Mercurial > addons > firefox-addons > feed-preview

annotate js/feed-parser.js @ 6:5d7c13e998e9

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Create feed previews using a stream filter Instead of replacing the feed document with an XHTML preview from a content script after it has already been rendered, create an XHTML preview using a stream filter before it is passed into the rendering engine and use an XSL style sheet to convert it to HTML. This has two advantages, firstly it results in an HTMLDocument with the full HTML DOM available and secondly it avoids rendering the document twice. Refactor the feed preview creation and split parsing and rendering into seperate modules.
author Guido Berhoerster <guido+feed-preview@berhoerster.name>
date Thu, 08 Nov 2018 16:30:34 +0100
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children 2bbb7617dd13
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6
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1 /*
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2 * Copyright (C) 2018 Guido Berhoerster <guido+feed-preview@berhoerster.name>
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3 *
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4 * This Source Code Form is subject to the terms of the Mozilla Public
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5 * License, v. 2.0. If a copy of the MPL was not distributed with this
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6 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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7 */
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8
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9 'use strict';
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10
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11 export const XMLNS = {
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12 ATOM10: 'http://www.w3.org/2005/Atom',
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13 RSS09: 'http://my.netscape.com/rdf/simple/0.9/'
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14 }
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15 const ALLOWED_LINK_PROTOCOLS = new Set(['http:', 'https:', 'ftp:']);
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16
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17 function encodeXML(str) {
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18 return str.replace(/[<>&'"]/g, c => {
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19 switch (c) {
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20 case '<': return '&lt;';
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21 case '>': return '&gt;';
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22 case '&': return '&amp;';
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23 case '\'': return '&apos;';
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24 case '"': return '&quot;';
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25 }
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26 });
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27 }
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28
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29 function parseDate(s) {
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30 let date = new Date(s);
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31
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32 return isNaN(date) ? new Date(0) : date;
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33 }
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34
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35 function parseURL(text, baseURL = '') {
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36 let url;
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37
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38 try {
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39 url = new URL(text, baseURL);
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40 } catch (e) {
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41 return null;
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42 }
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43 if (!ALLOWED_LINK_PROTOCOLS.has(url.protocol)) {
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44 return null;
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45 }
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46
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47 return url;
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48 }
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49
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50 function feedNSResolver(prefix) {
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51 switch (prefix) {
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52 case 'atom':
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53 return XMLNS.ATOM10;
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54 case 'rss':
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55 return XMLNS.RSS09;
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56 }
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57 return null;
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58 }
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59
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60 function feedQueryXPath(feedDocument, scopeElement, xpathQuery) {
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61 return feedDocument.evaluate(xpathQuery, scopeElement, feedNSResolver,
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62 XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
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63 }
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64
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65 function feedQueryXPathAll(feedDocument, scopeElement, xpathQuery) {
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66 let result = feedDocument.evaluate(xpathQuery, scopeElement, feedNSResolver,
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67 XPathResult.ORDERED_NODE_ITERATOR_TYPE, null);
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68 let nodes = [];
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69 for (let node = result.iterateNext(); node !== null;
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70 node = result.iterateNext()) {
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71 nodes.push(node);
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72 }
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73
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74 return nodes;
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75 }
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76
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77 export class ParserError extends Error {
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78 constructor() {
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79 super(...arguments);
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80 this.name = this.constructor.name;
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81 }
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82 }
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83
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84 export class UnsupportedFeedTypeError extends Error {
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85 constructor(message = 'Document is not a supported feed', ...params) {
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86 super(message, ...params);
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87 this.name = this.constructor.name;
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88 }
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89 }
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90
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91 export class ProtocolError extends Error {
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92 constructor(url, status, statusText, ...params) {
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93 let message = `Protocol error: Transfer of ${url} failed with: ` +
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94 `${status} ${statusText}`
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95 super(message, ...params);
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96 this.name = this.constructor.name;
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97 this.url = url;
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98 this.status = status;
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99 this.statusText = statusText;
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100 }
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101 }
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102
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103 class FeedLogo {
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104 constructor(url, {title = ''} = {}) {
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105 this.url = url;
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106 this.title = title;
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107 }
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108 }
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109
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110 class FeedEntryFile {
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111 constructor(url, {type = browser.i18n.getMessage('defaultFileType'),
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112 size = 0} = {}) {
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113 this.filename = undefined;
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114 this._url = undefined;
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115 this.url = url;
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116 this.type = type;
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117 this.size = size;
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118 }
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119
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120 set url(url) {
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121 this._url = url;
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122 let filename = url.pathname.split('/').pop();
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123 this.filename = filename !== '' ? filename :
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124 browser.i18n.getMessage('defaultFileName');
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125 }
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126
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127 get url() {
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128 return this._url;
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129 }
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130 }
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131
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132 class FeedEntry {
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133 constructor({title = browser.i18n.getMessage('defaultFeedEntryTitle'),
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134 link = undefined, date = new Date(0), content = '',
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135 files = []} = {}) {
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136 this.title = title;
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137 this.link = link;
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138 this.date = date;
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139 this._content = undefined;
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140 this.content = content;
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141 this.files = files;
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142 }
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143
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144 normalizeContent(text) {
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145 if (typeof text === 'undefined') {
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146 return
5d7c13e998e9 Create feed previews using a stream filter
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147 }
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148
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149 let contentDocument = document.implementation.createHTMLDocument();
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150 let parsedDocument = new DOMParser().parseFromString(text, 'text/html');
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151 contentDocument.body = contentDocument.adoptNode(parsedDocument.body);
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152 return new XMLSerializer().serializeToString(contentDocument);
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153 }
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154
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155 set content(content) {
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156 this._content = this.normalizeContent(content);
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157 }
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158
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159 get content() {
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160 return this._content;
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161 }
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162 }
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163
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164 class Feed {
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165 constructor(url, {title = browser.i18n.getMessage('defaultFeedTitle'),
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166 subtitle = '', logo, entries = []} = {}) {
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167 this.url = url;
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168 this.title = title;
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169 this.subtitle = subtitle;
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170 this.logo = logo;
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171 this.entries = entries;
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172 }
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173 }
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174
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175 export class FeedParser {
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176 static probeFeed(feedDocument) {
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177 let documentElement = feedDocument.documentElement;
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178 if (documentElement.nodeName === 'feed' &&
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179 documentElement.namespaceURI === XMLNS.ATOM10) {
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180 let version = documentElement.getAttribute('version');
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181 if (version === null) {
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182 version = '1.0';
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183 }
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184 if (version === '1.0') {
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185 return ['atom', version];
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186 }
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187 } else if (documentElement.nodeName === 'rss') {
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188 let version = documentElement.getAttribute('version');
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189 switch (version) {
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190 case '0.90':
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191 case '0.91':
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192 case '0.92':
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193 case '0.93':
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194 case '0.94':
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195 case '2.0':
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196 return ['rss', version];
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197 }
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198 } else if (documentElement.localName.toLowerCase() === 'rdf' &&
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199 documentElement.getAttribute('xmlns') === XMLNS.RSS09) {
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200 return ['rss', '0.9'];
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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201 }
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202
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203 return [undefined, undefined];
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204 }
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205
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206 constructor() {
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207 this.url = undefined;
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208 this.document = undefined;
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209 }
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210
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211 parseAtomLogo(logoElement) {
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212 let url = parseURL(logoElement.textContent.trim(), this.url);
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213 if (url === null) {
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214 throw new TypeError('invalid URL in <logo> element');
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215 }
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216 return new FeedLogo(url);
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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217 }
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218
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219 parseAtomEntry(entryElement) {
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220 let title;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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221 let link;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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222 let date;
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223 let content;
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224 let titleElement = feedQueryXPath(this.document, entryElement,
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225 './atom:title');
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226 if (titleElement !== null) {
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227 title = titleElement.textContent.trim();
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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228 }
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229
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230 let linkElement = feedQueryXPath(this.document, entryElement,
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231 './atom:link[@href][@rel="alternate"]');
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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232 if (linkElement !== null) {
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233 link = parseURL(linkElement.getAttribute('href'), this.url);
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234 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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235
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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236 let updatedElement = feedQueryXPath(this.document, entryElement,
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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237 './atom:updated');
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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238 if (updatedElement !== null) {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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239 date = parseDate(updatedElement.textContent);
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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240 }
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241
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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242 let contentElement = feedQueryXPath(this.document, entryElement,
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243 './atom:content');
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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244 if (contentElement === null) {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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245 contentElement = feedQueryXPath(this.document, entryElement,
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246 './atom:summary');
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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247 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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248 if (contentElement !== null) {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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249 let contentType = contentElement.getAttribute('type');
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250 if (contentType === null) {
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251 contentType = 'text';
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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252 }
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253 contentType = contentType.toLowerCase();
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254 if (contentType === 'xhtml') {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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255 content = contentElement.innerHTML;
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256 } else if (contentType === 'html') {
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257 content = contentElement.textContent;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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258 } else {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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259 let encodedContent =
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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260 encodeXML(contentElement.textContent.trim());
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
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261 content = `<pre>${encodedContent}</pre>`;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
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262 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
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263 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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264
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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265 return new FeedEntry({title, link, date, content});
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
266 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
267
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
268 parseAtomFeed() {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
269 let title;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
270 let subtitle;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
271 let logo;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
272 let entries = [];
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
273 let documentElement = this.document.documentElement;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
274
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
275 let titleElement = feedQueryXPath(this.document, documentElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
276 './atom:title');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
277 if (titleElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
278 title = titleElement.textContent.trim();
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
279 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
280
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
281 let subtitleElement = feedQueryXPath(this.document, documentElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
282 './atom:subtitle');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
283 if (subtitleElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
284 subtitle = subtitleElement.textContent.trim();
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
285 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
286
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
287 let logoElement = feedQueryXPath(this.document, documentElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
288 './atom:logo');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
289 if (logoElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
290 try {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
291 logo = this.parseAtomLogo(logoElement);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
292 } catch (e) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
293 if (!(e instanceof TypeError)) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
294 throw e;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
295 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
296 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
297 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
298
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
299 let entryElements = feedQueryXPathAll(this.document, documentElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
300 './atom:entry');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
301 for (let entryElement of entryElements) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
302 entries.push(this.parseAtomEntry(entryElement));
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
303 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
304
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
305 return new Feed(this.url, {title, subtitle, logo, entries});
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
306 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
307
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
308 parseRSS1Logo(imageElement) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
309 let title;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
310 let urlElement = feedQueryXPath(this.document, imageElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
311 './rss:url');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
312 if (urlElement === null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
313 throw new TypeError('missing <url> element in <logo> element');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
314 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
315 let url = parseURL(urlElement.textContent.trim(), this.url);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
316 if (url === null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
317 throw new TypeError('invalid URL in <logo> element');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
318 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
319
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
320 let titleElement = feedQueryXPath(this.document, imageElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
321 './rss:title');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
322 if (titleElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
323 title = titleElement.textContent.trim();
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
324 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
325
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
326 return new FeedLogo(url, {title});
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
327 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
328
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
329 parseRSS1Entry(itemElement) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
330 let title;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
331 let link;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
332 let titleElement = feedQueryXPath(this.document, itemElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
333 './rss:title');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
334 if (titleElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
335 title = titleElement.textContent;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
336 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
337
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
338 let linkElement = feedQueryXPath(this.document, itemElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
339 './rss:link');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
340 if (linkElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
341 link = parseURL(linkElement.textContent, this.url);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
342 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
343
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
344 return new FeedEntry({title, link});
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
345 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
346
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
347 parseRSS1Feed() {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
348 let title;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
349 let subtitle;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
350 let logo;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
351 let entries = [];
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
352 let documentElement = this.document.documentElement;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
353 let titleElement = feedQueryXPath(this.document, documentElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
354 './rss:channel/rss:title');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
355 if (titleElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
356 title = titleElement.textContent;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
357 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
358
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
359 let descriptionElement = feedQueryXPath(this.document, documentElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
360 './channel/description');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
361 if (descriptionElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
362 subtitle = descriptionElement.textContent;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
363 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
364
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
365 let imageElement = feedQueryXPath(this.document, documentElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
366 './rss:image');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
367 if (imageElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
368 try {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
369 logo = this.parseRSS1Logo(imageElement);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
370 } catch (e) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
371 if (!(e instanceof TypeError)) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
372 throw e;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
373 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
374 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
375 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
376
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
377 let itemElements = feedQueryXPathAll(this.document, documentElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
378 './rss:item');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
379 for (let itemElement of itemElements) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
380 let entry = this.parseRSS1Entry(itemElement);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
381 if (typeof entry !== 'undefined') {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
382 entries.push(entry);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
383 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
384 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
385
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
386 return new Feed(this.url, {title, subtitle, logo, entries});
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
387 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
388
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
389 parseRSS2Logo(imageElement) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
390 let title;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
391 let urlElement = feedQueryXPath(this.document, imageElement, './url');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
392 if (urlElement === null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
393 throw new TypeError('missing <url> element in <logo> element');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
394 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
395 let url = parseURL(urlElement.textContent.trim(), this.url);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
396 if (url === null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
397 throw new TypeError('invalid URL in <logo> element');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
398 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
399
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
400 let titleElement = feedQueryXPath(this.document, imageElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
401 './title');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
402 if (titleElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
403 title = titleElement.textContent.trim();
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
404 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
405
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
406 return new FeedLogo(url, {title});
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
407 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
408
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
409 parseRSS2EntryFile(enclosureElement) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
410 let type;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
411 let size;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
412 let url = parseURL(enclosureElement.getAttribute('url'), this.url);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
413 if (url === null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
414 throw new TypeError('invalid URL in <enclosure> element');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
415 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
416
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
417 let typeAttribute = enclosureElement.getAttribute('type');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
418 if (typeAttribute !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
419 type = typeAttribute;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
420 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
421
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
422 let length = parseInt(enclosureElement.getAttribute('length'),
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
423 10);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
424 if (!isNaN(length)) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
425 size = length;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
426 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
427
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
428 return new FeedEntryFile(url, {type, size});
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
429 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
430
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
431 parseRSS2Entry(itemElement) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
432 let title;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
433 let link;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
434 let date;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
435 let content;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
436 let files = [];
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
437 let titleElement = feedQueryXPath(this.document, itemElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
438 './title');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
439 if (titleElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
440 title = titleElement.textContent;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
441 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
442
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
443 let linkElement = feedQueryXPath(this.document, itemElement, './link');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
444 if (linkElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
445 link = parseURL(linkElement.textContent, this.url);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
446 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
447
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
448 let pubDateElement = feedQueryXPath(this.document, itemElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
449 './pubDate');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
450 if (pubDateElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
451 date = parseDate(pubDateElement.textContent);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
452 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
453
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
454 let descriptionElement = feedQueryXPath(this.document, itemElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
455 './description');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
456 if (descriptionElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
457 content = descriptionElement.textContent.trim();
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
458 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
459
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
460 for (let enclosureElement of
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
461 feedQueryXPathAll(this.document, itemElement, './enclosure')) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
462 try {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
463 let entryFile = this.parseRSS2EntryFile(enclosureElement);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
464 files.push(entryFile);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
465 } catch (e) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
466 if (!(e instanceof TypeError)) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
467 throw e;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
468 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
469 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
470 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
471
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
472 return new FeedEntry({title, link, date, content, files});
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
473 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
474
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
475 parseRSS2Feed() {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
476 let title;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
477 let subtitle;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
478 let logo;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
479 let entries = [];
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
480 let documentElement = this.document.documentElement;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
481 let titleElement = feedQueryXPath(this.document, documentElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
482 './channel/title');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
483 if (titleElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
484 title = titleElement.textContent;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
485 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
486
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
487 let descriptionElement = feedQueryXPath(this.document, documentElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
488 './channel/description');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
489 if (descriptionElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
490 subtitle = descriptionElement.textContent;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
491 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
492
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
493 let imageElement = feedQueryXPath(this.document, documentElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
494 './channel/image');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
495 if (imageElement !== null) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
496 try {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
497 logo = this.parseRSS2Logo(imageElement);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
498 } catch (e) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
499 if (!(e instanceof TypeError)) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
500 throw e;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
501 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
502 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
503 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
504
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
505 let itemElements = feedQueryXPathAll(this.document, documentElement,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
506 './channel/item');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
507 for (let itemElement of itemElements) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
508 let entry = this.parseRSS2Entry(itemElement);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
509 if (typeof entry !== 'undefined') {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
510 entries.push(entry);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
511 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
512 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
513
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
514 return new Feed(this.url, {title, subtitle, logo, entries});
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
515 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
516
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
517 parseFromString(xmlString, url) {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
518 this.url = url;
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
519 this.document = new DOMParser().parseFromString(xmlString,
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
520 'application/xml');
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
521 if (this.document.documentElement.nodeName.toLowerCase() ===
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
522 'parsererror') {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
523 throw new ParserError(this.document.documentElement.textContent);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
524 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
525
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
526 let [type, version] = this.constructor.probeFeed(this.document);
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
527 if (type === 'atom') {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
528 return this.parseAtomFeed();
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
529 } else if (type === 'rss') {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
530 if (version === '0.9') {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
531 return this.parseRSS1Feed();
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
532 } else {
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
533 return this.parseRSS2Feed();
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
534 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
535 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
536 throw new UnsupportedFeedTypeError();
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
537 }
5d7c13e998e9 Create feed previews using a stream filter
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
538 }