1 files changed, 191 insertions, 0 deletions
diff --git a/game/client/language.cc b/game/client/language.cc
new file mode 100644
index 0000000..1b1f751
--- /dev/null
+++ b/game/client/language.cc
@@ -0,0 +1,191 @@
+#include "client/pch.hh"
+#include "client/language.hh"
+
+#include "core/config.hh"
+
+#include "client/globals.hh"
+#include "client/settings.hh"
+
+constexpr static const char *DEFAULT_LANGUAGE = "en_US";
+
+// Available languages are kept in a special manifest file which
+// is essentially a key-value map of semi-IETF-compliant language tags
+// and the language's endonym; after reading the manifest, the translation
+// system knows what language it can load and will act accordingly
+constexpr static const char *MANIFEST_PATH = "lang/manifest.json";
+
+static LanguageManifest manifest;
+static LanguageIterator current_language;
+static std::unordered_map<std::string, std::string> language_map;
+static std::unordered_map<std::string, LanguageIterator> ietf_map;
+static ConfigString config_language(DEFAULT_LANGUAGE);
+
+static void send_language_event(LanguageIterator new_language)
+{
+    LanguageSetEvent event;
+    event.new_language = new_language;
+    globals::dispatcher.trigger(event);
+}
+
+void language::init(void)
+{
+    globals::client_config.add_value("language", config_language);
+
+    settings::add_language_select(0, settings_location::GENERAL, "language");
+
+    auto file = PHYSFS_openRead(MANIFEST_PATH);
+
+    if(file == nullptr) {
+        spdlog::critical("language: {}: {}", MANIFEST_PATH, PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
+        std::terminate();
+    }
+
+    auto source = std::string(PHYSFS_fileLength(file), char(0x00));
+    PHYSFS_readBytes(file, source.data(), source.size());
+    PHYSFS_close(file);
+
+    auto jsonv = json_parse_string(source.c_str());
+    const auto json = json_value_get_object(jsonv);
+    const auto count = json_object_get_count(json);
+
+    if((jsonv == nullptr) || (json == nullptr) || (count == 0)) {
+        spdlog::critical("language: {}: parse error", MANIFEST_PATH);
+        json_value_free(jsonv);
+        std::terminate();
+    }
+
+    for(std::size_t i = 0; i < count; ++i) {
+        const auto ietf = json_object_get_name(json, i);
+        const auto value = json_object_get_value_at(json, i);
+        const auto endonym = json_value_get_string(value);
+
+        if(ietf && endonym) {
+            LanguageInfo info;
+            info.ietf = std::string(ietf);
+            info.endonym = std::string(endonym);
+            info.display = fmt::format("{} ({})", endonym, ietf);
+            manifest.push_back(info);
+        }
+    }
+
+    for(auto it = manifest.cbegin(); it != manifest.cend(); ++it) {
+        ietf_map.emplace(it->ietf, it);
+    }
+
+    json_value_free(jsonv);
+
+    // This is temporary! This value will
+    // be overriden in init_late after the
+    // config system updates config_language
+    current_language = manifest.cend();
+}
+
+void language::init_late(void)
+{
+    auto user_language = ietf_map.find(config_language.get());
+
+    if(user_language != ietf_map.cend()) {
+        language::set(user_language->second);
+        return;
+    }
+
+    auto fallback = ietf_map.find(DEFAULT_LANGUAGE);
+
+    if(fallback != ietf_map.cend()) {
+        language::set(fallback->second);
+        return;
+    }
+
+    spdlog::critical("language: we're doomed!");
+    spdlog::critical("language: {} doesn't exist!", DEFAULT_LANGUAGE);
+    std::terminate();
+}
+
+void language::set(LanguageIterator new_language)
+{
+    if(new_language != manifest.cend()) {
+        auto path = fmt::format("lang/lang.{}.json", new_language->ietf);
+
+        auto file = PHYSFS_openRead(path.c_str());
+
+        if(file == nullptr) {
+            spdlog::warn("language: {}: {}", path, PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
+            send_language_event(new_language);
+            return;
+        }
+
+        auto source = std::string(PHYSFS_fileLength(file), char(0x00));
+        PHYSFS_readBytes(file, source.data(), source.size());
+        PHYSFS_close(file);
+
+        auto jsonv = json_parse_string(source.c_str());
+        const auto json = json_value_get_object(jsonv);
+        const auto count = json_object_get_count(json);
+
+        if((jsonv == nullptr) || (json == nullptr) || (count == 0)) {
+            spdlog::warn("language: {}: parse error", path);
+            send_language_event(new_language);
+            json_value_free(jsonv);
+            return;
+        }
+
+        language_map.clear();
+        
+        for(size_t i = 0; i < count; ++i) {
+            const auto key = json_object_get_name(json, i);
+            const auto value = json_object_get_value_at(json, i);
+            const auto value_str = json_value_get_string(value);
+
+            if(key && value_str) {
+                language_map.emplace(key, value_str);
+                continue;
+            }
+        }
+
+        json_value_free(jsonv);
+
+        current_language = new_language;
+        config_language.set(new_language->ietf.c_str());
+    }
+
+    send_language_event(new_language);
+}
+
+LanguageIterator language::get_current(void)
+{
+    return current_language;
+}
+
+LanguageIterator language::find(const char *ietf)
+{
+    const auto it = ietf_map.find(ietf);
+    if(it != ietf_map.cend())
+        return it->second;
+    return manifest.cend();
+}
+
+LanguageIterator language::cbegin(void)
+{
+    return manifest.cbegin();
+}
+
+LanguageIterator language::cend(void)
+{
+    return manifest.cend();
+}
+
+const char *language::resolve(const char *key)
+{
+    const auto it = language_map.find(key);
+    if(it != language_map.cend())
+        return it->second.c_str();
+    return key;
+}
+
+std::string language::resolve_gui(const char *key)
+{
+    // We need window tags to retain their hierarchy when a language
+    // dynamically changes; ImGui allows to provide hidden unique identifiers
+    // to GUI primitives that have their name change dynamically, so we're using this
+    return fmt::format("{}###{}", language::resolve(key), key);
+}