322 lines
10 KiB
JavaScript
322 lines
10 KiB
JavaScript
import Vue from 'vue'
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import { unescape, flattenDeep } from 'lodash'
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import { getTagName, processTextForEmoji, getAttrs } from 'src/services/html_converter/utility.service.js'
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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'
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import StillImage from 'src/components/still-image/still-image.vue'
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import MentionLink from 'src/components/mention_link/mention_link.vue'
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import './rich_content.scss'
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export default Vue.component('RichContent', {
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name: 'RichContent',
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props: {
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// Original html content
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html: {
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required: true,
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type: String
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},
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// Emoji object, as in status.emojis, note the "s" at the end...
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emoji: {
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required: true,
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type: Array
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},
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// Whether to handle links or not (posts: yes, everything else: no)
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handleLinks: {
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required: false,
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type: Boolean,
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default: false
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},
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// Meme arrows
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greentext: {
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required: false,
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type: Boolean,
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default: false
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}
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},
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// NEVER EVER TOUCH DATA INSIDE RENDER
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render (h) {
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// Pre-process HTML
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const { newHtml: html, lastMentions } = preProcessPerLine(this.html, this.greentext, this.handleLinks)
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const firstMentions = [] // Mentions that appear in the beginning of post body
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const lastTags = [] // Tags that appear at the end of post body
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const writtenMentions = [] // All mentions that appear in post body
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const writtenTags = [] // All tags that appear in post body
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// unique index for vue "tag" property
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let mentionIndex = 0
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let tagsIndex = 0
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const renderImage = (tag) => {
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return <StillImage
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{...{ attrs: getAttrs(tag) }}
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class="img"
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/>
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}
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const renderHashtag = (attrs, children, encounteredTextReverse) => {
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const linkData = getLinkData(attrs, children, tagsIndex++)
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writtenTags.push(linkData)
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attrs.target = '_blank'
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if (!encounteredTextReverse) {
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lastTags.push(linkData)
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attrs['data-parser-last'] = true
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}
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return <a {...{ attrs }}>
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{ children.map(processItem) }
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</a>
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}
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const renderMention = (attrs, children, encounteredText) => {
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const linkData = getLinkData(attrs, children, mentionIndex++)
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writtenMentions.push(linkData)
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if (!encounteredText) {
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firstMentions.push(linkData)
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return ''
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} else {
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return <MentionLink
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url={attrs.href}
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content={flattenDeep(children).join('')}
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/>
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}
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}
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// We stop treating mentions as "first" ones when we encounter
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// non-whitespace text
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let encounteredText = false
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// Processor to use with html_tree_converter
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const processItem = (item, index, array, what) => {
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// Handle text nodes - just add emoji
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if (typeof item === 'string') {
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const emptyText = item.trim() === ''
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if (emptyText) {
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return encounteredText ? item : item.trim()
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}
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let unescapedItem = unescape(item)
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if (!encounteredText) {
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unescapedItem = unescapedItem.trimStart()
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encounteredText = true
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}
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if (item.includes(':')) {
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unescapedItem = processTextForEmoji(
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unescapedItem,
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this.emoji,
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({ shortcode, url }) => {
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return <StillImage
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class="emoji img"
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src={url}
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title={`:${shortcode}:`}
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alt={`:${shortcode}:`}
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/>
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}
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)
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}
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return unescapedItem
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}
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// Handle tag nodes
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if (Array.isArray(item)) {
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const [opener, children] = item
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const Tag = getTagName(opener)
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const attrs = getAttrs(opener)
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switch (Tag) {
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case 'span': // replace images with StillImage
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if (attrs['class'] && attrs['class'].includes('lastMentions')) {
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if (firstMentions.length > 1) {
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break
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} else {
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return ''
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}
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} else {
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break
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}
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case 'img': // replace images with StillImage
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return renderImage(opener)
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case 'a': // replace mentions with MentionLink
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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
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} else {
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attrs.target = '_blank'
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return <a {...{ attrs }}>
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{ children.map(processItem) }
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</a>
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}
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}
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// Render tag as is
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if (children !== undefined) {
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return <Tag {...{ attrs: getAttrs(opener) }}>
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{ children.map(processItem) }
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</Tag>
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} else {
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return <Tag/>
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}
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}
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}
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// Processor for back direction (for finding "last" stuff, just easier this way)
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let encounteredTextReverse = false
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const processItemReverse = (item, index, array, what) => {
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// Handle text nodes - just add emoji
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if (typeof item === 'string') {
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const emptyText = item.trim() === ''
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if (emptyText) return item
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if (!encounteredTextReverse) encounteredTextReverse = true
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return item
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} else if (Array.isArray(item)) {
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// Handle tag nodes
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const [opener, children] = item
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const Tag = getTagName(opener)
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switch (Tag) {
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case 'a': // replace mentions with MentionLink
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if (!this.handleLinks) break
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const attrs = getAttrs(opener)
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// should only be this
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if (attrs['class'] && attrs['class'].includes('hashtag')) {
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return renderHashtag(attrs, children, encounteredTextReverse)
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}
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}
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}
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return item
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}
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// DO NOT USE SLOTS they cause a re-render feedback loop here.
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// slots updated -> rerender -> emit -> update up the tree -> rerender -> ...
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// at least until vue3?
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const result = <span class="RichContent">
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{ convertHtmlToTree(html).map(processItem).reverse().map(processItemReverse).reverse() }
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</span>
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const event = {
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firstMentions,
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lastMentions,
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lastTags,
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writtenMentions,
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writtenTags
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}
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// DO NOT MOVE TO UPDATE. BAD IDEA.
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this.$emit('parseReady', event)
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return result
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}
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})
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const getLinkData = (attrs, children, index) => {
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return {
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index,
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url: attrs.href,
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hashtag: attrs['data-tag'],
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content: flattenDeep(children).join('')
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}
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}
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/** Pre-processing HTML
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*
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* Currently this does two things:
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* - add green/cyantexting
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* - wrap and mark last line containing only mentions as ".lastMentionsLine" for
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* more compact hellthreads.
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*
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* @param {String} html - raw HTML to process
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* @param {Boolean} greentext - whether to enable greentexting or not
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* @param {Boolean} handleLinks - whether to handle links or not
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*/
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export const preProcessPerLine = (html, greentext, handleLinks) => {
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const lastMentions = []
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let nonEmptyIndex = 0
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const newHtml = convertHtmlToLines(html).reverse().map((item, index, array) => {
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// Going over each line in reverse to detect last mentions,
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// keeping non-text stuff as-is
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if (!item.text) return item
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const string = item.text
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// Greentext stuff
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if (greentext && (string.includes('>') || string.includes('<'))) {
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const cleanedString = string.replace(/<[^>]+?>/gi, '') // remove all tags
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.replace(/@\w+/gi, '') // remove mentions (even failed ones)
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.trim()
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if (cleanedString.startsWith('>')) {
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return `<span class='greentext'>${string}</span>`
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} else if (cleanedString.startsWith('<')) {
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return `<span class='cyantext'>${string}</span>`
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}
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}
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// Converting that line part into tree
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const tree = convertHtmlToTree(string)
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// If line has loose text, i.e. text outside a mention or a tag
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// we won't touch mentions.
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let hasLooseText = false
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let hasMentions = false
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const process = (item) => {
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if (Array.isArray(item)) {
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const [opener, children, closer] = item
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const tag = getTagName(opener)
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// If we have a link we probably have mentions
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if (tag === 'a') {
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if (!handleLinks) return [opener, children, closer]
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const attrs = getAttrs(opener)
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if (attrs['class'] && attrs['class'].includes('mention')) {
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// Got mentions
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hasMentions = true
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return [opener, children, closer]
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} else {
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// Not a mention? Means we have loose text or whatever
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hasLooseText = true
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return [opener, children, closer]
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}
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} else if (tag === 'span' || tag === 'p') {
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// For span and p we need to go deeper
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return [opener, [...children].map(process), closer]
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} else {
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// Everything else equals to a loose text
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hasLooseText = true
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return [opener, children, closer]
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}
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}
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if (typeof item === 'string') {
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if (item.trim() !== '') {
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// only meaningful strings are loose text
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hasLooseText = true
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}
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return item
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}
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}
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// We now processed our tree, now we need to mark line as lastMentions
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const result = [...tree].map(process)
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// Only check last (first since list is reversed) line
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if (handleLinks && hasMentions && !hasLooseText && nonEmptyIndex++ === 0) {
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let mentionIndex = 0
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const process = (item) => {
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if (Array.isArray(item)) {
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const [opener, children] = item
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const tag = getTagName(opener)
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if (tag === 'a') {
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const attrs = getAttrs(opener)
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lastMentions.push(getLinkData(attrs, children, mentionIndex++))
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} else if (children) {
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children.forEach(process)
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}
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}
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}
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result.forEach(process)
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// we DO need mentions here so that we conditionally remove them if don't
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// have first mentions
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return ['<span class="lastMentions">', flattenDeep(result).join(''), '</span>'].join('')
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} else {
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return flattenDeep(result).join('')
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}
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}).reverse().join('')
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return { newHtml, lastMentions }
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}
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