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1 | import { Injectable } from '@angular/core' |
2 | ||
41d71344 | 3 | import { MarkdownIt } from 'markdown-it' |
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4 | |
5 | @Injectable() | |
6 | export class MarkdownService { | |
621d99f5 C |
7 | static TEXT_RULES = [ |
8 | 'linkify', | |
9 | 'autolink', | |
10 | 'emphasis', | |
11 | 'link', | |
12 | 'newline', | |
13 | 'list' | |
14 | ] | |
15 | static ENHANCED_RULES = MarkdownService.TEXT_RULES.concat([ 'image' ]) | |
1eb23e12 | 16 | static COMPLETE_RULES = MarkdownService.ENHANCED_RULES.concat([ 'block', 'inline', 'heading', 'html_inline', 'html_block', 'paragraph' ]) |
621d99f5 | 17 | |
41d71344 C |
18 | private textMarkdownIt: MarkdownIt |
19 | private enhancedMarkdownIt: MarkdownIt | |
1eb23e12 | 20 | private completeMarkdownIt: MarkdownIt |
9d9597df | 21 | |
41d71344 | 22 | async textMarkdownToHTML (markdown: string) { |
53055a11 | 23 | if (!markdown) return '' |
66b16caf | 24 | |
41d71344 C |
25 | if (!this.textMarkdownIt) { |
26 | this.textMarkdownIt = await this.createMarkdownIt(MarkdownService.TEXT_RULES) | |
27 | } | |
28 | ||
53055a11 | 29 | const html = this.textMarkdownIt.render(markdown) |
8eaa6d62 | 30 | return this.avoidTruncatedTags(html) |
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31 | } |
32 | ||
41d71344 | 33 | async enhancedMarkdownToHTML (markdown: string) { |
53055a11 | 34 | if (!markdown) return '' |
07fa4c97 | 35 | |
41d71344 C |
36 | if (!this.enhancedMarkdownIt) { |
37 | this.enhancedMarkdownIt = await this.createMarkdownIt(MarkdownService.ENHANCED_RULES) | |
38 | } | |
39 | ||
53055a11 | 40 | const html = this.enhancedMarkdownIt.render(markdown) |
8eaa6d62 | 41 | return this.avoidTruncatedTags(html) |
66b16caf | 42 | } |
621d99f5 | 43 | |
1eb23e12 C |
44 | async completeMarkdownToHTML (markdown: string) { |
45 | if (!markdown) return '' | |
46 | ||
47 | if (!this.completeMarkdownIt) { | |
48 | this.completeMarkdownIt = await this.createMarkdownIt(MarkdownService.COMPLETE_RULES, true) | |
49 | } | |
50 | ||
51 | const html = this.completeMarkdownIt.render(markdown) | |
52 | return this.avoidTruncatedTags(html) | |
53 | } | |
54 | ||
55 | private async createMarkdownIt (rules: string[], html = false) { | |
56 | // FIXME: import('...') returns a struct module, containing a "default" field corresponding to our sanitizeHtml function | |
41d71344 C |
57 | const MarkdownItClass: typeof import ('markdown-it') = (await import('markdown-it') as any).default |
58 | ||
1eb23e12 | 59 | const markdownIt = new MarkdownItClass('zero', { linkify: true, breaks: true, html }) |
621d99f5 | 60 | |
c4710631 | 61 | for (const rule of rules) { |
621d99f5 C |
62 | markdownIt.enable(rule) |
63 | } | |
64 | ||
65 | this.setTargetToLinks(markdownIt) | |
66 | ||
67 | return markdownIt | |
68 | } | |
3d9eaae3 | 69 | |
41d71344 | 70 | private setTargetToLinks (markdownIt: MarkdownIt) { |
9d9597df | 71 | // Snippet from markdown-it documentation: https://github.com/markdown-it/markdown-it/blob/master/docs/architecture.md#renderer |
3d9eaae3 | 72 | const defaultRender = markdownIt.renderer.rules.link_open || function (tokens, idx, options, env, self) { |
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73 | return self.renderToken(tokens, idx, options) |
74 | } | |
75 | ||
632c5e36 C |
76 | markdownIt.renderer.rules.link_open = function (tokens, index, options, env, self) { |
77 | const token = tokens[index] | |
9d9597df | 78 | |
632c5e36 C |
79 | const targetIndex = token.attrIndex('target') |
80 | if (targetIndex < 0) token.attrPush([ 'target', '_blank' ]) | |
81 | else token.attrs[targetIndex][1] = '_blank' | |
82 | ||
83 | const relIndex = token.attrIndex('rel') | |
84 | if (relIndex < 0) token.attrPush([ 'rel', 'noopener noreferrer' ]) | |
85 | else token.attrs[relIndex][1] = 'noopener noreferrer' | |
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86 | |
87 | // pass token to default renderer. | |
632c5e36 | 88 | return defaultRender(tokens, index, options, env, self) |
9d9597df C |
89 | } |
90 | } | |
07fa4c97 | 91 | |
8eaa6d62 | 92 | private avoidTruncatedTags (html: string) { |
e182430a C |
93 | return html.replace(/\*\*?([^*]+)$/, '$1') |
94 | .replace(/<a[^>]+>([^<]+)<\/a>\s*...((<\/p>)|(<\/li>)|(<\/strong>))?$/mi, '$1...') | |
040467f5 | 95 | .replace(/\[[^\]]+\]?\(?([^\)]+)$/, '$1') |
e182430a | 96 | |
07fa4c97 | 97 | } |
9d9597df | 98 | } |