Adding tests for CharsetEscape nodes

spec/parser/javascript/charset_escape_spec.js

@@ -0,0 +1,35 @@
+import javascript from 'src/js/parser/javascript/parser.js';
+import _ from 'lodash';
+import Snap from 'snapsvg';
+
+describe('parser/javascript/any_character.js', function() {
+
+  _.forIn({
+    '\\b': 'backspace',
+    '\\d': 'digit',
+    '\\D': 'non-digit',
+    '\\f': 'form feed',
+    '\\n': 'line feed',
+    '\\r': 'carriage return',
+    '\\s': 'white space',
+    '\\S': 'non-white space',
+    '\\t': 'tab',
+    '\\v': 'vertical tab',
+    '\\w': 'word',
+    '\\W': 'non-word',
+    '\\0': 'null',
+    '\\012': 'octal: 12',
+    '\\cx': 'ctrl-x',
+    '\\xab': '0xAB',
+    '\\uabcd': 'U+ABCD'
+  }, (label, str) => {
+    it(`parses "${str}" as a CharsetEscape`, function() {
+      var parser = new javascript.Parser(str);
+      expect(parser.__consume__charset_terminal()).toEqual(jasmine.objectContaining({
+        type: 'charset-escape',
+        label
+      }));
+    });
+  });
+
+});

src/js/parser/javascript/grammar.peg

@@ -22,9 +22,11 @@ grammar JavascriptRegexp
                     / charset_literal <Literal>
   charset_escape <- "\\" esc:(
          code:[bdDfnrsStvwW] arg:""?
+       / code:"c" arg:.
        / code:"0" arg:[0-7]+
        / code:"x" arg:( [0-9a-fA-F] [0-9a-fA-F] )
-       / code:"u" arg:( [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] ) )
+       / code:"u" arg:( [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] )
+       / code:"0" arg:""? )
   charset_literal <- ( ""? literal:[^\\\]] ) / ( "\\" literal:. )
   terminal <- "." <AnyCharacter>
             / escape <Escape>