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/*
* 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/>.
*/
function docOffsetCalc(element) {
const scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
const scrollLeft = window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft;
const clientTop = document.documentElement.clientTop || document.body.clientTop || 0;
const clientLeft = document.documentElement.clientLeft || document.body.clientLeft || 0;
const rect = element.getBoundingClientRect();
const top = Math.round(rect.top + scrollTop - clientTop);
const left = Math.round(rect.left + scrollLeft - clientLeft);
return {top, left};
}
function docImposterCreate(element) {
const styleProps = window.getComputedStyle(element);
const stylePairs = [];
for (const key of styleProps) {
stylePairs.push(`${key}: ${styleProps[key]};`);
}
const offset = docOffsetCalc(element);
const imposter = document.createElement('div');
imposter.className = 'yomichan-imposter';
imposter.innerText = element.value;
imposter.style.cssText = stylePairs.join('\n');
imposter.style.position = 'absolute';
imposter.style.top = `${offset.top}px`;
imposter.style.left = `${offset.left}px`;
imposter.style.opacity = 0;
imposter.style.zIndex = 2147483646;
if (element.nodeName === 'TEXTAREA' && styleProps.overflow === 'visible') {
imposter.style.overflow = 'auto';
}
document.body.appendChild(imposter);
imposter.scrollTop = element.scrollTop;
imposter.scrollLeft = element.scrollLeft;
return imposter;
}
function docImposterDestroy() {
for (const element of document.getElementsByClassName('yomichan-imposter')) {
element.parentNode.removeChild(element);
}
}
function docRangeFromPoint(point) {
const element = document.elementFromPoint(point.x, point.y);
let imposter = null;
if (element) {
if (element.nodeName === 'IMG' || element.nodeName === 'BUTTON') {
return new TextSourceElement(element);
} else if (element.nodeName === 'INPUT' || element.nodeName === 'TEXTAREA') {
imposter = docImposterCreate(element);
}
}
if (!document.caretRangeFromPoint) {
document.caretRangeFromPoint = (x, y) => {
const position = document.caretPositionFromPoint(x,y);
if (position && position.offsetNode && position.offsetNode.nodeType === Node.TEXT_NODE) {
const range = document.createRange();
range.setStart(position.offsetNode, position.offset);
range.setEnd(position.offsetNode, position.offset);
return range;
}
return null;
};
}
const range = document.caretRangeFromPoint(point.x, point.y);
if (range === null) {
return;
}
if(imposter !== null) imposter.style.zIndex = -2147483646;
const rects = range.getClientRects();
for (const rect of rects) {
if (point.y <= rect.bottom + 2) {
return new TextSourceRange(range);
}
}
if (navigator.userAgent.match(/Firefox/)) {
return new TextSourceRange(range);
}
}
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 = [quotesBwd[c]].concat(quoteStack);
}
}
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 = [quotesFwd[c]].concat(quoteStack);
}
}
const text = content.substring(startPos, endPos);
const padding = text.length - text.replace(/^\s+/, '').length;
return {
text: text.trim(),
offset: position - startPos - padding
};
}
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