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LanguageTool is an Open Source proofreading software for English, French, German, Polish, Romanian, and more than 20 other languages. It finds many errors that a simple spell checker cannot detect like mixing up there/their and it detects some grammar problems.
/* LanguageTool, a natural language style checker
* Copyright (C) 2015 Daniel Naber (http://www.danielnaber.de)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
* USA
*/
package org.languagetool;
import org.jetbrains.annotations.Nullable;
import org.languagetool.tools.MultiKeyProperties;
import org.languagetool.tools.StringTools;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.net.URL;
import java.util.*;
/**
* Helper methods to list all supported languages and to get language objects
* by their name or language code etc.
* @since 2.9
*/
public final class Languages {
private static final List LANGUAGES = getAllLanguages();
private static final String PROPERTIES_PATH = "META-INF/org/languagetool/language-module.properties";
private static final String PROPERTIES_KEY = "languageClasses";
private Languages() {
}
/**
* Language classes are detected at runtime by searching the classpath for files named
* {@code META-INF/org/languagetool/language-module.properties}. Those file(s)
* need to contain a key {@code languageClasses} which specifies the fully qualified
* class name(s), e.g. {@code org.languagetool.language.English}. Use commas to specify
* more than one class.
* @return an unmodifiable list of all supported languages
*/
public static List get() {
List result = new ArrayList<>();
for (Language lang : LANGUAGES) {
if (!"xx".equals(lang.getShortCode())) { // skip demo language
result.add(lang);
}
}
return Collections.unmodifiableList(result);
}
/**
* Like {@link #get()} but the list contains also LanguageTool's internal 'Demo'
* language, if available. Only useful for tests.
* @return an unmodifiable list
*/
public static List getWithDemoLanguage() {
return LANGUAGES;
}
private static List getAllLanguages() {
List languages = new ArrayList<>();
Set languageClassNames = new HashSet<>();
try {
Enumeration propertyFiles = Language.class.getClassLoader().getResources(PROPERTIES_PATH);
while (propertyFiles.hasMoreElements()) {
URL url = propertyFiles.nextElement();
try (InputStream inputStream = url.openStream()) {
// We want to be able to read properties file with duplicate key, as produced by
// Maven when merging files:
MultiKeyProperties props = new MultiKeyProperties(inputStream);
List classNamesStr = props.getProperty(PROPERTIES_KEY);
if (classNamesStr == null) {
throw new RuntimeException("Key '" + PROPERTIES_KEY + "' not found in " + url);
}
for (String classNames : classNamesStr) {
String[] classNamesSplit = classNames.split("\\s*,\\s*");
for (String className : classNamesSplit) {
if (languageClassNames.contains(className)) {
// avoid duplicates - this way we are robust against problems with the maven assembly
// plugin which aggregates files more than once (in case the deployment descriptor
// contains both zip and dir ):
continue;
}
languages.add(createLanguageObjects(url, className));
languageClassNames.add(className);
}
}
}
}
} catch (IOException e) {
throw new RuntimeException(e);
}
return Collections.unmodifiableList(languages);
}
private static Language createLanguageObjects(URL url, String className) {
try {
Class aClass = Class.forName(className);
Constructor constructor = aClass.getConstructor();
return (Language) constructor.newInstance();
} catch (ClassNotFoundException e) {
throw new RuntimeException("Class '" + className + "' specified in " + url + " could not be found in classpath", e);
} catch (Exception e) {
throw new RuntimeException("Object for class '" + className + "' specified in " + url + " could not created", e);
}
}
/**
* Get the Language object for the given language name.
*
* @param languageName e.g. English or German (case is significant)
* @return a Language object or {@code null} if there is no such language
*/
@Nullable
public static Language getLanguageForName(String languageName) {
for (Language element : LANGUAGES) {
if (languageName.equals(element.getName())) {
return element;
}
}
return null;
}
/**
* Get the Language object for the given language code.
* @param langCode e.g. en or en-US
* @throws IllegalArgumentException if the language is not supported or if the language code is invalid
* @since 3.6
*/
public static Language getLanguageForShortCode(String langCode) {
Language language = getLanguageForShortCodeOrNull(langCode);
if (language == null) {
List codes = new ArrayList<>();
for (Language realLanguage : LANGUAGES) {
codes.add(realLanguage.getShortCodeWithCountryAndVariant());
}
Collections.sort(codes);
throw new IllegalArgumentException("'" + langCode + "' is not a language code known to LanguageTool." +
" Supported language codes are: " + String.join(", ", codes) + ". The list of languages is read from " + PROPERTIES_PATH +
" in the Java classpath. See http://wiki.languagetool.org/java-api for details.");
}
return language;
}
/**
* Return whether a language with the given language code is supported. Which languages
* are supported depends on the classpath when the {@code Language} object is initialized.
* @param langCode e.g. {@code en} or {@code en-US}
* @return true if the language is supported
* @throws IllegalArgumentException in some cases of an invalid language code format
*/
public static boolean isLanguageSupported(String langCode) {
return getLanguageForShortCodeOrNull(langCode) != null;
}
/**
* Get the best match for a locale, using American English as the final fallback if nothing
* else fits. The returned language will be a country variant language (e.g. British English, not just English)
* if available.
* @throws RuntimeException if no language was found and American English as a fallback is not available
*/
public static Language getLanguageForLocale(Locale locale) {
Language language = getLanguageForLanguageNameAndCountry(locale);
if (language != null) {
return language;
} else {
Language firstFallbackLanguage = getLanguageForLanguageNameOnly(locale);
if (firstFallbackLanguage != null) {
return firstFallbackLanguage;
}
}
for (Language aLanguage : LANGUAGES) {
if (aLanguage.getShortCodeWithCountryAndVariant().equals("en-US")) {
return aLanguage;
}
}
throw new RuntimeException("No appropriate language found, not even en-US. Supported languages: " + get());
}
@Nullable
private static Language getLanguageForShortCodeOrNull(String langCode) {
StringTools.assureSet(langCode, "langCode");
Language result = null;
if (langCode.contains("-x-")) {
// e.g. "de-DE-x-simple-language"
for (Language element : LANGUAGES) {
if (element.getShortCode().equalsIgnoreCase(langCode)) {
return element;
}
}
} else if (langCode.contains("-")) {
String[] parts = langCode.split("-");
if (parts.length == 2) { // e.g. en-US
for (Language element : LANGUAGES) {
if (parts[0].equalsIgnoreCase(element.getShortCode())
&& element.getCountries().length == 1
&& parts[1].equalsIgnoreCase(element.getCountries()[0])) {
result = element;
break;
}
}
} else if (parts.length == 3) { // e.g. ca-ES-valencia
for (Language element : LANGUAGES) {
if (parts[0].equalsIgnoreCase(element.getShortCode())
&& element.getCountries().length == 1
&& parts[1].equalsIgnoreCase(element.getCountries()[0])
&& parts[2].equalsIgnoreCase(element.getVariant())) {
result = element;
break;
}
}
} else {
throw new IllegalArgumentException("'" + langCode + "' isn't a valid language code");
}
} else {
for (Language element : LANGUAGES) {
if (langCode.equalsIgnoreCase(element.getShortCode())) {
result = element;
/* TODO: It should return the DefaultLanguageVariant,
* not the first language found */
break;
}
}
}
return result;
}
@Nullable
private static Language getLanguageForLanguageNameAndCountry(Locale locale) {
for (Language language : LANGUAGES) {
if (language.getShortCode().equals(locale.getLanguage())) {
List countryVariants = Arrays.asList(language.getCountries());
if (countryVariants.contains(locale.getCountry())) {
return language;
}
}
}
return null;
}
@Nullable
private static Language getLanguageForLanguageNameOnly(Locale locale) {
// use default variant if available:
for (Language language : LANGUAGES) {
if (language.getShortCode().equals(locale.getLanguage()) && language.hasVariant()) {
Language defaultVariant = language.getDefaultLanguageVariant();
if (defaultVariant != null) {
return defaultVariant;
}
}
}
// use the first match otherwise (which should be the only match):
for (Language language : LANGUAGES) {
if (language.getShortCode().equals(locale.getLanguage()) && !language.hasVariant()) {
return language;
}
}
return null;
}
}