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/framework/vendor/zend/Zend/Json.php

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PHP | 406 lines | 175 code | 37 blank | 194 comment | 55 complexity | 62715221d3b96e0ecdbb92a2397c3054 MD5 | raw file
  1<?php
  2/**
  3 * Zend Framework
  4 *
  5 * LICENSE
  6 *
  7 * This source file is subject to the new BSD license that is bundled
  8 * with this package in the file LICENSE.txt.
  9 * It is also available through the world-wide-web at this URL:
 10 * http://framework.zend.com/license/new-bsd
 11 * If you did not receive a copy of the license and are unable to
 12 * obtain it through the world-wide-web, please send an email
 13 * to license@zend.com so we can send you a copy immediately.
 14 *
 15 * @category   Zend
 16 * @package    Zend_Json
 17 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 18 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 19 * @version    $Id: Json.php 20616 2010-01-25 19:56:04Z matthew $
 20 */
 21
 22/**
 23 * Zend_Json_Expr.
 24 *
 25 * @see Zend_Json_Expr
 26 */
 27require_once 'Zend/Json/Expr.php';
 28
 29
 30/**
 31 * Class for encoding to and decoding from JSON.
 32 *
 33 * @category   Zend
 34 * @package    Zend_Json
 35 * @uses       Zend_Json_Expr
 36 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 37 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 38 */
 39class Zend_Json
 40{
 41    /**
 42     * How objects should be encoded -- arrays or as StdClass. TYPE_ARRAY is 1
 43     * so that it is a boolean true value, allowing it to be used with
 44     * ext/json's functions.
 45     */
 46    const TYPE_ARRAY  = 1;
 47    const TYPE_OBJECT = 0;
 48
 49     /**
 50      * To check the allowed nesting depth of the XML tree during xml2json conversion.
 51      *
 52      * @var int
 53      */
 54    public static $maxRecursionDepthAllowed=25;
 55
 56    /**
 57     * @var bool
 58     */
 59    public static $useBuiltinEncoderDecoder = false;
 60
 61    /**
 62     * Decodes the given $encodedValue string which is
 63     * encoded in the JSON format
 64     *
 65     * Uses ext/json's json_decode if available.
 66     *
 67     * @param string $encodedValue Encoded in JSON format
 68     * @param int $objectDecodeType Optional; flag indicating how to decode
 69     * objects. See {@link Zend_Json_Decoder::decode()} for details.
 70     * @return mixed
 71     */
 72    public static function decode($encodedValue, $objectDecodeType = Zend_Json::TYPE_ARRAY)
 73    {
 74        $encodedValue = (string) $encodedValue;
 75        if (function_exists('json_decode') && self::$useBuiltinEncoderDecoder !== true) {
 76            $decode = json_decode($encodedValue, $objectDecodeType);
 77
 78            // php < 5.3
 79            if (!function_exists('json_last_error')) {
 80                if ($decode === $encodedValue) {
 81                    require_once 'Zend/Json/Exception.php';
 82                    throw new Zend_Json_Exception('Decoding failed');
 83                }
 84            // php >= 5.3
 85            } elseif (($jsonLastErr = json_last_error()) != JSON_ERROR_NONE) {
 86                require_once 'Zend/Json/Exception.php';
 87                switch ($jsonLastErr) {
 88                    case JSON_ERROR_DEPTH:
 89                        throw new Zend_Json_Exception('Decoding failed: Maximum stack depth exceeded');
 90                    case JSON_ERROR_CTRL_CHAR:
 91                        throw new Zend_Json_Exception('Decoding failed: Unexpected control character found');
 92                    case JSON_ERROR_SYNTAX:
 93                        throw new Zend_Json_Exception('Decoding failed: Syntax error');
 94                    default:
 95                        throw new Zend_Json_Exception('Decoding failed');
 96                }
 97            }
 98
 99            return $decode;
100        }
101
102        require_once 'Zend/Json/Decoder.php';
103        return Zend_Json_Decoder::decode($encodedValue, $objectDecodeType);
104    }
105
106    /**
107     * Encode the mixed $valueToEncode into the JSON format
108     *
109     * Encodes using ext/json's json_encode() if available.
110     *
111     * NOTE: Object should not contain cycles; the JSON format
112     * does not allow object reference.
113     *
114     * NOTE: Only public variables will be encoded
115     *
116     * NOTE: Encoding native javascript expressions are possible using Zend_Json_Expr.
117     *       You can enable this by setting $options['enableJsonExprFinder'] = true
118     *
119     * @see Zend_Json_Expr
120     *
121     * @param  mixed $valueToEncode
122     * @param  boolean $cycleCheck Optional; whether or not to check for object recursion; off by default
123     * @param  array $options Additional options used during encoding
124     * @return string JSON encoded object
125     */
126    public static function encode($valueToEncode, $cycleCheck = false, $options = array())
127    {
128        if (is_object($valueToEncode) && method_exists($valueToEncode, 'toJson')) {
129            return $valueToEncode->toJson();
130        }
131
132        // Pre-encoding look for Zend_Json_Expr objects and replacing by tmp ids
133        $javascriptExpressions = array();
134        if(isset($options['enableJsonExprFinder'])
135           && ($options['enableJsonExprFinder'] == true)
136        ) {
137            /**
138             * @see Zend_Json_Encoder
139             */
140            require_once "Zend/Json/Encoder.php";
141            $valueToEncode = self::_recursiveJsonExprFinder($valueToEncode, $javascriptExpressions);
142        }
143
144        // Encoding
145        if (function_exists('json_encode') && self::$useBuiltinEncoderDecoder !== true) {
146            $encodedResult = json_encode($valueToEncode);
147        } else {
148            require_once 'Zend/Json/Encoder.php';
149            $encodedResult = Zend_Json_Encoder::encode($valueToEncode, $cycleCheck, $options);
150        }
151
152        //only do post-proccessing to revert back the Zend_Json_Expr if any.
153        if (count($javascriptExpressions) > 0) {
154            $count = count($javascriptExpressions);
155            for($i = 0; $i < $count; $i++) {
156                $magicKey = $javascriptExpressions[$i]['magicKey'];
157                $value    = $javascriptExpressions[$i]['value'];
158
159                $encodedResult = str_replace(
160                    //instead of replacing "key:magicKey", we replace directly magicKey by value because "key" never changes.
161                    '"' . $magicKey . '"',
162                    $value,
163                    $encodedResult
164                );
165            }
166        }
167
168         return $encodedResult;
169    }
170
171    /**
172     * Check & Replace Zend_Json_Expr for tmp ids in the valueToEncode
173     *
174     * Check if the value is a Zend_Json_Expr, and if replace its value
175     * with a magic key and save the javascript expression in an array.
176     *
177     * NOTE this method is recursive.
178     *
179     * NOTE: This method is used internally by the encode method.
180     *
181     * @see encode
182     * @param mixed $valueToCheck a string - object property to be encoded
183     * @return void
184     */
185    protected static function _recursiveJsonExprFinder(
186        &$value, array &$javascriptExpressions, $currentKey = null
187    ) {
188         if ($value instanceof Zend_Json_Expr) {
189            // TODO: Optimize with ascii keys, if performance is bad
190            $magicKey = "____" . $currentKey . "_" . (count($javascriptExpressions));
191            $javascriptExpressions[] = array(
192
193                //if currentKey is integer, encodeUnicodeString call is not required.
194                "magicKey" => (is_int($currentKey)) ? $magicKey : Zend_Json_Encoder::encodeUnicodeString($magicKey),
195                "value"    => $value->__toString(),
196            );
197            $value = $magicKey;
198        } elseif (is_array($value)) {
199            foreach ($value as $k => $v) {
200                $value[$k] = self::_recursiveJsonExprFinder($value[$k], $javascriptExpressions, $k);
201            }
202        } elseif (is_object($value)) {
203            foreach ($value as $k => $v) {
204                $value->$k = self::_recursiveJsonExprFinder($value->$k, $javascriptExpressions, $k);
205            }
206        }
207        return $value;
208    }
209
210    /**
211     * fromXml - Converts XML to JSON
212     *
213     * Converts a XML formatted string into a JSON formatted string.
214     * The value returned will be a string in JSON format.
215     *
216     * The caller of this function needs to provide only the first parameter,
217     * which is an XML formatted String. The second parameter is optional, which
218     * lets the user to select if the XML attributes in the input XML string
219     * should be included or ignored in xml2json conversion.
220     *
221     * This function converts the XML formatted string into a PHP array by
222     * calling a recursive (protected static) function in this class. Then, it
223     * converts that PHP array into JSON by calling the "encode" static funcion.
224     *
225     * Throws a Zend_Json_Exception if the input not a XML formatted string.
226     * NOTE: Encoding native javascript expressions via Zend_Json_Expr is not possible.
227     *
228     * @static
229     * @access public
230     * @param string $xmlStringContents XML String to be converted
231     * @param boolean $ignoreXmlAttributes Include or exclude XML attributes in
232     * the xml2json conversion process.
233     * @return mixed - JSON formatted string on success
234     * @throws Zend_Json_Exception
235     */
236    public static function fromXml ($xmlStringContents, $ignoreXmlAttributes=true) {
237        // Load the XML formatted string into a Simple XML Element object.
238        $simpleXmlElementObject = simplexml_load_string($xmlStringContents);
239
240        // If it is not a valid XML content, throw an exception.
241        if ($simpleXmlElementObject == null) {
242            require_once 'Zend/Json/Exception.php';
243            throw new Zend_Json_Exception('Function fromXml was called with an invalid XML formatted string.');
244        } // End of if ($simpleXmlElementObject == null)
245
246        $resultArray = null;
247
248        // Call the recursive function to convert the XML into a PHP array.
249        $resultArray = self::_processXml($simpleXmlElementObject, $ignoreXmlAttributes);
250
251        // Convert the PHP array to JSON using Zend_Json encode method.
252        // It is just that simple.
253        $jsonStringOutput = self::encode($resultArray);
254        return($jsonStringOutput);
255    } // End of function fromXml.
256
257    /**
258     * _processXml - Contains the logic for xml2json
259     *
260     * The logic in this function is a recursive one.
261     *
262     * The main caller of this function (i.e. fromXml) needs to provide
263     * only the first two parameters i.e. the SimpleXMLElement object and
264     * the flag for ignoring or not ignoring XML attributes. The third parameter
265     * will be used internally within this function during the recursive calls.
266     *
267     * This function converts the SimpleXMLElement object into a PHP array by
268     * calling a recursive (protected static) function in this class. Once all
269     * the XML elements are stored in the PHP array, it is returned to the caller.
270     *
271     * Throws a Zend_Json_Exception if the XML tree is deeper than the allowed limit.
272     *
273     * @static
274     * @access protected
275     * @param SimpleXMLElement $simpleXmlElementObject XML element to be converted
276     * @param boolean $ignoreXmlAttributes Include or exclude XML attributes in
277     * the xml2json conversion process.
278     * @param int $recursionDepth Current recursion depth of this function
279     * @return mixed - On success, a PHP associative array of traversed XML elements
280     * @throws Zend_Json_Exception
281     */
282    protected static function _processXml ($simpleXmlElementObject, $ignoreXmlAttributes, $recursionDepth=0) {
283        // Keep an eye on how deeply we are involved in recursion.
284        if ($recursionDepth > self::$maxRecursionDepthAllowed) {
285            // XML tree is too deep. Exit now by throwing an exception.
286            require_once 'Zend/Json/Exception.php';
287            throw new Zend_Json_Exception(
288                "Function _processXml exceeded the allowed recursion depth of " .
289                self::$maxRecursionDepthAllowed);
290        } // End of if ($recursionDepth > self::$maxRecursionDepthAllowed)
291
292        if ($recursionDepth == 0) {
293            // Store the original SimpleXmlElementObject sent by the caller.
294            // We will need it at the very end when we return from here for good.
295            $callerProvidedSimpleXmlElementObject = $simpleXmlElementObject;
296        } // End of if ($recursionDepth == 0)
297
298        if ($simpleXmlElementObject instanceof SimpleXMLElement) {
299            // Get a copy of the simpleXmlElementObject
300            $copyOfSimpleXmlElementObject = $simpleXmlElementObject;
301            // Get the object variables in the SimpleXmlElement object for us to iterate.
302            $simpleXmlElementObject = get_object_vars($simpleXmlElementObject);
303        } // End of if (get_class($simpleXmlElementObject) == "SimpleXMLElement")
304
305        // It needs to be an array of object variables.
306        if (is_array($simpleXmlElementObject)) {
307            // Initialize a result array.
308            $resultArray = array();
309            // Is the input array size 0? Then, we reached the rare CDATA text if any.
310            if (count($simpleXmlElementObject) <= 0) {
311                // Let us return the lonely CDATA. It could even be
312                // an empty element or just filled with whitespaces.
313                return (trim(strval($copyOfSimpleXmlElementObject)));
314            } // End of if (count($simpleXmlElementObject) <= 0)
315
316            // Let us walk through the child elements now.
317            foreach($simpleXmlElementObject as $key=>$value) {
318                // Check if we need to ignore the XML attributes.
319                // If yes, you can skip processing the XML attributes.
320                // Otherwise, add the XML attributes to the result array.
321                if(($ignoreXmlAttributes == true) && (is_string($key)) && ($key == "@attributes")) {
322                    continue;
323                } // End of if(($ignoreXmlAttributes == true) && ($key == "@attributes"))
324
325                // Let us recursively process the current XML element we just visited.
326                // Increase the recursion depth by one.
327                $recursionDepth++;
328                $resultArray[$key] = self::_processXml ($value, $ignoreXmlAttributes, $recursionDepth);
329
330                // Decrease the recursion depth by one.
331                $recursionDepth--;
332            } // End of foreach($simpleXmlElementObject as $key=>$value) {
333
334            if ($recursionDepth == 0) {
335                // That is it. We are heading to the exit now.
336                // Set the XML root element name as the root [top-level] key of
337                // the associative array that we are going to return to the original
338                // caller of this recursive function.
339                $tempArray = $resultArray;
340                $resultArray = array();
341                $resultArray[$callerProvidedSimpleXmlElementObject->getName()] = $tempArray;
342            } // End of if ($recursionDepth == 0)
343
344            return($resultArray);
345        } else {
346            // We are now looking at either the XML attribute text or
347            // the text between the XML tags.
348
349            // In order to allow Zend_Json_Expr from xml, we check if the node
350            // matchs the pattern that try to detect if it is a new Zend_Json_Expr
351            // if it matches, we return a new Zend_Json_Expr instead of a text node
352            $pattern = '/^[\s]*new Zend_Json_Expr[\s]*\([\s]*[\"\']{1}(.*)[\"\']{1}[\s]*\)[\s]*$/';
353            $matchings = array();
354            $match = preg_match ($pattern, $simpleXmlElementObject, $matchings);
355            if ($match) {
356                return new Zend_Json_Expr($matchings[1]);
357            } else {
358                return (trim(strval($simpleXmlElementObject)));
359            }
360
361        } // End of if (is_array($simpleXmlElementObject))
362    } // End of function _processXml.
363    
364    /**
365     * Pretty-print JSON string
366     * 
367     * Use 'indent' option to select indentation string - by default it's a tab
368     * 
369     * @param string $json Original JSON string
370     * @param array $options Encoding options
371     * @return string
372     */
373    public static function prettyPrint($json, $options = array())
374    {
375        $tokens = preg_split('|([\{\}\]\[,])|', $json, -1, PREG_SPLIT_DELIM_CAPTURE);
376        $result = "";
377        $indent = 0;
378        
379        $ind = "\t";
380        if(isset($options['indent'])) {
381            $ind = $options['indent'];
382        }
383        
384        foreach($tokens as $token) {
385            if($token == "") continue;
386            
387            $prefix = str_repeat($ind, $indent);
388            if($token == "{" || $token == "[") {
389                $indent++;
390                if($result != "" && $result[strlen($result)-1] == "\n") {
391                    $result .= $prefix;
392                }
393                $result .= "$token\n";
394            } else if($token == "}" || $token == "]") {
395                $indent--;
396                $prefix = str_repeat($ind, $indent);
397                $result .= "\n$prefix$token";                
398            } else if($token == ",") {
399                $result .= "$token\n";
400            } else {
401                $result .= $prefix.$token;
402            }
403        }
404        return $result;
405   }
406}