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<?php
/**
* CClientScript 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/
*/

/**
* CClientScript manages JavaScript and CSS stylesheets for views.
*
* @property string $coreScriptUrl The base URL of all core javascript files.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.web
* @since 1.0
*/
class CClientScript extends CApplicationComponent
{
/**
* The script is rendered in the head section right before the title element.
*/
const POS_HEAD=0;
/**
* The script is rendered at the beginning of the body section.
*/
const POS_BEGIN=1;
/**
* The script is rendered at the end of the body section.
*/
const POS_END=2;
/**
* The script is rendered inside window onload function.
*/
const POS_LOAD=3;
/**
* The body script is rendered inside a jQuery ready function.
*/
const POS_READY=4;

/**
* @var boolean whether JavaScript should be enabled. Defaults to true.
*/
public $enableJavaScript=true;
/**
* @var array the mapping between script file names and the corresponding script URLs.
* The array keys are script file names (without directory part) and the array values are the corresponding URLs.
* If an array value is false, the corresponding script file will not be rendered.
* If an array key is '*.js' or '*.css', the corresponding URL will replace all
* JavaScript files or CSS files, respectively.
*
* This property is mainly used to optimize the generated HTML pages
* by merging different scripts files into fewer and optimized script files.
*/
public $scriptMap=array();
/**
* @var array list of custom script packages (name=>package spec).
* This property keeps a list of named script packages, each of which can contain
* a set of CSS and/or JavaScript script files, and their dependent package names.
* By calling {@link registerPackage}, one can register a whole package of client
* scripts together with their dependent packages and render them in the HTML output.
*
* The array structure is as follows:
* <pre>
* array(
* 'package-name'=>array(
* 'basePath'=>'alias of the directory containing the script files',
* 'baseUrl'=>'base URL for the script files',
* 'js'=>array(list of js files relative to basePath/baseUrl),
* 'css'=>array(list of css files relative to basePath/baseUrl),
* 'depends'=>array(list of dependent packages),
* ),
* ......
* )
* </pre>
*
* The JS and CSS files listed are relative to 'basePath'.
* For example, if 'basePath' is 'application.assets', a script named 'comments.js'
* will refer to the file 'protected/assets/comments.js'.
*
* When a script is being rendered in HTML, it will be prefixed with 'baseUrl'.
* For example, if 'baseUrl' is '/assets', the 'comments.js' script will be rendered
* using URL '/assets/comments.js'.
*
* If 'baseUrl' does not start with '/', the relative URL of the application entry
* script will be inserted at the beginning. For example, if 'baseUrl' is 'assets'
* and the current application runs with the URL 'http://localhost/demo/index.php',
* then the 'comments.js' script will be rendered using URL '/demo/assets/comments.js'.
*
* If 'baseUrl' is not set, the script will be published by {@link CAssetManager}
* and the corresponding published URL will be used.
*
* When calling {@link registerPackage} to register a script package,
* this property will be checked first followed by {@link corePackages}.
* If a package is found, it will be registered for rendering later on.
*
* @since 1.1.7
*/
public $packages=array();
/**
* @var array list of core script packages (name=>package spec).
* Please refer to {@link packages} for details about package spec.
*
* By default, the core script packages are specified in 'framework/web/js/packages.php'.
* You may configure this property to customize the core script packages.
*
* When calling {@link registerPackage} to register a script package,
* {@link packages} will be checked first followed by this property.
* If a package is found, it will be registered for rendering later on.
*
* @since 1.1.7
*/
public $corePackages;
/**
* @var array the registered JavaScript code blocks (position, key => code)
*/
public $scripts=array();
/**
* @var array the registered CSS files (CSS URL=>media type).
*/
protected $cssFiles=array();
/**
* @var array the registered JavaScript files (position, key => URL)
*/
protected $scriptFiles=array();
/**
* @var array the registered head meta tags. Each array element represents an option array
* that will be passed as the last parameter of {@link CHtml::metaTag}.
* @since 1.1.3
*/
protected $metaTags=array();
/**
* @var array the registered head link tags. Each array element represents an option array
* that will be passed as the last parameter of {@link CHtml::linkTag}.
* @since 1.1.3
*/
protected $linkTags=array();
/**
* @var array the registered css code blocks (key => array(CSS code, media type)).
* @since 1.1.3
*/
protected $css=array();
/**
* @var boolean whether there are any javascript or css to be rendered.
* @since 1.1.7
*/
protected $hasScripts=false;
/**
* @var array the registered script packages (name => package spec)
* @since 1.1.7
*/
protected $coreScripts=array();
/**
* @var integer Where the scripts registered using {@link registerCoreScript} or {@link registerPackage}
* will be inserted in the page. This can be one of the CClientScript::POS_* constants.
* Defaults to CClientScript::POS_HEAD.
* @since 1.1.3
*/
public $coreScriptPosition=self::POS_HEAD;
/**
* @var integer Where the scripts registered using {@link registerScriptFile} will be inserted in the page.
* This can be one of the CClientScript::POS_* constants.
* Defaults to CClientScript::POS_HEAD.
* @since 1.1.11
*/
public $defaultScriptFilePosition=self::POS_HEAD;
/**
* @var integer Where the scripts registered using {@link registerScript} will be inserted in the page.
* This can be one of the CClientScript::POS_* constants.
* Defaults to CClientScript::POS_READY.
* @since 1.1.11
*/
public $defaultScriptPosition=self::POS_READY;

private $_baseUrl;

/**
* Cleans all registered scripts.
*/
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());
}

/**
* Renders the registered scripts.
* This method is called in {@link CController::render} when it finishes
* rendering content. CClientScript thus gets a chance to insert script tags
* at <code>head</code> and <code>body</code> sections in the HTML output.
* @param string $output the existing output that needs to be inserted with script tags
*/
public function render(&$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);
}
}

/**
* Removes duplicated scripts from {@link scriptFiles}.
* @since 1.1.5
*/
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]);
}
}
}

/**
* Uses {@link scriptMap} to re-map the registered scripts.
*/
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;
}

/**
* Renders the specified core javascript library.
*/
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;
}
}

/**
* Inserts the scripts in the head section.
* @param string $output the output to be inserted with scripts.
*/
public function renderHead(&$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;
}
}

/**
* Inserts the scripts at the beginning of the body section.
* @param string $output the output to be inserted with scripts.
*/
public function renderBodyBegin(&$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;
}
}

/**
* Inserts the scripts at the end of the body section.
* @param string $output the output to be inserted with scripts.
*/
public function renderBodyEnd(&$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;
}

/**
* Returns the base URL of all core javascript files.
* If the base URL is not explicitly set, this method will publish the whole directory
* 'framework/web/js/source' and return the corresponding URL.
* @return string the base URL of all core javascript files
*/
public function getCoreScriptUrl()
{
if($this->_baseUrl!==null)
return $this->_baseUrl;
else
return $this->_baseUrl=Yii::app()->getAssetManager()->publish(YII_PATH.'/web/js/source');
}

/**
* Sets the base URL of all core javascript files.
* This setter is provided in case when core javascript files are manually published
* to a pre-specified location. This may save asset publishing time for large-scale applications.
* @param string $value the base URL of all core javascript files.
*/
public function setCoreScriptUrl($value)
{
$this->_baseUrl=$value;
}

/**
* Returns the base URL for a registered package with the specified name.
* If needed, this method may publish the assets of the package and returns the published base URL.
* @param string $name the package name
* @return string the base URL for the named package. False is returned if the package is not registered yet.
* @see registerPackage
* @since 1.1.8
*/
public function getPackageBaseUrl($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;
}

/**
* Registers a script package that is listed in {@link packages}.
* This method is the same as {@link registerCoreScript}.
* @param string $name the name of the script package.
* @return CClientScript the CClientScript object itself (to support method chaining, available since version 1.1.5).
* @since 1.1.7
* @see renderCoreScript
*/
public function registerPackage($name)
{
return $this->registerCoreScript($name);
}

/**
* Registers a script package that is listed in {@link packages}.
* @param string $name the name of the script package.
* @return CClientScript the CClientScript object itself (to support method chaining, available since version 1.1.5).
* @see renderCoreScript
*/
public function registerCoreScript($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;
}

/**
* Registers a CSS file
* @param string $url URL of the CSS file
* @param string $media media that the CSS file should be applied to. If empty, it means all media types.
* @return CClientScript the CClientScript object itself (to support method chaining, available since version 1.1.5).
*/
public function registerCssFile($url,$media='')
{
$this->hasScripts=true;
$this->cssFiles[$url]=$media;
$params=func_get_args();
$this->recordCachingAction('clientScript','registerCssFile',$params);
return $this;
}

/**
* Registers a piece of CSS code.
* @param string $id ID that uniquely identifies this piece of CSS code
* @param string $css the CSS code
* @param string $media media that the CSS code should be applied to. If empty, it means all media types.
* @return CClientScript the CClientScript object itself (to support method chaining, available since version 1.1.5).
*/
public function registerCss($id,$css,$media='')
{
$this->hasScripts=true;
$this->css[$id]=array($css,$media);
$params=func_get_args();
$this->recordCachingAction('clientScript','registerCss',$params);
return $this;
}

/**
* Registers a javascript file.
* @param string $url URL of the javascript file
* @param integer $position the position of the JavaScript code. Valid values include the following:
* <ul>
* <li>CClientScript::POS_HEAD : the script is inserted in the head section right before the title element.</li>
* <li>CClientScript::POS_BEGIN : the script is inserted at the beginning of the body section.</li>
* <li>CClientScript::POS_END : the script is inserted at the end of the body section.</li>
* </ul>
* @return CClientScript the CClientScript object itself (to support method chaining, available since version 1.1.5).
*/
public function registerScriptFile($url,$position=null)
{
if($position===null)
$position=$this->defaultScriptFilePosition;
$this->hasScripts=true;
$this->scriptFiles[$position][$url]=$url;
$params=func_get_args();
$this->recordCachingAction('clientScript','registerScriptFile',$params);
return $this;
}

/**
* Registers a piece of javascript code.
* @param string $id ID that uniquely identifies this piece of JavaScript code
* @param string $script the javascript code
* @param integer $position the position of the JavaScript code. Valid values include the following:
* <ul>
* <li>CClientScript::POS_HEAD : the script is inserted in the head section right before the title element.</li>
* <li>CClientScript::POS_BEGIN : the script is inserted at the beginning of the body section.</li>
* <li>CClientScript::POS_END : the script is inserted at the end of the body section.</li>
* <li>CClientScript::POS_LOAD : the script is inserted in the window.onload() function.</li>
* <li>CClientScript::POS_READY : the script is inserted in the jQuery's ready function.</li>
* </ul>
* @return CClientScript the CClientScript object itself (to support method chaining, available since version 1.1.5).
*/
public function registerScript($id,$script,$position=null)
{
if($position===null)
$position=$this->defaultScriptPosition;
$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;
}

/**
* Registers a meta tag that will be inserted in the head section (right before the title element) of the resulting page.
*
* <b>Note:</b>
* Meta tags with same attributes will be rendered more then once if called with different values.
*
* <b>Example:</b>
* <pre>
* $cs->registerMetaTag('example', 'description', null, array('lang' => 'en'));
* $cs->registerMetaTag('beispiel', 'description', null, array('lang' => 'de'));
* </pre>
* @param string $content content attribute of the meta tag
* @param string $name name attribute of the meta tag. If null, the attribute will not be generated
* @param string $httpEquiv http-equiv attribute of the meta tag. If null, the attribute will not be generated
* @param array $options other options in name-value pairs (e.g. 'scheme', 'lang')
* @return CClientScript the CClientScript object itself (to support method chaining, available since version 1.1.5).
*/
public function registerMetaTag($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;
}

/**
* Registers a link tag that will be inserted in the head section (right before the title element) of the resulting page.
* @param string $relation rel attribute of the link tag. If null, the attribute will not be generated.
* @param string $type type attribute of the link tag. If null, the attribute will not be generated.
* @param string $href href attribute of the link tag. If null, the attribute will not be generated.
* @param string $media media attribute of the link tag. If null, the attribute will not be generated.
* @param array $options other options in name-value pairs
* @return CClientScript the CClientScript object itself (to support method chaining, available since version 1.1.5).
*/
public function registerLinkTag($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;
}

/**
* Checks whether the CSS file has been registered.
* @param string $url URL of the CSS file
* @return boolean whether the CSS file is already registered
*/
public function isCssFileRegistered($url)
{
return isset($this->cssFiles[$url]);
}

/**
* Checks whether the CSS code has been registered.
* @param string $id ID that uniquely identifies the CSS code
* @return boolean whether the CSS code is already registered
*/
public function isCssRegistered($id)
{
return isset($this->css[$id]);
}

/**
* Checks whether the JavaScript file has been registered.
* @param string $url URL of the javascript file
* @param integer $position the position of the JavaScript code. Valid values include the following:
* <ul>
* <li>CClientScript::POS_HEAD : the script is inserted in the head section right before the title element.</li>
* <li>CClientScript::POS_BEGIN : the script is inserted at the beginning of the body section.</li>
* <li>CClientScript::POS_END : the script is inserted at the end of the body section.</li>
* </ul>
* @return boolean whether the javascript file is already registered
*/
public function isScriptFileRegistered($url,$position=self::POS_HEAD)
{
return isset($this->scriptFiles[$position][$url]);
}

/**
* Checks whether the JavaScript code has been registered.
* @param string $id ID that uniquely identifies the JavaScript code
* @param integer $position the position of the JavaScript code. Valid values include the following:
* <ul>
* <li>CClientScript::POS_HEAD : the script is inserted in the head section right before the title element.</li>
* <li>CClientScript::POS_BEGIN : the script is inserted at the beginning of the body section.</li>
* <li>CClientScript::POS_END : the script is inserted at the end of the body section.</li>
* <li>CClientScript::POS_LOAD : the script is inserted in the window.onload() function.</li>
* <li>CClientScript::POS_READY : the script is inserted in the jQuery's ready function.</li>
* </ul>
* @return boolean whether the javascript code is already registered
*/
public function isScriptRegistered($id,$position=self::POS_READY)
{
return isset($this->scripts[$position][$id]);
}

/**
* Records a method call when an output cache is in effect.
* This is a shortcut to Yii::app()->controller->recordCachingAction.
* In case when controller is absent, nothing is recorded.
* @param string $context a property name of the controller. It refers to an object
* whose method is being called. If empty it means the controller itself.
* @param string $method the method name
* @param array $params parameters passed to the method
* @see COutputCache
*/
protected function recordCachingAction($context,$method,$params)
{
if(($controller=Yii::app()->getController())!==null)
$controller->recordCachingAction($context,$method,$params);
}

/**
* Adds a package to packages list.
*
* @param string $name the name of the script package.
* @param array $definition the definition array of the script package,
* @see CClientScript::packages.
* @return CClientScript the CClientScript object itself (to support method chaining, available since version 1.1.10).
*
* @since 1.1.9
*/
public function addPackage($name,$definition)
{
$this->packages[$name]=$definition;
return $this;
}
}
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