--- /dev/null
+<?php
+
+/*
+ * This file is part of the Behat.
+ * (c) Konstantin Kudryashov <ever.zet@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Behat\Behat\Definition\Pattern\Policy;
+
+use Behat\Behat\Definition\Pattern\Pattern;
+use Behat\Behat\Definition\Pattern\PatternTransformer;
+
+/**
+ * Defines a way to handle custom definition patterns.
+ *
+ * @see PatternTransformer
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+interface PatternPolicy
+{
+ /**
+ * Checks if policy supports pattern type.
+ *
+ * @param string $type
+ *
+ * @return Boolean
+ */
+ public function supportsPatternType($type);
+
+ /**
+ * Generates pattern for step text.
+ *
+ * @param string $stepText
+ *
+ * @return Pattern
+ */
+ public function generatePattern($stepText);
+
+ /**
+ * Checks if policy supports pattern.
+ *
+ * @param string $pattern
+ *
+ * @return Boolean
+ */
+ public function supportsPattern($pattern);
+
+ /**
+ * Transforms pattern string to regex.
+ *
+ * @param string $pattern
+ *
+ * @return string
+ */
+ public function transformPatternToRegex($pattern);
+}