81 lines
2.3 KiB
JavaScript
81 lines
2.3 KiB
JavaScript
import visit from 'unist-util-visit'
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import h from 'hastscript'
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import { removeClass, addClass, hasClass } from './rehype-util-class'
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const RE_SPACE = /[\w\r\n]*/
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export default function attacher () {
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return tree => {
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visit(tree, 'element', (node, index, { children }) => {
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let { tagName, properties, properties: { src, alt, title, className } } = node
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if (tagName !== 'img' || src.match(/^\w+:\/\//)) {
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return
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}
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src = src.replace(/(\.\.)?\/assets\//g, '/images/content/')
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if (hasClass(node, 'preview')) {
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removeClass(node, 'preview')
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let fig = h(`figure${hasClass(node, 'hero') ? '.hero' : ''}`, [
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h('div.preview', [
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h('img', {
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src,
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alt,
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title,
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className,
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srcset: `${src} 2x`
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})
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]),
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...(title || alt) ? [
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h('figcaption', [
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...title ? [
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h('p.caption', title)
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] : [],
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...alt ? [
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h('p.desc', alt)
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] : []
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])
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] : []
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])
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children.splice(index, 1, fig)
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if (hasClass(node, 'bad')) {
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removeClass(node, 'bad')
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addClass(fig, 'bad')
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let prev
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let prevIndex = index - 1
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while (true) {
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prev = children[prevIndex]
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if (!prev) {
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break
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}
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// skip whitespace-only text nodes
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if (prev.type === 'text' && RE_SPACE.test(prev.value)) {
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prevIndex--
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continue
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}
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break
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}
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if (prev) {
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let prevPreview = (prev.children || [])[0]
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if (prevPreview && hasClass(prevPreview, 'preview')) {
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let prevImg = (prevPreview.children || [])[0]
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if (hasClass(prevImg, 'good')) {
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removeClass(prevImg, 'good')
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addClass(prev, 'good')
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children.splice(index - 1, 2, h('div.comparison', [prev, fig]))
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}
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}
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}
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}
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} else {
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properties.src = src
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properties.srcset = `${src} 2x`
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if (className && !className.length) {
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delete properties.className
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}
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}
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})
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}
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}
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