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Mirror.php
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Mirror.php
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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2023 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;
use Psy\Reflection\ReflectionNamespace;
/**
* 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, ?string $member = null, int $filter = 15): \Reflector
{
if ($member === null && \is_string($value)) {
if (\function_exists($value)) {
return new \ReflectionFunction($value);
} elseif (\defined($value) || ReflectionConstant::isMagicConstant($value)) {
return new ReflectionConstant($value);
}
}
$class = self::getClass($value);
if ($member === null) {
return $class;
} elseif ($filter & self::CONSTANT && $class->hasConstant($member)) {
return new \ReflectionClassConstant($value, $member);
} elseif ($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, or ReflectionNamespace) if possible.
*
* @throws \InvalidArgumentException if $value is not a namespace or class name or instance
*
* @param mixed $value
*
* @return \ReflectionClass|ReflectionNamespace
*/
private static function getClass($value)
{
if (\is_object($value)) {
return new \ReflectionObject($value);
}
if (!\is_string($value)) {
throw new \InvalidArgumentException('Mirror expects an object or class');
}
if (\class_exists($value) || \interface_exists($value) || \trait_exists($value)) {
return new \ReflectionClass($value);
}
$namespace = \preg_replace('/(^\\\\|\\\\$)/', '', $value);
if (self::namespaceExists($namespace)) {
return new ReflectionNamespace($namespace);
}
throw new \InvalidArgumentException('Unknown namespace, class or function: '.$value);
}
/**
* Check declared namespaces for a given namespace.
*/
private static function namespaceExists(string $value): bool
{
return \in_array(\strtolower($value), self::getDeclaredNamespaces());
}
/**
* Get an array of all currently declared namespaces.
*
* Note that this relies on at least one function, class, interface, trait
* or constant to have been declared in that namespace.
*/
private static function getDeclaredNamespaces(): array
{
$functions = \get_defined_functions();
$allNames = \array_merge(
$functions['internal'],
$functions['user'],
\get_declared_classes(),
\get_declared_interfaces(),
\get_declared_traits(),
\array_keys(\get_defined_constants())
);
$namespaces = [];
foreach ($allNames as $name) {
$chunks = \explode('\\', \strtolower($name));
// the last one is the function or class or whatever...
\array_pop($chunks);
while (!empty($chunks)) {
$namespaces[\implode('\\', $chunks)] = true;
\array_pop($chunks);
}
}
$namespaceNames = \array_keys($namespaces);
\sort($namespaceNames);
return $namespaceNames;
}
}

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