yomichan/ext/fg/js/document.js
Roderic Day 5502bf8aed Place nodeType checks inside caretRangeFromPoint function
Checked that it does not un-fix #80
Squelches alerts (but does not fix underlying issue) for #89
2017-10-13 15:12:41 -04:00

164 lines
5.3 KiB
JavaScript
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/*
* 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;
}
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);
if (element) {
if (element.nodeName === 'IMG' || element.nodeName === 'BUTTON') {
return new TextSourceElement(element);
} else if (element.nodeName === 'INPUT' || element.nodeName === 'TEXTAREA') {
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;
}
};
}
const range = document.caretRangeFromPoint(point.x, point.y);
if (range) {
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
};
}