dbc_statement_handler.h

// SPDX-License-Identifier: MIT
#ifndef DBC_STATEMENT_HANDLER_H
#define DBC_STATEMENT_HANDLER_H
 
#include "dbc_database.h"
#include "dbc_diagnostic.h"
#include "typefactory.h"
#include <stdexcept>
#include <string>
#include <unordered_map>
 
struct PendingValueDescriptions {
    std::uint32_t canId;
    bool isExtended;
    std::string signalName;
    ValueDescriptions descriptions;
    std::size_t lineNumber;
};
 
class DbcDiagnosticError : public std::runtime_error {
public:
    DbcDiagnosticError(DbcDiagnosticCode code, const std::string &filePath,
                       std::size_t lineNumber, const std::string &message)
        : std::runtime_error(filePath + ":" + std::to_string(lineNumber) + ": " + message),
          diagnostic{DbcDiagnosticSeverity::Error, code, filePath, lineNumber, message} {}
 
    DbcDiagnostic diagnostic;
};
 
struct DbcParseContext {
    DbcDatabase &database;
    FrameInfo *currentFrame = nullptr;
    std::size_t lineNumber = 0U;
    std::vector<PendingValueDescriptions> pendingValues = {};
 
    std::vector<std::vector<std::size_t>> signalLines = {};
    void ValidateMultiplexing(const std::string &filePath) const;
 
    void ResolveValueDescriptions(const std::string &filePath);
};
 
class DbcStatementHandler {
public:
    virtual ~DbcStatementHandler() = default;
    virtual void Handle(const std::string &line, DbcParseContext &context) const = 0;
};
 
class DbcFrameHandler : public DbcStatementHandler {
public:
    void Handle(const std::string &line, DbcParseContext &context) const override;
 
private:
    static FrameInfo ParseFrameLine(const std::string &line);
};
 
class DbcSignalHandler : public DbcStatementHandler {
public:
    void Handle(const std::string &line, DbcParseContext &context) const override;
 
private:
    static SignalInfo ParseSignalLine(const std::string &line);
};
 
class DbcCommentHandler : public DbcStatementHandler {
public:
    void Handle(const std::string &line, DbcParseContext &context) const override;
 
private:
    static void ParseCommentLine(const std::string &line, DbcDatabase &database);
};
 
class DbcValueDescriptionHandler : public DbcStatementHandler {
public:
    void Handle(const std::string &line, DbcParseContext &context) const override;
};
 
class DbcUnsupportedMultiplexingHandler : public DbcStatementHandler {
public:
    void Handle(const std::string &line, DbcParseContext &context) const override;
};
 
class DbcHeaderHandler : public DbcStatementHandler {
public:
    void Handle(const std::string &line, DbcParseContext &context) const override;
};
 
class DbcStatementDispatcher {
public:
    DbcStatementDispatcher();
 
    template<class Handler>
    void RegisterType(const std::string &keyword) {
        m_factory.registerType<Handler>(keyword);
        m_handlers.insert_or_assign(keyword, m_factory.create(keyword));
    }
 
    bool Dispatch(const std::string &line, DbcParseContext &context) const;
 
private:
    using HandlerMap = std::unordered_map<std::string, std::shared_ptr<DbcStatementHandler>>;
    TypeFactory<std::string, DbcStatementHandler> m_factory;
    HandlerMap m_handlers;
};
 
#endif /* DBC_STATEMENT_HANDLER_H */