elk/composables/content.ts

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2022-11-20 21:21:53 +00:00
import type { DefaultTreeAdapterMap } from 'parse5'
import { parseFragment, serialize } from 'parse5'
import type { VNode } from 'vue'
import { Fragment, h } from 'vue'
import { RouterLink } from 'vue-router'
type Node = DefaultTreeAdapterMap['childNode']
type Element = DefaultTreeAdapterMap['element']
const UserLinkRE = /^https?:\/\/([^/]+)\/@([^/]+)$/
const TagLinkRE = /^https?:\/\/([^/]+)\/tags\/([^/]+)$/
export function defaultHandle(el: Element) {
// Redirect mentions to the user page
if (el.tagName === 'a' && el.attrs.find(i => i.name === 'class' && i.value.includes('mention'))) {
const href = el.attrs.find(i => i.name === 'href')
if (href) {
const matchUser = href.value.match(UserLinkRE)
if (matchUser) {
const [, server, username] = matchUser
href.value = `/@${username}@${server}`
}
const matchTag = href.value.match(TagLinkRE)
if (matchTag) {
const [, , name] = matchTag
href.value = `/tags/${name}`
}
}
}
return el
}
export function contentToVNode(
content: string,
handle: (node: Element) => Element | undefined | null | void = defaultHandle,
): VNode {
const tree = parseFragment(content)
return h(Fragment, tree.childNodes.map(n => treeToVNode(n, handle)))
}
export function treeToVNode(
input: Node,
handle: (node: Element) => Element | undefined | null | void = defaultHandle,
): VNode | string | null {
if (input.nodeName === '#text')
// @ts-expect-error casing
return input.value
if ('childNodes' in input) {
const node = handle(input)
if (node == null)
return null
const attrs = Object.fromEntries(node.attrs.map(i => [i.name, i.value]))
if (node.nodeName === 'a' && (attrs.href?.startsWith('/') || attrs.href?.startsWith('.'))) {
attrs.to = attrs.href
delete attrs.href
delete attrs.target
return h(
RouterLink as any,
attrs,
node.childNodes.map(n => treeToVNode(n, handle)),
)
}
return h(
node.nodeName,
attrs,
node.childNodes.map(n => treeToVNode(n, handle)),
)
}
return null
}