yomichan/ext/fg/js/document.js

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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>
*
* 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 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();
const left = elementRect.left - documentRect.left;
const 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`);
}
imposter.scrollTop = element.scrollTop;
imposter.scrollLeft = element.scrollLeft;
return [imposter, container];
}
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function docRangeFromPoint(point) {
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const element = document.elementFromPoint(point.x, point.y);
let imposter = null;
let imposterContainer = null;
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if (element) {
switch (element.nodeName) {
case 'IMG':
case 'BUTTON':
return new TextSourceElement(element);
case 'INPUT':
[imposter, imposterContainer] = docImposterCreate(element, false);
break;
case 'TEXTAREA':
[imposter, imposterContainer] = docImposterCreate(element, true);
break;
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}
}
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const range = document.caretRangeFromPoint(point.x, point.y);
if (range !== null && isPointInRange(point, range)) {
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;
}
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}
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function docSentenceExtract(source, extent) {
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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];
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if (c === '\n') {
startPos = i + 1;
break;
}
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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 = [];
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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') {
endPos = i + 1;
break;
}
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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);
}
}
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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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}
function isPointInRange(point, range) {
// Scan forward
const nodePre = range.endContainer;
const offsetPre = range.endOffset;
try {
const {node, offset} = TextSourceRange.seekForward(range.endContainer, range.endOffset, 1);
range.setEnd(node, offset);
if (isPointInAnyRect(point, range.getClientRects())) {
return true;
}
} finally {
range.setEnd(nodePre, offsetPre);
}
// Scan backward
const {node, offset} = TextSourceRange.seekBackward(range.startContainer, range.startOffset, 1);
range.setStart(node, offset);
if (isPointInAnyRect(point, range.getClientRects())) {
// This purposefully leaves the starting offset as modified and sets teh range length to 0.
range.setEnd(node, offset);
return true;
}
// No match
return false;
}
function isPointInAnyRect(point, rects) {
for (const rect of rects) {
if (isPointInRect(point, rect)) {
return true;
}
}
return false;
}
function isPointInRect(point, rect) {
return (
point.x >= rect.left && point.x < rect.right &&
point.y >= rect.top && point.y < rect.bottom);
}
if (typeof document.caretRangeFromPoint !== 'function') {
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;
};
}