A robust, self-contained utility that extracts the namespace and use-import statements from PHP source code using PHP's token_get_all. It implements a state machine that handles grouped use statements (e.g., use Foo\{Bar, Baz}), skips trait use and closure use, correctly handles string interpolations with curly braces, and normalizes namespace aliases. This component is isolated (only depends on PHP's tokenizer and ArrayIterator) and could be reused in any PHP static analysis tool to build a resolution context.

A base class for Compound (union) and Intersection types that provides automatic deduplication and flattening of nested aggregates. When adding a type, if the same type is already present or if the added type is itself an aggregate of the same kind, it flattens the hierarchy. This ensures that 'int|int' becomes just 'int' and 'A|(B|C)' becomes 'A|B|C'. The pattern is cleanly abstracted and reusable for any composite value-object system.

A focused resolver that transforms relative structural element names (e.g., 'Classy::method()') into fully qualified FQSENs using namespace context. It handles alias expansion and namespace prefixing in a few lines of clear, testable code. Though small, it demonstrates a clean separation of concerns and is a prime example of a single-responsibility resolver.