178 lines
5.7 KiB
JavaScript
178 lines
5.7 KiB
JavaScript
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/*
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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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import {TextSourceRange, TextSourceElement} from './source.module.js';
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export 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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export 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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export 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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export 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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if (element.nodeName === 'IMG' || element.nodeName === 'BUTTON') {
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return new TextSourceElement(element);
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} else if (element.nodeName === 'INPUT' || element.nodeName === 'TEXTAREA') {
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imposter = docImposterCreate(element);
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}
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}
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if (!document.caretRangeFromPoint) {
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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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const range = document.caretRangeFromPoint(point.x, point.y);
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if (range === null) {
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return;
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}
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if(imposter !== null) imposter.style.zIndex = -2147483646;
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const rects = range.getClientRects();
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for (const rect of rects) {
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if (point.y <= rect.bottom + 2) {
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return new TextSourceRange(range);
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}
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}
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}
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export 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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