SettingsConfig.cc

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#include "SettingsConfig.hh"
#include "MSXException.hh"
#include "StringOp.hh"
#include "File.hh"
#include "FileContext.hh"
#include "FileException.hh"
#include "FileOperations.hh"
#include "MemBuffer.hh"
#include "CliComm.hh"
#include "HotKey.hh"
#include "CommandException.hh"
#include "GlobalCommandController.hh"
#include "TclObject.hh"
#include "XMLOutputStream.hh"
#include "outer.hh"
#include "rapidsax.hh"
#include "unreachable.hh"
 
using std::string;
 
namespace openmsx {
 
struct SettingsParser : rapidsax::NullHandler
{
        void start(std::string_view tag);
        void attribute(std::string_view name, std::string_view value);
        void text(std::string_view txt);
        void stop();
        void doctype(std::string_view txt);
 
        // parse result
        struct Setting {
                std::string_view name;
                std::string_view value;
        };
        std::vector<Setting> settings;
        struct Bind {
                std::string_view key;
                std::string_view cmd;
                bool repeat = false;
                bool event = false;
        };
        std::vector<Bind> binds;
        std::vector<std::string_view> unbinds;
        std::string_view systemID;
 
        // parse state
        unsigned unknownLevel = 0;
        enum State {
                START,
                TOP,
                SETTINGS,
                SETTING,
                BINDINGS,
                BIND,
                UNBIND,
                END
        } state = START;
        Setting currentSetting;
        Bind currentBind;
        std::string_view currentUnbind;
};
 
SettingsConfig::SettingsConfig(
                GlobalCommandController& globalCommandController,
                HotKey& hotKey_)
        : commandController(globalCommandController)
        , saveSettingsCommand(commandController)
        , loadSettingsCommand(commandController)
        , settingsManager(globalCommandController)
        , hotKey(hotKey_)
{
}
 
SettingsConfig::~SettingsConfig()
{
        if (mustSaveSettings) {
                try {
                        saveSetting();
                } catch (FileException& e) {
                        commandController.getCliComm().printWarning(
                                "Auto-saving of settings failed: ", e.getMessage());
                }
        }
}
 
void SettingsConfig::loadSetting(const FileContext& context, std::string_view filename)
{
        string resolved = context.resolve(filename);
 
        MemBuffer<char> buf;
        try {
                File file(resolved);
                auto size = file.getSize();
                buf.resize(size + rapidsax::EXTRA_BUFFER_SPACE);
                file.read(std::span{buf.data(), size});
                buf[size] = 0;
        } catch (FileException& e) {
                throw MSXException("Failed to read settings file '", filename,
                                   "': ", e.getMessage());
        }
        SettingsParser parser;
        rapidsax::parse<0>(parser, buf.data());
        if (parser.systemID != "settings.dtd") {
                throw MSXException(
                        "Failed to parser settings file '", filename,
                        "': systemID doesn't match (expected 'settings.dtd' got '",
                        parser.systemID, "')\n"
                        "You're probably using an old incompatible file format.");
        }
 
        settingValues.clear();
        settingValues.reserve(unsigned(parser.settings.size()));
        for (const auto& [name, value] : parser.settings) {
                settingValues.emplace(name, value);
        }
 
        hotKey.loadInit();
        for (const auto& [key, cmd, repeat, event] : parser.binds) {
                hotKey.loadBind(key, cmd, repeat, event);
        }
        for (const auto& key : parser.unbinds) {
                hotKey.loadUnbind(key);
        }
 
        getSettingsManager().loadSettings(*this);
 
        // only set saveName after file was successfully parsed
        saveName = resolved;
}
 
void SettingsConfig::setSaveFilename(const FileContext& context, std::string_view filename)
{
        saveName = context.resolveCreate(filename);
}
 
const std::string* SettingsConfig::getValueForSetting(std::string_view setting) const
{
        return lookup(settingValues, setting);
}
 
void SettingsConfig::setValueForSetting(std::string_view setting, std::string_view value)
{
        settingValues.insert_or_assign(setting, value);
}
 
void SettingsConfig::removeValueForSetting(std::string_view setting)
{
        settingValues.erase(setting);
}
 
void SettingsConfig::saveSetting(std::string filename)
{
        if (filename.empty()) filename = saveName;
        if (filename.empty()) return;
 
        struct SettingsWriter {
                SettingsWriter(std::string filename)
                        : file(std::move(filename), File::TRUNCATE)
                {
                        std::string_view header =
                                "<!DOCTYPE settings SYSTEM 'settings.dtd'>\n";
                        write(header);
                }
 
                void write(std::span<const char> buf) {
                        file.write(buf);
                }
                void write1(char c) {
                        file.write(std::span{&c, 1});
                }
                void check(bool condition) const {
                        assert(condition); (void)condition;
                }
 
        private:
                File file;
        };
 
        SettingsWriter writer(std::move(filename));
        XMLOutputStream xml(writer);
        xml.begin("settings");
        {
                xml.begin("settings");
                for (const auto& [name, value] : settingValues) {
                        xml.begin("setting");
                        xml.attribute("id", name);
                        xml.data(value);
                        xml.end("setting");
                }
                xml.end("settings");
        }
        {
                hotKey.saveBindings(xml);
        }
        xml.end("settings");
}
 
 
// class SaveSettingsCommand
 
SettingsConfig::SaveSettingsCommand::SaveSettingsCommand(
                CommandController& commandController_)
        : Command(commandController_, "save_settings")
{
}
 
void SettingsConfig::SaveSettingsCommand::execute(
        std::span<const TclObject> tokens, TclObject& /*result*/)
{
        checkNumArgs(tokens, Between{1, 2}, Prefix{1}, "?filename?");
        auto& settingsConfig = OUTER(SettingsConfig, saveSettingsCommand);
        try {
                switch (tokens.size()) {
                case 1:
                        settingsConfig.saveSetting();
                        break;
                case 2:
                        settingsConfig.saveSetting(FileOperations::expandTilde(
                                string(tokens[1].getString())));
                        break;
                }
        } catch (FileException& e) {
                throw CommandException(std::move(e).getMessage());
        }
}
 
string SettingsConfig::SaveSettingsCommand::help(std::span<const TclObject> /*tokens*/) const
{
        return "Save the current settings.";
}
 
void SettingsConfig::SaveSettingsCommand::tabCompletion(std::vector<string>& tokens) const
{
        if (tokens.size() == 2) {
                completeFileName(tokens, systemFileContext());
        }
}
 
 
// class LoadSettingsCommand
 
SettingsConfig::LoadSettingsCommand::LoadSettingsCommand(
                CommandController& commandController_)
        : Command(commandController_, "load_settings")
{
}
 
void SettingsConfig::LoadSettingsCommand::execute(
        std::span<const TclObject> tokens, TclObject& /*result*/)
{
        checkNumArgs(tokens, 2, "filename");
        auto& settingsConfig = OUTER(SettingsConfig, loadSettingsCommand);
        settingsConfig.loadSetting(systemFileContext(), tokens[1].getString());
}
 
string SettingsConfig::LoadSettingsCommand::help(std::span<const TclObject> /*tokens*/) const
{
        return "Load settings from given file.";
}
 
void SettingsConfig::LoadSettingsCommand::tabCompletion(std::vector<string>& tokens) const
{
        if (tokens.size() == 2) {
                completeFileName(tokens, systemFileContext());
        }
}
 
 
void SettingsParser::start(std::string_view tag)
{
        if (unknownLevel) {
                ++unknownLevel;
                return;
        }
        switch (state) {
        case START:
                if (tag == "settings") {
                        state = TOP;
                        return;
                }
                throw MSXException("Expected <settings> as root tag.");
        case TOP:
                if (tag == "settings") {
                        state = SETTINGS;
                        return;
                } else if (tag == "bindings") {
                        state = BINDINGS;
                        return;
                }
                break;
        case SETTINGS:
                if (tag == "setting") {
                        state = SETTING;
                        currentSetting = Setting{};
                        return;
                }
                break;
        case BINDINGS:
                if (tag == "bind") {
                        state = BIND;
                        currentBind = Bind{};
                        return;
                } else if (tag == "unbind") {
                        state = UNBIND;
                        currentUnbind = std::string_view{};
                        return;
                }
                break;
        case SETTING:
        case BIND:
        case UNBIND:
                break;
        case END:
                throw MSXException("Unexpected opening tag: ", tag);
        default:
                UNREACHABLE;
        }
 
        ++unknownLevel;
}
 
void SettingsParser::attribute(std::string_view name, std::string_view value)
{
        if (unknownLevel) return;
 
        switch (state) {
        case SETTING:
                if (name == "id") {
                        currentSetting.name = value;
                }
                break;
        case BIND:
                if (name == "key") {
                        currentBind.key = value;
                } else if (name == "repeat") {
                        currentBind.repeat = StringOp::stringToBool(value);
                } else if (name == "event") {
                        currentBind.event = StringOp::stringToBool(value);
                }
                break;
        case UNBIND:
                if (name == "key") {
                        currentUnbind = value;
                }
                break;
        default:
                break; //nothing
        }
}
 
void SettingsParser::text(std::string_view txt)
{
        if (unknownLevel) return;
 
        switch (state) {
        case SETTING:
                currentSetting.value = txt;
                break;
        case BIND:
                currentBind.cmd = txt;
                break;
        default:
                break; //nothing
        }
}
 
void SettingsParser::stop()
{
        if (unknownLevel) {
                --unknownLevel;
                return;
        }
 
        switch (state) {
        case TOP:
                state = END;
                break;
        case SETTINGS:
                state = TOP;
                break;
        case BINDINGS:
                state = TOP;
                break;
        case SETTING:
                if (!currentSetting.name.empty()) {
                        settings.push_back(currentSetting);
                }
                state = SETTINGS;
                break;
        case BIND:
                if (!currentBind.key.empty()) {
                        binds.push_back(currentBind);
                }
                state = BINDINGS;
                break;
        case UNBIND:
                if (!currentUnbind.empty()) {
                        unbinds.push_back(currentUnbind);
                }
                state = BINDINGS;
                break;
        case START:
        case END:
                throw MSXException("Unexpected closing tag");
        default:
                UNREACHABLE;
        }
}
 
void SettingsParser::doctype(std::string_view txt)
{
        auto pos1 = txt.find(" SYSTEM ");
        if (pos1 == std::string_view::npos) return;
        if ((pos1 + 8) >= txt.size()) return;
        char q = txt[pos1 + 8];
        if (q != one_of('"', '\'')) return;
        auto t = txt.substr(pos1 + 9);
        auto pos2 = t.find(q);
        if (pos2 == std::string_view::npos) return;
 
        systemID = t.substr(0, pos2);
}
 
} // namespace openmsx