/* * Copyright (C) 2016-2017 Alex Yatskov <alex@foosoft.net> * Author: Alex Yatskov <alex@foosoft.net> * * 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 <http://www.gnu.org/licenses/>. */ const REGEX_TRANSPARENT_COLOR = /rgba\s*\([^)]*,\s*0(?:\.0+)?\s*\)/; function docSetImposterStyle(style, propertyName, value) { style.setProperty(propertyName, value, 'important'); } function docImposterCreate(element, isTextarea) { const elementStyle = window.getComputedStyle(element); const elementRect = element.getBoundingClientRect(); const documentRect = document.documentElement.getBoundingClientRect(); let left = elementRect.left - documentRect.left; let top = elementRect.top - documentRect.top; // Container const container = document.createElement('div'); const containerStyle = container.style; docSetImposterStyle(containerStyle, 'all', 'initial'); docSetImposterStyle(containerStyle, 'position', 'absolute'); docSetImposterStyle(containerStyle, 'left', '0'); docSetImposterStyle(containerStyle, 'top', '0'); docSetImposterStyle(containerStyle, 'width', `${documentRect.width}px`); docSetImposterStyle(containerStyle, 'height', `${documentRect.height}px`); docSetImposterStyle(containerStyle, 'overflow', 'hidden'); docSetImposterStyle(containerStyle, 'opacity', '0'); docSetImposterStyle(containerStyle, 'pointer-events', 'none'); docSetImposterStyle(containerStyle, 'z-index', '2147483646'); // Imposter const imposter = document.createElement('div'); const imposterStyle = imposter.style; imposter.innerText = element.value; for (let i = 0, ii = elementStyle.length; i < ii; ++i) { const property = elementStyle[i]; docSetImposterStyle(imposterStyle, property, elementStyle.getPropertyValue(property)); } docSetImposterStyle(imposterStyle, 'position', 'absolute'); docSetImposterStyle(imposterStyle, 'top', `${top}px`); docSetImposterStyle(imposterStyle, 'left', `${left}px`); docSetImposterStyle(imposterStyle, 'margin', '0'); docSetImposterStyle(imposterStyle, 'pointer-events', 'auto'); if (isTextarea) { if (elementStyle.overflow === 'visible') { docSetImposterStyle(imposterStyle, 'overflow', 'auto'); } } else { docSetImposterStyle(imposterStyle, 'overflow', 'hidden'); docSetImposterStyle(imposterStyle, 'white-space', 'nowrap'); docSetImposterStyle(imposterStyle, 'line-height', elementStyle.height); } container.appendChild(imposter); document.body.appendChild(container); // Adjust size const imposterRect = imposter.getBoundingClientRect(); if (imposterRect.width !== elementRect.width || imposterRect.height !== elementRect.height) { const width = parseFloat(elementStyle.width) + (elementRect.width - imposterRect.width); const height = parseFloat(elementStyle.height) + (elementRect.height - imposterRect.height); docSetImposterStyle(imposterStyle, 'width', `${width}px`); docSetImposterStyle(imposterStyle, 'height', `${height}px`); } if (imposterRect.x !== elementRect.x || imposterRect.y !== elementRect.y) { left += (elementRect.left - imposterRect.left); top += (elementRect.top - imposterRect.top); docSetImposterStyle(imposterStyle, 'left', `${left}px`); docSetImposterStyle(imposterStyle, 'top', `${top}px`); } imposter.scrollTop = element.scrollTop; imposter.scrollLeft = element.scrollLeft; return [imposter, container]; } function docElementsFromPoint(x, y, all) { if (all) { // document.elementsFromPoint can return duplicates which must be removed. const elements = document.elementsFromPoint(x, y); return elements.filter((e, i) => elements.indexOf(e) === i); } const e = document.elementFromPoint(x, y); return e !== null ? [e] : []; } function docRangeFromPoint(x, y, deepDomScan) { const elements = docElementsFromPoint(x, y, deepDomScan); let imposter = null; let imposterContainer = null; if (elements.length > 0) { const element = elements[0]; switch (element.nodeName.toUpperCase()) { case 'IMG': case 'BUTTON': return new TextSourceElement(element); case 'INPUT': [imposter, imposterContainer] = docImposterCreate(element, false); break; case 'TEXTAREA': [imposter, imposterContainer] = docImposterCreate(element, true); break; } } const range = caretRangeFromPointExt(x, y, deepDomScan ? elements : []); if (range !== null) { if (imposter !== null) { docSetImposterStyle(imposterContainer.style, 'z-index', '-2147483646'); docSetImposterStyle(imposter.style, 'pointer-events', 'none'); } return new TextSourceRange(range, '', imposterContainer); } else { if (imposterContainer !== null) { imposterContainer.parentNode.removeChild(imposterContainer); } return null; } } function docSentenceExtract(source, extent) { const quotesFwd = {'「': '」', '『': '』', "'": "'", '"': '"'}; const quotesBwd = {'」': '「', '』': '『', "'": "'", '"': '"'}; const terminators = '…。..??!!'; const sourceLocal = source.clone(); const position = sourceLocal.setStartOffset(extent); sourceLocal.setEndOffset(position + extent); const content = sourceLocal.text(); let quoteStack = []; let startPos = 0; for (let i = position; i >= startPos; --i) { const c = content[i]; if (c === '\n') { startPos = i + 1; break; } if (quoteStack.length === 0 && (terminators.includes(c) || c in quotesFwd)) { startPos = i + 1; break; } if (quoteStack.length > 0 && c === quoteStack[0]) { quoteStack.pop(); } else if (c in quotesBwd) { quoteStack.unshift(quotesBwd[c]); } } quoteStack = []; let endPos = content.length; for (let i = position; i <= endPos; ++i) { const c = content[i]; if (c === '\n') { endPos = i + 1; break; } if (quoteStack.length === 0) { if (terminators.includes(c)) { endPos = i + 1; break; } else if (c in quotesBwd) { endPos = i; break; } } if (quoteStack.length > 0 && c === quoteStack[0]) { quoteStack.pop(); } else if (c in quotesFwd) { quoteStack.unshift(quotesFwd[c]); } } const text = content.substring(startPos, endPos); const padding = text.length - text.replace(/^\s+/, '').length; return { text: text.trim(), offset: position - startPos - padding }; } function isPointInRange(x, y, range) { // Require a text node to start if (range.startContainer.nodeType !== Node.TEXT_NODE) { return false; } // Scan forward const nodePre = range.endContainer; const offsetPre = range.endOffset; try { const {node, offset, content} = TextSourceRange.seekForward(range.endContainer, range.endOffset, 1); range.setEnd(node, offset); if (!isWhitespace(content) && DOM.isPointInAnyRect(x, y, range.getClientRects())) { return true; } } finally { range.setEnd(nodePre, offsetPre); } // Scan backward const {node, offset, content} = TextSourceRange.seekBackward(range.startContainer, range.startOffset, 1); range.setStart(node, offset); if (!isWhitespace(content) && DOM.isPointInAnyRect(x, y, range.getClientRects())) { // This purposefully leaves the starting offset as modified and sets the range length to 0. range.setEnd(node, offset); return true; } // No match return false; } function isWhitespace(string) { return string.trim().length === 0; } const caretRangeFromPoint = (() => { if (typeof document.caretRangeFromPoint === 'function') { // Chrome, Edge return (x, y) => document.caretRangeFromPoint(x, y); } if (typeof document.caretPositionFromPoint === 'function') { // Firefox return (x, y) => { const position = document.caretPositionFromPoint(x, y); if (position === null) { return null; } const node = position.offsetNode; if (node === null) { return null; } const range = document.createRange(); const offset = (node.nodeType === Node.TEXT_NODE ? position.offset : 0); range.setStart(node, offset); range.setEnd(node, offset); return range; }; } // No support return () => null; })(); function caretRangeFromPointExt(x, y, elements) { const modifications = []; try { let i = 0; let startContinerPre = null; while (true) { const range = caretRangeFromPoint(x, y); if (range === null) { return null; } const startContainer = range.startContainer; if (startContinerPre !== startContainer) { if (isPointInRange(x, y, range)) { return range; } startContinerPre = startContainer; } i = disableTransparentElement(elements, i, modifications); if (i < 0) { return null; } } } finally { if (modifications.length > 0) { restoreElementStyleModifications(modifications); } } } function disableTransparentElement(elements, i, modifications) { while (true) { if (i >= elements.length) { return -1; } const element = elements[i++]; if (isElementTransparent(element)) { const style = element.hasAttribute('style') ? element.getAttribute('style') : null; modifications.push({element, style}); element.style.setProperty('pointer-events', 'none', 'important'); return i; } } } function restoreElementStyleModifications(modifications) { for (const {element, style} of modifications) { if (style === null) { element.removeAttribute('style'); } else { element.setAttribute('style', style); } } } function isElementTransparent(element) { if ( element === document.body || element === document.documentElement ) { return false; } const style = window.getComputedStyle(element); return ( parseFloat(style.opacity) <= 0 || style.visibility === 'hidden' || (style.backgroundImage === 'none' && isColorTransparent(style.backgroundColor)) ); } function isColorTransparent(cssColor) { return REGEX_TRANSPARENT_COLOR.test(cssColor); }