//  json2.js
//  2016-10-28
//  public domain.
//  no warranty expressed or implied. use at your own risk.
//  see http://www.json.org/js.html
//  this code should be minified before deployment.
//  see http://javascript.crockford.com/jsmin.html

//  use your own copy. it is extremely unwise to load code from servers you do
//  not control.

//  this file creates a global json object containing two methods: stringify
//  and parse. this file provides the es5 json capability to es3 systems.
//  if a project might run on ie8 or earlier, then this file should be included.
//  this file does nothing on es5 systems.

//      json.stringify(value, replacer, space)
//          value       any javascript value, usually an object or array.
//          replacer    an optional parameter that determines how object
//                      values are stringified for objects. it can be a
//                      function or an array of strings.
//          space       an optional parameter that specifies the indentation
//                      of nested structures. if it is omitted, the text will
//                      be packed without extra whitespace. if it is a number,
//                      it will specify the number of spaces to indent at each
//                      level. if it is a string (such as "\t" or " "),
//                      it contains the characters used to indent at each level.
//          this method produces a json text from a javascript value.
//          when an object value is found, if the object contains a tojson
//          method, its tojson method will be called and the result will be
//          stringified. a tojson method does not serialize: it returns the
//          value represented by the name/value pair that should be serialized,
//          or undefined if nothing should be serialized. the tojson method
//          will be passed the key associated with the value, and this will be
//          bound to the value.

//          for example, this would serialize dates as iso strings.

//              date.prototype.tojson = function (key) {
//                  function f(n) {
//                      // format integers to have at least two digits.
//                      return (n < 10)
//                          ? "0" + n
//                          : n;
//                  }
//                  return this.getutcfullyear()   + "-" +
//                       f(this.getutcmonth() + 1) + "-" +
//                       f(this.getutcdate())      + "t" +
//                       f(this.getutchours())     + ":" +
//                       f(this.getutcminutes())   + ":" +
//                       f(this.getutcseconds())   + "z";
//              };

//          you can provide an optional replacer method. it will be passed the
//          key and value of each member, with this bound to the containing
//          object. the value that is returned from your method will be
//          serialized. if your method returns undefined, then the member will
//          be excluded from the serialization.

//          if the replacer parameter is an array of strings, then it will be
//          used to select the members to be serialized. it filters the results
//          such that only members with keys listed in the replacer array are
//          stringified.

//          values that do not have json representations, such as undefined or
//          functions, will not be serialized. such values in objects will be
//          dropped; in arrays they will be replaced with null. you can use
//          a replacer function to replace those with json values.

//          json.stringify(undefined) returns undefined.

//          the optional space parameter produces a stringification of the
//          value that is filled with line breaks and indentation to make it
//          easier to read.

//          if the space parameter is a non-empty string, then that string will
//          be used for indentation. if the space parameter is a number, then
//          the indentation will be that many spaces.

//          example:

//          text = json.stringify(["e", {pluribus: "unum"}]);
//          // text is '["e",{"pluribus":"unum"}]'

//          text = json.stringify(["e", {pluribus: "unum"}], null, "\t");
//          // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'

//          text = json.stringify([new date()], function (key, value) {
//              return this[key] instanceof date
//                  ? "date(" + this[key] + ")"
//                  : value;
//          });
//          // text is '["date(---current time---)"]'

//      json.parse(text, reviver)
//          this method parses a json text to produce an object or array.
//          it can throw a syntaxerror exception.

//          the optional reviver parameter is a function that can filter and
//          transform the results. it receives each of the keys and values,
//          and its return value is used instead of the original value.
//          if it returns what it received, then the structure is not modified.
//          if it returns undefined then the member is deleted.

//          example:

//          // parse the text. values that look like iso date strings will
//          // be converted to date objects.

//          mydata = json.parse(text, function (key, value) {
//              var a;
//              if (typeof value === "string") {
//                  a =
//   /^(\d{4})-(\d{2})-(\d{2})t(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)z$/.exec(value);
//                  if (a) {
//                      return new date(date.utc(+a[1], +a[2] - 1, +a[3], +a[4],
//                          +a[5], +a[6]));
//                  }
//              }
//              return value;
//          });

//          mydata = json.parse('["date(09/09/2001)"]', function (key, value) {
//              var d;
//              if (typeof value === "string" &&
//                      value.slice(0, 5) === "date(" &&
//                      value.slice(-1) === ")") {
//                  d = new date(value.slice(5, -1));
//                  if (d) {
//                      return d;
//                  }
//              }
//              return value;
//          });

//  this is a reference implementation. you are free to copy, modify, or
//  redistribute.

/*jslint
    eval, for, this
*/

/*property
    json, apply, call, charcodeat, getutcdate, getutcfullyear, getutchours,
    getutcminutes, getutcmonth, getutcseconds, hasownproperty, join,
    lastindex, length, parse, prototype, push, replace, slice, stringify,
    test, tojson, tostring, valueof
*/


// create a json object only if one does not already exist. we create the
// methods in a closure to avoid creating global variables.

if (typeof json !== "object") {
    json = {};
}

(function () {
    "use strict";

    var rx_one = /^[\],:{}\s]*$/;
    var rx_two = /\\(?:["\\\/bfnrt]|u[0-9a-fa-f]{4})/g;
    var rx_three = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[ee][+\-]?\d+)?/g;
    var rx_four = /(?:^|:|,)(?:\s*\[)+/g;
    var rx_escapable = /[\\"\u0000-\u001f\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
    var rx_dangerous = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;

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

    function this_value() {
        return this.valueof();
    }

    if (typeof date.prototype.tojson !== "function") {

        date.prototype.tojson = function () {

            return isfinite(this.valueof())
                ? this.getutcfullyear() + "-" +
                        f(this.getutcmonth() + 1) + "-" +
                        f(this.getutcdate()) + "t" +
                        f(this.getutchours()) + ":" +
                        f(this.getutcminutes()) + ":" +
                        f(this.getutcseconds()) + "z"
                : null;
        };

        boolean.prototype.tojson = this_value;
        number.prototype.tojson = this_value;
        string.prototype.tojson = this_value;
    }

    var gap;
    var indent;
    var meta;
    var 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.

        rx_escapable.lastindex = 0;
        return rx_escapable.test(string)
            ? "\"" + string.replace(rx_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.
        var k;          // the member key.
        var v;          // the member value.
        var length;
        var mind = gap;
        var partial;
        var 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) {
                    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.

    if (typeof json.stringify !== "function") {
        meta = {    // table of character substitutions
            "\b": "\\b",
            "\t": "\\t",
            "\n": "\\n",
            "\f": "\\f",
            "\r": "\\r",
            "\"": "\\\"",
            "\\": "\\\\"
        };
        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;
                var v;
                var 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);
            rx_dangerous.lastindex = 0;
            if (rx_dangerous.test(text)) {
                text = text.replace(rx_dangerous, 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 (
                rx_one.test(
                    text
                        .replace(rx_two, "@")
                        .replace(rx_three, "]")
                        .replace(rx_four, "")
                )
            ) {

// 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");
        };
    }
}());