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/*
* Copyright (C) 2016-2022 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/>.
*/
/* global
* DocumentUtil
* StringUtil
*/
/**
* This class represents a text source that is attached to a HTML element, such as an <img>
* with alt text or a <button>.
*/
class TextSourceElement {
/**
* Creates a new instance of the class.
* @param {Element} element The source element.
* @param {string} fullContent The string representing the element's full text value.
* @param {number} startOffset The text start offset position within the full content.
* @param {number} endOffset The text end offset position within the full content.
*/
constructor(element, fullContent, startOffset, endOffset) {
this._element = element;
this._fullContent = fullContent;
this._startOffset = startOffset;
this._endOffset = endOffset;
this._content = this._fullContent.substring(this._startOffset, this._endOffset);
}
/**
* Gets the type name of this instance.
* @type {string}
*/
get type() {
return 'element';
}
/**
* The source element.
* @type {Element}
*/
get element() {
return this._element;
}
/**
* The string representing the element's full text value.
* @type {string}
*/
get fullContent() {
return this._fullContent;
}
/**
* The text start offset position within the full content.
* @type {number}
*/
get startOffset() {
return this._startOffset;
}
/**
* The text end offset position within the full content.
* @type {number}
*/
get endOffset() {
return this._endOffset;
}
/**
* Creates a clone of the instance.
* @returns {TextSourceElement} The new clone.
*/
clone() {
return new TextSourceElement(this._element, this._fullContent, this._startOffset, this._endOffset);
}
/**
* Performs any cleanup that is necessary after the element has been used.
*/
cleanup() {
// NOP
}
/**
* Gets the selected text of element, which is a substring of the full content
* starting at `startOffset` and ending at `endOffset`.
* @returns {string} The text content.
*/
text() {
return this._content;
}
/**
* Moves the end offset of the text by a set amount of unicode codepoints.
* @param {number} length The maximum number of codepoints to move by.
* @param {boolean} fromEnd Whether to move the offset from the current end position (if `true`) or the start position (if `false`).
* @returns {number} The actual number of characters (not codepoints) that were read.
*/
setEndOffset(length, fromEnd) {
const offset = fromEnd ? this._endOffset : this._startOffset;
length = Math.min(this._fullContent.length - offset, length);
if (length > 0) {
length = StringUtil.readCodePointsForward(this._fullContent, offset, length).length;
}
this._endOffset = offset + length;
this._content = this._fullContent.substring(this._startOffset, this._endOffset);
return length;
}
/**
* Moves the start offset of the text by a set amount of unicode codepoints.
* @param {number} length The maximum number of codepoints to move by.
* @returns {number} The actual number of characters (not codepoints) that were read.
*/
setStartOffset(length) {
length = Math.min(this._startOffset, length);
if (length > 0) {
length = StringUtil.readCodePointsBackward(this._fullContent, this._startOffset - 1, length).length;
}
this._startOffset -= length;
this._content = this._fullContent.substring(this._startOffset, this._endOffset);
return length;
}
/**
* Gets the rects that represent the position and bounds of the text source.
* @returns {DOMRect[]} The rects.
*/
getRects() {
return DocumentUtil.convertMultipleRectZoomCoordinates(this._element.getClientRects(), this._element);
}
/**
* Gets writing mode that is used for this element.
* See: https://developer.mozilla.org/en-US/docs/Web/CSS/writing-mode.
* @returns {string} The rects.
*/
getWritingMode() {
return 'horizontal-tb';
}
/**
* Selects the text source in the document.
*/
select() {
// NOP
}
/**
* Deselects the text source in the document.
*/
deselect() {
// NOP
}
/**
* Checks whether another text source has the same starting point.
* @param {TextSourceElement|TextSourceRange} other The other source to test.
* @returns {boolean} `true` if the starting points are equivalent, `false` otherwise.
*/
hasSameStart(other) {
return (
typeof other === 'object' &&
other !== null &&
other instanceof TextSourceElement &&
this._element === other.element &&
this._fullContent === other.fullContent &&
this._startOffset === other.startOffset
);
}
/**
* Gets a list of the nodes in this text source's range.
* @returns {Node[]} The nodes in the range.
*/
getNodesInRange() {
return [this._element];
}
/**
* Creates a new instance for a given element.
* @param {Element} element The source element.
* @returns {TextSourceElement} A new instance of the class corresponding to the element.
*/
static create(element) {
return new TextSourceElement(element, this._getElementContent(element), 0, 0);
}
/**
* Gets the full content string for a given element.
* @param {Element} element The element to get the full content of.
* @returns {string} The content string.
*/
static _getElementContent(element) {
let content;
switch (element.nodeName.toUpperCase()) {
case 'BUTTON':
content = element.textContent;
break;
case 'IMG':
content = element.getAttribute('alt') || '';
break;
case 'SELECT':
{
const {selectedIndex, options} = element;
const option = (selectedIndex >= 0 && selectedIndex < options.length ? options[selectedIndex] : null);
content = (option !== null ? option.textContent : '');
}
break;
default:
content = `${element.value}`;
break;
}
// Remove zero-width space and zero-width non-joiner
content = content.replace(/[\u200b\u200c]/g, '');
return content;
}
}
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