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14aa8556 | 1 | import * as MarkdownIt from 'markdown-it' |
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2 | import { buildVideoLink } from 'src/assets/player/utils' |
3 | import { Injectable } from '@angular/core' | |
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4 | import { |
5 | COMPLETE_RULES, | |
6 | ENHANCED_RULES, | |
7 | ENHANCED_WITH_HTML_RULES, | |
8 | TEXT_RULES, | |
9 | TEXT_WITH_HTML_RULES | |
10 | } from '@shared/core-utils/renderer/markdown' | |
67ed6552 | 11 | import { HtmlRendererService } from './html-renderer.service' |
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12 | |
13 | type MarkdownParsers = { | |
14 | textMarkdownIt: MarkdownIt | |
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15 | textWithHTMLMarkdownIt: MarkdownIt |
16 | ||
7e049ea4 | 17 | enhancedMarkdownIt: MarkdownIt |
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18 | enhancedWithHTMLMarkdownIt: MarkdownIt |
19 | ||
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20 | completeMarkdownIt: MarkdownIt |
21 | } | |
22 | ||
23 | type MarkdownConfig = { | |
24 | rules: string[] | |
25 | html: boolean | |
26 | escape?: boolean | |
27 | } | |
28 | ||
29 | type MarkdownParserConfigs = { | |
30 | [id in keyof MarkdownParsers]: MarkdownConfig | |
31 | } | |
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32 | |
33 | @Injectable() | |
34 | export class MarkdownService { | |
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35 | private markdownParsers: MarkdownParsers = { |
36 | textMarkdownIt: null, | |
3131c13e | 37 | textWithHTMLMarkdownIt: null, |
7e049ea4 | 38 | enhancedMarkdownIt: null, |
3131c13e | 39 | enhancedWithHTMLMarkdownIt: null, |
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40 | completeMarkdownIt: null |
41 | } | |
42 | private parsersConfig: MarkdownParserConfigs = { | |
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43 | textMarkdownIt: { rules: TEXT_RULES, html: false }, |
44 | textWithHTMLMarkdownIt: { rules: TEXT_WITH_HTML_RULES, html: true, escape: true }, | |
3131c13e | 45 | |
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46 | enhancedMarkdownIt: { rules: ENHANCED_RULES, html: false }, |
47 | enhancedWithHTMLMarkdownIt: { rules: ENHANCED_WITH_HTML_RULES, html: true, escape: true }, | |
3131c13e | 48 | |
9ff36c2d | 49 | completeMarkdownIt: { rules: COMPLETE_RULES, html: true } |
7e049ea4 | 50 | } |
621d99f5 | 51 | |
7e049ea4 | 52 | constructor (private htmlRenderer: HtmlRendererService) {} |
9d9597df | 53 | |
0672dc76 | 54 | textMarkdownToHTML (markdown: string, withHtml = false, withEmoji = false) { |
55 | if (withHtml) return this.render('textWithHTMLMarkdownIt', markdown, withEmoji) | |
3131c13e | 56 | |
0672dc76 | 57 | return this.render('textMarkdownIt', markdown, withEmoji) |
7e049ea4 | 58 | } |
66b16caf | 59 | |
0672dc76 | 60 | enhancedMarkdownToHTML (markdown: string, withHtml = false, withEmoji = false) { |
61 | if (withHtml) return this.render('enhancedWithHTMLMarkdownIt', markdown, withEmoji) | |
41d71344 | 62 | |
0672dc76 | 63 | return this.render('enhancedMarkdownIt', markdown, withEmoji) |
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64 | } |
65 | ||
3131c13e | 66 | completeMarkdownToHTML (markdown: string) { |
0672dc76 | 67 | return this.render('completeMarkdownIt', markdown, true) |
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68 | } |
69 | ||
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70 | async processVideoTimestamps (html: string) { |
71 | return html.replace(/((\d{1,2}):)?(\d{1,2}):(\d{1,2})/g, function (str, _, h, m, s) { | |
72 | const t = (3600 * +(h || 0)) + (60 * +(m || 0)) + (+(s || 0)) | |
73 | const url = buildVideoLink({ startTime: t }) | |
74 | return `<a class="video-timestamp" href="${url}">${str}</a>` | |
75 | }) | |
76 | } | |
77 | ||
0672dc76 | 78 | private async render (name: keyof MarkdownParsers, markdown: string, withEmoji = false) { |
53055a11 | 79 | if (!markdown) return '' |
07fa4c97 | 80 | |
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81 | const config = this.parsersConfig[ name ] |
82 | if (!this.markdownParsers[ name ]) { | |
83 | this.markdownParsers[ name ] = await this.createMarkdownIt(config) | |
0672dc76 | 84 | |
85 | if (withEmoji) { | |
04c7f701 | 86 | // TODO: write types |
87 | const emoji = require('markdown-it-emoji/light') | |
88 | this.markdownParsers[ name ].use(emoji) | |
0672dc76 | 89 | } |
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90 | } |
91 | ||
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92 | let html = this.markdownParsers[ name ].render(markdown) |
93 | html = this.avoidTruncatedTags(html) | |
621d99f5 | 94 | |
7e049ea4 | 95 | if (config.escape) return this.htmlRenderer.toSafeHtml(html) |
1eb23e12 | 96 | |
7e049ea4 | 97 | return html |
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98 | } |
99 | ||
7e049ea4 | 100 | private async createMarkdownIt (config: MarkdownConfig) { |
14aa8556 | 101 | // FIXME: import('...') returns a struct module, containing a "default" field |
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102 | const MarkdownItClass: typeof import ('markdown-it') = (await import('markdown-it') as any).default |
103 | ||
7e049ea4 | 104 | const markdownIt = new MarkdownItClass('zero', { linkify: true, breaks: true, html: config.html }) |
621d99f5 | 105 | |
7e049ea4 | 106 | for (const rule of config.rules) { |
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107 | markdownIt.enable(rule) |
108 | } | |
109 | ||
110 | this.setTargetToLinks(markdownIt) | |
111 | ||
112 | return markdownIt | |
113 | } | |
3d9eaae3 | 114 | |
41d71344 | 115 | private setTargetToLinks (markdownIt: MarkdownIt) { |
9d9597df | 116 | // Snippet from markdown-it documentation: https://github.com/markdown-it/markdown-it/blob/master/docs/architecture.md#renderer |
3d9eaae3 | 117 | const defaultRender = markdownIt.renderer.rules.link_open || function (tokens, idx, options, env, self) { |
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118 | return self.renderToken(tokens, idx, options) |
119 | } | |
120 | ||
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121 | markdownIt.renderer.rules.link_open = function (tokens, index, options, env, self) { |
122 | const token = tokens[index] | |
9d9597df | 123 | |
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124 | const targetIndex = token.attrIndex('target') |
125 | if (targetIndex < 0) token.attrPush([ 'target', '_blank' ]) | |
126 | else token.attrs[targetIndex][1] = '_blank' | |
127 | ||
128 | const relIndex = token.attrIndex('rel') | |
129 | if (relIndex < 0) token.attrPush([ 'rel', 'noopener noreferrer' ]) | |
130 | else token.attrs[relIndex][1] = 'noopener noreferrer' | |
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131 | |
132 | // pass token to default renderer. | |
632c5e36 | 133 | return defaultRender(tokens, index, options, env, self) |
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134 | } |
135 | } | |
07fa4c97 | 136 | |
8eaa6d62 | 137 | private avoidTruncatedTags (html: string) { |
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138 | return html.replace(/\*\*?([^*]+)$/, '$1') |
139 | .replace(/<a[^>]+>([^<]+)<\/a>\s*...((<\/p>)|(<\/li>)|(<\/strong>))?$/mi, '$1...') | |
b29bf61d | 140 | .replace(/\[[^\]]+\]\(([^\)]+)$/m, '$1') |
f5b72c39 | 141 | .replace(/\s?\[[^\]]+\]?[.]{3}<\/p>$/m, '...</p>') |
07fa4c97 | 142 | } |
9d9597df | 143 | } |