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']);
+    });
+
+  });
+
 });

spec/regexper_spec.js

@@ -11,6 +11,7 @@ describe('regexper.js', function() {
     this.root.innerHTML = [
       '<form id="regexp-form" action="/"><input type="text" id="regexp-input" /></form>',
       '<div id="error"></div>',
+      '<ul id="warnings"></ul>',
       '<div><a href="#" data-glyph="link-intact"></a></div>',
       '<div><a href="#" data-glyph="data-transfer-download"></a></div>',
       '<div id="progress"><div></div></div>',
@@ -355,6 +356,15 @@ describe('regexper.js', function() {
 
   });
 
+  describe('#displayWarnings', function() {
+
+    it('adds a list item for each warning', function() {
+      this.regexper.displayWarnings(['warning 1', 'warning 2']);
+      expect(this.regexper.warnings.innerHTML).toEqual('<li class="oi with-text" data-glyph="warning">warning 1</li><li class="oi with-text" data-glyph="warning">warning 2</li>');
+    });
+
+  });
+
   describe('#renderRegexp', function() {
 
     beforeEach(function() {
@@ -366,6 +376,7 @@ describe('regexper.js', function() {
 
       spyOn(this.regexper, '_trackEvent');
       spyOn(this.regexper, 'updateLinks');
+      spyOn(this.regexper, 'displayWarnings');
 
       this.regexper.renderRegexp('example expression');
     });
@@ -440,6 +451,10 @@ describe('regexper.js', function() {
         expect(this.regexper.updateLinks).toHaveBeenCalled();
       });
 
+      it('displays the warnings', function() {
+        expect(this.regexper.displayWarnings).toHaveBeenCalled();
+      });
+
       it('tracks the complete render', function() {
         expect(this.regexper._trackEvent).toHaveBeenCalledWith('visualization', 'complete');
       });