Mercurial > addons > firefox-addons > feed-preview

annotate js/feed-preview.js @ 49:f4e8aa4d50da version-8

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Release version 8
author Guido Berhoerster <guido+feed-preview@berhoerster.name>
date Fri, 05 Jul 2019 13:42:36 +0200
parents 4492db3b277e
children
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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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11 function formatFileSize(size) {
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12 const LIMITS_UNITS = new Map([
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13 [1024 * 1024 * 1024, 'GiB'],
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14 [1024 * 1024, 'MiB'],
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15 [1024, 'KiB'],
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16 [0, 'B']
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17 ])
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18 for (let [limit, unit] of LIMITS_UNITS) {
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19 if (size >= limit) {
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20 return `${Number(size / limit).toFixed(1)} ${unit}`;
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21 }
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22 }
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23 return '? B';
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24 }
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26 export function renderFeedPreview(feedPreviewDocument, feed,
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27 expandEntriesByDefault) {
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28 // inject XSL stylesheet which transforms XHTML to HTML allowing the use of
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29 // the HTML DOM
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30 let xslFilename = browser.runtime.getURL('web_resources/xhtml-to-html.xsl');
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31 let xmlStylesheetNode =
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32 feedPreviewDocument.createProcessingInstruction('xml-stylesheet',
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33 `type="application/xslt+xml" href="${xslFilename}"`);
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34 feedPreviewDocument.firstChild.after(xmlStylesheetNode);
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36 feedPreviewDocument.querySelector('#default-stylesheet').href =
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37 browser.runtime.getURL('web_resources/style/feed-preview.css');
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39 // link to the currently viewed feed in order to allow feed reader addons
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40 // to subscribe to it
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41 let feedLinkElement = feedPreviewDocument.querySelector('#feed-link');
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42 feedLinkElement.href = feed.url;
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43 feedLinkElement.type = feed.type;
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44
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45 feedPreviewDocument.querySelector('title').textContent = feed.title;
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46
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47 feedPreviewDocument.querySelector('label[for="feed-reader-selection"]')
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48 .textContent = browser.i18n.getMessage('feedReaderSelectionLabel');
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49 feedPreviewDocument.querySelector('[name="subscribe"]').textContent =
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50 browser.i18n.getMessage('subscribeButtonLabel');
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51
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52 feedPreviewDocument.querySelector('#feed-title').textContent = feed.title;
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53 feedPreviewDocument.querySelector('#feed-subtitle').textContent =
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54 feed.subtitle;
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55
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56 if (typeof feed.logo !== 'undefined') {
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57 let feedLogoTemplate =
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58 feedPreviewDocument.querySelector('#feed-logo-template');
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59 let logoNode = feedPreviewDocument.importNode(feedLogoTemplate.content,
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60 true);
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61 let imgElement = logoNode.querySelector('#feed-logo');
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62 imgElement.setAttribute('src', feed.logo.url);
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63 imgElement.setAttribute('alt', feed.logo.title);
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64 feedPreviewDocument.querySelector('#feed-header').prepend(logoNode);
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65 }
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67 feedPreviewDocument.querySelector("#no-entries-hint").textContent =
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68 browser.i18n.getMessage('noEntriesHint');
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69
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70 let entryTemplateElement =
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71 feedPreviewDocument.querySelector('#entry-template');
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72 let entryTitleTemplateElement =
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73 feedPreviewDocument.querySelector('#entry-title-template');
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74 let entryTitleLinkedTemplateElement =
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75 feedPreviewDocument.querySelector('#entry-title-linked-template');
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76 let entryFileListTemplateElement =
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77 feedPreviewDocument.querySelector('#entry-files-list-template');
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78 let entryFileTemplateElement =
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79 feedPreviewDocument.querySelector('#entry-file-template');
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80 for (let entry of feed.entries) {
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81 let entryNode =
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82 feedPreviewDocument.importNode(entryTemplateElement.content,
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83 true);
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84 entryNode.querySelector('details.entry').open = expandEntriesByDefault;
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85
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86 let titleElement;
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87 let titleNode;
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88 if (typeof entry.link !== 'undefined') {
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89 titleNode = feedPreviewDocument
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90 .importNode(entryTitleLinkedTemplateElement.content, true);
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91 titleElement = titleNode.querySelector('.entry-link');
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92 titleElement.href = entry.link;
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93 titleElement.title = entry.title;
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94 } else {
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95 titleNode = feedPreviewDocument
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96 .importNode(entryTitleTemplateElement.content, true);
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97 titleElement = titleNode.querySelector('.entry-title');
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98 }
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99 titleElement.textContent = entry.title;
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100 entryNode.querySelector('.entry-header').prepend(titleNode);
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101
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102 let timeElement = entryNode.querySelector('.entry-date > time');
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103 timeElement.textContent = entry.date.toLocaleString();
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104
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105 let contentElement = entryNode.querySelector('.entry-content');
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106 let contentDocument = new DOMParser().parseFromString(entry.content,
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107 'text/html');
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108 let stylesheetElement = contentDocument.createElement('link');
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109 stylesheetElement.rel = 'stylesheet';
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110 stylesheetElement.href =
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111 browser.runtime.getURL('web_resources/style/entry-content.css');
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112 contentDocument.head.appendChild(stylesheetElement);
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113 // open links in a new tab rather than within the iframe
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114 for (let linkElement of contentDocument.links) {
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115 linkElement.target = '_blank';
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116 }
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117 contentElement.srcdoc = new XMLSerializer()
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118 .serializeToString(contentDocument);
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119 contentElement.title = entry.title;
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120
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121 if (entry.files.length > 0) {
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122 let fileListNode = feedPreviewDocument
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123 .importNode(entryFileListTemplateElement.content, true);
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124 fileListNode.querySelector('.entry-files-title').textContent =
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125 browser.i18n.getMessage('filesTitle');
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126 let fileListElement =
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127 fileListNode.querySelector('.entry-files-list');
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128
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129 for (let file of entry.files) {
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130 let fileNode = feedPreviewDocument
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131 .importNode(entryFileTemplateElement.content, true);
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132
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133 let fileLinkElement =
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134 fileNode.querySelector('.entry-file-link');
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135 fileLinkElement.href = file.url;
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136 fileLinkElement.title = file.filename;
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137 fileLinkElement.textContent = file.filename;
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138
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139 fileNode.querySelector('.entry-file-info').textContent =
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140 `(${file.type}, ${ formatFileSize(file.size)})`;
6
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141
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142 fileListElement.appendChild(fileNode);
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143 }
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144
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145 entryNode.querySelector('.entry').append(fileListNode);
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146 }
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147
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148 feedPreviewDocument.body.append(entryNode);
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149 }
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150 }