root/branches/gettext/patForms/Rule.php

<?php
/**
 * patForms rule base class
 *
 * $Id$
 *
 * @access        protected
 * @package        patForms
 * @subpackage    Rules
 */

/**
 * patForms rule base class
 *
 * @access        protected
 * @package        patForms
 * @subpackage    Rules
 * @author        Stephan Schmidt <schst@php-tools.net>
 * @author      gERD Schaufelberger <gerd@php-tools.net>
 * @license        LGPL, see license.txt for details
 * @link        http://www.php-tools.net
 * @todo        implement javascript helper methods (set a javascript property plus an
 *                array of keys that will be replaced by the properties of the rule)
 */
class patForms_Rule
{
   /**
    * time when the rule should be applied
    *
    * Possible values are:
    * -PATFORMS_RULE_BEFORE_VALIDATION
    * -PATFORMS_RULE_AFTER_VALIDATION
    * -PATFORMS_RULE_BOTH
    *
    * @access    private
    * @var        integer
    */
    var $_time    =    PATFORMS_RULE_AFTER_VALIDATION;

   /**
    * script that will be displayed only once
    *
    * @access    private
    * @var        array
    */
    var $globalScript    =    array();

   /**
    * script that will be displayed once per instance
    *
    * @access    private
    * @var        array
    */
    var $instanceScript    =    array();

   /**
    * properties that have to be replaced in the instance script.
    *
    * @access    private
    * @var        array
    */
    var $scriptPlaceholders    =    array();

   /**
    * store the container of the rule
    *
    * @access    private
    * @var        object
    */
    var $container;

   /**
    * define error codes an messages for each form element
    *
    * @abstract
    * @access    private
    * @var        array
    */
    var    $validatorErrorCodes  =   array();

   /**
    * error code offset for the rule
    *
    * @abstract
    * @access    private
    */
    var    $errorOffset;

   /**
    * format of the rule
    *
    * @abstract
    * @access    private
    */
    var    $format    =    'html';

   /**
    * name of the rule
    *
    * @abstract
    * @access    private
    */
    var    $ruleName = '';

   /**
    * Get the time when the rule should be applied.
    *
    * This has to be defined in the _time property of the rule.
    *
    * @access    public
    * @return    integer
    */
    function getTime()
    {
        return $this->_time;
    }

   /**
    * create a new rule object
    *
    * @access   public
    * @param    string  id
    */
    function __construct( $id = null )
    {
        $this->loadValidatiorErrorCodes();

        if ($id === null) {
            $id =   uniqid('');
        }
        $this->_id = $id;
    }

   /**
    * create a new rule object
    *
    * @access    public
    * @param    string    id
    */
    function patForms_Rule( $id = null )
    {
        $this->__construct( $id );
    }

   /**
    * set the id for the rule
    *
    * @access    public
    * @param    string    id
    */
    function setId($id)
    {
        $this->_id = $id;
    }

   /**
    * get the unique id of the rule
    *
    * @access public
    * @return string
    */
    function getId()
    {
        return $this->_id;
    }
    
   /**
    * Initialize validation codes using gettext
    *
    * Overwrite this function to add element's error codes
    * 
    * @access   protected
    * @return   bool    $success    Always returns true.
    * @see      $attributeDefaults
    */
    function loadValidatiorErrorCodes()
    {
        $this->validatorErrorCodes  = array();
        return true;
    }

   /**
    * prepare the rule
    *
    * This method is used to initialize the rule.
    * By default it adds it validatorErrorCodes
    * to the container and stores a reference to the
    * container.
    *
    * You may extend it in your custom rules, but should always be calling
    * this method using:
    *
    * <code>
    * patForms_Rule::prepareRule( $container );
    * </code>
    *
    * @access    public
    * @param    object    Either a patForms or patForms_Element object
    */
    function prepareRule( &$container )
    {
        $this->format        =    $container->getFormat();

        $this->container    =    &$container;
        $this->errorOffset    =    $container->getErrorOffset();

        $container->addValidatorErrorCodes( $this->validatorErrorCodes, $this->errorOffset );

        return true;
    }

   /**
    * method called by patForms or any patForms_Element to validate the
    * element or the form.
    *
    * @abstract
    * @access    public
    * @param    object        Either a patForms or patForms_Element object
    * @return    boolean     true, if rule has been applied succesfully, false otherwise
    */
    function applyRule( &$container, $type = PATFORMS_RULE_BEFORE_VALIDATION )
    {
        // your code
    }

   /**
    * addValidationError
    *
    * @access    private
    * @param    integer    $code
    * @param    array    $vars    fill named placeholder with values
    * @return   boolean $result    true on success
    */
    function addValidationError( $code, $vars = array() )
    {
        $code= $this->errorOffset + $code;
        return $this->container->addValidationError( $code, $vars );
    }

   /**
    * get the name of the rule
    *
    * By default just return the classname, this is sufficient.
    *
    * @access    public
    * @return    string
    */
    function getRuleName()
    {
        if (!empty($this->ruleName)) {
            return $this->ruleName;
        }
        return get_class( $this );
    }

   /**
    * Registers the scripts form this rule to the form
    *
    * @access    public
    * @param    string $type   type of the element or rule
    * @param    string $script path to a scriptfile
    * @see        patForms::getScripts()
    * @see        patForms_Element::registerJavascripts()
    * @see        patForms_Rule::registerJavascripts()
    */

    function registerJavascripts(&$form)
    {
        if($script = $this->getGlobalJavascript()) {
            $form->registerGlobalJavascript($this->getRuleName(), $script);
        }

        if($script = $this->getInstanceJavascript()) {
            $form->registerInstanceJavascript($script);
        }
    }

   /**
    * get the global javascript of the rule
    *
    * @access    public
    * @return    string
    * @todo        Rules need to know the output format
    */
    function getGlobalJavascript()
    {
        if(isset($this->globalScript[$this->format])) {
            return $this->globalScript[$this->format];
        }
    }

   /**
    * get the instance javascript of the rule
    *
    * @access    public
    * @return    string
    */
    function getInstanceJavascript()
    {
        if(isset($this->instanceScript[$this->format])) {
            $script    = $this->instanceScript[$this->format];
            $script = str_replace('[RULE::ID]', $this->_id, $script);
            if(method_exists($this->container, 'getId')) {
                $script = str_replace('[CONTAINER::ID]', $this->container->getId(), $script);
            }
            if(method_exists($this->container, 'getName')) {
                $script = str_replace('[CONTAINER::NAME]', $this->container->getName(), $script);
            }
            foreach($this->scriptPlaceholders as $placeholder => $property) {
                if(isset($this->$property)) {
                    $script = str_replace('['.$placeholder.']', $this->$property, $script);
                } else {
                    $script = str_replace('['.$placeholder.']', '', $script);
                }
            }
            return $script;
        }
    }
}
?>