368 lines
12 KiB
JavaScript
368 lines
12 KiB
JavaScript
/*
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* Copyright (C) 2016-2020 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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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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/*global TextSourceElement, TextSourceRange, DOM*/
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const REGEX_TRANSPARENT_COLOR = /rgba\s*\([^)]*,\s*0(?:\.0+)?\s*\)/;
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function docSetImposterStyle(style, propertyName, value) {
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style.setProperty(propertyName, value, 'important');
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}
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function docImposterCreate(element, isTextarea) {
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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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docSetImposterStyle(containerStyle, 'all', 'initial');
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docSetImposterStyle(containerStyle, 'position', 'absolute');
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docSetImposterStyle(containerStyle, 'left', '0');
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docSetImposterStyle(containerStyle, 'top', '0');
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docSetImposterStyle(containerStyle, 'width', `${documentRect.width}px`);
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docSetImposterStyle(containerStyle, 'height', `${documentRect.height}px`);
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docSetImposterStyle(containerStyle, 'overflow', 'hidden');
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docSetImposterStyle(containerStyle, 'opacity', '0');
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docSetImposterStyle(containerStyle, 'pointer-events', 'none');
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docSetImposterStyle(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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docSetImposterStyle(imposterStyle, property, elementStyle.getPropertyValue(property));
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}
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docSetImposterStyle(imposterStyle, 'position', 'absolute');
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docSetImposterStyle(imposterStyle, 'top', `${top}px`);
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docSetImposterStyle(imposterStyle, 'left', `${left}px`);
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docSetImposterStyle(imposterStyle, 'margin', '0');
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docSetImposterStyle(imposterStyle, 'pointer-events', 'auto');
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if (isTextarea) {
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if (elementStyle.overflow === 'visible') {
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docSetImposterStyle(imposterStyle, 'overflow', 'auto');
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}
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} else {
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docSetImposterStyle(imposterStyle, 'overflow', 'hidden');
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docSetImposterStyle(imposterStyle, 'white-space', 'nowrap');
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docSetImposterStyle(imposterStyle, 'line-height', elementStyle.height);
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}
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container.appendChild(imposter);
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document.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 = parseFloat(elementStyle.width) + (elementRect.width - imposterRect.width);
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const height = parseFloat(elementStyle.height) + (elementRect.height - imposterRect.height);
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docSetImposterStyle(imposterStyle, 'width', `${width}px`);
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docSetImposterStyle(imposterStyle, 'height', `${height}px`);
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}
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if (imposterRect.x !== elementRect.x || imposterRect.y !== elementRect.y) {
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left += (elementRect.left - imposterRect.left);
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top += (elementRect.top - imposterRect.top);
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docSetImposterStyle(imposterStyle, 'left', `${left}px`);
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docSetImposterStyle(imposterStyle, 'top', `${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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function docElementsFromPoint(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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function docRangeFromPoint(x, y, deepDomScan) {
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const elements = docElementsFromPoint(x, y, deepDomScan);
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let imposter = null;
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let imposterContainer = null;
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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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return new TextSourceElement(element);
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case 'INPUT':
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imposterSourceElement = element;
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[imposter, imposterContainer] = docImposterCreate(element, false);
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break;
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case 'TEXTAREA':
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imposterSourceElement = element;
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[imposter, imposterContainer] = docImposterCreate(element, true);
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break;
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}
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}
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const range = caretRangeFromPointExt(x, y, deepDomScan ? elements : []);
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if (range !== null) {
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if (imposter !== null) {
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docSetImposterStyle(imposterContainer.style, 'z-index', '-2147483646');
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docSetImposterStyle(imposter.style, 'pointer-events', 'none');
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}
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return new TextSourceRange(range, '', imposterContainer, imposterSourceElement);
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} else {
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if (imposterContainer !== null) {
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imposterContainer.parentNode.removeChild(imposterContainer);
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}
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return null;
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}
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}
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function docSentenceExtract(source, extent) {
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const quotesFwd = {'「': '」', '『': '』', "'": "'", '"': '"'};
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const quotesBwd = {'」': '「', '』': '『', "'": "'", '"': '"'};
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const terminators = '…。．.？?！!';
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const sourceLocal = source.clone();
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const position = sourceLocal.setStartOffset(extent);
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sourceLocal.setEndOffset(position + extent);
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const content = sourceLocal.text();
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let quoteStack = [];
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let startPos = 0;
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for (let i = position; i >= startPos; --i) {
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const c = content[i];
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if (c === '\n') {
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startPos = i + 1;
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break;
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}
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if (quoteStack.length === 0 && (terminators.includes(c) || c in quotesFwd)) {
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startPos = i + 1;
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break;
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}
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if (quoteStack.length > 0 && c === quoteStack[0]) {
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quoteStack.pop();
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} else if (c in quotesBwd) {
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quoteStack.unshift(quotesBwd[c]);
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}
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}
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quoteStack = [];
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let endPos = content.length;
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for (let i = position; i <= endPos; ++i) {
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const c = content[i];
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if (c === '\n') {
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endPos = i + 1;
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break;
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}
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if (quoteStack.length === 0) {
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if (terminators.includes(c)) {
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endPos = i + 1;
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break;
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} else if (c in quotesBwd) {
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endPos = i;
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break;
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}
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}
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if (quoteStack.length > 0 && c === quoteStack[0]) {
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quoteStack.pop();
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} else if (c in quotesFwd) {
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quoteStack.unshift(quotesFwd[c]);
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}
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}
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const text = content.substring(startPos, endPos);
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const padding = text.length - text.replace(/^\s+/, '').length;
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return {
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text: text.trim(),
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offset: position - startPos - padding
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};
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}
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function isPointInRange(x, y, range) {
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// Require a text node to start
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if (range.startContainer.nodeType !== Node.TEXT_NODE) {
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return false;
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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} = TextSourceRange.seekForward(range.endContainer, range.endOffset, 1);
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range.setEnd(node, offset);
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if (!isWhitespace(content) && DOM.isPointInAnyRect(x, y, range.getClientRects())) {
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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} = TextSourceRange.seekBackward(range.startContainer, range.startOffset, 1);
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range.setStart(node, offset);
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if (!isWhitespace(content) && DOM.isPointInAnyRect(x, y, range.getClientRects())) {
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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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function isWhitespace(string) {
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return string.trim().length === 0;
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}
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const caretRangeFromPoint = (() => {
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if (typeof document.caretRangeFromPoint === 'function') {
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// Chrome, Edge
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return (x, y) => document.caretRangeFromPoint(x, y);
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}
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if (typeof document.caretPositionFromPoint === 'function') {
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// Firefox
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return (x, y) => {
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const position = document.caretPositionFromPoint(x, y);
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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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const range = document.createRange();
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const offset = (node.nodeType === Node.TEXT_NODE ? position.offset : 0);
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try {
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range.setStart(node, offset);
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range.setEnd(node, offset);
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} catch (e) {
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// Firefox throws new DOMException("The operation is insecure.")
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// when trying to select a node from within a ShadowRoot.
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return null;
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}
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return range;
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};
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}
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// No support
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return () => null;
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})();
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function caretRangeFromPointExt(x, y, elements) {
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const modifications = [];
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try {
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let i = 0;
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let startContinerPre = null;
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while (true) {
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const range = caretRangeFromPoint(x, y);
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if (range === null) {
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return null;
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}
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const startContainer = range.startContainer;
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if (startContinerPre !== startContainer) {
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if (isPointInRange(x, y, range)) {
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return range;
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}
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startContinerPre = startContainer;
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}
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i = disableTransparentElement(elements, i, modifications);
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if (i < 0) {
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return null;
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}
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}
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} finally {
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if (modifications.length > 0) {
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restoreElementStyleModifications(modifications);
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}
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}
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}
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function disableTransparentElement(elements, i, modifications) {
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while (true) {
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if (i >= elements.length) {
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return -1;
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}
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const element = elements[i++];
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if (isElementTransparent(element)) {
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const style = element.hasAttribute('style') ? element.getAttribute('style') : null;
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modifications.push({element, style});
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element.style.setProperty('pointer-events', 'none', 'important');
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return i;
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}
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}
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}
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function restoreElementStyleModifications(modifications) {
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for (const {element, style} of modifications) {
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if (style === null) {
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element.removeAttribute('style');
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} else {
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element.setAttribute('style', style);
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}
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}
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}
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function isElementTransparent(element) {
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if (
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element === document.body ||
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element === document.documentElement
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) {
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return false;
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}
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const style = window.getComputedStyle(element);
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return (
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parseFloat(style.opacity) <= 0 ||
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style.visibility === 'hidden' ||
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(style.backgroundImage === 'none' && isColorTransparent(style.backgroundColor))
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);
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}
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function isColorTransparent(cssColor) {
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return REGEX_TRANSPARENT_COLOR.test(cssColor);
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}
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