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-rw-r--r--ext/js/dom/text-source-element.js139
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diff --git a/ext/js/dom/text-source-element.js b/ext/js/dom/text-source-element.js
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+/*
+ * Copyright (C) 2016-2021 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 TextSourceElement {
+ constructor(element, fullContent=null, startOffset=0, endOffset=0) {
+ this._element = element;
+ this._fullContent = (typeof fullContent === 'string' ? fullContent : TextSourceElement.getElementContent(element));
+ this._startOffset = startOffset;
+ this._endOffset = endOffset;
+ this._content = this._fullContent.substring(this._startOffset, this._endOffset);
+ }
+
+ get element() {
+ return this._element;
+ }
+
+ get fullContent() {
+ return this._fullContent;
+ }
+
+ get startOffset() {
+ return this._startOffset;
+ }
+
+ get endOffset() {
+ return this._endOffset;
+ }
+
+ get isConnected() {
+ return this._element.isConnected;
+ }
+
+ clone() {
+ return new TextSourceElement(this._element, this._fullContent, this._startOffset, this._endOffset);
+ }
+
+ cleanup() {
+ // NOP
+ }
+
+ text() {
+ return this._content;
+ }
+
+ setEndOffset(length, fromEnd=false) {
+ if (fromEnd) {
+ const delta = Math.min(this._fullContent.length - this._endOffset, length);
+ this._endOffset += delta;
+ this._content = this._fullContent.substring(this._startOffset, this._endOffset);
+ return delta;
+ } else {
+ const delta = Math.min(this._fullContent.length - this._startOffset, length);
+ this._endOffset = this._startOffset + delta;
+ this._content = this._fullContent.substring(this._startOffset, this._endOffset);
+ return delta;
+ }
+ }
+
+ setStartOffset(length) {
+ const delta = Math.min(this._startOffset, length);
+ this._startOffset -= delta;
+ this._content = this._fullContent.substring(this._startOffset, this._endOffset);
+ return delta;
+ }
+
+ collapse(toStart) {
+ if (toStart) {
+ this._endOffset = this._startOffset;
+ } else {
+ this._startOffset = this._endOffset;
+ }
+ this._content = '';
+ }
+
+ getRect() {
+ return this._element.getBoundingClientRect();
+ }
+
+ getWritingMode() {
+ return 'horizontal-tb';
+ }
+
+ select() {
+ // NOP
+ }
+
+ deselect() {
+ // NOP
+ }
+
+ hasSameStart(other) {
+ return (
+ typeof other === 'object' &&
+ other !== null &&
+ other instanceof TextSourceElement &&
+ this._element === other.element &&
+ this._fullContent === other.fullContent &&
+ this._startOffset === other.startOffset
+ );
+ }
+
+ getNodesInRange() {
+ return [this._element];
+ }
+
+ static getElementContent(element) {
+ let content;
+ switch (element.nodeName.toUpperCase()) {
+ case 'BUTTON':
+ content = element.textContent;
+ break;
+ case 'IMG':
+ content = element.getAttribute('alt') || '';
+ break;
+ default:
+ content = `${element.value}`;
+ break;
+ }
+
+ // Remove zero-width non-joiner
+ content = content.replace(/\u200c/g, '');
+
+ return content;
+ }
+}