src/jdk/nashorn/api/scripting/NashornScriptEngineFactory.java - platform/external/jetbrains/jdk8u_nashorn - Git at Google

 /*
  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code 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 General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 package jdk.nashorn.api.scripting;

 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.Objects;
 import javax.script.ScriptEngine;
 import javax.script.ScriptEngineFactory;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.Version;

 /**
  * JSR-223 compliant script engine factory for Nashorn. The engine answers for:
  * <ul>
  * <li>names {@code "nashorn"}, {@code "Nashorn"}, {@code "js"}, {@code "JS"}, {@code "JavaScript"},
  * {@code "javascript"}, {@code "ECMAScript"}, and {@code "ecmascript"};</li>
  * <li>MIME types {@code "application/javascript"}, {@code "application/ecmascript"}, {@code "text/javascript"}, and
  * {@code "text/ecmascript"};</li>
  * <li>as well as for the extension {@code "js"}.</li>
  * </ul>
  * Programs executing in engines created using {@link #getScriptEngine(String[])} will have the passed arguments
  * accessible as a global variable named {@code "arguments"}.
  *
  * @since 1.8u40
  */
 @jdk.Exported
 public final class NashornScriptEngineFactory implements ScriptEngineFactory {
     @Override
     public String getEngineName() {
         return (String) getParameter(ScriptEngine.ENGINE);
     }

     @Override
     public String getEngineVersion() {
         return (String) getParameter(ScriptEngine.ENGINE_VERSION);
     }

     @Override
     public List<String> getExtensions() {
         return Collections.unmodifiableList(extensions);
     }

     @Override
     public String getLanguageName() {
         return (String) getParameter(ScriptEngine.LANGUAGE);
     }

     @Override
     public String getLanguageVersion() {
         return (String) getParameter(ScriptEngine.LANGUAGE_VERSION);
     }

     @Override
     public String getMethodCallSyntax(final String obj, final String method, final String... args) {
         final StringBuilder sb = new StringBuilder().append(obj).append('.').append(method).append('(');
         final int len = args.length;

         if (len > 0) {
             sb.append(args[0]);
         }
         for (int i = 1; i < len; i++) {
             sb.append(',').append(args[i]);
         }
         sb.append(')');

         return sb.toString();
     }

     @Override
     public List<String> getMimeTypes() {
         return Collections.unmodifiableList(mimeTypes);
     }

     @Override
     public List<String> getNames() {
         return Collections.unmodifiableList(names);
     }

     @Override
     public String getOutputStatement(final String toDisplay) {
         return "print(" + toDisplay + ")";
     }

     @Override
     public Object getParameter(final String key) {
         switch (key) {
         case ScriptEngine.NAME:
             return "javascript";
         case ScriptEngine.ENGINE:
             return "Oracle Nashorn";
         case ScriptEngine.ENGINE_VERSION:
             return Version.version();
         case ScriptEngine.LANGUAGE:
             return "ECMAScript";
         case ScriptEngine.LANGUAGE_VERSION:
             return "ECMA - 262 Edition 5.1";
         case "THREADING":
             // The engine implementation is not thread-safe. Can't be
             // used to execute scripts concurrently on multiple threads.
             return null;
         default:
             return null;
         }
     }

     @Override
     public String getProgram(final String... statements) {
         final StringBuilder sb = new StringBuilder();

         for (final String statement : statements) {
             sb.append(statement).append(';');
         }

         return sb.toString();
     }

     // default options passed to Nashorn script engine
     private static final String[] DEFAULT_OPTIONS = new String[] { "-doe" };

     @Override
     public ScriptEngine getScriptEngine() {
         try {
             return new NashornScriptEngine(this, DEFAULT_OPTIONS, getAppClassLoader(), null);
         } catch (final RuntimeException e) {
             if (Context.DEBUG) {
                 e.printStackTrace();
             }
             throw e;
         }
     }

     /**
      * Create a new Script engine initialized with the given class loader.
      *
      * @param appLoader class loader to be used as script "app" class loader.
      * @return newly created script engine.
      * @throws SecurityException
      *         if the security manager's {@code checkPermission}
      *         denies {@code RuntimePermission("nashorn.setConfig")}
      */
     public ScriptEngine getScriptEngine(final ClassLoader appLoader) {
         return newEngine(DEFAULT_OPTIONS, appLoader, null);
     }

     /**
      * Create a new Script engine initialized with the given class filter.
      *
      * @param classFilter class filter to use.
      * @return newly created script engine.
      * @throws NullPointerException if {@code classFilter} is {@code null}
      * @throws SecurityException
      *         if the security manager's {@code checkPermission}
      *         denies {@code RuntimePermission("nashorn.setConfig")}
      */
     public ScriptEngine getScriptEngine(final ClassFilter classFilter) {
         return newEngine(DEFAULT_OPTIONS, getAppClassLoader(), Objects.requireNonNull(classFilter));
     }

     /**
      * Create a new Script engine initialized with the given arguments.
      *
      * @param args arguments array passed to script engine.
      * @return newly created script engine.
      * @throws NullPointerException if {@code args} is {@code null}
      * @throws SecurityException
      *         if the security manager's {@code checkPermission}
      *         denies {@code RuntimePermission("nashorn.setConfig")}
      */
     public ScriptEngine getScriptEngine(final String... args) {
         return newEngine(Objects.requireNonNull(args), getAppClassLoader(), null);
     }

     /**
      * Create a new Script engine initialized with the given arguments and the given class loader.
      *
      * @param args arguments array passed to script engine.
      * @param appLoader class loader to be used as script "app" class loader.
      * @return newly created script engine.
      * @throws NullPointerException if {@code args} is {@code null}
      * @throws SecurityException
      *         if the security manager's {@code checkPermission}
      *         denies {@code RuntimePermission("nashorn.setConfig")}
      */
     public ScriptEngine getScriptEngine(final String[] args, final ClassLoader appLoader) {
         return newEngine(Objects.requireNonNull(args), appLoader, null);
     }

     /**
      * Create a new Script engine initialized with the given arguments, class loader and class filter.
      *
      * @param args arguments array passed to script engine.
      * @param appLoader class loader to be used as script "app" class loader.
      * @param classFilter class filter to use.
      * @return newly created script engine.
      * @throws NullPointerException if {@code args} or {@code classFilter} is {@code null}
      * @throws SecurityException
      *         if the security manager's {@code checkPermission}
      *         denies {@code RuntimePermission("nashorn.setConfig")}
      */
     public ScriptEngine getScriptEngine(final String[] args, final ClassLoader appLoader, final ClassFilter classFilter) {
         return newEngine(Objects.requireNonNull(args), appLoader, Objects.requireNonNull(classFilter));
     }

     private ScriptEngine newEngine(final String[] args, final ClassLoader appLoader, final ClassFilter classFilter) {
         checkConfigPermission();
         try {
             return new NashornScriptEngine(this, args, appLoader, classFilter);
         } catch (final RuntimeException e) {
             if (Context.DEBUG) {
                 e.printStackTrace();
             }
             throw e;
         }
     }

     // -- Internals only below this point

     private static void checkConfigPermission() {
         final SecurityManager sm = System.getSecurityManager();
         if (sm != null) {
             sm.checkPermission(new RuntimePermission(Context.NASHORN_SET_CONFIG));
         }
     }

     private static final List<String> names;
     private static final List<String> mimeTypes;
     private static final List<String> extensions;

     static {
         names = immutableList(
                     "nashorn", "Nashorn",
                     "js", "JS",
                     "JavaScript", "javascript",
                     "ECMAScript", "ecmascript"
                 );

         mimeTypes = immutableList(
                         "application/javascript",
                         "application/ecmascript",
                         "text/javascript",
                         "text/ecmascript"
                     );

         extensions = immutableList("js");
     }

     private static List<String> immutableList(final String... elements) {
         return Collections.unmodifiableList(Arrays.asList(elements));
     }

     private static ClassLoader getAppClassLoader() {
         // Revisit: script engine implementation needs the capability to
         // find the class loader of the context in which the script engine
         // is running so that classes will be found and loaded properly
         final ClassLoader ccl = Thread.currentThread().getContextClassLoader();
         return (ccl == null)? NashornScriptEngineFactory.class.getClassLoader() : ccl;
     }
 }
	/*
	* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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 General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package jdk.nashorn.api.scripting;

	import java.util.Arrays;
	import java.util.Collections;
	import java.util.List;
	import java.util.Objects;
	import javax.script.ScriptEngine;
	import javax.script.ScriptEngineFactory;
	import jdk.nashorn.internal.runtime.Context;
	import jdk.nashorn.internal.runtime.Version;

	/**
	* JSR-223 compliant script engine factory for Nashorn. The engine answers for:
	* <ul>
	* <li>names {@code "nashorn"}, {@code "Nashorn"}, {@code "js"}, {@code "JS"}, {@code "JavaScript"},
	* {@code "javascript"}, {@code "ECMAScript"}, and {@code "ecmascript"};</li>
	* <li>MIME types {@code "application/javascript"}, {@code "application/ecmascript"}, {@code "text/javascript"}, and
	* {@code "text/ecmascript"};</li>
	* <li>as well as for the extension {@code "js"}.</li>
	* </ul>
	* Programs executing in engines created using {@link #getScriptEngine(String[])} will have the passed arguments
	* accessible as a global variable named {@code "arguments"}.
	*
	* @since 1.8u40
	*/
	@jdk.Exported
	public final class NashornScriptEngineFactory implements ScriptEngineFactory {
	@Override
	public String getEngineName() {
	return (String) getParameter(ScriptEngine.ENGINE);
	}

	@Override
	public String getEngineVersion() {
	return (String) getParameter(ScriptEngine.ENGINE_VERSION);
	}

	@Override
	public List<String> getExtensions() {
	return Collections.unmodifiableList(extensions);
	}

	@Override
	public String getLanguageName() {
	return (String) getParameter(ScriptEngine.LANGUAGE);
	}

	@Override
	public String getLanguageVersion() {
	return (String) getParameter(ScriptEngine.LANGUAGE_VERSION);
	}

	@Override
	public String getMethodCallSyntax(final String obj, final String method, final String... args) {
	final StringBuilder sb = new StringBuilder().append(obj).append('.').append(method).append('(');
	final int len = args.length;

	if (len > 0) {
	sb.append(args[0]);
	}
	for (int i = 1; i < len; i++) {
	sb.append(',').append(args[i]);
	}
	sb.append(')');

	return sb.toString();
	}

	@Override
	public List<String> getMimeTypes() {
	return Collections.unmodifiableList(mimeTypes);
	}

	@Override
	public List<String> getNames() {
	return Collections.unmodifiableList(names);
	}

	@Override
	public String getOutputStatement(final String toDisplay) {
	return "print(" + toDisplay + ")";
	}

	@Override
	public Object getParameter(final String key) {
	switch (key) {
	case ScriptEngine.NAME:
	return "javascript";
	case ScriptEngine.ENGINE:
	return "Oracle Nashorn";
	case ScriptEngine.ENGINE_VERSION:
	return Version.version();
	case ScriptEngine.LANGUAGE:
	return "ECMAScript";
	case ScriptEngine.LANGUAGE_VERSION:
	return "ECMA - 262 Edition 5.1";
	case "THREADING":
	// The engine implementation is not thread-safe. Can't be
	// used to execute scripts concurrently on multiple threads.
	return null;
	default:
	return null;
	}
	}

	@Override
	public String getProgram(final String... statements) {
	final StringBuilder sb = new StringBuilder();

	for (final String statement : statements) {
	sb.append(statement).append(';');
	}

	return sb.toString();
	}

	// default options passed to Nashorn script engine
	private static final String[] DEFAULT_OPTIONS = new String[] { "-doe" };

	@Override
	public ScriptEngine getScriptEngine() {
	try {
	return new NashornScriptEngine(this, DEFAULT_OPTIONS, getAppClassLoader(), null);
	} catch (final RuntimeException e) {
	if (Context.DEBUG) {
	e.printStackTrace();
	}
	throw e;
	}
	}

	/**
	* Create a new Script engine initialized with the given class loader.
	*
	* @param appLoader class loader to be used as script "app" class loader.
	* @return newly created script engine.
	* @throws SecurityException
	* if the security manager's {@code checkPermission}
	* denies {@code RuntimePermission("nashorn.setConfig")}
	*/
	public ScriptEngine getScriptEngine(final ClassLoader appLoader) {
	return newEngine(DEFAULT_OPTIONS, appLoader, null);
	}

	/**
	* Create a new Script engine initialized with the given class filter.
	*
	* @param classFilter class filter to use.
	* @return newly created script engine.
	* @throws NullPointerException if {@code classFilter} is {@code null}
	* @throws SecurityException
	* if the security manager's {@code checkPermission}
	* denies {@code RuntimePermission("nashorn.setConfig")}
	*/
	public ScriptEngine getScriptEngine(final ClassFilter classFilter) {
	return newEngine(DEFAULT_OPTIONS, getAppClassLoader(), Objects.requireNonNull(classFilter));
	}

	/**
	* Create a new Script engine initialized with the given arguments.
	*
	* @param args arguments array passed to script engine.
	* @return newly created script engine.
	* @throws NullPointerException if {@code args} is {@code null}
	* @throws SecurityException
	* if the security manager's {@code checkPermission}
	* denies {@code RuntimePermission("nashorn.setConfig")}
	*/
	public ScriptEngine getScriptEngine(final String... args) {
	return newEngine(Objects.requireNonNull(args), getAppClassLoader(), null);
	}

	/**
	* Create a new Script engine initialized with the given arguments and the given class loader.
	*
	* @param args arguments array passed to script engine.
	* @param appLoader class loader to be used as script "app" class loader.
	* @return newly created script engine.
	* @throws NullPointerException if {@code args} is {@code null}
	* @throws SecurityException
	* if the security manager's {@code checkPermission}
	* denies {@code RuntimePermission("nashorn.setConfig")}
	*/
	public ScriptEngine getScriptEngine(final String[] args, final ClassLoader appLoader) {
	return newEngine(Objects.requireNonNull(args), appLoader, null);
	}

	/**
	* Create a new Script engine initialized with the given arguments, class loader and class filter.
	*
	* @param args arguments array passed to script engine.
	* @param appLoader class loader to be used as script "app" class loader.
	* @param classFilter class filter to use.
	* @return newly created script engine.
	* @throws NullPointerException if {@code args} or {@code classFilter} is {@code null}
	* @throws SecurityException
	* if the security manager's {@code checkPermission}
	* denies {@code RuntimePermission("nashorn.setConfig")}
	*/
	public ScriptEngine getScriptEngine(final String[] args, final ClassLoader appLoader, final ClassFilter classFilter) {
	return newEngine(Objects.requireNonNull(args), appLoader, Objects.requireNonNull(classFilter));
	}

	private ScriptEngine newEngine(final String[] args, final ClassLoader appLoader, final ClassFilter classFilter) {
	checkConfigPermission();
	try {
	return new NashornScriptEngine(this, args, appLoader, classFilter);
	} catch (final RuntimeException e) {
	if (Context.DEBUG) {
	e.printStackTrace();
	}
	throw e;
	}
	}

	// -- Internals only below this point

	private static void checkConfigPermission() {
	final SecurityManager sm = System.getSecurityManager();
	if (sm != null) {
	sm.checkPermission(new RuntimePermission(Context.NASHORN_SET_CONFIG));
	}
	}

	private static final List<String> names;
	private static final List<String> mimeTypes;
	private static final List<String> extensions;

	static {
	names = immutableList(
	"nashorn", "Nashorn",
	"js", "JS",
	"JavaScript", "javascript",
	"ECMAScript", "ecmascript"
	);

	mimeTypes = immutableList(
	"application/javascript",
	"application/ecmascript",
	"text/javascript",
	"text/ecmascript"
	);

	extensions = immutableList("js");
	}

	private static List<String> immutableList(final String... elements) {
	return Collections.unmodifiableList(Arrays.asList(elements));
	}

	private static ClassLoader getAppClassLoader() {
	// Revisit: script engine implementation needs the capability to
	// find the class loader of the context in which the script engine
	// is running so that classes will be found and loaded properly
	final ClassLoader ccl = Thread.currentThread().getContextClassLoader();
	return (ccl == null)? NashornScriptEngineFactory.class.getClassLoader() : ccl;
	}
	}