Adding warnings for non-standard escape sequence usage

spec/parser/javascript/charset_spec.js

@@ -1,4 +1,5 @@
 import javascript from 'src/js/parser/javascript/parser.js';
+import Node from 'src/js/parser/javascript/node.js';
 import util from 'src/js/util.js';
 import _ from 'lodash';
 import Snap from 'snapsvg';
@@ -49,6 +50,14 @@ describe('parser/javascript/charset.js', function() {
     });
   });
 
+  it('adds a warning for character sets the contain non-standard escapes', function() {
+    var node;
+
+    Node.state = { warnings: [] };
+    node = new javascript.Parser('[\\c]').__consume__charset();
+    expect(node.state.warnings).toEqual(['The character set "[\\c]" contains the \\c escape followed by a character other than A-Z. This can lead to different behavior depending on browser. The representation here is the most common interpretation.']);
+  });
+
   describe('_anchor property', function() {
 
     it('calculates the anchor based on the partContainer', function() {

spec/parser/javascript_spec.js

@@ -119,4 +119,13 @@ describe('parser/javascript.js', function() {
 
   });
 
+  describe('warnings property', function() {
+
+    it('returns the content of the warnings state variable', function() {
+      this.parser.state.warnings.push('example');
+      expect(this.parser.warnings).toEqual(['example']);
+    });
+
+  });
+
 });