stacker.news/components/text.js

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import styles from './text.module.css'
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import ReactMarkdown from 'react-markdown'
import gfm from 'remark-gfm'
import { Prism as SyntaxHighlighter } from 'react-syntax-highlighter'
import { atomDark } from 'react-syntax-highlighter/dist/cjs/styles/prism'
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import mention from '../lib/remark-mention'
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import sub from '../lib/remark-sub'
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import remarkDirective from 'remark-directive'
import { visit } from 'unist-util-visit'
import reactStringReplace from 'react-string-replace'
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import React, { useEffect, useState } from 'react'
import GithubSlugger from 'github-slugger'
import Link from '../svgs/link.svg'
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import {toString} from 'mdast-util-to-string'
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function myRemarkPlugin () {
return (tree) => {
visit(tree, (node) => {
if (
node.type === 'textDirective' ||
node.type === 'leafDirective'
) {
if (node.name !== 'high') return
const data = node.data || (node.data = {})
data.hName = 'mark'
data.hProperties = {}
}
})
}
}
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function Heading ({ h, slugger, noFragments, topLevel, children, node, ...props }) {
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const id = noFragments ? undefined : slugger.slug(toString(node).replace(/[^\w\-\s]+/gi, ''))
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return (
<div className={styles.heading}>
{React.createElement(h, { id, ...props }, children)}
{!noFragments && topLevel && <a className={styles.headingLink} href={`#${id}`}><Link width={18} height={18} className='fill-grey' /></a>}
</div>
)
}
export default function Text ({ topLevel, noFragments, nofollow, children }) {
// all the reactStringReplace calls are to facilitate search highlighting
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const slugger = new GithubSlugger()
const HeadingWrapper = (props) => Heading({ topLevel, slugger, noFragments, ...props})
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return (
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<div className={styles.text}>
<ReactMarkdown
components={{
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h1: (props) => HeadingWrapper({ h: topLevel ? 'h1' : 'h3', ...props }),
h2: (props) => HeadingWrapper({ h: topLevel ? 'h2' : 'h4', ...props }),
h3: (props) => HeadingWrapper({ h: topLevel ? 'h3' : 'h5', ...props }),
h4: (props) => HeadingWrapper({ h: topLevel ? 'h4' : 'h6', ...props }),
h5: (props) => HeadingWrapper({ h: topLevel ? 'h5' : 'h6', ...props }),
h6: (props) => HeadingWrapper({ h: 'h6', ...props }),
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table: ({ node, ...props }) =>
<div className='table-responsive'>
<table className='table table-bordered table-sm' {...props} />
</div>,
code ({ node, inline, className, children, ...props }) {
const match = /language-(\w+)/.exec(className || '')
return !inline
? (
<SyntaxHighlighter showLineNumbers style={atomDark} language={match && match[1]} PreTag='div' {...props}>
{reactStringReplace(String(children).replace(/\n$/, ''), /:high\[([^\]]+)\]/g, (match, i) => {
return match
}).join('')}
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</SyntaxHighlighter>
)
: (
<code className={className} style={atomDark} {...props}>
{reactStringReplace(String(children), /:high\[([^\]]+)\]/g, (match, i) => {
return <mark key={`mark-${match}`}>{match}</mark>
})}
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</code>
)
},
a: ({ node, href, children, ...props }) => {
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if (children?.some(e => e?.props?.node?.tagName === 'img')) {
return <>{children}</>
}
// map: fix any highlighted links
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children = children?.map(e =>
typeof e === 'string'
? reactStringReplace(e, /:high\[([^\]]+)\]/g, (match, i) => {
return <mark key={`mark-${match}-${i}`}>{match}</mark>
})
: e)
return (
/* eslint-disable-next-line */
<a
target='_blank' rel={nofollow ? 'nofollow' : 'noreferrer'}
href={reactStringReplace(href, /:high%5B([^%5D]+)%5D/g, (match, i) => {
return match
}).join('')} {...props}
>
{children}
</a>
)
},
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img: ({ node, ...props }) => <ZoomableImage topLevel={topLevel} {...props} />
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}}
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remarkPlugins={[gfm, mention, sub, remarkDirective, myRemarkPlugin]}
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>
{children}
</ReactMarkdown>
</div>
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)
}
function ZoomableImage ({ src, topLevel, ...props }) {
if (!src) {
return null
}
const defaultMediaStyle = {
maxHeight: topLevel ? '75vh' : '25vh',
cursor: 'zoom-in'
}
// if image changes we need to update state
const [mediaStyle, setMediaStyle] = useState(defaultMediaStyle)
useEffect(() => {
setMediaStyle(defaultMediaStyle)
}, [src])
const handleClick = () => {
if (mediaStyle.cursor === 'zoom-in') {
setMediaStyle({
width: '100%',
cursor: 'zoom-out'
})
} else {
setMediaStyle(defaultMediaStyle)
}
}
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return (
<img
className={topLevel ? styles.topLevel : undefined}
style={mediaStyle}
src={src}
onClick={handleClick}
{...props}
/>
)
}