PostCSS plugin, close #2

package.json

@@ -1,7 +1,13 @@
 {
+	"keywords": [
+		"postcss-plugin"
+	],
 	"scripts": {
 		"test": "make test"
 	},
+	"dependencies": {
+		"postcss": "^5.0.2"
+	},
 	"devDependencies": {
 		"browserstack-runner": "^0.3.7",
 		"connect": "^3.4.0",

postcss-plugin.js

@@ -0,0 +1,19 @@
+/*eslint-env node */
+var postcss = require('postcss');
+
+module.exports = postcss.plugin('cq-prolyfill', function () {
+	'use strict';
+	return function (css) {
+		css.walkRules(/:container\(/i, function (rule) {
+			rule.selectors = rule.selectors.map(function(selector) {
+				return selector.replace(/:container\([^)]*\)/gi, function(match) {
+					return '.' + match
+						.replace(/([a-z])\s+([a-z])/gi, '$1|$2')
+						.replace(/\s+/g, '')
+						.replace(/[[\]!"#$%&'()*+,./:;<=>?@^`{|}~]/g, '\\$&')
+						.toLowerCase();
+				});
+			});
+		});
+	};
+});