147 lines
4.2 KiB
JavaScript
147 lines
4.2 KiB
JavaScript
/*
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* Copyright (C) 2016-2021 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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class TextSourceElement {
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constructor(element, fullContent=null, startOffset=0, endOffset=0) {
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this._element = element;
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this._fullContent = (typeof fullContent === 'string' ? fullContent : TextSourceElement.getElementContent(element));
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this._startOffset = startOffset;
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this._endOffset = endOffset;
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this._content = this._fullContent.substring(this._startOffset, this._endOffset);
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}
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get element() {
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return this._element;
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}
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get fullContent() {
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return this._fullContent;
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}
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get startOffset() {
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return this._startOffset;
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}
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get endOffset() {
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return this._endOffset;
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}
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get isConnected() {
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return this._element.isConnected;
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}
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clone() {
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return new TextSourceElement(this._element, this._fullContent, this._startOffset, this._endOffset);
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}
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cleanup() {
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// NOP
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}
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text() {
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return this._content;
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}
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setEndOffset(length, fromEnd=false) {
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if (fromEnd) {
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const delta = Math.min(this._fullContent.length - this._endOffset, length);
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this._endOffset += delta;
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this._content = this._fullContent.substring(this._startOffset, this._endOffset);
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return delta;
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} else {
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const delta = Math.min(this._fullContent.length - this._startOffset, length);
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this._endOffset = this._startOffset + delta;
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this._content = this._fullContent.substring(this._startOffset, this._endOffset);
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return delta;
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}
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}
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setStartOffset(length) {
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const delta = Math.min(this._startOffset, length);
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this._startOffset -= delta;
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this._content = this._fullContent.substring(this._startOffset, this._endOffset);
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return delta;
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}
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collapse(toStart) {
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if (toStart) {
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this._endOffset = this._startOffset;
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} else {
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this._startOffset = this._endOffset;
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}
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this._content = '';
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}
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getRect() {
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return this._element.getBoundingClientRect();
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}
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getWritingMode() {
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return 'horizontal-tb';
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}
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select() {
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// NOP
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}
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deselect() {
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// NOP
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}
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hasSameStart(other) {
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return (
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typeof other === 'object' &&
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other !== null &&
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other instanceof TextSourceElement &&
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this._element === other.element &&
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this._fullContent === other.fullContent &&
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this._startOffset === other.startOffset
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);
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}
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getNodesInRange() {
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return [this._element];
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}
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static getElementContent(element) {
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let content;
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switch (element.nodeName.toUpperCase()) {
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case 'BUTTON':
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content = element.textContent;
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break;
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case 'IMG':
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content = element.getAttribute('alt') || '';
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break;
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case 'SELECT':
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{
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const {selectedIndex, options} = element;
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const option = (selectedIndex >= 0 && selectedIndex < options.length ? options[selectedIndex] : null);
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content = (option !== null ? option.textContent : '');
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}
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break;
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default:
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content = `${element.value}`;
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break;
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}
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// Remove zero-width space and zero-width non-joiner
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content = content.replace(/[\u200b\u200c]/g, '');
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return content;
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}
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}
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