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Diffstat (limited to 'ext/js/display/structured-content-generator.js')
| -rw-r--r-- | ext/js/display/structured-content-generator.js | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/ext/js/display/structured-content-generator.js b/ext/js/display/structured-content-generator.js new file mode 100644 index 00000000..cd4ea091 --- /dev/null +++ b/ext/js/display/structured-content-generator.js @@ -0,0 +1,213 @@ +/* + * 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(templates, mediaLoader, document) { + this._templates = templates; + 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 aspectRatio = ( + hasPreferredWidth && hasPreferredHeight ? + preferredWidth / preferredHeight : + width / height + ); + const usedWidth = ( + hasPreferredWidth ? + preferredWidth : + (hasPreferredHeight ? preferredHeight * aspectRatio : width) + ); + + const node = this._templates.instantiate('gloss-item-image'); + const imageContainer = node.querySelector('.gloss-image-container'); + const aspectRatioSizer = node.querySelector('.gloss-image-aspect-ratio-sizer'); + const image = node.querySelector('.gloss-image'); + const imageBackground = node.querySelector('.gloss-image-background'); + + 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 = `${aspectRatio * 100.0}%`; + + if (this._mediaLoader !== null) { + this._mediaLoader.loadMedia( + path, + dictionary, + (url) => this._setImageData(node, image, imageBackground, url, false), + () => this._setImageData(node, image, imageBackground, null, true) + ); + } + + return node; + } + + // Private + + _createElement(tagName) { + return this._document.createElement(tagName); + } + + _createTextNode(data) { + return this._document.createTextNode(data); + } + + _createDocumentFragment() { + return this._document.createDocumentFragment(); + } + + _setImageData(node, image, imageBackground, url, unloaded) { + if (url !== null) { + image.src = url; + node.href = url; + node.dataset.imageLoadState = 'loaded'; + imageBackground.style.setProperty('--image', `url("${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'); + container.classList = '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); + node.className = `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(' '); + } + } +} |