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Diffstat (limited to 'ext/mixed/js/document-util.js')
| -rw-r--r-- | ext/mixed/js/document-util.js | 570 |
1 files changed, 0 insertions, 570 deletions
diff --git a/ext/mixed/js/document-util.js b/ext/mixed/js/document-util.js deleted file mode 100644 index 513a0c05..00000000 --- a/ext/mixed/js/document-util.js +++ /dev/null @@ -1,570 +0,0 @@ -/* - * Copyright (C) 2016-2021 Yomichan Authors - * - * 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 <https://www.gnu.org/licenses/>. - */ - -/* global - * DOMTextScanner - * TextSourceElement - * TextSourceRange - */ - -class DocumentUtil { - constructor() { - this._transparentColorPattern = /rgba\s*\([^)]*,\s*0(?:\.0+)?\s*\)/; - } - - getRangeFromPoint(x, y, deepContentScan) { - const elements = this._getElementsFromPoint(x, y, deepContentScan); - let imposter = null; - let imposterContainer = null; - let imposterSourceElement = null; - if (elements.length > 0) { - const element = elements[0]; - switch (element.nodeName.toUpperCase()) { - case 'IMG': - case 'BUTTON': - return new TextSourceElement(element); - case 'INPUT': - imposterSourceElement = element; - [imposter, imposterContainer] = this._createImposter(element, false); - break; - case 'TEXTAREA': - imposterSourceElement = element; - [imposter, imposterContainer] = this._createImposter(element, true); - break; - } - } - - const range = this._caretRangeFromPointExt(x, y, deepContentScan ? elements : []); - if (range !== null) { - if (imposter !== null) { - this._setImposterStyle(imposterContainer.style, 'z-index', '-2147483646'); - this._setImposterStyle(imposter.style, 'pointer-events', 'none'); - } - return new TextSourceRange(range, '', imposterContainer, imposterSourceElement); - } else { - if (imposterContainer !== null) { - imposterContainer.parentNode.removeChild(imposterContainer); - } - return null; - } - } - - /** - * Extract a sentence from a document. - * @param source The text source object, either `TextSourceRange` or `TextSourceElement`. - * @param layoutAwareScan Whether or not layout-aware scan mode should be used. - * @param extent The length of the sentence to extract. - * @param terminatorMap A mapping of characters that terminate a sentence. - * Format: - * ```js - * new Map([ [character: string, [includeCharacterAtStart: boolean, includeCharacterAtEnd: boolean]], ... ]) - * ``` - * @param forwardQuoteMap A mapping of quote characters that delimit a sentence. - * Format: - * ```js - * new Map([ [character: string, [otherCharacter: string, includeCharacterAtStart: boolean]], ... ]) - * ``` - * @param backwardQuoteMap A mapping of quote characters that delimit a sentence, - * which is the inverse of forwardQuoteMap. - * Format: - * ```js - * new Map([ [character: string, [otherCharacter: string, includeCharacterAtEnd: boolean]], ... ]) - * ``` - * @returns The sentence and the offset to the original source: `{sentence: string, offset: integer}`. - */ - extractSentence(source, layoutAwareScan, extent, terminatorMap, forwardQuoteMap, backwardQuoteMap) { - // Scan text - source = source.clone(); - const startLength = source.setStartOffset(extent, layoutAwareScan); - const endLength = source.setEndOffset(extent * 2 - startLength, layoutAwareScan, true); - const text = source.text(); - const textLength = text.length; - const textEndAnchor = textLength - endLength; - let pos1 = startLength; - let pos2 = textEndAnchor; - - // Move backward - let quoteStack = []; - for (; pos1 > 0; --pos1) { - const c = text[pos1 - 1]; - if (c === '\n') { break; } - - if (quoteStack.length === 0) { - const terminatorInfo = terminatorMap.get(c); - if (typeof terminatorInfo !== 'undefined') { - if (terminatorInfo[0]) { --pos1; } - break; - } - } - - let quoteInfo = forwardQuoteMap.get(c); - if (typeof quoteInfo !== 'undefined') { - if (quoteStack.length === 0) { - if (quoteInfo[1]) { --pos1; } - break; - } else if (quoteStack[0] === c) { - quoteStack.pop(); - continue; - } - } - - quoteInfo = backwardQuoteMap.get(c); - if (typeof quoteInfo !== 'undefined') { - quoteStack.unshift(quoteInfo[0]); - } - } - - // Move forward - quoteStack = []; - for (; pos2 < textLength; ++pos2) { - const c = text[pos2]; - if (c === '\n') { break; } - - if (quoteStack.length === 0) { - const terminatorInfo = terminatorMap.get(c); - if (typeof terminatorInfo !== 'undefined') { - if (terminatorInfo[1]) { ++pos2; } - break; - } - } - - let quoteInfo = backwardQuoteMap.get(c); - if (typeof quoteInfo !== 'undefined') { - if (quoteStack.length === 0) { - if (quoteInfo[1]) { ++pos2; } - break; - } else if (quoteStack[0] === c) { - quoteStack.pop(); - continue; - } - } - - quoteInfo = forwardQuoteMap.get(c); - if (typeof quoteInfo !== 'undefined') { - quoteStack.unshift(quoteInfo[0]); - } - } - - // Trim whitespace - for (; pos1 < startLength && this._isWhitespace(text[pos1]); ++pos1) { /* NOP */ } - for (; pos2 > textEndAnchor && this._isWhitespace(text[pos2 - 1]); --pos2) { /* NOP */ } - - // Result - return { - text: text.substring(pos1, pos2), - offset: startLength - pos1 - }; - } - - static isPointInRect(x, y, rect) { - return ( - x >= rect.left && x < rect.right && - y >= rect.top && y < rect.bottom - ); - } - - static isPointInAnyRect(x, y, rects) { - for (const rect of rects) { - if (this.isPointInRect(x, y, rect)) { - return true; - } - } - return false; - } - - static isPointInSelection(x, y, selection) { - for (let i = 0; i < selection.rangeCount; ++i) { - const range = selection.getRangeAt(i); - if (this.isPointInAnyRect(x, y, range.getClientRects())) { - return true; - } - } - return false; - } - - static isMouseButtonPressed(mouseEvent, button) { - const mouseEventButton = mouseEvent.button; - switch (button) { - case 'primary': return mouseEventButton === 0; - case 'secondary': return mouseEventButton === 2; - case 'auxiliary': return mouseEventButton === 1; - default: return false; - } - } - - static getActiveModifiers(event) { - const modifiers = []; - if (event.altKey) { modifiers.push('alt'); } - if (event.ctrlKey) { modifiers.push('ctrl'); } - if (event.metaKey) { modifiers.push('meta'); } - if (event.shiftKey) { modifiers.push('shift'); } - return modifiers; - } - - static getActiveModifiersAndButtons(event) { - const modifiers = this.getActiveModifiers(event); - this._getActiveButtons(event, modifiers); - return modifiers; - } - - static getActiveButtons(event) { - const buttons = []; - this._getActiveButtons(event, buttons); - return buttons; - } - - static addFullscreenChangeEventListener(onFullscreenChanged, eventListenerCollection=null) { - const target = document; - const options = false; - const fullscreenEventNames = [ - 'fullscreenchange', - 'MSFullscreenChange', - 'mozfullscreenchange', - 'webkitfullscreenchange' - ]; - for (const eventName of fullscreenEventNames) { - if (eventListenerCollection === null) { - target.addEventListener(eventName, onFullscreenChanged, options); - } else { - eventListenerCollection.addEventListener(target, eventName, onFullscreenChanged, options); - } - } - } - - static getFullscreenElement() { - return ( - document.fullscreenElement || - document.msFullscreenElement || - document.mozFullScreenElement || - document.webkitFullscreenElement || - null - ); - } - - static getNodesInRange(range) { - const end = range.endContainer; - const nodes = []; - for (let node = range.startContainer; node !== null; node = this.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 (next === null) { break; } - - node = next; - } - } - return next; - } - - static anyNodeMatchesSelector(nodes, selector) { - const ELEMENT_NODE = Node.ELEMENT_NODE; - for (let node of nodes) { - for (; node !== null; node = node.parentNode) { - if (node.nodeType !== ELEMENT_NODE) { continue; } - if (node.matches(selector)) { return true; } - break; - } - } - return false; - } - - static everyNodeMatchesSelector(nodes, selector) { - const ELEMENT_NODE = Node.ELEMENT_NODE; - for (let node of nodes) { - while (true) { - if (node === null) { return false; } - if (node.nodeType === ELEMENT_NODE && node.matches(selector)) { break; } - node = node.parentNode; - } - } - return true; - } - - static isMetaKeySupported(os, browser) { - return !(browser === 'firefox' || browser === 'firefox-mobile') || os === 'mac'; - } - - static _getActiveButtons(event, array) { - let {buttons} = event; - if (typeof buttons === 'number' && buttons > 0) { - for (let i = 0; i < 6; ++i) { - const buttonFlag = (1 << i); - if ((buttons & buttonFlag) !== 0) { - array.push(`mouse${i}`); - buttons &= ~buttonFlag; - if (buttons === 0) { break; } - } - } - } - } - - // Private - - _setImposterStyle(style, propertyName, value) { - style.setProperty(propertyName, value, 'important'); - } - - _createImposter(element, isTextarea) { - const body = document.body; - if (body === null) { return [null, null]; } - - const elementStyle = window.getComputedStyle(element); - const elementRect = element.getBoundingClientRect(); - const documentRect = document.documentElement.getBoundingClientRect(); - let left = elementRect.left - documentRect.left; - let top = elementRect.top - documentRect.top; - - // Container - const container = document.createElement('div'); - const containerStyle = container.style; - this._setImposterStyle(containerStyle, 'all', 'initial'); - this._setImposterStyle(containerStyle, 'position', 'absolute'); - this._setImposterStyle(containerStyle, 'left', '0'); - this._setImposterStyle(containerStyle, 'top', '0'); - this._setImposterStyle(containerStyle, 'width', `${documentRect.width}px`); - this._setImposterStyle(containerStyle, 'height', `${documentRect.height}px`); - this._setImposterStyle(containerStyle, 'overflow', 'hidden'); - this._setImposterStyle(containerStyle, 'opacity', '0'); - this._setImposterStyle(containerStyle, 'pointer-events', 'none'); - this._setImposterStyle(containerStyle, 'z-index', '2147483646'); - - // Imposter - const imposter = document.createElement('div'); - const imposterStyle = imposter.style; - - let value = element.value; - if (value.endsWith('\n')) { value += '\n'; } - imposter.textContent = value; - - for (let i = 0, ii = elementStyle.length; i < ii; ++i) { - const property = elementStyle[i]; - this._setImposterStyle(imposterStyle, property, elementStyle.getPropertyValue(property)); - } - this._setImposterStyle(imposterStyle, 'position', 'absolute'); - this._setImposterStyle(imposterStyle, 'top', `${top}px`); - this._setImposterStyle(imposterStyle, 'left', `${left}px`); - this._setImposterStyle(imposterStyle, 'margin', '0'); - this._setImposterStyle(imposterStyle, 'pointer-events', 'auto'); - - if (isTextarea) { - if (elementStyle.overflow === 'visible') { - this._setImposterStyle(imposterStyle, 'overflow', 'auto'); - } - } else { - this._setImposterStyle(imposterStyle, 'overflow', 'hidden'); - this._setImposterStyle(imposterStyle, 'white-space', 'nowrap'); - this._setImposterStyle(imposterStyle, 'line-height', elementStyle.height); - } - - container.appendChild(imposter); - body.appendChild(container); - - // Adjust size - const imposterRect = imposter.getBoundingClientRect(); - if (imposterRect.width !== elementRect.width || imposterRect.height !== elementRect.height) { - const width = parseFloat(elementStyle.width) + (elementRect.width - imposterRect.width); - const height = parseFloat(elementStyle.height) + (elementRect.height - imposterRect.height); - this._setImposterStyle(imposterStyle, 'width', `${width}px`); - this._setImposterStyle(imposterStyle, 'height', `${height}px`); - } - if (imposterRect.x !== elementRect.x || imposterRect.y !== elementRect.y) { - left += (elementRect.left - imposterRect.left); - top += (elementRect.top - imposterRect.top); - this._setImposterStyle(imposterStyle, 'left', `${left}px`); - this._setImposterStyle(imposterStyle, 'top', `${top}px`); - } - - imposter.scrollTop = element.scrollTop; - imposter.scrollLeft = element.scrollLeft; - - return [imposter, container]; - } - - _getElementsFromPoint(x, y, all) { - if (all) { - // document.elementsFromPoint can return duplicates which must be removed. - const elements = document.elementsFromPoint(x, y); - return elements.filter((e, i) => elements.indexOf(e) === i); - } - - const e = document.elementFromPoint(x, y); - return e !== null ? [e] : []; - } - - _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} = new DOMTextScanner(range.endContainer, range.endOffset, true, false).seek(1); - range.setEnd(node, offset); - - if (!this._isWhitespace(content) && DocumentUtil.isPointInAnyRect(x, y, range.getClientRects())) { - return true; - } - } finally { - range.setEnd(nodePre, offsetPre); - } - - // Scan backward - const {node, offset, content} = new DOMTextScanner(range.startContainer, range.startOffset, true, false).seek(-1); - range.setStart(node, offset); - - if (!this._isWhitespace(content) && DocumentUtil.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; - } - - _isWhitespace(string) { - return string.trim().length === 0; - } - - _caretRangeFromPoint(x, y) { - if (typeof document.caretRangeFromPoint === 'function') { - // Chrome, Edge - return document.caretRangeFromPoint(x, y); - } - - if (typeof document.caretPositionFromPoint === 'function') { - // Firefox - return this._caretPositionFromPoint(x, y); - } - - // No support - return null; - } - - _caretPositionFromPoint(x, y) { - const position = document.caretPositionFromPoint(x, y); - if (position === null) { - return null; - } - const node = position.offsetNode; - if (node === null) { - return null; - } - - const range = document.createRange(); - const offset = (node.nodeType === Node.TEXT_NODE ? position.offset : 0); - try { - range.setStart(node, offset); - range.setEnd(node, offset); - } catch (e) { - // Firefox throws new DOMException("The operation is insecure.") - // when trying to select a node from within a ShadowRoot. - return null; - } - return range; - } - - _caretRangeFromPointExt(x, y, elements) { - const modifications = []; - try { - let i = 0; - let startContinerPre = null; - while (true) { - const range = this._caretRangeFromPoint(x, y); - if (range === null) { - return null; - } - - const startContainer = range.startContainer; - if (startContinerPre !== startContainer) { - if (this._isPointInRange(x, y, range)) { - return range; - } - startContinerPre = startContainer; - } - - i = this._disableTransparentElement(elements, i, modifications); - if (i < 0) { - return null; - } - } - } finally { - if (modifications.length > 0) { - this._restoreElementStyleModifications(modifications); - } - } - } - - _disableTransparentElement(elements, i, modifications) { - while (true) { - if (i >= elements.length) { - return -1; - } - - const element = elements[i++]; - if (this._isElementTransparent(element)) { - const style = element.hasAttribute('style') ? element.getAttribute('style') : null; - modifications.push({element, style}); - 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); - } -} |