AccessoryLiteralStringType.php

<?php declare(strict_types = 1);

namespace PHPStan\Type\Accessory;

use PHPStan\TrinaryLogic;
use PHPStan\Type\BooleanType;
use PHPStan\Type\CompoundType;
use PHPStan\Type\Constant\ConstantArrayType;
use PHPStan\Type\Constant\ConstantIntegerType;
use PHPStan\Type\ErrorType;
use PHPStan\Type\FloatType;
use PHPStan\Type\GeneralizePrecision;
use PHPStan\Type\IntegerType;
use PHPStan\Type\IntersectionType;
use PHPStan\Type\MixedType;
use PHPStan\Type\StringType;
use PHPStan\Type\Traits\MaybeCallableTypeTrait;
use PHPStan\Type\Traits\NonGenericTypeTrait;
use PHPStan\Type\Traits\NonIterableTypeTrait;
use PHPStan\Type\Traits\NonObjectTypeTrait;
use PHPStan\Type\Traits\NonRemoveableTypeTrait;
use PHPStan\Type\Traits\UndecidedComparisonCompoundTypeTrait;
use PHPStan\Type\Type;
use PHPStan\Type\UnionType;
use PHPStan\Type\VerbosityLevel;

class AccessoryLiteralStringType implements CompoundType, AccessoryType
{

	use MaybeCallableTypeTrait;
	use NonObjectTypeTrait;
	use NonIterableTypeTrait;
	use UndecidedComparisonCompoundTypeTrait;
	use NonGenericTypeTrait;
	use NonRemoveableTypeTrait;

	/** @api */
	public function __construct()
	{
	}

	public function getReferencedClasses(): array
	{
		return [];
	}

	public function accepts(Type $type, bool $strictTypes): TrinaryLogic
	{
		if ($type instanceof MixedType) {
			return TrinaryLogic::createNo();
		}
		if ($type instanceof CompoundType) {
			return $type->isAcceptedBy($this, $strictTypes);
		}

		return $type->isLiteralString();
	}

	public function isSuperTypeOf(Type $type): TrinaryLogic
	{
		if ($type instanceof CompoundType) {
			return $type->isSubTypeOf($this);
		}

		if ($this->equals($type)) {
			return TrinaryLogic::createYes();
		}

		return $type->isLiteralString();
	}

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

		return $otherType->isLiteralString()
			->and($otherType instanceof self ? TrinaryLogic::createYes() : TrinaryLogic::createMaybe());
	}

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

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

	public function describe(VerbosityLevel $level): string
	{
		return 'literal-string';
	}

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

	public function hasOffsetValueType(Type $offsetType): TrinaryLogic
	{
		return (new IntegerType())->isSuperTypeOf($offsetType)->and(TrinaryLogic::createMaybe());
	}

	public function getOffsetValueType(Type $offsetType): Type
	{
		if ($this->hasOffsetValueType($offsetType)->no()) {
			return new ErrorType();
		}

		return new StringType();
	}

	public function setOffsetValueType(?Type $offsetType, Type $valueType, bool $unionValues = true): Type
	{
		return $this;
	}

	public function unsetOffset(Type $offsetType): Type
	{
		return new ErrorType();
	}

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

	public function toNumber(): Type
	{
		return new UnionType([
			$this->toInteger(),
			$this->toFloat(),
		]);
	}

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

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

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

	public function toBoolean(): BooleanType
	{
		return new BooleanType();
	}

	public function toArray(): Type
	{
		return new ConstantArrayType(
			[new ConstantIntegerType(0)],
			[$this],
			1,
		);
	}

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

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

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

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

	public function traverse(callable $cb): Type
	{
		return $this;
	}

	public function generalize(GeneralizePrecision $precision): Type
	{
		return new StringType();
	}

	public static function __set_state(array $properties): Type
	{
		return new self();
	}

}