This crates is about parsing Cairo types from an ABI. Later, this will also be able to parse Cairo type from Cairo code.
The important consideration are the generic type. Indeed, in the ABI there is no information about a type genericity and how exactly the members/variants are following the generic type as everything is flattened.
abi_types is the low level parsing of the types. It supports
nested types.
CairoStruct, CairoEnum and CairoFunction are higher level
types to resolve the genericity and manage members/variants/inputs/outputs
for simpler expansion.