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TypeSpecifier.php
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<?php declare(strict_types = 1);
namespace PHPStan\Analyser;
use Countable;
use PhpParser\Node;
use PhpParser\Node\Expr;
use PhpParser\Node\Expr\ArrayDimFetch;
use PhpParser\Node\Expr\BinaryOp\BooleanAnd;
use PhpParser\Node\Expr\BinaryOp\BooleanOr;
use PhpParser\Node\Expr\BinaryOp\LogicalAnd;
use PhpParser\Node\Expr\BinaryOp\LogicalOr;
use PhpParser\Node\Expr\ClassConstFetch;
use PhpParser\Node\Expr\ConstFetch;
use PhpParser\Node\Expr\FuncCall;
use PhpParser\Node\Expr\Instanceof_;
use PhpParser\Node\Expr\MethodCall;
use PhpParser\Node\Expr\PropertyFetch;
use PhpParser\Node\Expr\StaticCall;
use PhpParser\Node\Expr\StaticPropertyFetch;
use PhpParser\Node\Name;
use PHPStan\Node\Expr\AlwaysRememberedExpr;
use PHPStan\Node\IssetExpr;
use PHPStan\Node\Printer\ExprPrinter;
use PHPStan\Php\PhpVersion;
use PHPStan\Reflection\Assertions;
use PHPStan\Reflection\ExtendedParametersAcceptor;
use PHPStan\Reflection\ParametersAcceptor;
use PHPStan\Reflection\ParametersAcceptorSelector;
use PHPStan\Reflection\ReflectionProvider;
use PHPStan\Reflection\ResolvedFunctionVariant;
use PHPStan\Rules\Arrays\AllowedArrayKeysTypes;
use PHPStan\ShouldNotHappenException;
use PHPStan\TrinaryLogic;
use PHPStan\Type\Accessory\AccessoryArrayListType;
use PHPStan\Type\Accessory\AccessoryNonEmptyStringType;
use PHPStan\Type\Accessory\AccessoryNonFalsyStringType;
use PHPStan\Type\Accessory\HasOffsetType;
use PHPStan\Type\Accessory\HasPropertyType;
use PHPStan\Type\Accessory\NonEmptyArrayType;
use PHPStan\Type\ArrayType;
use PHPStan\Type\BooleanType;
use PHPStan\Type\ConditionalTypeForParameter;
use PHPStan\Type\Constant\ConstantArrayType;
use PHPStan\Type\Constant\ConstantArrayTypeBuilder;
use PHPStan\Type\Constant\ConstantBooleanType;
use PHPStan\Type\Constant\ConstantFloatType;
use PHPStan\Type\Constant\ConstantIntegerType;
use PHPStan\Type\Constant\ConstantStringType;
use PHPStan\Type\ConstantScalarType;
use PHPStan\Type\FloatType;
use PHPStan\Type\FunctionTypeSpecifyingExtension;
use PHPStan\Type\Generic\GenericClassStringType;
use PHPStan\Type\Generic\TemplateType;
use PHPStan\Type\Generic\TemplateTypeHelper;
use PHPStan\Type\Generic\TemplateTypeVariance;
use PHPStan\Type\Generic\TemplateTypeVarianceMap;
use PHPStan\Type\IntegerRangeType;
use PHPStan\Type\IntegerType;
use PHPStan\Type\IntersectionType;
use PHPStan\Type\MethodTypeSpecifyingExtension;
use PHPStan\Type\MixedType;
use PHPStan\Type\NeverType;
use PHPStan\Type\NonexistentParentClassType;
use PHPStan\Type\NullType;
use PHPStan\Type\ObjectType;
use PHPStan\Type\ObjectWithoutClassType;
use PHPStan\Type\ResourceType;
use PHPStan\Type\StaticMethodTypeSpecifyingExtension;
use PHPStan\Type\StaticType;
use PHPStan\Type\StaticTypeFactory;
use PHPStan\Type\StringType;
use PHPStan\Type\Type;
use PHPStan\Type\TypeCombinator;
use PHPStan\Type\TypeTraverser;
use PHPStan\Type\UnionType;
use function array_key_exists;
use function array_map;
use function array_merge;
use function array_reverse;
use function array_shift;
use function count;
use function in_array;
use function is_string;
use function strtolower;
use function substr;
use const COUNT_NORMAL;
final class TypeSpecifier
{
/** @var MethodTypeSpecifyingExtension[][]|null */
private ?array $methodTypeSpecifyingExtensionsByClass = null;
/** @var StaticMethodTypeSpecifyingExtension[][]|null */
private ?array $staticMethodTypeSpecifyingExtensionsByClass = null;
/**
* @param FunctionTypeSpecifyingExtension[] $functionTypeSpecifyingExtensions
* @param MethodTypeSpecifyingExtension[] $methodTypeSpecifyingExtensions
* @param StaticMethodTypeSpecifyingExtension[] $staticMethodTypeSpecifyingExtensions
*/
public function __construct(
private ExprPrinter $exprPrinter,
private ReflectionProvider $reflectionProvider,
private PhpVersion $phpVersion,
private array $functionTypeSpecifyingExtensions,
private array $methodTypeSpecifyingExtensions,
private array $staticMethodTypeSpecifyingExtensions,
private bool $rememberPossiblyImpureFunctionValues,
)
{
foreach (array_merge($functionTypeSpecifyingExtensions, $methodTypeSpecifyingExtensions, $staticMethodTypeSpecifyingExtensions) as $extension) {
if (!($extension instanceof TypeSpecifierAwareExtension)) {
continue;
}
$extension->setTypeSpecifier($this);
}
}
/** @api */
public function specifyTypesInCondition(
Scope $scope,
Expr $expr,
TypeSpecifierContext $context,
): SpecifiedTypes
{
if ($expr instanceof Expr\CallLike && $expr->isFirstClassCallable()) {
return (new SpecifiedTypes([], []))->setRootExpr($expr);
}
if ($expr instanceof Instanceof_) {
$exprNode = $expr->expr;
if ($expr->class instanceof Name) {
$className = (string) $expr->class;
$lowercasedClassName = strtolower($className);
if ($lowercasedClassName === 'self' && $scope->isInClass()) {
$type = new ObjectType($scope->getClassReflection()->getName());
} elseif ($lowercasedClassName === 'static' && $scope->isInClass()) {
$type = new StaticType($scope->getClassReflection());
} elseif ($lowercasedClassName === 'parent') {
if (
$scope->isInClass()
&& $scope->getClassReflection()->getParentClass() !== null
) {
$type = new ObjectType($scope->getClassReflection()->getParentClass()->getName());
} else {
$type = new NonexistentParentClassType();
}
} else {
$type = new ObjectType($className);
}
return $this->create($exprNode, $type, $context, $scope)->setRootExpr($expr);
}
$classType = $scope->getType($expr->class);
$uncertainty = false;
$type = TypeTraverser::map($classType, static function (Type $type, callable $traverse) use (&$uncertainty): Type {
if ($type instanceof UnionType || $type instanceof IntersectionType) {
return $traverse($type);
}
if ($type->getObjectClassNames() !== []) {
$uncertainty = true;
return $type;
}
if ($type instanceof GenericClassStringType) {
$uncertainty = true;
return $type->getGenericType();
}
if ($type instanceof ConstantStringType) {
return new ObjectType($type->getValue());
}
return new MixedType();
});
if (!$type->isSuperTypeOf(new MixedType())->yes()) {
if ($context->true()) {
$type = TypeCombinator::intersect(
$type,
new ObjectWithoutClassType(),
);
return $this->create($exprNode, $type, $context, $scope)->setRootExpr($expr);
} elseif ($context->false() && !$uncertainty) {
$exprType = $scope->getType($expr->expr);
if (!$type->isSuperTypeOf($exprType)->yes()) {
return $this->create($exprNode, $type, $context, $scope)->setRootExpr($expr);
}
}
}
if ($context->true()) {
return $this->create($exprNode, new ObjectWithoutClassType(), $context, $scope)->setRootExpr($exprNode);
}
} elseif ($expr instanceof Node\Expr\BinaryOp\Identical) {
return $this->resolveIdentical($expr, $scope, $context);
} elseif ($expr instanceof Node\Expr\BinaryOp\NotIdentical) {
return $this->specifyTypesInCondition(
$scope,
new Node\Expr\BooleanNot(new Node\Expr\BinaryOp\Identical($expr->left, $expr->right)),
$context,
)->setRootExpr($expr);
} elseif ($expr instanceof Expr\Cast\Bool_) {
return $this->specifyTypesInCondition(
$scope,
new Node\Expr\BinaryOp\Equal($expr->expr, new ConstFetch(new Name\FullyQualified('true'))),
$context,
)->setRootExpr($expr);
} elseif ($expr instanceof Expr\Cast\String_) {
return $this->specifyTypesInCondition(
$scope,
new Node\Expr\BinaryOp\NotEqual($expr->expr, new Node\Scalar\String_('')),
$context,
)->setRootExpr($expr);
} elseif ($expr instanceof Expr\Cast\Int_) {
return $this->specifyTypesInCondition(
$scope,
new Node\Expr\BinaryOp\NotEqual($expr->expr, new Node\Scalar\LNumber(0)),
$context,
)->setRootExpr($expr);
} elseif ($expr instanceof Expr\Cast\Double) {
return $this->specifyTypesInCondition(
$scope,
new Node\Expr\BinaryOp\NotEqual($expr->expr, new Node\Scalar\DNumber(0.0)),
$context,
)->setRootExpr($expr);
} elseif ($expr instanceof Node\Expr\BinaryOp\Equal) {
return $this->resolveEqual($expr, $scope, $context);
} elseif ($expr instanceof Node\Expr\BinaryOp\NotEqual) {
return $this->specifyTypesInCondition(
$scope,
new Node\Expr\BooleanNot(new Node\Expr\BinaryOp\Equal($expr->left, $expr->right)),
$context,
)->setRootExpr($expr);
} elseif ($expr instanceof Node\Expr\BinaryOp\Smaller || $expr instanceof Node\Expr\BinaryOp\SmallerOrEqual) {
if (
$expr->left instanceof FuncCall
&& count($expr->left->getArgs()) >= 1
&& $expr->left->name instanceof Name
&& in_array(strtolower((string) $expr->left->name), ['count', 'sizeof', 'strlen', 'mb_strlen', 'preg_match'], true)
&& (
!$expr->right instanceof FuncCall
|| !$expr->right->name instanceof Name
|| !in_array(strtolower((string) $expr->right->name), ['count', 'sizeof', 'strlen', 'mb_strlen', 'preg_match'], true)
)
) {
$inverseOperator = $expr instanceof Node\Expr\BinaryOp\Smaller
? new Node\Expr\BinaryOp\SmallerOrEqual($expr->right, $expr->left)
: new Node\Expr\BinaryOp\Smaller($expr->right, $expr->left);
return $this->specifyTypesInCondition(
$scope,
new Node\Expr\BooleanNot($inverseOperator),
$context,
)->setRootExpr($expr);
}
$orEqual = $expr instanceof Node\Expr\BinaryOp\SmallerOrEqual;
$offset = $orEqual ? 0 : 1;
$leftType = $scope->getType($expr->left);
$result = (new SpecifiedTypes([], []))->setRootExpr($expr);
if (
!$context->null()
&& $expr->right instanceof FuncCall
&& count($expr->right->getArgs()) >= 1
&& $expr->right->name instanceof Name
&& in_array(strtolower((string) $expr->right->name), ['count', 'sizeof'], true)
&& $leftType->isInteger()->yes()
) {
$argType = $scope->getType($expr->right->getArgs()[0]->value);
if ($leftType instanceof ConstantIntegerType) {
if ($orEqual) {
$sizeType = IntegerRangeType::createAllGreaterThanOrEqualTo($leftType->getValue());
} else {
$sizeType = IntegerRangeType::createAllGreaterThan($leftType->getValue());
}
} elseif ($leftType instanceof IntegerRangeType) {
$sizeType = $leftType->shift($offset);
} else {
$sizeType = $leftType;
}
$specifiedTypes = $this->specifyTypesForCountFuncCall($expr->right, $argType, $sizeType, $context, $scope, $expr);
if ($specifiedTypes !== null) {
$result = $result->unionWith($specifiedTypes);
}
if (
$context->true() && (IntegerRangeType::createAllGreaterThanOrEqualTo(1 - $offset)->isSuperTypeOf($leftType)->yes())
|| ($context->false() && (new ConstantIntegerType(1 - $offset))->isSuperTypeOf($leftType)->yes())
) {
if ($context->truthy() && $argType->isArray()->maybe()) {
$countables = [];
if ($argType instanceof UnionType) {
$countableInterface = new ObjectType(Countable::class);
foreach ($argType->getTypes() as $innerType) {
if ($innerType->isArray()->yes()) {
$innerType = TypeCombinator::intersect(new NonEmptyArrayType(), $innerType);
$countables[] = $innerType;
}
if (!$countableInterface->isSuperTypeOf($innerType)->yes()) {
continue;
}
$countables[] = $innerType;
}
}
if (count($countables) > 0) {
$countableType = TypeCombinator::union(...$countables);
return $this->create($expr->right->getArgs()[0]->value, $countableType, $context, $scope)->setRootExpr($expr);
}
}
if ($argType->isArray()->yes()) {
$newType = new NonEmptyArrayType();
if ($context->true() && $argType->isList()->yes()) {
$newType = TypeCombinator::intersect($newType, new AccessoryArrayListType());
}
$result = $result->unionWith(
$this->create($expr->right->getArgs()[0]->value, $newType, $context, $scope)->setRootExpr($expr),
);
}
}
}
if (
!$context->null()
&& $expr->right instanceof FuncCall
&& count($expr->right->getArgs()) >= 3
&& $expr->right->name instanceof Name
&& in_array(strtolower((string) $expr->right->name), ['preg_match'], true)
&& IntegerRangeType::fromInterval(0, null)->isSuperTypeOf($leftType)->yes()
) {
return $this->specifyTypesInCondition(
$scope,
new Expr\BinaryOp\NotIdentical($expr->right, new ConstFetch(new Name('false'))),
$context,
)->setRootExpr($expr);
}
if (
!$context->null()
&& $expr->right instanceof FuncCall
&& count($expr->right->getArgs()) === 1
&& $expr->right->name instanceof Name
&& in_array(strtolower((string) $expr->right->name), ['strlen', 'mb_strlen'], true)
&& $leftType->isInteger()->yes()
) {
if (
$context->true() && (IntegerRangeType::createAllGreaterThanOrEqualTo(1 - $offset)->isSuperTypeOf($leftType)->yes())
|| ($context->false() && (new ConstantIntegerType(1 - $offset))->isSuperTypeOf($leftType)->yes())
) {
$argType = $scope->getType($expr->right->getArgs()[0]->value);
if ($argType->isString()->yes()) {
$accessory = new AccessoryNonEmptyStringType();
if (IntegerRangeType::createAllGreaterThanOrEqualTo(2 - $offset)->isSuperTypeOf($leftType)->yes()) {
$accessory = new AccessoryNonFalsyStringType();
}
$result = $result->unionWith($this->create($expr->right->getArgs()[0]->value, $accessory, $context, $scope)->setRootExpr($expr));
}
}
}
if ($leftType instanceof ConstantIntegerType) {
if ($expr->right instanceof Expr\PostInc) {
$result = $result->unionWith($this->createRangeTypes(
$expr,
$expr->right->var,
IntegerRangeType::fromInterval($leftType->getValue(), null, $offset + 1),
$context,
));
} elseif ($expr->right instanceof Expr\PostDec) {
$result = $result->unionWith($this->createRangeTypes(
$expr,
$expr->right->var,
IntegerRangeType::fromInterval($leftType->getValue(), null, $offset - 1),
$context,
));
} elseif ($expr->right instanceof Expr\PreInc || $expr->right instanceof Expr\PreDec) {
$result = $result->unionWith($this->createRangeTypes(
$expr,
$expr->right->var,
IntegerRangeType::fromInterval($leftType->getValue(), null, $offset),
$context,
));
}
}
$rightType = $scope->getType($expr->right);
if ($rightType instanceof ConstantIntegerType) {
if ($expr->left instanceof Expr\PostInc) {
$result = $result->unionWith($this->createRangeTypes(
$expr,
$expr->left->var,
IntegerRangeType::fromInterval(null, $rightType->getValue(), -$offset + 1),
$context,
));
} elseif ($expr->left instanceof Expr\PostDec) {
$result = $result->unionWith($this->createRangeTypes(
$expr,
$expr->left->var,
IntegerRangeType::fromInterval(null, $rightType->getValue(), -$offset - 1),
$context,
));
} elseif ($expr->left instanceof Expr\PreInc || $expr->left instanceof Expr\PreDec) {
$result = $result->unionWith($this->createRangeTypes(
$expr,
$expr->left->var,
IntegerRangeType::fromInterval(null, $rightType->getValue(), -$offset),
$context,
));
}
}
if ($context->true()) {
if (!$expr->left instanceof Node\Scalar) {
$result = $result->unionWith(
$this->create(
$expr->left,
$orEqual ? $rightType->getSmallerOrEqualType($this->phpVersion) : $rightType->getSmallerType($this->phpVersion),
TypeSpecifierContext::createTruthy(),
$scope,
)->setRootExpr($expr),
);
}
if (!$expr->right instanceof Node\Scalar) {
$result = $result->unionWith(
$this->create(
$expr->right,
$orEqual ? $leftType->getGreaterOrEqualType($this->phpVersion) : $leftType->getGreaterType($this->phpVersion),
TypeSpecifierContext::createTruthy(),
$scope,
)->setRootExpr($expr),
);
}
} elseif ($context->false()) {
if (!$expr->left instanceof Node\Scalar) {
$result = $result->unionWith(
$this->create(
$expr->left,
$orEqual ? $rightType->getGreaterType($this->phpVersion) : $rightType->getGreaterOrEqualType($this->phpVersion),
TypeSpecifierContext::createTruthy(),
$scope,
)->setRootExpr($expr),
);
}
if (!$expr->right instanceof Node\Scalar) {
$result = $result->unionWith(
$this->create(
$expr->right,
$orEqual ? $leftType->getSmallerType($this->phpVersion) : $leftType->getSmallerOrEqualType($this->phpVersion),
TypeSpecifierContext::createTruthy(),
$scope,
)->setRootExpr($expr),
);
}
}
return $result;
} elseif ($expr instanceof Node\Expr\BinaryOp\Greater) {
return $this->specifyTypesInCondition($scope, new Expr\BinaryOp\Smaller($expr->right, $expr->left), $context)->setRootExpr($expr);
} elseif ($expr instanceof Node\Expr\BinaryOp\GreaterOrEqual) {
return $this->specifyTypesInCondition($scope, new Expr\BinaryOp\SmallerOrEqual($expr->right, $expr->left), $context)->setRootExpr($expr);
} elseif ($expr instanceof FuncCall && $expr->name instanceof Name) {
if ($this->reflectionProvider->hasFunction($expr->name, $scope)) {
$functionReflection = $this->reflectionProvider->getFunction($expr->name, $scope);
foreach ($this->getFunctionTypeSpecifyingExtensions() as $extension) {
if (!$extension->isFunctionSupported($functionReflection, $expr, $context)) {
continue;
}
return $extension->specifyTypes($functionReflection, $expr, $scope, $context);
}
// lazy create parametersAcceptor, as creation can be expensive
$parametersAcceptor = null;
if (count($expr->getArgs()) > 0) {
$parametersAcceptor = ParametersAcceptorSelector::selectFromArgs($scope, $expr->getArgs(), $functionReflection->getVariants(), $functionReflection->getNamedArgumentsVariants());
$specifiedTypes = $this->specifyTypesFromConditionalReturnType($context, $expr, $parametersAcceptor, $scope);
if ($specifiedTypes !== null) {
return $specifiedTypes;
}
}
$assertions = $functionReflection->getAsserts();
if ($assertions->getAll() !== []) {
$parametersAcceptor ??= ParametersAcceptorSelector::selectFromArgs($scope, $expr->getArgs(), $functionReflection->getVariants(), $functionReflection->getNamedArgumentsVariants());
$asserts = $assertions->mapTypes(static fn (Type $type) => TemplateTypeHelper::resolveTemplateTypes(
$type,
$parametersAcceptor->getResolvedTemplateTypeMap(),
$parametersAcceptor instanceof ExtendedParametersAcceptor ? $parametersAcceptor->getCallSiteVarianceMap() : TemplateTypeVarianceMap::createEmpty(),
TemplateTypeVariance::createInvariant(),
));
$specifiedTypes = $this->specifyTypesFromAsserts($context, $expr, $asserts, $parametersAcceptor, $scope);
if ($specifiedTypes !== null) {
return $specifiedTypes;
}
}
}
return $this->handleDefaultTruthyOrFalseyContext($context, $expr, $scope);
} elseif ($expr instanceof MethodCall && $expr->name instanceof Node\Identifier) {
$methodCalledOnType = $scope->getType($expr->var);
$methodReflection = $scope->getMethodReflection($methodCalledOnType, $expr->name->name);
if ($methodReflection !== null) {
$referencedClasses = $methodCalledOnType->getObjectClassNames();
$specifiedTypes = null;
foreach ($referencedClasses as $referencedClass) {
if (!$this->reflectionProvider->hasClass($referencedClass)) {
continue;
}
$methodClassReflection = $this->reflectionProvider->getClass($referencedClass);
foreach ($this->getMethodTypeSpecifyingExtensionsForClass($methodClassReflection->getName()) as $extension) {
if (!$extension->isMethodSupported($methodReflection, $expr, $context)) {
continue;
}
if ($specifiedTypes !== null) {
$specifiedTypes = $specifiedTypes->unionWith($extension->specifyTypes($methodReflection, $expr, $scope, $context));
} else {
$specifiedTypes = $extension->specifyTypes($methodReflection, $expr, $scope, $context);
}
}
}
if ($specifiedTypes !== null) {
return $specifiedTypes;
}
// lazy create parametersAcceptor, as creation can be expensive
$parametersAcceptor = null;
if (count($expr->getArgs()) > 0) {
$parametersAcceptor = ParametersAcceptorSelector::selectFromArgs($scope, $expr->getArgs(), $methodReflection->getVariants(), $methodReflection->getNamedArgumentsVariants());
$specifiedTypes = $this->specifyTypesFromConditionalReturnType($context, $expr, $parametersAcceptor, $scope);
if ($specifiedTypes !== null) {
return $specifiedTypes;
}
}
$assertions = $methodReflection->getAsserts();
if ($assertions->getAll() !== []) {
$parametersAcceptor ??= ParametersAcceptorSelector::selectFromArgs($scope, $expr->getArgs(), $methodReflection->getVariants(), $methodReflection->getNamedArgumentsVariants());
$asserts = $assertions->mapTypes(static fn (Type $type) => TemplateTypeHelper::resolveTemplateTypes(
$type,
$parametersAcceptor->getResolvedTemplateTypeMap(),
$parametersAcceptor instanceof ExtendedParametersAcceptor ? $parametersAcceptor->getCallSiteVarianceMap() : TemplateTypeVarianceMap::createEmpty(),
TemplateTypeVariance::createInvariant(),
));
$specifiedTypes = $this->specifyTypesFromAsserts($context, $expr, $asserts, $parametersAcceptor, $scope);
if ($specifiedTypes !== null) {
return $specifiedTypes;
}
}
}
return $this->handleDefaultTruthyOrFalseyContext($context, $expr, $scope);
} elseif ($expr instanceof StaticCall && $expr->name instanceof Node\Identifier) {
if ($expr->class instanceof Name) {
$calleeType = $scope->resolveTypeByName($expr->class);
} else {
$calleeType = $scope->getType($expr->class);
}
$staticMethodReflection = $scope->getMethodReflection($calleeType, $expr->name->name);
if ($staticMethodReflection !== null) {
$referencedClasses = $calleeType->getObjectClassNames();
$specifiedTypes = null;
foreach ($referencedClasses as $referencedClass) {
if (!$this->reflectionProvider->hasClass($referencedClass)) {
continue;
}
$staticMethodClassReflection = $this->reflectionProvider->getClass($referencedClass);
foreach ($this->getStaticMethodTypeSpecifyingExtensionsForClass($staticMethodClassReflection->getName()) as $extension) {
if (!$extension->isStaticMethodSupported($staticMethodReflection, $expr, $context)) {
continue;
}
if ($specifiedTypes !== null) {
$specifiedTypes = $specifiedTypes->unionWith($extension->specifyTypes($staticMethodReflection, $expr, $scope, $context));
} else {
$specifiedTypes = $extension->specifyTypes($staticMethodReflection, $expr, $scope, $context);
}
}
}
if ($specifiedTypes !== null) {
return $specifiedTypes;
}
// lazy create parametersAcceptor, as creation can be expensive
$parametersAcceptor = null;
if (count($expr->getArgs()) > 0) {
$parametersAcceptor = ParametersAcceptorSelector::selectFromArgs($scope, $expr->getArgs(), $staticMethodReflection->getVariants(), $staticMethodReflection->getNamedArgumentsVariants());
$specifiedTypes = $this->specifyTypesFromConditionalReturnType($context, $expr, $parametersAcceptor, $scope);
if ($specifiedTypes !== null) {
return $specifiedTypes;
}
}
$assertions = $staticMethodReflection->getAsserts();
if ($assertions->getAll() !== []) {
$parametersAcceptor ??= ParametersAcceptorSelector::selectFromArgs($scope, $expr->getArgs(), $staticMethodReflection->getVariants(), $staticMethodReflection->getNamedArgumentsVariants());
$asserts = $assertions->mapTypes(static fn (Type $type) => TemplateTypeHelper::resolveTemplateTypes(
$type,
$parametersAcceptor->getResolvedTemplateTypeMap(),
$parametersAcceptor instanceof ExtendedParametersAcceptor ? $parametersAcceptor->getCallSiteVarianceMap() : TemplateTypeVarianceMap::createEmpty(),
TemplateTypeVariance::createInvariant(),
));
$specifiedTypes = $this->specifyTypesFromAsserts($context, $expr, $asserts, $parametersAcceptor, $scope);
if ($specifiedTypes !== null) {
return $specifiedTypes;
}
}
}
return $this->handleDefaultTruthyOrFalseyContext($context, $expr, $scope);
} elseif ($expr instanceof BooleanAnd || $expr instanceof LogicalAnd) {
if (!$scope instanceof MutatingScope) {
throw new ShouldNotHappenException();
}
$leftTypes = $this->specifyTypesInCondition($scope, $expr->left, $context)->setRootExpr($expr);
$rightScope = $scope->filterByTruthyValue($expr->left);
$rightTypes = $this->specifyTypesInCondition($rightScope, $expr->right, $context)->setRootExpr($expr);
$types = $context->true() ? $leftTypes->unionWith($rightTypes) : $leftTypes->normalize($scope)->intersectWith($rightTypes->normalize($rightScope));
if ($context->false()) {
return (new SpecifiedTypes(
$types->getSureTypes(),
$types->getSureNotTypes(),
))->setNewConditionalExpressionHolders(array_merge(
$this->processBooleanNotSureConditionalTypes($scope, $leftTypes, $rightTypes),
$this->processBooleanNotSureConditionalTypes($scope, $rightTypes, $leftTypes),
$this->processBooleanSureConditionalTypes($scope, $leftTypes, $rightTypes),
$this->processBooleanSureConditionalTypes($scope, $rightTypes, $leftTypes),
))->setRootExpr($expr);
}
return $types;
} elseif ($expr instanceof BooleanOr || $expr instanceof LogicalOr) {
if (!$scope instanceof MutatingScope) {
throw new ShouldNotHappenException();
}
$leftTypes = $this->specifyTypesInCondition($scope, $expr->left, $context)->setRootExpr($expr);
$rightScope = $scope->filterByFalseyValue($expr->left);
$rightTypes = $this->specifyTypesInCondition($rightScope, $expr->right, $context)->setRootExpr($expr);
$types = $context->true() ? $leftTypes->normalize($scope)->intersectWith($rightTypes->normalize($rightScope)) : $leftTypes->unionWith($rightTypes);
if ($context->true()) {
return (new SpecifiedTypes(
$types->getSureTypes(),
$types->getSureNotTypes(),
))->setNewConditionalExpressionHolders(array_merge(
$this->processBooleanNotSureConditionalTypes($scope, $leftTypes, $rightTypes),
$this->processBooleanNotSureConditionalTypes($scope, $rightTypes, $leftTypes),
$this->processBooleanSureConditionalTypes($scope, $leftTypes, $rightTypes),
$this->processBooleanSureConditionalTypes($scope, $rightTypes, $leftTypes),
))->setRootExpr($expr);
}
return $types;
} elseif ($expr instanceof Node\Expr\BooleanNot && !$context->null()) {
return $this->specifyTypesInCondition($scope, $expr->expr, $context->negate())->setRootExpr($expr);
} elseif ($expr instanceof Node\Expr\Assign) {
if (!$scope instanceof MutatingScope) {
throw new ShouldNotHappenException();
}
if ($context->null()) {
$specifiedTypes = $this->specifyTypesInCondition($scope->exitFirstLevelStatements(), $expr->expr, $context)->setRootExpr($expr);
// infer $arr[$key] after $key = array_key_first/last($arr)
if (
$expr->expr instanceof FuncCall
&& $expr->expr->name instanceof Name
&& in_array($expr->expr->name->toLowerString(), ['array_key_first', 'array_key_last'], true)
&& count($expr->expr->getArgs()) >= 1
) {
$arrayArg = $expr->expr->getArgs()[0]->value;
$arrayType = $scope->getType($arrayArg);
if (
$arrayType->isArray()->yes()
&& $arrayType->isIterableAtLeastOnce()->yes()
) {
$dimFetch = new ArrayDimFetch($arrayArg, $expr->var);
$iterableValueType = $expr->expr->name->toLowerString() === 'array_key_first'
? $arrayType->getFirstIterableValueType()
: $arrayType->getLastIterableValueType();
return $specifiedTypes->unionWith(
$this->create($dimFetch, $iterableValueType, TypeSpecifierContext::createTrue(), $scope),
);
}
}
// infer $list[$count] after $count = count($list) - 1
if (
$expr->expr instanceof Expr\BinaryOp\Minus
&& $expr->expr->left instanceof FuncCall
&& $expr->expr->left->name instanceof Name
&& in_array($expr->expr->left->name->toLowerString(), ['count', 'sizeof'], true)
&& count($expr->expr->left->getArgs()) >= 1
&& $expr->expr->right instanceof Node\Scalar\Int_
&& $expr->expr->right->value === 1
) {
$arrayArg = $expr->expr->left->getArgs()[0]->value;
$arrayType = $scope->getType($arrayArg);
if (
$arrayType->isList()->yes()
&& $arrayType->isIterableAtLeastOnce()->yes()
) {
$dimFetch = new ArrayDimFetch($arrayArg, $expr->var);
return $specifiedTypes->unionWith(
$this->create($dimFetch, $arrayType->getLastIterableValueType(), TypeSpecifierContext::createTrue(), $scope),
);
}
}
return $specifiedTypes;
}
$specifiedTypes = $this->specifyTypesInCondition($scope->exitFirstLevelStatements(), $expr->var, $context)->setRootExpr($expr);
if ($context->true()) {
// infer $arr[$key] after $key = array_search($needle, $arr)
if (
$expr->expr instanceof FuncCall
&& $expr->expr->name instanceof Name
&& $expr->expr->name->toLowerString() === 'array_search'
&& count($expr->expr->getArgs()) >= 2
) {
$arrayArg = $expr->expr->getArgs()[1]->value;
$arrayType = $scope->getType($arrayArg);
if ($arrayType->isArray()->yes()) {
$dimFetch = new ArrayDimFetch($arrayArg, $expr->var);
$iterableValueType = $arrayType->getIterableValueType();
return $specifiedTypes->unionWith(
$this->create($dimFetch, $iterableValueType, TypeSpecifierContext::createTrue(), $scope),
);
}
}
}
return $specifiedTypes;
} elseif (
$expr instanceof Expr\Isset_
&& count($expr->vars) > 0
&& !$context->null()
) {
// rewrite multi param isset() to and-chained single param isset()
if (count($expr->vars) > 1) {
$issets = [];
foreach ($expr->vars as $var) {
$issets[] = new Expr\Isset_([$var], $expr->getAttributes());
}
$first = array_shift($issets);
$andChain = null;
foreach ($issets as $isset) {
if ($andChain === null) {
$andChain = new BooleanAnd($first, $isset);
continue;
}
$andChain = new BooleanAnd($andChain, $isset);
}
if ($andChain === null) {
throw new ShouldNotHappenException();
}
return $this->specifyTypesInCondition($scope, $andChain, $context)->setRootExpr($expr);
}
$issetExpr = $expr->vars[0];
if (!$context->true()) {
if (!$scope instanceof MutatingScope) {
throw new ShouldNotHappenException();
}
$isset = $scope->issetCheck($issetExpr, static fn () => true);
if ($isset === false) {
return new SpecifiedTypes();
}
$type = $scope->getType($issetExpr);
$isNullable = !$type->isNull()->no();
$exprType = $this->create(
$issetExpr,
new NullType(),
$context->negate(),
$scope,
)->setRootExpr($expr);
if ($issetExpr instanceof Expr\Variable && is_string($issetExpr->name)) {
if ($isset === true) {
if ($isNullable) {
return $exprType;
}
// variable cannot exist in !isset()
return $exprType->unionWith($this->create(
new IssetExpr($issetExpr),
new NullType(),
$context,
$scope,
))->setRootExpr($expr);
}
if ($isNullable) {
// reduces variable certainty to maybe
return $exprType->unionWith($this->create(
new IssetExpr($issetExpr),
new NullType(),
$context->negate(),
$scope,
))->setRootExpr($expr);
}
// variable cannot exist in !isset()
return $this->create(
new IssetExpr($issetExpr),
new NullType(),
$context,
$scope,
)->setRootExpr($expr);
}
if ($isNullable && $isset === true) {
return $exprType;
}
return new SpecifiedTypes();
}
$tmpVars = [$issetExpr];
while (
$issetExpr instanceof ArrayDimFetch
|| $issetExpr instanceof PropertyFetch
|| (
$issetExpr instanceof StaticPropertyFetch
&& $issetExpr->class instanceof Expr
)
) {
if ($issetExpr instanceof StaticPropertyFetch) {
/** @var Expr $issetExpr */
$issetExpr = $issetExpr->class;
} else {
$issetExpr = $issetExpr->var;
}
$tmpVars[] = $issetExpr;
}
$vars = array_reverse($tmpVars);
$types = new SpecifiedTypes();
foreach ($vars as $var) {
if ($var instanceof Expr\Variable && is_string($var->name)) {
if ($scope->hasVariableType($var->name)->no()) {
return (new SpecifiedTypes([], []))->setRootExpr($expr);
}
}
if (
$var instanceof ArrayDimFetch
&& $var->dim !== null
&& !$scope->getType($var->var) instanceof MixedType
) {
$dimType = $scope->getType($var->dim);
if ($dimType instanceof ConstantIntegerType || $dimType instanceof ConstantStringType) {
$types = $types->unionWith(
$this->create(
$var->var,
new HasOffsetType($dimType),
$context,
$scope,
)->setRootExpr($expr),
);
} else {
$varType = $scope->getType($var->var);
$narrowedKey = AllowedArrayKeysTypes::narrowOffsetKeyType($varType, $dimType);
if ($narrowedKey !== null) {
$types = $types->unionWith(
$this->create(
$var->dim,
$narrowedKey,
$context,
$scope,
)->setRootExpr($expr),
);
}
}
}
if (
$var instanceof PropertyFetch
&& $var->name instanceof Node\Identifier
) {
$types = $types->unionWith(
$this->create($var->var, new IntersectionType([
new ObjectWithoutClassType(),
new HasPropertyType($var->name->toString()),
]), TypeSpecifierContext::createTruthy(), $scope)->setRootExpr($expr),
);
} elseif (
$var instanceof StaticPropertyFetch
&& $var->class instanceof Expr
&& $var->name instanceof Node\VarLikeIdentifier
) {
$types = $types->unionWith(
$this->create($var->class, new IntersectionType([
new ObjectWithoutClassType(),
new HasPropertyType($var->name->toString()),
]), TypeSpecifierContext::createTruthy(), $scope)->setRootExpr($expr),
);
}
$types = $types->unionWith(
$this->create($var, new NullType(), TypeSpecifierContext::createFalse(), $scope)->setRootExpr($expr),
);
}
return $types;
} elseif (
$expr instanceof Expr\BinaryOp\Coalesce
&& !$context->null()
) {
if (!$context->true()) {
if (!$scope instanceof MutatingScope) {
throw new ShouldNotHappenException();
}
$isset = $scope->issetCheck($expr->left, static fn () => true);
if ($isset !== true) {
return new SpecifiedTypes();
}
return $this->create(
$expr->left,
new NullType(),
$context->negate(),
$scope,
)->setRootExpr($expr);
}
if ((new ConstantBooleanType(false))->isSuperTypeOf($scope->getType($expr->right)->toBoolean())->yes()) {
return $this->create(
$expr->left,
new NullType(),
TypeSpecifierContext::createFalse(),
$scope,
)->setRootExpr($expr);
}
} elseif (
$expr instanceof Expr\Empty_
) {
if (!$scope instanceof MutatingScope) {
throw new ShouldNotHappenException();
}
$isset = $scope->issetCheck($expr->expr, static fn () => true);
if ($isset === false) {
return new SpecifiedTypes();
}
return $this->specifyTypesInCondition($scope, new BooleanOr(
new Expr\BooleanNot(new Expr\Isset_([$expr->expr])),
new Expr\BooleanNot($expr->expr),
), $context)->setRootExpr($expr);
} elseif ($expr instanceof Expr\ErrorSuppress) {
return $this->specifyTypesInCondition($scope, $expr->expr, $context)->setRootExpr($expr);
} elseif (
$expr instanceof Expr\Ternary
&& !$context->null()
&& $scope->getType($expr->else)->isFalse()->yes()
) {
$conditionExpr = $expr->cond;