(function (factory) {
  if (typeof define === 'function' && define.amd) {
    define(['jquery', 'sammy'], factory);
  } else {
    (window.Sammy = window.Sammy || {}).JSON = factory(window.jQuery, window.Sammy);
  }
}(function ($, Sammy) {

  // json2.js - only included if native json does not exist
  // http://www.json.org/js.html
  if (!window.JSON) {
    window.JSON = {};
  }
  (function () {

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

      if (typeof Date.prototype.toJSON !== 'function') {

          Date.prototype.toJSON = function (key) {

              return this.getUTCFullYear()   + '-' +
                   f(this.getUTCMonth() + 1) + '-' +
                   f(this.getUTCDate())      + 'T' +
                   f(this.getUTCHours())     + ':' +
                   f(this.getUTCMinutes())   + ':' +
                   f(this.getUTCSeconds())   + 'Z';
          };

          String.prototype.toJSON =
          Number.prototype.toJSON =
          Boolean.prototype.toJSON = function (key) {
              return this.valueOf();
          };
      }

      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 && typeof value === 'object' &&
                  typeof value.toJSON === 'function') {
              value = value.toJSON(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) {
                      k = rep[i];
                      if (typeof k === 'string') {
                          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.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.

      if (typeof JSON.stringify !== 'function') {
          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.

      if (typeof JSON.parse !== 'function') {
          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.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.

              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');
          };
      }
  }());

  // Sammy.JSON is a simple wrapper around Douglas Crockford's ever-useful json2.js
  // (http://www.json.org/js.html]) Sammy.JSON includes the top level JSON object if
  // it doesn't already exist (a.k.a. does not override the native implementation that
  // some browsers include). It also adds a <tt>json()</tt> helper to a Sammy app when
  // included.
  Sammy.JSON = function(app) {

    app.helpers({
      // json is a polymorphic function that translates objects aback and forth
      // from JSON to JS. If given a string, it will parse into JS, if given a JS
      // object it will stringify into JSON.
      //
      // ### Example
      //
      //      var app = $.sammy(function() {
      //        this.use(Sammy.JSON);
      //
      //        this.get('#/', function() {
      //          this.json({user_id: 123}); //=> "{\"user_id\":\"123\"}"
      //          this.json("{\"user_id\":\"123\"}"); //=> [object Object]
      //          this.json("{\"user_id\":\"123\"}").user_id; //=> "123"
      //        });
      //      })
      //
      //
      json: function(object) {
        if (typeof object == 'string') {
          return JSON.parse(object);
        } else {
          return JSON.stringify(object);
        }
      }
    });

  }

  return Sammy.JSON;

}));
