/**
 * Original by Scott Helme.
 *
 * Reference: https://scotthelme.co.uk/csp-cheat-sheet/
 *
 * Supports the following:
 *  - https://www.w3.org/TR/CSP1/
 *  - https://www.w3.org/TR/CSP2/
 *  - https://www.w3.org/TR/CSP3/
 */

(function (Prism) {

	/**
	 * @param {string} source
	 * @returns {RegExp}
	 */
	function value(source) {
		return RegExp(/([ \t])/.source + '(?:' + source + ')' + /(?=[\s;]|$)/.source, 'i');
	}

	Prism.languages.csp = {
		'directive': {
			pattern: /(^|[\s;])(?:base-uri|block-all-mixed-content|(?:child|connect|default|font|frame|img|manifest|media|object|prefetch|script|style|worker)-src|disown-opener|form-action|frame-(?:ancestors|options)|input-protection(?:-(?:clip|selectors))?|navigate-to|plugin-types|policy-uri|referrer|reflected-xss|report-(?:to|uri)|require-sri-for|sandbox|(?:script|style)-src-(?:attr|elem)|upgrade-insecure-requests)(?=[\s;]|$)/i,
			lookbehind: true,
			alias: 'property'
		},
		'scheme': {
			pattern: value(/[a-z][a-z0-9.+-]*:/.source),
			lookbehind: true
		},
		'none': {
			pattern: value(/'none'/.source),
			lookbehind: true,
			alias: 'keyword'
		},
		'nonce': {
			pattern: value(/'nonce-[-+/\w=]+'/.source),
			lookbehind: true,
			alias: 'number'
		},
		'hash': {
			pattern: value(/'sha(?:256|384|512)-[-+/\w=]+'/.source),
			lookbehind: true,
			alias: 'number'
		},
		'host': {
			pattern: value(
				/[a-z][a-z0-9.+-]*:\/\/[^\s;,']*/.source +
				'|' +
				/\*[^\s;,']*/.source +
				'|' +
				/[a-z0-9-]+(?:\.[a-z0-9-]+)+(?::[\d*]+)?(?:\/[^\s;,']*)?/.source
			),
			lookbehind: true,
			alias: 'url',
			inside: {
				'important': /\*/
			}
		},
		'keyword': [
			{
				pattern: value(/'unsafe-[a-z-]+'/.source),
				lookbehind: true,
				alias: 'unsafe'
			},
			{
				pattern: value(/'[a-z-]+'/.source),
				lookbehind: true,
				alias: 'safe'
			},
		],
		'punctuation': /;/
	};

}(Prism));