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<?php
/**
* TJavaScript class file
*
* @author Wei Zhuo<weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2008 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Web.Javascripts
*/
/**
* TJavaScript class.
*
* TJavaScript is a utility class containing commonly-used javascript-related
* functions.
*
* @author Wei Zhuo<weizhuo[at]gmail[dot]com>
* @version $Id$
* @package System.Web.Javascripts
* @since 3.0
*/
class TJavaScript
{
/**
* @var TJSON JSON decoder and encoder instance
*/
private static $_json;
/**
* Renders a list of javascript files
* @param array URLs to the javascript files
* @return string rendering result
*/
public static function renderScriptFiles($files)
{
$str='';
foreach($files as $file)
$str.= self::renderScriptFile($file);
return $str;
}
/**
* Renders a javascript file
* @param string URL to the javascript file
* @return string rendering result
*/
public static function renderScriptFile($file)
{
return '<script type="text/javascript" src="'.THttpUtility::htmlEncode($file)."\"></script>\n";
}
/**
* Renders a list of javascript blocks
* @param array javascript blocks
* @return string rendering result
*/
public static function renderScriptBlocks($scripts)
{
if(count($scripts))
return "<script type=\"text/javascript\">\n/*<![CDATA[*/\n".implode("\n",$scripts)."\n/*]]>*/\n</script>\n";
else
return '';
}
/**
* Renders javascript block
* @param string javascript block
* @return string rendering result
*/
public static function renderScriptBlock($script)
{
return "<script type=\"text/javascript\">\n/*<![CDATA[*/\n{$script}\n/*]]>*/\n</script>\n";
}
/**
* 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 string to be quoted
* @param boolean whether this string is used as a URL
* @return string the quoted string
*/
public static function quoteString($js,$forUrl=false)
{
if($forUrl)
return strtr($js,array('%'=>'%25',"\t"=>'\t',"\n"=>'\n',"\r"=>'\r','"'=>'\"','\''=>'\\\'','\\'=>'\\\\'));
else
return strtr($js,array("\t"=>'\t',"\n"=>'\n',"\r"=>'\r','"'=>'\"','\''=>'\\\'','\\'=>'\\\\'));
}
/**
* @return string considers the string as raw javascript function code
*/
public static function quoteFunction($js)
{
if(self::isFunction($js))
return $js;
else
return 'javascript:'.$js;
}
/**
* @return boolean true if string is raw javascript function code, i.e., if
* the string begins with <tt>javascript:</tt>
*/
public static function isFunction($js)
{
return preg_match('/^\s*javascript:/i', $js);
}
/**
* Encodes a PHP variable into javascript representation.
*
* Example:
* <code>
* $options['onLoading'] = "doit";
* $options['onComplete'] = "more";
* echo TJavaScript::encode($options);
* //expects the following javascript code
* // {'onLoading':'doit','onComplete':'more'}
* </code>
*
* For higher complexity data structures use {@link jsonEncode} and {@link jsonDecode}
* to serialize and unserialize.
*
* Note: strings begining with <tt>javascript:</tt> will be considered as
* raw javascript code and no encoding of that string will be enforced.
*
* @param mixed PHP variable to be encoded
* @param boolean whether the output is a map or a list.
* @return string the encoded string
*/
public static function encode($value,$toMap=true)
{
if(is_string($value))
{
if(($n=strlen($value))>2)
{
$first=$value[0];
$last=$value[$n-1];
if(($first==='[' && $last===']') || ($first==='{' && $last==='}'))
return $value;
}
// if string begins with javascript: return the raw string minus the prefix
if(self::isFunction($value))
return preg_replace('/^\s*javascript:/', '', $value);
else
return "'".self::quoteString($value)."'";
}
else if(is_bool($value))
return $value?'true':'false';
else if(is_array($value))
{
$results='';
if(($n=count($value))>0 && array_keys($value)!==range(0,$n-1))
{
foreach($value as $k=>$v)
{
if($v!=='')
{
if($results!=='')
$results.=',';
$results.="'$k':".self::encode($v,$toMap);
}
}
return '{'.$results.'}';
}
else
{
foreach($value as $v)
{
if($v!=='')
{
if($results!=='')
$results.=',';
$results.=self::encode($v,$toMap);
}
}
return '['.$results.']';
}
}
else if(is_integer($value))
return "$value";
else if(is_float($value))
{
if($value===-INF)
return 'Number.NEGATIVE_INFINITY';
else if($value===INF)
return 'Number.POSITIVE_INFINITY';
else
return "$value";
}
else if(is_object($value))
return self::encode(get_object_vars($value),$toMap);
else if($value===null)
return 'null';
else
return '';
}
/**
* Encodes a PHP variable into javascript string.
* This method invokes {@TJSON} utility class to perform the encoding.
* @param mixed variable to be encoded
* @return string encoded string
*/
public static function jsonEncode($value)
{
if(self::$_json === null)
self::$_json = Prado::createComponent('System.Web.Javascripts.TJSON');
return self::$_json->encode($value);
}
/**
* Decodes a javascript string into PHP variable.
* This method invokes {@TJSON} utility class to perform the decoding.
* @param string string to be decoded
* @return mixed decoded variable
*/
public static function jsonDecode($value)
{
if(self::$_json === null)
self::$_json = Prado::createComponent('System.Web.Javascripts.TJSON');
return self::$_json->decode($value);
}
}
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