Json.php

<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Json
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id$
 */

/**
 * Zend_Json_Expr.
 *
 * @see Zend_Json_Expr
 */
require_once 'Zend/Json/Expr.php';


/**
 * Class for encoding to and decoding from JSON.
 *
 * @category   Zend
 * @package    Zend_Json
 * @uses       Zend_Json_Expr
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Json
{
    /**
     * How objects should be encoded -- arrays or as StdClass. TYPE_ARRAY is 1
     * so that it is a boolean true value, allowing it to be used with
     * ext/json's functions.
     */
    const TYPE_ARRAY  = 1;
    const TYPE_OBJECT = 0;

     /**
      * To check the allowed nesting depth of the XML tree during xml2json conversion.
      *
      * @var int
      */
    public static $maxRecursionDepthAllowed=25;

    /**
     * @var bool
     */
    public static $useBuiltinEncoderDecoder = false;

    /**
     * Decodes the given $encodedValue string which is
     * encoded in the JSON format
     *
     * Uses ext/json's json_decode if available.
     *
     * @param string $encodedValue Encoded in JSON format
     * @param int $objectDecodeType Optional; flag indicating how to decode
     * objects. See {@link Zend_Json_Decoder::decode()} for details.
     * @return mixed
     */
    public static function decode($encodedValue, $objectDecodeType = Zend_Json::TYPE_ARRAY)
    {
        $encodedValue = (string) $encodedValue;
        if (function_exists('json_decode') && self::$useBuiltinEncoderDecoder !== true) {
            $decode = json_decode($encodedValue, $objectDecodeType);

            // php < 5.3
            if (!function_exists('json_last_error')) {
                if ($decode === $encodedValue) {
                    require_once 'Zend/Json/Exception.php';
                    throw new Zend_Json_Exception('Decoding failed');
                }
            // php >= 5.3
            } elseif (($jsonLastErr = json_last_error()) != JSON_ERROR_NONE) {
                require_once 'Zend/Json/Exception.php';
                switch ($jsonLastErr) {
                    case JSON_ERROR_DEPTH:
                        throw new Zend_Json_Exception('Decoding failed: Maximum stack depth exceeded');
                    case JSON_ERROR_CTRL_CHAR:
                        throw new Zend_Json_Exception('Decoding failed: Unexpected control character found');
                    case JSON_ERROR_SYNTAX:
                        throw new Zend_Json_Exception('Decoding failed: Syntax error');
                    default:
                        throw new Zend_Json_Exception('Decoding failed');
                }
            }

            return $decode;
        }

        require_once 'Zend/Json/Decoder.php';
        return Zend_Json_Decoder::decode($encodedValue, $objectDecodeType);
    }

    /**
     * Encode the mixed $valueToEncode into the JSON format
     *
     * Encodes using ext/json's json_encode() if available.
     *
     * NOTE: Object should not contain cycles; the JSON format
     * does not allow object reference.
     *
     * NOTE: Only public variables will be encoded
     *
     * NOTE: Encoding native javascript expressions are possible using Zend_Json_Expr.
     *       You can enable this by setting $options['enableJsonExprFinder'] = true
     *
     * @see Zend_Json_Expr
     *
     * @param  mixed $valueToEncode
     * @param  boolean $cycleCheck Optional; whether or not to check for object recursion; off by default
     * @param  array $options Additional options used during encoding
     * @return string JSON encoded object
     */
    public static function encode($valueToEncode, $cycleCheck = false, $options = array())
    {
        if (is_object($valueToEncode) && method_exists($valueToEncode, 'toJson')) {
            return $valueToEncode->toJson();
        }

        // Pre-encoding look for Zend_Json_Expr objects and replacing by tmp ids
        $javascriptExpressions = array();
        if(isset($options['enableJsonExprFinder'])
           && ($options['enableJsonExprFinder'] == true)
        ) {
            /**
             * @see Zend_Json_Encoder
             */
            require_once "Zend/Json/Encoder.php";
            $valueToEncode = self::_recursiveJsonExprFinder($valueToEncode, $javascriptExpressions);
        }

        // Encoding
        if (function_exists('json_encode') && self::$useBuiltinEncoderDecoder !== true) {
            $encodedResult = json_encode($valueToEncode);
        } else {
            require_once 'Zend/Json/Encoder.php';
            $encodedResult = Zend_Json_Encoder::encode($valueToEncode, $cycleCheck, $options);
        }

        //only do post-proccessing to revert back the Zend_Json_Expr if any.
        if (count($javascriptExpressions) > 0) {
            $count = count($javascriptExpressions);
            for($i = 0; $i < $count; $i++) {
                $magicKey = $javascriptExpressions[$i]['magicKey'];
                $value    = $javascriptExpressions[$i]['value'];

                $encodedResult = str_replace(
                    //instead of replacing "key:magicKey", we replace directly magicKey by value because "key" never changes.
                    '"' . $magicKey . '"',
                    $value,
                    $encodedResult
                );
            }
        }

         return $encodedResult;
    }

    /**
     * Check & Replace Zend_Json_Expr for tmp ids in the valueToEncode
     *
     * Check if the value is a Zend_Json_Expr, and if replace its value
     * with a magic key and save the javascript expression in an array.
     *
     * NOTE this method is recursive.
     *
     * NOTE: This method is used internally by the encode method.
     *
     * @see encode
     * @param array|object|Zend_Json_Expr $value a string - object property to be encoded
     * @param array $javascriptExpressions
     * @param null $currentKey
     *
     * @internal param mixed $valueToCheck
     * @return void
     */
    protected static function _recursiveJsonExprFinder(&$value, array &$javascriptExpressions, $currentKey = null)
    {
         if ($value instanceof Zend_Json_Expr) {
            // TODO: Optimize with ascii keys, if performance is bad
            $magicKey = "____" . $currentKey . "_" . (count($javascriptExpressions));
            $javascriptExpressions[] = array(

                //if currentKey is integer, encodeUnicodeString call is not required.
                "magicKey" => (is_int($currentKey)) ? $magicKey : Zend_Json_Encoder::encodeUnicodeString($magicKey),
                "value"    => $value->__toString(),
            );
            $value = $magicKey;
        } elseif (is_array($value)) {
            foreach ($value as $k => $v) {
                $value[$k] = self::_recursiveJsonExprFinder($value[$k], $javascriptExpressions, $k);
            }
        } elseif (is_object($value)) {
            foreach ($value as $k => $v) {
                $value->$k = self::_recursiveJsonExprFinder($value->$k, $javascriptExpressions, $k);
            }
        }
        return $value;
    }

    /**
     * Return the value of an XML attribute text or the text between
     * the XML tags
     *
     * In order to allow Zend_Json_Expr from xml, we check if the node
     * matchs the pattern that try to detect if it is a new Zend_Json_Expr
     * if it matches, we return a new Zend_Json_Expr instead of a text node
     *
     * @param SimpleXMLElement $simpleXmlElementObject
     * @return Zend_Json_Expr|string
     */
    protected static function _getXmlValue($simpleXmlElementObject) {
        $pattern = '/^[\s]*new Zend_Json_Expr[\s]*\([\s]*[\"\']{1}(.*)[\"\']{1}[\s]*\)[\s]*$/';
        $matchings = array();
        $match = preg_match ($pattern, $simpleXmlElementObject, $matchings);
        if ($match) {
            return new Zend_Json_Expr($matchings[1]);
        } else {
            return (trim(strval($simpleXmlElementObject)));
        }
    }
    /**
     * _processXml - Contains the logic for xml2json
     *
     * The logic in this function is a recursive one.
     *
     * The main caller of this function (i.e. fromXml) needs to provide
     * only the first two parameters i.e. the SimpleXMLElement object and
     * the flag for ignoring or not ignoring XML attributes. The third parameter
     * will be used internally within this function during the recursive calls.
     *
     * This function converts the SimpleXMLElement object into a PHP array by
     * calling a recursive (protected static) function in this class. Once all
     * the XML elements are stored in the PHP array, it is returned to the caller.
     *
     * Throws a Zend_Json_Exception if the XML tree is deeper than the allowed limit.
     *
     * @param SimpleXMLElement $simpleXmlElementObject
     * @param boolean $ignoreXmlAttributes
     * @param integer $recursionDepth
     * @return array
     */
    protected static function _processXml($simpleXmlElementObject, $ignoreXmlAttributes, $recursionDepth=0)
    {
        // Keep an eye on how deeply we are involved in recursion.
        if ($recursionDepth > self::$maxRecursionDepthAllowed) {
            // XML tree is too deep. Exit now by throwing an exception.
            require_once 'Zend/Json/Exception.php';
            throw new Zend_Json_Exception(
                "Function _processXml exceeded the allowed recursion depth of " .
                self::$maxRecursionDepthAllowed);
        } // End of if ($recursionDepth > self::$maxRecursionDepthAllowed)

        $children = $simpleXmlElementObject->children();
        $name = $simpleXmlElementObject->getName();
        $value = self::_getXmlValue($simpleXmlElementObject);
        $attributes = (array) $simpleXmlElementObject->attributes();

        if (count($children) == 0) {
            if (!empty($attributes) && !$ignoreXmlAttributes) {
                foreach ($attributes['@attributes'] as $k => $v) {
                    $attributes['@attributes'][$k]= self::_getXmlValue($v);
                }
                if (!empty($value)) {
                    $attributes['@text'] = $value;
                } 
                return array($name => $attributes);
            } else {
               return array($name => $value);
            }
        } else {
            $childArray= array();
            foreach ($children as $child) {
                $childname = $child->getName();
                $element = self::_processXml($child,$ignoreXmlAttributes,$recursionDepth+1);
                if (array_key_exists($childname, $childArray)) {
                    if (empty($subChild[$childname])) {
                        $childArray[$childname] = array($childArray[$childname]);
                        $subChild[$childname] = true;
                    }
                    $childArray[$childname][] = $element[$childname];
                } else {
                    $childArray[$childname] = $element[$childname];
                }
            }
            if (!empty($attributes) && !$ignoreXmlAttributes) {
                foreach ($attributes['@attributes'] as $k => $v) {
                    $attributes['@attributes'][$k] = self::_getXmlValue($v);
                }
                $childArray['@attributes'] = $attributes['@attributes'];
            }
            if (!empty($value)) {
                $childArray['@text'] = $value;
            }
            return array($name => $childArray);
        }
    }

    /**
     * fromXml - Converts XML to JSON
     *
     * Converts a XML formatted string into a JSON formatted string.
     * The value returned will be a string in JSON format.
     *
     * The caller of this function needs to provide only the first parameter,
     * which is an XML formatted String. The second parameter is optional, which
     * lets the user to select if the XML attributes in the input XML string
     * should be included or ignored in xml2json conversion.
     *
     * This function converts the XML formatted string into a PHP array by
     * calling a recursive (protected static) function in this class. Then, it
     * converts that PHP array into JSON by calling the "encode" static funcion.
     *
     * Throws a Zend_Json_Exception if the input not a XML formatted string.
     * NOTE: Encoding native javascript expressions via Zend_Json_Expr is not possible.
     *
     * @static
     * @access public
     * @param string $xmlStringContents XML String to be converted
     * @param boolean $ignoreXmlAttributes Include or exclude XML attributes in
     * the xml2json conversion process.
     * @return mixed - JSON formatted string on success
     * @throws Zend_Json_Exception
     */
    public static function fromXml($xmlStringContents, $ignoreXmlAttributes=true)
    {
        // Load the XML formatted string into a Simple XML Element object.
        $simpleXmlElementObject = simplexml_load_string($xmlStringContents);

        // If it is not a valid XML content, throw an exception.
        if ($simpleXmlElementObject == null) {
            require_once 'Zend/Json/Exception.php';
            throw new Zend_Json_Exception('Function fromXml was called with an invalid XML formatted string.');
        } // End of if ($simpleXmlElementObject == null)

        $resultArray = null;

        // Call the recursive function to convert the XML into a PHP array.
        $resultArray = self::_processXml($simpleXmlElementObject, $ignoreXmlAttributes);

        // Convert the PHP array to JSON using Zend_Json encode method.
        // It is just that simple.
        $jsonStringOutput = self::encode($resultArray);
        return($jsonStringOutput);
    }

    

    /**
     * Pretty-print JSON string
     *
     * Use 'format' option to select output format - currently html and txt supported, txt is default
     * Use 'indent' option to override the indentation string set in the format - by default for the 'txt' format it's a tab
     *
     * @param string $json Original JSON string
     * @param array $options Encoding options
     * @return string
     */
    public static function prettyPrint($json, $options = array())
    {
        $tokens = preg_split('|([\{\}\]\[,])|', $json, -1, PREG_SPLIT_DELIM_CAPTURE);
        $result = '';
        $indent = 0;

        $format= 'txt';

        $ind = "\t";

        if (isset($options['format'])) {
            $format = $options['format'];
        }

        switch ($format) {
            case 'html':
                $lineBreak = '<br />';
                $ind = '&nbsp;&nbsp;&nbsp;&nbsp;';
                break;
            default:
            case 'txt':
                $lineBreak = "\n";
                $ind = "\t";
                break;
        }

        // override the defined indent setting with the supplied option
        if (isset($options['indent'])) {
            $ind = $options['indent'];
        }

        $inLiteral = false;
        foreach($tokens as $token) {
            if($token == '') {
                continue;
            }

            $prefix = str_repeat($ind, $indent);
            if (!$inLiteral && ($token == '{' || $token == '[')) {
                $indent++;
                if (($result != '') && ($result[(strlen($result)-1)] == $lineBreak)) {
                    $result .= $prefix;
                }
                $result .= $token . $lineBreak;
            } elseif (!$inLiteral && ($token == '}' || $token == ']')) {
                $indent--;
                $prefix = str_repeat($ind, $indent);
                $result .= $lineBreak . $prefix . $token;
            } elseif (!$inLiteral && $token == ',') {
                $result .= $token . $lineBreak;
            } else {
                $result .= ( $inLiteral ? '' : $prefix ) . $token;
                
                // Count # of unescaped double-quotes in token, subtract # of
                // escaped double-quotes and if the result is odd then we are 
                // inside a string literal
                if ((substr_count($token, "\"")-substr_count($token, "\\\"")) % 2 != 0) {
                    $inLiteral = !$inLiteral;
                }
            }
        }
        return $result;
   }
}