mirror of
https://github.com/ksyasuda/SubMiner.git
synced 2026-02-28 06:22:45 -08:00
691 lines
27 KiB
JavaScript
691 lines
27 KiB
JavaScript
/*
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* Copyright (C) 2024-2025 Yomitan 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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import {computeZoomScale, isPointInAnyRect} from './document-util.js';
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import {DOMTextScanner} from './dom-text-scanner.js';
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import {TextSourceElement} from './text-source-element.js';
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import {TextSourceRange} from './text-source-range.js';
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export class TextSourceGenerator {
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constructor() {
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/** @type {RegExp} @readonly */
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this._transparentColorPattern = /rgba\s*\([^)]*,\s*0(?:\.0+)?\s*\)/;
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/** @type {import('text-source-generator').GetRangeFromPointHandler[]} @readonly */
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this._getRangeFromPointHandlers = [];
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}
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/**
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* @param {number} x
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* @param {number} y
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* @param {import('document-util').GetRangeFromPointOptions} options
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* @returns {?import('text-source').TextSource}
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*/
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getRangeFromPoint(x, y, options) {
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for (const handler of this._getRangeFromPointHandlers) {
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const result = handler(x, y, options);
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if (result !== null) { return result; }
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}
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return this._getRangeFromPointInternal(x, y, options);
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}
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/**
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* Registers a custom handler for scanning for text or elements at the input position.
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* @param {import('text-source-generator').GetRangeFromPointHandler} handler The handler callback which will be invoked when calling `getRangeFromPoint`.
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*/
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registerGetRangeFromPointHandler(handler) {
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this._getRangeFromPointHandlers.push(handler);
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}
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/**
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* Extract a sentence from a document.
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* @param {import('text-source').TextSource} source The text source object, either `TextSourceRange` or `TextSourceElement`.
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* @param {boolean} layoutAwareScan Whether or not layout-aware scan mode should be used.
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* @param {number} extent The length of the sentence to extract.
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* @param {boolean} terminateAtNewlines Whether or not a sentence should be terminated at newline characters.
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* @param {import('text-scanner').SentenceTerminatorMap} terminatorMap A mapping of characters that terminate a sentence.
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* @param {import('text-scanner').SentenceForwardQuoteMap} forwardQuoteMap A mapping of quote characters that delimit a sentence.
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* @param {import('text-scanner').SentenceBackwardQuoteMap} backwardQuoteMap A mapping of quote characters that delimit a sentence, which is the inverse of forwardQuoteMap.
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* @returns {{text: string, offset: number}} The sentence and the offset to the original source.
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*/
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extractSentence(source, layoutAwareScan, extent, terminateAtNewlines, terminatorMap, forwardQuoteMap, backwardQuoteMap) {
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// Scan text
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source = source.clone();
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const startLength = source.setStartOffset(extent, layoutAwareScan);
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const endLength = source.setEndOffset(extent * 2 - startLength, true, layoutAwareScan);
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const text = [...source.text()];
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const textLength = text.length;
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const textEndAnchor = textLength - endLength;
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/** Relative start position of the sentence (inclusive). */
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let cursorStart = startLength;
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/** Relative end position of the sentence (exclusive). */
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let cursorEnd = textEndAnchor;
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// Move backward
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let quoteStack = [];
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for (; cursorStart > 0; --cursorStart) {
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// Check if the previous character should be included.
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let c = text[cursorStart - 1];
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if (c === '\n' && terminateAtNewlines) { break; }
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if (quoteStack.length === 0) {
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let terminatorInfo = terminatorMap.get(c);
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if (typeof terminatorInfo !== 'undefined') {
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// Include the previous character while it is a terminator character and is included at start.
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while (terminatorInfo[0] && cursorStart > 0) {
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--cursorStart;
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if (cursorStart === 0) { break; }
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c = text[cursorStart - 1];
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terminatorInfo = terminatorMap.get(c);
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if (typeof terminatorInfo === 'undefined') { break; }
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}
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break;
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}
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}
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let quoteInfo = forwardQuoteMap.get(c);
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if (typeof quoteInfo !== 'undefined') {
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if (quoteStack.length === 0) {
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// Include the previous character while it is a quote character and is included at start.
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while (quoteInfo[1] && cursorStart > 0) {
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--cursorStart;
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if (cursorStart === 0) { break; }
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c = text[cursorStart - 1];
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quoteInfo = forwardQuoteMap.get(c);
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if (typeof quoteInfo === 'undefined') { break; }
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}
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break;
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} else if (quoteStack[0] === c) {
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quoteStack.pop();
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continue;
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}
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}
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quoteInfo = backwardQuoteMap.get(c);
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if (typeof quoteInfo !== 'undefined') {
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quoteStack.unshift(quoteInfo[0]);
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}
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}
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// Move forward
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quoteStack = [];
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for (; cursorEnd < textLength; ++cursorEnd) {
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// Check if the following character should be included.
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let c = text[cursorEnd];
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if (c === '\n' && terminateAtNewlines) { break; }
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if (quoteStack.length === 0) {
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let terminatorInfo = terminatorMap.get(c);
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if (typeof terminatorInfo !== 'undefined') {
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// Include the following character while it is a terminator character and is included at end.
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while (terminatorInfo[1] && cursorEnd < textLength) {
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++cursorEnd;
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if (cursorEnd === textLength) { break; }
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c = text[cursorEnd];
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terminatorInfo = terminatorMap.get(c);
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if (typeof terminatorInfo === 'undefined') { break; }
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}
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break;
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}
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}
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let quoteInfo = backwardQuoteMap.get(c);
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if (typeof quoteInfo !== 'undefined') {
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if (quoteStack.length === 0) {
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// Include the following character while it is a quote character and is included at end.
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while (quoteInfo[1] && cursorEnd < textLength) {
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++cursorEnd;
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if (cursorEnd === textLength) { break; }
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c = text[cursorEnd];
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quoteInfo = forwardQuoteMap.get(c);
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if (typeof quoteInfo === 'undefined') { break; }
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}
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break;
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} else if (quoteStack[0] === c) {
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quoteStack.pop();
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continue;
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}
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}
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quoteInfo = forwardQuoteMap.get(c);
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if (typeof quoteInfo !== 'undefined') {
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quoteStack.unshift(quoteInfo[0]);
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}
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}
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// Trim whitespace
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for (; cursorStart < startLength && this._isWhitespace(text[cursorStart]); ++cursorStart) { /* NOP */ }
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for (; cursorEnd > textEndAnchor && this._isWhitespace(text[cursorEnd - 1]); --cursorEnd) { /* NOP */ }
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// Result
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return {
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text: text.slice(cursorStart, cursorEnd).join(''),
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offset: startLength - cursorStart,
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};
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}
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/**
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* Scans the document for text or elements with text information at the given coordinate.
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* Coordinates are provided in [client space](https://developer.mozilla.org/en-US/docs/Web/CSS/CSSOM_View/Coordinate_systems).
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* @param {number} x The x coordinate to search at.
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* @param {number} y The y coordinate to search at.
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* @param {import('document-util').GetRangeFromPointOptions} options Options to configure how element detection is performed.
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* @returns {?import('text-source').TextSource} A range for the hovered text or element, or `null` if no applicable content was found.
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*/
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_getRangeFromPointInternal(x, y, options) {
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const {deepContentScan, normalizeCssZoom, language} = options;
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const elements = this._getElementsFromPoint(x, y, deepContentScan);
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/** @type {?HTMLDivElement} */
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let imposter = null;
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/** @type {?HTMLDivElement} */
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let imposterContainer = null;
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/** @type {?Element} */
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let imposterSourceElement = null;
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if (elements.length > 0) {
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const element = elements[0];
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switch (element.nodeName.toUpperCase()) {
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case 'IMG':
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case 'BUTTON':
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case 'SELECT':
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return TextSourceElement.create(element);
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case 'INPUT':
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if (
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/** @type {HTMLInputElement} */ (element).type === 'text' ||
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/** @type {HTMLInputElement} */ (element).type === 'search'
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) {
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imposterSourceElement = element;
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[imposter, imposterContainer] = this._createImposter(/** @type {HTMLInputElement} */ (element), false);
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}
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break;
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case 'TEXTAREA':
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imposterSourceElement = element;
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[imposter, imposterContainer] = this._createImposter(/** @type {HTMLTextAreaElement} */ (element), true);
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break;
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}
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}
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const range = this._caretRangeFromPointExt(x, y, deepContentScan ? elements : [], normalizeCssZoom, language);
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if (range !== null) {
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if (imposter !== null) {
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this._setImposterStyle(/** @type {HTMLDivElement} */ (imposterContainer).style, 'z-index', '-2147483646');
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this._setImposterStyle(imposter.style, 'pointer-events', 'none');
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return TextSourceRange.createFromImposter(range, /** @type {HTMLDivElement} */ (imposterContainer), /** @type {HTMLElement} */ (imposterSourceElement));
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}
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return TextSourceRange.create(range);
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} else {
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if (imposterContainer !== null) {
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const {parentNode} = imposterContainer;
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if (parentNode !== null) {
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parentNode.removeChild(imposterContainer);
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}
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}
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return null;
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}
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}
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/**
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* @param {CSSStyleDeclaration} style
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* @param {string} propertyName
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* @param {string} value
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*/
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_setImposterStyle(style, propertyName, value) {
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style.setProperty(propertyName, value, 'important');
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}
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/**
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* @param {HTMLInputElement|HTMLTextAreaElement} element
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* @param {boolean} isTextarea
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* @returns {[imposter: ?HTMLDivElement, container: ?HTMLDivElement]}
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*/
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_createImposter(element, isTextarea) {
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const body = document.body;
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if (body === null) { return [null, null]; }
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const elementStyle = window.getComputedStyle(element);
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const elementRect = element.getBoundingClientRect();
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const documentRect = document.documentElement.getBoundingClientRect();
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let left = elementRect.left - documentRect.left;
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let top = elementRect.top - documentRect.top;
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// Container
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const container = document.createElement('div');
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const containerStyle = container.style;
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this._setImposterStyle(containerStyle, 'all', 'initial');
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this._setImposterStyle(containerStyle, 'position', 'absolute');
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this._setImposterStyle(containerStyle, 'left', '0');
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this._setImposterStyle(containerStyle, 'top', '0');
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this._setImposterStyle(containerStyle, 'width', `${documentRect.width}px`);
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this._setImposterStyle(containerStyle, 'height', `${documentRect.height}px`);
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this._setImposterStyle(containerStyle, 'overflow', 'hidden');
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this._setImposterStyle(containerStyle, 'opacity', '0');
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this._setImposterStyle(containerStyle, 'pointer-events', 'none');
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this._setImposterStyle(containerStyle, 'z-index', '2147483646');
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// Imposter
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const imposter = document.createElement('div');
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const imposterStyle = imposter.style;
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let value = element.value;
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if (value.endsWith('\n')) { value += '\n'; }
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imposter.textContent = value;
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for (let i = 0, ii = elementStyle.length; i < ii; ++i) {
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const property = elementStyle[i];
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this._setImposterStyle(imposterStyle, property, elementStyle.getPropertyValue(property));
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}
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this._setImposterStyle(imposterStyle, 'position', 'absolute');
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this._setImposterStyle(imposterStyle, 'top', `${top}px`);
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this._setImposterStyle(imposterStyle, 'left', `${left}px`);
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this._setImposterStyle(imposterStyle, 'margin', '0');
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this._setImposterStyle(imposterStyle, 'pointer-events', 'auto');
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if (isTextarea) {
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if (elementStyle.overflow === 'visible') {
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this._setImposterStyle(imposterStyle, 'overflow', 'auto');
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}
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} else {
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this._setImposterStyle(imposterStyle, 'overflow', 'hidden');
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this._setImposterStyle(imposterStyle, 'white-space', 'nowrap');
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this._setImposterStyle(imposterStyle, 'line-height', elementStyle.height);
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}
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container.appendChild(imposter);
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body.appendChild(container);
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// Adjust size
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const imposterRect = imposter.getBoundingClientRect();
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if (imposterRect.width !== elementRect.width || imposterRect.height !== elementRect.height) {
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const width = Number.parseFloat(elementStyle.width) + (elementRect.width - imposterRect.width);
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const height = Number.parseFloat(elementStyle.height) + (elementRect.height - imposterRect.height);
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this._setImposterStyle(imposterStyle, 'width', `${width}px`);
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this._setImposterStyle(imposterStyle, 'height', `${height}px`);
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}
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if (imposterRect.left !== elementRect.left || imposterRect.top !== elementRect.top) {
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left += (elementRect.left - imposterRect.left);
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top += (elementRect.top - imposterRect.top);
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this._setImposterStyle(imposterStyle, 'left', `${left}px`);
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this._setImposterStyle(imposterStyle, 'top', `${top}px`);
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}
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imposter.scrollTop = element.scrollTop;
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imposter.scrollLeft = element.scrollLeft;
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return [imposter, container];
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}
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/**
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* @param {number} x
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* @param {number} y
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* @param {boolean} all
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* @returns {Element[]}
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*/
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_getElementsFromPoint(x, y, all) {
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if (all) {
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// document.elementsFromPoint can return duplicates which must be removed.
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const elements = document.elementsFromPoint(x, y);
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return elements.filter((e, i) => elements.indexOf(e) === i);
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}
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const e = document.elementFromPoint(x, y);
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return e !== null ? [e] : [];
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}
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/**
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* @param {number} x
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* @param {number} y
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* @param {Range} range
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* @param {boolean} normalizeCssZoom
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* @param {?string} language
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* @returns {boolean}
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*/
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_isPointInRange(x, y, range, normalizeCssZoom, language) {
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// Require a text node to start
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const {startContainer} = range;
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if (startContainer.nodeType !== Node.TEXT_NODE) {
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return false;
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}
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// Convert CSS zoom coordinates
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if (normalizeCssZoom) {
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const scale = computeZoomScale(startContainer);
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x /= scale;
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y /= scale;
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}
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// Scan forward
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const nodePre = range.endContainer;
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const offsetPre = range.endOffset;
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try {
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const {node, offset, content} = new DOMTextScanner(nodePre, offsetPre, true, false).seek(1);
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range.setEnd(node, offset);
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if (!this._isWhitespace(content) && isPointInAnyRect(x, y, range.getClientRects(), language)) {
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return true;
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}
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} finally {
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range.setEnd(nodePre, offsetPre);
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}
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// Scan backward
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const {node, offset, content} = new DOMTextScanner(startContainer, range.startOffset, true, false).seek(-1);
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range.setStart(node, offset);
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if (!this._isWhitespace(content) && isPointInAnyRect(x, y, range.getClientRects(), language)) {
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// This purposefully leaves the starting offset as modified and sets the range length to 0.
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range.setEnd(node, offset);
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return true;
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}
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// No match
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return false;
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}
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/**
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* @param {number} x
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* @param {number} y
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* @returns {?Range}
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*/
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_caretRangeFromPoint(x, y) {
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if (typeof document.caretPositionFromPoint === 'function') {
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// Firefox
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// 128+ Chrome, Edge
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const caretPositionFromPointResult = this._caretPositionFromPoint(x, y);
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// Older Chromium based browsers (such as Kiwi) pretend to support `caretPositionFromPoint` but it doesn't work
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// Allow falling through if `caretPositionFromPointResult` is null to let `caretRangeFromPoint` be used in these cases
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if (caretPositionFromPointResult) {
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return caretPositionFromPointResult;
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}
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}
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if (typeof document.caretRangeFromPoint === 'function') {
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// Fallback Chrome, Edge
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return document.caretRangeFromPoint(x, y);
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}
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// No support
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return null;
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}
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/**
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* @param {Element | ShadowRoot} inputElement
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* @returns {ShadowRoot[]}
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*/
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_findShadowRoots(inputElement) {
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const allElements = [inputElement, ...inputElement.querySelectorAll('*')];
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/** @type {Element[]} */
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const shadowRootContainingElements = [];
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for (const element of allElements) {
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if (!(element instanceof ShadowRoot) && !!element.shadowRoot) {
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shadowRootContainingElements.push(element);
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}
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}
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/** @type {ShadowRoot[]} */
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const shadowRoots = [];
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for (const element of shadowRootContainingElements) {
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if (element.shadowRoot) {
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shadowRoots.push(element.shadowRoot);
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const nestedShadowRoots = this._findShadowRoots(element.shadowRoot);
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if (nestedShadowRoots) {
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shadowRoots.push(...nestedShadowRoots);
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}
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}
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}
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return shadowRoots;
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}
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/**
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* @param {number} x
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* @param {number} y
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* @returns {?Range}
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*/
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_caretPositionFromPoint(x, y) {
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const documentCaretPositionFromPoint = document.caretPositionFromPoint(x, y);
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const documentCaretPositionOffsetNode = documentCaretPositionFromPoint?.offsetNode;
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// nodeName `#text` indicates we have already drilled down as far as required to scan the text
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const shadowRootSearchRequired = documentCaretPositionOffsetNode instanceof Element && documentCaretPositionOffsetNode.nodeName !== '#text';
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const shadowRoots = shadowRootSearchRequired ? this._findShadowRoots(documentCaretPositionOffsetNode) : [];
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const position = shadowRoots.length > 0 ? document.caretPositionFromPoint(x, y, {shadowRoots: shadowRoots}) : documentCaretPositionFromPoint;
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if (position === null) {
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return null;
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}
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const node = position.offsetNode;
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if (node === null) {
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return null;
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}
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let offset = 0;
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const {nodeType} = node;
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switch (nodeType) {
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case Node.TEXT_NODE:
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offset = position.offset;
|
|
break;
|
|
case Node.ELEMENT_NODE:
|
|
// Elements with user-select: all will return the element
|
|
// instead of a text point inside the element.
|
|
if (this._isElementUserSelectAll(/** @type {Element} */ (node))) {
|
|
return this._caretPositionFromPointNormalizeStyles(x, y, /** @type {Element} */ (node));
|
|
}
|
|
break;
|
|
}
|
|
|
|
try {
|
|
const range = document.createRange();
|
|
range.setStart(node, offset);
|
|
range.setEnd(node, offset);
|
|
return range;
|
|
} catch (e) {
|
|
// Firefox throws new DOMException("The operation is insecure.")
|
|
// when trying to select a node from within a ShadowRoot.
|
|
return null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {number} x
|
|
* @param {number} y
|
|
* @param {Element} nextElement
|
|
* @returns {?Range}
|
|
*/
|
|
_caretPositionFromPointNormalizeStyles(x, y, nextElement) {
|
|
/** @type {Map<Element, ?string>} */
|
|
const previousStyles = new Map();
|
|
try {
|
|
while (true) {
|
|
if (nextElement instanceof HTMLElement) {
|
|
this._recordPreviousStyle(previousStyles, nextElement);
|
|
nextElement.style.setProperty('user-select', 'text', 'important');
|
|
}
|
|
|
|
const position = /** @type {(x: number, y: number) => ?{offsetNode: Node, offset: number}} */ (document.caretPositionFromPoint)(x, y);
|
|
if (position === null) {
|
|
return null;
|
|
}
|
|
const node = position.offsetNode;
|
|
if (node === null) {
|
|
return null;
|
|
}
|
|
|
|
let offset = 0;
|
|
const {nodeType} = node;
|
|
switch (nodeType) {
|
|
case Node.TEXT_NODE:
|
|
offset = position.offset;
|
|
break;
|
|
case Node.ELEMENT_NODE:
|
|
// Elements with user-select: all will return the element
|
|
// instead of a text point inside the element.
|
|
if (this._isElementUserSelectAll(/** @type {Element} */ (node))) {
|
|
if (previousStyles.has(/** @type {Element} */ (node))) {
|
|
// Recursive
|
|
return null;
|
|
}
|
|
nextElement = /** @type {Element} */ (node);
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
try {
|
|
const range = document.createRange();
|
|
range.setStart(node, offset);
|
|
range.setEnd(node, offset);
|
|
return range;
|
|
} catch (e) {
|
|
// Firefox throws new DOMException("The operation is insecure.")
|
|
// when trying to select a node from within a ShadowRoot.
|
|
return null;
|
|
}
|
|
}
|
|
} finally {
|
|
this._revertStyles(previousStyles);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {number} x
|
|
* @param {number} y
|
|
* @param {Element[]} elements
|
|
* @param {boolean} normalizeCssZoom
|
|
* @param {?string} language
|
|
* @returns {?Range}
|
|
*/
|
|
_caretRangeFromPointExt(x, y, elements, normalizeCssZoom, language) {
|
|
/** @type {?Map<Element, ?string>} */
|
|
let previousStyles = null;
|
|
try {
|
|
let i = 0;
|
|
let startContainerPre = null;
|
|
while (true) {
|
|
const range = this._caretRangeFromPoint(x, y);
|
|
if (range === null) {
|
|
return null;
|
|
}
|
|
|
|
const startContainer = range.startContainer;
|
|
if (startContainerPre !== startContainer) {
|
|
if (this._isPointInRange(x, y, range, normalizeCssZoom, language)) {
|
|
return range;
|
|
}
|
|
startContainerPre = startContainer;
|
|
}
|
|
|
|
if (previousStyles === null) { previousStyles = new Map(); }
|
|
i = this._disableTransparentElement(elements, i, previousStyles);
|
|
if (i < 0) {
|
|
return null;
|
|
}
|
|
}
|
|
} finally {
|
|
if (previousStyles !== null && previousStyles.size > 0) {
|
|
this._revertStyles(previousStyles);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {Element[]} elements
|
|
* @param {number} i
|
|
* @param {Map<Element, ?string>} previousStyles
|
|
* @returns {number}
|
|
*/
|
|
_disableTransparentElement(elements, i, previousStyles) {
|
|
while (true) {
|
|
if (i >= elements.length) {
|
|
return -1;
|
|
}
|
|
|
|
const element = elements[i++];
|
|
if (this._isElementTransparent(element)) {
|
|
if (element instanceof HTMLElement) {
|
|
this._recordPreviousStyle(previousStyles, element);
|
|
element.style.setProperty('pointer-events', 'none', 'important');
|
|
}
|
|
return i;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {Map<Element, ?string>} previousStyles
|
|
* @param {Element} element
|
|
*/
|
|
_recordPreviousStyle(previousStyles, element) {
|
|
if (previousStyles.has(element)) { return; }
|
|
const style = element.hasAttribute('style') ? element.getAttribute('style') : null;
|
|
previousStyles.set(element, style);
|
|
}
|
|
|
|
/**
|
|
* @param {Map<Element, ?string>} previousStyles
|
|
*/
|
|
_revertStyles(previousStyles) {
|
|
for (const [element, style] of previousStyles.entries()) {
|
|
if (style === null) {
|
|
element.removeAttribute('style');
|
|
} else {
|
|
element.setAttribute('style', style);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {Element} element
|
|
* @returns {boolean}
|
|
*/
|
|
_isElementTransparent(element) {
|
|
if (
|
|
element === document.body ||
|
|
element === document.documentElement
|
|
) {
|
|
return false;
|
|
}
|
|
const style = window.getComputedStyle(element);
|
|
return (
|
|
Number.parseFloat(style.opacity) <= 0 ||
|
|
style.visibility === 'hidden' ||
|
|
(style.backgroundImage === 'none' && this._isColorTransparent(style.backgroundColor))
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @param {string} cssColor
|
|
* @returns {boolean}
|
|
*/
|
|
_isColorTransparent(cssColor) {
|
|
return this._transparentColorPattern.test(cssColor);
|
|
}
|
|
|
|
/**
|
|
* @param {Element} element
|
|
* @returns {boolean}
|
|
*/
|
|
_isElementUserSelectAll(element) {
|
|
return getComputedStyle(element).userSelect === 'all';
|
|
}
|
|
|
|
/**
|
|
* @param {string} string
|
|
* @returns {boolean}
|
|
*/
|
|
_isWhitespace(string) {
|
|
return string.trim().length === 0;
|
|
}
|
|
}
|