| /* |
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| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
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| * 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 |
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| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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| * accompanied this code). |
| * |
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| |
| /** |
| * Provides the implementation of Nashorn script engine and |
| * the runtime environment for programs written in ECMAScript 5.1. |
| * <p> |
| * Nashorn is a runtime environment for programs written in ECMAScript 5.1. |
| * </p> |
| * |
| * <h1>Usage</h1> |
| * |
| * The recommended way to use Nashorn is through the |
| * <a href="http://jcp.org/en/jsr/detail?id=223" target="_top">JSR-223 |
| * "Scripting for the Java Platform"</a> APIs found in the |
| * {@link javax.script} package. Usually, you'll obtain a |
| * {@link javax.script.ScriptEngine} instance for Nashorn using: |
| * <pre> |
| import javax.script.*; |
| ... |
| ScriptEngine nashornEngine = new ScriptEngineManager().getEngineByName("nashorn"); |
| </pre> |
| * |
| * and then use it just as you would any other JSR-223 script engine. See |
| * <a href="jdk/nashorn/api/scripting/package-summary.html"> |
| * {@code jdk.nashorn.api.scripting}</a> package for details. |
| * <h1>Compatibility</h1> |
| * Nashorn is 100% compliant with the |
| * <a href="http://www.ecma-international.org/publications/standards/Ecma-262.htm" |
| * target="_top">ECMA-262 Standard, Edition 5.1</a>. |
| * It requires a Java Virtual Machine that implements the |
| * <a href="http://jcp.org/en/jsr/detail?id=292" target="_top"> |
| * JSR-292 "Supporting Dynamically Typed Languages on the Java Platform"</a> |
| * specification (often referred to as "invokedynamic"), as well as |
| * the already mentioned JSR-223. |
| * |
| * <h1>Interoperability with the Java platform</h1> |
| * |
| * In addition to being a 100% ECMAScript 5.1 runtime, Nashorn provides features |
| * for interoperability of the ECMAScript programs with the Java platform. |
| * In general, any Java object put into the script engine's context will be |
| * visible from the script. In terms of the standard, such Java objects are not |
| * considered "native objects", but rather "host objects", as defined in |
| * section 4.3.8. This distinction allows certain semantical differences |
| * in handling them compared to native objects. For most purposes, Java objects |
| * behave just as native objects do: you can invoke their methods, get and set |
| * their properties. In most cases, though, you can't add arbitrary properties |
| * to them, nor can you remove existing properties. |
| * |
| * <h2>Java collection handling</h2> |
| * |
| * Native Java arrays and {@link java.util.List}s support indexed access to |
| * their elements through the property accessors, and {@link java.util.Map}s |
| * support both property and element access through both dot and square-bracket |
| * property accessors, with the difference being that dot operator gives |
| * precedence to object properties (its fields and properties defined as |
| * {@code getXxx} and {@code setXxx} methods) while the square bracket |
| * operator gives precedence to map elements. Native Java arrays expose |
| * the {@code length} property. |
| * |
| * <h2>ECMAScript primitive types</h2> |
| * |
| * ECMAScript primitive types for number, string, and boolean are represented |
| * with {@link java.lang.Number}, {@link java.lang.CharSequence}, and |
| * {@link java.lang.Boolean} objects. While the most often used number type |
| * is {@link java.lang.Double} and the most often used string type is |
| * {@link java.lang.String}, don't rely on it as various internal optimizations |
| * cause other subclasses of {@code Number} and internal implementations of |
| * {@code CharSequence} to be used. |
| * |
| * <h2>Type conversions</h2> |
| * |
| * When a method on a Java object is invoked, the arguments are converted to |
| * the formal parameter types of the Java method using all allowed ECMAScript |
| * conversions. This can be surprising, as in general, conversions from string |
| * to number will succeed according to Standard's section 9.3 "ToNumber" |
| * and so on; string to boolean, number to boolean, Object to number, |
| * Object to string all work. Note that if the Java method's declared parameter |
| * type is {@code java.lang.Object}, Nashorn objects are passed without any |
| * conversion whatsoever; specifically if the JavaScript value being passed |
| * is of primitive string type, you can only rely on it being a |
| * {@code java.lang.CharSequence}, and if the value is a number, you can only |
| * rely on it being a {@code java.lang.Number}. If the Java method declared |
| * parameter type is more specific (e.g. {@code java.lang.String} or |
| * {@code java.lang.Double}), then Nashorn will of course ensure |
| * the required type is passed. |
| * |
| * <h2>SAM types</h2> |
| * |
| * As a special extension when invoking Java methods, ECMAScript function |
| * objects can be passed in place of an argument whose Java type is so-called |
| * "single abstract method" or "SAM" type. While this name usually covers |
| * single-method interfaces, Nashorn is a bit more versatile, and it |
| * recognizes a type as a SAM type if all its abstract methods are |
| * overloads of the same name, and it is either an interface, or it is an |
| * abstract class with a no-arg constructor. The type itself must be public, |
| * while the constructor and the methods can be either public or protected. |
| * If there are multiple abstract overloads of the same name, the single |
| * function will serve as the shared implementation for all of them, |
| * <em>and additionally it will also override any non-abstract methods of |
| * the same name</em>. This is done to be consistent with the fact that |
| * ECMAScript does not have the concept of overloaded methods. |
| * |
| * <h2>The {@code Java} object</h2> |
| * |
| * Nashorn exposes a non-standard global object named {@code Java} that is |
| * the primary API entry point into Java platform-specific functionality. |
| * You can use it to create instances of Java classes, convert from Java arrays |
| * to native arrays and back, and so on. |
| * |
| * <h2>Other non-standard built-in objects</h2> |
| * |
| * In addition to {@code Java}, Nashorn also exposes some other |
| * non-standard built-in objects: |
| * {@code JSAdapter}, {@code JavaImporter}, {@code Packages} |
| * |
| * @provides javax.script.ScriptEngineFactory |
| * @moduleGraph |
| * @since 9 |
| */ |
| module jdk.scripting.nashorn { |
| requires java.logging; |
| requires jdk.dynalink; |
| |
| requires transitive java.scripting; |
| |
| exports jdk.nashorn.api.scripting; |
| exports jdk.nashorn.api.tree; |
| |
| exports jdk.nashorn.internal.runtime to |
| jdk.scripting.nashorn.shell; |
| exports jdk.nashorn.internal.objects to |
| jdk.scripting.nashorn.shell; |
| exports jdk.nashorn.tools to |
| jdk.scripting.nashorn.shell; |
| |
| provides javax.script.ScriptEngineFactory with |
| jdk.nashorn.api.scripting.NashornScriptEngineFactory; |
| |
| provides jdk.dynalink.linker.GuardingDynamicLinkerExporter with |
| jdk.nashorn.api.linker.NashornLinkerExporter; |
| } |