Implement tern server with nashorn. See

#33

core/tern.server.nashorn/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
+	<classpathentry kind="src" path="src/"/>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>

core/tern.server.nashorn/.gitignore

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+/bin
+/target

core/tern.server.nashorn/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>tern.server.nashorn</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.ManifestBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.SchemaBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+		<nature>org.eclipse.pde.PluginNature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

core/tern.server.nashorn/META-INF/MANIFEST.MF

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+Manifest-Version: 1.0
+Bundle-ManifestVersion: 2
+Bundle-Name: %pluginName
+Bundle-Vendor: %providerName
+Bundle-Localization: plugin
+Bundle-SymbolicName: tern.server.nashorn;singleton:=true
+Bundle-Version: 1.1.0.qualifier
+Bundle-RequiredExecutionEnvironment: JavaSE-1.8
+Require-Bundle: tern.core
+Bundle-ClassPath: .
+Import-Package: com.eclipsesource.json;version="[0.9.4,0.9.5)",
+ com.eclipsesource.v8,
+ com.eclipsesource.v8.utils,
+ org.osgi.framework
+Bundle-ActivationPolicy: lazy
+Bundle-Activator: tern.server.nashorn.Activator
+Export-Package: tern.server.nashorn

core/tern.server.nashorn/README.md

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+tern.server.nashorn
+=========
+
+[tern.server.nashorn](https://github.com/angelozerr/tern.java/tree/master/core/tern.server.nashorn) is a tern server implementation based on nashorn.
+
+## Sample with SWT
+
+[tern.eclipse.swt.samples](https://github.com/angelozerr/tern.java/tree/master/eclipse/tern.eclipse.swt.samples) provides a sample with a simple SWT Text & the Nashorn tern server implementation. To use it : 
+
+* import the following projects in your workspace :
+
+ * the Nashorn bundle according your OS. If you have Windows 64 bits you can use https://github.com/angelozerr/tern.java/tree/master/thirdparties/nashorn/nashorn_win32_x86_64
+ * minimal-json. You can find it at https://github.com/angelozerr/tern.java/tree/master/thirdparties/minimal-json
+ * tern.core
+ * tern.eclipse
+ * tern.eclipse.swt.samples
+ * tern.server.nashorn
+ * ternjs
+
+* Run the main https://github.com/angelozerr/tern.java/blob/master/eclipse/tern.eclipse.swt.samples/src/tern/eclipse/swt/samples/nashorn/NashornTernEditor.java
+
+You can play with Ctrl+Space to open tern completion :
+
+![SWT Tern Editor](https://github.com/angelozerr/tern.java/wiki/images/SWTTernEditor.png)
+
+
+# Nashorn Integration
+
+* no need to implement require AMD function, because ternjs is able to execute without node.js inside Web Browser. The Nashorn tern server implementation works like if ternjs was executed in a Web Browser.
+
+* don't use V80bject because we need every time release it. I have just use String (which follows JSON format) for tern request/response.   
+
+* implement basic console.log. I think Nashorn should provide that.
+
+# Limitation
+
+* not tested, but is it working if there are several Nashorn tern server (several v8 instances)? Because in Eclipse IDE, there are a tern server per Eclipse project.
+* some tern plugin requires **require** node function to support their features like : 
+
+ * the **node** tern plugin which uses require to retrieve list of node module by completion inside require.
+* tern-closure which works only in node.js context
+* I will implement soon angular completion for templateUrl which will use require('fs') to retrieve list of HTML files.
+
+# TODO
+
+* clean code!
+* integrate the thern server Nashorn inside Eclipse IDE 

core/tern.server.nashorn/build.properties

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+source.. = src/
+output.. = bin/
+bin.includes = META-INF/,\
+               .,\
+               plugin.properties

core/tern.server.nashorn/plugin.properties

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+###############################################################################
+# Copyright (c) 2013 Angelo Zerr and others.
+# 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:
+#     Angelo Zerr <angelo.zerr@gmail.com> - Initial API and implementation 
+###############################################################################
+pluginName=Tern - Server - Nashorn
+providerName=Angelo ZERR

core/tern.server.nashorn/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<artifactId>tern.server.nashorn</artifactId>
+	<packaging>eclipse-plugin</packaging>
+	<parent>
+		<groupId>fr.opensagres.js</groupId>
+		<artifactId>core</artifactId>
+		<version>1.1.0-SNAPSHOT</version>
+	</parent>
+</project>

core/tern.server.nashorn/src/tern/server/nashorn/Activator.java

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+/**
+ *  Copyright (c) 2013-2014 Angelo ZERR.
+ *  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:
+ *  Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation
+ */
+package tern.server.nashorn;
+
+import org.osgi.framework.BundleActivator;
+import org.osgi.framework.BundleContext;
+
+public class Activator implements BundleActivator {
+
+	public static final String PLUGIN_ID = "tern.server.nashorn";
+
+	private static BundleContext context;
+
+	static BundleContext getContext() {
+		return context;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext
+	 * )
+	 */
+	public void start(BundleContext bundleContext) throws Exception {
+		Activator.context = bundleContext;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
+	 */
+	public void stop(BundleContext bundleContext) throws Exception {
+		Activator.context = null;
+	}
+
+}

core/tern.server.nashorn/src/tern/server/nashorn/NashornTernServer.java

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+/**
+ *  Copyright (c) 2013-2015 Angelo ZERR.
+ *  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:
+ *  Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation
+ */
+package tern.server.nashorn;
+
+import java.util.List;
+
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+import javax.script.ScriptException;
+
+import com.eclipsesource.json.Json;
+import com.eclipsesource.json.JsonObject;
+
+import tern.ITernProject;
+import tern.TernException;
+import tern.server.AbstractScriptEngineTernServer;
+import tern.server.IResponseHandler;
+import tern.server.protocol.IJSONObjectHelper;
+import tern.server.protocol.MinimalJSONHelper;
+import tern.server.protocol.TernDoc;
+import tern.server.protocol.html.ScriptTagRegion;
+import tern.utils.IOUtils;
+
+/**
+ * Tern server implemented with Nashorn.
+ * 
+ */
+public class NashornTernServer extends AbstractScriptEngineTernServer {
+
+	private ScriptEngine engine;
+
+	public NashornTernServer(ITernProject project) {
+		super(project);
+	}
+
+	@Override
+	public void addFile(String name, String text, ScriptTagRegion[] tags) {
+		TernDoc doc = new TernDoc();
+		doc.addFile(name, text, tags, null);
+		try {
+			request(doc);
+		} catch (TernException e) {
+			e.printStackTrace();
+		}
+	}
+
+	@Override
+	public void request(TernDoc doc, IResponseHandler handler) {
+		try {
+			JsonObject data = request(doc);
+			handler.onSuccess(data, null);
+		} catch (Exception e) {
+			handler.onError(e.getMessage(), e);
+		}
+	}
+
+	private synchronized JsonObject request(TernDoc doc) throws TernException {
+		ScriptEngine engine = getEngine();
+		try {
+			String script = new StringBuilder("server.request(").append(doc.toString()).append(");").toString();
+			String json = (String) engine.eval(script);
+			return Json.parse(json).asObject();
+		} catch (Throwable e) {
+			throw new TernException(e);
+		}
+	}
+
+	@Override
+	public IJSONObjectHelper getJSONObjectHelper() {
+		return MinimalJSONHelper.INSTANCE;
+	}
+
+	@Override
+	protected void doDispose() {
+		if (engine != null) {
+			try {
+
+			} finally {
+				engine = null;
+			}
+		}
+		fireEndServer();
+	}
+
+	public void log(String message, Integer level) {
+		if (level == 1) {
+			System.err.println(message);
+		} else {
+			System.out.println(message);
+		}
+	}
+
+	private synchronized ScriptEngine getEngine() throws TernException {
+		if (engine == null) {
+			engine = loadEngine();
+		}
+		return engine;
+	}
+
+	private ScriptEngine loadEngine() throws TernException {
+		ScriptEngine engine = null;
+		TernResources resources = loadTern();
+		try {
+			final ScriptEngineManager factory = new ScriptEngineManager();
+			engine = factory.getEngineByName("nashorn");
+
+			// Load tern scripts (acorn + ternjs) + plugins scripts
+			List<TernResource> scripts = resources.getScripts();
+			for (TernResource script : scripts) {
+				eval(script.getFilename(), script.getContent(), engine);
+			}
+			// Get defs
+			String defs = resources.getDefsAsString();
+
+			// invocable.(this, "log", "_javaConsole", new Class<?>[] {
+			// String.class, Integer.class });
+			eval("tern-nashorn.js", IOUtils.toString(NashornTernServer.class.getResourceAsStream("tern-nashorn.js")),
+					engine);
+
+			StringBuilder script = new StringBuilder("var server = new J2V8TernServer(");
+			script.append("[");
+			script.append(defs.toString());
+			script.append("],");
+			script.append(getProject().getPlugins() != null ? getProject().getPlugins().toString() : "");
+			script.append(");");
+			eval("init.js", script.toString(), engine);
+			return engine;
+		} catch (Exception e) {
+			throw new TernException(e);
+		}
+	}
+
+	private static void eval(String filename, String content, ScriptEngine engine) throws ScriptException {
+		engine.put(ScriptEngine.FILENAME, filename);
+		engine.eval(content);
+	}
+
+}