yomichan/ext/fg/js/source.js

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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>
*
* 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/>.
*/
// \u200c (Zero-width non-joiner) appears on Google Docs from Chrome 76 onwards
const IGNORE_TEXT_PATTERN = /\u200c/;
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/*
* TextSourceRange
*/
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class TextSourceRange {
constructor(range, content, imposterContainer) {
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this.range = range;
this.content = content;
this.imposterContainer = imposterContainer;
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}
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clone() {
return new TextSourceRange(this.range.cloneRange(), this.content, this.imposterContainer);
}
cleanup() {
if (this.imposterContainer !== null && this.imposterContainer.parentNode !== null) {
this.imposterContainer.parentNode.removeChild(this.imposterContainer);
}
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}
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text() {
return this.content;
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}
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setEndOffset(length) {
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const state = TextSourceRange.seekForward(this.range.startContainer, this.range.startOffset, length);
this.range.setEnd(state.node, state.offset);
this.content = state.content;
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return length - state.remainder;
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}
setStartOffset(length) {
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const state = TextSourceRange.seekBackward(this.range.startContainer, this.range.startOffset, length);
this.range.setStart(state.node, state.offset);
this.content = state.content;
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return length - state.remainder;
}
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containsPoint(point) {
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const rect = this.getPaddedRect();
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return point.x >= rect.left && point.x <= rect.right;
}
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getRect() {
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return this.range.getBoundingClientRect();
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}
getWritingMode() {
return TextSourceRange.getElementWritingMode(TextSourceRange.getParentElement(this.range.startContainer));
}
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getPaddedRect() {
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const range = this.range.cloneRange();
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const startOffset = range.startOffset;
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const endOffset = range.endOffset;
const node = range.startContainer;
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range.setStart(node, Math.max(0, startOffset - 1));
range.setEnd(node, Math.min(node.length, endOffset + 1));
return range.getBoundingClientRect();
}
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select() {
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const selection = window.getSelection();
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selection.removeAllRanges();
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selection.addRange(this.range);
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}
deselect() {
const selection = window.getSelection();
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selection.removeAllRanges();
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}
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equals(other) {
return other && other.range && other.range.compareBoundaryPoints(Range.START_TO_START, this.range) === 0;
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}
static shouldEnter(node) {
if (node.nodeType !== 1) {
return false;
}
const skip = ['RT', 'SCRIPT', 'STYLE'];
if (skip.includes(node.nodeName)) {
return false;
}
const style = window.getComputedStyle(node);
const hidden =
style.visibility === 'hidden' ||
style.display === 'none' ||
parseFloat(style.fontSize) === 0;
return !hidden;
}
static seekForward(node, offset, length) {
const state = {node, offset, remainder: length, content: ''};
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if (!TextSourceRange.seekForwardHelper(node, state)) {
return state;
}
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for (let current = node; current !== null; current = current.parentElement) {
for (let sibling = current.nextSibling; sibling !== null; sibling = sibling.nextSibling) {
if (!TextSourceRange.seekForwardHelper(sibling, state)) {
return state;
}
}
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}
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return state;
}
static seekForwardHelper(node, state) {
if (node.nodeType === 3 && node.parentElement && TextSourceRange.shouldEnter(node.parentElement)) {
const offset = state.node === node ? state.offset : 0;
let consumed = 0;
let stripped = 0;
while (state.remainder - consumed > 0) {
const currentChar = node.nodeValue[offset + consumed + stripped];
if (!currentChar) {
break;
} else if (currentChar.match(IGNORE_TEXT_PATTERN)) {
stripped++;
} else {
consumed++;
state.content += currentChar;
}
}
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state.node = node;
state.offset = offset + consumed + stripped;
state.remainder -= consumed;
} else if (TextSourceRange.shouldEnter(node)) {
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for (let i = 0; i < node.childNodes.length; ++i) {
if (!TextSourceRange.seekForwardHelper(node.childNodes[i], state)) {
break;
}
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}
}
return state.remainder > 0;
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}
static seekBackward(node, offset, length) {
const state = {node, offset, remainder: length, content: ''};
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if (!TextSourceRange.seekBackwardHelper(node, state)) {
return state;
}
for (let current = node; current !== null; current = current.parentElement) {
for (let sibling = current.previousSibling; sibling !== null; sibling = sibling.previousSibling) {
if (!TextSourceRange.seekBackwardHelper(sibling, state)) {
return state;
}
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}
}
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return state;
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}
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static seekBackwardHelper(node, state) {
if (node.nodeType === 3 && node.parentElement && TextSourceRange.shouldEnter(node.parentElement)) {
const offset = state.node === node ? state.offset : node.length;
let consumed = 0;
let stripped = 0;
while (state.remainder - consumed > 0) {
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const currentChar = node.nodeValue[offset - 1 - consumed - stripped]; // negative indices are undefined in JS
if (!currentChar) {
break;
} else if (currentChar.match(IGNORE_TEXT_PATTERN)) {
stripped++;
} else {
consumed++;
state.content = currentChar + state.content;
}
}
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state.node = node;
state.offset = offset - consumed - stripped;
state.remainder -= consumed;
} else if (TextSourceRange.shouldEnter(node)) {
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for (let i = node.childNodes.length - 1; i >= 0; --i) {
if (!TextSourceRange.seekBackwardHelper(node.childNodes[i], state)) {
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break;
}
}
}
return state.remainder > 0;
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}
static getParentElement(node) {
while (node !== null && node.nodeType !== Node.ELEMENT_NODE) {
node = node.parentNode;
}
return node;
}
static getElementWritingMode(element) {
if (element === null) {
return 'horizontal-tb';
}
const style = window.getComputedStyle(element);
const writingMode = style.writingMode;
return typeof writingMode === 'string' ? writingMode : 'horizontal-tb';
}
static getNodesInRange(range) {
const end = range.endContainer;
const nodes = [];
for (let node = range.startContainer; node !== null; node = TextSourceRange.getNextNode(node)) {
nodes.push(node);
if (node === end) { break; }
}
return nodes;
}
static getNextNode(node) {
let next = node.firstChild;
if (next === null) {
while (true) {
next = node.nextSibling;
if (next !== null) { break; }
next = node.parentNode;
if (node === null) { break; }
node = next;
}
}
return next;
}
static anyNodeMatchesSelector(nodeList, selector) {
for (const node of nodeList) {
if (TextSourceRange.nodeMatchesSelector(node, selector)) {
return true;
}
}
return false;
}
static nodeMatchesSelector(node, selector) {
for (; node !== null; node = node.parentNode) {
if (node.nodeType === Node.ELEMENT_NODE) {
return node.matches(selector);
}
}
return false;
}
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}
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/*
* TextSourceElement
*/
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class TextSourceElement {
constructor(element, content='') {
this.element = element;
this.content = content;
}
clone() {
return new TextSourceElement(this.element, this.content);
}
cleanup() {
// NOP
}
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text() {
return this.content;
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}
setEndOffset(length) {
switch (this.element.nodeName) {
case 'BUTTON':
this.content = this.element.innerHTML;
break;
case 'IMG':
this.content = this.element.getAttribute('alt');
break;
default:
this.content = this.element.value;
break;
}
let consumed = 0;
let content = '';
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for (let currentChar of this.content || '') {
if (consumed >= length) {
break;
} else if (!currentChar.match(IGNORE_TEXT_PATTERN)) {
consumed++;
content += currentChar;
}
}
this.content = content;
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return this.content.length;
}
setStartOffset(length) {
return 0;
}
containsPoint(point) {
const rect = this.getRect();
return point.x >= rect.left && point.x <= rect.right;
}
getRect() {
return this.element.getBoundingClientRect();
}
getWritingMode() {
return 'horizontal-tb';
}
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select() {
// NOP
}
deselect() {
// NOP
}
equals(other) {
return other && other.element === this.element && other.content === this.content;
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}
}