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Edit File: ArrayType.php

<?php declare(strict_types = 1);

namespace PHPStan\Type;

use PHPStan\Reflection\ClassMemberAccessAnswerer;
use PHPStan\Reflection\TrivialParametersAcceptor;
use PHPStan\TrinaryLogic;
use PHPStan\Type\Constant\ConstantIntegerType;
use PHPStan\Type\Constant\ConstantStringType;
use PHPStan\Type\Generic\TemplateType;
use PHPStan\Type\Generic\TemplateTypeMap;
use PHPStan\Type\Traits\MaybeCallableTypeTrait;
use PHPStan\Type\Traits\NonObjectTypeTrait;
use PHPStan\Type\Traits\UndecidedBooleanTypeTrait;

class ArrayType implements StaticResolvableType
{

use MaybeCallableTypeTrait;
	use NonObjectTypeTrait;
	use UndecidedBooleanTypeTrait;

/** @var \PHPStan\Type\Type */
	private $keyType;

/** @var \PHPStan\Type\Type */
	private $itemType;

public function __construct(Type $keyType, Type $itemType)
	{
		if ($keyType->describe(VerbosityLevel::value()) === '(int|string)') {
			$keyType = new MixedType();
		}
		$this->keyType = $keyType;
		$this->itemType = $itemType;
	}

public function getKeyType(): Type
	{
		return $this->keyType;
	}

public function getItemType(): Type
	{
		return $this->itemType;
	}

/**
	 * @return string[]
	 */
	public function getReferencedClasses(): array
	{
		return array_merge(
			$this->keyType->getReferencedClasses(),
			$this->getItemType()->getReferencedClasses()
		);
	}

public function accepts(Type $type, bool $strictTypes): TrinaryLogic
	{
		$arrays = TypeUtils::getArrays($type);
		if (count($arrays) > 0) {
			$result = TrinaryLogic::createYes();
			foreach ($arrays as $array) {
				$result = $result
					->and($this->getItemType()->accepts($array->getItemType(), $strictTypes))
					->and($this->keyType->accepts($array->keyType, $strictTypes));
			}

return $result;
		}

if ($type instanceof CompoundType) {
			return CompoundTypeHelper::accepts($type, $this, $strictTypes);
		}

return TrinaryLogic::createNo();
	}

public function isSuperTypeOf(Type $type): TrinaryLogic
	{
		if ($type instanceof self) {
			return $this->getItemType()->isSuperTypeOf($type->getItemType())
				->and($this->keyType->isSuperTypeOf($type->keyType));
		}

if ($type instanceof CompoundType) {
			return $type->isSubTypeOf($this);
		}

return TrinaryLogic::createNo();
	}

public function equals(Type $type): bool
	{
		return $type instanceof self
			&& $this->getItemType()->equals($type->getItemType())
			&& $this->keyType->equals($type->keyType);
	}

public function describe(VerbosityLevel $level): string
	{
		$isMixedKeyType = $this->keyType instanceof MixedType && !$this->keyType instanceof TemplateType;
		$isMixedItemType = $this->itemType instanceof MixedType && !$this->itemType instanceof TemplateType;

if ($isMixedKeyType || $this->keyType instanceof NeverType) {
			if ($isMixedItemType || $this->itemType instanceof NeverType) {
				return 'array';
			}

return sprintf('array<%s>', $this->itemType->describe($level));
		}

return sprintf('array<%s, %s>', $this->keyType->describe($level), $this->itemType->describe($level));
	}

public function generalizeValues(): self
	{
		return new self($this->keyType, TypeUtils::generalizeType($this->itemType));
	}

public function getKeysArray(): self
	{
		return new self(new IntegerType(), $this->keyType);
	}

public function getValuesArray(): self
	{
		return new self(new IntegerType(), $this->itemType);
	}

public function resolveStatic(string $className): Type
	{
		if ($this->getItemType() instanceof StaticResolvableType) {
			return new self(
				$this->keyType,
				$this->getItemType()->resolveStatic($className)
			);
		}

return $this;
	}

public function changeBaseClass(string $className): StaticResolvableType
	{
		if ($this->getItemType() instanceof StaticResolvableType) {
			return new self(
				$this->keyType,
				$this->getItemType()->changeBaseClass($className)
			);
		}

return $this;
	}

public function isIterable(): TrinaryLogic
	{
		return TrinaryLogic::createYes();
	}

public function isIterableAtLeastOnce(): TrinaryLogic
	{
		return TrinaryLogic::createMaybe();
	}

public function getIterableKeyType(): Type
	{
		$keyType = $this->keyType;
		if ($keyType instanceof MixedType) {
			return new BenevolentUnionType([new IntegerType(), new StringType()]);
		}

return $keyType;
	}

public function getIterableValueType(): Type
	{
		return $this->getItemType();
	}

public function isArray(): TrinaryLogic
	{
		return TrinaryLogic::createYes();
	}

public function isOffsetAccessible(): TrinaryLogic
	{
		return TrinaryLogic::createYes();
	}

public function hasOffsetValueType(Type $offsetType): TrinaryLogic
	{
		$offsetType = self::castToArrayKeyType($offsetType);
		if ($this->getKeyType()->isSuperTypeOf($offsetType)->no()) {
			return TrinaryLogic::createNo();
		}

return TrinaryLogic::createMaybe();
	}

public function getOffsetValueType(Type $offsetType): Type
	{
		$offsetType = self::castToArrayKeyType($offsetType);
		if ($this->getKeyType()->isSuperTypeOf($offsetType)->no()) {
			return new ErrorType();
		}

$type = $this->getItemType();
		if ($type instanceof ErrorType) {
			return new MixedType();
		}

return $type;
	}

public function setOffsetValueType(?Type $offsetType, Type $valueType): Type
	{
		if ($offsetType === null) {
			$offsetType = new IntegerType();
		}

return new ArrayType(
			TypeCombinator::union($this->keyType, self::castToArrayKeyType($offsetType)),
			TypeCombinator::union($this->itemType, $valueType)
		);
	}

public function isCallable(): TrinaryLogic
	{
		return TrinaryLogic::createMaybe()->and((new StringType())->isSuperTypeOf($this->itemType));
	}

/**
	 * @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 toNumber(): Type
	{
		return new ErrorType();
	}

public function toString(): Type
	{
		return new ErrorType();
	}

public function toInteger(): Type
	{
		return new ErrorType();
	}

public function toFloat(): Type
	{
		return new ErrorType();
	}

public function toArray(): Type
	{
		return $this;
	}

public function count(): Type
	{
		return new IntegerType();
	}

public static function castToArrayKeyType(Type $offsetType): Type
	{
		if ($offsetType instanceof UnionType) {
			return TypeCombinator::union(...array_map(static function (Type $type): Type {
				return self::castToArrayKeyType($type);
			}, $offsetType->getTypes()));
		}

if ($offsetType instanceof ConstantScalarType) {
			/** @var int|string $offsetValue */
			$offsetValue = key([$offsetType->getValue() => null]);
			return is_int($offsetValue) ? new ConstantIntegerType($offsetValue) : new ConstantStringType($offsetValue);
		}

if ($offsetType instanceof IntegerType || $offsetType instanceof FloatType || $offsetType instanceof BooleanType) {
			return new IntegerType();
		}

if ($offsetType instanceof StringType) {
			return new StringType();
		}

return new UnionType([new IntegerType(), new StringType()]);
	}

public function inferTemplateTypes(Type $receivedType): TemplateTypeMap
	{
		if ($receivedType instanceof UnionType || $receivedType instanceof IntersectionType) {
			return $receivedType->inferTemplateTypesOn($this);
		}

if (
			$receivedType instanceof ArrayType
			&& !$this->getKeyType()->isSuperTypeOf($receivedType->getKeyType())->no()
			&& !$this->getItemType()->isSuperTypeOf($receivedType->getItemType())->no()
		) {
			$receivedKey = $receivedType->getKeyType();
			$receivedItem = $receivedType->getItemType();
		} else {
			$receivedKey = new NeverType();
			$receivedItem = new NeverType();
		}

$keyTypeMap = $this->getKeyType()->inferTemplateTypes($receivedKey);
		$itemTypeMap = $this->getItemType()->inferTemplateTypes($receivedItem);

return $keyTypeMap->union($itemTypeMap);
	}

public function traverse(callable $cb): Type
	{
		$keyType = $cb($this->keyType);
		$itemType = $cb($this->itemType);

if ($keyType !== $this->keyType || $itemType !== $this->itemType) {
			return new self($keyType, $itemType);
		}

return $this;
	}

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

}