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Diffstat (limited to 'vendors/uploadify/com/adobe/serialization/json/JSONEncoder.as')
-rw-r--r-- | vendors/uploadify/com/adobe/serialization/json/JSONEncoder.as | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/vendors/uploadify/com/adobe/serialization/json/JSONEncoder.as b/vendors/uploadify/com/adobe/serialization/json/JSONEncoder.as new file mode 100644 index 000000000..44469d053 --- /dev/null +++ b/vendors/uploadify/com/adobe/serialization/json/JSONEncoder.as @@ -0,0 +1,299 @@ +/*
+ 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 + "}";
+ }
+
+
+ }
+
+}
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