1 import { Injectable } from '@angular/core'
3 import * as MarkdownIt from 'markdown-it'
6 export class MarkdownService {
7 private textMarkdownIt: MarkdownIt.MarkdownIt
8 private linkifier: MarkdownIt.MarkdownIt
9 private enhancedMarkdownIt: MarkdownIt.MarkdownIt
12 this.textMarkdownIt = new MarkdownIt('zero', { linkify: true, breaks: true })
19 this.setTargetToLinks(this.textMarkdownIt)
21 this.enhancedMarkdownIt = new MarkdownIt('zero', { linkify: true, breaks: true })
29 this.setTargetToLinks(this.enhancedMarkdownIt)
31 this.linkifier = new MarkdownIt('zero', { linkify: true })
33 this.setTargetToLinks(this.linkifier)
36 textMarkdownToHTML (markdown: string) {
37 const html = this.textMarkdownIt.render(markdown)
39 return this.avoidTruncatedLinks(html)
42 enhancedMarkdownToHTML (markdown: string) {
43 const html = this.enhancedMarkdownIt.render(markdown)
45 return this.avoidTruncatedLinks(html)
48 linkify (text: string) {
49 const html = this.linkifier.render(text)
51 return this.avoidTruncatedLinks(html)
54 private setTargetToLinks (markdownIt: MarkdownIt.MarkdownIt) {
55 // Snippet from markdown-it documentation: https://github.com/markdown-it/markdown-it/blob/master/docs/architecture.md#renderer
56 const defaultRender = markdownIt.renderer.rules.link_open || function (tokens, idx, options, env, self) {
57 return self.renderToken(tokens, idx, options)
60 markdownIt.renderer.rules.link_open = function (tokens, idx, options, env, self) {
61 // If you are sure other plugins can't add `target` - drop check below
62 const aIndex = tokens[idx].attrIndex('target')
65 tokens[idx].attrPush(['target', '_blank']) // add new attribute
67 tokens[idx].attrs[aIndex][1] = '_blank' // replace value of existing attr
70 // pass token to default renderer.
71 return defaultRender(tokens, idx, options, env, self)
75 private avoidTruncatedLinks (html) {
76 return html.replace(/<a[^>]+>([^<]+)<\/a>\s*...(<\/p>)?$/mi, '$1...')