--- /dev/null
+<?php
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Logical XOR.
+ *
+ * @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 $constraint) {
+ if (!($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 int
+ *
+ * @since Method available since Release 3.4.0
+ */
+ public function count()
+ {
+ $count = 0;
+
+ foreach ($this->constraints as $constraint) {
+ $count += count($constraint);
+ }
+
+ return $count;
+ }
+}