/*
*
* 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/>.
*/
const REGEX_TRANSPARENT_COLOR = /rgba\s*\([^\)]*,\s*0(?:\.0+)?\s*\)/;
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];
}
function docRangeFromPoint({x, y}, options) {
const elements = document.elementsFromPoint(x, y);
let imposter = null;
let imposterContainer = null;
if (elements.length > 0) {
const element = elements[0];
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;
}
}
const range = caretRangeFromPointExt(x, y, options.scanning.deepDomScan ? elements : []);
if (range !== null) {
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;
}
}
function docSentenceExtract(source, extent) {
//const quotesFwd = {'「': '」', '『': '』', "'": "'", '"': '"'};
//const quotesBwd = {'」': '「', '』': '『', "'": "'", '"': '"'};
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 noStart = 4;
let noEnd = 2;
let startPos = 0;
for (let i = position; i >= startPos; --i) {
const c = content[i];
if (c === '\n') {
if(noStart == 0) {
startPos = i + 1;
break;
} else {
//noStart--;
}
}
if (quoteStack.length === 0 && (terminators.includes(c) || c in quotesFwd)) {
if(noStart == 0) {
startPos = i + 1;
break;
}
else {
noStart--;
}
}
if (quoteStack.length > 0 && c === quoteStack[0]) {
quoteStack.pop();
} else if (c in quotesBwd) {
quoteStack.unshift(quotesBwd[c]);
}
}
quoteStack = [];
let endPos = content.length;
for (let i = position; i <= endPos; ++i) {
const c = content[i];
if (c === '\n') {
if (noEnd == 0) {
endPos = i + 1;
break;
} else {
//noEnd--;
}
}
if (quoteStack.length === 0) {
if (terminators.includes(c)) {
if(noEnd == 0) {
endPos = i + 1;
break;
} else {
noEnd--;
}
}
else if (c in quotesBwd) {
if(noEnd == 0){
endPos = i;
break;
} else {
noEnd--;
}
}
}
if (quoteStack.length > 0 && c === quoteStack[0]) {
quoteStack.pop();
} else if (c in quotesFwd) {
quoteStack.unshift(quotesFwd[c]);
}
}
const text = content.substring(startPos, endPos);
const padding = text.length - text.replace(/^\s+/, '').length;
return {
text: text.trim(),
offset: position - startPos - padding
};
}
function isPointInRange(x, y, range) {
// Require a text node to start
if (range.startContainer.nodeType !== Node.TEXT_NODE) {
return false;
}
// Scan forward
const nodePre = range.endContainer;
const offsetPre = range.endOffset;
try {
const {node, offset, content} = TextSourceRange.seekForward(range.endContainer, range.endOffset, 1);
range.setEnd(node, offset);
if (!isWhitespace(content) && isPointInAnyRect(x, y, range.getClientRects())) {
return true;
}
} finally {
range.setEnd(nodePre, offsetPre);
}
// Scan backward
const {node, offset, content} = TextSourceRange.seekBackward(range.startContainer, range.startOffset, 1);
range.setStart(node, offset);
if (!isWhitespace(content) && isPointInAnyRect(x, y, range.getClientRects())) {
// This purposefully leaves the starting offset as modified and sets the range length to 0.
range.setEnd(node, offset);
return true;
}
// No match
return false;
}
function isWhitespace(string) {
return string.trim().length === 0;
}
function isPointInAnyRect(x, y, rects) {
for (const rect of rects) {
if (isPointInRect(x, y, rect)) {
return true;
}
}
return false;
}
function isPointInRect(x, y, rect) {
return (
x >= rect.left && x < rect.right &&
y >= rect.top && y < rect.bottom);
}
const caretRangeFromPoint = (() => {
if (typeof document.caretRangeFromPoint === 'function') {
// Chrome, Edge
return (x, y) => document.caretRangeFromPoint(x, y);
}
if (typeof document.caretPositionFromPoint === 'function') {
// Firefox
return (x, y) => {
const position = document.caretPositionFromPoint(x, y);
const node = position.offsetNode;
if (node === null) {
return null;
}
const range = document.createRange();
const offset = (node.nodeType === Node.TEXT_NODE ? position.offset : 0);
range.setStart(node, offset);
range.setEnd(node, offset);
return range;
};
}
// No support
return () => null;
})();
function caretRangeFromPointExt(x, y, elements) {
const modifications = [];
try {
let i = 0;
let startContinerPre = null;
while (true) {
const range = caretRangeFromPoint(x, y);
if (range === null) {
return null;
}
const startContainer = range.startContainer;
if (startContinerPre !== startContainer) {
if (isPointInRange(x, y, range)) {
return range;
}
startContinerPre = startContainer;
}
i = disableTransparentElement(elements, i, modifications);
if (i < 0) {
return null;
}
}
} finally {
if (modifications.length > 0) {
restoreElementStyleModifications(modifications);
}
}
}
function disableTransparentElement(elements, i, modifications) {
while (true) {
if (i >= elements.length) {
return -1;
}
const element = elements[i++];
if (isElementTransparent(element)) {
const style = element.hasAttribute('style') ? element.getAttribute('style') : null;
modifications.push({element, style});
element.style.pointerEvents = 'none';
return i;
}
}
}
function restoreElementStyleModifications(modifications) {
for (const {element, style} of modifications) {
if (style === null) {
element.removeAttribute('style');
} else {
element.setAttribute('style', style);
}
}
}
function isElementTransparent(element) {
if (
element === document.body ||
element === document.documentElement
) {
return false;
}
const style = window.getComputedStyle(element);
return (
parseFloat(style.opacity) < 0 ||
style.visibility === 'hidden' ||
(style.backgroundImage === 'none' && isColorTransparent(style.backgroundColor))
);
}
function isColorTransparent(cssColor) {
return REGEX_TRANSPARENT_COLOR.test(cssColor);
}
