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diff --git a/ext/fg/js/popup-nested.js b/ext/fg/js/popup-nested.js
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+/*
+ * Copyright (C) 2019 Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+
+let popupNestedInitialized = false;
+
+async function popupNestedInitialize(id, depth, parentFrameId) {
+ if (popupNestedInitialized) {
+ return;
+ }
+ popupNestedInitialized = true;
+
+ const options = await apiOptionsGet();
+ const popupNestingMaxDepth = options.scanning.popupNestingMaxDepth;
+
+ if (!(typeof popupNestingMaxDepth === 'number' && typeof depth === 'number' && depth < popupNestingMaxDepth)) {
+ return;
+ }
+
+ const ignoreNodes = options.scanning.enableOnPopupExpressions ? [] : [ '.expression', '.expression *' ];
+
+ window.frontendInitializationData = {id, depth, parentFrameId, ignoreNodes};
+
+ const scriptSrcs = [
+ '/fg/js/frontend-api-sender.js',
+ '/fg/js/popup.js',
+ '/fg/js/popup-proxy.js',
+ '/fg/js/frontend.js'
+ ];
+ for (const src of scriptSrcs) {
+ const script = document.createElement('script');
+ script.async = false;
+ script.src = src;
+ document.body.appendChild(script);
+ }
+}