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CGettextMessageSource

Package system.i18n
Inheritance class CGettextMessageSource » CMessageSource » CApplicationComponent » CComponent
Implements IApplicationComponent
Since 1.0
Source Code framework/i18n/CGettextMessageSource.php
CGettextMessageSource represents a message source that is based on GNU Gettext.

Each CGettextMessageSource instance represents the message translations for a single domain. And each message category represents a message context in Gettext. Translated messages are stored as either a MO or PO file, depending on the useMoFile property value.

All translations are saved under the basePath directory. Translations in one language are kept as MO or PO files under an individual subdirectory whose name is the language ID. The file name is specified via catalog property, which defaults to 'messages'.

Public Properties

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PropertyTypeDescriptionDefined By
basePath string the base path for all translated messages. CGettextMessageSource
behaviors array the behaviors that should be attached to this component. CApplicationComponent
cacheID string the ID of the cache application component that is used to cache the messages. CGettextMessageSource
cachingDuration integer the time in seconds that the messages can remain valid in cache. CGettextMessageSource
catalog string the message catalog name. CGettextMessageSource
forceTranslation boolean whether to force message translation when the source and target languages are the same. CMessageSource
isInitialized boolean Checks if this application component has been initialized. CApplicationComponent
language string the language that the source messages are written in. CMessageSource
useBigEndian boolean whether to use Big Endian to read MO files. CGettextMessageSource
useMoFile boolean whether to load messages from MO files. CGettextMessageSource

Public Methods

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MethodDescriptionDefined By
__call() Calls the named method which is not a class method. CComponent
__get() Returns a property value, an event handler list or a behavior based on its name. CComponent
__isset() Checks if a property value is null. CComponent
__set() Sets value of a component property. CComponent
__unset() Sets a component property to be null. CComponent
asa() Returns the named behavior object. CComponent
attachBehavior() Attaches a behavior to this component. CComponent
attachBehaviors() Attaches a list of behaviors to the component. CComponent
attachEventHandler() Attaches an event handler to an event. CComponent
canGetProperty() Determines whether a property can be read. CComponent
canSetProperty() Determines whether a property can be set. CComponent
detachBehavior() Detaches a behavior from the component. CComponent
detachBehaviors() Detaches all behaviors from the component. CComponent
detachEventHandler() Detaches an existing event handler. CComponent
disableBehavior() Disables an attached behavior. CComponent
disableBehaviors() Disables all behaviors attached to this component. CComponent
enableBehavior() Enables an attached behavior. CComponent
enableBehaviors() Enables all behaviors attached to this component. CComponent
evaluateExpression() Evaluates a PHP expression or callback under the context of this component. CComponent
getEventHandlers() Returns the list of attached event handlers for an event. CComponent
getIsInitialized() Checks if this application component has been initialized. CApplicationComponent
getLanguage() Returns the language that the source messages are written in. Defaults to application language. CMessageSource
hasEvent() Determines whether an event is defined. CComponent
hasEventHandler() Checks whether the named event has attached handlers. CComponent
hasProperty() Determines whether a property is defined. CComponent
init() Initializes the application component. CGettextMessageSource
onMissingTranslation() Raised when a message cannot be translated. CMessageSource
raiseEvent() Raises an event. CComponent
setLanguage() Sets the language that the source messages are written in. CMessageSource
translate() Translates a message to the specified language. CMessageSource

Protected Methods

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MethodDescriptionDefined By
loadMessages() Loads the message translation for the specified language and category. CGettextMessageSource
translateMessage() Translates the specified message. CMessageSource

Events

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EventDescriptionDefined By
onMissingTranslation Raised when a message cannot be translated. CMessageSource

Property Details

basePath property
public string $basePath;

the base path for all translated messages. Defaults to null, meaning the "messages" subdirectory of the application directory (e.g. "protected/messages").

cacheID property
public string $cacheID;

the ID of the cache application component that is used to cache the messages. Defaults to 'cache' which refers to the primary cache application component. Set this property to false if you want to disable caching the messages.

cachingDuration property
public integer $cachingDuration;

the time in seconds that the messages can remain valid in cache. Defaults to 0, meaning the caching is disabled.

catalog property
public string $catalog;

the message catalog name. This is the name of the message file (without extension) that stores the translated messages. Defaults to 'messages'.

useBigEndian property
public boolean $useBigEndian;

whether to use Big Endian to read MO files. Defaults to false. This property is only used when useMoFile is true.

useMoFile property
public boolean $useMoFile;

whether to load messages from MO files. Defaults to true. If false, messages will be loaded from PO files.

Method Details

init() method
public void init()
Source Code: framework/i18n/CGettextMessageSource.php#71 (show)
public function init()
{
    parent::init();
    if($this->basePath===null)
        $this->basePath=Yii::getPathOfAlias('application.messages');
}

Initializes the application component. This method overrides the parent implementation by preprocessing the user request data.

loadMessages() method
protected array loadMessages(string $category, string $language)
$category string the message category
$language string the target language
{return} array the loaded messages
Source Code: framework/i18n/CGettextMessageSource.php#84 (show)
protected function loadMessages($category, $language)
{
    $messageFile=$this->basePath . DIRECTORY_SEPARATOR . $language . DIRECTORY_SEPARATOR . $this->catalog;
    if($this->useMoFile)
        $messageFile.=self::MO_FILE_EXT;
    else
        $messageFile.=self::PO_FILE_EXT;

    if ($this->cachingDuration > 0 && $this->cacheID!==false && ($cache=Yii::app()->getComponent($this->cacheID))!==null)
    {
        $key = self::CACHE_KEY_PREFIX . $messageFile . "." . $category;
        if (($data=$cache->get($key)) !== false)
            return unserialize($data);
    }

    if (is_file($messageFile))
    {
        if($this->useMoFile)
            $file=new CGettextMoFile($this->useBigEndian);
        else
            $file=new CGettextPoFile();
        $messages=$file->load($messageFile,$category);
        if(isset($cache))
        {
            $dependency=new CFileCacheDependency($messageFile);
            $cache->set($key,serialize($messages),$this->cachingDuration,$dependency);
        }
        return $messages;
    }
    else
        return array();
}

Loads the message translation for the specified language and category.