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9d9597df | 1 | import { Injectable } from '@angular/core' |
d68ebf0b | 2 | import { buildVideoLink } from '../../../assets/player/utils' |
7e049ea4 | 3 | import { HtmlRendererService } from '@app/shared/renderer/html-renderer.service' |
14aa8556 | 4 | import * as MarkdownIt from 'markdown-it' |
7e049ea4 C |
5 | |
6 | type MarkdownParsers = { | |
7 | textMarkdownIt: MarkdownIt | |
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8 | textWithHTMLMarkdownIt: MarkdownIt |
9 | ||
7e049ea4 | 10 | enhancedMarkdownIt: MarkdownIt |
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11 | enhancedWithHTMLMarkdownIt: MarkdownIt |
12 | ||
7e049ea4 C |
13 | completeMarkdownIt: MarkdownIt |
14 | } | |
15 | ||
16 | type MarkdownConfig = { | |
17 | rules: string[] | |
18 | html: boolean | |
19 | escape?: boolean | |
20 | } | |
21 | ||
22 | type MarkdownParserConfigs = { | |
23 | [id in keyof MarkdownParsers]: MarkdownConfig | |
24 | } | |
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25 | |
26 | @Injectable() | |
27 | export class MarkdownService { | |
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28 | static TEXT_RULES = [ |
29 | 'linkify', | |
30 | 'autolink', | |
31 | 'emphasis', | |
32 | 'link', | |
33 | 'newline', | |
34 | 'list' | |
35 | ] | |
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36 | static TEXT_WITH_HTML_RULES = MarkdownService.TEXT_RULES.concat([ 'html_inline', 'html_block' ]) |
37 | ||
621d99f5 | 38 | static ENHANCED_RULES = MarkdownService.TEXT_RULES.concat([ 'image' ]) |
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39 | static ENHANCED_WITH_HTML_RULES = MarkdownService.TEXT_WITH_HTML_RULES.concat([ 'image' ]) |
40 | ||
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41 | static COMPLETE_RULES = MarkdownService.ENHANCED_WITH_HTML_RULES.concat([ 'block', 'inline', 'heading', 'paragraph' ]) |
42 | ||
43 | private markdownParsers: MarkdownParsers = { | |
44 | textMarkdownIt: null, | |
3131c13e | 45 | textWithHTMLMarkdownIt: null, |
7e049ea4 | 46 | enhancedMarkdownIt: null, |
3131c13e | 47 | enhancedWithHTMLMarkdownIt: null, |
7e049ea4 C |
48 | completeMarkdownIt: null |
49 | } | |
50 | private parsersConfig: MarkdownParserConfigs = { | |
51 | textMarkdownIt: { rules: MarkdownService.TEXT_RULES, html: false }, | |
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52 | textWithHTMLMarkdownIt: { rules: MarkdownService.TEXT_WITH_HTML_RULES, html: true, escape: true }, |
53 | ||
7e049ea4 | 54 | enhancedMarkdownIt: { rules: MarkdownService.ENHANCED_RULES, html: false }, |
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55 | enhancedWithHTMLMarkdownIt: { rules: MarkdownService.ENHANCED_WITH_HTML_RULES, html: true, escape: true }, |
56 | ||
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57 | completeMarkdownIt: { rules: MarkdownService.COMPLETE_RULES, html: true } |
58 | } | |
621d99f5 | 59 | |
7e049ea4 | 60 | constructor (private htmlRenderer: HtmlRendererService) {} |
9d9597df | 61 | |
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62 | textMarkdownToHTML (markdown: string, withHtml = false) { |
63 | if (withHtml) return this.render('textWithHTMLMarkdownIt', markdown) | |
64 | ||
7e049ea4 C |
65 | return this.render('textMarkdownIt', markdown) |
66 | } | |
66b16caf | 67 | |
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68 | enhancedMarkdownToHTML (markdown: string, withHtml = false) { |
69 | if (withHtml) return this.render('enhancedWithHTMLMarkdownIt', markdown) | |
41d71344 | 70 | |
7e049ea4 | 71 | return this.render('enhancedMarkdownIt', markdown) |
07fa4c97 C |
72 | } |
73 | ||
3131c13e | 74 | completeMarkdownToHTML (markdown: string) { |
7e049ea4 C |
75 | return this.render('completeMarkdownIt', markdown) |
76 | } | |
77 | ||
b29bf61d RK |
78 | async processVideoTimestamps (html: string) { |
79 | return html.replace(/((\d{1,2}):)?(\d{1,2}):(\d{1,2})/g, function (str, _, h, m, s) { | |
80 | const t = (3600 * +(h || 0)) + (60 * +(m || 0)) + (+(s || 0)) | |
81 | const url = buildVideoLink({ startTime: t }) | |
82 | return `<a class="video-timestamp" href="${url}">${str}</a>` | |
83 | }) | |
84 | } | |
85 | ||
7e049ea4 | 86 | private async render (name: keyof MarkdownParsers, markdown: string) { |
53055a11 | 87 | if (!markdown) return '' |
07fa4c97 | 88 | |
7e049ea4 C |
89 | const config = this.parsersConfig[ name ] |
90 | if (!this.markdownParsers[ name ]) { | |
91 | this.markdownParsers[ name ] = await this.createMarkdownIt(config) | |
41d71344 C |
92 | } |
93 | ||
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94 | let html = this.markdownParsers[ name ].render(markdown) |
95 | html = this.avoidTruncatedTags(html) | |
621d99f5 | 96 | |
7e049ea4 | 97 | if (config.escape) return this.htmlRenderer.toSafeHtml(html) |
1eb23e12 | 98 | |
7e049ea4 | 99 | return html |
1eb23e12 C |
100 | } |
101 | ||
7e049ea4 | 102 | private async createMarkdownIt (config: MarkdownConfig) { |
14aa8556 | 103 | // FIXME: import('...') returns a struct module, containing a "default" field |
41d71344 C |
104 | const MarkdownItClass: typeof import ('markdown-it') = (await import('markdown-it') as any).default |
105 | ||
7e049ea4 | 106 | const markdownIt = new MarkdownItClass('zero', { linkify: true, breaks: true, html: config.html }) |
621d99f5 | 107 | |
7e049ea4 | 108 | for (const rule of config.rules) { |
621d99f5 C |
109 | markdownIt.enable(rule) |
110 | } | |
111 | ||
112 | this.setTargetToLinks(markdownIt) | |
113 | ||
114 | return markdownIt | |
115 | } | |
3d9eaae3 | 116 | |
41d71344 | 117 | private setTargetToLinks (markdownIt: MarkdownIt) { |
9d9597df | 118 | // Snippet from markdown-it documentation: https://github.com/markdown-it/markdown-it/blob/master/docs/architecture.md#renderer |
3d9eaae3 | 119 | const defaultRender = markdownIt.renderer.rules.link_open || function (tokens, idx, options, env, self) { |
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120 | return self.renderToken(tokens, idx, options) |
121 | } | |
122 | ||
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123 | markdownIt.renderer.rules.link_open = function (tokens, index, options, env, self) { |
124 | const token = tokens[index] | |
9d9597df | 125 | |
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126 | const targetIndex = token.attrIndex('target') |
127 | if (targetIndex < 0) token.attrPush([ 'target', '_blank' ]) | |
128 | else token.attrs[targetIndex][1] = '_blank' | |
129 | ||
130 | const relIndex = token.attrIndex('rel') | |
131 | if (relIndex < 0) token.attrPush([ 'rel', 'noopener noreferrer' ]) | |
132 | else token.attrs[relIndex][1] = 'noopener noreferrer' | |
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133 | |
134 | // pass token to default renderer. | |
632c5e36 | 135 | return defaultRender(tokens, index, options, env, self) |
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136 | } |
137 | } | |
07fa4c97 | 138 | |
8eaa6d62 | 139 | private avoidTruncatedTags (html: string) { |
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140 | return html.replace(/\*\*?([^*]+)$/, '$1') |
141 | .replace(/<a[^>]+>([^<]+)<\/a>\s*...((<\/p>)|(<\/li>)|(<\/strong>))?$/mi, '$1...') | |
b29bf61d | 142 | .replace(/\[[^\]]+\]\(([^\)]+)$/m, '$1') |
f5b72c39 | 143 | .replace(/\s?\[[^\]]+\]?[.]{3}<\/p>$/m, '...</p>') |
07fa4c97 | 144 | } |
9d9597df | 145 | } |