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<?php |
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|
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/** |
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* This file is part of the Nette Framework (https://nette.org) |
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* Copyright (c) 2004 David Grudl (https://davidgrudl.com) |
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*/ |
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declare (strict_types=1); |
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namespace Packetery\Nette\Utils; |
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|
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use Packetery\Nette; |
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/** |
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* PHP reflection helpers. |
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*/ |
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final class Reflection |
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{ |
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use \Packetery\Nette\StaticClass; |
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private const BuiltinTypes = ['string' => 1, 'int' => 1, 'float' => 1, 'bool' => 1, 'array' => 1, 'object' => 1, 'callable' => 1, 'iterable' => 1, 'void' => 1, 'null' => 1, 'mixed' => 1, 'false' => 1, 'never' => 1]; |
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private const ClassKeywords = ['self' => 1, 'parent' => 1, 'static' => 1]; |
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/** |
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* Determines if type is PHP built-in type. Otherwise, it is the class name. |
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*/ |
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public static function isBuiltinType(string $type) : bool |
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{ |
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return isset(self::BuiltinTypes[\strtolower($type)]); |
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} |
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/** |
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* Determines if type is special class name self/parent/static. |
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*/ |
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public static function isClassKeyword(string $name) : bool |
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{ |
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return isset(self::ClassKeywords[\strtolower($name)]); |
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} |
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/** |
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* Returns the type of return value of given function or method and normalizes `self`, `static`, and `parent` to actual class names. |
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* If the function does not have a return type, it returns null. |
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* If the function has union or intersection type, it throws \Packetery\Nette\InvalidStateException. |
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*/ |
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public static function getReturnType(\ReflectionFunctionAbstract $func) : ?string |
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{ |
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$type = $func->getReturnType() ?? (\PHP_VERSION_ID >= 80100 && $func instanceof \ReflectionMethod ? $func->getTentativeReturnType() : null); |
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return self::getType($func, $type); |
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} |
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/** |
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* @deprecated |
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*/ |
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public static function getReturnTypes(\ReflectionFunctionAbstract $func) : array |
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{ |
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$type = Type::fromReflection($func); |
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return $type ? $type->getNames() : []; |
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} |
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/** |
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* Returns the type of given parameter and normalizes `self` and `parent` to the actual class names. |
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* If the parameter does not have a type, it returns null. |
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* If the parameter has union or intersection type, it throws \Packetery\Nette\InvalidStateException. |
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*/ |
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public static function getParameterType(\ReflectionParameter $param) : ?string |
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{ |
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return self::getType($param, $param->getType()); |
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} |
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/** |
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* @deprecated |
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*/ |
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public static function getParameterTypes(\ReflectionParameter $param) : array |
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{ |
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$type = Type::fromReflection($param); |
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return $type ? $type->getNames() : []; |
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} |
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/** |
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* Returns the type of given property and normalizes `self` and `parent` to the actual class names. |
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* If the property does not have a type, it returns null. |
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* If the property has union or intersection type, it throws \Packetery\Nette\InvalidStateException. |
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*/ |
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public static function getPropertyType(\ReflectionProperty $prop) : ?string |
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{ |
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return self::getType($prop, \PHP_VERSION_ID >= 70400 ? $prop->getType() : null); |
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} |
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/** |
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* @deprecated |
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*/ |
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public static function getPropertyTypes(\ReflectionProperty $prop) : array |
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{ |
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$type = Type::fromReflection($prop); |
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return $type ? $type->getNames() : []; |
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} |
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/** |
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* @param \ReflectionFunction|\ReflectionMethod|\ReflectionParameter|\ReflectionProperty $reflection |
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*/ |
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private static function getType($reflection, ?\ReflectionType $type) : ?string |
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{ |
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if ($type === null) { |
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return null; |
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} elseif ($type instanceof \ReflectionNamedType) { |
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return Type::resolve($type->getName(), $reflection); |
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} elseif ($type instanceof \ReflectionUnionType || $type instanceof \ReflectionIntersectionType) { |
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throw new \Packetery\Nette\InvalidStateException('The ' . self::toString($reflection) . ' is not expected to have a union or intersection type.'); |
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} else { |
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throw new \Packetery\Nette\InvalidStateException('Unexpected type of ' . self::toString($reflection)); |
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} |
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} |
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/** |
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* Returns the default value of parameter. If it is a constant, it returns its value. |
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* @return mixed |
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* @throws \ReflectionException If the parameter does not have a default value or the constant cannot be resolved |
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*/ |
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public static function getParameterDefaultValue(\ReflectionParameter $param) |
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{ |
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if ($param->isDefaultValueConstant()) { |
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$const = $orig = $param->getDefaultValueConstantName(); |
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$pair = \explode('::', $const); |
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if (isset($pair[1])) { |
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$pair[0] = Type::resolve($pair[0], $param); |
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try { |
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$rcc = new \ReflectionClassConstant($pair[0], $pair[1]); |
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} catch (\ReflectionException $e) { |
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$name = self::toString($param); |
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throw new \ReflectionException("Unable to resolve constant {$orig} used as default value of {$name}.", 0, $e); |
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} |
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return $rcc->getValue(); |
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} elseif (!\defined($const)) { |
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$const = \substr((string) \strrchr($const, '\\'), 1); |
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if (!\defined($const)) { |
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$name = self::toString($param); |
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throw new \ReflectionException("Unable to resolve constant {$orig} used as default value of {$name}."); |
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} |
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} |
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return \constant($const); |
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} |
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return $param->getDefaultValue(); |
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} |
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/** |
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* Returns a reflection of a class or trait that contains a declaration of given property. Property can also be declared in the trait. |
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*/ |
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public static function getPropertyDeclaringClass(\ReflectionProperty $prop) : \ReflectionClass |
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{ |
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foreach ($prop->getDeclaringClass()->getTraits() as $trait) { |
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if ($trait->hasProperty($prop->name) && $trait->getProperty($prop->name)->getDocComment() === $prop->getDocComment()) { |
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return self::getPropertyDeclaringClass($trait->getProperty($prop->name)); |
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} |
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} |
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return $prop->getDeclaringClass(); |
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} |
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/** |
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* Returns a reflection of a method that contains a declaration of $method. |
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* Usually, each method is its own declaration, but the body of the method can also be in the trait and under a different name. |
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*/ |
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public static function getMethodDeclaringMethod(\ReflectionMethod $method) : \ReflectionMethod |
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{ |
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// file & line guessing as workaround for insufficient PHP reflection |
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$decl = $method->getDeclaringClass(); |
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if ($decl->getFileName() === $method->getFileName() && $decl->getStartLine() <= $method->getStartLine() && $decl->getEndLine() >= $method->getEndLine()) { |
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return $method; |
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} |
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$hash = [$method->getFileName(), $method->getStartLine(), $method->getEndLine()]; |
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if (($alias = $decl->getTraitAliases()[$method->name] ?? null) && ($m = new \ReflectionMethod($alias)) && $hash === [$m->getFileName(), $m->getStartLine(), $m->getEndLine()]) { |
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return self::getMethodDeclaringMethod($m); |
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} |
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foreach ($decl->getTraits() as $trait) { |
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if ($trait->hasMethod($method->name) && ($m = $trait->getMethod($method->name)) && $hash === [$m->getFileName(), $m->getStartLine(), $m->getEndLine()]) { |
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return self::getMethodDeclaringMethod($m); |
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} |
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} |
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return $method; |
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} |
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/** |
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* Finds out if reflection has access to PHPdoc comments. Comments may not be available due to the opcode cache. |
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*/ |
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public static function areCommentsAvailable() : bool |
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{ |
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static $res; |
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return $res ?? ($res = (bool) (new \ReflectionMethod(__METHOD__))->getDocComment()); |
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} |
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public static function toString(\Reflector $ref) : string |
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{ |
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if ($ref instanceof \ReflectionClass) { |
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return $ref->name; |
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} elseif ($ref instanceof \ReflectionMethod) { |
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return $ref->getDeclaringClass()->name . '::' . $ref->name . '()'; |
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} elseif ($ref instanceof \ReflectionFunction) { |
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return $ref->name . '()'; |
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} elseif ($ref instanceof \ReflectionProperty) { |
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return self::getPropertyDeclaringClass($ref)->name . '::$' . $ref->name; |
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} elseif ($ref instanceof \ReflectionParameter) { |
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return '$' . $ref->name . ' in ' . self::toString($ref->getDeclaringFunction()); |
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} else { |
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throw new \Packetery\Nette\InvalidArgumentException(); |
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} |
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} |
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/** |
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* Expands the name of the class to full name in the given context of given class. |
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* Thus, it returns how the PHP parser would understand $name if it were written in the body of the class $context. |
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* @throws \Packetery\Nette\InvalidArgumentException |
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*/ |
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public static function expandClassName(string $name, \ReflectionClass $context) : string |
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{ |
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$lower = \strtolower($name); |
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if (empty($name)) { |
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throw new \Packetery\Nette\InvalidArgumentException('Class name must not be empty.'); |
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} elseif (isset(self::BuiltinTypes[$lower])) { |
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return $lower; |
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} elseif ($lower === 'self' || $lower === 'static') { |
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return $context->name; |
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} elseif ($lower === 'parent') { |
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return $context->getParentClass() ? $context->getParentClass()->name : 'parent'; |
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} elseif ($name[0] === '\\') { |
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// fully qualified name |
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return \ltrim($name, '\\'); |
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} |
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$uses = self::getUseStatements($context); |
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$parts = \explode('\\', $name, 2); |
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if (isset($uses[$parts[0]])) { |
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$parts[0] = $uses[$parts[0]]; |
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return \implode('\\', $parts); |
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} elseif ($context->inNamespace()) { |
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return $context->getNamespaceName() . '\\' . $name; |
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} else { |
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return $name; |
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} |
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} |
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/** @return array of [alias => class] */ |
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public static function getUseStatements(\ReflectionClass $class) : array |
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{ |
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if ($class->isAnonymous()) { |
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throw new \Packetery\Nette\NotImplementedException('Anonymous classes are not supported.'); |
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} |
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static $cache = []; |
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if (!isset($cache[$name = $class->name])) { |
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if ($class->isInternal()) { |
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$cache[$name] = []; |
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} else { |
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$code = \file_get_contents($class->getFileName()); |
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$cache = self::parseUseStatements($code, $name) + $cache; |
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} |
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} |
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return $cache[$name]; |
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} |
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/** |
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* Parses PHP code to [class => [alias => class, ...]] |
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*/ |
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private static function parseUseStatements(string $code, ?string $forClass = null) : array |
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{ |
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try { |
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$tokens = \token_get_all($code, \TOKEN_PARSE); |
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} catch (\ParseError $e) { |
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\trigger_error($e->getMessage(), \E_USER_NOTICE); |
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$tokens = []; |
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} |
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$namespace = $class = $classLevel = $level = null; |
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$res = $uses = []; |
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$nameTokens = \PHP_VERSION_ID < 80000 ? [\T_STRING, \T_NS_SEPARATOR] : [\T_STRING, \T_NS_SEPARATOR, \T_NAME_QUALIFIED, \T_NAME_FULLY_QUALIFIED]; |
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while ($token = \current($tokens)) { |
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\next($tokens); |
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switch (\is_array($token) ? $token[0] : $token) { |
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case \T_NAMESPACE: |
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$namespace = \ltrim(self::fetch($tokens, $nameTokens) . '\\', '\\'); |
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$uses = []; |
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break; |
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case \T_CLASS: |
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case \T_INTERFACE: |
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case \T_TRAIT: |
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case \PHP_VERSION_ID < 80100 ? \T_CLASS : \T_ENUM: |
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if ($name = self::fetch($tokens, \T_STRING)) { |
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$class = $namespace . $name; |
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$classLevel = $level + 1; |
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$res[$class] = $uses; |
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if ($class === $forClass) { |
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return $res; |
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} |
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} |
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break; |
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case \T_USE: |
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while (!$class && ($name = self::fetch($tokens, $nameTokens))) { |
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$name = \ltrim($name, '\\'); |
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if (self::fetch($tokens, '{')) { |
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while ($suffix = self::fetch($tokens, $nameTokens)) { |
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if (self::fetch($tokens, \T_AS)) { |
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$uses[self::fetch($tokens, \T_STRING)] = $name . $suffix; |
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} else { |
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$tmp = \explode('\\', $suffix); |
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$uses[\end($tmp)] = $name . $suffix; |
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} |
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if (!self::fetch($tokens, ',')) { |
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break; |
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} |
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} |
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} elseif (self::fetch($tokens, \T_AS)) { |
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$uses[self::fetch($tokens, \T_STRING)] = $name; |
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} else { |
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$tmp = \explode('\\', $name); |
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$uses[\end($tmp)] = $name; |
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} |
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if (!self::fetch($tokens, ',')) { |
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break; |
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} |
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} |
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break; |
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case \T_CURLY_OPEN: |
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case \T_DOLLAR_OPEN_CURLY_BRACES: |
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case '{': |
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$level++; |
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break; |
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case '}': |
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if ($level === $classLevel) { |
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$class = $classLevel = null; |
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} |
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$level--; |
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} |
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} |
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return $res; |
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} |
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private static function fetch(array &$tokens, $take) : ?string |
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{ |
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$res = null; |
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while ($token = \current($tokens)) { |
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[$token, $s] = \is_array($token) ? $token : [$token, $token]; |
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if (\in_array($token, (array) $take, \true)) { |
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$res .= $s; |
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} elseif (!\in_array($token, [\T_DOC_COMMENT, \T_WHITESPACE, \T_COMMENT], \true)) { |
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break; |
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} |
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\next($tokens); |
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} |
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return $res; |
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} |
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} |
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|
