misskey/src/client/app/common/views/components/misskey-flavored-markdown.ts

import Vue from 'vue';
import * as emojilib from 'emojilib';
import parse from '../../../../../text/parse';
import getAcct from '../../../../../acct/render';
import { url } from '../../../config';
import MkUrl from './url.vue';
import MkGoogle from './google.vue';

const flatten = list => list.reduce(
	(a, b) => a.concat(Array.isArray(b) ? flatten(b) : b), []
);

export default Vue.component('misskey-flavored-markdown', {
	props: {
		text: {
			type: String,
			required: true
		},
		ast: {
			type: [],
			required: false
		},
		shouldBreak: {
			type: Boolean,
			default: true
		},
		i: {
			type: Object,
			default: null
		}
	},

	render(createElement) {
		let ast;

		if (this.ast == null) {
			// Parse text to ast
			ast = parse(this.text);
		} else {
			ast = this.ast;
		}

		if (ast.filter(x => x.type != 'hashtag').length == 0) {
			return;
		}

		while (ast[ast.length - 1] && (
			ast[ast.length - 1].type == 'hashtag' ||
			(ast[ast.length - 1].type == 'text' && ast[ast.length - 1].content == ' ') ||
			(ast[ast.length - 1].type == 'text' && ast[ast.length - 1].content == '\n'))) {
			ast.pop();
		}

		// Parse ast to DOM
		const els = flatten(ast.map(token => {
			switch (token.type) {
				case 'text':
					const text = token.content.replace(/(\r\n|\n|\r)/g, '\n');

					if (this.shouldBreak) {
						const x = text.split('\n')
							.map(t => t == '' ? [createElement('br')] : [createElement('span', t), createElement('br')]);
						x[x.length - 1].pop();
						return x;
					} else {
						return createElement('span', text.replace(/\n/g, ' '));
					}

				case 'bold':
					return createElement('strong', token.bold);

				case 'url':
					return createElement(MkUrl, {
						props: {
							url: token.content,
							target: '_blank'
						}
					});

				case 'link':
					return createElement('a', {
						attrs: {
							class: 'link',
							href: token.url,
							target: '_blank',
							title: token.url
						}
					}, token.title);

				case 'mention':
					return (createElement as any)('a', {
						attrs: {
							href: `${url}/@${getAcct(token)}`,
							target: '_blank',
							dataIsMe: (this as any).i && getAcct((this as any).i) == getAcct(token)
						},
						directives: [{
							name: 'user-preview',
							value: token.content
						}]
					}, token.content);

				case 'hashtag':
					return createElement('a', {
						attrs: {
							href: `${url}/tags/${token.hashtag}`,
							target: '_blank'
						}
					}, token.content);

				case 'code':
					return createElement('pre', {
						class: 'code'
					}, [
						createElement('code', {
							domProps: {
								innerHTML: token.html
							}
						})
					]);

				case 'inline-code':
					return createElement('code', {
						domProps: {
							innerHTML: token.html
						}
					});

				case 'quote':
					const text2 = token.quote.replace(/(\r\n|\n|\r)/g, '\n');

					if (this.shouldBreak) {
						const x = text2.split('\n')
							.map(t => [createElement('span', t), createElement('br')]);
						x[x.length - 1].pop();
						return createElement('div', {
							attrs: {
								class: 'quote'
							}
						}, x);
					} else {
						return createElement('span', {
							attrs: {
								class: 'quote'
							}
						}, text2.replace(/\n/g, ' '));
					}

				case 'title':
					return createElement('div', {
						attrs: {
							class: 'title'
						}
					}, token.title);

				case 'emoji':
					const emoji = emojilib.lib[token.emoji];
					return createElement('span', emoji ? emoji.char : token.content);

				case 'search':
					return createElement(MkGoogle, {
						props: {
							q: token.query
						}
					});

				default:
					console.log('unknown ast type:', token.type);
			}
		}));

		const _els = [];
		els.forEach((el, i) => {
			if (el.tag == 'br') {
				if (!['div', 'pre'].includes(els[i - 1].tag)) {
					_els.push(el);
				}
			} else {
				_els.push(el);
			}
		});

		return createElement('span', _els);
	}
});