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mozilla/js/rhino/org is now distributed between mozilla/js/rhino/src and mozilla/js/rhino/toolsrc. The build.xml has been split in three. Docs now live in the project directory. These changes mean that the cvs directories mirror the distribution and thus a distribution will build the same way as a cvs build.
163 lines
6.0 KiB
HTML
163 lines
6.0 KiB
HTML
<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="Author" content="Norris Boyd">
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<meta name="GENERATOR" content="Mozilla/4.72 [en]C-NSCP (WinNT; U) [Netscape]">
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<meta name="KeyWords" content="Rhino, JavaScript, Java">
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<title>What's New in Rhino 1.5</title>
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</head>
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<body bgcolor="#FFFFFF">
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<center>
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<h1>
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What's New in Rhino 1.5</h1></center>
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<h2>
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ECMA 262 Edition 3 Conformance</h2>
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Rhino 1.5 implements JavaScript 1.5, which conforms to ECMA 262 Edition
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3 (sometimes referred to as "ECMAScript"). Edition 3 standardized several
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features of JavaScript that were present in JavaScript 1.4, including:
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<ul>
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<li>
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regular expressions</li>
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<li>
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<tt>switch</tt> statements</li>
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<li>
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<tt>do</tt>...<tt>while</tt> loops</li>
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<li>
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statement labels and labelled <tt>break</tt> and <tt>continue</tt></li>
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<li>
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object literals</li>
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<li>
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nested functions</li>
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<li>
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exception handling</li>
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<li>
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the <tt>instanceof</tt> operator</li>
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<li>
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the <tt>in</tt> operator</li>
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</ul>
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In addition, new features were added to Edition 3 and JavaScript 1.5, including:
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<ul>
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<li>
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Perl 5 regular expressions, including operators like greedy quantifiers</li>
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<li>
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errors as exceptions</li>
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<li>
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number formatting (<tt>Number.prototype.toFixed</tt>, <tt>Number.prototype.toExponential</tt>,
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and <tt>Number.prototype.toGeneral</tt>)</li>
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</ul>
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<h2>
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Changes since Rhino 1.4 Release 3</h2>
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Other significant changes to Rhino since the initial release to open source
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(1.4 Release 3) are listed below. Bug fixes won't be mentioned here, just
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API changes or significant functionality changes.
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<h3>
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Compilation mode</h3>
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Rhino has two modes of execution available. Interpretive mode has an interpreter
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loop implemented in Java. Compilation mode compiles JavaScript code to
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Java bytecodes in class files. This compilation can be done as part of
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script evaluation using the same APIs already available for the interpreter,
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or in a separate compile-time step. The code for the interpreter is located
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in the <tt>org.mozilla.javascript.optimizer</tt> package.
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<br>
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<h3>
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JavaScript Compiler</h3>
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The distribution now contains an extra class that can be invoked from the
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command line. This is <tt>jsc</tt>, the JavaScript compiler. This tool
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can be used to create Java classes from JavaScript. Options exist to allow
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creation of Java classes that implement arbitrary interfaces and extend
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arbitrary base classes, allowing JavaScript scripts to implement important
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protocols like applets and servlets. See <a href="http://www.mozilla.org/rhino/jsc.html">http://www.mozilla.org/rhino/jsc.html</a>.
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<br>
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<h3>
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LiveConnect 3</h3>
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Rhino now supports the LiveConnect 3 specification, or LC3. The most notable
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change is support for overloaded method resolution. See <a href="http://www.mozilla.org/js/liveconnect/lc3_proposal.html">LiveConnect
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Release 3 Goals/Features</a>.
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<br>
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<h3>
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JavaBeans properties reflected as Java properties</h3>
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Java classes with getFoo/setFoo methods will have a "foo" property in the
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JavaScript reflection. Boolean methods are also reflected.
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<br>
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<h3>
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Dynamic scope support</h3>
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Rhino 1.5 implements support for dynamic scopes, which are particularly
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useful for multithreaded environments like server embeddings.
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<br>
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<h3>
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New semantics for <tt>ScriptableObject.defineClass</tt></h3>
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The old rules for defining JavaScript objects using a Java class were getting
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baroque. Those rules are still supported, but a cleaner definition is now
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supported. See the <a href="http://www.mozilla.org/js/rhino/org/mozilla/javascript/ScriptableObject.html#defineClass(org.mozilla.javascript.Scriptable, java.lang.Class)">javadoc</a>
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for details.
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<br>
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<h3>
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Support for the Java 2 <tt>-jar</tt> option</h3>
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It's now possible to start the shell using the new <tt>-jar</tt> option
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in Java 2.
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<br>
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<h3>
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Shell changes</h3>
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Two changes here: addition of the "environment" and "history" top-level
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variables.
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<br>
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<h3>
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Java classes visible to scripts</h3>
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An attendee at JavaOne raised the point that many embeddings may not want
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scripts to be able to access all Java classes. This is an excellent point,
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and I've implemented an addition to the <a href="../js/rhino/org/mozilla/javascript/SecuritySupport.html">SecuritySupport</a>
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interface that allows embedders to choose which classes are exposed to
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scripts.
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<br>
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<h3>
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SecuritySupport and JavaAdapter</h3>
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Andrew Wason pointed a problem with the new JavaAdapter feature (which
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allows JavaScript objects to implement arbitrary Java interfaces by generating
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class files). It didn't support the <a href="../js/rhino/org/mozilla/javascript/SecuritySupport.html">SecuritySupport</a>
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interface, which allows Rhino to delegate the creation of classes from
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byte arrays to a routine provided by the embedding. This ability is important
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from a security standpoint because class creation is considered a privileged
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action.
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<p>I've checked in changes that fix this problem. If a SecuritySupport
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class is specified when a Context is created, uses of JavaAdapter will
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will delegate class creation to the SecuritySupport class.
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<br>
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<h3>
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Context.exit()</h3>
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Context.exit() has been changed from an instance method to a static method.
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This makes it match the Context.enter() method, which is also static. See
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the <a href="http://www.mozilla.org/js/rhino/org/mozilla/javascript/Context.html#exit()">javadoc</a>
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for more information on its operation.
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<br>
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<h3>
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Context.enter(Context)</h3>
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A new overloaded form of Context.enter has been added. Without the addition
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of this method it was not possible to attach an existing context to a thread.
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See the <a href="http://www.mozilla.org/js/rhino/org/mozilla/javascript/Context.html#enter(org.mozilla.javascript.Context)">javadoc</a>
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for more information on its operation.
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<br>
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<h3>
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Listeners for Context</h3>
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Context now supports property change listeners for a couple of its properties.
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<h3>
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<hr WIDTH="100%"><br>
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<a href="index.html">back to top</a></h3>
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</body>
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</html>
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