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9d9597df C |
1 | import { Injectable } from '@angular/core' |
2 | ||
3 | import * as MarkdownIt from 'markdown-it' | |
4 | ||
5 | @Injectable() | |
6 | export class MarkdownService { | |
7 | private markdownIt: MarkdownIt.MarkdownIt | |
8 | ||
9 | constructor () { | |
10 | this.markdownIt = new MarkdownIt('zero', { linkify: true }) | |
11 | .enable('linkify') | |
12 | .enable('autolink') | |
13 | .enable('emphasis') | |
14 | .enable('link') | |
15 | .enable('newline') | |
16 | ||
66b16caf C |
17 | this.setTargetToLinks() |
18 | } | |
19 | ||
20 | markdownToHTML (markdown: string) { | |
21 | const html = this.markdownIt.render(markdown) | |
22 | ||
23 | // Avoid linkify truncated links | |
24 | return html.replace(/<a[^>]+>([^<]+)<\/a>\s*...(<\/p>)?$/mi, '$1...') | |
25 | } | |
26 | ||
27 | private setTargetToLinks () { | |
9d9597df C |
28 | // Snippet from markdown-it documentation: https://github.com/markdown-it/markdown-it/blob/master/docs/architecture.md#renderer |
29 | const defaultRender = this.markdownIt.renderer.rules.link_open || function (tokens, idx, options, env, self) { | |
30 | return self.renderToken(tokens, idx, options) | |
31 | } | |
32 | ||
33 | this.markdownIt.renderer.rules.link_open = function (tokens, idx, options, env, self) { | |
34 | // If you are sure other plugins can't add `target` - drop check below | |
35 | const aIndex = tokens[idx].attrIndex('target') | |
36 | ||
37 | if (aIndex < 0) { | |
38 | tokens[idx].attrPush(['target', '_blank']) // add new attribute | |
39 | } else { | |
40 | tokens[idx].attrs[aIndex][1] = '_blank' // replace value of existing attr | |
41 | } | |
42 | ||
43 | // pass token to default renderer. | |
44 | return defaultRender(tokens, idx, options, env, self) | |
45 | } | |
46 | } | |
9d9597df | 47 | } |