ModulePath returns the module declaration of a go.mod file "b" contents.

Package returns the package declaration (without "package") of "b" source-code contents.

Parse accepts a source and returns a `Result`.

TryFindPackage returns a go package based on the dir, it reads the package declaration of the `main.go` or any `*go`.

AssetDir represents the parsed asset directories that are handled by Iris.

Result is the `Parse` return value.