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 { LightAsync as SyntaxHighlighter } from 'react-syntax-highlighter'
import atomDark from 'react-syntax-highlighter/dist/cjs/styles/prism/atom-dark'
import mention from '@/lib/remark-mention'
import sub from '@/lib/remark-sub'
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import React, { useState, memo, useRef, useCallback, useMemo, useEffect } from 'react'
import { slug } from 'github-slugger'
import LinkIcon from '@/svgs/link.svg'
import Thumb from '@/svgs/thumb-up-fill.svg'
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import { toString } from 'mdast-util-to-string'
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import copy from 'clipboard-copy'
import MediaOrLink from './media-or-link'
import { IMGPROXY_URL_REGEXP, parseInternalLinks, decodeProxyUrl } from '@/lib/url'
import reactStringReplace from 'react-string-replace'
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import { rehypeInlineCodeProperty, rehypeStyler } from '@/lib/md'
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import { Button } from 'react-bootstrap'
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import { useRouter } from 'next/router'
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import Link from 'next/link'
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import { UNKNOWN_LINK_REL } from '@/lib/constants'
import isEqual from 'lodash/isEqual'
import UserPopover from './user-popover'
import ItemPopover from './item-popover'
import classNames from 'classnames'
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// Explicitely defined start/end tags & which CSS class from text.module.css to apply
export const rehypeSuperscript = () => rehypeStyler('<sup>', '</sup>', styles.superscript)
export const rehypeSubscript = () => rehypeStyler('<sub>', '</sub>', styles.subscript)
export function SearchText ({ text }) {
return (
<div className={styles.text}>
<p className={styles.p}>
{reactStringReplace(text, /\*\*\*([^*]+)\*\*\*/g, (match, i) => {
return <mark key={`strong-${match}-${i}`}>{match}</mark>
})}
</p>
</div>
)
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}
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// this is one of the slowest components to render
export default memo(function Text ({ rel, imgproxyUrls, children, tab, itemId, outlawed, topLevel, noFragments }) {
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const [overflowing, setOverflowing] = useState(false)
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const router = useRouter()
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const [show, setShow] = useState(false)
const containerRef = useRef(null)
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useEffect(() => {
setShow(router.asPath.includes('#'))
const handleRouteChange = (url, { shallow }) => {
setShow(url.includes('#'))
}
router.events.on('hashChangeStart', handleRouteChange)
return () => {
router.events.off('hashChangeStart', handleRouteChange)
}
}, [router])
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useEffect(() => {
const container = containerRef.current
if (!container || overflowing) return
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function checkOverflow () {
setOverflowing(container.scrollHeight > window.innerHeight * 2)
}
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let resizeObserver
if (!overflowing && 'ResizeObserver' in window) {
resizeObserver = new window.ResizeObserver(checkOverflow).observe(container)
}
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window.addEventListener('resize', checkOverflow)
checkOverflow()
return () => {
window.removeEventListener('resize', checkOverflow)
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resizeObserver?.disconnect()
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}
}, [containerRef.current, setOverflowing])
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const Heading = useCallback(({ children, node, ...props }) => {
const [copied, setCopied] = useState(false)
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const nodeText = toString(node)
const id = useMemo(() => noFragments ? undefined : slug(nodeText.replace(/[^\w\-\s]+/gi, '')), [nodeText, noFragments])
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const h = useMemo(() => {
if (topLevel) {
return node?.TagName
}
const h = parseInt(node?.tagName?.replace('h', '') || 0)
if (h < 4) return `h${h + 3}`
return 'h6'
}, [node, topLevel])
const Icon = copied ? Thumb : LinkIcon
return (
<span className={styles.heading}>
{React.createElement(h || node?.tagName, { id, ...props }, children)}
{!noFragments && topLevel &&
<a className={`${styles.headingLink} ${copied ? styles.copied : ''}`} href={`#${id}`}>
<Icon
onClick={() => {
const location = new URL(window.location)
location.hash = `${id}`
copy(location.href)
setTimeout(() => setCopied(false), 1500)
setCopied(true)
}}
width={18}
height={18}
className='fill-grey'
/>
</a>}
</span>
)
}, [topLevel, noFragments])
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const Table = useCallback(({ node, ...props }) =>
<span className='table-responsive'>
<table className='table table-bordered table-sm' {...props} />
</span>, [])
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const Code = useCallback(({ node, inline, className, children, style, ...props }) => {
return inline
? (
<code className={className} {...props}>
{children}
</code>
)
: (
<SyntaxHighlighter style={atomDark} language='text' PreTag='div' {...props}>
{children}
</SyntaxHighlighter>
)
}, [])
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const P = useCallback(({ children, node, ...props }) => <div className={styles.p} {...props}>{children}</div>, [])
const TextMediaOrLink = useCallback(({ node, src, ...props }) => {
const url = IMGPROXY_URL_REGEXP.test(src) ? decodeProxyUrl(src) : src
// if outlawed, render the media link as text
if (outlawed) {
return url
}
const srcSet = imgproxyUrls?.[url]
return <MediaOrLink srcSet={srcSet} tab={tab} src={src} rel={rel ?? UNKNOWN_LINK_REL} {...props} topLevel={topLevel} />
}, [imgproxyUrls, topLevel, tab])
const components = useMemo(() => ({
h1: Heading,
h2: Heading,
h3: Heading,
h4: Heading,
h5: Heading,
h6: Heading,
table: Table,
p: P,
li: props => {
return <li {...props} id={props.id && itemId ? `${props.id}-${itemId}` : props.id} />
},
code: Code,
a: ({ node, href, children, ...props }) => {
children = children ? Array.isArray(children) ? children : [children] : []
// don't allow zoomable images to be wrapped in links
if (children.some(e => e?.props?.node?.tagName === 'img')) {
return <>{children}</>
}
// if outlawed, render the link as text
if (outlawed) {
return href
}
// If [text](url) was parsed as <a> and text is not empty and not a link itself,
// we don't render it as an image since it was probably a conscious choice to include text.
const text = children[0]
let url
try {
url = !href.startsWith('/') && new URL(href)
} catch {
// ignore invalid URLs
}
const internalURL = process.env.NEXT_PUBLIC_URL
if (!!text && !/^https?:\/\//.test(text)) {
if (props['data-footnote-ref'] || typeof props['data-footnote-backref'] !== 'undefined') {
return (
<Link
{...props}
id={props.id && itemId ? `${props.id}-${itemId}` : props.id}
href={itemId ? `${href}-${itemId}` : href}
>{text}
</Link>
)
}
if (text.startsWith?.('@')) {
// user mention might be within a markdown link like this: [@user foo bar](url)
const name = text.replace('@', '').split(' ')[0]
return (
<UserPopover name={name}>
<Link
id={props.id}
href={href}
>
{text}
</Link>
</UserPopover>
)
} else if (href.startsWith('/') || url?.origin === internalURL) {
try {
const { linkText } = parseInternalLinks(href)
if (linkText) {
return (
<ItemPopover id={linkText.replace('#', '').split('/')[0]}>
<Link href={href}>{text}</Link>
</ItemPopover>
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)
}
} catch {
// ignore errors like invalid URLs
}
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return (
<Link
id={props.id}
href={href}
>
{text}
</Link>
)
}
return (
// eslint-disable-next-line
<a id={props.id} target='_blank' rel={rel ?? UNKNOWN_LINK_REL} href={href}>{text}</a>
)
}
try {
const { linkText } = parseInternalLinks(href)
if (linkText) {
return (
<ItemPopover id={linkText.replace('#', '').split('/')[0]}>
<Link href={href}>{linkText}</Link>
</ItemPopover>
)
}
} catch {
// ignore errors like invalid URLs
}
// assume the link is an image which will fallback to link if it's not
return <TextMediaOrLink src={href} rel={rel ?? UNKNOWN_LINK_REL} {...props}>{children}</TextMediaOrLink>
},
img: TextMediaOrLink
}), [outlawed, rel, itemId, Code, P, Heading, Table, TextMediaOrLink])
const remarkPlugins = useMemo(() => [gfm, mention, sub], [])
const rehypePlugins = useMemo(() => [rehypeInlineCodeProperty, rehypeSuperscript, rehypeSubscript], [])
return (
<div className={classNames(styles.text, topLevel && styles.topLevel, show ? styles.textUncontained : overflowing && styles.textContained)} ref={containerRef}>
<ReactMarkdown
components={components}
remarkPlugins={remarkPlugins}
rehypePlugins={rehypePlugins}
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>
{children}
</ReactMarkdown>
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{overflowing && !show &&
<Button size='lg' variant='info' className={styles.textShowFull} onClick={() => setShow(true)}>
show full text
</Button>}
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</div>
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)
}, isEqual)