CClientScript

public function addPackage($name,$definition)
{
    $this->packages[$name]=$definition;
    return $this;
}

public function getCoreScriptUrl()
{
    if($this->_baseUrl!==null)
        return $this->_baseUrl;
    else
        return $this->_baseUrl=Yii::app()->getAssetManager()->publish(YII_PATH.'/web/js/source');
}

public function getPackageBaseUrl($name)
{
    if(!isset($this->coreScripts[$name]))
        return false;
    $package=$this->coreScripts[$name];
    if(isset($package['baseUrl']))
    {
        $baseUrl=$package['baseUrl'];
        if($baseUrl==='' || $baseUrl[0]!=='/' && strpos($baseUrl,'://')===false)
            $baseUrl=Yii::app()->getRequest()->getBaseUrl().'/'.$baseUrl;
        $baseUrl=rtrim($baseUrl,'/');
    }
    else if(isset($package['basePath']))
        $baseUrl=Yii::app()->getAssetManager()->publish(Yii::getPathOfAlias($package['basePath']));
    else
        $baseUrl=$this->getCoreScriptUrl();

    return $this->coreScripts[$name]['baseUrl']=$baseUrl;
}

public function isCssFileRegistered($url)
{
    return isset($this->cssFiles[$url]);
}

public function isCssRegistered($id)
{
    return isset($this->css[$id]);
}

public function isScriptFileRegistered($url,$position=self::POS_HEAD)
{
    return isset($this->scriptFiles[$position][$url]);
}

public function isScriptRegistered($id,$position=self::POS_READY)
{
    return isset($this->scripts[$position][$id]);
}

protected function recordCachingAction($context,$method,$params)
{
    if(($controller=Yii::app()->getController())!==null)
        $controller->recordCachingAction($context,$method,$params);
}

public function registerCoreScript($name)
{
    if(isset($this->coreScripts[$name]))
        return $this;
    if(isset($this->packages[$name]))
        $package=$this->packages[$name];
    else
    {
        if($this->corePackages===null)
            $this->corePackages=require(YII_PATH.'/web/js/packages.php');
        if(isset($this->corePackages[$name]))
            $package=$this->corePackages[$name];
    }
    if(isset($package))
    {
        if(!empty($package['depends']))
        {
            foreach($package['depends'] as $p)
                $this->registerCoreScript($p);
        }
        $this->coreScripts[$name]=$package;
        $this->hasScripts=true;
        $params=func_get_args();
        $this->recordCachingAction('clientScript','registerCoreScript',$params);
    }
    return $this;
}

public function registerCss($id,$css,$media='')
{
    $this->hasScripts=true;
    $this->css[$id]=array($css,$media);
    $params=func_get_args();
    $this->recordCachingAction('clientScript','registerCss',$params);
    return $this;
}

public function registerCssFile($url,$media='')
{
    $this->hasScripts=true;
    $this->cssFiles[$url]=$media;
    $params=func_get_args();
    $this->recordCachingAction('clientScript','registerCssFile',$params);
    return $this;
}

public function registerLinkTag($relation=null,$type=null,$href=null,$media=null,$options=array())
{
    $this->hasScripts=true;
    if($relation!==null)
        $options['rel']=$relation;
    if($type!==null)
        $options['type']=$type;
    if($href!==null)
        $options['href']=$href;
    if($media!==null)
        $options['media']=$media;
    $this->linkTags[serialize($options)]=$options;
    $params=func_get_args();
    $this->recordCachingAction('clientScript','registerLinkTag',$params);
    return $this;
}

public function registerMetaTag($content,$name=null,$httpEquiv=null,$options=array())
{
    $this->hasScripts=true;
    if($name!==null)
        $options['name']=$name;
    if($httpEquiv!==null)
        $options['http-equiv']=$httpEquiv;
    $options['content']=$content;
    $this->metaTags[serialize($options)]=$options;
    $params=func_get_args();
    $this->recordCachingAction('clientScript','registerMetaTag',$params);
    return $this;
}

public function registerPackage($name)
{
    return $this->registerCoreScript($name);
}

public function registerScript($id,$script,$position=self::POS_READY)
{
    $this->hasScripts=true;
    $this->scripts[$position][$id]=$script;
    if($position===self::POS_READY || $position===self::POS_LOAD)
        $this->registerCoreScript('jquery');
    $params=func_get_args();
    $this->recordCachingAction('clientScript','registerScript',$params);
    return $this;
}

public function registerScriptFile($url,$position=self::POS_HEAD)
{
    $this->hasScripts=true;
    $this->scriptFiles[$position][$url]=$url;
    $params=func_get_args();
    $this->recordCachingAction('clientScript','registerScriptFile',$params);
    return $this;
}

protected function remapScripts()
{
    $cssFiles=array();
    foreach($this->cssFiles as $url=>$media)
    {
        $name=basename($url);
        if(isset($this->scriptMap[$name]))
        {
            if($this->scriptMap[$name]!==false)
                $cssFiles[$this->scriptMap[$name]]=$media;
        }
        else if(isset($this->scriptMap['*.css']))
        {
            if($this->scriptMap['*.css']!==false)
                $cssFiles[$this->scriptMap['*.css']]=$media;
        }
        else
            $cssFiles[$url]=$media;
    }
    $this->cssFiles=$cssFiles;

    $jsFiles=array();
    foreach($this->scriptFiles as $position=>$scripts)
    {
        $jsFiles[$position]=array();
        foreach($scripts as $key=>$script)
        {
            $name=basename($script);
            if(isset($this->scriptMap[$name]))
            {
                if($this->scriptMap[$name]!==false)
                    $jsFiles[$position][$this->scriptMap[$name]]=$this->scriptMap[$name];
            }
            else if(isset($this->scriptMap['*.js']))
            {
                if($this->scriptMap['*.js']!==false)
                    $jsFiles[$position][$this->scriptMap['*.js']]=$this->scriptMap['*.js'];
            }
            else
                $jsFiles[$position][$key]=$script;
        }
    }
    $this->scriptFiles=$jsFiles;
}

public function render(&$output)
{
    if(!$this->hasScripts)
        return;

    $this->renderCoreScripts();

    if(!empty($this->scriptMap))
        $this->remapScripts();

    $this->unifyScripts();

    $this->renderHead($output);
    if($this->enableJavaScript)
    {
        $this->renderBodyBegin($output);
        $this->renderBodyEnd($output);
    }
}

public function renderBodyBegin(&$output)
{
    $html='';
    if(isset($this->scriptFiles[self::POS_BEGIN]))
    {
        foreach($this->scriptFiles[self::POS_BEGIN] as $scriptFile)
            $html.=CHtml::scriptFile($scriptFile)."\n";
    }
    if(isset($this->scripts[self::POS_BEGIN]))
        $html.=CHtml::script(implode("\n",$this->scripts[self::POS_BEGIN]))."\n";

    if($html!=='')
    {
        $count=0;
        $output=preg_replace('/(<body\b[^>]*>)/is','$1<###begin###>',$output,1,$count);
        if($count)
            $output=str_replace('<###begin###>',$html,$output);
        else
            $output=$html.$output;
    }
}

public function renderBodyEnd(&$output)
{
    if(!isset($this->scriptFiles[self::POS_END]) && !isset($this->scripts[self::POS_END])
        && !isset($this->scripts[self::POS_READY]) && !isset($this->scripts[self::POS_LOAD]))
        return;

    $fullPage=0;
    $output=preg_replace('/(<\\/body\s*>)/is','<###end###>$1',$output,1,$fullPage);
    $html='';
    if(isset($this->scriptFiles[self::POS_END]))
    {
        foreach($this->scriptFiles[self::POS_END] as $scriptFile)
            $html.=CHtml::scriptFile($scriptFile)."\n";
    }
    $scripts=isset($this->scripts[self::POS_END]) ? $this->scripts[self::POS_END] : array();
    if(isset($this->scripts[self::POS_READY]))
    {
        if($fullPage)
            $scripts[]="jQuery(function($) {\n".implode("\n",$this->scripts[self::POS_READY])."\n});";
        else
            $scripts[]=implode("\n",$this->scripts[self::POS_READY]);
    }
    if(isset($this->scripts[self::POS_LOAD]))
    {
        if($fullPage)
            $scripts[]="jQuery(window).load(function() {\n".implode("\n",$this->scripts[self::POS_LOAD])."\n});";
        else
            $scripts[]=implode("\n",$this->scripts[self::POS_LOAD]);
    }
    if(!empty($scripts))
        $html.=CHtml::script(implode("\n",$scripts))."\n";

    if($fullPage)
        $output=str_replace('<###end###>',$html,$output);
    else
        $output=$output.$html;
}

public function renderCoreScripts()
{
    if($this->coreScripts===null)
        return;
    $cssFiles=array();
    $jsFiles=array();
    foreach($this->coreScripts as $name=>$package)
    {
        $baseUrl=$this->getPackageBaseUrl($name);
        if(!empty($package['js']))
        {
            foreach($package['js'] as $js)
                $jsFiles[$baseUrl.'/'.$js]=$baseUrl.'/'.$js;
        }
        if(!empty($package['css']))
        {
            foreach($package['css'] as $css)
                $cssFiles[$baseUrl.'/'.$css]='';
        }
    }
    // merge in place
    if($cssFiles!==array())
    {
        foreach($this->cssFiles as $cssFile=>$media)
            $cssFiles[$cssFile]=$media;
        $this->cssFiles=$cssFiles;
    }
    if($jsFiles!==array())
    {
        if(isset($this->scriptFiles[$this->coreScriptPosition]))
        {
            foreach($this->scriptFiles[$this->coreScriptPosition] as $url)
                $jsFiles[$url]=$url;
        }
        $this->scriptFiles[$this->coreScriptPosition]=$jsFiles;
    }
}

public function renderHead(&$output)
{
    $html='';
    foreach($this->metaTags as $meta)
        $html.=CHtml::metaTag($meta['content'],null,null,$meta)."\n";
    foreach($this->linkTags as $link)
        $html.=CHtml::linkTag(null,null,null,null,$link)."\n";
    foreach($this->cssFiles as $url=>$media)
        $html.=CHtml::cssFile($url,$media)."\n";
    foreach($this->css as $css)
        $html.=CHtml::css($css[0],$css[1])."\n";
    if($this->enableJavaScript)
    {
        if(isset($this->scriptFiles[self::POS_HEAD]))
        {
            foreach($this->scriptFiles[self::POS_HEAD] as $scriptFile)
                $html.=CHtml::scriptFile($scriptFile)."\n";
        }

        if(isset($this->scripts[self::POS_HEAD]))
            $html.=CHtml::script(implode("\n",$this->scripts[self::POS_HEAD]))."\n";
    }

    if($html!=='')
    {
        $count=0;
        $output=preg_replace('/(<title\b[^>]*>|<\\/head\s*>)/is','<###head###>$1',$output,1,$count);
        if($count)
            $output=str_replace('<###head###>',$html,$output);
        else
            $output=$html.$output;
    }
}

public function reset()
{
    $this->hasScripts=false;
    $this->coreScripts=array();
    $this->cssFiles=array();
    $this->css=array();
    $this->scriptFiles=array();
    $this->scripts=array();
    $this->metaTags=array();
    $this->linkTags=array();

    $this->recordCachingAction('clientScript','reset',array());
}

public function setCoreScriptUrl($value)
{
    $this->_baseUrl=$value;
}

protected function unifyScripts()
{
    if(!$this->enableJavaScript)
        return;
    $map=array();
    if(isset($this->scriptFiles[self::POS_HEAD]))
        $map=$this->scriptFiles[self::POS_HEAD];

    if(isset($this->scriptFiles[self::POS_BEGIN]))
    {
        foreach($this->scriptFiles[self::POS_BEGIN] as $key=>$scriptFile)
        {
            if(isset($map[$scriptFile]))
                unset($this->scriptFiles[self::POS_BEGIN][$key]);
            else
                $map[$scriptFile]=true;
        }
    }

    if(isset($this->scriptFiles[self::POS_END]))
    {
        foreach($this->scriptFiles[self::POS_END] as $key=>$scriptFile)
        {
            if(isset($map[$scriptFile]))
                unset($this->scriptFiles[self::POS_END][$key]);
        }
    }
}