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Edit File: IntersectionType.php

<?php declare(strict_types = 1);

namespace PHPStan\Type;

use PHPStan\Reflection\ClassMemberAccessAnswerer;
use PHPStan\Reflection\ConstantReflection;
use PHPStan\Reflection\MethodReflection;
use PHPStan\Reflection\PropertyReflection;
use PHPStan\Reflection\TrivialParametersAcceptor;
use PHPStan\TrinaryLogic;
use PHPStan\Type\Accessory\AccessoryType;
use PHPStan\Type\Generic\TemplateTypeMap;

class IntersectionType implements CompoundType, StaticResolvableType
{

/** @var \PHPStan\Type\Type[] */
	private $types;

/**
	 * @param Type[] $types
	 */
	public function __construct(array $types)
	{
		$this->types = UnionTypeHelper::sortTypes($types);
	}

/**
	 * @return Type[]
	 */
	public function getTypes(): array
	{
		return $this->types;
	}

/**
	 * @return string[]
	 */
	public function getReferencedClasses(): array
	{
		return UnionTypeHelper::getReferencedClasses($this->types);
	}

public function accepts(Type $otherType, bool $strictTypes): TrinaryLogic
	{
		foreach ($this->types as $type) {
			if (!$type->accepts($otherType, $strictTypes)->yes()) {
				return TrinaryLogic::createNo();
			}
		}

return TrinaryLogic::createYes();
	}

public function isSuperTypeOf(Type $otherType): TrinaryLogic
	{
		$results = [];
		foreach ($this->getTypes() as $innerType) {
			$results[] = $innerType->isSuperTypeOf($otherType);
		}

return TrinaryLogic::createYes()->and(...$results);
	}

public function isSubTypeOf(Type $otherType): TrinaryLogic
	{
		if ($otherType instanceof self || $otherType instanceof UnionType) {
			return $otherType->isSuperTypeOf($this);
		}

$results = [];
		foreach ($this->getTypes() as $innerType) {
			$results[] = $otherType->isSuperTypeOf($innerType);
		}

return TrinaryLogic::maxMin(...$results);
	}

public function isAcceptedBy(Type $acceptingType, bool $strictTypes): TrinaryLogic
	{
		return $this->isSubTypeOf($acceptingType);
	}

public function equals(Type $type): bool
	{
		if (!$type instanceof self) {
			return false;
		}

if (count($this->types) !== count($type->types)) {
			return false;
		}

foreach ($this->types as $i => $innerType) {
			if (!$innerType->equals($type->types[$i])) {
				return false;
			}
		}

return true;
	}

public function describe(VerbosityLevel $level): string
	{
		return $level->handle(
			function () use ($level): string {
				$typeNames = [];
				foreach ($this->types as $type) {
					if ($type instanceof AccessoryType) {
						continue;
					}
					$typeNames[] = TypeUtils::generalizeType($type)->describe($level);
				}

return implode('&', $typeNames);
			},
			function () use ($level): string {
				$typeNames = [];
				foreach ($this->types as $type) {
					if ($type instanceof AccessoryType) {
						continue;
					}
					$typeNames[] = $type->describe($level);
				}

return implode('&', $typeNames);
			},
			function () use ($level): string {
				$typeNames = [];
				foreach ($this->types as $type) {
					$typeNames[] = $type->describe($level);
				}

return implode('&', $typeNames);
			}
		);
	}

public function canAccessProperties(): TrinaryLogic
	{
		return $this->intersectResults(static function (Type $type): TrinaryLogic {
			return $type->canAccessProperties();
		});
	}

public function hasProperty(string $propertyName): TrinaryLogic
	{
		return $this->intersectResults(static function (Type $type) use ($propertyName): TrinaryLogic {
			return $type->hasProperty($propertyName);
		});
	}

public function getProperty(string $propertyName, ClassMemberAccessAnswerer $scope): PropertyReflection
	{
		foreach ($this->types as $type) {
			if ($type->hasProperty($propertyName)->yes()) {
				return $type->getProperty($propertyName, $scope);
			}
		}

throw new \PHPStan\ShouldNotHappenException();
	}

public function canCallMethods(): TrinaryLogic
	{
		return $this->intersectResults(static function (Type $type): TrinaryLogic {
			return $type->canCallMethods();
		});
	}

public function hasMethod(string $methodName): TrinaryLogic
	{
		return $this->intersectResults(static function (Type $type) use ($methodName): TrinaryLogic {
			return $type->hasMethod($methodName);
		});
	}

public function getMethod(string $methodName, ClassMemberAccessAnswerer $scope): MethodReflection
	{
		foreach ($this->types as $type) {
			if ($type->hasMethod($methodName)->yes()) {
				return $type->getMethod($methodName, $scope);
			}
		}

throw new \PHPStan\ShouldNotHappenException();
	}

public function canAccessConstants(): TrinaryLogic
	{
		return $this->intersectResults(static function (Type $type): TrinaryLogic {
			return $type->canAccessConstants();
		});
	}

public function hasConstant(string $constantName): TrinaryLogic
	{
		return $this->intersectResults(static function (Type $type) use ($constantName): TrinaryLogic {
			return $type->hasConstant($constantName);
		});
	}

public function getConstant(string $constantName): ConstantReflection
	{
		foreach ($this->types as $type) {
			if ($type->hasConstant($constantName)->yes()) {
				return $type->getConstant($constantName);
			}
		}

throw new \PHPStan\ShouldNotHappenException();
	}

public function isIterable(): TrinaryLogic
	{
		return $this->intersectResults(static function (Type $type): TrinaryLogic {
			return $type->isIterable();
		});
	}

public function isIterableAtLeastOnce(): TrinaryLogic
	{
		return $this->intersectResults(static function (Type $type): TrinaryLogic {
			return $type->isIterableAtLeastOnce();
		});
	}

public function getIterableKeyType(): Type
	{
		return $this->intersectTypes(static function (Type $type): Type {
			return $type->getIterableKeyType();
		});
	}

public function getIterableValueType(): Type
	{
		return $this->intersectTypes(static function (Type $type): Type {
			return $type->getIterableValueType();
		});
	}

public function isArray(): TrinaryLogic
	{
		return $this->intersectResults(static function (Type $type): TrinaryLogic {
			return $type->isArray();
		});
	}

public function isOffsetAccessible(): TrinaryLogic
	{
		return $this->intersectResults(static function (Type $type): TrinaryLogic {
			return $type->isOffsetAccessible();
		});
	}

public function hasOffsetValueType(Type $offsetType): TrinaryLogic
	{
		return $this->intersectResults(static function (Type $type) use ($offsetType): TrinaryLogic {
			return $type->hasOffsetValueType($offsetType);
		});
	}

public function getOffsetValueType(Type $offsetType): Type
	{
		return $this->intersectTypes(static function (Type $type) use ($offsetType): Type {
			return $type->getOffsetValueType($offsetType);
		});
	}

public function setOffsetValueType(?Type $offsetType, Type $valueType): Type
	{
		return $this->intersectTypes(static function (Type $type) use ($offsetType, $valueType): Type {
			return $type->setOffsetValueType($offsetType, $valueType);
		});
	}

public function isCallable(): TrinaryLogic
	{
		return $this->intersectResults(static function (Type $type): TrinaryLogic {
			return $type->isCallable();
		});
	}

/**
	 * @param \PHPStan\Reflection\ClassMemberAccessAnswerer $scope
	 * @return \PHPStan\Reflection\ParametersAcceptor[]
	 */
	public function getCallableParametersAcceptors(ClassMemberAccessAnswerer $scope): array
	{
		if ($this->isCallable()->no()) {
			throw new \PHPStan\ShouldNotHappenException();
		}

return [new TrivialParametersAcceptor()];
	}

public function isCloneable(): TrinaryLogic
	{
		return $this->intersectResults(static function (Type $type): TrinaryLogic {
			return $type->isCloneable();
		});
	}

public function toBoolean(): BooleanType
	{
		/** @var BooleanType $type */
		$type = $this->intersectTypes(static function (Type $type): BooleanType {
			return $type->toBoolean();
		});

return $type;
	}

public function toNumber(): Type
	{
		$type = $this->intersectTypes(static function (Type $type): Type {
			return $type->toNumber();
		});

return $type;
	}

public function toString(): Type
	{
		$type = $this->intersectTypes(static function (Type $type): Type {
			return $type->toString();
		});

return $type;
	}

public function toInteger(): Type
	{
		$type = $this->intersectTypes(static function (Type $type): Type {
			return $type->toInteger();
		});

return $type;
	}

public function toFloat(): Type
	{
		$type = $this->intersectTypes(static function (Type $type): Type {
			return $type->toFloat();
		});

return $type;
	}

public function toArray(): Type
	{
		$type = $this->intersectTypes(static function (Type $type): Type {
			return $type->toArray();
		});

return $type;
	}

public function resolveStatic(string $className): Type
	{
		return new self(UnionTypeHelper::resolveStatic($className, $this->getTypes()));
	}

public function changeBaseClass(string $className): StaticResolvableType
	{
		return new self(UnionTypeHelper::changeBaseClass($className, $this->getTypes()));
	}

public function inferTemplateTypes(Type $receivedType): TemplateTypeMap
	{
		$types = TemplateTypeMap::empty();

foreach ($this->types as $type) {
			$receive = $type->isSuperTypeOf($receivedType)->yes() ? $receivedType : new NeverType();
			$types = $types->intersect($type->inferTemplateTypes($receive));
		}

return $types;
	}

public function inferTemplateTypesOn(Type $templateType): TemplateTypeMap
	{
		$types = TemplateTypeMap::empty();

foreach ($this->types as $type) {
			$types = $types->intersect($templateType->inferTemplateTypes($type));
		}

return $types;
	}

public function traverse(callable $cb): Type
	{
		$types = [];
		$changed = false;

foreach ($this->types as $type) {
			$newType = $cb($type);
			if ($type !== $newType) {
				$changed = true;
			}
			$types[] = $newType;
		}

if ($changed) {
			return TypeCombinator::intersect(...$types);
		}

return $this;
	}

/**
	 * @param mixed[] $properties
	 * @return Type
	 */
	public static function __set_state(array $properties): Type
	{
		return new self($properties['types']);
	}

/**
	 * @param callable(Type $type): TrinaryLogic $getResult
	 * @return TrinaryLogic
	 */
	private function intersectResults(callable $getResult): TrinaryLogic
	{
		$operands = array_map($getResult, $this->types);
		return TrinaryLogic::maxMin(...$operands);
	}

/**
	 * @param callable(Type $type): Type $getType
	 * @return Type
	 */
	private function intersectTypes(callable $getType): Type
	{
		$operands = array_map($getType, $this->types);
		return TypeCombinator::intersect(...$operands);
	}

}