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 <?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_Config
  * @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
  * @license   http://framework.zend.com/license/new-bsd     New BSD License
  * @version   $Id$
  */
 
 /**
  * @see Zend_Config
  */
 // require_once 'Zend/Config.php';
 
 /**
  * @see Zend_Json
  */
 // require_once 'Zend/Json.php';
 
 /**
  * JSON Adapter for Zend_Config
  *
  * @category  Zend
  * @package   Zend_Config
  * @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
  * @license   http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Config_Json extends Zend_Config
 {
     /**
      * Name of object key indicating section current section extends
      */
     const EXTENDS_NAME = "_extends";
 
     /**
      * Whether or not to ignore constants in the JSON string
      *
      * Note: if you do not have constant names in quotations in your JSON
      * string, they may lead to syntax errors when parsing.
      *
      * @var bool
      */
     protected $_ignoreConstants = false;
 
     /**
      * Whether to skip extends or not
      *
      * @var boolean
      */
     protected $_skipExtends = false;
 
     /**
      * Loads the section $section from the config file encoded as JSON
      *
      * Sections are defined as properties of the main object
      *
      * In order to extend another section, a section defines the "_extends"
      * property having a value of the section name from which the extending
      * section inherits values.
      *
      * Note that the keys in $section will override any keys of the same
      * name in the sections that have been included via "_extends".
      *
      * @param  string  $json     JSON file or string to process
      * @param  mixed   $section Section to process
      * @param  boolean $options Whether modifiacations are allowed at runtime
      * @throws Zend_Config_Exception When JSON text is not set or cannot be loaded
      * @throws Zend_Config_Exception When section $sectionName cannot be found in $json
      */
     public function __construct($json, $section = null, $options = false)
     {
         if (empty($json)) {
             // require_once 'Zend/Config/Exception.php';
             throw new Zend_Config_Exception('Filename is not set');
         }
 
         $allowModifications = false;
         if (is_bool($options)) {
             $allowModifications = $options;
         } elseif (is_array($options)) {
             foreach ($options as $key => $value) {
                 switch (strtolower($key)) {
                     case 'allow_modifications':
                     case 'allowmodifications':
                         $allowModifications = (bool) $value;
                         break;
                     case 'skip_extends':
                     case 'skipextends':
                         $this->_skipExtends = (bool) $value;
                         break;
                     case 'ignore_constants':
                     case 'ignoreconstants':
                         $this->_ignoreConstants = (bool) $value;
                         break;
                     default:
                         break;
                 }
             }
         }
 
         set_error_handler(array($this, '_loadFileErrorHandler')); // Warnings and errors are suppressed
         if ($json[0] != '{') {
             $json = file_get_contents($json);
         }
         restore_error_handler();
 
         // Check if there was a error while loading file
         if ($this->_loadFileErrorStr !== null) {
             // require_once 'Zend/Config/Exception.php';
             throw new Zend_Config_Exception($this->_loadFileErrorStr);
         }
 
         // Replace constants
         if (!$this->_ignoreConstants) {
             $json = $this->_replaceConstants($json);
         }
 
         // Parse/decode
         try {
             $config = Zend_Json::decode($json);
         } catch (Zend_Json_Exception $e) {
             // decode failed
             // require_once 'Zend/Config/Exception.php';
             throw new Zend_Config_Exception("Error parsing JSON data");
         }
 
         if ($section === null) {
             $dataArray = array();
             foreach ($config as $sectionName => $sectionData) {
                 $dataArray[$sectionName] = $this->_processExtends($config, $sectionName);
             }
 
             parent::__construct($dataArray, $allowModifications);
         } elseif (is_array($section)) {
             $dataArray = array();
             foreach ($section as $sectionName) {
                 if (!isset($config[$sectionName])) {
                     // require_once 'Zend/Config/Exception.php';
                     throw new Zend_Config_Exception(sprintf('Section "%s" cannot be found', $sectionName));
                 }
 
                 $dataArray = array_merge($this->_processExtends($config, $sectionName), $dataArray);
             }
 
             parent::__construct($dataArray, $allowModifications);
         } else {
             if (!isset($config[$section])) {
                 // require_once 'Zend/Config/Exception.php';
                 throw new Zend_Config_Exception(sprintf('Section "%s" cannot be found', $section));
             }
 
             $dataArray = $this->_processExtends($config, $section);
             if (!is_array($dataArray)) {
                 // Section in the JSON data contains just one top level string
                 $dataArray = array($section => $dataArray);
             }
 
             parent::__construct($dataArray, $allowModifications);
         }
 
         $this->_loadedSection = $section;
     }
 
     /**
      * Helper function to process each element in the section and handle
      * the "_extends" inheritance attribute.
      *
      * @param  array            $data Data array to process
      * @param  string           $section Section to process
      * @param  array            $config  Configuration which was parsed yet
      * @throws Zend_Config_Exception When $section cannot be found
      * @return array
      */
     protected function _processExtends(array $data, $section, array $config = array())
     {
         if (!isset($data[$section])) {
             // require_once 'Zend/Config/Exception.php';
             throw new Zend_Config_Exception(sprintf('Section "%s" cannot be found', $section));
         }
 
         $thisSection  = $data[$section];
 
         if (is_array($thisSection) && isset($thisSection[self::EXTENDS_NAME])) {
             if (is_array($thisSection[self::EXTENDS_NAME])) {
                 // require_once 'Zend/Config/Exception.php';
                 throw new Zend_Config_Exception('Invalid extends clause: must be a string; array received');
             }
             $this->_assertValidExtend($section, $thisSection[self::EXTENDS_NAME]);
 
             if (!$this->_skipExtends) {
                 $config = $this->_processExtends($data, $thisSection[self::EXTENDS_NAME], $config);
             }
             unset($thisSection[self::EXTENDS_NAME]);
         }
 
         $config = $this->_arrayMergeRecursive($config, $thisSection);
 
         return $config;
     }
 
     /**
      * Replace any constants referenced in a string with their values
      *
      * @param  string $value
      * @return string
      */
     protected function _replaceConstants($value)
     {
         foreach ($this->_getConstants() as $constant) {
             if (strstr($value, $constant)) {
                 // handle backslashes that may represent windows path names for instance
                 $replacement = str_replace('\\', '\\\\', constant($constant));
                 $value = str_replace($constant, $replacement, $value);
             }
         }
         return $value;
     }
 
     /**
      * Get (reverse) sorted list of defined constant names
      *
      * @return array
      */
     protected function _getConstants()
     {
         $constants = array_keys(get_defined_constants());
         rsort($constants, SORT_STRING);
         return $constants;
     }
 }