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import React from 'react';
import { Link } from '@material-ui/core';
import axios from 'axios';
import { InlineParserPropTypes } from './types';
interface RegexPair {
global: RegExp;
local: RegExp;
}
interface Emoji {
name: string;
char: string;
}
const enclosureRegex = (e: string): RegexPair => ({
local: new RegExp(`${e}([^${e}]+)${e}`),
global: new RegExp(`(${e}[^${e}]+${e})`)
});
const regex: Record<string, RegexPair> = {
conceal: {
global: /(!?\[.+?\]\(.+?\))/g,
local: /!?\[(.+?)\]\((.+?)\)/
},
rawLink: {
global: /((?:(?:[A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=+$,\w]+@)?[A-Za-z0-9.-]+|(?:www\.|[-;:&=+$,\w]+@)[A-Za-z0-9.-]+)(?:(?:\/[+~%/.\w-_]*)?\??(?:[-+=&;%@.\w_]*)#?(?:[.!/\\\w]*))?)/,
local: /&^/
},
emoji: enclosureRegex(':'),
bold: enclosureRegex('\\*\\*'),
italic: enclosureRegex('\\*'),
code: enclosureRegex('`'),
strikeThrough: enclosureRegex('~~'),
}
const splitter = new RegExp(Object.values(regex).map(pair => pair.global.source).join('|'));
const emojiList: Emoji[] = [];
axios.get('https://unpkg.com/emojilib@2.4.0/emojis.json').then(response => {
Object.keys(response.data).forEach(name => emojiList.push({ name, char: response.data[name].char }));
});
const InlineSyntax: React.FC<InlineParserPropTypes> = ({ line }) => {
if (!line) return null;
const matchConceal = regex.conceal.local.exec(line);
if (matchConceal) {
if (line[0] === '!') return <img src={matchConceal[2]} alt={matchConceal[1]} style={{ maxWidth: '100%', maxHeight: '100%' }} />;
return <Link href={matchConceal[2]}>{matchConceal[1]}</Link>;
}
const matchEmoji = line.match(regex.emoji.local);
if (matchEmoji) {
const emoji = emojiList.find(emoji => emoji.name === matchEmoji[1]);
return <span>{emoji ? emoji.char : line}</span>;
}
const matchCode = line.match(regex.code.local);
if (matchCode) return <span style={{ background: 'rgba(255, 255, 255, .1)' }}>{matchCode[1]}</span>;
const matchBold = line.match(regex.bold.local);
if (matchBold) return <b>{matchBold[1]}</b>;
const matchItalic = line.match(regex.italic.local);
if (matchItalic) return <i>{matchItalic[1]}</i>;
const matchStrikeThrough = line.match(regex.strikeThrough.local);
if (matchStrikeThrough) return <span style={{textDecoration: 'line-through' }}>{matchStrikeThrough[1]}</span>;
if (line.match(regex.rawLink.global)) return <Link href={line}>{line}</Link>;
return <>{line}</>;
}
export { splitter };
export default InlineSyntax;
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