issue-813 -- Adds no-domains rule

lib/config/sass-lint.yml

@@ -25,6 +25,7 @@ rules:
   no-css-comments: 1
   no-debug: 1
   no-disallowed-properties: 0
+  no-domains: 1
   no-duplicate-properties: 1
   no-empty-rulesets: 1
   no-extends: 0

lib/rules/no-domains.js

@@ -0,0 +1,37 @@
+'use strict';
+
+var helpers = require('../helpers');
+var url = require('url');
+
+var stripQuotes = function (str) {
+  return str.substring(1, str.length - 1);
+};
+
+module.exports = {
+  'name': 'no-domains',
+  'defaults': {},
+  'detect': function (ast, parser) {
+    var result = [];
+
+    ast.traverseByType('uri', function (uri) {
+      uri.traverse(function (item) {
+        if (item.is('string')) {
+          var stripped = stripQuotes(item.content),
+              parsedUrl = url.parse(stripped, false, true);
+
+          if (parsedUrl.host) {
+            result = helpers.addUnique(result, {
+              'ruleId': parser.rule.name,
+              'severity': parser.severity,
+              'line': item.end.line,
+              'column': item.end.column,
+              'message': 'Domains in URLs are disallowed'
+            });
+          }
+        }
+      });
+    });
+
+    return result;
+  }
+};