open Identifiers module Disambiguator = IdGen () (** See the comments for [Name] *) type path_elem = Ident of string | Disambiguator of Disambiguator.id [@@deriving show, ord] type name = path_elem list [@@deriving show, ord] (** A name such as: `std::collections::vector` (which would be represented as [[Ident "std"; Ident "collections"; Ident "vector"]]) A name really is a list of strings. However, we sometimes need to introduce unique indices to disambiguate. This mostly happens because of "impl" blocks in Rust: ``` impl List { ... } ``` A type in Rust can have several "impl" blocks, and those blocks can contain items with similar names. For this reason, we need to disambiguate them with unique indices. Rustc calls those "disambiguators". In rustc, this gives names like this: - `betree_main::betree::NodeIdCounter{impl#0}::new` - note that impl blocks can be nested, and macros sometimes generate weird names (which require disambiguation): `betree_main::betree_utils::_#1::{impl#0}::deserialize::{impl#0}` Finally, the paths used by rustc are a lot more precise and explicit than those we expose in LLBC: for instance, every identifier belongs to a specific namespace (value namespace, type namespace, etc.), and is coupled with a disambiguator. On our side, we want to stay high-level and simple: we use string identifiers as much as possible, insert disambiguators only when necessary (whenever we find an "impl" block, typically) and check that the disambiguator is useless in the other situations (i.e., the disambiguator is always equal to 0). Moreover, the items are uniquely disambiguated by their (integer) ids (`TypeDeclId.id`, etc.), and when extracting the code we have to deal with name clashes anyway. Still, we might want to be more precise in the future. Also note that the first path element in the name is always the crate name. *) let to_name (ls : string list) : name = List.map (fun s -> Ident s) ls type module_name = name [@@deriving show, ord] type type_name = name [@@deriving show, ord] type fun_name = name [@@deriving show, ord] (** Filter the disambiguators equal to 0 in a name *) let filter_disambiguators_zero (n : name) : name = let pred (pe : path_elem) : bool = match pe with Ident _ -> true | Disambiguator d -> d <> Disambiguator.zero in List.filter pred n let as_ident (pe : path_elem) : string = match pe with | Ident s -> s | Disambiguator _ -> raise (Failure "Improper variant")