(function (factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? (module['exports'] = factory()) :
		typeof define === 'function' && define['amd'] ? define(factory()) :
			(window['stylisRuleSheet'] = factory())
}(function () {

	'use strict'

	return function (insertRule) {
		var delimiter = '/*|*/'
		var needle = delimiter+'}'

		function toSheet (block) {
			if (block)
				try {
					insertRule(block + '}')
				} catch (e) {}
		}

		return function ruleSheet (context, content, selectors, parents, line, column, length, ns, depth, at) {
			switch (context) {
				// property
				case 1:
					// @import
					if (depth === 0 && content.charCodeAt(0) === 64)
						return insertRule(content+';'), ''
					break
				// selector
				case 2:
					if (ns === 0)
						return content + delimiter
					break
				// at-rule
				case 3:
					switch (ns) {
						// @font-face, @page
						case 102:
						case 112:
							return insertRule(selectors[0]+content), ''
						default:
							return content + (at === 0 ? delimiter : '')
					}
				case -2:
					content.split(needle).forEach(toSheet)
			}
		}
	}
}))