SymbolManager.hh

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#ifndef SYMBOL_MANAGER_HH
#define SYMBOL_MANAGER_HH
 
#include "function_ref.hh"
#include "hash_map.hh"
#include "zstring_view.hh"
 
#include <cassert>
#include <cstdint>
#include <optional>
#include <span>
#include <string>
#include <string_view>
#include <vector>
 
namespace openmsx {
 
class CommandController;
 
struct Symbol
{
        Symbol(std::string n, uint16_t v)
                : name(std::move(n)), value(v) {} // clang-15 workaround
 
        std::string name;
        uint16_t value;
 
        auto operator<=>(const Symbol&) const = default;
};
 
struct SymbolFile
{
        enum class Type {
                AUTO_DETECT = 0,
                ASMSX,
                GENERIC, // includes PASMO, SJASM, TNIASM0, TNIASM1
                HTC,
                LINKMAP,
                NOICE,
                VASM,
 
                FIRST = AUTO_DETECT,
                LAST = VASM + 1,
        };
        [[nodiscard]] static zstring_view toString(Type type);
        [[nodiscard]] static std::optional<Type> parseType(std::string_view str);
 
        std::string filename;
        std::vector<Symbol> symbols;
        Type type;
};
 
struct SymbolObserver
{
        virtual void notifySymbolsChanged() = 0;
};
 
class SymbolManager
{
public:
        explicit SymbolManager(CommandController& commandController);
 
        void setObserver(SymbolObserver* observer_) {
                assert(!observer || !observer_);
                observer = observer_;
        }
 
        // Load or reload a file.
        // * Throws on failure to read from file. In that case the existing file is left unchanged.
        // * Parse errors in the file are ignored.
        // * When the file contains no symbols and when 'allowEmpty=false' the
        //   existing file is not replaced and this method returns 'false'.
        //   Otherwise it return 'true'.
        enum class LoadEmpty { ALLOWED, NOT_ALLOWED };
        bool reloadFile(const std::string& filename, LoadEmpty loadEmpty, SymbolFile::Type type);
 
        void removeFile(std::string_view filename);
        void removeAllFiles();
 
        [[nodiscard]] const auto& getFiles() const { return files; }
        [[nodiscard]] std::span<Symbol const * const> lookupValue(uint16_t value);
        [[nodiscard]] std::optional<uint16_t> parseSymbolOrValue(std::string_view s) const;
 
        [[nodiscard]] static std::string getFileFilters();
        [[nodiscard]] static SymbolFile::Type getTypeForFilter(std::string_view filter);
 
//private:
        // These should not be called directly, except by the unittest
        [[nodiscard]] static std::optional<unsigned> isHexDigit(char c);
        [[nodiscard]] static std::optional<uint16_t> is4DigitHex(std::string_view s);
        [[nodiscard]] static std::optional<uint16_t> parseValue(std::string_view str);
        [[nodiscard]] static std::optional<Symbol> checkLabel(std::string_view label, uint16_t value);
        [[nodiscard]] static std::optional<Symbol> checkLabelAndValue(std::string_view label, std::string_view value);
        [[nodiscard]] static SymbolFile::Type detectType(std::string_view filename, std::string_view buffer);
        [[nodiscard]] static SymbolFile loadLines(
                std::string_view filename, std::string_view buffer, SymbolFile::Type type,
                function_ref<std::optional<Symbol>(std::span<std::string_view>)> lineParser);
        [[nodiscard]] static SymbolFile loadGeneric(std::string_view filename, std::string_view buffer);
        [[nodiscard]] static SymbolFile loadNoICE(std::string_view filename, std::string_view buffer);
        [[nodiscard]] static SymbolFile loadHTC(std::string_view filename, std::string_view buffer);
        [[nodiscard]] static SymbolFile loadVASM(std::string_view filename, std::string_view buffer);
        [[nodiscard]] static SymbolFile loadASMSX(std::string_view filename, std::string_view buffer);
        [[nodiscard]] static SymbolFile loadLinkMap(std::string_view filename, std::string_view buffer);
        [[nodiscard]] static SymbolFile loadSymbolFile(const std::string& filename, SymbolFile::Type type);
 
private:
        void refresh();
 
private:
        CommandController& commandController;
        SymbolObserver* observer = nullptr; // only one for now, could become a vector later
        std::vector<SymbolFile> files;
        hash_map<uint16_t, std::vector<const Symbol*>> lookupValueCache; // calculated from 'files'
};
 
 
} // namespace openmsx
 
#endif