Xor.php

<?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_Constraint
 * @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
 */

/**
 * Logical XOR.
 *
 * @package    PHPUnit
 * @subpackage Framework_Constraint
 * @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      Class available since Release 3.0.0
 */
class PHPUnit_Framework_Constraint_Xor extends PHPUnit_Framework_Constraint {

  /**
   * @var PHPUnit_Framework_Constraint[]
   */
  protected $constraints = array();

  /**
   * @param PHPUnit_Framework_Constraint[] $constraints
   */
  public function setConstraints(array $constraints) {
    $this->constraints = array();
    foreach ($constraints as $key => $constraint) {
      if (!$constraint instanceof PHPUnit_Framework_Constraint) {
        $constraint = new PHPUnit_Framework_Constraint_IsEqual($constraint);
      }
      $this->constraints[] = $constraint;
    }
  }

  /**
   * 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 = TRUE;
    $lastResult = NULL;
    $constraint = NULL;
    foreach ($this->constraints as $constraint) {
      $result = $constraint
        ->evaluate($other, $description, TRUE);
      if ($result === $lastResult) {
        $success = FALSE;
        break;
      }
      $lastResult = $result;
    }
    if ($returnResult) {
      return $success;
    }
    if (!$success) {
      $this
        ->fail($other, $description);
    }
  }

  /**
   * Returns a string representation of the constraint.
   *
   * @return string
   */
  public function toString() {
    $text = '';
    foreach ($this->constraints as $key => $constraint) {
      if ($key > 0) {
        $text .= ' xor ';
      }
      $text .= $constraint
        ->toString();
    }
    return $text;
  }

  /**
   * Counts the number of constraint elements.
   *
   * @return integer
   * @since  Method available since Release 3.4.0
   */
  public function count() {
    $count = 0;
    foreach ($this->constraints as $constraint) {
      $count += count($constraint);
    }
    return $count;
  }

}