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153 lines (116 loc) · 4.36 KB
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<?php declare(strict_types = 1);
namespace PHPStan\Type;
use PHPStan\Analyser\NameScope;
use PHPStan\PhpDoc\TypeNodeResolver;
use PHPStan\PhpDoc\TypeStringResolver;
use PHPStan\Reflection\ReflectionProvider;
use PHPStan\ShouldNotHappenException;
use function array_key_exists;
use function sprintf;
class UsefulTypeAliasResolver implements TypeAliasResolver
{
/** @var array<string, Type> */
private array $resolvedGlobalTypeAliases = [];
/** @var array<string, Type> */
private array $resolvedLocalTypeAliases = [];
/** @var array<string, true> */
private array $resolvingClassTypeAliases = [];
/** @var array<string, true> */
private array $inProcess = [];
/**
* @param array<string, string> $globalTypeAliases
*/
public function __construct(
private array $globalTypeAliases,
private TypeStringResolver $typeStringResolver,
private TypeNodeResolver $typeNodeResolver,
private ReflectionProvider $reflectionProvider,
)
{
}
public function hasTypeAlias(string $aliasName, ?string $classNameScope): bool
{
$hasGlobalTypeAlias = array_key_exists($aliasName, $this->globalTypeAliases);
if ($hasGlobalTypeAlias) {
return true;
}
if ($classNameScope === null || !$this->reflectionProvider->hasClass($classNameScope)) {
return false;
}
$classReflection = $this->reflectionProvider->getClass($classNameScope);
$localTypeAliases = $classReflection->getTypeAliases();
return array_key_exists($aliasName, $localTypeAliases);
}
public function resolveTypeAlias(string $aliasName, NameScope $nameScope): ?Type
{
return $this->resolveLocalTypeAlias($aliasName, $nameScope)
?? $this->resolveGlobalTypeAlias($aliasName, $nameScope);
}
private function resolveLocalTypeAlias(string $aliasName, NameScope $nameScope): ?Type
{
if (array_key_exists($aliasName, $this->globalTypeAliases)) {
return null;
}
if (!$nameScope->hasTypeAlias($aliasName)) {
return null;
}
$className = $nameScope->getClassName();
if ($className === null) {
return null;
}
$aliasNameInClassScope = $className . '::' . $aliasName;
if (array_key_exists($aliasNameInClassScope, $this->resolvedLocalTypeAliases)) {
return $this->resolvedLocalTypeAliases[$aliasNameInClassScope];
}
// prevent infinite recursion
if (array_key_exists($className, $this->resolvingClassTypeAliases)) {
return null;
}
$this->resolvingClassTypeAliases[$className] = true;
if (!$this->reflectionProvider->hasClass($className)) {
unset($this->resolvingClassTypeAliases[$className]);
return null;
}
$classReflection = $this->reflectionProvider->getClass($className);
$localTypeAliases = $classReflection->getTypeAliases();
unset($this->resolvingClassTypeAliases[$className]);
if (!array_key_exists($aliasName, $localTypeAliases)) {
return null;
}
if (array_key_exists($aliasNameInClassScope, $this->inProcess)) {
// resolve circular reference as ErrorType to make it easier to detect
throw new CircularTypeAliasDefinitionException();
}
$this->inProcess[$aliasNameInClassScope] = true;
try {
$unresolvedAlias = $localTypeAliases[$aliasName];
$resolvedAliasType = $unresolvedAlias->resolve($this->typeNodeResolver);
} catch (CircularTypeAliasDefinitionException) {
$resolvedAliasType = new CircularTypeAliasErrorType();
}
$this->resolvedLocalTypeAliases[$aliasNameInClassScope] = $resolvedAliasType;
unset($this->inProcess[$aliasNameInClassScope]);
return $resolvedAliasType;
}
private function resolveGlobalTypeAlias(string $aliasName, NameScope $nameScope): ?Type
{
if (!array_key_exists($aliasName, $this->globalTypeAliases)) {
return null;
}
if (array_key_exists($aliasName, $this->resolvedGlobalTypeAliases)) {
return $this->resolvedGlobalTypeAliases[$aliasName];
}
if ($this->reflectionProvider->hasClass($nameScope->resolveStringName($aliasName))) {
throw new ShouldNotHappenException(sprintf('Type alias %s already exists as a class.', $aliasName));
}
if (array_key_exists($aliasName, $this->inProcess)) {
throw new ShouldNotHappenException(sprintf('Circular definition for type alias %s.', $aliasName));
}
$this->inProcess[$aliasName] = true;
$aliasTypeString = $this->globalTypeAliases[$aliasName];
$aliasType = $this->typeStringResolver->resolve($aliasTypeString);
$this->resolvedGlobalTypeAliases[$aliasName] = $aliasType;
unset($this->inProcess[$aliasName]);
return $aliasType;
}
}