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<?php
/**
* PHPUnit
*
* Copyright (c) 2001-2013, Sebastian Bergmann <sebastian@phpunit.de>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Sebastian Bergmann nor the names of his
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @package PHPUnit
* @subpackage Framework
* @author Sebastian Bergmann <sebastian@phpunit.de>
* @author Bernhard Schussek <bschussek@2bepublished.at>
* @copyright 2001-2013 Sebastian Bergmann <sebastian@phpunit.de>
* @license http://www.opensource.org/licenses/BSD-3-Clause The BSD 3-Clause License
* @link http://www.phpunit.de/
* @since File available since Release 3.0.0
*/
/**
* Abstract base class for constraints. which are placed upon any value.
*
* @package PHPUnit
* @subpackage Framework
* @author Sebastian Bergmann <sebastian@phpunit.de>
* @author Bernhard Schussek <bschussek@2bepublished.at>
* @copyright 2001-2013 Sebastian Bergmann <sebastian@phpunit.de>
* @license http://www.opensource.org/licenses/BSD-3-Clause The BSD 3-Clause License
* @link http://www.phpunit.de/
* @since Interface available since Release 3.0.0
*/
abstract class PHPUnit_Framework_Constraint implements Countable, PHPUnit_Framework_SelfDescribing
{
/**
* Evaluates the constraint for parameter $other
*
* If $returnResult is set to FALSE (the default), an exception is thrown
* in case of a failure. NULL is returned otherwise.
*
* If $returnResult is TRUE, the result of the evaluation is returned as
* a boolean value instead: TRUE in case of success, FALSE in case of a
* failure.
*
* @param mixed $other Value or object to evaluate.
* @param string $description Additional information about the test
* @param bool $returnResult Whether to return a result or throw an exception
* @return mixed
* @throws PHPUnit_Framework_ExpectationFailedException
*/
public function evaluate($other, $description = '', $returnResult = FALSE)
{
$success = FALSE;
if ($this->matches($other)) {
$success = TRUE;
}
if ($returnResult) {
return $success;
}
if (!$success) {
$this->fail($other, $description);
}
}
/**
* Evaluates the constraint for parameter $other. Returns TRUE if the
* constraint is met, FALSE otherwise.
*
* This method can be overridden to implement the evaluation algorithm.
*
* @param mixed $other Value or object to evaluate.
* @return bool
*/
protected function matches($other)
{
return FALSE;
}
/**
* Counts the number of constraint elements.
*
* @return integer
* @since Method available since Release 3.4.0
*/
public function count()
{
return 1;
}
/**
* Throws an exception for the given compared value and test description
*
* @param mixed $other Evaluated value or object.
* @param string $description Additional information about the test
* @param PHPUnit_Framework_ComparisonFailure $comparisonFailure
* @throws PHPUnit_Framework_ExpectationFailedException
*/
protected function fail($other, $description, PHPUnit_Framework_ComparisonFailure $comparisonFailure = NULL)
{
$failureDescription = sprintf(
'Failed asserting that %s.',
$this->failureDescription($other)
);
$additionalFailureDescription = $this->additionalFailureDescription($other);
if ($additionalFailureDescription) {
$failureDescription .= "\n" . $additionalFailureDescription;
}
if (!empty($description)) {
$failureDescription = $description . "\n" . $failureDescription;
}
throw new PHPUnit_Framework_ExpectationFailedException(
$failureDescription,
$comparisonFailure
);
}
/**
* Return additional failure description where needed
*
* The function can be overridden to provide additional failure
* information like a diff
*
* @param mixed $other Evaluated value or object.
* @return string
*/
protected function additionalFailureDescription($other)
{
return "";
}
/**
* Returns the description of the failure
*
* The beginning of failure messages is "Failed asserting that" in most
* cases. This method should return the second part of that sentence.
*
* To provide additional failure information additionalFailureDescription
* can be used.
*
* @param mixed $other Evaluated value or object.
* @return string
*/
protected function failureDescription($other)
{
return PHPUnit_Util_Type::export($other) . ' ' . $this->toString();
}
}
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