Inflate dev test dependencies for easier inspection and swap firebug-lite with its debug build for Opera support.

Former-commit-id: 2f9ee3e33384b5ef5ed3da9c9ad5bbe7b561d265

vendor/json3/lib/json3.js

@@ -0,0 +1,783 @@
+/*! JSON v3.2.4 | http://bestiejs.github.com/json3 | Copyright 2012, Kit Cambridge | http://kit.mit-license.org */
+;(function () {
+  // 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, JSON3 = !isLoader && typeof exports == "object" && exports;
+
+  if (JSON3 || isLoader) {
+    if (typeof JSON == "object" && JSON) {
+      // Delegate to the native `stringify` and `parse` implementations in
+      // asynchronous module loaders and CommonJS environments.
+      if (isLoader) {
+        JSON3 = JSON;
+      } else {
+        JSON3.stringify = JSON.stringify;
+        JSON3.parse = JSON.parse;
+      }
+    } else if (isLoader) {
+      JSON3 = this.JSON = {};
+    }
+  } else {
+    // Export for web browsers and JavaScript engines.
+    JSON3 = this.JSON || (this.JSON = {});
+  }
+
+  // Local variables.
+  var Escapes, toPaddedString, quote, serialize;
+  var fromCharCode, Unescapes, abort, lex, get, walk, update, Index, Source;
+
+  // Test the `Date#getUTC*` methods. Based on work by @Yaffle.
+  var isExtended = new Date(-3509827334573292), floor, Months, getDay;
+
+  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) {
+    var stringifySupported, parseSupported, value, serialized = '{"A":[1,true,false,null,"\\u0000\\b\\n\\f\\r\\t"]}', all = name == "json";
+    if (all || name == "json-stringify" || name == "json-parse") {
+      // Test `JSON.stringify`.
+      if (name == "json-stringify" || all) {
+        if ((stringifySupported = typeof JSON3.stringify == "function" && isExtended)) {
+          // 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.
+              JSON3.stringify(0) === "0" &&
+              // FF 3.1b1, b2, and JSON 2 serialize wrapped primitives as object
+              // literals.
+              JSON3.stringify(new Number()) === "0" &&
+              JSON3.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).
+              JSON3.stringify(getClass) === undef &&
+              // IE 8 serializes `undefined` as `"undefined"`. Safari <= 5.1.7 and
+              // FF 3.1b3 pass this test.
+              JSON3.stringify(undef) === undef &&
+              // Safari <= 5.1.7 and FF 3.1b3 throw `Error`s and `TypeError`s,
+              // respectively, if the value is omitted entirely.
+              JSON3.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.
+              JSON3.stringify(value) === "1" &&
+              JSON3.stringify([value]) == "[1]" &&
+              // Prototype <= 1.6.1 serializes `[undefined]` as `"[]"` instead of
+              // `"[null]"`.
+              JSON3.stringify([undef]) == "[null]" &&
+              // YUI 3.0.0b1 fails to serialize `null` literals.
+              JSON3.stringify(null) == "null" &&
+              // FF 3.1b1, 2 halts serialization if an array contains a function:
+              // `[1, true, getClass, 1]` serializes as "[1,true,],". These versions
+              // of Firefox also allow trailing commas in JSON objects and arrays.
+              // FF 3.1b3 elides non-JSON values from objects and arrays, unless they
+              // define custom `toJSON` methods.
+              JSON3.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`).
+              JSON3.stringify({ "A": [value, true, false, null, "\0\b\n\f\r\t"] }) == serialized &&
+              // FF 3.1b1 and b2 ignore the `filter` and `width` arguments.
+              JSON3.stringify(null, value) === "1" &&
+              JSON3.stringify([1, 2], null, 1) == "[\n 1,\n 2\n]" &&
+              // JSON 2, Prototype <= 1.7, and older WebKit builds incorrectly
+              // serialize extended years.
+              JSON3.stringify(new Date(-8.64e15)) == '"-271821-04-20T00:00:00.000Z"' &&
+              // The milliseconds are optional in ES 5, but required in 5.1.
+              JSON3.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.
+              JSON3.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.
+              JSON3.stringify(new Date(-1)) == '"1969-12-31T23:59:59.999Z"';
+          } catch (exception) {
+            stringifySupported = false;
+          }
+        }
+        if (!all) {
+          return stringifySupported;
+        }
+      }
+      // Test `JSON.parse`.
+      if (name == "json-parse" || all) {
+        if (typeof JSON3.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.
+            if (JSON3.parse("0") === 0 && !JSON3.parse(false)) {
+              // Simple parsing test.
+              value = JSON3.parse(serialized);
+              if ((parseSupported = value.A.length == 5 && value.A[0] == 1)) {
+                try {
+                  // Safari <= 5.1.2 and FF 3.1b1 allow unescaped tabs in strings.
+                  parseSupported = !JSON3.parse('"\t"');
+                } catch (exception) {}
+                if (parseSupported) {
+                  try {
+                    // FF 4.0 and 4.0.1 allow leading `+` signs, and leading and
+                    // trailing decimal points. FF 4.0, 4.0.1, and IE 9-10 also
+                    // allow certain octal literals.
+                    parseSupported = JSON3.parse("01") != 1;
+                  } catch (exception) {}
+                }
+              }
+            }
+          } catch (exception) {
+            parseSupported = false;
+          }
+        }
+        if (!all) {
+          return parseSupported;
+        }
+      }
+      return stringifySupported && parseSupported;
+    }
+  }
+
+  if (!has("json")) {
+    // Define additional utility methods if the `Date` methods are buggy.
+    if (!isExtended) {
+      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.
+      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.
+      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: 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, forEach;
+
+      // 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) == "[object Function]", property, length;
+          for (property in object) {
+            // Gecko <= 1.0 enumerates the `prototype` property of functions under
+            // certain conditions; IE does not.
+            if (!(isFunction && property == "prototype") && isProperty.call(object, property)) {
+              callback(property);
+            }
+          }
+          // Manually invoke the callback for each non-enumerable property.
+          for (length = members.length; property = members[--length]; isProperty.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) == "[object Function]", 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) == "[object Function]", 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.
+      Escapes = {
+        "\\": "\\\\",
+        '"': '\\"',
+        "\b": "\\b",
+        "\f": "\\f",
+        "\n": "\\n",
+        "\r": "\\r",
+        "\t": "\\t"
+      };
+
+      // Internal: Converts `value` into a zero-padded string such that its
+      // length is at least equal to `width`. The `width` must be <= 6.
+      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 ("000000" + (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.
+      quote = function (value) {
+        var result = '"', index = 0, symbol;
+        for (; symbol = value.charAt(index); index++) {
+          // Escape the reverse solidus, double quote, backspace, form feed, line
+          // feed, carriage return, and tab characters.
+          result += '\\"\b\f\n\r\t'.indexOf(symbol) > -1 ? Escapes[symbol] :
+            // If the character is a control character, append its Unicode escape
+            // sequence; otherwise, append the character as-is.
+            (Escapes[symbol] = symbol < " " ? "\\u00" + toPaddedString(2, symbol.charCodeAt(0).toString(16)) : symbol);
+        }
+        return result + '"';
+      };
+
+      // Internal: Recursively serializes an object. Implements the
+      // `Str(key, holder)`, `JO(value)`, and `JA(value)` operations.
+      serialize = function (property, object, callback, properties, whitespace, indentation, stack) {
+        var value = object[property], className, year, month, date, time, hours, minutes, seconds, milliseconds, results, element, index, length, prefix, any, result;
+        if (typeof value == "object" && value) {
+          className = getClass.call(value);
+          if (className == "[object Date]" && !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 != "[object Number]" && className != "[object String]" && className != "[object Array]") || 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 == "[object Boolean]") {
+          // Booleans are represented literally.
+          return "" + value;
+        } else if (className == "[object Number]") {
+          // JSON numbers must be finite. `Infinity` and `NaN` are serialized as
+          // `"null"`.
+          return value > -1 / 0 && value < 1 / 0 ? "" + value : "null";
+        } else if (className == "[object String]") {
+          // 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 == "[object Array]") {
+            // Recursively serialize array elements.
+            for (index = 0, length = value.length; index < length; any || (any = true), index++) {
+              element = serialize(index, value, callback, properties, whitespace, indentation, stack);
+              results.push(element === undef ? "null" : element);
+            }
+            result = any ? (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);
+              }
+              any || (any = true);
+            });
+            result = any ? (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, index, length, value;
+        if (typeof filter == "function" || typeof filter == "object" && filter) {
+          if (getClass.call(filter) == "[object Function]") {
+            callback = filter;
+          } else if (getClass.call(filter) == "[object Array]") {
+            // Convert the property names array into a makeshift set.
+            properties = {};
+            for (index = 0, length = filter.length; index < length; value = filter[index++], ((getClass.call(value) == "[object String]" || getClass.call(value) == "[object Number]") && (properties[value] = 1)));
+          }
+        }
+        if (width) {
+          if (getClass.call(width) == "[object Number]") {
+            // 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 (getClass.call(width) == "[object String]") {
+            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")) {
+      fromCharCode = String.fromCharCode;
+      // Internal: A map of escaped control characters and their unescaped
+      // equivalents.
+      Unescapes = {
+        "\\": "\\",
+        '"': '"',
+        "/": "/",
+        "b": "\b",
+        "t": "\t",
+        "n": "\n",
+        "f": "\f",
+        "r": "\r"
+      };
+
+      // Internal: Resets the parser state and throws a `SyntaxError`.
+      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.
+      lex = function () {
+        var source = Source, length = source.length, symbol, value, begin, position, sign;
+        while (Index < length) {
+          symbol = source.charAt(Index);
+          if ("\t\r\n ".indexOf(symbol) > -1) {
+            // Skip whitespace tokens, including tabs, carriage returns, line
+            // feeds, and space characters.
+            Index++;
+          } else if ("{}[]:,".indexOf(symbol) > -1) {
+            // Parse a punctuator token at the current position.
+            Index++;
+            return symbol;
+          } else if (symbol == '"') {
+            // Advance to the next character and parse a JSON string at the
+            // current position. String tokens are prefixed with the sentinel
+            // `@` character to distinguish them from punctuators.
+            for (value = "@", Index++; Index < length;) {
+              symbol = source.charAt(Index);
+              if (symbol < " ") {
+                // Unescaped ASCII control characters are not permitted.
+                abort();
+              } else if (symbol == "\\") {
+                // Parse escaped JSON control characters, `"`, `\`, `/`, and
+                // Unicode escape sequences.
+                symbol = source.charAt(++Index);
+                if ('\\"/btnfr'.indexOf(symbol) > -1) {
+                  // Revive escaped control characters.
+                  value += Unescapes[symbol];
+                  Index++;
+                } else if (symbol == "u") {
+                  // Advance to the first character of the escape sequence.
+                  begin = ++Index;
+                  // Validate the Unicode escape sequence.
+                  for (position = Index + 4; Index < position; Index++) {
+                    symbol = source.charAt(Index);
+                    // A valid sequence comprises four hexdigits that form a
+                    // single hexadecimal value.
+                    if (!(symbol >= "0" && symbol <= "9" || symbol >= "a" && symbol <= "f" || symbol >= "A" && symbol <= "F")) {
+                      // Invalid Unicode escape sequence.
+                      abort();
+                    }
+                  }
+                  // Revive the escaped character.
+                  value += fromCharCode("0x" + source.slice(begin, Index));
+                } else {
+                  // Invalid escape sequence.
+                  abort();
+                }
+              } else {
+                if (symbol == '"') {
+                  // An unescaped double-quote character marks the end of the
+                  // string.
+                  break;
+                }
+                // Append the original character as-is.
+                value += symbol;
+                Index++;
+              }
+            }
+            if (source.charAt(Index) == '"') {
+              Index++;
+              // Return the revived string.
+              return value;
+            }
+            // Unterminated string.
+            abort();
+          } else {
+            // Parse numbers and literals.
+            begin = Index;
+            // Advance the scanner's position past the sign, if one is
+            // specified.
+            if (symbol == "-") {
+              sign = true;
+              symbol = source.charAt(++Index);
+            }
+            // Parse an integer or floating-point value.
+            if (symbol >= "0" && symbol <= "9") {
+              // Leading zeroes are interpreted as octal literals.
+              if (symbol == "0" && (symbol = source.charAt(Index + 1), symbol >= "0" && symbol <= "9")) {
+                // Illegal octal literal.
+                abort();
+              }
+              sign = false;
+              // Parse the integer component.
+              for (; Index < length && (symbol = source.charAt(Index), symbol >= "0" && symbol <= "9"); Index++);
+              // Floats cannot contain a leading decimal point; however, this
+              // case is already accounted for by the parser.
+              if (source.charAt(Index) == ".") {
+                position = ++Index;
+                // Parse the decimal component.
+                for (; position < length && (symbol = source.charAt(position), symbol >= "0" && symbol <= "9"); position++);
+                if (position == Index) {
+                  // Illegal trailing decimal.
+                  abort();
+                }
+                Index = position;
+              }
+              // Parse exponents.
+              symbol = source.charAt(Index);
+              if (symbol == "e" || symbol == "E") {
+                // Skip past the sign following the exponent, if one is
+                // specified.
+                symbol = source.charAt(++Index);
+                if (symbol == "+" || symbol == "-") {
+                  Index++;
+                }
+                // Parse the exponential component.
+                for (position = Index; position < length && (symbol = source.charAt(position), symbol >= "0" && symbol <= "9"); 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 (sign) {
+              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 "$";
+      };
+
+      // Internal: Parses a JSON `value` token.
+      get = function (value) {
+        var results, any, key;
+        if (value == "$") {
+          // Unexpected end of input.
+          abort();
+        }
+        if (typeof value == "string") {
+          if (value.charAt(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 (;; any || (any = 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 (any) {
+                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 (;; any || (any = 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 (any) {
+                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" || value.charAt(0) != "@" || lex() != ":") {
+                abort();
+              }
+              results[value.slice(1)] = get(lex());
+            }
+            return results;
+          }
+          // Unexpected token encountered.
+          abort();
+        }
+        return value;
+      };
+
+      // Internal: Updates a traversed object member.
+      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.
+      walk = function (source, property, callback) {
+        var value = source[property], length;
+        if (typeof value == "object" && value) {
+          if (getClass.call(value) == "[object Array]") {
+            for (length = value.length; length--;) {
+              update(value, length, callback);
+            }
+          } else {
+            // `forEach` can't be used to traverse an array in Opera <= 8.54,
+            // as `Object#hasOwnProperty` returns `false` for array indices
+            // (e.g., `![1, 2, 3].hasOwnProperty("0")`).
+            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) == "[object Function]" ? walk((value = {}, value[""] = result, value), "", callback) : result;
+      };
+    }
+  }
+
+  // Export for asynchronous module loaders.
+  if (isLoader) {
+    define(function () {
+      return JSON3;
+    });
+  }
+}).call(this);