141 lines
3.8 KiB
TypeScript
141 lines
3.8 KiB
TypeScript
import type { Emoji } from 'masto'
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import type { DefaultTreeAdapterMap } from 'parse5'
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import { parseFragment } from 'parse5'
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import type { Component, VNode } from 'vue'
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import { Fragment, h, isVNode } from 'vue'
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import { RouterLink } from 'vue-router'
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import MarkdownIt from 'markdown-it'
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import ContentCode from '~/components/content/ContentCode.vue'
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type Node = DefaultTreeAdapterMap['childNode']
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type Element = DefaultTreeAdapterMap['element']
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const CUSTOM_BLOCKS: Record<string, Component> = {
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'custom-code': ContentCode,
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}
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function handleMention(el: Element) {
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// Redirect mentions to the user page
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if (el.tagName === 'a' && el.attrs.find(i => i.name === 'class' && i.value.includes('mention'))) {
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const href = el.attrs.find(i => i.name === 'href')
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if (href) {
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const matchUser = href.value.match(UserLinkRE)
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if (matchUser) {
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const [, server, username] = matchUser
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// Handles need to ignore server subdomains
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href.value = `/@${username}@${server.replace(/(.+\.)(.+\..+)/, '$2')}`
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}
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const matchTag = href.value.match(TagLinkRE)
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if (matchTag) {
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const [, , name] = matchTag
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href.value = `/tags/${name}`
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}
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}
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}
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return undefined
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}
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function handleBlocks(el: Element) {
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if (el.tagName in CUSTOM_BLOCKS) {
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const block = CUSTOM_BLOCKS[el.tagName]
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const attrs = Object.fromEntries(el.attrs.map(i => [i.name, i.value]))
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return h(block, attrs, () => el.childNodes.map(treeToVNode))
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}
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}
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function handleNode(el: Element) {
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return handleBlocks(el) || handleMention(el) || el
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}
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const md = new MarkdownIt({ html: true })
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md.renderer.rules.fence = (tokens, idx) => {
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const token = tokens[idx]
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return `<custom-code lang="${token.info.trim().toLowerCase() || ''}" code="${encodeURIComponent(token.content)}"></custom-code>\n`
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}
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export function contentToVNode(
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content: string,
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customEmojis: Record<string, Emoji> = {},
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): VNode {
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content = md.render(htmlToText(content)
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.trim()
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// handle custom emojis
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.replace(/:([\w-]+?):/g, (_, name) => {
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const emoji = customEmojis[name]
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if (emoji)
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return `<img src="${emoji.url}" alt="${name}" class="custom-emoji" />`
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return `:${name}:`
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}))
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const tree = parseFragment(content)
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return h(Fragment, tree.childNodes.map(n => treeToVNode(n)))
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}
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export function treeToVNode(
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input: Node,
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): VNode | string | null {
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if (input.nodeName === '#text')
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// @ts-expect-error casing
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return input.value
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if ('childNodes' in input) {
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const node = handleNode(input)
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if (node == null)
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return null
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if (isVNode(node))
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return node
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const attrs = Object.fromEntries(node.attrs.map(i => [i.name, i.value]))
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if (node.nodeName === 'a' && (attrs.href?.startsWith('/') || attrs.href?.startsWith('.'))) {
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attrs.to = attrs.href
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delete attrs.href
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delete attrs.target
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return h(
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RouterLink as any,
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attrs,
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() => node.childNodes.map(treeToVNode),
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)
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}
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return h(
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node.nodeName,
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attrs,
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node.childNodes.map(treeToVNode),
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)
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}
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return null
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}
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export function htmlToText(html: string) {
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const tree = parseFragment(html)
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return tree.childNodes.map(n => treeToText(n)).join('').trim()
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}
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function treeToText(input: Node): string {
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let pre = ''
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let body = ''
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let post = ''
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if (input.nodeName === '#text')
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// @ts-expect-error casing
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return input.value
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if (input.nodeName === 'br')
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return '\n'
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if (['p', 'pre'].includes(input.nodeName))
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pre = '\n'
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if (input.nodeName === 'code') {
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const clz = input.attrs.find(attr => attr.name === 'class')
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const lang = clz?.value.replace('language-', '')
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pre = `\`\`\`${lang || ''}\n`
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post = '\n```'
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}
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if ('childNodes' in input)
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body = input.childNodes.map(n => treeToText(n)).join('')
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return pre + body + post
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}
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