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TypeCombinator.php
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TypeCombinator.php
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<?php declare(strict_types = 1);
namespace PHPStan\Type;
use PHPStan\Type\Accessory\AccessoryArrayListType;
use PHPStan\Type\Accessory\AccessoryNonEmptyStringType;
use PHPStan\Type\Accessory\AccessoryType;
use PHPStan\Type\Accessory\HasOffsetType;
use PHPStan\Type\Accessory\HasOffsetValueType;
use PHPStan\Type\Accessory\HasPropertyType;
use PHPStan\Type\Accessory\NonEmptyArrayType;
use PHPStan\Type\Accessory\OversizedArrayType;
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\Generic\GenericClassStringType;
use PHPStan\Type\Generic\TemplateArrayType;
use PHPStan\Type\Generic\TemplateBenevolentUnionType;
use PHPStan\Type\Generic\TemplateType;
use PHPStan\Type\Generic\TemplateTypeFactory;
use PHPStan\Type\Generic\TemplateUnionType;
use function array_key_exists;
use function array_key_first;
use function array_map;
use function array_merge;
use function array_slice;
use function array_splice;
use function array_values;
use function count;
use function get_class;
use function is_int;
use function md5;
use function sprintf;
use function usort;
/** @api */
class TypeCombinator
{
public static function addNull(Type $type): Type
{
$nullType = new NullType();
if ($nullType->isSuperTypeOf($type)->no()) {
return self::union($type, $nullType);
}
return $type;
}
public static function remove(Type $fromType, Type $typeToRemove): Type
{
if ($typeToRemove instanceof UnionType) {
foreach ($typeToRemove->getTypes() as $unionTypeToRemove) {
$fromType = self::remove($fromType, $unionTypeToRemove);
}
return $fromType;
}
$isSuperType = $typeToRemove->isSuperTypeOf($fromType);
if ($isSuperType->yes()) {
return new NeverType();
}
if ($isSuperType->no()) {
return $fromType;
}
if ($typeToRemove instanceof MixedType) {
$typeToRemoveSubtractedType = $typeToRemove->getSubtractedType();
if ($typeToRemoveSubtractedType !== null) {
return self::intersect($fromType, $typeToRemoveSubtractedType);
}
}
$removed = $fromType->tryRemove($typeToRemove);
if ($removed !== null) {
return $removed;
}
$fromFiniteTypes = $fromType->getFiniteTypes();
if (count($fromFiniteTypes) > 0) {
$finiteTypesToRemove = $typeToRemove->getFiniteTypes();
if (count($finiteTypesToRemove) === 1) {
$result = [];
foreach ($fromFiniteTypes as $finiteType) {
if ($finiteType->equals($finiteTypesToRemove[0])) {
continue;
}
$result[] = $finiteType;
}
if (count($result) === count($fromFiniteTypes)) {
return $fromType;
}
if (count($result) === 0) {
return new NeverType();
}
if (count($result) === 1) {
return $result[0];
}
return new UnionType($result);
}
}
return $fromType;
}
public static function removeNull(Type $type): Type
{
if (self::containsNull($type)) {
return self::remove($type, new NullType());
}
return $type;
}
public static function containsNull(Type $type): bool
{
if ($type instanceof UnionType) {
foreach ($type->getTypes() as $innerType) {
if ($innerType instanceof NullType) {
return true;
}
}
return false;
}
return $type instanceof NullType;
}
public static function union(Type ...$types): Type
{
$typesCount = count($types);
if ($typesCount === 0) {
return new NeverType();
}
$benevolentTypes = [];
$benevolentUnionObject = null;
// transform A | (B | C) to A | B | C
for ($i = 0; $i < $typesCount; $i++) {
if ($types[$i] instanceof BenevolentUnionType) {
if ($types[$i] instanceof TemplateBenevolentUnionType && $benevolentUnionObject === null) {
$benevolentUnionObject = $types[$i];
}
$benevolentTypesCount = 0;
$typesInner = $types[$i]->getTypes();
foreach ($typesInner as $benevolentInnerType) {
$benevolentTypesCount++;
$benevolentTypes[$benevolentInnerType->describe(VerbosityLevel::value())] = $benevolentInnerType;
}
array_splice($types, $i, 1, $typesInner);
$typesCount += $benevolentTypesCount - 1;
continue;
}
if (!($types[$i] instanceof UnionType)) {
continue;
}
if ($types[$i] instanceof TemplateType) {
continue;
}
$typesInner = $types[$i]->getTypes();
array_splice($types, $i, 1, $typesInner);
$typesCount += count($typesInner) - 1;
}
if ($typesCount === 1) {
return $types[0];
}
$arrayTypes = [];
$scalarTypes = [];
$hasGenericScalarTypes = [];
$enumCaseTypes = [];
for ($i = 0; $i < $typesCount; $i++) {
if ($types[$i] instanceof ConstantScalarType) {
$type = $types[$i];
$scalarTypes[get_class($type)][md5($type->describe(VerbosityLevel::cache()))] = $type;
unset($types[$i]);
continue;
}
if ($types[$i] instanceof BooleanType) {
$hasGenericScalarTypes[ConstantBooleanType::class] = true;
}
if ($types[$i] instanceof FloatType) {
$hasGenericScalarTypes[ConstantFloatType::class] = true;
}
if ($types[$i] instanceof IntegerType && !$types[$i] instanceof IntegerRangeType) {
$hasGenericScalarTypes[ConstantIntegerType::class] = true;
}
if ($types[$i] instanceof StringType && !$types[$i] instanceof ClassStringType) {
$hasGenericScalarTypes[ConstantStringType::class] = true;
}
$enumCases = $types[$i]->getEnumCases();
if (count($enumCases) === 1) {
$enumCaseTypes[$types[$i]->describe(VerbosityLevel::cache())] = $types[$i];
unset($types[$i]);
continue;
}
if (!$types[$i]->isArray()->yes()) {
continue;
}
$arrayTypes[] = $types[$i];
unset($types[$i]);
}
foreach ($scalarTypes as $classType => $scalarTypeItems) {
$scalarTypes[$classType] = array_values($scalarTypeItems);
}
$enumCaseTypes = array_values($enumCaseTypes);
$types = array_values($types);
$typesCount = count($types);
foreach ($scalarTypes as $classType => $scalarTypeItems) {
if (isset($hasGenericScalarTypes[$classType])) {
unset($scalarTypes[$classType]);
continue;
}
if ($classType === ConstantBooleanType::class && count($scalarTypeItems) === 2) {
$types[] = new BooleanType();
$typesCount++;
unset($scalarTypes[$classType]);
continue;
}
$scalarTypeItemsCount = count($scalarTypeItems);
for ($i = 0; $i < $typesCount; $i++) {
for ($j = 0; $j < $scalarTypeItemsCount; $j++) {
$compareResult = self::compareTypesInUnion($types[$i], $scalarTypeItems[$j]);
if ($compareResult === null) {
continue;
}
[$a, $b] = $compareResult;
if ($a !== null) {
$types[$i] = $a;
array_splice($scalarTypeItems, $j--, 1);
$scalarTypeItemsCount--;
continue 1;
}
if ($b !== null) {
$scalarTypeItems[$j] = $b;
array_splice($types, $i--, 1);
$typesCount--;
continue 2;
}
}
}
$scalarTypes[$classType] = $scalarTypeItems;
}
if (count($types) > 16) {
$newTypes = [];
foreach ($types as $type) {
$newTypes[$type->describe(VerbosityLevel::cache())] = $type;
}
$types = array_values($newTypes);
}
$types = array_merge(
$types,
self::processArrayTypes($arrayTypes),
);
$typesCount = count($types);
// transform A | A to A
// transform A | never to A
for ($i = 0; $i < $typesCount; $i++) {
for ($j = $i + 1; $j < $typesCount; $j++) {
$compareResult = self::compareTypesInUnion($types[$i], $types[$j]);
if ($compareResult === null) {
continue;
}
[$a, $b] = $compareResult;
if ($a !== null) {
$types[$i] = $a;
array_splice($types, $j--, 1);
$typesCount--;
continue 1;
}
if ($b !== null) {
$types[$j] = $b;
array_splice($types, $i--, 1);
$typesCount--;
continue 2;
}
}
}
$enumCasesCount = count($enumCaseTypes);
for ($i = 0; $i < $typesCount; $i++) {
for ($j = 0; $j < $enumCasesCount; $j++) {
$compareResult = self::compareTypesInUnion($types[$i], $enumCaseTypes[$j]);
if ($compareResult === null) {
continue;
}
[$a, $b] = $compareResult;
if ($a !== null) {
$types[$i] = $a;
array_splice($enumCaseTypes, $j--, 1);
$enumCasesCount--;
continue 1;
}
if ($b !== null) {
$enumCaseTypes[$j] = $b;
array_splice($types, $i--, 1);
$typesCount--;
continue 2;
}
}
}
foreach ($enumCaseTypes as $enumCaseType) {
$types[] = $enumCaseType;
$typesCount++;
}
foreach ($scalarTypes as $scalarTypeItems) {
foreach ($scalarTypeItems as $scalarType) {
$types[] = $scalarType;
$typesCount++;
}
}
if ($typesCount === 0) {
return new NeverType();
}
if ($typesCount === 1) {
return $types[0];
}
if ($benevolentTypes !== []) {
$tempTypes = $types;
foreach ($tempTypes as $i => $type) {
if (!isset($benevolentTypes[$type->describe(VerbosityLevel::value())])) {
break;
}
unset($tempTypes[$i]);
}
if ($tempTypes === []) {
if ($benevolentUnionObject instanceof TemplateBenevolentUnionType) {
return $benevolentUnionObject->withTypes($types);
}
return new BenevolentUnionType($types);
}
}
return new UnionType($types, true);
}
/**
* @return array{Type, null}|array{null, Type}|null
*/
private static function compareTypesInUnion(Type $a, Type $b): ?array
{
if ($a instanceof IntegerRangeType) {
$type = $a->tryUnion($b);
if ($type !== null) {
$a = $type;
return [$a, null];
}
}
if ($b instanceof IntegerRangeType) {
$type = $b->tryUnion($a);
if ($type !== null) {
$b = $type;
return [null, $b];
}
}
if ($a instanceof IntegerRangeType && $b instanceof IntegerRangeType) {
return null;
}
if ($a instanceof HasOffsetValueType && $b instanceof HasOffsetValueType) {
if ($a->getOffsetType()->equals($b->getOffsetType())) {
return [new HasOffsetValueType($a->getOffsetType(), self::union($a->getValueType(), $b->getValueType())), null];
}
}
if ($a->isConstantArray()->yes() && $b->isConstantArray()->yes()) {
return null;
}
// simplify string[] | int[] to (string|int)[]
if ($a instanceof IterableType && $b instanceof IterableType) {
return [
new IterableType(
self::union($a->getIterableKeyType(), $b->getIterableKeyType()),
self::union($a->getIterableValueType(), $b->getIterableValueType()),
),
null,
];
}
if ($a instanceof SubtractableType) {
$typeWithoutSubtractedTypeA = $a->getTypeWithoutSubtractedType();
if ($typeWithoutSubtractedTypeA instanceof MixedType && $b instanceof MixedType) {
$isSuperType = $typeWithoutSubtractedTypeA->isSuperTypeOfMixed($b);
} else {
$isSuperType = $typeWithoutSubtractedTypeA->isSuperTypeOf($b);
}
if ($isSuperType->yes()) {
$a = self::intersectWithSubtractedType($a, $b);
return [$a, null];
}
}
if ($b instanceof SubtractableType) {
$typeWithoutSubtractedTypeB = $b->getTypeWithoutSubtractedType();
if ($typeWithoutSubtractedTypeB instanceof MixedType && $a instanceof MixedType) {
$isSuperType = $typeWithoutSubtractedTypeB->isSuperTypeOfMixed($a);
} else {
$isSuperType = $typeWithoutSubtractedTypeB->isSuperTypeOf($a);
}
if ($isSuperType->yes()) {
$b = self::intersectWithSubtractedType($b, $a);
return [null, $b];
}
}
if ($b->isSuperTypeOf($a)->yes()) {
return [null, $b];
}
if ($a->isSuperTypeOf($b)->yes()) {
return [$a, null];
}
if (
$a instanceof ConstantStringType
&& $a->getValue() === ''
&& ($b->describe(VerbosityLevel::value()) === 'non-empty-string'
|| $b->describe(VerbosityLevel::value()) === 'non-falsy-string')
) {
return [null, new StringType()];
}
if (
$b instanceof ConstantStringType
&& $b->getValue() === ''
&& ($a->describe(VerbosityLevel::value()) === 'non-empty-string'
|| $a->describe(VerbosityLevel::value()) === 'non-falsy-string')
) {
return [new StringType(), null];
}
if (
$a instanceof ConstantStringType
&& $a->getValue() === '0'
&& $b->describe(VerbosityLevel::value()) === 'non-falsy-string'
) {
return [null, new IntersectionType([
new StringType(),
new AccessoryNonEmptyStringType(),
])];
}
if (
$b instanceof ConstantStringType
&& $b->getValue() === '0'
&& $a->describe(VerbosityLevel::value()) === 'non-falsy-string'
) {
return [new IntersectionType([
new StringType(),
new AccessoryNonEmptyStringType(),
]), null];
}
return null;
}
private static function unionWithSubtractedType(
Type $type,
?Type $subtractedType,
): Type
{
if ($subtractedType === null) {
return $type;
}
if ($type instanceof SubtractableType) {
$subtractedType = $type->getSubtractedType() === null
? $subtractedType
: self::union($type->getSubtractedType(), $subtractedType);
if ($subtractedType instanceof NeverType) {
$subtractedType = null;
}
return $type->changeSubtractedType($subtractedType);
}
if ($subtractedType->isSuperTypeOf($type)->yes()) {
return new NeverType();
}
return self::remove($type, $subtractedType);
}
private static function intersectWithSubtractedType(
SubtractableType $a,
Type $b,
): Type
{
if ($a->getSubtractedType() === null) {
return $a;
}
if ($b instanceof IntersectionType) {
$subtractableTypes = [];
foreach ($b->getTypes() as $innerType) {
if (!$innerType instanceof SubtractableType) {
continue;
}
$subtractableTypes[] = $innerType;
}
if (count($subtractableTypes) === 0) {
return $a->getTypeWithoutSubtractedType();
}
$subtractedTypes = [];
foreach ($subtractableTypes as $subtractableType) {
if ($subtractableType->getSubtractedType() === null) {
continue;
}
$subtractedTypes[] = $subtractableType->getSubtractedType();
}
if (count($subtractedTypes) === 0) {
return $a->getTypeWithoutSubtractedType();
}
$subtractedType = self::union(...$subtractedTypes);
} elseif ($b instanceof SubtractableType) {
$subtractedType = $b->getSubtractedType();
if ($subtractedType === null) {
return $a->getTypeWithoutSubtractedType();
}
} else {
$subtractedTypeTmp = self::intersect($a->getTypeWithoutSubtractedType(), $a->getSubtractedType());
if ($b->isSuperTypeOf($subtractedTypeTmp)->yes()) {
return $a->getTypeWithoutSubtractedType();
}
$subtractedType = new MixedType(false, $b);
}
$subtractedType = self::intersect(
$a->getSubtractedType(),
$subtractedType,
);
if ($subtractedType instanceof NeverType) {
$subtractedType = null;
}
return $a->changeSubtractedType($subtractedType);
}
/**
* @param Type[] $arrayTypes
* @return Type[]
*/
private static function processArrayAccessoryTypes(array $arrayTypes): array
{
$accessoryTypes = [];
foreach ($arrayTypes as $i => $arrayType) {
if ($arrayType instanceof IntersectionType) {
foreach ($arrayType->getTypes() as $innerType) {
if ($innerType instanceof TemplateType) {
break;
}
if (!($innerType instanceof AccessoryType) && !($innerType instanceof CallableType)) {
continue;
}
if ($innerType instanceof HasOffsetValueType) {
$accessoryTypes[sprintf('hasOffsetValue(%s)', $innerType->getOffsetType()->describe(VerbosityLevel::cache()))][$i] = $innerType;
continue;
}
$accessoryTypes[$innerType->describe(VerbosityLevel::cache())][$i] = $innerType;
}
}
if (!$arrayType->isConstantArray()->yes()) {
continue;
}
$constantArrays = $arrayType->getConstantArrays();
foreach ($constantArrays as $constantArray) {
if ($constantArray->isList()->yes() && AccessoryArrayListType::isListTypeEnabled()) {
$list = new AccessoryArrayListType();
$accessoryTypes[$list->describe(VerbosityLevel::cache())][$i] = $list;
}
if (!$constantArray->isIterableAtLeastOnce()->yes()) {
continue;
}
$nonEmpty = new NonEmptyArrayType();
$accessoryTypes[$nonEmpty->describe(VerbosityLevel::cache())][$i] = $nonEmpty;
}
}
$commonAccessoryTypes = [];
$arrayTypeCount = count($arrayTypes);
foreach ($accessoryTypes as $accessoryType) {
if (count($accessoryType) !== $arrayTypeCount) {
$firstKey = array_key_first($accessoryType);
if ($accessoryType[$firstKey] instanceof OversizedArrayType) {
$commonAccessoryTypes[] = $accessoryType[$firstKey];
}
continue;
}
if ($accessoryType[0] instanceof HasOffsetValueType) {
$commonAccessoryTypes[] = self::union(...$accessoryType);
continue;
}
$commonAccessoryTypes[] = $accessoryType[0];
}
return $commonAccessoryTypes;
}
/**
* @param Type[] $arrayTypes
* @return Type[]
*/
private static function processArrayTypes(array $arrayTypes): array
{
if ($arrayTypes === []) {
return [];
}
$accessoryTypes = self::processArrayAccessoryTypes($arrayTypes);
if (count($arrayTypes) === 1) {
return [
self::intersect(...$arrayTypes, ...$accessoryTypes),
];
}
$keyTypesForGeneralArray = [];
$valueTypesForGeneralArray = [];
$generalArrayOccurred = false;
$constantKeyTypesNumbered = [];
/** @var int|float $nextConstantKeyTypeIndex */
$nextConstantKeyTypeIndex = 1;
foreach ($arrayTypes as $arrayType) {
if ($generalArrayOccurred || !$arrayType->isConstantArray()->yes()) {
foreach ($arrayType->getArrays() as $type) {
$keyTypesForGeneralArray[] = $type->getKeyType();
$valueTypesForGeneralArray[] = $type->getItemType();
$generalArrayOccurred = true;
}
continue;
}
$constantArrays = $arrayType->getConstantArrays();
foreach ($constantArrays as $constantArray) {
foreach ($constantArray->getKeyTypes() as $i => $keyType) {
$keyTypesForGeneralArray[] = $keyType;
$valueTypesForGeneralArray[] = $constantArray->getValueTypes()[$i];
$keyTypeValue = $keyType->getValue();
if (array_key_exists($keyTypeValue, $constantKeyTypesNumbered)) {
continue;
}
$constantKeyTypesNumbered[$keyTypeValue] = $nextConstantKeyTypeIndex;
$nextConstantKeyTypeIndex *= 2;
if (!is_int($nextConstantKeyTypeIndex)) {
$generalArrayOccurred = true;
continue 2;
}
}
}
}
if ($generalArrayOccurred) {
$scopes = [];
$useTemplateArray = true;
foreach ($arrayTypes as $arrayType) {
if (!$arrayType instanceof TemplateArrayType) {
$useTemplateArray = false;
break;
}
$scopes[$arrayType->getScope()->describe()] = $arrayType;
}
$arrayType = new ArrayType(
self::union(...$keyTypesForGeneralArray),
self::union(...self::optimizeConstantArrays($valueTypesForGeneralArray)),
);
if ($useTemplateArray && count($scopes) === 1) {
$templateArray = array_values($scopes)[0];
$arrayType = new TemplateArrayType(
$templateArray->getScope(),
$templateArray->getStrategy(),
$templateArray->getVariance(),
$templateArray->getName(),
$arrayType,
);
}
return [
self::intersect($arrayType, ...$accessoryTypes),
];
}
$reducedArrayTypes = self::reduceArrays($arrayTypes);
return array_map(
static fn (Type $arrayType) => self::intersect($arrayType, ...$accessoryTypes),
self::optimizeConstantArrays($reducedArrayTypes),
);
}
/**
* @param Type[] $types
* @return Type[]
*/
private static function optimizeConstantArrays(array $types): array
{
$constantArrayValuesCount = self::countConstantArrayValueTypes($types);
if ($constantArrayValuesCount > ConstantArrayTypeBuilder::ARRAY_COUNT_LIMIT) {
$results = [];
foreach ($types as $type) {
$results[] = TypeTraverser::map($type, static function (Type $type, callable $traverse): Type {
if ($type instanceof ConstantArrayType) {
if ($type->isIterableAtLeastOnce()->no()) {
return $type;
}
$isList = true;
$valueTypes = [];
$keyTypes = [];
$nextAutoIndex = 0;
foreach ($type->getKeyTypes() as $i => $innerKeyType) {
if (!$innerKeyType instanceof ConstantIntegerType) {
$isList = false;
} elseif ($innerKeyType->getValue() !== $nextAutoIndex) {
$isList = false;
$nextAutoIndex = $innerKeyType->getValue() + 1;
} else {
$nextAutoIndex++;
}
$generalizedKeyType = $innerKeyType->generalize(GeneralizePrecision::moreSpecific());
$keyTypes[$generalizedKeyType->describe(VerbosityLevel::precise())] = $generalizedKeyType;
$innerValueType = $type->getValueTypes()[$i];
$generalizedValueType = TypeTraverser::map($innerValueType, static function (Type $type, callable $innerTraverse) use ($traverse): Type {
if ($type instanceof ArrayType) {
return TypeCombinator::intersect($type, new OversizedArrayType());
}
return $traverse($type);
});
$valueTypes[$generalizedValueType->describe(VerbosityLevel::precise())] = $generalizedValueType;
}
$keyType = TypeCombinator::union(...array_values($keyTypes));
$valueType = TypeCombinator::union(...array_values($valueTypes));
$arrayType = new ArrayType($keyType, $valueType);
if ($isList) {
$arrayType = AccessoryArrayListType::intersectWith($arrayType);
}
return TypeCombinator::intersect($arrayType, new NonEmptyArrayType(), new OversizedArrayType());
}
return $traverse($type);
});
}
return $results;
}
return $types;
}
/**
* @param Type[] $types
*/
private static function countConstantArrayValueTypes(array $types): int
{
$constantArrayValuesCount = 0;
foreach ($types as $type) {
TypeTraverser::map($type, static function (Type $type, callable $traverse) use (&$constantArrayValuesCount): Type {
if ($type instanceof ConstantArrayType) {
$constantArrayValuesCount += count($type->getValueTypes());
}
return $traverse($type);
});
}
return $constantArrayValuesCount;
}
/**
* @param Type[] $constantArrays
* @return Type[]
*/
private static function reduceArrays(array $constantArrays): array
{
$newArrays = [];
$arraysToProcess = [];
$emptyArray = null;
foreach ($constantArrays as $constantArray) {
if (!$constantArray->isConstantArray()->yes()) {
$newArrays[] = $constantArray;
continue;
}
if ($constantArray->isIterableAtLeastOnce()->no()) {
$emptyArray = $constantArray;
continue;
}
$arraysToProcess = array_merge($arraysToProcess, $constantArray->getConstantArrays());
}
if ($emptyArray !== null) {
$newArrays[] = $emptyArray;
}
$arraysToProcessPerKey = [];
foreach ($arraysToProcess as $i => $arrayToProcess) {
foreach ($arrayToProcess->getKeyTypes() as $keyType) {
$arraysToProcessPerKey[$keyType->getValue()][] = $i;
}
}
$eligibleCombinations = [];
foreach ($arraysToProcessPerKey as $arrays) {
for ($i = 0, $arraysCount = count($arrays); $i < $arraysCount - 1; $i++) {
for ($j = $i + 1; $j < $arraysCount; $j++) {
$eligibleCombinations[$arrays[$i]][$arrays[$j]] ??= 0;
$eligibleCombinations[$arrays[$i]][$arrays[$j]]++;
}
}
}
foreach ($eligibleCombinations as $i => $other) {
if (!array_key_exists($i, $arraysToProcess)) {
continue;
}
foreach ($other as $j => $overlappingKeysCount) {
if (!array_key_exists($j, $arraysToProcess)) {
continue;
}
if (
$overlappingKeysCount === count($arraysToProcess[$i]->getKeyTypes())
&& $arraysToProcess[$j]->isKeysSupersetOf($arraysToProcess[$i])
) {
$arraysToProcess[$j] = $arraysToProcess[$j]->mergeWith($arraysToProcess[$i]);
unset($arraysToProcess[$i]);
continue 2;
}
if (
$overlappingKeysCount === count($arraysToProcess[$j]->getKeyTypes())
&& $arraysToProcess[$i]->isKeysSupersetOf($arraysToProcess[$j])
) {
$arraysToProcess[$i] = $arraysToProcess[$i]->mergeWith($arraysToProcess[$j]);
unset($arraysToProcess[$j]);
continue 1;
}
}
}
return array_merge($newArrays, $arraysToProcess);
}
public static function intersect(Type ...$types): Type
{
$types = array_values($types);
$typesCount = count($types);
if ($typesCount === 0) {
return new NeverType();
}
if ($typesCount === 1) {
return $types[0];
}
$sortTypes = static function (Type $a, Type $b): int {
if (!$a instanceof UnionType || !$b instanceof UnionType) {
return 0;
}
if ($a instanceof TemplateType) {
return -1;
}
if ($b instanceof TemplateType) {
return 1;
}
if ($a instanceof BenevolentUnionType) {
return -1;
}
if ($b instanceof BenevolentUnionType) {
return 1;
}
return 0;
};
usort($types, $sortTypes);
// transform A & (B | C) to (A & B) | (A & C)
foreach ($types as $i => $type) {
if (!$type instanceof UnionType) {
continue;
}
$topLevelUnionSubTypes = [];
$innerTypes = $type->getTypes();
usort($innerTypes, $sortTypes);
$slice1 = array_slice($types, 0, $i);
$slice2 = array_slice($types, $i + 1);
foreach ($innerTypes as $innerUnionSubType) {
$topLevelUnionSubTypes[] = self::intersect(
$innerUnionSubType,
...$slice1,
...$slice2,
);
}
$union = self::union(...$topLevelUnionSubTypes);
if ($union instanceof NeverType) {
return $union;
}
if ($type instanceof BenevolentUnionType) {
$union = TypeUtils::toBenevolentUnion($union);
}
if ($type instanceof TemplateUnionType || $type instanceof TemplateBenevolentUnionType) {
$union = TemplateTypeFactory::create(
$type->getScope(),
$type->getName(),
$union,
$type->getVariance(),
$type->getStrategy(),
);
}
return $union;
}
$typesCount = count($types);
// transform A & (B & C) to A & B & C
for ($i = 0; $i < $typesCount; $i++) {
$type = $types[$i];
if (!($type instanceof IntersectionType)) {
continue;
}
array_splice($types, $i--, 1, $type->getTypes());
$typesCount = count($types);
}
$hasOffsetValueTypeCount = 0;
$newTypes = [];
foreach ($types as $type) {
if (!$type instanceof HasOffsetValueType) {
$newTypes[] = $type;
continue;
}