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authortoasted-nutbread <toasted-nutbread@users.noreply.github.com>2020-04-23 18:26:48 -0400
committerGitHub <noreply@github.com>2020-04-23 18:26:48 -0400
commit6b0f1f268b869eed40aa6be9aa43fcfebb9169ed (patch)
treee1f77a1e46815857cc90aaef683c3ea5a0385078 /ext/mixed/js/dynamic-loader.js
parent9216d1862fa8d0f51fe1dba603c2643aa8ef4215 (diff)
parent749b747728175d8a7d5638af2c6ec01102a282c1 (diff)
Merge pull request #467 from toasted-nutbread/dynamic-loader
Create dynamic script/CSS loader utility
Diffstat (limited to 'ext/mixed/js/dynamic-loader.js')
-rw-r--r--ext/mixed/js/dynamic-loader.js82
1 files changed, 82 insertions, 0 deletions
diff --git a/ext/mixed/js/dynamic-loader.js b/ext/mixed/js/dynamic-loader.js
new file mode 100644
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+++ b/ext/mixed/js/dynamic-loader.js
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+/*
+ * Copyright (C) 2020 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/>.
+ */
+
+const dynamicLoader = (() => {
+ function loadStyles(urls) {
+ const parent = document.head;
+ for (const url of urls) {
+ const node = parent.querySelector(`link[href='${escapeCSSAttribute(url)}']`);
+ if (node !== null) { continue; }
+
+ const style = document.createElement('link');
+ style.rel = 'stylesheet';
+ style.type = 'text/css';
+ style.href = url;
+ parent.appendChild(style);
+ }
+ }
+
+ function loadScripts(urls) {
+ return new Promise((resolve) => {
+ const parent = document.body;
+ for (const url of urls) {
+ const node = parent.querySelector(`script[src='${escapeCSSAttribute(url)}']`);
+ if (node !== null) { continue; }
+
+ const script = document.createElement('script');
+ script.async = false;
+ script.src = url;
+ parent.appendChild(script);
+ }
+
+ loadScriptSentinel(resolve);
+ });
+ }
+
+ function loadScriptSentinel(resolve, reject) {
+ const parent = document.body;
+ const script = document.createElement('script');
+
+ const sentinelEventName = 'dynamicLoaderSentinel';
+ const sentinelEventCallback = (e) => {
+ if (e.script !== script) { return; }
+ yomichan.off(sentinelEventName, sentinelEventCallback);
+ parent.removeChild(script);
+ resolve();
+ };
+ yomichan.on(sentinelEventName, sentinelEventCallback);
+
+ try {
+ script.async = false;
+ script.src = '/mixed/js/dynamic-loader-sentinel.js';
+ parent.appendChild(script);
+ } catch (e) {
+ yomichan.off(sentinelEventName, sentinelEventCallback);
+ reject(e);
+ }
+ }
+
+ function escapeCSSAttribute(value) {
+ return value.replace(/['\\]/g, (character) => `\\${character}`);
+ }
+
+
+ return {
+ loadStyles,
+ loadScripts
+ };
+})();