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+/*
+  Copyright (c) 2008, Adobe Systems Incorporated
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without 
+  modification, are permitted provided that the following conditions are
+  met:
+
+  * Redistributions of source code must retain the above copyright notice, 
+    this list of conditions and the following disclaimer.
+  
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the 
+    documentation and/or other materials provided with the distribution.
+  
+  * Neither the name of Adobe Systems Incorporated nor the names of its 
+    contributors may be used to endorse or promote products derived from 
+    this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
+  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package com.adobe.serialization.json 
+{
+
+	import flash.utils.describeType;
+
+	public class JSONEncoder {
+	
+		/** The string that is going to represent the object we're encoding */
+		private var jsonString:String;
+		
+		/**
+		 * Creates a new JSONEncoder.
+		 *
+		 * @param o The object to encode as a JSON string
+		 * @langversion ActionScript 3.0
+		 * @playerversion Flash 9.0
+		 * @tiptext
+		 */
+		public function JSONEncoder( value:* ) {
+			jsonString = convertToString( value );
+		
+		}
+		
+		/**
+		 * Gets the JSON string from the encoder.
+		 *
+		 * @return The JSON string representation of the object
+		 * 		that was passed to the constructor
+		 * @langversion ActionScript 3.0
+		 * @playerversion Flash 9.0
+		 * @tiptext
+		 */
+		public function getString():String {
+			return jsonString;
+		}
+		
+		/**
+		 * Converts a value to it's JSON string equivalent.
+		 *
+		 * @param value The value to convert.  Could be any 
+		 *		type (object, number, array, etc)
+		 */
+		private function convertToString( value:* ):String {
+			
+			// determine what value is and convert it based on it's type
+			if ( value is String ) {
+				
+				// escape the string so it's formatted correctly
+				return escapeString( value as String );
+				
+			} else if ( value is Number ) {
+				
+				// only encode numbers that finate
+				return isFinite( value as Number) ? value.toString() : "null";
+
+			} else if ( value is Boolean ) {
+				
+				// convert boolean to string easily
+				return value ? "true" : "false";
+
+			} else if ( value is Array ) {
+			
+				// call the helper method to convert an array
+				return arrayToString( value as Array );
+			
+			} else if ( value is Object && value != null ) {
+			
+				// call the helper method to convert an object
+				return objectToString( value );
+			}
+            return "null";
+		}
+		
+		/**
+		 * Escapes a string accoding to the JSON specification.
+		 *
+		 * @param str The string to be escaped
+		 * @return The string with escaped special characters
+		 * 		according to the JSON specification
+		 */
+		private function escapeString( str:String ):String {
+			// create a string to store the string's jsonstring value
+			var s:String = "";
+			// current character in the string we're processing
+			var ch:String;
+			// store the length in a local variable to reduce lookups
+			var len:Number = str.length;
+			
+			// loop over all of the characters in the string
+			for ( var i:int = 0; i < len; i++ ) {
+			
+				// examine the character to determine if we have to escape it
+				ch = str.charAt( i );
+				switch ( ch ) {
+				
+					case '"':	// quotation mark
+						s += "\\\"";
+						break;
+						
+					//case '/':	// solidus
+					//	s += "\\/";
+					//	break;
+						
+					case '\\':	// reverse solidus
+						s += "\\\\";
+						break;
+						
+					case '\b':	// bell
+						s += "\\b";
+						break;
+						
+					case '\f':	// form feed
+						s += "\\f";
+						break;
+						
+					case '\n':	// newline
+						s += "\\n";
+						break;
+						
+					case '\r':	// carriage return
+						s += "\\r";
+						break;
+						
+					case '\t':	// horizontal tab
+						s += "\\t";
+						break;
+						
+					default:	// everything else
+						
+						// check for a control character and escape as unicode
+						if ( ch < ' ' ) {
+							// get the hex digit(s) of the character (either 1 or 2 digits)
+							var hexCode:String = ch.charCodeAt( 0 ).toString( 16 );
+							
+							// ensure that there are 4 digits by adjusting
+							// the # of zeros accordingly.
+							var zeroPad:String = hexCode.length == 2 ? "00" : "000";
+							
+							// create the unicode escape sequence with 4 hex digits
+							s += "\\u" + zeroPad + hexCode;
+						} else {
+						
+							// no need to do any special encoding, just pass-through
+							s += ch;
+							
+						}
+				}	// end switch
+				
+			}	// end for loop
+						
+			return "\"" + s + "\"";
+		}
+		
+		/**
+		 * Converts an array to it's JSON string equivalent
+		 *
+		 * @param a The array to convert
+		 * @return The JSON string representation of <code>a</code>
+		 */
+		private function arrayToString( a:Array ):String {
+			// create a string to store the array's jsonstring value
+			var s:String = "";
+			
+			// loop over the elements in the array and add their converted
+			// values to the string
+			for ( var i:int = 0; i < a.length; i++ ) {
+				// when the length is 0 we're adding the first element so
+				// no comma is necessary
+				if ( s.length > 0 ) {
+					// we've already added an element, so add the comma separator
+					s += ","
+				}
+				
+				// convert the value to a string
+				s += convertToString( a[i] );	
+			}
+			
+			// KNOWN ISSUE:  In ActionScript, Arrays can also be associative
+			// objects and you can put anything in them, ie:
+			//		myArray["foo"] = "bar";
+			//
+			// These properties aren't picked up in the for loop above because
+			// the properties don't correspond to indexes.  However, we're
+			// sort of out luck because the JSON specification doesn't allow
+			// these types of array properties.
+			//
+			// So, if the array was also used as an associative object, there
+			// may be some values in the array that don't get properly encoded.
+			//
+			// A possible solution is to instead encode the Array as an Object
+			// but then it won't get decoded correctly (and won't be an
+			// Array instance)
+						
+			// close the array and return it's string value
+			return "[" + s + "]";
+		}
+		
+		/**
+		 * Converts an object to it's JSON string equivalent
+		 *
+		 * @param o The object to convert
+		 * @return The JSON string representation of <code>o</code>
+		 */
+		private function objectToString( o:Object ):String
+		{
+			// create a string to store the object's jsonstring value
+			var s:String = "";
+			
+			// determine if o is a class instance or a plain object
+			var classInfo:XML = describeType( o );
+			if ( classInfo.@name.toString() == "Object" )
+			{
+				// the value of o[key] in the loop below - store this 
+				// as a variable so we don't have to keep looking up o[key]
+				// when testing for valid values to convert
+				var value:Object;
+				
+				// loop over the keys in the object and add their converted
+				// values to the string
+				for ( var key:String in o )
+				{
+					// assign value to a variable for quick lookup
+					value = o[key];
+					
+					// don't add function's to the JSON string
+					if ( value is Function )
+					{
+						// skip this key and try another
+						continue;
+					}
+					
+					// when the length is 0 we're adding the first item so
+					// no comma is necessary
+					if ( s.length > 0 ) {
+						// we've already added an item, so add the comma separator
+						s += ","
+					}
+					
+					s += escapeString( key ) + ":" + convertToString( value );
+				}
+			}
+			else // o is a class instance
+			{
+				// Loop over all of the variables and accessors in the class and 
+				// serialize them along with their values.
+				for each ( var v:XML in classInfo..*.( name() == "variable" || name() == "accessor" ) )
+				{
+					// When the length is 0 we're adding the first item so
+					// no comma is necessary
+					if ( s.length > 0 ) {
+						// We've already added an item, so add the comma separator
+						s += ","
+					}
+					
+					s += escapeString( v.@name.toString() ) + ":" 
+							+ convertToString( o[ v.@name ] );
+				}
+				
+			}
+			
+			return "{" + s + "}";
+		}
+
+		
+	}
+	
+}