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, 80 insertions, 0 deletions

diff --git a/ext/js/comm/clipboard-monitor.js b/ext/js/comm/clipboard-monitor.js
new file mode 100644
index 00000000..7379d7ad
--- /dev/null
+++ b/ext/js/comm/clipboard-monitor.js
@@ -0,0 +1,80 @@
+/*
+ * 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/>.
+ */
+
+class ClipboardMonitor extends EventDispatcher {
+    constructor({japaneseUtil, clipboardReader}) {
+        super();
+        this._japaneseUtil = japaneseUtil;
+        this._clipboardReader = clipboardReader;
+        this._timerId = null;
+        this._timerToken = null;
+        this._interval = 250;
+        this._previousText = null;
+    }
+
+    start() {
+        this.stop();
+
+        // The token below is used as a unique identifier to ensure that a new clipboard monitor
+        // hasn't been started during the await call. The check below the await call
+        // will exit early if the reference has changed.
+        let canChange = false;
+        const token = {};
+        const intervalCallback = async () => {
+            this._timerId = null;
+
+            let text = null;
+            try {
+                text = await this._clipboardReader.getText();
+            } catch (e) {
+                // NOP
+            }
+            if (this._timerToken !== token) { return; }
+
+            if (
+                typeof text === 'string' &&
+                (text = text.trim()).length > 0 &&
+                text !== this._previousText
+            ) {
+                this._previousText = text;
+                if (canChange && this._japaneseUtil.isStringPartiallyJapanese(text)) {
+                    this.trigger('change', {text});
+                }
+            }
+
+            canChange = true;
+            this._timerId = setTimeout(intervalCallback, this._interval);
+        };
+
+        this._timerToken = token;
+
+        intervalCallback();
+    }
+
+    stop() {
+        this._timerToken = null;
+        this._previousText = null;
+        if (this._timerId !== null) {
+            clearTimeout(this._timerId);
+            this._timerId = null;
+        }
+    }
+
+    setPreviousText(text) {
+        this._previousText = text;
+    }
+}