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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 | |
3d9eaae3 | 8 | private linkifier: MarkdownIt.MarkdownIt |
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9 | |
10 | constructor () { | |
36f9424f | 11 | this.markdownIt = new MarkdownIt('zero', { linkify: true, breaks: true }) |
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12 | .enable('linkify') |
13 | .enable('autolink') | |
14 | .enable('emphasis') | |
15 | .enable('link') | |
16 | .enable('newline') | |
36f9424f | 17 | .enable('list') |
3d9eaae3 | 18 | this.setTargetToLinks(this.markdownIt) |
9d9597df | 19 | |
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20 | this.linkifier = new MarkdownIt('zero', { linkify: true }) |
21 | .enable('linkify') | |
22 | this.setTargetToLinks(this.linkifier) | |
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23 | } |
24 | ||
25 | markdownToHTML (markdown: string) { | |
26 | const html = this.markdownIt.render(markdown) | |
27 | ||
28 | // Avoid linkify truncated links | |
29 | return html.replace(/<a[^>]+>([^<]+)<\/a>\s*...(<\/p>)?$/mi, '$1...') | |
30 | } | |
31 | ||
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32 | linkify (text: string) { |
33 | return this.linkifier.render(text) | |
34 | } | |
35 | ||
36 | private setTargetToLinks (markdownIt: MarkdownIt.MarkdownIt) { | |
9d9597df | 37 | // Snippet from markdown-it documentation: https://github.com/markdown-it/markdown-it/blob/master/docs/architecture.md#renderer |
3d9eaae3 | 38 | const defaultRender = markdownIt.renderer.rules.link_open || function (tokens, idx, options, env, self) { |
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39 | return self.renderToken(tokens, idx, options) |
40 | } | |
41 | ||
3d9eaae3 | 42 | markdownIt.renderer.rules.link_open = function (tokens, idx, options, env, self) { |
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43 | // If you are sure other plugins can't add `target` - drop check below |
44 | const aIndex = tokens[idx].attrIndex('target') | |
45 | ||
46 | if (aIndex < 0) { | |
47 | tokens[idx].attrPush(['target', '_blank']) // add new attribute | |
48 | } else { | |
49 | tokens[idx].attrs[aIndex][1] = '_blank' // replace value of existing attr | |
50 | } | |
51 | ||
52 | // pass token to default renderer. | |
53 | return defaultRender(tokens, idx, options, env, self) | |
54 | } | |
55 | } | |
9d9597df | 56 | } |