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<?php
/**
* CCompareValidator 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/
*/

/**
* CCompareValidator compares the specified attribute value with another value and validates if they are equal.
*
* The value being compared with can be another attribute value
* (specified via {@link compareAttribute}) or a constant (specified via
* {@link compareValue}. When both are specified, the latter takes
* precedence. If neither is specified, the attribute will be compared
* with another attribute whose name is by appending "_repeat" to the source
* attribute name.
*
* The comparison can be either {@link strict} or not.
*
* CCompareValidator supports different comparison operators.
* Previously, it only compares to see if two values are equal or not.
*
* When using the {@link message} property to define a custom error message, the message
* may contain additional placeholders that will be replaced with the actual content. In addition
* to the "{attribute}" placeholder, recognized by all validators (see {@link CValidator}),
* CCompareValidator allows for the following placeholders to be specified:
* <ul>
* <li>{compareValue}: replaced with the constant value being compared with {@link compareValue}.</li>
* </ul>
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.validators
* @since 1.0
*/
class CCompareValidator extends CValidator
{
/**
* @var string the name of the attribute to be compared with
*/
public $compareAttribute;
/**
* @var string the constant value to be compared with
*/
public $compareValue;
/**
* @var boolean whether the comparison is strict (both value and type must be the same.)
* Defaults to false.
*/
public $strict=false;
/**
* @var boolean whether the attribute value can be null or empty. Defaults to false.
* If this is true, it means the attribute is considered valid when it is empty.
*/
public $allowEmpty=false;
/**
* @var string the operator for comparison. Defaults to '='.
* The followings are valid operators:
* <ul>
* <li>'=' or '==': validates to see if the two values are equal. If {@link strict} is true, the comparison
* will be done in strict mode (i.e. checking value type as well).</li>
* <li>'!=': validates to see if the two values are NOT equal. If {@link strict} is true, the comparison
* will be done in strict mode (i.e. checking value type as well).</li>
* <li>'>': validates to see if the value being validated is greater than the value being compared with.</li>
* <li>'>=': validates to see if the value being validated is greater than or equal to the value being compared with.</li>
* <li>'<': validates to see if the value being validated is less than the value being compared with.</li>
* <li>'<=': validates to see if the value being validated is less than or equal to the value being compared with.</li>
* </ul>
*/
public $operator='=';

/**
* Validates the attribute of the object.
* If there is any error, the error message is added to the object.
* @param CModel $object the object being validated
* @param string $attribute the attribute being validated
*/
protected function validateAttribute($object,$attribute)
{
$value=$object->$attribute;
if($this->allowEmpty && $this->isEmpty($value))
return;
if($this->compareValue!==null)
$compareTo=$compareValue=$this->compareValue;
else
{
$compareAttribute=$this->compareAttribute===null ? $attribute.'_repeat' : $this->compareAttribute;
$compareValue=$object->$compareAttribute;
$compareTo=$object->getAttributeLabel($compareAttribute);
}

switch($this->operator)
{
case '=':
case '==':
if(($this->strict && $value!==$compareValue) || (!$this->strict && $value!=$compareValue))
{
$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} must be repeated exactly.');
$this->addError($object,$attribute,$message,array('{compareAttribute}'=>$compareTo));
}
break;
case '!=':
if(($this->strict && $value===$compareValue) || (!$this->strict && $value==$compareValue))
{
$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} must not be equal to "{compareValue}".');
$this->addError($object,$attribute,$message,array('{compareAttribute}'=>$compareTo,'{compareValue}'=>$compareValue));
}
break;
case '>':
if($value<=$compareValue)
{
$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} must be greater than "{compareValue}".');
$this->addError($object,$attribute,$message,array('{compareAttribute}'=>$compareTo,'{compareValue}'=>$compareValue));
}
break;
case '>=':
if($value<$compareValue)
{
$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} must be greater than or equal to "{compareValue}".');
$this->addError($object,$attribute,$message,array('{compareAttribute}'=>$compareTo,'{compareValue}'=>$compareValue));
}
break;
case '<':
if($value>=$compareValue)
{
$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} must be less than "{compareValue}".');
$this->addError($object,$attribute,$message,array('{compareAttribute}'=>$compareTo,'{compareValue}'=>$compareValue));
}
break;
case '<=':
if($value>$compareValue)
{
$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} must be less than or equal to "{compareValue}".');
$this->addError($object,$attribute,$message,array('{compareAttribute}'=>$compareTo,'{compareValue}'=>$compareValue));
}
break;
default:
throw new CException(Yii::t('yii','Invalid operator "{operator}".',array('{operator}'=>$this->operator)));
}
}

/**
* Returns the JavaScript needed for performing client-side validation.
* @param CModel $object the data object being validated
* @param string $attribute the name of the attribute to be validated.
* @return string the client-side validation script.
* @see CActiveForm::enableClientValidation
* @since 1.1.7
*/
public function clientValidateAttribute($object,$attribute)
{
if($this->compareValue !== null)
{
$compareTo=$this->compareValue;
$compareValue=CJSON::encode($this->compareValue);
}
else
{
$compareAttribute=$this->compareAttribute === null ? $attribute . '_repeat' : $this->compareAttribute;
$compareValue="\$('#" . (CHtml::activeId($object, $compareAttribute)) . "').val()";
$compareTo=$object->getAttributeLabel($compareAttribute);
}

$message=$this->message;
switch($this->operator)
{
case '=':
case '==':
if($message===null)
$message=Yii::t('yii','{attribute} must be repeated exactly.');
$condition='value!='.$compareValue;
break;
case '!=':
if($message===null)
$message=Yii::t('yii','{attribute} must not be equal to "{compareValue}".');
$condition='value=='.$compareValue;
break;
case '>':
if($message===null)
$message=Yii::t('yii','{attribute} must be greater than "{compareValue}".');
$condition='parseFloat(value)<=parseFloat('.$compareValue.')';
break;
case '>=':
if($message===null)
$message=Yii::t('yii','{attribute} must be greater than or equal to "{compareValue}".');
$condition='parseFloat(value)<parseFloat('.$compareValue.')';
break;
case '<':
if($message===null)
$message=Yii::t('yii','{attribute} must be less than "{compareValue}".');
$condition='parseFloat(value)>=parseFloat('.$compareValue.')';
break;
case '<=':
if($message===null)
$message=Yii::t('yii','{attribute} must be less than or equal to "{compareValue}".');
$condition='parseFloat(value)>parseFloat('.$compareValue.')';
break;
default:
throw new CException(Yii::t('yii','Invalid operator "{operator}".',array('{operator}'=>$this->operator)));
}

$message=strtr($message,array(
'{attribute}'=>$object->getAttributeLabel($attribute),
'{compareValue}'=>$compareTo,
));

return "
if(".($this->allowEmpty ? "$.trim(value)!='' && " : '').$condition.") {
messages.push(".CJSON::encode($message).");
}
";
}
}
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