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TemplateTypeTrait.php
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TemplateTypeTrait.php
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<?php declare(strict_types = 1);
namespace PHPStan\Type\Generic;
use PHPStan\TrinaryLogic;
use PHPStan\Type\GeneralizePrecision;
use PHPStan\Type\IntersectionType;
use PHPStan\Type\MixedType;
use PHPStan\Type\Type;
use PHPStan\Type\TypeCombinator;
use PHPStan\Type\UnionType;
use PHPStan\Type\VerbosityLevel;
use function sprintf;
/**
* @template TBound of Type
*/
trait TemplateTypeTrait
{
private string $name;
private TemplateTypeScope $scope;
private TemplateTypeStrategy $strategy;
private TemplateTypeVariance $variance;
/** @var TBound */
private Type $bound;
public function getName(): string
{
return $this->name;
}
public function getScope(): TemplateTypeScope
{
return $this->scope;
}
/** @return TBound */
public function getBound(): Type
{
return $this->bound;
}
public function describe(VerbosityLevel $level): string
{
$basicDescription = function () use ($level): string {
if ($this->bound instanceof MixedType) { // @phpstan-ignore-line
$boundDescription = '';
} else { // @phpstan-ignore-line
$boundDescription = sprintf(' of %s', $this->bound->describe($level));
}
return sprintf(
'%s%s',
$this->name,
$boundDescription,
);
};
return $level->handle(
$basicDescription,
$basicDescription,
fn (): string => sprintf('%s (%s, %s)', $basicDescription(), $this->scope->describe(), $this->isArgument() ? 'argument' : 'parameter'),
);
}
public function isArgument(): bool
{
return $this->strategy->isArgument();
}
public function toArgument(): TemplateType
{
return new self(
$this->scope,
new TemplateTypeArgumentStrategy(),
$this->variance,
$this->name,
TemplateTypeHelper::toArgument($this->getBound()),
);
}
public function isValidVariance(Type $a, Type $b): TrinaryLogic
{
return $this->variance->isValidVariance($a, $b);
}
public function subtract(Type $type): Type
{
return $this;
}
public function getTypeWithoutSubtractedType(): Type
{
return $this;
}
public function changeSubtractedType(?Type $subtractedType): Type
{
return $this;
}
public function equals(Type $type): bool
{
return $type instanceof self
&& $type->scope->equals($this->scope)
&& $type->name === $this->name
&& $this->bound->equals($type->bound);
}
public function isAcceptedBy(Type $acceptingType, bool $strictTypes): TrinaryLogic
{
/** @var Type $bound */
$bound = $this->getBound();
if (
!$acceptingType instanceof $bound
&& !$this instanceof $acceptingType
&& !$acceptingType instanceof TemplateType
&& ($acceptingType instanceof UnionType || $acceptingType instanceof IntersectionType)
) {
return $acceptingType->accepts($this, $strictTypes);
}
if (!$acceptingType instanceof TemplateType) {
return $acceptingType->accepts($this->getBound(), $strictTypes);
}
if ($this->getScope()->equals($acceptingType->getScope()) && $this->getName() === $acceptingType->getName()) {
return $acceptingType->getBound()->accepts($this->getBound(), $strictTypes);
}
return $acceptingType->getBound()->accepts($this->getBound(), $strictTypes)
->and(TrinaryLogic::createMaybe());
}
public function accepts(Type $type, bool $strictTypes): TrinaryLogic
{
return $this->strategy->accepts($this, $type, $strictTypes);
}
public function isSuperTypeOf(Type $type): TrinaryLogic
{
if ($type instanceof TemplateType || $type instanceof IntersectionType) {
return $type->isSubTypeOf($this);
}
return $this->getBound()->isSuperTypeOf($type)
->and(TrinaryLogic::createMaybe());
}
public function isSubTypeOf(Type $type): TrinaryLogic
{
/** @var Type $bound */
$bound = $this->getBound();
if (
!$type instanceof $bound
&& !$this instanceof $type
&& !$type instanceof TemplateType
&& ($type instanceof UnionType || $type instanceof IntersectionType)
) {
return $type->isSuperTypeOf($this);
}
if (!$type instanceof TemplateType) {
return $type->isSuperTypeOf($this->getBound());
}
if ($this->getScope()->equals($type->getScope()) && $this->getName() === $type->getName()) {
return $type->getBound()->isSuperTypeOf($this->getBound());
}
return $type->getBound()->isSuperTypeOf($this->getBound())
->and(TrinaryLogic::createMaybe());
}
public function inferTemplateTypes(Type $receivedType): TemplateTypeMap
{
if (!$receivedType instanceof TemplateType && ($receivedType instanceof UnionType || $receivedType instanceof IntersectionType)) {
return $receivedType->inferTemplateTypesOn($this);
}
if (
$receivedType instanceof TemplateType
&& $this->getBound()->isSuperTypeOf($receivedType->getBound())->yes()
) {
return new TemplateTypeMap([
$this->name => $receivedType,
]);
}
$map = $this->getBound()->inferTemplateTypes($receivedType);
$resolvedBound = TemplateTypeHelper::resolveTemplateTypes($this->getBound(), $map);
if ($resolvedBound->isSuperTypeOf($receivedType)->yes()) {
return (new TemplateTypeMap([
$this->name => $this->shouldGeneralizeInferredType() ? $receivedType->generalize(GeneralizePrecision::templateArgument()) : $receivedType,
]))->union($map);
}
return $map;
}
public function getReferencedTemplateTypes(TemplateTypeVariance $positionVariance): array
{
return [new TemplateTypeReference($this, $positionVariance)];
}
public function getVariance(): TemplateTypeVariance
{
return $this->variance;
}
protected function shouldGeneralizeInferredType(): bool
{
return true;
}
public function tryRemove(Type $typeToRemove): ?Type
{
$removedBound = TypeCombinator::remove($this->getBound(), $typeToRemove);
$type = TemplateTypeFactory::create(
$this->getScope(),
$this->getName(),
$removedBound,
$this->getVariance(),
);
if ($this->isArgument()) {
return TemplateTypeHelper::toArgument($type);
}
return $type;
}
/**
* @param mixed[] $properties
*/
public static function __set_state(array $properties): Type
{
return new self(
$properties['scope'],
$properties['strategy'],
$properties['variance'],
$properties['name'],
$properties['bound'],
);
}
}