Prism.languages.markdown = Prism.languages.extend('markup', {});
Prism.languages.insertBefore('markdown', 'prolog', {
	'blockquote': {
		// > ...
		pattern: /^>(?:[\t ]*>)*/m,
		alias: 'punctuation'
	},
	'code': [
		{
			// Prefixed by 4 spaces or 1 tab
			pattern: /^(?: {4}|\t).+/m,
			alias: 'keyword'
		},
		{
			// `code`
			// ``code``
			pattern: /``.+?``|`[^`\n]+`/,
			alias: 'keyword'
		}
	],
	'title': [
		{
			// title 1
			// =======

			// title 2
			// -------
			pattern: /\w+.*(?:\r?\n|\r)(?:==+|--+)/,
			alias: 'important',
			inside: {
				punctuation: /==+$|--+$/
			}
		},
		{
			// # title 1
			// ###### title 6
			pattern: /(^\s*)#+.+/m,
			lookbehind: true,
			alias: 'important',
			inside: {
				punctuation: /^#+|#+$/
			}
		}
	],
	'hr': {
		// ***
		// ---
		// * * *
		// -----------
		pattern: /(^\s*)([*-])(?:[\t ]*\2){2,}(?=\s*$)/m,
		lookbehind: true,
		alias: 'punctuation'
	},
	'list': {
		// * item
		// + item
		// - item
		// 1. item
		pattern: /(^\s*)(?:[*+-]|\d+\.)(?=[\t ].)/m,
		lookbehind: true,
		alias: 'punctuation'
	},
	'url-reference': {
		// [id]: http://example.com "Optional title"
		// [id]: http://example.com 'Optional title'
		// [id]: http://example.com (Optional title)
		// [id]: <http://example.com> "Optional title"
		pattern: /!?\[[^\]]+\]:[\t ]+(?:\S+|<(?:\\.|[^>\\])+>)(?:[\t ]+(?:"(?:\\.|[^"\\])*"|'(?:\\.|[^'\\])*'|\((?:\\.|[^)\\])*\)))?/,
		inside: {
			'variable': {
				pattern: /^(!?\[)[^\]]+/,
				lookbehind: true
			},
			'string': /(?:"(?:\\.|[^"\\])*"|'(?:\\.|[^'\\])*'|\((?:\\.|[^)\\])*\))$/,
			'punctuation': /^[\[\]!:]|[<>]/
		},
		alias: 'url'
	},
	'bold': {
		// **strong**
		// __strong__

		// Allow only one line break
		pattern: /(^|[^\\])(\*\*|__)(?:(?:\r?\n|\r)(?!\r?\n|\r)|.)+?\2/,
		lookbehind: true,
		inside: {
			'punctuation': /^\*\*|^__|\*\*$|__$/
		}
	},
	'italic': {
		// *em*
		// _em_

		// Allow only one line break
		pattern: /(^|[^\\])([*_])(?:(?:\r?\n|\r)(?!\r?\n|\r)|.)+?\2/,
		lookbehind: true,
		inside: {
			'punctuation': /^[*_]|[*_]$/
		}
	},
	'url': {
		// [example](http://example.com "Optional title")
		// [example] [id]
		pattern: /!?\[[^\]]+\](?:\([^\s)]+(?:[\t ]+"(?:\\.|[^"\\])*")?\)| ?\[[^\]\n]*\])/,
		inside: {
			'variable': {
				pattern: /(!?\[)[^\]]+(?=\]$)/,
				lookbehind: true
			},
			'string': {
				pattern: /"(?:\\.|[^"\\])*"(?=\)$)/
			}
		}
	}
});

Prism.languages.markdown['bold'].inside['url'] = Prism.util.clone(Prism.languages.markdown['url']);
Prism.languages.markdown['italic'].inside['url'] = Prism.util.clone(Prism.languages.markdown['url']);
Prism.languages.markdown['bold'].inside['italic'] = Prism.util.clone(Prism.languages.markdown['italic']);
Prism.languages.markdown['italic'].inside['bold'] = Prism.util.clone(Prism.languages.markdown['bold']);