--- /dev/null
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2017 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\Util;
+
+use Psy\Exception\RuntimeException;
+use Psy\Reflection\ReflectionConstant;
+
+/**
+ * A utility class for getting Reflectors.
+ */
+class Mirror
+{
+ const CONSTANT = 1;
+ const METHOD = 2;
+ const STATIC_PROPERTY = 4;
+ const PROPERTY = 8;
+
+ /**
+ * Get a Reflector for a function, class or instance, constant, method or property.
+ *
+ * Optionally, pass a $filter param to restrict the types of members checked. For example, to only Reflectors for
+ * static properties and constants, pass:
+ *
+ * $filter = Mirror::CONSTANT | Mirror::STATIC_PROPERTY
+ *
+ * @throws \Psy\Exception\RuntimeException when a $member specified but not present on $value
+ * @throws \InvalidArgumentException if $value is something other than an object or class/function name
+ *
+ * @param mixed $value Class or function name, or variable instance
+ * @param string $member Optional: property, constant or method name (default: null)
+ * @param int $filter (default: CONSTANT | METHOD | PROPERTY | STATIC_PROPERTY)
+ *
+ * @return Reflector
+ */
+ public static function get($value, $member = null, $filter = 15)
+ {
+ if ($member === null && is_string($value) && function_exists($value)) {
+ return new \ReflectionFunction($value);
+ }
+
+ $class = self::getClass($value);
+
+ if ($member === null) {
+ return $class;
+ } elseif ($filter & self::CONSTANT && $class->hasConstant($member)) {
+ return new ReflectionConstant($class, $member);
+ } elseif ($filter & self::METHOD && $class->hasMethod($member)) {
+ return $class->getMethod($member);
+ } elseif ($filter & self::PROPERTY && $class->hasProperty($member)) {
+ return $class->getProperty($member);
+ } elseif ($filter & self::STATIC_PROPERTY && $class->hasProperty($member) && $class->getProperty($member)->isStatic()) {
+ return $class->getProperty($member);
+ } else {
+ throw new RuntimeException(sprintf(
+ 'Unknown member %s on class %s',
+ $member,
+ is_object($value) ? get_class($value) : $value
+ ));
+ }
+ }
+
+ /**
+ * Get a ReflectionClass (or ReflectionObject) if possible.
+ *
+ * @throws \InvalidArgumentException if $value is not a class name or instance
+ *
+ * @param mixed $value
+ *
+ * @return \ReflectionClass
+ */
+ private static function getClass($value)
+ {
+ if (is_object($value)) {
+ return new \ReflectionObject($value);
+ }
+
+ if (!is_string($value)) {
+ throw new \InvalidArgumentException('Mirror expects an object or class');
+ } elseif (!class_exists($value) && !interface_exists($value) && !(function_exists('trait_exists') && trait_exists($value))) {
+ throw new \InvalidArgumentException('Unknown class or function: ' . $value);
+ }
+
+ return new \ReflectionClass($value);
+ }
+}