akkoma-fe/src/components/rich_content/rich_content.jsx

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import Vue from 'vue'
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import { unescape, flattenDeep } from 'lodash'
import { getTagName, processTextForEmoji, getAttrs } from 'src/services/html_converter/utility.service.js'
import { convertHtmlToTree } from 'src/services/html_converter/html_tree_converter.service.js'
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import { convertHtmlToLines } from 'src/services/html_converter/html_line_converter.service.js'
import StillImage from 'src/components/still-image/still-image.vue'
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import MentionLink from 'src/components/mention_link/mention_link.vue'
import './rich_content.scss'
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/**
* RichContent, The Über-powered component for rendering Post HTML.
*
* This takes post HTML and does multiple things to it:
* - Converts mention links to <MentionLink>-s
* - Removes mentions from beginning and end (hellthread style only)
* - Replaces emoji shortcodes with <StillImage>'d images.
*
* Stuff like removing mentions from beginning and end is done so that they could
* be either replaced by collapsible <MentionsLine> or moved to separate place.
* There are two problems with this component's architecture:
* 1. Parsing HTML and rendering are inseparable. Attempts to separate the two
* proven to be a massive overcomplication due to amount of things done here.
* 2. We need to output both render and some extra data, which seems to be imp-
* possible in vue. Current solution is to emit 'parseReady' event when parsing
* is done within render() function.
*
* Apart from that one small hiccup with emit in render this _should_ be vue3-ready
*/
export default Vue.component('RichContent', {
name: 'RichContent',
props: {
// Original html content
html: {
required: true,
type: String
},
// Emoji object, as in status.emojis, note the "s" at the end...
emoji: {
required: true,
type: Array
},
// Whether to handle links or not (posts: yes, everything else: no)
handleLinks: {
required: false,
type: Boolean,
default: false
},
// Meme arrows
greentext: {
required: false,
type: Boolean,
default: false
}
},
// NEVER EVER TOUCH DATA INSIDE RENDER
render (h) {
// Pre-process HTML
const { newHtml: html, lastMentions } = preProcessPerLine(this.html, this.greentext, this.handleLinks)
const firstMentions = [] // Mentions that appear in the beginning of post body
const lastTags = [] // Tags that appear at the end of post body
const writtenMentions = [] // All mentions that appear in post body
const writtenTags = [] // All tags that appear in post body
// unique index for vue "tag" property
let mentionIndex = 0
let tagsIndex = 0
const renderImage = (tag) => {
return <StillImage
{...{ attrs: getAttrs(tag) }}
class="img"
/>
}
const renderHashtag = (attrs, children, encounteredTextReverse) => {
const linkData = getLinkData(attrs, children, tagsIndex++)
writtenTags.push(linkData)
attrs.target = '_blank'
if (!encounteredTextReverse) {
lastTags.push(linkData)
attrs['data-parser-last'] = true
}
return <a {...{ attrs }}>
{ children.map(processItem) }
</a>
}
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const renderMention = (attrs, children, encounteredText) => {
const linkData = getLinkData(attrs, children, mentionIndex++)
writtenMentions.push(linkData)
if (!encounteredText) {
firstMentions.push(linkData)
return ''
} else {
return <MentionLink
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url={attrs.href}
content={flattenDeep(children).join('')}
/>
}
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}
// We stop treating mentions as "first" ones when we encounter
// non-whitespace text
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let encounteredText = false
// Processor to use with html_tree_converter
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const processItem = (item, index, array, what) => {
// Handle text nodes - just add emoji
if (typeof item === 'string') {
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const emptyText = item.trim() === ''
if (emptyText) {
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return encounteredText ? item : item.trim()
}
let unescapedItem = unescape(item)
if (!encounteredText) {
unescapedItem = unescapedItem.trimStart()
encounteredText = true
}
if (item.includes(':')) {
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unescapedItem = processTextForEmoji(
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unescapedItem,
this.emoji,
({ shortcode, url }) => {
return <StillImage
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class="emoji img"
src={url}
title={`:${shortcode}:`}
alt={`:${shortcode}:`}
/>
}
)
}
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return unescapedItem
}
// Handle tag nodes
if (Array.isArray(item)) {
const [opener, children] = item
const Tag = getTagName(opener)
const attrs = getAttrs(opener)
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switch (Tag) {
case 'span': // replace images with StillImage
if (attrs['class'] && attrs['class'].includes('lastMentions')) {
if (firstMentions.length > 1) {
break
} else {
return ''
}
} else {
break
}
case 'img': // replace images with StillImage
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return renderImage(opener)
case 'a': // replace mentions with MentionLink
if (!this.handleLinks) break
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if (attrs['class'] && attrs['class'].includes('mention')) {
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return renderMention(attrs, children, encounteredText)
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} else if (attrs['class'] && attrs['class'].includes('hashtag')) {
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encounteredText = true
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return item // We'll handle it later
} else {
attrs.target = '_blank'
return <a {...{ attrs }}>
{ children.map(processItem) }
</a>
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}
}
// Render tag as is
if (children !== undefined) {
return <Tag {...{ attrs: getAttrs(opener) }}>
{ children.map(processItem) }
</Tag>
} else {
return <Tag/>
}
}
}
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// Processor for back direction (for finding "last" stuff, just easier this way)
let encounteredTextReverse = false
const processItemReverse = (item, index, array, what) => {
// Handle text nodes - just add emoji
if (typeof item === 'string') {
const emptyText = item.trim() === ''
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if (emptyText) return item
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if (!encounteredTextReverse) encounteredTextReverse = true
return item
} else if (Array.isArray(item)) {
// Handle tag nodes
const [opener, children] = item
const Tag = getTagName(opener)
switch (Tag) {
case 'a': // replace mentions with MentionLink
if (!this.handleLinks) break
const attrs = getAttrs(opener)
// should only be this
if (attrs['class'] && attrs['class'].includes('hashtag')) {
return renderHashtag(attrs, children, encounteredTextReverse)
}
}
}
return item
}
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// DO NOT USE SLOTS they cause a re-render feedback loop here.
// slots updated -> rerender -> emit -> update up the tree -> rerender -> ...
// at least until vue3?
const result = <span class="RichContent">
{ convertHtmlToTree(html).map(processItem).reverse().map(processItemReverse).reverse() }
</span>
const event = {
firstMentions,
lastMentions,
lastTags,
writtenMentions,
writtenTags
}
// DO NOT MOVE TO UPDATE. BAD IDEA.
this.$emit('parseReady', event)
return result
}
})
const getLinkData = (attrs, children, index) => {
return {
index,
url: attrs.href,
hashtag: attrs['data-tag'],
content: flattenDeep(children).join('')
}
}
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/** Pre-processing HTML
*
* Currently this does two things:
* - add green/cyantexting
* - wrap and mark last line containing only mentions as ".lastMentionsLine" for
* more compact hellthreads.
*
* @param {String} html - raw HTML to process
* @param {Boolean} greentext - whether to enable greentexting or not
* @param {Boolean} handleLinks - whether to handle links or not
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*/
export const preProcessPerLine = (html, greentext, handleLinks) => {
const lastMentions = []
const greentextHandle = new Set(['p', 'div'])
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let nonEmptyIndex = -1
const newHtml = convertHtmlToLines(html).reverse().map((item, index, array) => {
// Going over each line in reverse to detect last mentions,
// keeping non-text stuff as-is
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if (!item.text) return item
const string = item.text
nonEmptyIndex += 1
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// Greentext stuff
if (
// Only if greentext is engaged
greentext &&
// Only handle p's and divs. Don't want to affect blocquotes, code etc
item.level.every(l => greentextHandle.has(l)) &&
// Only if line begins with '>' or '<'
(string.includes('&gt;') || string.includes('&lt;'))
) {
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const cleanedString = string.replace(/<[^>]+?>/gi, '') // remove all tags
.replace(/@\w+/gi, '') // remove mentions (even failed ones)
.trim()
if (cleanedString.startsWith('&gt;')) {
return `<span class='greentext'>${string}</span>`
} else if (cleanedString.startsWith('&lt;')) {
return `<span class='cyantext'>${string}</span>`
}
}
// Converting that line part into tree
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const tree = convertHtmlToTree(string)
// If line has loose text, i.e. text outside a mention or a tag
// we won't touch mentions.
let hasLooseText = false
let hasMentions = false
const process = (item) => {
if (Array.isArray(item)) {
const [opener, children, closer] = item
const tag = getTagName(opener)
// If we have a link we probably have mentions
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if (tag === 'a') {
if (!handleLinks) return [opener, children, closer]
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const attrs = getAttrs(opener)
if (attrs['class'] && attrs['class'].includes('mention')) {
// Got mentions
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hasMentions = true
return [opener, children, closer]
} else {
// Not a mention? Means we have loose text or whatever
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hasLooseText = true
return [opener, children, closer]
}
} else if (tag === 'span' || tag === 'p') {
// For span and p we need to go deeper
return [opener, [...children].map(process), closer]
} else {
// Everything else equals to a loose text
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hasLooseText = true
return [opener, children, closer]
}
}
if (typeof item === 'string') {
if (item.trim() !== '') {
// only meaningful strings are loose text
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hasLooseText = true
}
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return item
}
}
// We now processed our tree, now we need to mark line as lastMentions
const result = [...tree].map(process)
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// Only check last (first since list is reversed) line
if (handleLinks && hasMentions && !hasLooseText && nonEmptyIndex++ === 0) {
let mentionIndex = 0
const process = (item) => {
if (Array.isArray(item)) {
const [opener, children] = item
const tag = getTagName(opener)
if (tag === 'a') {
const attrs = getAttrs(opener)
lastMentions.push(getLinkData(attrs, children, mentionIndex++))
} else if (children) {
children.forEach(process)
}
}
}
result.forEach(process)
// we DO need mentions here so that we conditionally remove them if don't
// have first mentions
return ['<span class="lastMentions">', flattenDeep(result).join(''), '</span>'].join('')
} else {
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return flattenDeep(result).join('')
}
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}).reverse().join('')
return { newHtml, lastMentions }
}