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<?php
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/*
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* This file is part of Psy Shell.
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*
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* (c) 2012-2022 Justin Hileman
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Psy\Util;
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use Psy\Exception\RuntimeException;
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use Psy\Reflection\ReflectionClassConstant;
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use Psy\Reflection\ReflectionConstant_;
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use Psy\Reflection\ReflectionNamespace;
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/**
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* A utility class for getting Reflectors.
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*/
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class Mirror
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{
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const CONSTANT = 1;
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const METHOD = 2;
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const STATIC_PROPERTY = 4;
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const PROPERTY = 8;
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/**
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* Get a Reflector for a function, class or instance, constant, method or property.
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*
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* Optionally, pass a $filter param to restrict the types of members checked. For example, to only Reflectors for
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* static properties and constants, pass:
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*
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* $filter = Mirror::CONSTANT | Mirror::STATIC_PROPERTY
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*
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* @throws \Psy\Exception\RuntimeException when a $member specified but not present on $value
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* @throws \InvalidArgumentException if $value is something other than an object or class/function name
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*
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* @param mixed $value Class or function name, or variable instance
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* @param string $member Optional: property, constant or method name (default: null)
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* @param int $filter (default: CONSTANT | METHOD | PROPERTY | STATIC_PROPERTY)
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*
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* @return \Reflector
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*/
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public static function get($value, string $member = null, int $filter = 15): \Reflector
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{
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if ($member === null && \is_string($value)) {
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if (\function_exists($value)) {
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return new \ReflectionFunction($value);
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} elseif (\defined($value) || ReflectionConstant_::isMagicConstant($value)) {
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return new ReflectionConstant_($value);
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}
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}
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$class = self::getClass($value);
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if ($member === null) {
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return $class;
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} elseif ($filter & self::CONSTANT && $class->hasConstant($member)) {
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return ReflectionClassConstant::create($value, $member);
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} elseif ($filter & self::METHOD && $class->hasMethod($member)) {
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return $class->getMethod($member);
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} elseif ($filter & self::PROPERTY && $class->hasProperty($member)) {
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return $class->getProperty($member);
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} elseif ($filter & self::STATIC_PROPERTY && $class->hasProperty($member) && $class->getProperty($member)->isStatic()) {
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return $class->getProperty($member);
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} else {
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throw new RuntimeException(\sprintf('Unknown member %s on class %s', $member, \is_object($value) ? \get_class($value) : $value));
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}
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}
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/**
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* Get a ReflectionClass (or ReflectionObject, or ReflectionNamespace) if possible.
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*
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* @throws \InvalidArgumentException if $value is not a namespace or class name or instance
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*
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* @param mixed $value
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*
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* @return \ReflectionClass|ReflectionNamespace
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*/
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private static function getClass($value)
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{
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if (\is_object($value)) {
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return new \ReflectionObject($value);
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}
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if (!\is_string($value)) {
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throw new \InvalidArgumentException('Mirror expects an object or class');
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}
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if (\class_exists($value) || \interface_exists($value) || \trait_exists($value)) {
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return new \ReflectionClass($value);
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}
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$namespace = \preg_replace('/(^\\\\|\\\\$)/', '', $value);
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if (self::namespaceExists($namespace)) {
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return new ReflectionNamespace($namespace);
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}
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throw new \InvalidArgumentException('Unknown namespace, class or function: '.$value);
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}
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/**
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* Check declared namespaces for a given namespace.
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*/
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private static function namespaceExists(string $value): bool
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{
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return \in_array(\strtolower($value), self::getDeclaredNamespaces());
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}
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/**
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* Get an array of all currently declared namespaces.
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*
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* Note that this relies on at least one function, class, interface, trait
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* or constant to have been declared in that namespace.
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*/
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private static function getDeclaredNamespaces(): array
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{
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$functions = \get_defined_functions();
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$allNames = \array_merge(
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$functions['internal'],
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$functions['user'],
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\get_declared_classes(),
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\get_declared_interfaces(),
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\get_declared_traits(),
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\array_keys(\get_defined_constants())
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);
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$namespaces = [];
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foreach ($allNames as $name) {
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$chunks = \explode('\\', \strtolower($name));
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// the last one is the function or class or whatever...
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\array_pop($chunks);
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while (!empty($chunks)) {
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$namespaces[\implode('\\', $chunks)] = true;
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\array_pop($chunks);
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}
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}
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$namespaceNames = \array_keys($namespaces);
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\sort($namespaceNames);
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return $namespaceNames;
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}
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}
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