Add default language descriptions set

wsagent/che-core-api-languageserver/src/main/java/org/eclipse/che/api/languageserver/LanguageServerModule.java

@@ -17,6 +17,8 @@
 import org.eclipse.che.api.languageserver.messager.PublishDiagnosticsParamsJsonRpcTransmitter;
 import org.eclipse.che.api.languageserver.messager.ShowMessageJsonRpcTransmitter;
 import org.eclipse.che.api.languageserver.registry.CheLanguageClientFactory;
+import org.eclipse.che.api.languageserver.registry.DefaultLanguageRecognizer;
+import org.eclipse.che.api.languageserver.registry.LanguageRecognizer;
 import org.eclipse.che.api.languageserver.registry.LanguageServerFileWatcher;
 import org.eclipse.che.api.languageserver.registry.LanguageServerRegistry;
 import org.eclipse.che.api.languageserver.registry.LanguageServerRegistryImpl;
@@ -35,6 +37,7 @@ public class LanguageServerModule extends AbstractModule {
   protected void configure() {
     install(new LsRemoteModule());
 
+    bind(LanguageRecognizer.class).to(DefaultLanguageRecognizer.class);
     bind(LanguageServerRegistry.class).to(LanguageServerRegistryImpl.class);
     bind(ServerInitializer.class).to(ServerInitializerImpl.class);
     bind(LanguageRegistryService.class);

wsagent/che-core-api-languageserver/src/main/java/org/eclipse/che/api/languageserver/registry/DefaultLanguageRecognizer.java

@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2012-2018 Red Hat, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *   Red Hat, Inc. - initial API and implementation
+ */
+package org.eclipse.che.api.languageserver.registry;
+
+import static org.eclipse.che.api.fs.server.WsPathUtils.nameOf;
+
+import java.util.Set;
+import javax.inject.Inject;
+import javax.inject.Singleton;
+import org.eclipse.che.api.languageserver.shared.model.LanguageDescription;
+
+/**
+ * Language recognizer based on default language set. Custom language descriptions created that are
+ * injected by guice are taken into account prior to default language set. Language recognition is
+ * based on file name or file extension, so may be improved further in future.
+ */
+@Singleton
+public class DefaultLanguageRecognizer implements LanguageRecognizer {
+
+  private final Set<LanguageDescription> languages;
+  private final DefaultLanguages defaultLanguages;
+
+  @Inject
+  public DefaultLanguageRecognizer(
+      Set<LanguageDescription> languages, DefaultLanguages defaultLanguages) {
+    this.languages = languages;
+    this.defaultLanguages = defaultLanguages;
+  }
+
+  @Override
+  public LanguageDescription recognizeByPath(String wsPath) {
+    Name name = new Name(wsPath);
+    Extension extension = new Extension(wsPath);
+
+    for (LanguageDescription language : languages) {
+      if (name.matches(language) || extension.matches(language)) {
+        return language;
+      }
+    }
+
+    for (LanguageDescription language : defaultLanguages.getAll()) {
+      if (name.matches(language) || extension.matches(language)) {
+        return language;
+      }
+    }
+
+    return UNIDENTIFIED;
+  }
+
+  @Override
+  public LanguageDescription recognizeById(String id) {
+    for (LanguageDescription language : languages) {
+      if (language.getLanguageId().equals(id)) {
+        return language;
+      }
+    }
+
+    for (LanguageDescription language : defaultLanguages.getAll()) {
+      if (language.getLanguageId().equals(id)) {
+        return language;
+      }
+    }
+
+    return UNIDENTIFIED;
+  }
+
+  private static class Name {
+    private final String name;
+
+    private Name(String wsPath) {
+      String nameAndExtension = nameOf(wsPath);
+      int lastDotIndex = nameAndExtension.lastIndexOf('.');
+
+      this.name = lastDotIndex < 0 ? nameAndExtension : nameAndExtension.substring(0, lastDotIndex);
+    }
+
+    private boolean matches(LanguageDescription languageDescription) {
+      return languageDescription.getFileNames().contains(name);
+    }
+  }
+
+  private static class Extension {
+    private final String extension;
+
+    private Extension(String wsPath) {
+      String nameAndExtension = nameOf(wsPath);
+      int lastDotIndex = nameAndExtension.lastIndexOf('.');
+
+      this.extension = lastDotIndex < 0 ? "" : nameAndExtension.substring(lastDotIndex + 1);
+    }
+
+    private boolean matches(LanguageDescription languageDescription) {
+      return languageDescription.getFileExtensions().contains(extension);
+    }
+  }
+}

wsagent/che-core-api-languageserver/src/main/java/org/eclipse/che/api/languageserver/registry/DefaultLanguages.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2012-2018 Red Hat, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *   Red Hat, Inc. - initial API and implementation
+ */
+package org.eclipse.che.api.languageserver.registry;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+import javax.inject.Singleton;
+import org.eclipse.che.api.languageserver.shared.model.LanguageDescription;
+
+/** Contains set of default language descriptions */
+@Singleton
+public class DefaultLanguages {
+
+  private final Set<LanguageDescription> languages = new HashSet<>();
+
+  public DefaultLanguages() {
+    register("bat", "bat", "text/plain");
+    register("bibtex", "bib", "text/plain");
+    register("clojure", "clj", "text/x-clojure");
+    register("coffeescript", "coffee", "text/x-coffeescript");
+    register("c", "c", "text/x-csrc");
+    register("cpp", "cpp", "text/x-c++src");
+    register("csharp", "cs", "text/x-csharp");
+    register("css", "css", "text/css");
+    register("diff", "diff", "text/x-diff");
+    register("fsharp", "fs", "text/x-fsharp");
+    register("go", "go", "text/x-go");
+    register("groovy", "groovy", "text/x-groovy");
+    register("handlebars", "hbs", "text/plain");
+    register("html", "html", "text/html");
+    register("ini", "ini", "text/plain");
+    register("jade", "jade", "text/x-jade");
+    register("java", "java", "text/x-java");
+    register("javascript", "js", "text/javascript");
+    register("json", "json", "application/json");
+    register("scala", "scala", "text/x-scala");
+    register("kt", "kotlin", "text/x-kotlin");
+    register("latex", "tex", "text/x-latex");
+    register("lisp", "lisp", "text/x-commonlisp");
+    register("lua", "lua", "text/x-lua");
+    register("makefile", "Makefile", "text/plain");
+    register("markdown", "markdown", "text/x-markdown");
+    register("objective-c", "m", "text/x-objective-c");
+    register("objective-cpp", "mm", "text/x-objective-cpp");
+    register("perl", "pl", "text/x-perl");
+    register("php", "php", "text/x-php");
+    register("powershell", "ps1", "text/plain");
+    register("pascal", "pas", "text/x-pascal");
+    register("python", "py", "text/x-python");
+    register("r", "r", "text/x-rsrc");
+    register("ruby", "rb", "text/x-ruby");
+    register("rust", "rs", "text/x-rustsrc");
+    register("shellscript", "sh", "text/x-sh");
+    register("sql", "sql", "text/x-sql");
+    register("swift", "swift", "text/x-swift");
+    register("typescript", "ts", "application/typescript");
+    register("xml", "xml", "application/xml");
+    register("xsl", "xsl", "text/plain");
+    register("yaml", "yaml", "text/x-yaml");
+
+    registerWithName("dockerfile", "Dockerfile", "text/x-dockerfile");
+  }
+
+  public Set<LanguageDescription> getAll() {
+    return Collections.unmodifiableSet(languages);
+  }
+
+  private void register(String id, String extension, String mimeType) {
+    LanguageDescription languageDescription = new LanguageDescription();
+    languageDescription.setLanguageId(id);
+    languageDescription.setMimeType(mimeType);
+    languageDescription.setFileExtensions(Collections.singletonList(extension));
+    languages.add(languageDescription);
+  }
+
+  private void registerWithName(String id, String fileName, String mimeType) {
+    LanguageDescription languageDescription = new LanguageDescription();
+    languageDescription.setLanguageId(id);
+    languageDescription.setMimeType(mimeType);
+    languageDescription.setFileNames(Collections.singletonList(fileName));
+    languages.add(languageDescription);
+  }
+}

wsagent/che-core-api-languageserver/src/main/java/org/eclipse/che/api/languageserver/registry/LanguageRecognizer.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2012-2018 Red Hat, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *   Red Hat, Inc. - initial API and implementation
+ */
+package org.eclipse.che.api.languageserver.registry;
+
+import org.eclipse.che.api.languageserver.shared.model.LanguageDescription;
+
+/**
+ * The implementations of this interface are responsible for language recognition of a file under
+ * defined path.
+ */
+public interface LanguageRecognizer {
+  LanguageDescription UNIDENTIFIED =
+      new LanguageDescription() {
+        @Override
+        public String getLanguageId() {
+          return "unidentified";
+        }
+
+        @Override
+        public String getMimeType() {
+          return "";
+        }
+
+        @Override
+        public String getHighlightingConfiguration() {
+          return "";
+        }
+      };
+
+  /**
+   * Recognize a language by file path. If language cannot be recognized for any reason than the
+   * implementation must return {@link LanguageRecognizer#UNIDENTIFIED}.
+   *
+   * @param wsPath workspace path of a file
+   * @return description of language that was recognized
+   */
+  LanguageDescription recognizeByPath(String wsPath);
+
+  /**
+   * Recognize a language by it's identifier. If language cannot be recognized for any reason than
+   * the implementation must return {@link LanguageRecognizer#UNIDENTIFIED}.
+   *
+   * @param id language identifier
+   * @return description of language that was recognized
+   */
+  LanguageDescription recognizeById(String id);
+}