ebnf.js
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	/*
	Language: Extended Backus-Naur Form
	Author: Alex McKibben <alex@nullscope.net>
	Website: https://en.wikipedia.org/wiki/Extended_Backus–Naur_form
	*/

	/** @type LanguageFn */
	function ebnf(hljs) {
	const commentMode = hljs.COMMENT(/\(\/, /\\)/);

	const nonTerminalMode = {
	className: "attribute",
	begin: /^[ ][a-zA-Z]+([\s_-]+[a-zA-Z]+)/
	};

	const specialSequenceMode = {
	className: "meta",
	begin: /\?.*\?/
	};

	const ruleBodyMode = {
	begin: /=/,
	end: /[.;]/,
	contains: [
	commentMode,
	specialSequenceMode,
	{
	// terminals
	className: 'string',
	variants: [
	hljs.APOS_STRING_MODE,
	hljs.QUOTE_STRING_MODE,
	{
	begin: '`',
	end: '`'
	}
	]
	}
	]
	};

	return {
	name: 'Extended Backus-Naur Form',
	illegal: /\S/,
	contains: [
	commentMode,
	nonTerminalMode,
	ruleBodyMode
	]
	};
	}

	module.exports = ebnf;