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<?php
/**
* This file is part of the Nette Framework (https://nette.org)
* Copyright (c) 2004 David Grudl (https://davidgrudl.com)
*/
declare(strict_types=1);
namespace Nette\Utils;
use Nette;
/**
* PHP type reflection.
*/
final class Type
{
/** @var array */
private $types;
/** @var bool */
private $single;
/** @var string |, & */
private $kind;
/**
* Creates a Type object based on reflection. Resolves self, static and parent to the actual class name.
* If the subject has no type, it returns null.
* @param \ReflectionFunctionAbstract|\ReflectionParameter|\ReflectionProperty $reflection
*/
public static function fromReflection($reflection): ?self
{
if ($reflection instanceof \ReflectionProperty && PHP_VERSION_ID < 70400) {
return null;
} elseif ($reflection instanceof \ReflectionMethod) {
$type = $reflection->getReturnType() ?? (PHP_VERSION_ID >= 80100 ? $reflection->getTentativeReturnType() : null);
} else {
$type = $reflection instanceof \ReflectionFunctionAbstract
? $reflection->getReturnType()
: $reflection->getType();
}
if ($type === null) {
return null;
} elseif ($type instanceof \ReflectionNamedType) {
$name = self::resolve($type->getName(), $reflection);
return new self($type->allowsNull() && $type->getName() !== 'mixed' ? [$name, 'null'] : [$name]);
} elseif ($type instanceof \ReflectionUnionType || $type instanceof \ReflectionIntersectionType) {
return new self(
array_map(
function ($t) use ($reflection) { return self::resolve($t->getName(), $reflection); },
$type->getTypes()
),
$type instanceof \ReflectionUnionType ? '|' : '&'
);
} else {
throw new Nette\InvalidStateException('Unexpected type of ' . Reflection::toString($reflection));
}
}
/**
* Creates the Type object according to the text notation.
*/
public static function fromString(string $type): self
{
if (!preg_match('#(?:
\?([\w\\\\]+)|
[\w\\\\]+ (?: (&[\w\\\\]+)* | (\|[\w\\\\]+)* )
)()$#xAD', $type, $m)) {
throw new Nette\InvalidArgumentException("Invalid type '$type'.");
}
[, $nType, $iType] = $m;
if ($nType) {
return new self([$nType, 'null']);
} elseif ($iType) {
return new self(explode('&', $type), '&');
} else {
return new self(explode('|', $type));
}
}
/**
* Resolves 'self', 'static' and 'parent' to the actual class name.
* @param \ReflectionFunctionAbstract|\ReflectionParameter|\ReflectionProperty $reflection
*/
public static function resolve(string $type, $reflection): string
{
$lower = strtolower($type);
if ($reflection instanceof \ReflectionFunction) {
return $type;
} elseif ($lower === 'self' || $lower === 'static') {
return $reflection->getDeclaringClass()->name;
} elseif ($lower === 'parent' && $reflection->getDeclaringClass()->getParentClass()) {
return $reflection->getDeclaringClass()->getParentClass()->name;
} else {
return $type;
}
}
private function __construct(array $types, string $kind = '|')
{
if ($types[0] === 'null') { // null as last
array_push($types, array_shift($types));
}
$this->types = $types;
$this->single = ($types[1] ?? 'null') === 'null';
$this->kind = count($types) > 1 ? $kind : '';
}
public function __toString(): string
{
return $this->single
? (count($this->types) > 1 ? '?' : '') . $this->types[0]
: implode($this->kind, $this->types);
}
/**
* Returns the array of subtypes that make up the compound type as strings.
* @return string[]
*/
public function getNames(): array
{
return $this->types;
}
/**
* Returns the array of subtypes that make up the compound type as Type objects:
* @return self[]
*/
public function getTypes(): array
{
return array_map(function ($name) { return self::fromString($name); }, $this->types);
}
/**
* Returns the type name for single types, otherwise null.
*/
public function getSingleName(): ?string
{
return $this->single
? $this->types[0]
: null;
}
/**
* Returns true whether it is a union type.
*/
public function isUnion(): bool
{
return $this->kind === '|';
}
/**
* Returns true whether it is an intersection type.
*/
public function isIntersection(): bool
{
return $this->kind === '&';
}
/**
* Returns true whether it is a single type. Simple nullable types are also considered to be single types.
*/
public function isSingle(): bool
{
return $this->single;
}
/**
* Returns true whether the type is both a single and a PHP built-in type.
*/
public function isBuiltin(): bool
{
return $this->single && Reflection::isBuiltinType($this->types[0]);
}
/**
* Returns true whether the type is both a single and a class name.
*/
public function isClass(): bool
{
return $this->single && !Reflection::isBuiltinType($this->types[0]);
}
/**
* Determines if type is special class name self/parent/static.
*/
public function isClassKeyword(): bool
{
return $this->single && Reflection::isClassKeyword($this->types[0]);
}
/**
* Verifies type compatibility. For example, it checks if a value of a certain type could be passed as a parameter.
*/
public function allows(string $type): bool
{
if ($this->types === ['mixed']) {
return true;
}
$type = self::fromString($type);
if ($this->isIntersection()) {
if (!$type->isIntersection()) {
return false;
}
return Arrays::every($this->types, function ($currentType) use ($type) {
$builtin = Reflection::isBuiltinType($currentType);
return Arrays::some($type->types, function ($testedType) use ($currentType, $builtin) {
return $builtin
? strcasecmp($currentType, $testedType) === 0
: is_a($testedType, $currentType, true);
});
});
}
$method = $type->isIntersection() ? 'some' : 'every';
return Arrays::$method($type->types, function ($testedType) {
$builtin = Reflection::isBuiltinType($testedType);
return Arrays::some($this->types, function ($currentType) use ($testedType, $builtin) {
return $builtin
? strcasecmp($currentType, $testedType) === 0
: is_a($testedType, $currentType, true);
});
});
}
}