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Filename : Scalar.php
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<?php
/**
 * PHPUnit
 *
 * Copyright (c) 2002-2011, 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     Bernhard Schussek <bschussek@2bepublished.at>
 * @copyright  2002-2011 Sebastian Bergmann <sebastian@phpunit.de>
 * @license    http://www.opensource.org/licenses/bsd-license.php  BSD License
 * @link       http://www.phpunit.de/
 * @since      File available since Release 3.6.0
 */

/**
 * Compares scalar or NULL values for equality.
 *
 * @package    PHPUnit
 * @subpackage Framework_Comparator
 * @author     Bernhard Schussek <bschussek@2bepublished.at>
 * @copyright  2002-2011 Sebastian Bergmann <sebastian@phpunit.de>
 * @license    http://www.opensource.org/licenses/bsd-license.php  BSD License
 * @version    Release: 3.6.0
 * @link       http://www.phpunit.de/
 * @since      Class available since Release 3.6.0
 */
class PHPUnit_Framework_Comparator_Scalar extends PHPUnit_Framework_Comparator
{
    /**
     * Returns whether the comparator can compare two values.
     *
     * @param  mixed $expected The first value to compare
     * @param  mixed $actual The second value to compare
     * @return boolean
     * @since  Method available since Release 3.6.0
     */
    public function accepts($expected, $actual)
    {
        return ((is_scalar($expected) XOR NULL === $expected) &&
                 (is_scalar($actual) XOR NULL === $actual))
          // allow comparison between strings and objects featuring __toString()
          || (is_string($expected) && is_object($actual) && method_exists($actual, '__toString'))
          || (is_object($expected) && method_exists($expected, '__toString') && is_string($actual));
    }

    /**
     * Asserts that two values are equal.
     *
     * @param  mixed $expected The first value to compare
     * @param  mixed $actual The second value to compare
     * @param  float $delta The allowed numerical distance between two values to
     *                      consider them equal
     * @param  bool  $canonicalize If set to TRUE, arrays are sorted before
     *                             comparison
     * @param  bool  $ignoreCase If set to TRUE, upper- and lowercasing is
     *                           ignored when comparing string values
     * @throws PHPUnit_Framework_ComparisonFailure Thrown when the comparison
     *                           fails. Contains information about the
     *                           specific errors that lead to the failure.
     */
    public function assertEquals($expected, $actual, $delta = 0, $canonicalize = FALSE, $ignoreCase = FALSE)
    {
        $expectedToCompare = $expected;
        $actualToCompare = $actual;

        // always compare as strings to avoid strange behaviour
        // otherwise 0 == 'Foobar'
        if (is_string($expected) || is_string($actual)) {
            $expectedToCompare = (string)$expectedToCompare;
            $actualToCompare = (string)$actualToCompare;

            if ($ignoreCase) {
                $expectedToCompare = strtolower($expectedToCompare);
                $actualToCompare = strtolower($actualToCompare);
            }
        }

        if ($expectedToCompare != $actualToCompare) {
            if (is_string($expected) && is_string($actual)) {
                throw new PHPUnit_Framework_ComparisonFailure(
                  $expected,
                  $actual,
                  PHPUnit_Util_Type::export($expected),
                  PHPUnit_Util_Type::export($actual),
                  FALSE,
                  'Failed asserting that two strings are equal.'
                );
            }

            throw new PHPUnit_Framework_ComparisonFailure(
              $expected,
              $actual,
              // no diff is required
              '',
              '',
              FALSE,
              sprintf(
                'Failed asserting that %s matches expected %s.',

                PHPUnit_Util_Type::export($actual),
                PHPUnit_Util_Type::export($expected)
              )
            );
        }
    }
}