Document util + google docs util state refactor (#590)

* Remove static from GoogleDocsUtil since it has state

* Create TextSourceGenerator

* Remove DocumentUtil custom registrations

* Use TextSourceGenerator

1 files changed, 47 insertions, 0 deletions

diff --git a/ext/js/dom/text-source-generator.js b/ext/js/dom/text-source-generator.js
new file mode 100644
index 00000000..0435e69b
--- /dev/null
+++ b/ext/js/dom/text-source-generator.js
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2024  Yomitan 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/>.
+ */
+
+import {DocumentUtil} from './document-util.js';
+
+export class TextSourceGenerator {
+    constructor() {
+        /** @type {import('text-source-generator').GetRangeFromPointHandler[]} @readonly */
+        this._getRangeFromPointHandlers = [];
+    }
+
+    /**
+     * @param {number} x
+     * @param {number} y
+     * @param {import('document-util').GetRangeFromPointOptions} options
+     * @returns {?import('text-source').TextSource}
+     */
+    getRangeFromPoint(x, y, options) {
+        for (const handler of this._getRangeFromPointHandlers) {
+            const result = handler(x, y, options);
+            if (result !== null) { return result; }
+        }
+        return DocumentUtil.getRangeFromPoint(x, y, options);
+    }
+
+    /**
+     * Registers a custom handler for scanning for text or elements at the input position.
+     * @param {import('text-source-generator').GetRangeFromPointHandler} handler The handler callback which will be invoked when calling `getRangeFromPoint`.
+     */
+    registerGetRangeFromPointHandler(handler) {
+        this._getRangeFromPointHandlers.push(handler);
+    }
+}