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Deduplicate code (#217)

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* Deduplicate code

Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de>
This commit is contained in:
mrdrogdrog 2020-06-20 20:32:44 +02:00 • committed by GitHub
parent ab2a73c6a8
commit 5f4cc63eb4
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5 changed files with 46 additions and 40 deletions
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47
src/components/editor/markdown-preview/markdown-preview.tsx
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@ -1,15 +1,16 @@
import { DomElement } from 'domhandler'
import MarkdownIt from 'markdown-it'
import abbreviation from 'markdown-it-abbr'
import markdownItContainer from 'markdown-it-container'
import definitionList from 'markdown-it-deflist'
import emoji from 'markdown-it-emoji'
import footnote from 'markdown-it-footnote'
import inserted from 'markdown-it-ins'
import marked from 'markdown-it-mark'
import markdownItRegex from 'markdown-it-regex'
import subscript from 'markdown-it-sub'
import superscript from 'markdown-it-sup'
import taskList from 'markdown-it-task-lists'
import footnote from 'markdown-it-footnote'
import React, { ReactElement, useMemo } from 'react'
import ReactHtmlParser, { convertNodeToElement, Transform } from 'react-html-parser'
import { createRenderContainer, validAlertLevels } from './container-plugins/alert'
@ -33,13 +34,25 @@ export interface MarkdownPreviewProps {
content: string
}
export type ComponentReplacer = (node: DomElement, counterMap: Map<string, number>) => (ReactElement | undefined);
const allComponentReplacers: ComponentReplacer[] = [getYouTubeReplacement, getVimeoReplacement, getGistReplacement, getPDFReplacement]
type ComponentReplacer2Identifier2CounterMap = Map<ComponentReplacer, Map<string, number>>
const tryToReplaceNode = (node: DomElement, componentReplacer2Identifier2CounterMap: ComponentReplacer2Identifier2CounterMap) => {
return allComponentReplacers
.map((componentReplacer) => {
const identifier2CounterMap = componentReplacer2Identifier2CounterMap.get(componentReplacer) || new Map<string, number>()
return componentReplacer(node, identifier2CounterMap)
})
.find((replacement) => !!replacement)
}
const MarkdownPreview: React.FC<MarkdownPreviewProps> = ({ content }) => {
const markdownIt = useMemo(() => {
const md = new MarkdownIt('default', {
html: true,
breaks: true,
langPrefix: '',
linkify: false,
typographer: true
})
md.use(taskList)
@ -70,36 +83,12 @@ const MarkdownPreview: React.FC<MarkdownPreviewProps> = ({ content }) => {
}, [])
const result: ReactElement[] = useMemo(() => {
const youtubeIdCounterMap = new Map<string, number>()
const vimeoIdCounterMap = new Map<string, number>()
const gistIdCounterMap = new Map<string, number>()
const componentReplacer2Identifier2CounterMap = new Map<ComponentReplacer, Map<string, number>>()
const html: string = markdownIt.render(content)
const transform: Transform = (node, index) => {
const resultYT = getYouTubeReplacement(node, youtubeIdCounterMap)
if (resultYT) {
return resultYT
}
const resultVimeo = getVimeoReplacement(node, vimeoIdCounterMap)
if (resultVimeo) {
return resultVimeo
}
const resultGist = getGistReplacement(node, gistIdCounterMap)
if (resultGist) {
return resultGist
}
const resultPdf = getPDFReplacement(node, gistIdCounterMap)
if (resultPdf) {
return resultPdf
}
return convertNodeToElement(node, index, transform)
return tryToReplaceNode(node, componentReplacer2Identifier2CounterMap) || convertNodeToElement(node, index, transform)
}
const ret: ReactElement[] = ReactHtmlParser(html, { transform: transform })
return ret
return ReactHtmlParser(html, { transform: transform })
}, [content, markdownIt])
return (