439 lines
12 KiB
PHP
439 lines
12 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Json
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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/**
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* Zend_Json_Exception
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*/
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require_once 'Zend/Json/Exception.php';
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/**
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* Encode PHP constructs to JSON
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*
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* @category Zend
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* @package Zend_Json
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Json_Encoder
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{
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/**
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* Whether or not to check for possible cycling
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*
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* @var boolean
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*/
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protected $_cycleCheck;
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/**
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* Additional options used during encoding
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*
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* @var array
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*/
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protected $_options = array();
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/**
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* Array of visited objects; used to prevent cycling.
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*
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* @var array
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*/
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protected $_visited = array();
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/**
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* Constructor
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*
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* @param boolean $cycleCheck Whether or not to check for recursion when encoding
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* @param array $options Additional options used during encoding
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* @return void
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*/
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protected function __construct($cycleCheck = false, $options = array())
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{
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$this->_cycleCheck = $cycleCheck;
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$this->_options = $options;
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}
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/**
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* Use the JSON encoding scheme for the value specified
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*
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* @param mixed $value The value to be encoded
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* @param boolean $cycleCheck Whether or not to check for possible object recursion when encoding
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* @param array $options Additional options used during encoding
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* @return string The encoded value
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*/
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public static function encode($value, $cycleCheck = false, $options = array())
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{
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$encoder = new self(($cycleCheck) ? true : false, $options);
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return $encoder->_encodeValue($value);
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}
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/**
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* Recursive driver which determines the type of value to be encoded
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* and then dispatches to the appropriate method. $values are either
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* - objects (returns from {@link _encodeObject()})
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* - arrays (returns from {@link _encodeArray()})
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* - basic datums (e.g. numbers or strings) (returns from {@link _encodeDatum()})
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*
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* @param $value mixed The value to be encoded
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* @return string Encoded value
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*/
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protected function _encodeValue(&$value)
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{
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if (is_object($value)) {
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return $this->_encodeObject($value);
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} else if (is_array($value)) {
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return $this->_encodeArray($value);
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}
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return $this->_encodeDatum($value);
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}
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/**
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* Encode an object to JSON by encoding each of the public properties
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*
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* A special property is added to the JSON object called '__className'
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* that contains the name of the class of $value. This is used to decode
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* the object on the client into a specific class.
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*
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* @param $value object
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* @return string
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* @throws Zend_Json_Exception If recursive checks are enabled and the object has been serialized previously
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*/
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protected function _encodeObject(&$value)
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{
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if ($this->_cycleCheck) {
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if ($this->_wasVisited($value)) {
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if (isset($this->_options['silenceCyclicalExceptions'])
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&& $this->_options['silenceCyclicalExceptions']===true) {
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return '"* RECURSION (' . get_class($value) . ') *"';
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} else {
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throw new Zend_Json_Exception(
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'Cycles not supported in JSON encoding, cycle introduced by '
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. 'class "' . get_class($value) . '"'
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);
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}
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}
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$this->_visited[] = $value;
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}
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$props = '';
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if ($value instanceof Iterator) {
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$propCollection = $value;
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} else {
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$propCollection = get_object_vars($value);
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}
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foreach ($propCollection as $name => $propValue) {
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if (isset($propValue)) {
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$props .= ','
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. $this->_encodeValue($name)
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. ':'
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. $this->_encodeValue($propValue);
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}
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}
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return '{"__className":"' . get_class($value) . '"'
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. $props . '}';
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}
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/**
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* Determine if an object has been serialized already
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*
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* @param mixed $value
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* @return boolean
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*/
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protected function _wasVisited(&$value)
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{
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if (in_array($value, $this->_visited, true)) {
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return true;
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}
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return false;
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}
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/**
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* JSON encode an array value
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*
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* Recursively encodes each value of an array and returns a JSON encoded
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* array string.
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*
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* Arrays are defined as integer-indexed arrays starting at index 0, where
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* the last index is (count($array) -1); any deviation from that is
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* considered an associative array, and will be encoded as such.
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*
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* @param $array array
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* @return string
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*/
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protected function _encodeArray(&$array)
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{
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$tmpArray = array();
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// Check for associative array
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if (!empty($array) && (array_keys($array) !== range(0, count($array) - 1))) {
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// Associative array
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$result = '{';
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foreach ($array as $key => $value) {
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$key = (string) $key;
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$tmpArray[] = $this->_encodeString($key)
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. ':'
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. $this->_encodeValue($value);
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}
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$result .= implode(',', $tmpArray);
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$result .= '}';
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} else {
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// Indexed array
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$result = '[';
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$length = count($array);
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for ($i = 0; $i < $length; $i++) {
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$tmpArray[] = $this->_encodeValue($array[$i]);
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}
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$result .= implode(',', $tmpArray);
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$result .= ']';
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}
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return $result;
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}
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/**
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* JSON encode a basic data type (string, number, boolean, null)
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*
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* If value type is not a string, number, boolean, or null, the string
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* 'null' is returned.
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*
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* @param $value mixed
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* @return string
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*/
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protected function _encodeDatum(&$value)
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{
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$result = 'null';
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if (is_int($value) || is_float($value)) {
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$result = (string) $value;
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} elseif (is_string($value)) {
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$result = $this->_encodeString($value);
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} elseif (is_bool($value)) {
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$result = $value ? 'true' : 'false';
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}
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return $result;
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}
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/**
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* JSON encode a string value by escaping characters as necessary
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*
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* @param $value string
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* @return string
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*/
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protected function _encodeString(&$string)
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{
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// Escape these characters with a backslash:
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// " \ / \n \r \t \b \f
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$search = array('\\', "\n", "\t", "\r", "\b", "\f", '"');
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$replace = array('\\\\', '\\n', '\\t', '\\r', '\\b', '\\f', '\"');
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$string = str_replace($search, $replace, $string);
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// Escape certain ASCII characters:
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// 0x08 => \b
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// 0x0c => \f
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$string = str_replace(array(chr(0x08), chr(0x0C)), array('\b', '\f'), $string);
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return '"' . $string . '"';
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}
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/**
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* Encode the constants associated with the ReflectionClass
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* parameter. The encoding format is based on the class2 format
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*
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* @param $cls ReflectionClass
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* @return string Encoded constant block in class2 format
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*/
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private static function _encodeConstants(ReflectionClass $cls)
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{
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$result = "constants : {";
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$constants = $cls->getConstants();
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$tmpArray = array();
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if (!empty($constants)) {
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foreach ($constants as $key => $value) {
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$tmpArray[] = "$key: " . self::encode($value);
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}
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$result .= implode(', ', $tmpArray);
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}
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return $result . "}";
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}
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/**
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* Encode the public methods of the ReflectionClass in the
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* class2 format
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*
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* @param $cls ReflectionClass
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* @return string Encoded method fragment
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*
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*/
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private static function _encodeMethods(ReflectionClass $cls)
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{
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$methods = $cls->getMethods();
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$result = 'methods:{';
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$started = false;
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foreach ($methods as $method) {
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if (! $method->isPublic() || !$method->isUserDefined()) {
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continue;
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}
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if ($started) {
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$result .= ',';
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}
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$started = true;
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$result .= '' . $method->getName(). ':function(';
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if ('__construct' != $method->getName()) {
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$parameters = $method->getParameters();
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$paramCount = count($parameters);
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$argsStarted = false;
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$argNames = "var argNames=[";
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foreach ($parameters as $param) {
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if ($argsStarted) {
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$result .= ',';
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}
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$result .= $param->getName();
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if ($argsStarted) {
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$argNames .= ',';
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}
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$argNames .= '"' . $param->getName() . '"';
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$argsStarted = true;
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}
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$argNames .= "];";
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$result .= "){"
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. $argNames
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. 'var result = ZAjaxEngine.invokeRemoteMethod('
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. "this, '" . $method->getName()
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. "',argNames,arguments);"
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. 'return(result);}';
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} else {
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$result .= "){}";
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}
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}
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return $result . "}";
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}
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/**
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* Encode the public properties of the ReflectionClass in the class2
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* format.
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*
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* @param $cls ReflectionClass
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* @return string Encode properties list
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*
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*/
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private static function _encodeVariables(ReflectionClass $cls)
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{
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$properties = $cls->getProperties();
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$propValues = get_class_vars($cls->getName());
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$result = "variables:{";
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$cnt = 0;
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$tmpArray = array();
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foreach ($properties as $prop) {
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if (! $prop->isPublic()) {
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continue;
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}
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$tmpArray[] = $prop->getName()
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. ':'
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. self::encode($propValues[$prop->getName()]);
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}
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$result .= implode(',', $tmpArray);
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return $result . "}";
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}
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/**
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* Encodes the given $className into the class2 model of encoding PHP
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* classes into JavaScript class2 classes.
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* NOTE: Currently only public methods and variables are proxied onto
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* the client machine
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*
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* @param $className string The name of the class, the class must be
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* instantiable using a null constructor
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* @param $package string Optional package name appended to JavaScript
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* proxy class name
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* @return string The class2 (JavaScript) encoding of the class
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* @throws Zend_Json_Exception
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*/
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public static function encodeClass($className, $package = '')
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{
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$cls = new ReflectionClass($className);
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if (! $cls->isInstantiable()) {
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throw new Zend_Json_Exception("$className must be instantiable");
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}
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return "Class.create('$package$className',{"
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. self::_encodeConstants($cls) .","
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. self::_encodeMethods($cls) .","
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. self::_encodeVariables($cls) .'});';
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}
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/**
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* Encode several classes at once
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*
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* Returns JSON encoded classes, using {@link encodeClass()}.
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*
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* @param array $classNames
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* @param string $package
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* @return string
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*/
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public static function encodeClasses(array $classNames, $package = '')
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{
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$result = '';
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foreach ($classNames as $className) {
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$result .= self::encodeClass($className, $package);
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}
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return $result;
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}
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}
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