elk/composables/content-render.ts

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import { ELEMENT_NODE, TEXT_NODE } from 'ultrahtml'
import type { ElementNode, Node } from 'ultrahtml'
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import { Fragment, h, isVNode } from 'vue'
import type { VNode } from 'vue'
import { RouterLink } from 'vue-router'
import { decode } from 'tiny-decode'
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import type { ContentParseOptions } from './content-parse'
import { parseMastodonHTML } from './content-parse'
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import Emoji from '~/components/emoji/Emoji.vue'
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import ContentCode from '~/components/content/ContentCode.vue'
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import ContentMentionGroup from '~/components/content/ContentMentionGroup.vue'
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import AccountHoverWrapper from '~/components/account/AccountHoverWrapper.vue'
import TagHoverWrapper from '~/components/account/TagHoverWrapper.vue'
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function getTextualAstComponents(astChildren: Node[]): string {
return astChildren
.filter(({ type }) => type === TEXT_NODE)
.map(({ value }) => value)
.reduce((accumulator, current) => accumulator + current, '')
.trim()
}
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/**
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* Raw HTML to VNodes.
*
* @param content HTML content.
* @param options Options.
*/
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export function contentToVNode(
content: string,
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options?: ContentParseOptions,
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): VNode {
let tree = parseMastodonHTML(content, options)
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const textContents = getTextualAstComponents(tree.children)
// if the username only contains emojis, we should probably show the emojis anyway to avoid a blank name
if (options?.hideEmojis && textContents.length === 0)
tree = parseMastodonHTML(content, { ...options, hideEmojis: false })
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return h(Fragment, (tree.children as Node[] || []).map(n => treeToVNode(n)))
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}
export function nodeToVNode(node: Node): VNode | string | null {
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if (node.type === TEXT_NODE)
return node.value
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if (node.name === 'mention-group')
return h(ContentMentionGroup, node.attributes, () => node.children.map(treeToVNode))
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// add tooltip to emojis
if (node.name === 'picture' || (node.name === 'img' && node.attributes?.alt)) {
const props = node.attributes ?? {}
props.as = node.name
return h(
Emoji,
props,
() => node.children.map(treeToVNode),
)
}
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if ('children' in node) {
if (node.name === 'a' && (node.attributes.href?.startsWith('/') || node.attributes.href?.startsWith('.'))) {
node.attributes.to = node.attributes.href
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const { href: _href, target: _target, ...attrs } = node.attributes
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return h(
RouterLink as any,
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attrs,
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() => node.children.map(treeToVNode),
)
}
return h(
node.name,
node.attributes,
node.children.map(treeToVNode),
)
}
return null
}
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function treeToVNode(
input: Node,
): VNode | string | null {
if (!input)
return null
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if (input.type === TEXT_NODE)
return decode(input.value)
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if ('children' in input) {
const node = handleNode(input)
if (node == null)
return null
if (isVNode(node))
return node
return nodeToVNode(node)
}
return null
}
function addBdiNode(node: Node) {
if (node.children.length === 1 && node.children[0].type === ELEMENT_NODE && node.children[0].name === 'bdi')
return
const children = node.children.splice(0, node.children.length)
const bdi = {
name: 'bdi',
parent: node,
loc: node.loc,
type: ELEMENT_NODE,
attributes: {},
children,
} satisfies ElementNode
children.forEach((n: Node) => n.parent = bdi)
node.children.push(bdi)
}
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function handleMention(el: Node) {
// Redirect mentions to the user page
if (el.name === 'a' && el.attributes.class?.includes('mention')) {
const href = el.attributes.href
if (href) {
const matchUser = href.match(UserLinkRE)
if (matchUser) {
const [, server, username] = matchUser
const handle = `${username}@${server.replace(/(.+\.)(.+\..+)/, '$2')}`
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el.attributes.href = `/${server}/@${username}`
addBdiNode(el)
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return h(AccountHoverWrapper, { handle, class: 'inline-block' }, () => nodeToVNode(el))
}
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const matchTag = href.match(TagLinkRE)
if (matchTag) {
const [, , tagName] = matchTag
addBdiNode(el)
el.attributes.href = `/${currentServer.value}/tags/${tagName}`
return h(TagHoverWrapper, { tagName, class: 'inline-block' }, () => nodeToVNode(el))
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}
}
}
return undefined
}
function handleCodeBlock(el: Node) {
if (el.name === 'pre' && el.children[0]?.name === 'code') {
const codeEl = el.children[0] as Node
const classes = codeEl.attributes.class as string
const lang = classes?.split(/\s/g).find(i => i.startsWith('language-'))?.replace('language-', '')
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const code = (codeEl.children && codeEl.children.length > 0)
? recursiveTreeToText(codeEl)
: ''
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return h(ContentCode, { lang, code: encodeURIComponent(code) })
}
}
function handleNode(el: Node) {
return handleCodeBlock(el) || handleMention(el) || el
}