Move bg/js (#1387)

* Move bg/js/anki.js to js/comm/anki.js

* Move bg/js/mecab.js to js/comm/mecab.js

* Move bg/js/search-main.js to js/display/search-main.js

* Move bg/js/template-patcher.js to js/templates/template-patcher.js

* Move bg/js/template-renderer-frame-api.js to js/templates/template-renderer-frame-api.js

* Move bg/js/template-renderer-frame-main.js to js/templates/template-renderer-frame-main.js

* Move bg/js/template-renderer-proxy.js to js/templates/template-renderer-proxy.js

* Move bg/js/template-renderer.js to js/templates/template-renderer.js

* Move bg/js/media-utility.js to js/media/media-utility.js

* Move bg/js/native-simple-dom-parser.js to js/dom/native-simple-dom-parser.js

* Move bg/js/simple-dom-parser.js to js/dom/simple-dom-parser.js

* Move bg/js/audio-downloader.js to js/media/audio-downloader.js

* Move bg/js/deinflector.js to js/language/deinflector.js

* Move bg/js/backend.js to js/background/backend.js

* Move bg/js/translator.js to js/language/translator.js

* Move bg/js/search-display-controller.js to js/display/search-display-controller.js

* Move bg/js/request-builder.js to js/background/request-builder.js

* Move bg/js/text-source-map.js to js/general/text-source-map.js

* Move bg/js/clipboard-reader.js to js/comm/clipboard-reader.js

* Move bg/js/clipboard-monitor.js to js/comm/clipboard-monitor.js

* Move bg/js/query-parser.js to js/display/query-parser.js

* Move bg/js/profile-conditions.js to js/background/profile-conditions.js

* Move bg/js/dictionary-database.js to js/language/dictionary-database.js

* Move bg/js/dictionary-importer.js to js/language/dictionary-importer.js

* Move bg/js/anki-note-builder.js to js/data/anki-note-builder.js

* Move bg/js/anki-note-data.js to js/data/anki-note-data.js

* Move bg/js/database.js to js/data/database.js

* Move bg/js/json-schema.js to js/data/json-schema.js

* Move bg/js/options.js to js/data/options-util.js

* Move bg/js/background-main.js to js/background/background-main.js

* Move bg/js/permissions-util.js to js/data/permissions-util.js

* Move bg/js/context-main.js to js/pages/action-popup-main.js

* Move bg/js/generic-page-main.js to js/pages/generic-page-main.js

* Move bg/js/info-main.js to js/pages/info-main.js

* Move bg/js/permissions-main.js to js/pages/permissions-main.js

* Move bg/js/welcome-main.js to js/pages/welcome-main.js

1 files changed, 117 insertions, 0 deletions

diff --git a/ext/js/dom/simple-dom-parser.js b/ext/js/dom/simple-dom-parser.js
new file mode 100644
index 00000000..7c57ca98
--- /dev/null
+++ b/ext/js/dom/simple-dom-parser.js
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2020-2021  Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/* globals
+ * parse5
+ */
+
+class SimpleDOMParser {
+    constructor(content) {
+        this._document = parse5.parse(content);
+    }
+
+    getElementById(id, root=null) {
+        for (const node of this._allNodes(root)) {
+            if (typeof node.tagName === 'string' && this.getAttribute(node, 'id') === id) {
+                return node;
+            }
+        }
+        return null;
+    }
+
+    getElementByTagName(tagName, root=null) {
+        for (const node of this._allNodes(root)) {
+            if (node.tagName === tagName) {
+                return node;
+            }
+        }
+        return null;
+    }
+
+    getElementsByTagName(tagName, root=null) {
+        const results = [];
+        for (const node of this._allNodes(root)) {
+            if (node.tagName === tagName) {
+                results.push(node);
+            }
+        }
+        return results;
+    }
+
+    getElementsByClassName(className, root=null) {
+        const results = [];
+        const classNamePattern = new RegExp(`(^|\\s)${escapeRegExp(className)}(\\s|$)`);
+        for (const node of this._allNodes(root)) {
+            if (typeof node.tagName === 'string') {
+                const nodeClassName = this.getAttribute(node, 'class');
+                if (nodeClassName !== null && classNamePattern.test(nodeClassName)) {
+                    results.push(node);
+                }
+            }
+        }
+        return results;
+    }
+
+    getAttribute(element, attribute) {
+        for (const attr of element.attrs) {
+            if (
+                attr.name === attribute &&
+                typeof attr.namespace === 'undefined'
+            ) {
+                return attr.value;
+            }
+        }
+        return null;
+    }
+
+    getTextContent(element) {
+        let source = '';
+        for (const node of this._allNodes(element)) {
+            if (node.nodeName === '#text') {
+                source += node.value;
+            }
+        }
+        return source;
+    }
+
+    static isSupported() {
+        return typeof parse5 !== 'undefined';
+    }
+
+    // Private
+
+    *_allNodes(root) {
+        if (root === null) {
+            root = this._document;
+        }
+
+        // Depth-first pre-order traversal
+        const nodeQueue = [root];
+        while (nodeQueue.length > 0) {
+            const node = nodeQueue.pop();
+
+            yield node;
+
+            const childNodes = node.childNodes;
+            if (typeof childNodes !== 'undefined') {
+                for (let i = childNodes.length - 1; i >= 0; --i) {
+                    nodeQueue.push(childNodes[i]);
+                }
+            }
+        }
+    }
+}