src/game/java/net/minecraft/locale/Language.java

package net.minecraft.locale;

import com.google.common.collect.ImmutableList;
import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.mojang.logging.LogUtils;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Map.Entry;
import java.util.function.BiConsumer;
import java.util.regex.Pattern;
import net.minecraft.network.chat.FormattedText;
import net.minecraft.network.chat.Style;
import net.minecraft.util.FormattedCharSequence;
import net.minecraft.util.FormattedCharSink;
import net.minecraft.util.GsonHelper;
import net.minecraft.util.StringDecomposer;
import org.slf4j.Logger;

public abstract class Language {
    private static final Logger LOGGER = LogUtils.getLogger();
    private static final Gson GSON = new Gson();
    private static final Pattern UNSUPPORTED_FORMAT_PATTERN = Pattern.compile("%(\\d+\\$)?[\\d.]*[df]");
    public static final String DEFAULT = "en_us";
    private static volatile Language instance = loadDefault();

    private static Language loadDefault() {
        DeprecatedTranslationsInfo deprecatedtranslationsinfo = DeprecatedTranslationsInfo.loadFromDefaultResource();
        Map<String, String> map = new HashMap<>();
        BiConsumer<String, String> biconsumer = map::put;
        parseTranslations(biconsumer, "/assets/minecraft/lang/en_us.json");
        deprecatedtranslationsinfo.applyToMap(map);
        final Map<String, String> map1 = Map.copyOf(map);
        return new Language() {
            @Override
            public String getOrDefault(String p_128127_, String p_265421_) {
                return map1.getOrDefault(p_128127_, p_265421_);
            }

            @Override
            public boolean has(String p_128135_) {
                return map1.containsKey(p_128135_);
            }

            @Override
            public boolean isDefaultRightToLeft() {
                return false;
            }

            @Override
            public FormattedCharSequence getVisualOrder(FormattedText p_128129_) {
                return p_128132_ -> p_128129_.visit(
                            (p_177835_, p_177836_) -> StringDecomposer.iterateFormatted(p_177836_, p_177835_, p_128132_) ? Optional.empty() : FormattedText.STOP_ITERATION,
                            Style.EMPTY
                        )
                        .isPresent();
            }
        };
    }

    private static void parseTranslations(BiConsumer<String, String> p_282031_, String p_283638_) {
        try (InputStream inputstream = Language.class.getResourceAsStream(p_283638_)) {
            loadFromJson(inputstream, p_282031_);
        } catch (JsonParseException | IOException ioexception) {
            LOGGER.error("Couldn't read strings from {}", p_283638_, ioexception);
        }
    }

    public static void loadFromJson(InputStream p_128109_, BiConsumer<String, String> p_128110_) {
        JsonObject jsonobject = GSON.fromJson(new InputStreamReader(p_128109_, StandardCharsets.UTF_8), JsonObject.class);

        for (Entry<String, JsonElement> entry : jsonobject.entrySet()) {
            String s = UNSUPPORTED_FORMAT_PATTERN.matcher(GsonHelper.convertToString(entry.getValue(), entry.getKey())).replaceAll("%$1s");
            p_128110_.accept(entry.getKey(), s);
        }
    }

    public static Language getInstance() {
        return instance;
    }

    public static void inject(Language p_128115_) {
        instance = p_128115_;
    }

    public String getOrDefault(String p_128111_) {
        return this.getOrDefault(p_128111_, p_128111_);
    }

    public abstract String getOrDefault(String p_265702_, String p_265599_);

    public abstract boolean has(String p_128117_);

    public abstract boolean isDefaultRightToLeft();

    public abstract FormattedCharSequence getVisualOrder(FormattedText p_128116_);

    public List<FormattedCharSequence> getVisualOrder(List<FormattedText> p_128113_) {
        return p_128113_.stream().map(this::getVisualOrder).collect(ImmutableList.toImmutableList());
    }
}