; primes the lookahead token.