001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.tools;
003
004import java.io.BufferedInputStream;
005import java.io.File;
006import java.io.IOException;
007import java.io.InputStream;
008import java.lang.annotation.Retention;
009import java.lang.annotation.RetentionPolicy;
010import java.net.URL;
011import java.nio.charset.StandardCharsets;
012import java.nio.file.InvalidPathException;
013import java.text.MessageFormat;
014import java.util.ArrayList;
015import java.util.Arrays;
016import java.util.Collection;
017import java.util.Comparator;
018import java.util.HashMap;
019import java.util.Locale;
020import java.util.Map;
021import java.util.zip.ZipEntry;
022import java.util.zip.ZipFile;
023
024/**
025 * Internationalisation support.
026 *
027 * @author Immanuel.Scholz
028 */
029public final class I18n {
030
031    /**
032     * This annotates strings which do not permit a clean i18n. This is mostly due to strings
033     * containing two nouns which can occur in singular or plural form.
034     * <br>
035     * No behaviour is associated with this annotation.
036     */
037    @Retention(RetentionPolicy.SOURCE)
038    public @interface QuirkyPluralString {
039    }
040
041    private I18n() {
042        // Hide default constructor for utils classes
043    }
044
045    /**
046     * Enumeration of possible plural modes. It allows us to identify and implement logical conditions of
047     * plural forms defined on <a href="https://help.launchpad.net/Translations/PluralForms">Launchpad</a>.
048     * See <a href="http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html">CLDR</a>
049     * for another complete list.
050     * @see #pluralEval
051     */
052    private enum PluralMode {
053        /** Plural = Not 1. This is the default for many languages, including English: 1 day, but 0 days or 2 days. */
054        MODE_NOTONE,
055        /** No plural. Mainly for Asian languages (Indonesian, Chinese, Japanese, ...) */
056        MODE_NONE,
057        /** Plural = Greater than 1. For some latin languages (French, Brazilian Portuguese) */
058        MODE_GREATERONE,
059        /* Special mode for
060         * <a href="http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html#ar">Arabic</a>.*
061        MODE_AR,*/
062        /** Special mode for
063         * <a href="http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html#cs">Czech</a>. */
064        MODE_CS,
065        /** Special mode for
066         * <a href="http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html#pl">Polish</a>. */
067        MODE_PL,
068        /* Special mode for
069         * <a href="http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html#ro">Romanian</a>.*
070        MODE_RO,*/
071        /** Special mode for
072         * <a href="http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html#lt">Lithuanian</a>. */
073        MODE_LT,
074        /** Special mode for
075         * <a href="http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html#ru">Russian</a>. */
076        MODE_RU,
077        /** Special mode for
078         * <a href="http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html#sk">Slovak</a>. */
079        MODE_SK,
080        /* Special mode for
081         * <a href="http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html#sl">Slovenian</a>.*
082        MODE_SL,*/
083    }
084
085    private static volatile PluralMode pluralMode = PluralMode.MODE_NOTONE; /* english default */
086    private static volatile String loadedCode = "en";
087
088    /** Map (english/locale) of singular strings **/
089    private static volatile Map<String, String> strings;
090    /** Map (english/locale) of plural strings **/
091    private static volatile Map<String, String[]> pstrings;
092    private static Locale originalLocale = Locale.getDefault();
093    private static Map<String, PluralMode> languages = new HashMap<>();
094    // NOTE: check also WikiLanguage handling in LanguageInfo.java when adding new languages
095    static {
096        //languages.put("ar", PluralMode.MODE_AR);
097        languages.put("ast", PluralMode.MODE_NOTONE);
098        languages.put("bg", PluralMode.MODE_NOTONE);
099        languages.put("be", PluralMode.MODE_RU);
100        languages.put("ca", PluralMode.MODE_NOTONE);
101        languages.put("ca@valencia", PluralMode.MODE_NOTONE);
102        languages.put("cs", PluralMode.MODE_CS);
103        languages.put("da", PluralMode.MODE_NOTONE);
104        languages.put("de", PluralMode.MODE_NOTONE);
105        languages.put("el", PluralMode.MODE_NOTONE);
106        languages.put("en_AU", PluralMode.MODE_NOTONE);
107        languages.put("en_CA", PluralMode.MODE_NOTONE);
108        languages.put("en_GB", PluralMode.MODE_NOTONE);
109        languages.put("es", PluralMode.MODE_NOTONE);
110        languages.put("et", PluralMode.MODE_NOTONE);
111        //languages.put("eu", PluralMode.MODE_NOTONE);
112        languages.put("fi", PluralMode.MODE_NOTONE);
113        languages.put("fr", PluralMode.MODE_GREATERONE);
114        languages.put("gl", PluralMode.MODE_NOTONE);
115        //languages.put("he", PluralMode.MODE_NOTONE);
116        languages.put("hu", PluralMode.MODE_NOTONE);
117        languages.put("id", PluralMode.MODE_NONE);
118        //languages.put("is", PluralMode.MODE_NOTONE);
119        languages.put("it", PluralMode.MODE_NOTONE);
120        languages.put("ja", PluralMode.MODE_NONE);
121        languages.put("ko", PluralMode.MODE_NONE);
122        // fully supported only with Java 8 and later (needs CLDR)
123        languages.put("km", PluralMode.MODE_NONE);
124        languages.put("lt", PluralMode.MODE_LT);
125        languages.put("nb", PluralMode.MODE_NOTONE);
126        languages.put("nl", PluralMode.MODE_NOTONE);
127        languages.put("pl", PluralMode.MODE_PL);
128        languages.put("pt", PluralMode.MODE_NOTONE);
129        languages.put("pt_BR", PluralMode.MODE_GREATERONE);
130        //languages.put("ro", PluralMode.MODE_RO);
131        languages.put("ru", PluralMode.MODE_RU);
132        languages.put("sk", PluralMode.MODE_SK);
133        //languages.put("sl", PluralMode.MODE_SL);
134        languages.put("sv", PluralMode.MODE_NOTONE);
135        //languages.put("tr", PluralMode.MODE_NONE);
136        languages.put("uk", PluralMode.MODE_RU);
137        languages.put("vi", PluralMode.MODE_NONE);
138        languages.put("zh_CN", PluralMode.MODE_NONE);
139        languages.put("zh_TW", PluralMode.MODE_NONE);
140    }
141
142    private static String format(String text, Object... objects) {
143        try {
144            return MessageFormat.format(text, objects);
145        } catch (InvalidPathException e) {
146            System.err.println("!!! Unable to format '" + text + "': " + e.getMessage());
147            e.printStackTrace();
148            return null;
149        }
150    }
151
152    /**
153     * Translates some text for the current locale.
154     * These strings are collected by a script that runs on the source code files.
155     * After translation, the localizations are distributed with the main program.
156     * <br>
157     * For example, <code>tr("JOSM''s default value is ''{0}''.", val)</code>.
158     * <br>
159     * Use {@link #trn} for distinguishing singular from plural text, i.e.,
160     * do not use {@code tr(size == 1 ? "singular" : "plural")} nor
161     * {@code size == 1 ? tr("singular") : tr("plural")}
162     *
163     * @param text the text to translate.
164     * Must be a string literal. (No constants or local vars.)
165     * Can be broken over multiple lines.
166     * An apostrophe ' must be quoted by another apostrophe.
167     * @param objects the parameters for the string.
168     * Mark occurrences in {@code text} with <code>{0}</code>, <code>{1}</code>, ...
169     * @return the translated string.
170     * @see #trn
171     * @see #trc
172     * @see #trnc
173     */
174    public static String tr(String text, Object... objects) {
175        if (text == null) return null;
176        return format(gettext(text, null), objects);
177    }
178
179    /**
180     * Translates some text in a context for the current locale.
181     * There can be different translations for the same text within different contexts.
182     *
183     * @param context string that helps translators to find an appropriate
184     * translation for {@code text}.
185     * @param text the text to translate.
186     * @return the translated string.
187     * @see #tr
188     * @see #trn
189     * @see #trnc
190     */
191    public static String trc(String context, String text) {
192        if (context == null)
193            return tr(text);
194        if (text == null)
195            return null;
196        return format(gettext(text, context), (Object) null);
197    }
198
199    public static String trcLazy(String context, String text) {
200        if (context == null)
201            return tr(text);
202        if (text == null)
203            return null;
204        return format(gettextLazy(text, context), (Object) null);
205    }
206
207    /**
208     * Marks a string for translation (such that a script can harvest
209     * the translatable strings from the source files).
210     *
211     * For example, <code>
212     * String[] options = new String[] {marktr("up"), marktr("down")};
213     * lbl.setText(tr(options[0]));</code>
214     * @param text the string to be marked for translation.
215     * @return {@code text} unmodified.
216     */
217    public static String marktr(String text) {
218        return text;
219    }
220
221    public static String marktrc(String context, String text) {
222        return text;
223    }
224
225    /**
226     * Translates some text for the current locale and distinguishes between
227     * {@code singularText} and {@code pluralText} depending on {@code n}.
228     * <br>
229     * For instance, {@code trn("There was an error!", "There were errors!", i)} or
230     * <code>trn("Found {0} error in {1}!", "Found {0} errors in {1}!", i, Integer.toString(i), url)</code>.
231     *
232     * @param singularText the singular text to translate.
233     * Must be a string literal. (No constants or local vars.)
234     * Can be broken over multiple lines.
235     * An apostrophe ' must be quoted by another apostrophe.
236     * @param pluralText the plural text to translate.
237     * Must be a string literal. (No constants or local vars.)
238     * Can be broken over multiple lines.
239     * An apostrophe ' must be quoted by another apostrophe.
240     * @param n a number to determine whether {@code singularText} or {@code pluralText} is used.
241     * @param objects the parameters for the string.
242     * Mark occurrences in {@code singularText} and {@code pluralText} with <code>{0}</code>, <code>{1}</code>, ...
243     * @return the translated string.
244     * @see #tr
245     * @see #trc
246     * @see #trnc
247     */
248    public static String trn(String singularText, String pluralText, long n, Object... objects) {
249        return format(gettextn(singularText, pluralText, null, n), objects);
250    }
251
252    /**
253     * Translates some text in a context for the current locale and distinguishes between
254     * {@code singularText} and {@code pluralText} depending on {@code n}.
255     * There can be different translations for the same text within different contexts.
256     *
257     * @param context string that helps translators to find an appropriate
258     * translation for {@code text}.
259     * @param singularText the singular text to translate.
260     * Must be a string literal. (No constants or local vars.)
261     * Can be broken over multiple lines.
262     * An apostrophe ' must be quoted by another apostrophe.
263     * @param pluralText the plural text to translate.
264     * Must be a string literal. (No constants or local vars.)
265     * Can be broken over multiple lines.
266     * An apostrophe ' must be quoted by another apostrophe.
267     * @param n a number to determine whether {@code singularText} or {@code pluralText} is used.
268     * @param objects the parameters for the string.
269     * Mark occurrences in {@code singularText} and {@code pluralText} with <code>{0}</code>, <code>{1}</code>, ...
270     * @return the translated string.
271     * @see #tr
272     * @see #trc
273     * @see #trn
274     */
275    public static String trnc(String context, String singularText, String pluralText, long n, Object... objects) {
276        return format(gettextn(singularText, pluralText, context, n), objects);
277    }
278
279    private static String gettext(String text, String ctx, boolean lazy) {
280        int i;
281        if (ctx == null && text.startsWith("_:") && (i = text.indexOf('\n')) >= 0) {
282            ctx = text.substring(2, i-1);
283            text = text.substring(i+1);
284        }
285        if (strings != null) {
286            String trans = strings.get(ctx == null ? text : "_:"+ctx+'\n'+text);
287            if (trans != null)
288                return trans;
289        }
290        if (pstrings != null) {
291            i = pluralEval(1);
292            String[] trans = pstrings.get(ctx == null ? text : "_:"+ctx+'\n'+text);
293            if (trans != null && trans.length > i)
294                return trans[i];
295        }
296        return lazy ? gettext(text, null) : text;
297    }
298
299    private static String gettext(String text, String ctx) {
300        return gettext(text, ctx, false);
301    }
302
303    /* try without context, when context try fails */
304    private static String gettextLazy(String text, String ctx) {
305        return gettext(text, ctx, true);
306    }
307
308    private static String gettextn(String text, String plural, String ctx, long num) {
309        int i;
310        if (ctx == null && text.startsWith("_:") && (i = text.indexOf('\n')) >= 0) {
311            ctx = text.substring(2, i-1);
312            text = text.substring(i+1);
313        }
314        if (pstrings != null) {
315            i = pluralEval(num);
316            String[] trans = pstrings.get(ctx == null ? text : "_:"+ctx+'\n'+text);
317            if (trans != null && trans.length > i)
318                return trans[i];
319        }
320
321        return num == 1 ? text : plural;
322    }
323
324    public static String escape(String msg) {
325        if (msg == null) return null;
326        return msg.replace("\'", "\'\'").replace("{", "\'{\'").replace("}", "\'}\'");
327    }
328
329    private static URL getTranslationFile(String lang) {
330        return I18n.class.getResource("/data/"+lang.replace('@', '-')+".lang");
331    }
332
333    /**
334     * Get a list of all available JOSM Translations.
335     * @return an array of locale objects.
336     */
337    public static Locale[] getAvailableTranslations() {
338        Collection<Locale> v = new ArrayList<>(languages.size());
339        if (getTranslationFile("en") != null) {
340            for (String loc : languages.keySet()) {
341                if (getTranslationFile(loc) != null) {
342                    v.add(LanguageInfo.getLocale(loc));
343                }
344            }
345        }
346        v.add(Locale.ENGLISH);
347        Locale[] l = new Locale[v.size()];
348        l = v.toArray(l);
349        Arrays.sort(l, Comparator.comparing(Locale::toString));
350        return l;
351    }
352
353    /**
354     * Determines if a language exists for the given code.
355     * @param code The language code
356     * @return {@code true} if a language exists, {@code false} otherwise
357     */
358    public static boolean hasCode(String code) {
359        return languages.containsKey(code);
360    }
361
362    static String setupJavaLocaleProviders() {
363        // Look up SPI providers first (for JosmDecimalFormatSymbolsProvider).
364        // Enable CLDR locale provider on Java 8 to get additional languages, such as Khmer.
365        // https://docs.oracle.com/javase/8/docs/technotes/guides/intl/enhancements.8.html#cldr
366        // FIXME: This must be updated after we switch to Java 9.
367        // See https://docs.oracle.com/javase/9/docs/api/java/util/spi/LocaleServiceProvider.html
368        try {
369            try {
370                // First check we're able to open a stream to our own SPI file
371                // Java will fail on Windows if the jar file is in a folder with a space character!
372                I18n.class.getResourceAsStream("/META-INF/services/java.text.spi.DecimalFormatSymbolsProvider").close();
373                // Don't call Utils.updateSystemProperty to avoid spurious log at startup
374                return System.setProperty("java.locale.providers", "SPI,JRE,CLDR");
375            } catch (RuntimeException | IOException e) {
376                // Don't call Logging class, it may not be fully initialized yet
377                System.err.println("Unable to set SPI locale provider: " + e.getMessage());
378            }
379        } catch (SecurityException e) {
380            // Don't call Logging class, it may not be fully initialized yet
381            System.err.println("Unable to set locale providers: " + e.getMessage());
382        }
383        return System.setProperty("java.locale.providers", "JRE,CLDR");
384    }
385
386    /**
387     * I18n initialization.
388     */
389    public static void init() {
390        setupJavaLocaleProviders();
391
392        /* try initial language settings, may be changed later again */
393        if (!load(LanguageInfo.getJOSMLocaleCode())) {
394            Locale.setDefault(Locale.ENGLISH);
395        }
396    }
397
398    /**
399     * I18n initialization for plugins.
400     * @param source file path/name of the JAR or Zip file containing translation strings
401     * @since 4159
402     */
403    public static void addTexts(File source) {
404        if ("en".equals(loadedCode))
405            return;
406        final ZipEntry enfile = new ZipEntry("data/en.lang");
407        final ZipEntry langfile = new ZipEntry("data/"+loadedCode+".lang");
408        try (
409            ZipFile zipFile = new ZipFile(source, StandardCharsets.UTF_8);
410            InputStream orig = zipFile.getInputStream(enfile);
411            InputStream trans = zipFile.getInputStream(langfile)
412        ) {
413            if (orig != null && trans != null)
414                load(orig, trans, true);
415        } catch (IOException | InvalidPathException e) {
416            Logging.trace(e);
417        }
418    }
419
420    private static boolean load(String l) {
421        if ("en".equals(l) || "en_US".equals(l)) {
422            strings = null;
423            pstrings = null;
424            loadedCode = "en";
425            pluralMode = PluralMode.MODE_NOTONE;
426            return true;
427        }
428        URL en = getTranslationFile("en");
429        if (en == null)
430            return false;
431        URL tr = getTranslationFile(l);
432        if (tr == null || !languages.containsKey(l)) {
433            return false;
434        }
435        try (
436            InputStream enStream = Utils.openStream(en);
437            InputStream trStream = Utils.openStream(tr)
438        ) {
439            if (load(enStream, trStream, false)) {
440                pluralMode = languages.get(l);
441                loadedCode = l;
442                return true;
443            }
444        } catch (IOException e) {
445            // Ignore exception
446            Logging.trace(e);
447        }
448        return false;
449    }
450
451    private static boolean load(InputStream en, InputStream tr, boolean add) {
452        Map<String, String> s;
453        Map<String, String[]> p;
454        if (add) {
455            s = strings;
456            p = pstrings;
457        } else {
458            s = new HashMap<>();
459            p = new HashMap<>();
460        }
461        /* file format:
462           Files are always a group. English file and translated file must provide identical datasets.
463
464           for all single strings:
465           {
466             unsigned short (2 byte) stringlength
467               - length 0 indicates missing translation
468               - length 0xFFFE indicates translation equal to original, but otherwise is equal to length 0
469             string
470           }
471           unsigned short (2 byte) 0xFFFF (marks end of single strings)
472           for all multi strings:
473           {
474             unsigned char (1 byte) stringcount
475               - count 0 indicates missing translations
476               - count 0xFE indicates translations equal to original, but otherwise is equal to length 0
477             for stringcount
478               unsigned short (2 byte) stringlength
479               string
480           }
481         */
482        try {
483            InputStream ens = new BufferedInputStream(en);
484            InputStream trs = new BufferedInputStream(tr);
485            byte[] enlen = new byte[2];
486            byte[] trlen = new byte[2];
487            boolean multimode = false;
488            byte[] str = new byte[4096];
489            for (;;) {
490                if (multimode) {
491                    int ennum = ens.read();
492                    int trnum = trs.read();
493                    if (trnum == 0xFE) /* marks identical string, handle equally to non-translated */
494                        trnum = 0;
495                    if ((ennum == -1 && trnum != -1) || (ennum != -1 && trnum == -1)) /* files do not match */
496                        return false;
497                    if (ennum == -1) {
498                        break;
499                    }
500                    String[] enstrings = new String[ennum];
501                    for (int i = 0; i < ennum; ++i) {
502                        int val = ens.read(enlen);
503                        if (val != 2) /* file corrupt */
504                            return false;
505                        val = (enlen[0] < 0 ? 256+enlen[0] : enlen[0])*256+(enlen[1] < 0 ? 256+enlen[1] : enlen[1]);
506                        if (val > str.length) {
507                            str = new byte[val];
508                        }
509                        int rval = ens.read(str, 0, val);
510                        if (rval != val) /* file corrupt */
511                            return false;
512                        enstrings[i] = new String(str, 0, val, StandardCharsets.UTF_8);
513                    }
514                    String[] trstrings = new String[trnum];
515                    for (int i = 0; i < trnum; ++i) {
516                        int val = trs.read(trlen);
517                        if (val != 2) /* file corrupt */
518                            return false;
519                        val = (trlen[0] < 0 ? 256+trlen[0] : trlen[0])*256+(trlen[1] < 0 ? 256+trlen[1] : trlen[1]);
520                        if (val > str.length) {
521                            str = new byte[val];
522                        }
523                        int rval = trs.read(str, 0, val);
524                        if (rval != val) /* file corrupt */
525                            return false;
526                        trstrings[i] = new String(str, 0, val, StandardCharsets.UTF_8);
527                    }
528                    if (trnum > 0 && !p.containsKey(enstrings[0])) {
529                        p.put(enstrings[0], trstrings);
530                    }
531                } else {
532                    int enval = ens.read(enlen);
533                    int trval = trs.read(trlen);
534                    if (enval != trval) /* files do not match */
535                        return false;
536                    if (enval == -1) {
537                        break;
538                    }
539                    if (enval != 2) /* files corrupt */
540                        return false;
541                    enval = (enlen[0] < 0 ? 256+enlen[0] : enlen[0])*256+(enlen[1] < 0 ? 256+enlen[1] : enlen[1]);
542                    trval = (trlen[0] < 0 ? 256+trlen[0] : trlen[0])*256+(trlen[1] < 0 ? 256+trlen[1] : trlen[1]);
543                    if (trval == 0xFFFE) /* marks identical string, handle equally to non-translated */
544                        trval = 0;
545                    if (enval == 0xFFFF) {
546                        multimode = true;
547                        if (trval != 0xFFFF) /* files do not match */
548                            return false;
549                    } else {
550                        if (enval > str.length) {
551                            str = new byte[enval];
552                        }
553                        if (trval > str.length) {
554                            str = new byte[trval];
555                        }
556                        int val = ens.read(str, 0, enval);
557                        if (val != enval) /* file corrupt */
558                            return false;
559                        String enstr = new String(str, 0, enval, StandardCharsets.UTF_8);
560                        if (trval != 0) {
561                            val = trs.read(str, 0, trval);
562                            if (val != trval) /* file corrupt */
563                                return false;
564                            String trstr = new String(str, 0, trval, StandardCharsets.UTF_8);
565                            if (!s.containsKey(enstr))
566                                s.put(enstr, trstr);
567                        }
568                    }
569                }
570            }
571        } catch (IOException e) {
572            Logging.trace(e);
573            return false;
574        }
575        if (!s.isEmpty()) {
576            strings = s;
577            pstrings = p;
578            return true;
579        }
580        return false;
581    }
582
583    /**
584     * Sets the default locale (see {@link Locale#setDefault(Locale)} to the local
585     * given by <code>localName</code>.
586     *
587     * Ignored if localeName is null. If the locale with name <code>localName</code>
588     * isn't found the default local is set to <code>en</code> (english).
589     *
590     * @param localeName the locale name. Ignored if null.
591     */
592    public static void set(String localeName) {
593        if (localeName != null) {
594            Locale l = LanguageInfo.getLocale(localeName);
595            if (load(LanguageInfo.getJOSMLocaleCode(l))) {
596                Locale.setDefault(l);
597            } else {
598                if (!"en".equals(l.getLanguage())) {
599                    Logging.info(tr("Unable to find translation for the locale {0}. Reverting to {1}.",
600                            LanguageInfo.getDisplayName(l), LanguageInfo.getDisplayName(Locale.getDefault())));
601                } else {
602                    strings = null;
603                    pstrings = null;
604                }
605            }
606        }
607    }
608
609    private static int pluralEval(long n) {
610        switch(pluralMode) {
611        case MODE_NOTONE: /* bg, da, de, el, en, en_AU, en_CA, en_GB, es, et, eu, fi, gl, is, it, iw_IL, nb, nl, sv */
612            return (n != 1) ? 1 : 0;
613        case MODE_NONE: /* id, vi, ja, km, tr, zh_CN, zh_TW */
614            return 0;
615        case MODE_GREATERONE: /* fr, pt_BR */
616            return (n > 1) ? 1 : 0;
617        case MODE_CS:
618            return (n == 1) ? 0 : (((n >= 2) && (n <= 4)) ? 1 : 2);
619        //case MODE_AR:
620        //    return ((n == 0) ? 0 : ((n == 1) ? 1 : ((n == 2) ? 2 : ((((n % 100) >= 3)
621        //            && ((n % 100) <= 10)) ? 3 : ((((n % 100) >= 11) && ((n % 100) <= 99)) ? 4 : 5)))));
622        case MODE_PL:
623            return (n == 1) ? 0 : (((((n % 10) >= 2) && ((n % 10) <= 4))
624                    && (((n % 100) < 10) || ((n % 100) >= 20))) ? 1 : 2);
625        //case MODE_RO:
626        //    return ((n == 1) ? 0 : ((((n % 100) > 19) || (((n % 100) == 0) && (n != 0))) ? 2 : 1));
627        case MODE_LT:
628            return ((n % 10) == 1) && ((n % 100) != 11) ? 0 : (((n % 10) >= 2)
629                    && (((n % 100) < 10) || ((n % 100) >= 20)) ? 1 : 2);
630        case MODE_RU:
631            return (((n % 10) == 1) && ((n % 100) != 11)) ? 0 : (((((n % 10) >= 2)
632                    && ((n % 10) <= 4)) && (((n % 100) < 10) || ((n % 100) >= 20))) ? 1 : 2);
633        case MODE_SK:
634            return (n == 1) ? 1 : (((n >= 2) && (n <= 4)) ? 2 : 0);
635        //case MODE_SL:
636        //    return (((n % 100) == 1) ? 1 : (((n % 100) == 2) ? 2 : ((((n % 100) == 3)
637        //            || ((n % 100) == 4)) ? 3 : 0)));
638        }
639        return 0;
640    }
641
642    /**
643     * Returns the map of singular translations.
644     * @return the map of singular translations.
645     * @since 13761
646     */
647    public static Map<String, String> getSingularTranslations() {
648        return new HashMap<>(strings);
649    }
650
651    /**
652     * Returns the map of plural translations.
653     * @return the map of plural translations.
654     * @since 13761
655     */
656    public static Map<String, String[]> getPluralTranslations() {
657        return new HashMap<>(pstrings);
658    }
659
660    /**
661     * Returns the original default locale found when the JVM started.
662     * Used to guess real language/country of current user disregarding language chosen in JOSM preferences.
663     * @return the original default locale found when the JVM started
664     * @since 14013
665     */
666    public static Locale getOriginalLocale() {
667        return originalLocale;
668    }
669}