--- /dev/null
+<?php
+/*
+ * 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.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\Common\Collections\Expr;
+
+/**
+ * Walks an expression graph and turns it into a PHP closure.
+ *
+ * This closure can be used with {@Collection#filter()} and is used internally
+ * by {@ArrayCollection#select()}.
+ *
+ * @author Benjamin Eberlei <kontakt@beberlei.de>
+ * @since 2.3
+ */
+class ClosureExpressionVisitor extends ExpressionVisitor
+{
+ /**
+ * Accesses the field of a given object. This field has to be public
+ * directly or indirectly (through an accessor get*, is*, or a magic
+ * method, __get, __call).
+ *
+ * @param object $object
+ * @param string $field
+ *
+ * @return mixed
+ */
+ public static function getObjectFieldValue($object, $field)
+ {
+ if (is_array($object)) {
+ return $object[$field];
+ }
+
+ $accessors = array('get', 'is');
+
+ foreach ($accessors as $accessor) {
+ $accessor .= $field;
+
+ if ( ! method_exists($object, $accessor)) {
+ continue;
+ }
+
+ return $object->$accessor();
+ }
+
+ // __call should be triggered for get.
+ $accessor = $accessors[0] . $field;
+
+ if (method_exists($object, '__call')) {
+ return $object->$accessor();
+ }
+
+ if ($object instanceof \ArrayAccess) {
+ return $object[$field];
+ }
+
+ return $object->$field;
+ }
+
+ /**
+ * Helper for sorting arrays of objects based on multiple fields + orientations.
+ *
+ * @param string $name
+ * @param int $orientation
+ * @param \Closure $next
+ *
+ * @return \Closure
+ */
+ public static function sortByField($name, $orientation = 1, \Closure $next = null)
+ {
+ if ( ! $next) {
+ $next = function() {
+ return 0;
+ };
+ }
+
+ return function ($a, $b) use ($name, $next, $orientation) {
+ $aValue = ClosureExpressionVisitor::getObjectFieldValue($a, $name);
+ $bValue = ClosureExpressionVisitor::getObjectFieldValue($b, $name);
+
+ if ($aValue === $bValue) {
+ return $next($a, $b);
+ }
+
+ return (($aValue > $bValue) ? 1 : -1) * $orientation;
+ };
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public function walkComparison(Comparison $comparison)
+ {
+ $field = $comparison->getField();
+ $value = $comparison->getValue()->getValue(); // shortcut for walkValue()
+
+ switch ($comparison->getOperator()) {
+ case Comparison::EQ:
+ return function ($object) use ($field, $value) {
+ return ClosureExpressionVisitor::getObjectFieldValue($object, $field) === $value;
+ };
+
+ case Comparison::NEQ:
+ return function ($object) use ($field, $value) {
+ return ClosureExpressionVisitor::getObjectFieldValue($object, $field) !== $value;
+ };
+
+ case Comparison::LT:
+ return function ($object) use ($field, $value) {
+ return ClosureExpressionVisitor::getObjectFieldValue($object, $field) < $value;
+ };
+
+ case Comparison::LTE:
+ return function ($object) use ($field, $value) {
+ return ClosureExpressionVisitor::getObjectFieldValue($object, $field) <= $value;
+ };
+
+ case Comparison::GT:
+ return function ($object) use ($field, $value) {
+ return ClosureExpressionVisitor::getObjectFieldValue($object, $field) > $value;
+ };
+
+ case Comparison::GTE:
+ return function ($object) use ($field, $value) {
+ return ClosureExpressionVisitor::getObjectFieldValue($object, $field) >= $value;
+ };
+
+ case Comparison::IN:
+ return function ($object) use ($field, $value) {
+ return in_array(ClosureExpressionVisitor::getObjectFieldValue($object, $field), $value);
+ };
+
+ case Comparison::NIN:
+ return function ($object) use ($field, $value) {
+ return ! in_array(ClosureExpressionVisitor::getObjectFieldValue($object, $field), $value);
+ };
+
+ case Comparison::CONTAINS:
+ return function ($object) use ($field, $value) {
+ return false !== strpos(ClosureExpressionVisitor::getObjectFieldValue($object, $field), $value);
+ };
+
+ default:
+ throw new \RuntimeException("Unknown comparison operator: " . $comparison->getOperator());
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public function walkValue(Value $value)
+ {
+ return $value->getValue();
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public function walkCompositeExpression(CompositeExpression $expr)
+ {
+ $expressionList = array();
+
+ foreach ($expr->getExpressionList() as $child) {
+ $expressionList[] = $this->dispatch($child);
+ }
+
+ switch($expr->getType()) {
+ case CompositeExpression::TYPE_AND:
+ return $this->andExpressions($expressionList);
+
+ case CompositeExpression::TYPE_OR:
+ return $this->orExpressions($expressionList);
+
+ default:
+ throw new \RuntimeException("Unknown composite " . $expr->getType());
+ }
+ }
+
+ /**
+ * @param array $expressions
+ *
+ * @return callable
+ */
+ private function andExpressions($expressions)
+ {
+ return function ($object) use ($expressions) {
+ foreach ($expressions as $expression) {
+ if ( ! $expression($object)) {
+ return false;
+ }
+ }
+ return true;
+ };
+ }
+
+ /**
+ * @param array $expressions
+ *
+ * @return callable
+ */
+ private function orExpressions($expressions)
+ {
+ return function ($object) use ($expressions) {
+ foreach ($expressions as $expression) {
+ if ($expression($object)) {
+ return true;
+ }
+ }
+ return false;
+ };
+ }
+}
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