Developer
<?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<int, string|self> */
private array $types;
private bool $simple;
private string $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.
*/
public static function fromReflection(
\ReflectionFunctionAbstract|\ReflectionParameter|\ReflectionProperty $reflection,
): ?self
{
$type = $reflection instanceof \ReflectionFunctionAbstract
? $reflection->getReturnType() ?? (PHP_VERSION_ID >= 80100 && $reflection instanceof \ReflectionMethod ? $reflection->getTentativeReturnType() : null)
: $reflection->getType();
return $type ? self::fromReflectionType($type, $reflection, asObject: true) : null;
}
private static function fromReflectionType(\ReflectionType $type, $of, bool $asObject): self|string
{
if ($type instanceof \ReflectionNamedType) {
$name = self::resolve($type->getName(), $of);
return $asObject
? new self($type->allowsNull() && $name !== 'mixed' ? [$name, 'null'] : [$name])
: $name;
} elseif ($type instanceof \ReflectionUnionType || $type instanceof \ReflectionIntersectionType) {
return new self(
array_map(fn($t) => self::fromReflectionType($t, $of, asObject: false), $type->getTypes()),
$type instanceof \ReflectionUnionType ? '|' : '&',
);
} else {
throw new Nette\InvalidStateException('Unexpected type of ' . Reflection::toString($of));
}
}
/**
* Creates the Type object according to the text notation.
*/
public static function fromString(string $type): self
{
if (!Validators::isTypeDeclaration($type)) {
throw new Nette\InvalidArgumentException("Invalid type '$type'.");
}
if ($type[0] === '?') {
return new self([substr($type, 1), 'null']);
}
$unions = [];
foreach (explode('|', $type) as $part) {
$part = explode('&', trim($part, '()'));
$unions[] = count($part) === 1 ? $part[0] : new self($part, '&');
}
return count($unions) === 1 && $unions[0] instanceof self
? $unions[0]
: new self($unions);
}
/**
* Resolves 'self', 'static' and 'parent' to the actual class name.
*/
public static function resolve(
string $type,
\ReflectionFunctionAbstract|\ReflectionParameter|\ReflectionProperty $of,
): string
{
$lower = strtolower($type);
if ($of instanceof \ReflectionFunction) {
return $type;
} elseif ($lower === 'self') {
return $of->getDeclaringClass()->name;
} elseif ($lower === 'static') {
return ($of instanceof ReflectionMethod ? $of->getOriginalClass() : $of->getDeclaringClass())->name;
} elseif ($lower === 'parent' && $of->getDeclaringClass()->getParentClass()) {
return $of->getDeclaringClass()->getParentClass()->name;
} else {
return $type;
}
}
private function __construct(array $types, string $kind = '|')
{
$o = array_search('null', $types, strict: true);
if ($o !== false) { // null as last
array_splice($types, $o, 1);
$types[] = 'null';
}
$this->types = $types;
$this->simple = is_string($types[0]) && ($types[1] ?? 'null') === 'null';
$this->kind = count($types) > 1 ? $kind : '';
}
public function __toString(): string
{
$multi = count($this->types) > 1;
if ($this->simple) {
return ($multi ? '?' : '') . $this->types[0];
}
$res = [];
foreach ($this->types as $type) {
$res[] = $type instanceof self && $multi ? "($type)" : $type;
}
return implode($this->kind, $res);
}
/**
* Returns the array of subtypes that make up the compound type as strings.
* @return array<int, string|string[]>
*/
public function getNames(): array
{
return array_map(fn($t) => $t instanceof self ? $t->getNames() : $t, $this->types);
}
/**
* Returns the array of subtypes that make up the compound type as Type objects:
* @return self[]
*/
public function getTypes(): array
{
return array_map(fn($t) => $t instanceof self ? $t : new self([$t]), $this->types);
}
/**
* Returns the type name for simple types, otherwise null.
*/
public function getSingleName(): ?string
{
return $this->simple
? $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 simple type. Single nullable types are also considered to be simple types.
*/
public function isSimple(): bool
{
return $this->simple;
}
/** @deprecated use isSimple() */
public function isSingle(): bool
{
return $this->simple;
}
/**
* Returns true whether the type is both a simple and a PHP built-in type.
*/
public function isBuiltin(): bool
{
return $this->simple && Validators::isBuiltinType($this->types[0]);
}
/**
* Returns true whether the type is both a simple and a class name.
*/
public function isClass(): bool
{
return $this->simple && !Validators::isBuiltinType($this->types[0]);
}
/**
* Determines if type is special class name self/parent/static.
*/
public function isClassKeyword(): bool
{
return $this->simple && Validators::isClassKeyword($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 $subtype): bool
{
if ($this->types === ['mixed']) {
return true;
}
$subtype = self::fromString($subtype);
return $subtype->isUnion()
? Arrays::every($subtype->types, fn($t) => $this->allows2($t instanceof self ? $t->types : [$t]))
: $this->allows2($subtype->types);
}
private function allows2(array $subtypes): bool
{
return $this->isUnion()
? Arrays::some($this->types, fn($t) => $this->allows3($t instanceof self ? $t->types : [$t], $subtypes))
: $this->allows3($this->types, $subtypes);
}
private function allows3(array $types, array $subtypes): bool
{
return Arrays::every(
$types,
fn($type) => Arrays::some(
$subtypes,
fn($subtype) => Validators::isBuiltinType($type)
? strcasecmp($type, $subtype) === 0
: is_a($subtype, $type, allow_string: true)
)
);
}
}
Developer
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