1: <?php
  2: 
  3: /**
  4:  * This file is part of the Nette Framework (https://nette.org)
  5:  * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
  6:  */
  7: 
  8: namespace Nette\Utils;
  9: 
 10: use Nette;
 11: 
 12: 
 13: /**
 14:  * JSON encoder and decoder.
 15:  */
 16: class Json
 17: {
 18:     const FORCE_ARRAY = 1;
 19:     const PRETTY = 2;
 20: 
 21:     /** @var array */
 22:     private static $messages = array(
 23:         JSON_ERROR_DEPTH => 'The maximum stack depth has been exceeded',
 24:         JSON_ERROR_STATE_MISMATCH => 'Syntax error, malformed JSON',
 25:         JSON_ERROR_CTRL_CHAR => 'Unexpected control character found',
 26:         JSON_ERROR_SYNTAX => 'Syntax error, malformed JSON',
 27:         5 /*JSON_ERROR_UTF8*/ => 'Invalid UTF-8 sequence', // exists since 5.3.3, but is returned since 5.3.1
 28:     );
 29: 
 30: 
 31:     /**
 32:      * Static class - cannot be instantiated.
 33:      */
 34:     final public function __construct()
 35:     {
 36:         throw new Nette\StaticClassException;
 37:     }
 38: 
 39: 
 40:     /**
 41:      * Returns the JSON representation of a value.
 42:      * @param  mixed
 43:      * @param  int  accepts Json::PRETTY
 44:      * @return string
 45:      */
 46:     public static function encode($value, $options = 0)
 47:     {
 48:         $flags = PHP_VERSION_ID >= 50400 ? (JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | ($options & self::PRETTY ? JSON_PRETTY_PRINT : 0)) : 0;
 49: 
 50:         if (PHP_VERSION_ID < 50500) {
 51:             $json = Callback::invokeSafe('json_encode', array($value, $flags), function ($message) { // needed to receive 'recursion detected' error
 52:                 throw new JsonException($message);
 53:             });
 54:         } else {
 55:             $json = json_encode($value, $flags);
 56:         }
 57: 
 58:         if ($error = json_last_error()) {
 59:             $message = isset(static::$messages[$error]) ? static::$messages[$error]
 60:                 : (PHP_VERSION_ID >= 50500 ? json_last_error_msg() : 'Unknown error');
 61:             throw new JsonException($message, $error);
 62:         }
 63: 
 64:         $json = str_replace(array("\xe2\x80\xa8", "\xe2\x80\xa9"), array('\u2028', '\u2029'), $json);
 65:         return $json;
 66:     }
 67: 
 68: 
 69:     /**
 70:      * Decodes a JSON string.
 71:      * @param  string
 72:      * @param  int  accepts Json::FORCE_ARRAY
 73:      * @return mixed
 74:      */
 75:     public static function decode($json, $options = 0)
 76:     {
 77:         $json = (string) $json;
 78:         if (!preg_match('##u', $json)) {
 79:             throw new JsonException('Invalid UTF-8 sequence', 5); // workaround for PHP < 5.3.3 & PECL JSON-C
 80:         }
 81: 
 82:         $forceArray = (bool) ($options & self::FORCE_ARRAY);
 83:         if (!$forceArray && preg_match('#(?<=[^\\\\]")\\\\u0000(?:[^"\\\\]|\\\\.)*+"\s*+:#', $json)) { // workaround for json_decode fatal error when object key starts with \u0000
 84:             throw new JsonException(static::$messages[JSON_ERROR_CTRL_CHAR]);
 85:         }
 86:         $args = array($json, $forceArray, 512);
 87:         if (PHP_VERSION_ID >= 50400 && !(defined('JSON_C_VERSION') && PHP_INT_SIZE > 4)) { // not implemented in PECL JSON-C 1.3.2 for 64bit systems
 88:             $args[] = JSON_BIGINT_AS_STRING;
 89:         }
 90:         $value = call_user_func_array('json_decode', $args);
 91: 
 92:         if ($value === NULL && $json !== '' && strcasecmp(trim($json, " \t\n\r"), 'null') !== 0) { // '' is not clearing json_last_error
 93:             $error = json_last_error();
 94:             throw new JsonException(isset(static::$messages[$error]) ? static::$messages[$error] : 'Unknown error', $error);
 95:         }
 96:         return $value;
 97:     }
 98: 
 99: }
100: