jdk8-mips64-public/nashorn: samples/gutenberg.js@b1a7da25b547 (annotated)

samples/gutenberg.js@b1a7da25b547 (annotated)

samples/gutenberg.js

Wed, 27 Apr 2016 01:36:41 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:36:41 +0800
changeset 0: b1a7da25b547
child 962: ac62e33a99b0
permissions: -rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/nashorn/
changeset: 1034:4b9cc65dd24d
tag: jdk8u25-b17

 #// Usage: jjs -scripting gutenberg.js
 /*
  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *   - Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  *
  *   - Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  *
  *   - Neither the name of Oracle nor the names of its
  *     contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 // Simple example that demonstrates reading XML Rss feed
 // to generate a HTML file from script and show it by browser
 // Java classes used
 var Characters = Java.type("javax.xml.stream.events.Characters");
 var Factory = Java.type("javax.xml.stream.XMLInputFactory");
 var File = Java.type("java.io.File");
 var FileWriter = Java.type("java.io.FileWriter");
 var PrintWriter = Java.type("java.io.PrintWriter");
 var URL = Java.type("java.net.URL");
 // read Rss feed from a URL. Returns an array
 // of objects having only title and link properties
 function readRssFeed(url) {
     var fac = Factory.newInstance();
     var reader = fac.createXMLEventReader(url.openStream());
     // get text content from next event
     function getChars() {
         var result = "";
         var e = reader.nextEvent();
         if (e instanceof Characters) {
             result = e.getData();
         }
         return result;
     }
     var items = [];
     var title, link;
     var inItem = false;
     while (reader.hasNext()) {
         var evt = reader.nextEvent();
         if (evt.isStartElement()) {
             var local = evt.name.localPart;
             if (local == "item") {
                // capture title, description now
                inItem = true;
             }
             if (inItem) {
                 switch (local) {
                     case 'title':
                         title = getChars();
                         break;
                     case 'link':
                         link = getChars();
                         break;
                 }
             }
         } else if (evt.isEndElement()) {
             var local = evt.name.localPart;
             if (local == "item") {
                 // one item done, save it in result array
                 items.push({ title: title, link: link });
                 inItem = false;
             }
         }
     }
     return items;
 }
 // generate simple HTML for an RSS feed
 function getBooksHtml() {
     var url = new URL("http://www.gutenberg.org/cache/epub/feeds/today.rss");
     var items = readRssFeed(url);
     var str = "<ul>";
     // Nashorn's string interpolation and heredoc
     // support is very handy in generating text content
     // that is filled with elements from runtime objects.
     // We insert title and link in <li> elements here.
     for each (i in items) {
         str += <<EOF
 <li>
     <a href="${i.link}">${i.title}</a>
 </li>
 EOF
     }
     str += "</ul>";
     return str;
 }
 // write the string to the given file
 function writeTo(file, str) {
     var w = new PrintWriter(new FileWriter(file));
     try {
         w.print(str);
     } finally {
         w.close();
     }
 }
 // generate books HTML
 var str = getBooksHtml();
 // write to file. __DIR__ is directory where
 // this script is stored.
 var file = new File(__DIR__ + "books.html");
 writeTo(file, str);
 // show it by desktop browser
 try {
     var Desktop = Java.type("java.awt.Desktop");
     Desktop.desktop.browse(file.toURI());
 } catch (e) {
     print(e);
 }