"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
const compose_1 = __importDefault(require("./compose"));
const unescapeHtml_1 = __importDefault(require("./unescapeHtml"));
const parseEmojis_1 = __importDefault(require("./parseEmojis"));
// Since VuePress needs to extract the header from the markdown source
// file and display it in the sidebar or title (#238), this file simply
// removes some unnecessary elements to make header displays well at
// sidebar or title.
//
// But header's parsing in the markdown content is done by the markdown
// loader based on markdown-it. markdown-it parser will always keep
// HTML in headers, so in VuePress, after being parsed by the markdown
// loader, the raw HTML in headers will finally be parsed by Vue-loader.
// so that we can write HTML/Vue in the header. One exception is the HTML
// wrapped by <code>(markdown token: '`') tag.
const removeMarkdownTokens = (str) => String(str)
    .replace(/(\[(.[^\]]+)\]\((.[^)]+)\))/g, '$2') // []()
    .replace(/(`|\*{1,3}|_)(.*?[^\\])\1/g, '$2') // `{t}` | *{t}* | **{t}** | ***{t}*** | _{t}_
    .replace(/(\\)(\*|_|`|\!|<)/g, '$2'); // remove escape char '\'
const trim = (str) => str.trim();
// Unescape html, parse emojis and remove some md tokens.
const parseHeaders = compose_1.default(unescapeHtml_1.default, parseEmojis_1.default, removeMarkdownTokens, trim);
module.exports = parseHeaders;