CJavaScript.php

<?php
/**
 * CJavaScript helper class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008-2011 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */


/**
 * CJavaScript is a helper class containing JavaScript-related handling functions.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package Yii
 */
class CJavaScript
{

    /**
     * Quotes a javascript string.
     * After processing, the string can be safely enclosed within a pair of
     * quotation marks and serve as a javascript string.
     * @param string $js string to be quoted
     * @param boolean $forUrl whether this string is used as a URL
     * @return string the quoted string
     */
    public static function quote($js, $forUrl = false)
    {
        if ($forUrl) {
            return strtr($js,
                         array('%'  => '%25', "\t" => '\t', "\n" => '\n', "\r" => '\r',
                '"'  => '\"', '\'' => '\\\'', '\\' => '\\\\', '</' => '<\/'));
        } else {
            return strtr($js,
                         array("\t" => '\t', "\n" => '\n', "\r" => '\r', '"'  => '\\"',
                '\'' => '\\\'', '\\' => '\\\\', '</' => '<\/'));
        }
    }

    /**
     * Encodes a PHP variable into javascript representation.
     *
     * Example:
     * <pre>
     * $options=array('key1'=>true,'key2'=>123,'key3'=>'value');
     * echo ACJavaScript::encode($options);
     * // The following javascript code would be generated:
     * // {"key1":true,"key2":123,"key3":"value"}
     * </pre>
     *
     * For highly complex data structures use {@link jsonEncode} and {@link jsonDecode}
     * to serialize and unserialize.
     *
     * @param mixed $value PHP variable to be encoded
     * @return string the encoded string
     */
    public static function encode($value)
    {
        if (is_string($value)) {
            if (strpos($value, 'js:') === 0) {
                return substr($value, 3);
            } else {
                return '"' . self::quote($value) . '"';
            }
        } else if ($value === null) {
            return 'null';
        } else if (is_bool($value)) {
            return $value ? 'true' : 'false';
        } else if (is_integer($value)) {
            return "$value";
        } else if (is_float($value)) {
            if ($value === -INF) {
                return 'Number.NEGATIVE_INFINITY';
            } else if ($value === INF) {
                return 'Number.POSITIVE_INFINITY';
            } else {
                return rtrim(sprintf('%.16F', $value), '0');  // locale-independent representation
            }
        } else if (is_object($value)) {
            return self::encode(get_object_vars($value));
        } else if (is_array($value)) {
            $es = array();
            if (($n  = count($value)) > 0 && array_keys($value) !== range(0, $n - 1)) {
                foreach ($value as $k => $v) {
                    $es[] = '"' . self::quote($k) . '":' . self::encode($v);
                }
                return '{' . implode(',', $es) . '}';
            } else {
                foreach ($value as $v) {
                    $es[] = self::encode($v);
                }
                return '[' . implode(',', $es) . ']';
            }
        } else {
            return '';
        }
    }

    /**
     * Returns the JSON representation of the PHP data.
     * @param mixed $data the data to be encoded
     * @return string the JSON representation of the PHP data.
     */
//    private static function jsonEncode($data)
//    {
//        return JSON::encode($data);
//    }

    /**
     * Decodes a JSON string.
     * @param string $data the data to be decoded
     * @param boolean $useArray whether to use associative array to represent object data
     * @return mixed the decoded PHP data
     */
//    private static function jsonDecode($data, $useArray = true)
//    {
//        return JSON::decode($data, $useArray);
//    }
}