Added localization support

src/main/java/ru/windcorp/progressia/client/graphics/gui/LayerTestGUI.java

@@ -27,6 +27,9 @@ import ru.windcorp.progressia.client.graphics.gui.event.HoverEvent;
 import ru.windcorp.progressia.client.graphics.gui.layout.LayoutAlign;
 import ru.windcorp.progressia.client.graphics.gui.layout.LayoutVertical;
 import ru.windcorp.progressia.client.graphics.input.KeyEvent;
+import ru.windcorp.progressia.client.localization.Localizer;
+
+import java.net.http.WebSocket;
 
 public class LayerTestGUI extends GUILayer {
 	
@@ -78,12 +81,14 @@ public class LayerTestGUI extends GUILayer {
 		Component charlie = new DebugComponent("Charlie", null, 0x222222);
 		charlie.setLayout(new LayoutVertical());
 
+		//Debug
+		Localizer.getInstance().setLanguage("ru-RU");
 		// These two are swapped in code due to a bug in layouts, fixing ATM
 		charlie.addChild(
 				new Label(
 						"Epsilon",
 						new Font().withColor(0x4444BB).deriveItalic(),
-						"Hooray?.. \u269b"
+						Localizer.getInstance().getValue("Epsilon")+"\u269b"
 				)
 		);
 		charlie.addChild(

src/main/java/ru/windcorp/progressia/client/localization/LocaleListener.java

@@ -0,0 +1,6 @@
+package ru.windcorp.progressia.client.localization;
+
+@FunctionalInterface
+public interface LocaleListener {
+    void onLocaleChanged(String newLanguage);
+}

src/main/java/ru/windcorp/progressia/client/localization/Localizer.java

@@ -0,0 +1,76 @@
+package ru.windcorp.progressia.client.localization;
+
+import java.lang.ref.WeakReference;
+import java.util.*;
+
+public class Localizer  {
+    private static final Localizer instance = new Localizer("assets/languages/lang_list.txt");
+
+    private final Parser langParser;
+
+    private String language;
+    private final String langFolder;
+
+    private Map<String, String> data;
+    private final Map<String, String> langList;
+
+    private final Collection<WeakReference<LocaleListener>> listeners =
+            Collections.synchronizedCollection(new LinkedList<>());
+
+    //lang list must be in the same folder as .lang files
+    public Localizer(String langList) {
+        this.langFolder = langList.concat("/../");
+        langParser = new Parser(langList);
+        this.langList = langParser.parse();
+    }
+
+    public synchronized void setLanguage(String language) {
+        if (langList.containsKey(language)) {
+            this.language = language;
+            langParser.setFilePath(langFolder + language + ".lang");
+            data = langParser.parse();
+            pokeListeners(language);
+        } else {
+            throw new RuntimeException("Language not found: " + language);
+        }
+    }
+
+    public synchronized String getLanguage() {
+        return language;
+    }
+
+    public synchronized String getValue(String key) {
+        try {
+            return data.getOrDefault(key, key);
+        } catch (NullPointerException e) {
+            e.printStackTrace();
+            return key;
+        }
+    }
+
+    private void pokeListeners(String newLanguage) {
+        synchronized (listeners) {
+            Iterator<WeakReference<LocaleListener>> iterator = listeners.iterator();
+            while (iterator.hasNext()) {
+                LocaleListener listenerOrNull = iterator.next().get();
+                if (listenerOrNull == null) {
+                    iterator.remove();
+                } else {
+                    listenerOrNull.onLocaleChanged(newLanguage);
+                }
+            }
+        }
+    }
+
+    public static Localizer getInstance() {
+        return instance;
+    }
+
+    public void addListener(LocaleListener listener) {
+        listeners.add(new WeakReference<>(listener));
+    }
+
+    public void removeListener(LocaleListener listener) {
+        listeners.removeIf(ref -> listener.equals(ref.get()));
+    }
+}

src/main/java/ru/windcorp/progressia/client/localization/Parser.java

@@ -0,0 +1,94 @@
+package ru.windcorp.progressia.client.localization;
+
+import ru.windcorp.jputil.chars.EscapeException;
+import ru.windcorp.jputil.chars.Escaper;
+import ru.windcorp.progressia.common.resource.ResourceManager;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.Reader;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Parser {
+
+    public Parser(String filePath) {
+        this.filePath = filePath;
+    }
+
+    public void setFilePath(String filePath) {
+        this.filePath = filePath;
+    }
+
+    public Map<String, String> parse() {
+        Map<String, String> parsedData = new HashMap<>();
+        try (Reader rawData = ResourceManager
+                .getResource(filePath)
+                .getReader()
+        ) {
+            int code;
+            char c;
+            StringBuilder stringBuilder = new StringBuilder();
+            while (true) {
+                code = rawData.read();
+                if (code == -1) {
+                    break;
+                }
+                c = (char)code;
+                if (c == '#') {
+                    while (c != '\n') {
+                        code = rawData.read();
+                        if (code == -1) {
+                            break;
+                        }
+                        c = (char)code;
+                    }
+                } else if (c == ' ') {
+                    code = rawData.read();
+                    if (code == -1) {
+                        break;
+                    }
+                    c = (char) code;
+                    if (c == '=') {
+                        String key = escaper.escape(stringBuilder.toString());
+                        stringBuilder.setLength(0);
+                        rawData.read(); //skip a char
+                        while (true) {
+                            code = rawData.read();
+                            if (code == -1) {
+                                break;
+                            }
+
+                            c = (char) code;
+                            if (code == '\n') {
+                                break;
+                            } else {
+                                stringBuilder.append(c);
+                            }
+                        }
+                        parsedData.put(escaper.unescape(key),
+                                escaper.unescape(stringBuilder.toString()));
+                        stringBuilder.setLength(0);
+                    }
+                } else if (c == '\n') {
+                    stringBuilder.setLength(0);
+                } else {
+                    stringBuilder.append(c);
+                }
+            }
+
+        } catch (IOException | EscapeException e) {
+            throw new RuntimeException(e);
+        }
+        return parsedData;
+    }
+
+    public String getFilePath() {
+        return filePath;
+    }
+
+
+    private String filePath;
+    static private final Escaper escaper = new Escaper.EscaperBuilder()
+            .withChars("n", "\n").build();
+}

src/main/resources/assets/languages/en-US.lang

@@ -0,0 +1,3 @@
+# ru-RU
+#test
+Epsilon = Hooray?..

src/main/resources/assets/languages/lang_list.txt

@@ -0,0 +1,2 @@
+en-US = US English
+ru-RU = Русский

src/main/resources/assets/languages/ru-RU.lang

@@ -0,0 +1,3 @@
+# ru-RU
+#test
+Epsilon = Ура?