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/*
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Adobe Systems Incorporated(r) Source Code License Agreement
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Copyright(c) 2005 Adobe Systems Incorporated. All rights reserved.
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Please read this Source Code License Agreement carefully before using
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the source code.
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Adobe Systems Incorporated grants to you a perpetual, worldwide, non-exclusive,
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no-charge, royalty-free, irrevocable copyright license, to reproduce,
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prepare derivative works of, publicly display, publicly perform, and
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distribute this source code and such derivative works in source or
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object code form without any attribution requirements.
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The name "Adobe Systems Incorporated" must not be used to endorse or promote products
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derived from the source code without prior written permission.
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You agree to indemnify, hold harmless and defend Adobe Systems Incorporated from and
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against any loss, damage, claims or lawsuits, including attorney's
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fees that arise or result from your use or distribution of the source
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code.
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THIS SOURCE CODE IS PROVIDED "AS IS" AND "WITH ALL FAULTS", WITHOUT
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ANY TECHNICAL SUPPORT OR ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
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BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE ARE DISCLAIMED. ALSO, THERE IS NO WARRANTY OF
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NON-INFRINGEMENT, TITLE OR QUIET ENJOYMENT. IN NO EVENT SHALL MACROMEDIA
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OR ITS SUPPLIERS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOURCE CODE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.adobe.serialization.json {
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public class JSONDecoder {
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/** The value that will get parsed from the JSON string */
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private var value:*;
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/** The tokenizer designated to read the JSON string */
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private var tokenizer:JSONTokenizer;
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/** The current token from the tokenizer */
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private var token:JSONToken;
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/**
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* Constructs a new JSONDecoder to parse a JSON string
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* into a native object.
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*
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* @param s The JSON string to be converted
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* into a native object
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* @langversion ActionScript 3.0
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* @playerversion Flash 9.0
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* @tiptext
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*/
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public function JSONDecoder( s:String ) {
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tokenizer = new JSONTokenizer( s );
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nextToken();
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value = parseValue();
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}
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/**
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* Gets the internal object that was created by parsing
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* the JSON string passed to the constructor.
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*
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* @return The internal object representation of the JSON
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* string that was passed to the constructor
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* @langversion ActionScript 3.0
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* @playerversion Flash 9.0
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* @tiptext
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*/
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public function getValue():* {
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return value;
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}
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/**
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* Returns the next token from the tokenzier reading
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* the JSON string
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*/
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private function nextToken():JSONToken {
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return token = tokenizer.getNextToken();
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}
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/**
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* Attempt to parse an array
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*/
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private function parseArray():Array {
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// create an array internally that we're going to attempt
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// to parse from the tokenizer
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var a:Array = new Array();
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// grab the next token from the tokenizer to move
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// past the opening [
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nextToken();
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// check to see if we have an empty array
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if ( token.type == JSONTokenType.RIGHT_BRACKET ) {
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// we're done reading the array, so return it
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return a;
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}
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// deal with elements of the array, and use an "infinite"
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// loop because we could have any amount of elements
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while ( true ) {
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// read in the value and add it to the array
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a.push ( parseValue() );
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// after the value there should be a ] or a ,
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nextToken();
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if ( token.type == JSONTokenType.RIGHT_BRACKET ) {
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// we're done reading the array, so return it
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return a;
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} else if ( token.type == JSONTokenType.COMMA ) {
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// move past the comma and read another value
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nextToken();
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} else {
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tokenizer.parseError( "Expecting ] or , but found " + token.value );
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}
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}
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return null;
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}
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/**
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* Attempt to parse an object
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*/
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private function parseObject():Object {
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// create the object internally that we're going to
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// attempt to parse from the tokenizer
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var o:Object = new Object();
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// store the string part of an object member so
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// that we can assign it a value in the object
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var key:String
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// grab the next token from the tokenizer
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nextToken();
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// check to see if we have an empty object
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if ( token.type == JSONTokenType.RIGHT_BRACE ) {
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// we're done reading the object, so return it
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return o;
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}
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// deal with members of the object, and use an "infinite"
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// loop because we could have any amount of members
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while ( true ) {
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if ( token.type == JSONTokenType.STRING ) {
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// the string value we read is the key for the object
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key = String( token.value );
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// move past the string to see what's next
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nextToken();
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// after the string there should be a :
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if ( token.type == JSONTokenType.COLON ) {
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// move past the : and read/assign a value for the key
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nextToken();
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o[key] = parseValue();
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// move past the value to see what's next
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nextToken();
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// after the value there's either a } or a ,
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if ( token.type == JSONTokenType.RIGHT_BRACE ) {
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// // we're done reading the object, so return it
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return o;
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} else if ( token.type == JSONTokenType.COMMA ) {
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// skip past the comma and read another member
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nextToken();
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} else {
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tokenizer.parseError( "Expecting } or , but found " + token.value );
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}
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} else {
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tokenizer.parseError( "Expecting : but found " + token.value );
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}
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} else {
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tokenizer.parseError( "Expecting string but found " + token.value );
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}
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}
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return null;
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}
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/**
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* Attempt to parse a value
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*/
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private function parseValue():Object {
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switch ( token.type ) {
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case JSONTokenType.LEFT_BRACE:
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return parseObject();
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case JSONTokenType.LEFT_BRACKET:
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return parseArray();
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case JSONTokenType.STRING:
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case JSONTokenType.NUMBER:
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case JSONTokenType.TRUE:
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case JSONTokenType.FALSE:
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case JSONTokenType.NULL:
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return token.value;
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default:
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tokenizer.parseError( "Unexpected " + token.value );
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}
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return null;
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}
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}
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}
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