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(function (global, module) {

  if ('undefined' == typeof module) {
    var module = { exports: {} }
        , exports = module.exports
  }

  /**
   * Exports.
   */

  module.exports = expect;
  expect.Assertion = Assertion;

  /**
   * Exports version.
   */

  expect.version = '0.1.2';

  /**
   * Possible assertion flags.
   */

  var flags = {
    not: ['to', 'be', 'have', 'include', 'only']
    , to: ['be', 'have', 'include', 'only', 'not']
    , only: ['have']
    , have: ['own']
    , be: ['an']
  };

  function expect (obj) {
    return new Assertion(obj);
  }

  /**
   * Constructor
   *
   * @api private
   */

  function Assertion (obj, flag, parent) {
    this.obj = obj;
    this.flags = {};

    if (undefined != parent) {
      this.flags[flag] = true;

      for (var i in parent.flags) {
        if (parent.flags.hasOwnProperty(i)) {
          this.flags[i] = true;
        }
      }
    }

    var $flags = flag ? flags[flag] : keys(flags)
        , self = this

    if ($flags) {
      for (var i = 0, l = $flags.length; i < l; i++) {
        // avoid recursion
        if (this.flags[$flags[i]]) continue;

        var name = $flags[i]
            , assertion = new Assertion(this.obj, name, this)

        if ('function' == typeof Assertion.prototype[name]) {
          // clone the function, make sure we dont touch the prot reference
          var old = this[name];
          this[name] = function () {
            return old.apply(self, arguments);
          }

          for (var fn in Assertion.prototype) {
            if (Assertion.prototype.hasOwnProperty(fn) && fn != name) {
              this[name][fn] = bind(assertion[fn], assertion);
            }
          }
        } else {
          this[name] = assertion;
        }
      }
    }
  };

  /**
   * Performs an assertion
   *
   * @api private
   */

  Assertion.prototype.assert = function (truth, msg, error) {
    var msg = this.flags.not ? error : msg
        , ok = this.flags.not ? !truth : truth;

    if (!ok) {
      throw new Error(msg.call(this));
    }

    this.and = new Assertion(this.obj);
  };

  /**
   * Check if the value is truthy
   *
   * @api public
   */

  Assertion.prototype.ok = function () {
    this.assert(
        !!this.obj
        , function(){ return 'expected ' + i(this.obj) + ' to be truthy' }
        , function(){ return 'expected ' + i(this.obj) + ' to be falsy' });
  };

  /**
   * Assert that the function throws.
   *
   * @param {Function|RegExp} callback, or regexp to match error string against
   * @api public
   */

  Assertion.prototype.throwError =
      Assertion.prototype.throwException = function (fn) {
        expect(this.obj).to.be.a('function');

        var thrown = false
            , not = this.flags.not

        try {
          this.obj();
        } catch (e) {
          if ('function' == typeof fn) {
            fn(e);
          } else if ('object' == typeof fn) {
            var subject = 'string' == typeof e ? e : e.message;
            if (not) {
              expect(subject).to.not.match(fn);
            } else {
              expect(subject).to.match(fn);
            }
          }
          thrown = true;
        }

        if ('object' == typeof fn && not) {
          // in the presence of a matcher, ensure the `not` only applies to
          // the matching.
          this.flags.not = false;
        }

        var name = this.obj.name || 'fn';
        this.assert(
            thrown
            , function(){ return 'expected ' + name + ' to throw an exception' }
            , function(){ return 'expected ' + name + ' not to throw an exception' });
      };

  /**
   * Checks if the array is empty.
   *
   * @api public
   */

  Assertion.prototype.empty = function () {
    var expectation;

    if ('object' == typeof this.obj && null !== this.obj && !isArray(this.obj)) {
      if ('number' == typeof this.obj.length) {
        expectation = !this.obj.length;
      } else {
        expectation = !keys(this.obj).length;
      }
    } else {
      if ('string' != typeof this.obj) {
        expect(this.obj).to.be.an('object');
      }

      expect(this.obj).to.have.property('length');
      expectation = !this.obj.length;
    }

    this.assert(
        expectation
        , function(){ return 'expected ' + i(this.obj) + ' to be empty' }
        , function(){ return 'expected ' + i(this.obj) + ' to not be empty' });
    return this;
  };

  /**
   * Checks if the obj exactly equals another.
   *
   * @api public
   */

  Assertion.prototype.be =
      Assertion.prototype.equal = function (obj) {
        this.assert(
            obj === this.obj
            , function(){ return 'expected ' + i(this.obj) + ' to equal ' + i(obj) }
            , function(){ return 'expected ' + i(this.obj) + ' to not equal ' + i(obj) });
        return this;
      };

  /**
   * Checks if the obj sortof equals another.
   *
   * @api public
   */

  Assertion.prototype.eql = function (obj) {
    this.assert(
        expect.eql(obj, this.obj)
        , function(){ return 'expected ' + i(this.obj) + ' to sort of equal ' + i(obj) }
        , function(){ return 'expected ' + i(this.obj) + ' to sort of not equal ' + i(obj) });
    return this;
  };

  /**
   * Assert within start to finish (inclusive).
   *
   * @param {Number} start
   * @param {Number} finish
   * @api public
   */

  Assertion.prototype.within = function (start, finish) {
    var range = start + '..' + finish;
    this.assert(
        this.obj >= start && this.obj <= finish
        , function(){ return 'expected ' + i(this.obj) + ' to be within ' + range }
        , function(){ return 'expected ' + i(this.obj) + ' to not be within ' + range });
    return this;
  };

  /**
   * Assert typeof / instance of
   *
   * @api public
   */

  Assertion.prototype.a =
      Assertion.prototype.an = function (type) {
        if ('string' == typeof type) {
          // proper english in error msg
          var n = /^[aeiou]/.test(type) ? 'n' : '';

          // typeof with support for 'array'
          this.assert(
              'array' == type ? isArray(this.obj) :
                  'object' == type
                      ? 'object' == typeof this.obj && null !== this.obj
                      : type == typeof this.obj
              , function(){ return 'expected ' + i(this.obj) + ' to be a' + n + ' ' + type }
              , function(){ return 'expected ' + i(this.obj) + ' not to be a' + n + ' ' + type });
        } else {
          // instanceof
          var name = type.name || 'supplied constructor';
          this.assert(
              this.obj instanceof type
              , function(){ return 'expected ' + i(this.obj) + ' to be an instance of ' + name }
              , function(){ return 'expected ' + i(this.obj) + ' not to be an instance of ' + name });
        }

        return this;
      };

  /**
   * Assert numeric value above _n_.
   *
   * @param {Number} n
   * @api public
   */

  Assertion.prototype.greaterThan =
      Assertion.prototype.above = function (n) {
        this.assert(
            this.obj > n
            , function(){ return 'expected ' + i(this.obj) + ' to be above ' + n }
            , function(){ return 'expected ' + i(this.obj) + ' to be below ' + n });
        return this;
      };

  /**
   * Assert numeric value below _n_.
   *
   * @param {Number} n
   * @api public
   */

  Assertion.prototype.lessThan =
      Assertion.prototype.below = function (n) {
        this.assert(
            this.obj < n
            , function(){ return 'expected ' + i(this.obj) + ' to be below ' + n }
            , function(){ return 'expected ' + i(this.obj) + ' to be above ' + n });
        return this;
      };

  /**
   * Assert string value matches _regexp_.
   *
   * @param {RegExp} regexp
   * @api public
   */

  Assertion.prototype.match = function (regexp) {
    this.assert(
        regexp.exec(this.obj)
        , function(){ return 'expected ' + i(this.obj) + ' to match ' + regexp }
        , function(){ return 'expected ' + i(this.obj) + ' not to match ' + regexp });
    return this;
  };

  /**
   * Assert property "length" exists and has value of _n_.
   *
   * @param {Number} n
   * @api public
   */

  Assertion.prototype.length = function (n) {
    expect(this.obj).to.have.property('length');
    var len = this.obj.length;
    this.assert(
        n == len
        , function(){ return 'expected ' + i(this.obj) + ' to have a length of ' + n + ' but got ' + len }
        , function(){ return 'expected ' + i(this.obj) + ' to not have a length of ' + len });
    return this;
  };

  /**
   * Assert property _name_ exists, with optional _val_.
   *
   * @param {String} name
   * @param {Mixed} val
   * @api public
   */

  Assertion.prototype.property = function (name, val) {
    if (this.flags.own) {
      this.assert(
          Object.prototype.hasOwnProperty.call(this.obj, name)
          , function(){ return 'expected ' + i(this.obj) + ' to have own property ' + i(name) }
          , function(){ return 'expected ' + i(this.obj) + ' to not have own property ' + i(name) });
      return this;
    }

    if (this.flags.not && undefined !== val) {
      if (undefined === this.obj[name]) {
        throw new Error(i(this.obj) + ' has no property ' + i(name));
      }
    } else {
      var hasProp;
      try {
        hasProp = name in this.obj
      } catch (e) {
        hasProp = undefined !== this.obj[name]
      }

      this.assert(
          hasProp
          , function(){ return 'expected ' + i(this.obj) + ' to have a property ' + i(name) }
          , function(){ return 'expected ' + i(this.obj) + ' to not have a property ' + i(name) });
    }

    if (undefined !== val) {
      this.assert(
          val === this.obj[name]
          , function(){ return 'expected ' + i(this.obj) + ' to have a property ' + i(name)
              + ' of ' + i(val) + ', but got ' + i(this.obj[name]) }
          , function(){ return 'expected ' + i(this.obj) + ' to not have a property ' + i(name)
              + ' of ' + i(val) });
    }

    this.obj = this.obj[name];
    return this;
  };

  /**
   * Assert that the array contains _obj_ or string contains _obj_.
   *
   * @param {Mixed} obj|string
   * @api public
   */

  Assertion.prototype.string =
      Assertion.prototype.contain = function (obj) {
        if ('string' == typeof this.obj) {
          this.assert(
              ~this.obj.indexOf(obj)
              , function(){ return 'expected ' + i(this.obj) + ' to contain ' + i(obj) }
              , function(){ return 'expected ' + i(this.obj) + ' to not contain ' + i(obj) });
        } else {
          this.assert(
              ~indexOf(this.obj, obj)
              , function(){ return 'expected ' + i(this.obj) + ' to contain ' + i(obj) }
              , function(){ return 'expected ' + i(this.obj) + ' to not contain ' + i(obj) });
        }
        return this;
      };

  /**
   * Assert exact keys or inclusion of keys by using
   * the `.own` modifier.
   *
   * @param {Array|String ...} keys
   * @api public
   */

  Assertion.prototype.key =
      Assertion.prototype.keys = function ($keys) {
        var str
            , ok = true;

        $keys = isArray($keys)
            ? $keys
            : Array.prototype.slice.call(arguments);

        if (!$keys.length) throw new Error('keys required');

        var actual = keys(this.obj)
            , len = $keys.length;

        // Inclusion
        ok = every($keys, function (key) {
          return ~indexOf(actual, key);
        });

        // Strict
        if (!this.flags.not && this.flags.only) {
          ok = ok && $keys.length == actual.length;
        }

        // Key string
        if (len > 1) {
          $keys = map($keys, function (key) {
            return i(key);
          });
          var last = $keys.pop();
          str = $keys.join(', ') + ', and ' + last;
        } else {
          str = i($keys[0]);
        }

        // Form
        str = (len > 1 ? 'keys ' : 'key ') + str;

        // Have / include
        str = (!this.flags.only ? 'include ' : 'only have ') + str;

        // Assertion
        this.assert(
            ok
            , function(){ return 'expected ' + i(this.obj) + ' to ' + str }
            , function(){ return 'expected ' + i(this.obj) + ' to not ' + str });

        return this;
      };
  /**
   * Assert a failure.
   *
   * @param {String ...} custom message
   * @api public
   */
  Assertion.prototype.fail = function (msg) {
    msg = msg || "explicit failure";
    this.assert(false, msg, msg);
    return this;
  };

  /**
   * Function bind implementation.
   */

  function bind (fn, scope) {
    return function () {
      return fn.apply(scope, arguments);
    }
  }

  /**
   * Array every compatibility
   *
   * @see bit.ly/5Fq1N2
   * @api public
   */

  function every (arr, fn, thisObj) {
    var scope = thisObj || global;
    for (var i = 0, j = arr.length; i < j; ++i) {
      if (!fn.call(scope, arr[i], i, arr)) {
        return false;
      }
    }
    return true;
  };

  /**
   * Array indexOf compatibility.
   *
   * @see bit.ly/a5Dxa2
   * @api public
   */

  function indexOf (arr, o, i) {
    if (Array.prototype.indexOf) {
      return Array.prototype.indexOf.call(arr, o, i);
    }

    if (arr.length === undefined) {
      return -1;
    }

    for (var j = arr.length, i = i < 0 ? i + j < 0 ? 0 : i + j : i || 0
        ; i < j && arr[i] !== o; i++);

    return j <= i ? -1 : i;
  };

  // https://gist.github.com/1044128/
  var getOuterHTML = function(element) {
    if ('outerHTML' in element) return element.outerHTML;
    var ns = "http://www.w3.org/1999/xhtml";
    var container = document.createElementNS(ns, '_');
    var elemProto = (window.HTMLElement || window.Element).prototype;
    var xmlSerializer = new XMLSerializer();
    var html;
    if (document.xmlVersion) {
      return xmlSerializer.serializeToString(element);
    } else {
      container.appendChild(element.cloneNode(false));
      html = container.innerHTML.replace('><', '>' + element.innerHTML + '<');
      container.innerHTML = '';
      return html;
    }
  };

  // Returns true if object is a DOM element.
  var isDOMElement = function (object) {
    if (typeof HTMLElement === 'object') {
      return object instanceof HTMLElement;
    } else {
      return object &&
          typeof object === 'object' &&
          object.nodeType === 1 &&
          typeof object.nodeName === 'string';
    }
  };

  /**
   * Inspects an object.
   *
   * @see taken from node.js `util` module (copyright Joyent, MIT license)
   * @api private
   */

  function i (obj, showHidden, depth) {
    var seen = [];

    function stylize (str) {
      return str;
    };

    function format (value, recurseTimes) {
      // Provide a hook for user-specified inspect functions.
      // Check that value is an object with an inspect function on it
      if (value && typeof value.inspect === 'function' &&
        // Filter out the util module, it's inspect function is special
          value !== exports &&
        // Also filter out any prototype objects using the circular check.
          !(value.constructor && value.constructor.prototype === value)) {
        return value.inspect(recurseTimes);
      }

      // Primitive types cannot have properties
      switch (typeof value) {
        case 'undefined':
          return stylize('undefined', 'undefined');

        case 'string':
          var simple = '\'' + json.stringify(value).replace(/^"|"$/g, '')
              .replace(/'/g, "\\'")
              .replace(/\\"/g, '"') + '\'';
          return stylize(simple, 'string');

        case 'number':
          return stylize('' + value, 'number');

        case 'boolean':
          return stylize('' + value, 'boolean');
      }
      // For some reason typeof null is "object", so special case here.
      if (value === null) {
        return stylize('null', 'null');
      }

      if (isDOMElement(value)) {
        return getOuterHTML(value);
      }

      // Look up the keys of the object.
      var visible_keys = keys(value);
      var $keys = showHidden ? Object.getOwnPropertyNames(value) : visible_keys;

      // Functions without properties can be shortcutted.
      if (typeof value === 'function' && $keys.length === 0) {
        if (isRegExp(value)) {
          return stylize('' + value, 'regexp');
        } else {
          var name = value.name ? ': ' + value.name : '';
          return stylize('[Function' + name + ']', 'special');
        }
      }

      // Dates without properties can be shortcutted
      if (isDate(value) && $keys.length === 0) {
        return stylize(value.toUTCString(), 'date');
      }

      var base, type, braces;
      // Determine the object type
      if (isArray(value)) {
        type = 'Array';
        braces = ['[', ']'];
      } else {
        type = 'Object';
        braces = ['{', '}'];
      }

      // Make functions say that they are functions
      if (typeof value === 'function') {
        var n = value.name ? ': ' + value.name : '';
        base = (isRegExp(value)) ? ' ' + value : ' [Function' + n + ']';
      } else {
        base = '';
      }

      // Make dates with properties first say the date
      if (isDate(value)) {
        base = ' ' + value.toUTCString();
      }

      if ($keys.length === 0) {
        return braces[0] + base + braces[1];
      }

      if (recurseTimes < 0) {
        if (isRegExp(value)) {
          return stylize('' + value, 'regexp');
        } else {
          return stylize('[Object]', 'special');
        }
      }

      seen.push(value);

      var output = map($keys, function (key) {
        var name, str;
        if (value.__lookupGetter__) {
          if (value.__lookupGetter__(key)) {
            if (value.__lookupSetter__(key)) {
              str = stylize('[Getter/Setter]', 'special');
            } else {
              str = stylize('[Getter]', 'special');
            }
          } else {
            if (value.__lookupSetter__(key)) {
              str = stylize('[Setter]', 'special');
            }
          }
        }
        if (indexOf(visible_keys, key) < 0) {
          name = '[' + key + ']';
        }
        if (!str) {
          if (indexOf(seen, value[key]) < 0) {
            if (recurseTimes === null) {
              str = format(value[key]);
            } else {
              str = format(value[key], recurseTimes - 1);
            }
            if (str.indexOf('\n') > -1) {
              if (isArray(value)) {
                str = map(str.split('\n'), function (line) {
                  return '  ' + line;
                }).join('\n').substr(2);
              } else {
                str = '\n' + map(str.split('\n'), function (line) {
                  return '   ' + line;
                }).join('\n');
              }
            }
          } else {
            str = stylize('[Circular]', 'special');
          }
        }
        if (typeof name === 'undefined') {
          if (type === 'Array' && key.match(/^\d+$/)) {
            return str;
          }
          name = json.stringify('' + key);
          if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
            name = name.substr(1, name.length - 2);
            name = stylize(name, 'name');
          } else {
            name = name.replace(/'/g, "\\'")
                .replace(/\\"/g, '"')
                .replace(/(^"|"$)/g, "'");
            name = stylize(name, 'string');
          }
        }

        return name + ': ' + str;
      });

      seen.pop();

      var numLinesEst = 0;
      var length = reduce(output, function (prev, cur) {
        numLinesEst++;
        if (indexOf(cur, '\n') >= 0) numLinesEst++;
        return prev + cur.length + 1;
      }, 0);

      if (length > 50) {
        output = braces[0] +
            (base === '' ? '' : base + '\n ') +
            ' ' +
            output.join(',\n  ') +
            ' ' +
            braces[1];

      } else {
        output = braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
      }

      return output;
    }
    return format(obj, (typeof depth === 'undefined' ? 2 : depth));
  };

  function isArray (ar) {
    return Object.prototype.toString.call(ar) == '[object Array]';
  };

  function isRegExp(re) {
    var s;
    try {
      s = '' + re;
    } catch (e) {
      return false;
    }

    return re instanceof RegExp || // easy case
      // duck-type for context-switching evalcx case
        typeof(re) === 'function' &&
            re.constructor.name === 'RegExp' &&
            re.compile &&
            re.test &&
            re.exec &&
            s.match(/^\/.*\/[gim]{0,3}$/);
  };

  function isDate(d) {
    if (d instanceof Date) return true;
    return false;
  };

  function keys (obj) {
    if (Object.keys) {
      return Object.keys(obj);
    }

    var keys = [];

    for (var i in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, i)) {
        keys.push(i);
      }
    }

    return keys;
  }

  function map (arr, mapper, that) {
    if (Array.prototype.map) {
      return Array.prototype.map.call(arr, mapper, that);
    }

    var other= new Array(arr.length);

    for (var i= 0, n = arr.length; i<n; i++)
      if (i in arr)
        other[i] = mapper.call(that, arr[i], i, arr);

    return other;
  };

  function reduce (arr, fun) {
    if (Array.prototype.reduce) {
      return Array.prototype.reduce.apply(
          arr
          , Array.prototype.slice.call(arguments, 1)
      );
    }

    var len = +this.length;

    if (typeof fun !== "function")
      throw new TypeError();

    // no value to return if no initial value and an empty array
    if (len === 0 && arguments.length === 1)
      throw new TypeError();

    var i = 0;
    if (arguments.length >= 2) {
      var rv = arguments[1];
    } else {
      do {
        if (i in this) {
          rv = this[i++];
          break;
        }

        // if array contains no values, no initial value to return
        if (++i >= len)
          throw new TypeError();
      } while (true);
    }

    for (; i < len; i++) {
      if (i in this)
        rv = fun.call(null, rv, this[i], i, this);
    }

    return rv;
  };

  /**
   * Asserts deep equality
   *
   * @see taken from node.js `assert` module (copyright Joyent, MIT license)
   * @api private
   */

  expect.eql = function eql (actual, expected) {
    // 7.1. All identical values are equivalent, as determined by ===.
    if (actual === expected) {
      return true;
    } else if ('undefined' != typeof Buffer
        && Buffer.isBuffer(actual) && Buffer.isBuffer(expected)) {
      if (actual.length != expected.length) return false;

      for (var i = 0; i < actual.length; i++) {
        if (actual[i] !== expected[i]) return false;
      }

      return true;

      // 7.2. If the expected value is a Date object, the actual value is
      // equivalent if it is also a Date object that refers to the same time.
    } else if (actual instanceof Date && expected instanceof Date) {
      return actual.getTime() === expected.getTime();

      // 7.3. Other pairs that do not both pass typeof value == "object",
      // equivalence is determined by ==.
    } else if (typeof actual != 'object' && typeof expected != 'object') {
      return actual == expected;

      // 7.4. For all other Object pairs, including Array objects, equivalence is
      // determined by having the same number of owned properties (as verified
      // with Object.prototype.hasOwnProperty.call), the same set of keys
      // (although not necessarily the same order), equivalent values for every
      // corresponding key, and an identical "prototype" property. Note: this
      // accounts for both named and indexed properties on Arrays.
    } else {
      return objEquiv(actual, expected);
    }
  }

  function isUndefinedOrNull (value) {
    return value === null || value === undefined;
  }

  function isArguments (object) {
    return Object.prototype.toString.call(object) == '[object Arguments]';
  }

  function objEquiv (a, b) {
    if (isUndefinedOrNull(a) || isUndefinedOrNull(b))
      return false;
    // an identical "prototype" property.
    if (a.prototype !== b.prototype) return false;
    //~~~I've managed to break Object.keys through screwy arguments passing.
    //   Converting to array solves the problem.
    if (isArguments(a)) {
      if (!isArguments(b)) {
        return false;
      }
      a = pSlice.call(a);
      b = pSlice.call(b);
      return expect.eql(a, b);
    }
    try{
      var ka = keys(a),
          kb = keys(b),
          key, i;
    } catch (e) {//happens when one is a string literal and the other isn't
      return false;
    }
    // having the same number of owned properties (keys incorporates hasOwnProperty)
    if (ka.length != kb.length)
      return false;
    //the same set of keys (although not necessarily the same order),
    ka.sort();
    kb.sort();
    //~~~cheap key test
    for (i = ka.length - 1; i >= 0; i--) {
      if (ka[i] != kb[i])
        return false;
    }
    //equivalent values for every corresponding key, and
    //~~~possibly expensive deep test
    for (i = ka.length - 1; i >= 0; i--) {
      key = ka[i];
      if (!expect.eql(a[key], b[key]))
        return false;
    }
    return true;
  }

  var json = (function () {
    "use strict";

    if ('object' == typeof JSON && JSON.parse && JSON.stringify) {
      return {
        parse: nativeJSON.parse
        , stringify: nativeJSON.stringify
      }
    }

    var JSON = {};

    function f(n) {
      // Format integers to have at least two digits.
      return n < 10 ? '0' + n : n;
    }

    function date(d, key) {
      return isFinite(d.valueOf()) ?
          d.getUTCFullYear()     + '-' +
              f(d.getUTCMonth() + 1) + '-' +
              f(d.getUTCDate())      + 'T' +
              f(d.getUTCHours())     + ':' +
              f(d.getUTCMinutes())   + ':' +
              f(d.getUTCSeconds())   + 'Z' : null;
    };

    var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
        escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
        gap,
        indent,
        meta = {    // table of character substitutions
          '\b': '\\b',
          '\t': '\\t',
          '\n': '\\n',
          '\f': '\\f',
          '\r': '\\r',
          '"' : '\\"',
          '\\': '\\\\'
        },
        rep;


    function quote(string) {

      // If the string contains no control characters, no quote characters, and no
      // backslash characters, then we can safely slap some quotes around it.
      // Otherwise we must also replace the offending characters with safe escape
      // sequences.

      escapable.lastIndex = 0;
      return escapable.test(string) ? '"' + string.replace(escapable, function (a) {
        var c = meta[a];
        return typeof c === 'string' ? c :
            '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
      }) + '"' : '"' + string + '"';
    }


    function str(key, holder) {

      // Produce a string from holder[key].

      var i,          // The loop counter.
          k,          // The member key.
          v,          // The member value.
          length,
          mind = gap,
          partial,
          value = holder[key];

      // If the value has a toJSON method, call it to obtain a replacement value.

      if (value instanceof Date) {
        value = date(key);
      }

      // If we were called with a replacer function, then call the replacer to
      // obtain a replacement value.

      if (typeof rep === 'function') {
        value = rep.call(holder, key, value);
      }

      // What happens next depends on the value's type.

      switch (typeof value) {
        case 'string':
          return quote(value);

        case 'number':

          // JSON numbers must be finite. Encode non-finite numbers as null.

          return isFinite(value) ? String(value) : 'null';

        case 'boolean':
        case 'null':

          // If the value is a boolean or null, convert it to a string. Note:
          // typeof null does not produce 'null'. The case is included here in
          // the remote chance that this gets fixed someday.

          return String(value);

        // If the type is 'object', we might be dealing with an object or an array or
        // null.

        case 'object':

          // Due to a specification blunder in ECMAScript, typeof null is 'object',
          // so watch out for that case.

          if (!value) {
            return 'null';
          }

          // Make an array to hold the partial results of stringifying this object value.

          gap += indent;
          partial = [];

          // Is the value an array?

          if (Object.prototype.toString.apply(value) === '[object Array]') {

            // The value is an array. Stringify every element. Use null as a placeholder
            // for non-JSON values.

            length = value.length;
            for (i = 0; i < length; i += 1) {
              partial[i] = str(i, value) || 'null';
            }

            // Join all of the elements together, separated with commas, and wrap them in
            // brackets.

            v = partial.length === 0 ? '[]' : gap ?
                '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']' :
                '[' + partial.join(',') + ']';
            gap = mind;
            return v;
          }

          // If the replacer is an array, use it to select the members to be stringified.

          if (rep && typeof rep === 'object') {
            length = rep.length;
            for (i = 0; i < length; i += 1) {
              if (typeof rep[i] === 'string') {
                k = rep[i];
                v = str(k, value);
                if (v) {
                  partial.push(quote(k) + (gap ? ': ' : ':') + v);
                }
              }
            }
          } else {

            // Otherwise, iterate through all of the keys in the object.

            for (k in value) {
              if (Object.prototype.hasOwnProperty.call(value, k)) {
                v = str(k, value);
                if (v) {
                  partial.push(quote(k) + (gap ? ': ' : ':') + v);
                }
              }
            }
          }

          // Join all of the member texts together, separated with commas,
          // and wrap them in braces.

          v = partial.length === 0 ? '{}' : gap ?
              '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}' :
              '{' + partial.join(',') + '}';
          gap = mind;
          return v;
      }
    }

    // If the JSON object does not yet have a stringify method, give it one.

    JSON.stringify = function (value, replacer, space) {

      // The stringify method takes a value and an optional replacer, and an optional
      // space parameter, and returns a JSON text. The replacer can be a function
      // that can replace values, or an array of strings that will select the keys.
      // A default replacer method can be provided. Use of the space parameter can
      // produce text that is more easily readable.

      var i;
      gap = '';
      indent = '';

      // If the space parameter is a number, make an indent string containing that
      // many spaces.

      if (typeof space === 'number') {
        for (i = 0; i < space; i += 1) {
          indent += ' ';
        }

        // If the space parameter is a string, it will be used as the indent string.

      } else if (typeof space === 'string') {
        indent = space;
      }

      // If there is a replacer, it must be a function or an array.
      // Otherwise, throw an error.

      rep = replacer;
      if (replacer && typeof replacer !== 'function' &&
          (typeof replacer !== 'object' ||
              typeof replacer.length !== 'number')) {
        throw new Error('JSON.stringify');
      }

      // Make a fake root object containing our value under the key of ''.
      // Return the result of stringifying the value.

      return str('', {'': value});
    };

    // If the JSON object does not yet have a parse method, give it one.

    JSON.parse = function (text, reviver) {
      // The parse method takes a text and an optional reviver function, and returns
      // a JavaScript value if the text is a valid JSON text.

      var j;

      function walk(holder, key) {

        // The walk method is used to recursively walk the resulting structure so
        // that modifications can be made.

        var k, v, value = holder[key];
        if (value && typeof value === 'object') {
          for (k in value) {
            if (Object.prototype.hasOwnProperty.call(value, k)) {
              v = walk(value, k);
              if (v !== undefined) {
                value[k] = v;
              } else {
                delete value[k];
              }
            }
          }
        }
        return reviver.call(holder, key, value);
      }


      // Parsing happens in four stages. In the first stage, we replace certain
      // Unicode characters with escape sequences. JavaScript handles many characters
      // incorrectly, either silently deleting them, or treating them as line endings.

      text = String(text);
      cx.lastIndex = 0;
      if (cx.test(text)) {
        text = text.replace(cx, function (a) {
          return '\\u' +
              ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
        });
      }

      // In the second stage, we run the text against regular expressions that look
      // for non-JSON patterns. We are especially concerned with '()' and 'new'
      // because they can cause invocation, and '=' because it can cause mutation.
      // But just to be safe, we want to reject all unexpected forms.

      // We split the second stage into 4 regexp operations in order to work around
      // crippling inefficiencies in IE's and Safari's regexp engines. First we
      // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
      // replace all simple value tokens with ']' characters. Third, we delete all
      // open brackets that follow a colon or comma or that begin the text. Finally,
      // we look to see that the remaining characters are only whitespace or ']' or
      // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.

      if (/^[\],:{}\s]*$/
          .test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@')
              .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']')
              .replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {

        // In the third stage we use the eval function to compile the text into a
        // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
        // in JavaScript: it can begin a block or an object literal. We wrap the text
        // in parens to eliminate the ambiguity.

        j = eval('(' + text + ')');

        // In the optional fourth stage, we recursively walk the new structure, passing
        // each name/value pair to a reviver function for possible transformation.

        return typeof reviver === 'function' ?
            walk({'': j}, '') : j;
      }

      // If the text is not JSON parseable, then a SyntaxError is thrown.

      throw new SyntaxError('JSON.parse');
    };

    return JSON;
  })();

  if ('undefined' != typeof window) {
    window.expect = module.exports;
  }

})(
        this
        , 'undefined' != typeof module ? module : {}
        , 'undefined' != typeof exports ? exports : {}
    );
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