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annotate modules/opml.js @ 358:c00b3db58dcf

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add 'snowl' to all observer topics to avoid conflicts with other extensions/core code; use the Observers component everywhere
author Myk Melez <myk@mozilla.org>
date Tue, 04 Nov 2008 12:11:07 -0800
parents ae23e6f323db
children 57bbbcb76b0b
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1 /* ***** BEGIN LICENSE BLOCK *****
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2 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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3 *
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4 * The contents of this file are subject to the Mozilla Public License Version
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5 * 1.1 (the "License"); you may not use this file except in compliance with
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6 * the License. You may obtain a copy of the License at
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7 * http://www.mozilla.org/MPL/
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8 *
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9 * Software distributed under the License is distributed on an "AS IS" basis,
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10 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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11 * for the specific language governing rights and limitations under the
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12 * License.
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13 *
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14 * The Original Code is Snowl.
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15 *
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16 * The Initial Developer of the Original Code is Mozilla.
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17 * Portions created by the Initial Developer are Copyright (C) 2008
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18 * the Initial Developer. All Rights Reserved.
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19 *
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20 * Contributor(s):
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21 * Myk Melez <myk@mozilla.org>
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22 *
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23 * Alternatively, the contents of this file may be used under the terms of
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24 * either the GNU General Public License Version 2 or later (the "GPL"), or
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25 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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26 * in which case the provisions of the GPL or the LGPL are applicable instead
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27 * of those above. If you wish to allow use of your version of this file only
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28 * under the terms of either the GPL or the LGPL, and not to allow others to
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29 * use your version of this file under the terms of the MPL, indicate your
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30 * decision by deleting the provisions above and replace them with the notice
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31 * and other provisions required by the GPL or the LGPL. If you do not delete
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32 * the provisions above, a recipient may use your version of this file under
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33 * the terms of any one of the MPL, the GPL or the LGPL.
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34 *
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35 * ***** END LICENSE BLOCK ***** */
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36
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37 const Cc = Components.classes;
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38 const Ci = Components.interfaces;
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39 const Cr = Components.results;
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40 const Cu = Components.utils;
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41
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42 Cu.import("resource://snowl/modules/service.js");
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43
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44 let EXPORTED_SYMBOLS = ["SnowlOPML"];
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45
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46 let SnowlOPML = {
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47 //**************************************************************************//
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48 // OPML Export
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49 // Based on code in Thunderbird's feed-subscriptions.js.
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50
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51 export: function(window) {
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52 let fp = Cc["@mozilla.org/filepicker;1"].createInstance(Ci.nsIFilePicker);
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53 // FIXME: make this string localizable.
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54 fp.init(window, "Export sources as an OPML file", Ci.nsIFilePicker.modeSave);
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55 fp.appendFilter("OPML Files", "*.opml");
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56 fp.appendFilters(Ci.nsIFilePicker.filterXML | Ci.nsIFilePicker.filterAll);
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57 fp.defaultString = "sources.opml";
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58 fp.defaultExtension = "opml";
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59
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60 let rv = fp.show();
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61
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62 if (rv == Ci.nsIFilePicker.returnCancel)
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63 return;
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64
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65 let doc = this._createOPMLDocument(window.document);
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66
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67 // Format the document with newlines and indentation so it's easier
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68 // for humans to read.
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69 this._prettifyNode(doc.documentElement, 0);
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70
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71 let serializer = Cc["@mozilla.org/xmlextras/xmlserializer;1"].
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72 createInstance(Ci.nsIDOMSerializer);
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73 let foStream = Cc["@mozilla.org/network/file-output-stream;1"].
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74 createInstance(Ci.nsIFileOutputStream);
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75 // default mode: write | create | truncate
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76 let mode = 0x02 | 0x08 | 0x20;
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77 foStream.init(fp.file, mode, 0666, 0);
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78 serializer.serializeToStream(doc, foStream, "utf-8");
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79 },
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80
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81 _createOPMLDocument: function(document) {
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82 let doc = document.implementation.createDocument("", "opml", null);
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83 let root = doc.documentElement;
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84 root.setAttribute("version", "1.0");
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85
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86 // Create the <head> element.
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87 let head = doc.createElement("head");
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88 root.appendChild(head);
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89
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90 let title = doc.createElement("title");
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91 head.appendChild(title);
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92 title.appendChild(doc.createTextNode("Snowl OPML Export"));
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93
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94 let dt = doc.createElement("dateCreated");
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95 head.appendChild(dt);
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96 dt.appendChild(doc.createTextNode((new Date()).toGMTString()));
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97
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98 // Create the <body> element.
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99 let body = doc.createElement("body");
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100 root.appendChild(body);
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101
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102 // Populate the <body> element with <outline> elements.
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103 let sources = SnowlService.getSources();
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104 for each (let source in sources) {
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105 let outline = doc.createElement("outline");
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106 // XXX Should we specify the |type| attribute, and should we specify
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107 // type="atom" for Atom feeds or just type="rss" for all feeds?
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108 // This document says the latter but is three years old:
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109 // http://www.therssweblog.com/?guid=20051003145153
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110 //outline.setAttribute("type", "rss");
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111 outline.setAttribute("text", source.name);
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112 outline.setAttribute("url", source.humanURI.spec);
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113 outline.setAttribute("xmlUrl", source.machineURI.spec);
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114 body.appendChild(outline);
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115 }
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116
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117 return doc;
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118 },
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119
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120 _prettifyNode: function(node, level) {
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121 let doc = node.ownerDocument;
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122
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123 // Create a string containing two spaces for every level deep we are.
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124 let indentString = new Array(level + 1).join(" ");
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125
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126 // Indent the tag.
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127 if (level > 0)
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128 node.parentNode.insertBefore(doc.createTextNode(indentString), node);
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129
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130 // Grab the list of nodes to format. We can't just use node.childNodes
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131 // because it'd change under us as we insert formatting nodes.
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132 let childNodesToFormat = [];
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133 for (let i = 0; i < node.childNodes.length; i++)
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134 if (node.childNodes[i].nodeType == node.ELEMENT_NODE)
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135 childNodesToFormat.push(node.childNodes[i]);
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136
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137 if (childNodesToFormat.length > 0) {
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138 for each (let childNode in childNodesToFormat)
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139 this._prettifyNode(childNode, level + 1);
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140
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141 // Insert a newline after the opening tag.
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142 node.insertBefore(doc.createTextNode("\n"), node.firstChild);
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143
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144 // Indent the closing tag.
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145 node.appendChild(doc.createTextNode(indentString));
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146 }
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147
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148 // Insert a newline after the tag.
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149 if (level > 0) {
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150 if (node.nextSibling)
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151 node.parentNode.insertBefore(doc.createTextNode("\n"),
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152 node.nextSibling);
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153 else
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154 node.parentNode.appendChild(doc.createTextNode("\n"));
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155 }
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156 }
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157 };