575 lines
19 KiB
JavaScript
575 lines
19 KiB
JavaScript
/*
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* Copyright (C) 2016-2021 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/* global
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* DOMTextScanner
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* TextSourceElement
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* TextSourceRange
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*/
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class DocumentUtil {
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constructor() {
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this._transparentColorPattern = /rgba\s*\([^)]*,\s*0(?:\.0+)?\s*\)/;
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}
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getRangeFromPoint(x, y, deepContentScan) {
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const elements = this._getElementsFromPoint(x, y, deepContentScan);
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let imposter = null;
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let imposterContainer = null;
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let imposterSourceElement = null;
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if (elements.length > 0) {
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const element = elements[0];
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switch (element.nodeName.toUpperCase()) {
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case 'IMG':
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case 'BUTTON':
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return new TextSourceElement(element);
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case 'INPUT':
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imposterSourceElement = element;
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[imposter, imposterContainer] = this._createImposter(element, false);
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break;
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case 'TEXTAREA':
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imposterSourceElement = element;
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[imposter, imposterContainer] = this._createImposter(element, true);
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break;
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}
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}
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const range = this._caretRangeFromPointExt(x, y, deepContentScan ? elements : []);
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if (range !== null) {
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if (imposter !== null) {
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this._setImposterStyle(imposterContainer.style, 'z-index', '-2147483646');
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this._setImposterStyle(imposter.style, 'pointer-events', 'none');
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}
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return new TextSourceRange(range, '', imposterContainer, imposterSourceElement);
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} else {
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if (imposterContainer !== null) {
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imposterContainer.parentNode.removeChild(imposterContainer);
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}
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return null;
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}
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}
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extractSentence(source, extent, layoutAwareScan) {
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const quotesFwd = {'「': '」', '『': '』', "'": "'", '"': '"'};
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const quotesBwd = {'」': '「', '』': '『', "'": "'", '"': '"'};
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const terminators = '…。．.？?！!';
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const sourceLocal = source.clone();
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const position = sourceLocal.setStartOffset(extent, layoutAwareScan);
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sourceLocal.setEndOffset(extent * 2 - position, layoutAwareScan, true);
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const content = sourceLocal.text();
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let quoteStack = [];
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let startPos = 0;
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for (let i = position; i >= startPos; --i) {
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const c = content[i];
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if (c === '\n') {
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startPos = i + 1;
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break;
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}
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if (quoteStack.length === 0 && (terminators.includes(c) || c in quotesFwd)) {
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startPos = i + 1;
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break;
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}
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if (quoteStack.length > 0 && c === quoteStack[0]) {
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quoteStack.pop();
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} else if (c in quotesBwd) {
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quoteStack.unshift(quotesBwd[c]);
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}
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}
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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') {
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endPos = i + 1;
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break;
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}
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if (quoteStack.length === 0) {
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if (terminators.includes(c)) {
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endPos = i + 1;
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break;
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} else if (c in quotesBwd) {
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endPos = i;
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break;
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}
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}
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if (quoteStack.length > 0 && c === quoteStack[0]) {
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quoteStack.pop();
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} else if (c in quotesFwd) {
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quoteStack.unshift(quotesFwd[c]);
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}
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}
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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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}
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static isPointInRect(x, y, rect) {
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return (
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x >= rect.left && x < rect.right &&
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y >= rect.top && y < rect.bottom
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);
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}
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static isPointInAnyRect(x, y, rects) {
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for (const rect of rects) {
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if (this.isPointInRect(x, y, rect)) {
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return true;
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}
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}
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return false;
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}
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static isPointInSelection(x, y, selection) {
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for (let i = 0; i < selection.rangeCount; ++i) {
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const range = selection.getRangeAt(i);
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if (this.isPointInAnyRect(x, y, range.getClientRects())) {
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return true;
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}
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}
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return false;
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}
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static isMouseButtonPressed(mouseEvent, button) {
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const mouseEventButton = mouseEvent.button;
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switch (button) {
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case 'primary': return mouseEventButton === 0;
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case 'secondary': return mouseEventButton === 2;
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case 'auxiliary': return mouseEventButton === 1;
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default: return false;
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}
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}
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static getActiveModifiers(event) {
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const modifiers = [];
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if (event.altKey) { modifiers.push('alt'); }
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if (event.ctrlKey) { modifiers.push('ctrl'); }
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if (event.metaKey) { modifiers.push('meta'); }
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if (event.shiftKey) { modifiers.push('shift'); }
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return modifiers;
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}
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static getActiveModifiersAndButtons(event) {
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const modifiers = this.getActiveModifiers(event);
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this._getActiveButtons(event, modifiers);
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return modifiers;
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}
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static getActiveButtons(event) {
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const buttons = [];
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this._getActiveButtons(event, buttons);
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return buttons;
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}
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static getKeyFromEvent(event) {
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const key = event.key;
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return (typeof key === 'string' ? (key.length === 1 ? key.toUpperCase() : key) : '');
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}
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static addFullscreenChangeEventListener(onFullscreenChanged, eventListenerCollection=null) {
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const target = document;
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const options = false;
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const fullscreenEventNames = [
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'fullscreenchange',
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'MSFullscreenChange',
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'mozfullscreenchange',
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'webkitfullscreenchange'
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];
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for (const eventName of fullscreenEventNames) {
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if (eventListenerCollection === null) {
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target.addEventListener(eventName, onFullscreenChanged, options);
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} else {
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eventListenerCollection.addEventListener(target, eventName, onFullscreenChanged, options);
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}
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}
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}
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static getFullscreenElement() {
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return (
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document.fullscreenElement ||
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document.msFullscreenElement ||
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document.mozFullScreenElement ||
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document.webkitFullscreenElement ||
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null
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);
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}
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static getNodesInRange(range) {
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const end = range.endContainer;
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const nodes = [];
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for (let node = range.startContainer; node !== null; node = this.getNextNode(node)) {
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nodes.push(node);
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if (node === end) { break; }
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}
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return nodes;
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}
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static getNextNode(node) {
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let next = node.firstChild;
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if (next === null) {
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while (true) {
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next = node.nextSibling;
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if (next !== null) { break; }
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next = node.parentNode;
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if (next === null) { break; }
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node = next;
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}
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}
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return next;
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}
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static anyNodeMatchesSelector(nodes, selector) {
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const ELEMENT_NODE = Node.ELEMENT_NODE;
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for (let node of nodes) {
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for (; node !== null; node = node.parentNode) {
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if (node.nodeType !== ELEMENT_NODE) { continue; }
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if (node.matches(selector)) { return true; }
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break;
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}
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}
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return false;
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}
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static everyNodeMatchesSelector(nodes, selector) {
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const ELEMENT_NODE = Node.ELEMENT_NODE;
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for (let node of nodes) {
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while (true) {
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if (node === null) { return false; }
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if (node.nodeType === ELEMENT_NODE && node.matches(selector)) { break; }
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node = node.parentNode;
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}
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}
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return true;
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}
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static getModifierKeys(os) {
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switch (os) {
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case 'win':
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return [
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['alt', 'Alt'],
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['ctrl', 'Ctrl'],
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['shift', 'Shift'],
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['meta', 'Windows']
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];
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case 'mac':
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return [
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['alt', 'Opt'],
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['ctrl', 'Ctrl'],
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['shift', 'Shift'],
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['meta', 'Cmd']
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];
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case 'linux':
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case 'openbsd':
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case 'cros':
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case 'android':
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return [
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['alt', 'Alt'],
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['ctrl', 'Ctrl'],
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['shift', 'Shift'],
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['meta', 'Super']
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];
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default: // 'unknown', etc
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return [
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['alt', 'Alt'],
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['ctrl', 'Ctrl'],
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['shift', 'Shift'],
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['meta', 'Meta']
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];
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}
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}
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static isMetaKeySupported(os, browser) {
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return !(browser === 'firefox' || browser === 'firefox-mobile') || os === 'mac';
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}
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static _getActiveButtons(event, array) {
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let {buttons} = event;
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if (typeof buttons === 'number' && buttons > 0) {
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for (let i = 0; i < 6; ++i) {
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const buttonFlag = (1 << i);
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if ((buttons & buttonFlag) !== 0) {
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array.push(`mouse${i}`);
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buttons &= ~buttonFlag;
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if (buttons === 0) { break; }
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}
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}
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}
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}
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// Private
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_setImposterStyle(style, propertyName, value) {
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style.setProperty(propertyName, value, 'important');
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}
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_createImposter(element, isTextarea) {
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const body = document.body;
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if (body === null) { return [null, null]; }
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const elementStyle = window.getComputedStyle(element);
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const elementRect = element.getBoundingClientRect();
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const documentRect = document.documentElement.getBoundingClientRect();
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let left = elementRect.left - documentRect.left;
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let top = elementRect.top - documentRect.top;
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// Container
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const container = document.createElement('div');
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const containerStyle = container.style;
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this._setImposterStyle(containerStyle, 'all', 'initial');
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this._setImposterStyle(containerStyle, 'position', 'absolute');
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this._setImposterStyle(containerStyle, 'left', '0');
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this._setImposterStyle(containerStyle, 'top', '0');
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this._setImposterStyle(containerStyle, 'width', `${documentRect.width}px`);
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this._setImposterStyle(containerStyle, 'height', `${documentRect.height}px`);
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this._setImposterStyle(containerStyle, 'overflow', 'hidden');
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this._setImposterStyle(containerStyle, 'opacity', '0');
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this._setImposterStyle(containerStyle, 'pointer-events', 'none');
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this._setImposterStyle(containerStyle, 'z-index', '2147483646');
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// Imposter
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const imposter = document.createElement('div');
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const imposterStyle = imposter.style;
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let value = element.value;
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if (value.endsWith('\n')) { value += '\n'; }
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imposter.textContent = value;
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for (let i = 0, ii = elementStyle.length; i < ii; ++i) {
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const property = elementStyle[i];
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this._setImposterStyle(imposterStyle, property, elementStyle.getPropertyValue(property));
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}
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this._setImposterStyle(imposterStyle, 'position', 'absolute');
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this._setImposterStyle(imposterStyle, 'top', `${top}px`);
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this._setImposterStyle(imposterStyle, 'left', `${left}px`);
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this._setImposterStyle(imposterStyle, 'margin', '0');
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this._setImposterStyle(imposterStyle, 'pointer-events', 'auto');
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if (isTextarea) {
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if (elementStyle.overflow === 'visible') {
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this._setImposterStyle(imposterStyle, 'overflow', 'auto');
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}
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} else {
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this._setImposterStyle(imposterStyle, 'overflow', 'hidden');
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this._setImposterStyle(imposterStyle, 'white-space', 'nowrap');
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this._setImposterStyle(imposterStyle, 'line-height', elementStyle.height);
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}
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container.appendChild(imposter);
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body.appendChild(container);
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// Adjust size
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const imposterRect = imposter.getBoundingClientRect();
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if (imposterRect.width !== elementRect.width || imposterRect.height !== elementRect.height) {
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const width = parseFloat(elementStyle.width) + (elementRect.width - imposterRect.width);
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const height = parseFloat(elementStyle.height) + (elementRect.height - imposterRect.height);
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this._setImposterStyle(imposterStyle, 'width', `${width}px`);
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this._setImposterStyle(imposterStyle, 'height', `${height}px`);
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}
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if (imposterRect.x !== elementRect.x || imposterRect.y !== elementRect.y) {
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left += (elementRect.left - imposterRect.left);
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top += (elementRect.top - imposterRect.top);
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this._setImposterStyle(imposterStyle, 'left', `${left}px`);
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this._setImposterStyle(imposterStyle, 'top', `${top}px`);
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}
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imposter.scrollTop = element.scrollTop;
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imposter.scrollLeft = element.scrollLeft;
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return [imposter, container];
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}
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_getElementsFromPoint(x, y, all) {
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if (all) {
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// document.elementsFromPoint can return duplicates which must be removed.
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const elements = document.elementsFromPoint(x, y);
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return elements.filter((e, i) => elements.indexOf(e) === i);
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}
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const e = document.elementFromPoint(x, y);
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return e !== null ? [e] : [];
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}
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_isPointInRange(x, y, range) {
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// Require a text node to start
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if (range.startContainer.nodeType !== Node.TEXT_NODE) {
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return false;
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}
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// Scan forward
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const nodePre = range.endContainer;
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const offsetPre = range.endOffset;
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try {
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const {node, offset, content} = new DOMTextScanner(range.endContainer, range.endOffset, true, false).seek(1);
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range.setEnd(node, offset);
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if (!this._isWhitespace(content) && DocumentUtil.isPointInAnyRect(x, y, range.getClientRects())) {
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return true;
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}
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} finally {
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range.setEnd(nodePre, offsetPre);
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}
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// Scan backward
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const {node, offset, content} = new DOMTextScanner(range.startContainer, range.startOffset, true, false).seek(-1);
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range.setStart(node, offset);
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if (!this._isWhitespace(content) && DocumentUtil.isPointInAnyRect(x, y, range.getClientRects())) {
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// This purposefully leaves the starting offset as modified and sets the range length to 0.
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range.setEnd(node, offset);
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return true;
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}
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// No match
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return false;
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}
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_isWhitespace(string) {
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return string.trim().length === 0;
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}
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_caretRangeFromPoint(x, y) {
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if (typeof document.caretRangeFromPoint === 'function') {
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// Chrome, Edge
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return document.caretRangeFromPoint(x, y);
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}
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if (typeof document.caretPositionFromPoint === 'function') {
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// Firefox
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return this._caretPositionFromPoint(x, y);
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}
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// No support
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return null;
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}
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_caretPositionFromPoint(x, y) {
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const position = document.caretPositionFromPoint(x, y);
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if (position === null) {
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return null;
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}
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const node = position.offsetNode;
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if (node === null) {
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return null;
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}
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const range = document.createRange();
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const offset = (node.nodeType === Node.TEXT_NODE ? position.offset : 0);
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try {
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range.setStart(node, offset);
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range.setEnd(node, offset);
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} catch (e) {
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// Firefox throws new DOMException("The operation is insecure.")
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// when trying to select a node from within a ShadowRoot.
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return null;
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}
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return range;
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}
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_caretRangeFromPointExt(x, y, elements) {
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const modifications = [];
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try {
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let i = 0;
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let startContinerPre = null;
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while (true) {
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const range = this._caretRangeFromPoint(x, y);
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if (range === null) {
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return null;
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}
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const startContainer = range.startContainer;
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if (startContinerPre !== startContainer) {
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if (this._isPointInRange(x, y, range)) {
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return range;
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}
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startContinerPre = startContainer;
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}
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i = this._disableTransparentElement(elements, i, modifications);
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if (i < 0) {
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return null;
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}
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}
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} finally {
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if (modifications.length > 0) {
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this._restoreElementStyleModifications(modifications);
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}
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}
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}
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_disableTransparentElement(elements, i, modifications) {
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while (true) {
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if (i >= elements.length) {
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return -1;
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}
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const element = elements[i++];
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if (this._isElementTransparent(element)) {
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const style = element.hasAttribute('style') ? element.getAttribute('style') : null;
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modifications.push({element, style});
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element.style.setProperty('pointer-events', 'none', 'important');
|
||
return i;
|
||
}
|
||
}
|
||
}
|
||
|
||
_restoreElementStyleModifications(modifications) {
|
||
for (const {element, style} of modifications) {
|
||
if (style === null) {
|
||
element.removeAttribute('style');
|
||
} else {
|
||
element.setAttribute('style', style);
|
||
}
|
||
}
|
||
}
|
||
|
||
_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' && this._isColorTransparent(style.backgroundColor))
|
||
);
|
||
}
|
||
|
||
_isColorTransparent(cssColor) {
|
||
return this._transparentColorPattern.test(cssColor);
|
||
}
|
||
}
|