/* * Copyright (C) 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/>. */ class StructuredContentGenerator { constructor(mediaLoader, document) { this._mediaLoader = mediaLoader; this._document = document; } createStructuredContent(content, dictionary) { if (typeof content === 'string') { return this._createTextNode(content); } if (!(typeof content === 'object' && content !== null)) { return null; } if (Array.isArray(content)) { const fragment = this._createDocumentFragment(); for (const item of content) { const child = this.createStructuredContent(item, dictionary); if (child !== null) { fragment.appendChild(child); } } return fragment; } const {tag} = content; switch (tag) { case 'br': return this._createStructuredContentElement(tag, content, dictionary, 'simple', false, false); case 'ruby': case 'rt': case 'rp': return this._createStructuredContentElement(tag, content, dictionary, 'simple', true, false); case 'table': return this._createStructuredContentTableElement(tag, content, dictionary); case 'thead': case 'tbody': case 'tfoot': case 'tr': return this._createStructuredContentElement(tag, content, dictionary, 'table', true, false); case 'th': case 'td': return this._createStructuredContentElement(tag, content, dictionary, 'table-cell', true, true); case 'div': case 'span': return this._createStructuredContentElement(tag, content, dictionary, 'simple', true, true); case 'img': return this.createDefinitionImage(content, dictionary); } return null; } createDefinitionImage(data, dictionary) { const { path, width, height, preferredWidth, preferredHeight, title, pixelated, imageRendering, appearance, background, collapsed, collapsible, verticalAlign, sizeUnits } = data; const hasPreferredWidth = (typeof preferredWidth === 'number'); const hasPreferredHeight = (typeof preferredHeight === 'number'); const invAspectRatio = ( hasPreferredWidth && hasPreferredHeight ? preferredHeight / preferredWidth : height / width ); const usedWidth = ( hasPreferredWidth ? preferredWidth : (hasPreferredHeight ? preferredHeight * invAspectRatio : width) ); const node = this._createElement('a', 'gloss-image-link'); node.target = '_blank'; node.rel = 'noreferrer noopener'; const imageContainer = this._createElement('span', 'gloss-image-container'); node.appendChild(imageContainer); const aspectRatioSizer = this._createElement('span', 'gloss-image-sizer'); imageContainer.appendChild(aspectRatioSizer); const imageBackground = this._createElement('span', 'gloss-image-background'); imageContainer.appendChild(imageBackground); const image = this._createElement('img', 'gloss-image'); image.alt = ''; imageContainer.appendChild(image); const overlay = this._createElement('span', 'gloss-image-container-overlay'); imageContainer.appendChild(overlay); const linkText = this._createElement('span', 'gloss-image-link-text'); linkText.textContent = 'Image'; node.appendChild(linkText); node.dataset.path = path; node.dataset.dictionary = dictionary; node.dataset.imageLoadState = 'not-loaded'; node.dataset.hasAspectRatio = 'true'; node.dataset.imageRendering = typeof imageRendering === 'string' ? imageRendering : (pixelated ? 'pixelated' : 'auto'); node.dataset.appearance = typeof appearance === 'string' ? appearance : 'auto'; node.dataset.background = typeof background === 'boolean' ? `${background}` : 'true'; node.dataset.collapsed = typeof collapsed === 'boolean' ? `${collapsed}` : 'false'; node.dataset.collapsible = typeof collapsible === 'boolean' ? `${collapsible}` : 'true'; if (typeof verticalAlign === 'string') { node.dataset.verticalAlign = verticalAlign; } if (typeof sizeUnits === 'string' && (hasPreferredWidth || hasPreferredHeight)) { node.dataset.sizeUnits = sizeUnits; } imageContainer.style.width = `${usedWidth}em`; if (typeof title === 'string') { imageContainer.title = title; } aspectRatioSizer.style.paddingTop = `${invAspectRatio * 100.0}%`; if (this._mediaLoader !== null) { this._mediaLoader.loadMedia( path, dictionary, (url) => this._setImageData(node, image, imageBackground, url, false), () => this._setImageData(node, image, imageBackground, null, true) ); } return node; } // Private _createElement(tagName, className) { const node = this._document.createElement(tagName); node.className = className; return node; } _createTextNode(data) { return this._document.createTextNode(data); } _createDocumentFragment() { return this._document.createDocumentFragment(); } _setImageData(node, image, imageBackground, url, unloaded) { if (url !== null) { image.src = url; node.href = url; node.dataset.imageLoadState = 'loaded'; imageBackground.style.setProperty('--image', `url("${url}")`); } else { image.removeAttribute('src'); node.removeAttribute('href'); node.dataset.imageLoadState = unloaded ? 'unloaded' : 'load-error'; imageBackground.style.removeProperty('--image'); } } _createStructuredContentTableElement(tag, content, dictionary) { const container = this._createElement('div', 'gloss-sc-table-container'); const table = this._createStructuredContentElement(tag, content, dictionary, 'table', true, false); container.appendChild(table); return container; } _createStructuredContentElement(tag, content, dictionary, type, hasChildren, hasStyle) { const node = this._createElement(tag, `gloss-sc-${tag}`); switch (type) { case 'table-cell': { const {colSpan, rowSpan} = content; if (typeof colSpan === 'number') { node.colSpan = colSpan; } if (typeof rowSpan === 'number') { node.rowSpan = rowSpan; } } break; } if (hasStyle) { const {style} = content; if (typeof style === 'object' && style !== null) { this._setStructuredContentElementStyle(node, style); } } if (hasChildren) { const child = this.createStructuredContent(content.content, dictionary); if (child !== null) { node.appendChild(child); } } return node; } _setStructuredContentElementStyle(node, contentStyle) { const {style} = node; const {fontStyle, fontWeight, fontSize, textDecorationLine, verticalAlign} = contentStyle; if (typeof fontStyle === 'string') { style.fontStyle = fontStyle; } if (typeof fontWeight === 'string') { style.fontWeight = fontWeight; } if (typeof fontSize === 'string') { style.fontSize = fontSize; } if (typeof verticalAlign === 'string') { style.verticalAlign = verticalAlign; } if (typeof textDecorationLine === 'string') { style.textDecoration = textDecorationLine; } else if (Array.isArray(textDecorationLine)) { style.textDecoration = textDecorationLine.join(' '); } } }