Use a cached value for checking if the browser is Firefox. Only validate and set up document.caretRangeFromPoint once. Use switch for multiple comparisons on the same value.
193 lines
6.0 KiB
JavaScript
193 lines
6.0 KiB
JavaScript
/*
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* Copyright (C) 2016-2017 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 <http://www.gnu.org/licenses/>.
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*/
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const IS_FIREFOX = /Firefox/.test(navigator.userAgent);
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function docOffsetCalc(element) {
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const scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
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const scrollLeft = window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft;
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const clientTop = document.documentElement.clientTop || document.body.clientTop || 0;
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const clientLeft = document.documentElement.clientLeft || document.body.clientLeft || 0;
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const rect = element.getBoundingClientRect();
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const top = Math.round(rect.top + scrollTop - clientTop);
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const left = Math.round(rect.left + scrollLeft - clientLeft);
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return {top, left};
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}
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function docImposterCreate(element) {
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const styleProps = window.getComputedStyle(element);
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const stylePairs = [];
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for (const key of styleProps) {
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stylePairs.push(`${key}: ${styleProps[key]};`);
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}
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const offset = docOffsetCalc(element);
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const imposter = document.createElement('div');
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imposter.className = 'yomichan-imposter';
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imposter.innerText = element.value;
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imposter.style.cssText = stylePairs.join('\n');
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imposter.style.position = 'absolute';
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imposter.style.top = `${offset.top}px`;
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imposter.style.left = `${offset.left}px`;
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imposter.style.opacity = 0;
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imposter.style.zIndex = 2147483646;
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if (element.nodeName === 'TEXTAREA' && styleProps.overflow === 'visible') {
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imposter.style.overflow = 'auto';
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}
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document.body.appendChild(imposter);
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imposter.scrollTop = element.scrollTop;
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imposter.scrollLeft = element.scrollLeft;
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return imposter;
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}
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function docImposterDestroy() {
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for (const element of document.getElementsByClassName('yomichan-imposter')) {
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element.parentNode.removeChild(element);
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}
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}
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function docRangeFromPoint(point) {
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const element = document.elementFromPoint(point.x, point.y);
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let imposter = null;
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if (element) {
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switch (element.nodeName) {
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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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case 'TEXTAREA':
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imposter = docImposterCreate(element);
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break;
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}
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}
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const range = document.caretRangeFromPoint(point.x, point.y);
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if (imposter !== null) {
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imposter.style.zIndex = -2147483646;
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}
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return range !== null && isPointInRange(point, range) ? new TextSourceRange(range) : null;
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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 = [quotesBwd[c]].concat(quoteStack);
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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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}
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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 = [quotesFwd[c]].concat(quoteStack);
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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(point, range) {
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if (IS_FIREFOX) {
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// Always return true on Firefox due to an issue where range.getClientRects()
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// does not return a correct set of rects for characters at the beginning of a line.
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return true;
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}
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const y = point.y - 2;
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for (const rect of range.getClientRects()) {
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if (y <= rect.bottom) {
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return true;
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}
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}
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return false;
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}
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if (typeof document.caretRangeFromPoint !== 'function') {
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document.caretRangeFromPoint = (x, y) => {
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const position = document.caretPositionFromPoint(x, y);
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if (position && position.offsetNode && position.offsetNode.nodeType === Node.TEXT_NODE) {
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const range = document.createRange();
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range.setStart(position.offsetNode, position.offset);
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range.setEnd(position.offsetNode, position.offset);
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return range;
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}
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return null;
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};
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}
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