# Code coverage report for lib/json3.js

## Statements: 13.77% (50 / 363) Branches: 15.32% (59 / 385) Functions: 11.54% (3 / 26) Lines: 13.77% (50 / 363)

All files » lib/ » json3.js

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     /*! JSON v3.2.5 | http://bestiejs.github.io/json3 | Copyright 2012-2013, Kit Cambridge | http://kit.mit-license.org */
    ;(function (window) {
      // Convenience aliases.
      var getClass = {}.toString, isProperty, forEach, undef;

      // Detect the `define` function exposed by asynchronous module loaders. The
      // strict `define` check is necessary for compatibility with `r.js`.
      var isLoader = typeof define === "function" && define.amd;

      // Detect native implementations.
      var nativeJSON = typeof JSON == "object" && JSON;

      // Set up the JSON 3 namespace, preferring the CommonJS `exports` object if
      // available.
      var JSON3 = typeof exports == "object" && exports && !exports.nodeType && exports;

      Eif (JSON3 && nativeJSON) {
        // Explicitly delegate to the native `stringify` and `parse`
        // implementations in CommonJS environments.
        JSON3.stringify = nativeJSON.stringify;
        JSON3.parse = nativeJSON.parse;
      } else {
        // Export for web browsers, JavaScript engines, and asynchronous module
        // loaders, using the global `JSON` object if available.
        JSON3 = window.JSON = nativeJSON || {};
      }

      // Test the `Date#getUTC*` methods. Based on work by @Yaffle.
      var isExtended = new Date(-3509827334573292);
      try {
        // The `getUTCFullYear`, `Month`, and `Date` methods return nonsensical
        // results for certain dates in Opera >= 10.53.
        isExtended = isExtended.getUTCFullYear() == -109252 && isExtended.getUTCMonth() === 0 && isExtended.getUTCDate() === 1 &&
          // Safari < 2.0.2 stores the internal millisecond time value correctly,
          // but clips the values returned by the date methods to the range of
          // signed 32-bit integers ([-2 ** 31, 2 ** 31 - 1]).
          isExtended.getUTCHours() == 10 && isExtended.getUTCMinutes() == 37 && isExtended.getUTCSeconds() == 6 && isExtended.getUTCMilliseconds() == 708;
      } catch (exception) {}

      // Internal: Determines whether the native `JSON.stringify` and `parse`
      // implementations are spec-compliant. Based on work by Ken Snyder.
      function has(name) {
        Iif (has[name] != null) {
          // Return cached feature test result.
          return has[name];
        }

        var isSupported;
        Iif (name == "bug-string-char-index") {
          // IE <= 7 doesn't support accessing string characters using square
          // bracket notation. IE 8 only supports this for primitives.
          isSupported = "a"[0] != "a";
        } else if (name == "json") {
          // Indicates whether both `JSON.stringify` and `JSON.parse` are
          // supported.
          isSupported = has("json-stringify") && has("json-parse");
        } else {
          var value, serialized = '{"a":[1,true,false,null,"\\u0000\\b\\n\\f\\r\\t"]}';
          // Test `JSON.stringify`.
          if (name == "json-stringify") {
            var stringify = JSON3.stringify, stringifySupported = typeof stringify == "function" && isExtended;
            Eif (stringifySupported) {
              // A test function object with a custom `toJSON` method.
              (value = function () {
                return 1;
              }).toJSON = value;
              try {
                stringifySupported =
                  // Firefox 3.1b1 and b2 serialize string, number, and boolean
                  // primitives as object literals.
                  stringify(0) === "0" &&
                  // FF 3.1b1, b2, and JSON 2 serialize wrapped primitives as object
                  // literals.
                  stringify(new Number()) === "0" &&
                  stringify(new String()) == '""' &&
                  // FF 3.1b1, 2 throw an error if the value is `null`, `undefined`, or
                  // does not define a canonical JSON representation (this applies to
                  // objects with `toJSON` properties as well, *unless* they are nested
                  // within an object or array).
                  stringify(getClass) === undef &&
                  // IE 8 serializes `undefined` as `"undefined"`. Safari <= 5.1.7 and
                  // FF 3.1b3 pass this test.
                  stringify(undef) === undef &&
                  // Safari <= 5.1.7 and FF 3.1b3 throw `Error`s and `TypeError`s,
                  // respectively, if the value is omitted entirely.
                  stringify() === undef &&
                  // FF 3.1b1, 2 throw an error if the given value is not a number,
                  // string, array, object, Boolean, or `null` literal. This applies to
                  // objects with custom `toJSON` methods as well, unless they are nested
                  // inside object or array literals. YUI 3.0.0b1 ignores custom `toJSON`
                  // methods entirely.
                  stringify(value) === "1" &&
                  stringify([value]) == "[1]" &&
                  // Prototype <= 1.6.1 serializes `[undefined]` as `"[]"` instead of
                  // `"[null]"`.
                  stringify([undef]) == "[null]" &&
                  // YUI 3.0.0b1 fails to serialize `null` literals.
                  stringify(null) == "null" &&
                  // FF 3.1b1, 2 halts serialization if an array contains a function:
                  // `[1, true, getClass, 1]` serializes as "[1,true,],". FF 3.1b3
                  // elides non-JSON values from objects and arrays, unless they
                  // define custom `toJSON` methods.
                  stringify([undef, getClass, null]) == "[null,null,null]" &&
                  // Simple serialization test. FF 3.1b1 uses Unicode escape sequences
                  // where character escape codes are expected (e.g., `\b` => `\u0008`).
                  stringify({ "a": [value, true, false, null, "\x00\b\n\f\r\t"] }) == serialized &&
                  // FF 3.1b1 and b2 ignore the `filter` and `width` arguments.
                  stringify(null, value) === "1" &&
                  stringify([1, 2], null, 1) == "[\n 1,\n 2\n]" &&
                  // JSON 2, Prototype <= 1.7, and older WebKit builds incorrectly
                  // serialize extended years.
                  stringify(new Date(-8.64e15)) == '"-271821-04-20T00:00:00.000Z"' &&
                  // The milliseconds are optional in ES 5, but required in 5.1.
                  stringify(new Date(8.64e15)) == '"+275760-09-13T00:00:00.000Z"' &&
                  // Firefox <= 11.0 incorrectly serializes years prior to 0 as negative
                  // four-digit years instead of six-digit years. Credits: @Yaffle.
                  stringify(new Date(-621987552e5)) == '"-000001-01-01T00:00:00.000Z"' &&
                  // Safari <= 5.1.5 and Opera >= 10.53 incorrectly serialize millisecond
                  // values less than 1000. Credits: @Yaffle.
                  stringify(new Date(-1)) == '"1969-12-31T23:59:59.999Z"';
              } catch (exception) {
                stringifySupported = false;
              }
            }
            isSupported = stringifySupported;
          }
          // Test `JSON.parse`.
          if (name == "json-parse") {
            var parse = JSON3.parse;
            Eif (typeof parse == "function") {
              try {
                // FF 3.1b1, b2 will throw an exception if a bare literal is provided.
                // Conforming implementations should also coerce the initial argument to
                // a string prior to parsing.
                Eif (parse("0") === 0 && !parse(false)) {
                  // Simple parsing test.
                  value = parse(serialized);
                  var parseSupported = value["a"].length == 5 && value["a"][0] === 1;
                  Eif (parseSupported) {
                    try {
                      // Safari <= 5.1.2 and FF 3.1b1 allow unescaped tabs in strings.
                      parseSupported = !parse('"\t"');
                    } catch (exception) {}
                    Eif (parseSupported) {
                      try {
                        // FF 4.0 and 4.0.1 allow leading `+` signs and leading
                        // decimal points. FF 4.0, 4.0.1, and IE 9-10 also allow
                        // certain octal literals.
                        parseSupported = parse("01") !== 1;
                      } catch (exception) {}
                    }
                    Eif (parseSupported) {
                      try {
                        // FF 4.0, 4.0.1, and Rhino 1.7R3-R4 allow trailing decimal
                        // points. These environments, along with FF 3.1b1 and 2,
                        // also allow trailing commas in JSON objects and arrays.
                        parseSupported = parse("1.") !== 1;
                      } catch (exception) {}
                    }
                  }
                }
              } catch (exception) {
                parseSupported = false;
              }
            }
            isSupported = parseSupported;
          }
        }
        return has[name] = !!isSupported;
      }
      has["bug-string-char-index"] = null;
      has["json"] = null;
      has["json-stringify"] = null;
      has["json-parse"] = null;

      Iif (!has("json")) {
        // Common `[[Class]]` name aliases.
        var functionClass = "[object Function]";
        var dateClass = "[object Date]";
        var numberClass = "[object Number]";
        var stringClass = "[object String]";
        var arrayClass = "[object Array]";
        var booleanClass = "[object Boolean]";

        // Detect incomplete support for accessing string characters by index.
        var charIndexBuggy = has("bug-string-char-index");

        // Define additional utility methods if the `Date` methods are buggy.
        if (!isExtended) {
          var floor = Math.floor;
          // A mapping between the months of the year and the number of days between
          // January 1st and the first of the respective month.
          var Months = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
          // Internal: Calculates the number of days between the Unix epoch and the
          // first day of the given month.
          var getDay = function (year, month) {
            return Months[month] + 365 * (year - 1970) + floor((year - 1969 + (month = +(month > 1))) / 4) - floor((year - 1901 + month) / 100) + floor((year - 1601 + month) / 400);
          };
        }

        // Internal: Determines if a property is a direct property of the given
        // object. Delegates to the native `Object#hasOwnProperty` method.
        if (!(isProperty = {}.hasOwnProperty)) {
          isProperty = function (property) {
            var members = {}, constructor;
            if ((members.__proto__ = null, members.__proto__ = {
              // The *proto* property cannot be set multiple times in recent
              // versions of Firefox and SeaMonkey.
              "toString": 1
            }, members).toString != getClass) {
              // Safari <= 2.0.3 doesn't implement `Object#hasOwnProperty`, but
              // supports the mutable *proto* property.
              isProperty = function (property) {
                // Capture and break the object's prototype chain (see section 8.6.2
                // of the ES 5.1 spec). The parenthesized expression prevents an
                // unsafe transformation by the Closure Compiler.
                var original = this.__proto__, result = property in (this.__proto__ = null, this);
                // Restore the original prototype chain.
                this.__proto__ = original;
                return result;
              };
            } else {
              // Capture a reference to the top-level `Object` constructor.
              constructor = members.constructor;
              // Use the `constructor` property to simulate `Object#hasOwnProperty` in
              // other environments.
              isProperty = function (property) {
                var parent = (this.constructor || constructor).prototype;
                return property in this && !(property in parent && this[property] === parent[property]);
              };
            }
            members = null;
            return isProperty.call(this, property);
          };
        }

        // Internal: A set of primitive types used by `isHostType`.
        var PrimitiveTypes = {
          'boolean': 1,
          'number': 1,
          'string': 1,
          'undefined': 1
        };

        // Internal: Determines if the given object `property` value is a
        // non-primitive.
        var isHostType = function (object, property) {
          var type = typeof object[property];
          return type == 'object' ? !!object[property] : !PrimitiveTypes[type];
        };

        // Internal: Normalizes the `for...in` iteration algorithm across
        // environments. Each enumerated key is yielded to a `callback` function.
        forEach = function (object, callback) {
          var size = 0, Properties, members, property;

          // Tests for bugs in the current environment's `for...in` algorithm. The
          // `valueOf` property inherits the non-enumerable flag from
          // `Object.prototype` in older versions of IE, Netscape, and Mozilla.
          (Properties = function () {
            this.valueOf = 0;
          }).prototype.valueOf = 0;

          // Iterate over a new instance of the `Properties` class.
          members = new Properties();
          for (property in members) {
            // Ignore all properties inherited from `Object.prototype`.
            if (isProperty.call(members, property)) {
              size++;
            }
          }
          Properties = members = null;

          // Normalize the iteration algorithm.
          if (!size) {
            // A list of non-enumerable properties inherited from `Object.prototype`.
            members = ["valueOf", "toString", "toLocaleString", "propertyIsEnumerable", "isPrototypeOf", "hasOwnProperty", "constructor"];
            // IE <= 8, Mozilla 1.0, and Netscape 6.2 ignore shadowed non-enumerable
            // properties.
            forEach = function (object, callback) {
              var isFunction = getClass.call(object) == functionClass, property, length;
              var hasProperty = !isFunction && typeof object.constructor != 'function' && isHostType(object, 'hasOwnProperty') ? object.hasOwnProperty : isProperty;
              for (property in object) {
                // Gecko <= 1.0 enumerates the `prototype` property of functions under
                // certain conditions; IE does not.
                if (!(isFunction && property == "prototype") && hasProperty.call(object, property)) {
                  callback(property);
                }
              }
              // Manually invoke the callback for each non-enumerable property.
              for (length = members.length; property = members[--length]; hasProperty.call(object, property) && callback(property));
            };
          } else if (size == 2) {
            // Safari <= 2.0.4 enumerates shadowed properties twice.
            forEach = function (object, callback) {
              // Create a set of iterated properties.
              var members = {}, isFunction = getClass.call(object) == functionClass, property;
              for (property in object) {
                // Store each property name to prevent double enumeration. The
                // `prototype` property of functions is not enumerated due to cross-
                // environment inconsistencies.
                if (!(isFunction && property == "prototype") && !isProperty.call(members, property) && (members[property] = 1) && isProperty.call(object, property)) {
                  callback(property);
                }
              }
            };
          } else {
            // No bugs detected; use the standard `for...in` algorithm.
            forEach = function (object, callback) {
              var isFunction = getClass.call(object) == functionClass, property, isConstructor;
              for (property in object) {
                if (!(isFunction && property == "prototype") && isProperty.call(object, property) && !(isConstructor = property === "constructor")) {
                  callback(property);
                }
              }
              // Manually invoke the callback for the `constructor` property due to
              // cross-environment inconsistencies.
              if (isConstructor || isProperty.call(object, (property = "constructor"))) {
                callback(property);
              }
            };
          }
          return forEach(object, callback);
        };

        // Public: Serializes a JavaScript `value` as a JSON string. The optional
        // `filter` argument may specify either a function that alters how object and
        // array members are serialized, or an array of strings and numbers that
        // indicates which properties should be serialized. The optional `width`
        // argument may be either a string or number that specifies the indentation
        // level of the output.
        if (!has("json-stringify")) {
          // Internal: A map of control characters and their escaped equivalents.
          var Escapes = {
            92: "\\\\",
            34: '\\"',
            8: "\\b",
            12: "\\f",
            10: "\\n",
            13: "\\r",
            9: "\\t"
          };

          // Internal: Converts `value` into a zero-padded string such that its
          // length is at least equal to `width`. The `width` must be <= 6.
          var leadingZeroes = "000000";
          var toPaddedString = function (width, value) {
            // The `|| 0` expression is necessary to work around a bug in
            // Opera <= 7.54u2 where `0 == -0`, but `String(-0) !== "0"`.
            return (leadingZeroes + (value || 0)).slice(-width);
          };

          // Internal: Double-quotes a string `value`, replacing all ASCII control
          // characters (characters with code unit values between 0 and 31) with
          // their escaped equivalents. This is an implementation of the
          // `Quote(value)` operation defined in ES 5.1 section 15.12.3.
          var unicodePrefix = "\\u00";
          var quote = function (value) {
            var result = '"', index = 0, length = value.length, isLarge = length > 10 && charIndexBuggy, symbols;
            if (isLarge) {
              symbols = value.split("");
            }
            for (; index < length; index++) {
              var charCode = value.charCodeAt(index);
              // If the character is a control character, append its Unicode or
              // shorthand escape sequence; otherwise, append the character as-is.
              switch (charCode) {
                case 8: case 9: case 10: case 12: case 13: case 34: case 92:
                  result += Escapes[charCode];
                  break;
                default:
                  if (charCode < 32) {
                    result += unicodePrefix + toPaddedString(2, charCode.toString(16));
                    break;
                  }
                  result += isLarge ? symbols[index] : charIndexBuggy ? value.charAt(index) : value[index];
              }
            }
            return result + '"';
          };

          // Internal: Recursively serializes an object. Implements the
          // `Str(key, holder)`, `JO(value)`, and `JA(value)` operations.
          var serialize = function (property, object, callback, properties, whitespace, indentation, stack) {
            var value, className, year, month, date, time, hours, minutes, seconds, milliseconds, results, element, index, length, prefix, hasMembers, result;
            try {
              // Necessary for host object support.
              value = object[property];
            } catch (exception) {}
            if (typeof value == "object" && value) {
              className = getClass.call(value);
              if (className == dateClass && !isProperty.call(value, "toJSON")) {
                if (value > -1 / 0 && value < 1 / 0) {
                  // Dates are serialized according to the `Date#toJSON` method
                  // specified in ES 5.1 section 15.9.5.44. See section 15.9.1.15
                  // for the ISO 8601 date time string format.
                  if (getDay) {
                    // Manually compute the year, month, date, hours, minutes,
                    // seconds, and milliseconds if the `getUTC*` methods are
                    // buggy. Adapted from @Yaffle's `date-shim` project.
                    date = floor(value / 864e5);
                    for (year = floor(date / 365.2425) + 1970 - 1; getDay(year + 1, 0) <= date; year++);
                    for (month = floor((date - getDay(year, 0)) / 30.42); getDay(year, month + 1) <= date; month++);
                    date = 1 + date - getDay(year, month);
                    // The `time` value specifies the time within the day (see ES
                    // 5.1 section 15.9.1.2). The formula `(A % B + B) % B` is used
                    // to compute `A modulo B`, as the `%` operator does not
                    // correspond to the `modulo` operation for negative numbers.
                    time = (value % 864e5 + 864e5) % 864e5;
                    // The hours, minutes, seconds, and milliseconds are obtained by
                    // decomposing the time within the day. See section 15.9.1.10.
                    hours = floor(time / 36e5) % 24;
                    minutes = floor(time / 6e4) % 60;
                    seconds = floor(time / 1e3) % 60;
                    milliseconds = time % 1e3;
                  } else {
                    year = value.getUTCFullYear();
                    month = value.getUTCMonth();
                    date = value.getUTCDate();
                    hours = value.getUTCHours();
                    minutes = value.getUTCMinutes();
                    seconds = value.getUTCSeconds();
                    milliseconds = value.getUTCMilliseconds();
                  }
                  // Serialize extended years correctly.
                  value = (year <= 0 || year >= 1e4 ? (year < 0 ? "-" : "+") + toPaddedString(6, year < 0 ? -year : year) : toPaddedString(4, year)) +
                    "-" + toPaddedString(2, month + 1) + "-" + toPaddedString(2, date) +
                    // Months, dates, hours, minutes, and seconds should have two
                    // digits; milliseconds should have three.
                    "T" + toPaddedString(2, hours) + ":" + toPaddedString(2, minutes) + ":" + toPaddedString(2, seconds) +
                    // Milliseconds are optional in ES 5.0, but required in 5.1.
                    "." + toPaddedString(3, milliseconds) + "Z";
                } else {
                  value = null;
                }
              } else if (typeof value.toJSON == "function" && ((className != numberClass && className != stringClass && className != arrayClass) || isProperty.call(value, "toJSON"))) {
                // Prototype <= 1.6.1 adds non-standard `toJSON` methods to the
                // `Number`, `String`, `Date`, and `Array` prototypes. JSON 3
                // ignores all `toJSON` methods on these objects unless they are
                // defined directly on an instance.
                value = value.toJSON(property);
              }
            }
            if (callback) {
              // If a replacement function was provided, call it to obtain the value
              // for serialization.
              value = callback.call(object, property, value);
            }
            if (value === null) {
              return "null";
            }
            className = getClass.call(value);
            if (className == booleanClass) {
              // Booleans are represented literally.
              return "" + value;
            } else if (className == numberClass) {
              // JSON numbers must be finite. `Infinity` and `NaN` are serialized as
              // `"null"`.
              return value > -1 / 0 && value < 1 / 0 ? "" + value : "null";
            } else if (className == stringClass) {
              // Strings are double-quoted and escaped.
              return quote("" + value);
            }
            // Recursively serialize objects and arrays.
            if (typeof value == "object") {
              // Check for cyclic structures. This is a linear search; performance
              // is inversely proportional to the number of unique nested objects.
              for (length = stack.length; length--;) {
                if (stack[length] === value) {
                  // Cyclic structures cannot be serialized by `JSON.stringify`.
                  throw TypeError();
                }
              }
              // Add the object to the stack of traversed objects.
              stack.push(value);
              results = [];
              // Save the current indentation level and indent one additional level.
              prefix = indentation;
              indentation += whitespace;
              if (className == arrayClass) {
                // Recursively serialize array elements.
                for (index = 0, length = value.length; index < length; hasMembers || (hasMembers = true), index++) {
                  element = serialize(index, value, callback, properties, whitespace, indentation, stack);
                  results.push(element === undef ? "null" : element);
                }
                result = hasMembers ? (whitespace ? "[\n" + indentation + results.join(",\n" + indentation) + "\n" + prefix + "]" : ("[" + results.join(",") + "]")) : "[]";
              } else {
                // Recursively serialize object members. Members are selected from
                // either a user-specified list of property names, or the object
                // itself.
                forEach(properties || value, function (property) {
                  var element = serialize(property, value, callback, properties, whitespace, indentation, stack);
                  if (element !== undef) {
                    // According to ES 5.1 section 15.12.3: "If `gap` {whitespace}
                    // is not the empty string, let `member` {quote(property) + ":"}
                    // be the concatenation of `member` and the `space` character."
                    // The "`space` character" refers to the literal space
                    // character, not the `space` {width} argument provided to
                    // `JSON.stringify`.
                    results.push(quote(property) + ":" + (whitespace ? " " : "") + element);
                  }
                  hasMembers || (hasMembers = true);
                });
                result = hasMembers ? (whitespace ? "{\n" + indentation + results.join(",\n" + indentation) + "\n" + prefix + "}" : ("{" + results.join(",") + "}")) : "{}";
              }
              // Remove the object from the traversed object stack.
              stack.pop();
              return result;
            }
          };

          // Public: `JSON.stringify`. See ES 5.1 section 15.12.3.
          JSON3.stringify = function (source, filter, width) {
            var whitespace, callback, properties, className;
            if (typeof filter == "function" || typeof filter == "object" && filter) {
              if ((className = getClass.call(filter)) == functionClass) {
                callback = filter;
              } else if (className == arrayClass) {
                // Convert the property names array into a makeshift set.
                properties = {};
                for (var index = 0, length = filter.length, value; index < length; value = filter[index++], ((getClass.call(value) == stringClass || getClass.call(value) == numberClass) && (properties[value] = 1)));
              }
            }
            if (width) {
              if ((className = getClass.call(width)) == numberClass) {
                // Convert the `width` to an integer and create a string containing
                // `width` number of space characters.
                if ((width -= width % 1) > 0) {
                  for (whitespace = "", width > 10 && (width = 10); whitespace.length < width; whitespace += " ");
                }
              } else if (className == stringClass) {
                whitespace = width.length <= 10 ? width : width.slice(0, 10);
              }
            }
            // Opera <= 7.54u2 discards the values associated with empty string keys
            // (`""`) only if they are used directly within an object member list
            // (e.g., `!("" in { "": 1})`).
            return serialize("", (value = {}, value[""] = source, value), callback, properties, whitespace, "", []);
          };
        }

        // Public: Parses a JSON source string.
        if (!has("json-parse")) {
          var fromCharCode = String.fromCharCode;

          // Internal: A map of escaped control characters and their unescaped
          // equivalents.
          var Unescapes = {
            92: "\\",
            34: '"',
            47: "/",
            98: "\b",
            116: "\t",
            110: "\n",
            102: "\f",
            114: "\r"
          };

          // Internal: Stores the parser state.
          var Index, Source;

          // Internal: Resets the parser state and throws a `SyntaxError`.
          var abort = function() {
            Index = Source = null;
            throw SyntaxError();
          };

          // Internal: Returns the next token, or `"$"` if the parser has reached
          // the end of the source string. A token may be a string, number, `null`
          // literal, or Boolean literal.
          var lex = function () {
            var source = Source, length = source.length, value, begin, position, isSigned, charCode;
            while (Index < length) {
              charCode = source.charCodeAt(Index);
              switch (charCode) {
                case 9: case 10: case 13: case 32:
                  // Skip whitespace tokens, including tabs, carriage returns, line
                  // feeds, and space characters.
                  Index++;
                  break;
                case 123: case 125: case 91: case 93: case 58: case 44:
                  // Parse a punctuator token (`{`, `}`, `[`, `]`, `:`, or `,`) at
                  // the current position.
                  value = charIndexBuggy ? source.charAt(Index) : source[Index];
                  Index++;
                  return value;
                case 34:
                  // `"` delimits a JSON string; advance to the next character and
                  // begin parsing the string. String tokens are prefixed with the
                  // sentinel `@` character to distinguish them from punctuators and
                  // end-of-string tokens.
                  for (value = "@", Index++; Index < length;) {
                    charCode = source.charCodeAt(Index);
                    if (charCode < 32) {
                      // Unescaped ASCII control characters (those with a code unit
                      // less than the space character) are not permitted.
                      abort();
                    } else if (charCode == 92) {
                      // A reverse solidus (`\`) marks the beginning of an escaped
                      // control character (including `"`, `\`, and `/`) or Unicode
                      // escape sequence.
                      charCode = source.charCodeAt(++Index);
                      switch (charCode) {
                        case 92: case 34: case 47: case 98: case 116: case 110: case 102: case 114:
                          // Revive escaped control characters.
                          value += Unescapes[charCode];
                          Index++;
                          break;
                        case 117:
                          // `\u` marks the beginning of a Unicode escape sequence.
                          // Advance to the first character and validate the
                          // four-digit code point.
                          begin = ++Index;
                          for (position = Index + 4; Index < position; Index++) {
                            charCode = source.charCodeAt(Index);
                            // A valid sequence comprises four hexdigits (case-
                            // insensitive) that form a single hexadecimal value.
                            if (!(charCode >= 48 && charCode <= 57 || charCode >= 97 && charCode <= 102 || charCode >= 65 && charCode <= 70)) {
                              // Invalid Unicode escape sequence.
                              abort();
                            }
                          }
                          // Revive the escaped character.
                          value += fromCharCode("0x" + source.slice(begin, Index));
                          break;
                        default:
                          // Invalid escape sequence.
                          abort();
                      }
                    } else {
                      if (charCode == 34) {
                        // An unescaped double-quote character marks the end of the
                        // string.
                        break;
                      }
                      charCode = source.charCodeAt(Index);
                      begin = Index;
                      // Optimize for the common case where a string is valid.
                      while (charCode >= 32 && charCode != 92 && charCode != 34) {
                        charCode = source.charCodeAt(++Index);
                      }
                      // Append the string as-is.
                      value += source.slice(begin, Index);
                    }
                  }
                  if (source.charCodeAt(Index) == 34) {
                    // Advance to the next character and return the revived string.
                    Index++;
                    return value;
                  }
                  // Unterminated string.
                  abort();
                default:
                  // Parse numbers and literals.
                  begin = Index;
                  // Advance past the negative sign, if one is specified.
                  if (charCode == 45) {
                    isSigned = true;
                    charCode = source.charCodeAt(++Index);
                  }
                  // Parse an integer or floating-point value.
                  if (charCode >= 48 && charCode <= 57) {
                    // Leading zeroes are interpreted as octal literals.
                    if (charCode == 48 && ((charCode = source.charCodeAt(Index + 1)), charCode >= 48 && charCode <= 57)) {
                      // Illegal octal literal.
                      abort();
                    }
                    isSigned = false;
                    // Parse the integer component.
                    for (; Index < length && ((charCode = source.charCodeAt(Index)), charCode >= 48 && charCode <= 57); Index++);
                    // Floats cannot contain a leading decimal point; however, this
                    // case is already accounted for by the parser.
                    if (source.charCodeAt(Index) == 46) {
                      position = ++Index;
                      // Parse the decimal component.
                      for (; position < length && ((charCode = source.charCodeAt(position)), charCode >= 48 && charCode <= 57); position++);
                      if (position == Index) {
                        // Illegal trailing decimal.
                        abort();
                      }
                      Index = position;
                    }
                    // Parse exponents. The `e` denoting the exponent is
                    // case-insensitive.
                    charCode = source.charCodeAt(Index);
                    if (charCode == 101 || charCode == 69) {
                      charCode = source.charCodeAt(++Index);
                      // Skip past the sign following the exponent, if one is
                      // specified.
                      if (charCode == 43 || charCode == 45) {
                        Index++;
                      }
                      // Parse the exponential component.
                      for (position = Index; position < length && ((charCode = source.charCodeAt(position)), charCode >= 48 && charCode <= 57); position++);
                      if (position == Index) {
                        // Illegal empty exponent.
                        abort();
                      }
                      Index = position;
                    }
                    // Coerce the parsed value to a JavaScript number.
                    return +source.slice(begin, Index);
                  }
                  // A negative sign may only precede numbers.
                  if (isSigned) {
                    abort();
                  }
                  // `true`, `false`, and `null` literals.
                  if (source.slice(Index, Index + 4) == "true") {
                    Index += 4;
                    return true;
                  } else if (source.slice(Index, Index + 5) == "false") {
                    Index += 5;
                    return false;
                  } else if (source.slice(Index, Index + 4) == "null") {
                    Index += 4;
                    return null;
                  }
                  // Unrecognized token.
                  abort();
              }
            }
            // Return the sentinel `$` character if the parser has reached the end
            // of the source string.
            return "$";
          };

          // Internal: Parses a JSON `value` token.
          var get = function (value) {
            var results, hasMembers;
            if (value == "$") {
              // Unexpected end of input.
              abort();
            }
            if (typeof value == "string") {
              if ((charIndexBuggy ? value.charAt(0) : value[0]) == "@") {
                // Remove the sentinel `@` character.
                return value.slice(1);
              }
              // Parse object and array literals.
              if (value == "[") {
                // Parses a JSON array, returning a new JavaScript array.
                results = [];
                for (;; hasMembers || (hasMembers = true)) {
                  value = lex();
                  // A closing square bracket marks the end of the array literal.
                  if (value == "]") {
                    break;
                  }
                  // If the array literal contains elements, the current token
                  // should be a comma separating the previous element from the
                  // next.
                  if (hasMembers) {
                    if (value == ",") {
                      value = lex();
                      if (value == "]") {
                        // Unexpected trailing `,` in array literal.
                        abort();
                      }
                    } else {
                      // A `,` must separate each array element.
                      abort();
                    }
                  }
                  // Elisions and leading commas are not permitted.
                  if (value == ",") {
                    abort();
                  }
                  results.push(get(value));
                }
                return results;
              } else if (value == "{") {
                // Parses a JSON object, returning a new JavaScript object.
                results = {};
                for (;; hasMembers || (hasMembers = true)) {
                  value = lex();
                  // A closing curly brace marks the end of the object literal.
                  if (value == "}") {
                    break;
                  }
                  // If the object literal contains members, the current token
                  // should be a comma separator.
                  if (hasMembers) {
                    if (value == ",") {
                      value = lex();
                      if (value == "}") {
                        // Unexpected trailing `,` in object literal.
                        abort();
                      }
                    } else {
                      // A `,` must separate each object member.
                      abort();
                    }
                  }
                  // Leading commas are not permitted, object property names must be
                  // double-quoted strings, and a `:` must separate each property
                  // name and value.
                  if (value == "," || typeof value != "string" || (charIndexBuggy ? value.charAt(0) : value[0]) != "@" || lex() != ":") {
                    abort();
                  }
                  results[value.slice(1)] = get(lex());
                }
                return results;
              }
              // Unexpected token encountered.
              abort();
            }
            return value;
          };

          // Internal: Updates a traversed object member.
          var update = function(source, property, callback) {
            var element = walk(source, property, callback);
            if (element === undef) {
              delete source[property];
            } else {
              source[property] = element;
            }
          };

          // Internal: Recursively traverses a parsed JSON object, invoking the
          // `callback` function for each value. This is an implementation of the
          // `Walk(holder, name)` operation defined in ES 5.1 section 15.12.2.
          var walk = function (source, property, callback) {
            var value = source[property], length;
            if (typeof value == "object" && value) {
              // `forEach` can't be used to traverse an array in Opera <= 8.54
              // because its `Object#hasOwnProperty` implementation returns `false`
              // for array indices (e.g., `![1, 2, 3].hasOwnProperty("0")`).
              if (getClass.call(value) == arrayClass) {
                for (length = value.length; length--;) {
                  update(value, length, callback);
                }
              } else {
                forEach(value, function (property) {
                  update(value, property, callback);
                });
              }
            }
            return callback.call(source, property, value);
          };

          // Public: `JSON.parse`. See ES 5.1 section 15.12.2.
          JSON3.parse = function (source, callback) {
            var result, value;
            Index = 0;
            Source = "" + source;
            result = get(lex());
            // If a JSON string contains multiple tokens, it is invalid.
            if (lex() != "$") {
              abort();
            }
            // Reset the parser state.
            Index = Source = null;
            return callback && getClass.call(callback) == functionClass ? walk((value = {}, value[""] = result, value), "", callback) : result;
          };
        }
      }

      // Export for asynchronous module loaders.
      Iif (isLoader) {
        define(function () {
          return JSON3;
        });
      }
    }(this));