/usr/lib/ocaml/atdgen/ag_mapping.ml is in libatdgen-ocaml-dev 1.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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open Ag_error
type loc = Atd_ast.loc
let annot_error loc =
Ag_error.error loc "Invalid annotation"
type loc_id = string
(*
Generic mapping, based on the core ATD types
*)
type ('a, 'b) mapping =
[ `Unit of (loc * 'a * 'b)
| `Bool of (loc * 'a * 'b)
| `Int of (loc * 'a * 'b)
| `Float of (loc * 'a * 'b)
| `String of (loc * 'a * 'b)
| `Sum of (loc * ('a, 'b) variant_mapping array * 'a * 'b)
| `Record of (loc * ('a, 'b) field_mapping array * 'a * 'b)
| `Tuple of (loc * ('a, 'b) cell_mapping array * 'a * 'b)
| `List of (loc * ('a, 'b) mapping * 'a * 'b)
| `Option of (loc * ('a, 'b) mapping * 'a * 'b)
| `Nullable of (loc * ('a, 'b) mapping * 'a * 'b)
| `Shared of (loc * loc_id * ('a, 'b) mapping * 'a * 'b)
| `Wrap of (loc * ('a, 'b) mapping * 'a * 'b)
| `Name of (loc * string * ('a, 'b) mapping list * 'a option * 'b option)
| `External of (loc * string * ('a, 'b) mapping list * 'a * 'b)
| `Tvar of (loc * string) ]
and ('a, 'b) cell_mapping = {
cel_loc : loc;
cel_value : ('a, 'b) mapping;
cel_arepr : 'a;
cel_brepr : 'b
}
and ('a, 'b) field_mapping = {
f_loc : loc;
f_name : string;
f_kind : Atd_ast.field_kind;
f_value : ('a, 'b) mapping;
f_arepr : 'a;
f_brepr : 'b
}
and ('a, 'b) variant_mapping = {
var_loc : loc;
var_cons : string;
var_arg : ('a, 'b) mapping option;
var_arepr : 'a;
var_brepr : 'b
}
type ('a, 'b) def = {
def_loc : loc;
def_name : string;
def_param : string list;
def_value : ('a, 'b) mapping option;
def_arepr : 'a;
def_brepr : 'b;
}
let as_abstract = function
`Name (_, (loc, "abstract", l), a) ->
if l <> [] then
error loc "\"abstract\" takes no type parameters";
Some (loc, a)
| _ ->
None
let is_abstract x = as_abstract x <> None
let loc_of_mapping x =
match (x : (_, _) mapping) with
`Unit (loc, _, _)
| `Bool (loc, _, _)
| `Int (loc, _, _)
| `Float (loc, _, _)
| `String (loc, _, _)
| `Sum (loc, _, _, _)
| `Record (loc, _, _, _)
| `Tuple (loc, _, _, _)
| `List (loc, _, _, _)
| `Option (loc, _, _, _)
| `Nullable (loc, _, _, _)
| `Shared (loc, _, _, _, _)
| `Wrap (loc, _, _, _)
| `Name (loc, _, _, _, _)
| `External (loc, _, _, _, _)
| `Tvar (loc, _) -> loc
module Env = Map.Make (String)
let rec subst env (x : (_, _) mapping) =
match x with
`Unit (loc, _, _)
| `Bool (loc, _, _)
| `Int (loc, _, _)
| `Float (loc, _, _)
| `String (loc, _, _) -> x
| `Sum (loc, ar, a, b) ->
`Sum (loc, Array.map (subst_variant env) ar, a, b)
| `Record (loc, ar, a, b) ->
`Record (loc, Array.map (subst_field env) ar, a, b)
| `Tuple (loc, ar, a, b) ->
`Tuple (loc, Array.map (subst_cell env) ar, a, b)
| `List (loc, x, a, b) ->
`List (loc, subst env x, a, b)
| `Option (loc, x, a, b) ->
`Option (loc, subst env x, a, b)
| `Nullable (loc, x, a, b) ->
`Nullable (loc, subst env x, a, b)
| `Shared (loc, id, x, a, b) ->
`Shared (loc, id, subst env x, a, b)
| `Wrap (loc, x, a, b) ->
`Wrap (loc, subst env x, a, b)
| `Name (loc, name, args, a, b) ->
`Name (loc, name, List.map (subst env) args, a, b)
| `External (loc, name, args, a, b) ->
`External (loc, name, List.map (subst env) args, a, b)
| `Tvar (loc, s) ->
try Env.find s env
with Not_found ->
invalid_arg (sprintf "Ag_mapping.subst_var: '%s" s)
and subst_variant env x =
match x.var_arg with
None -> x
| Some v -> { x with var_arg = Some (subst env v) }
and subst_field env x =
{ x with f_value = subst env x.f_value }
and subst_cell env x =
{ x with cel_value = subst env x.cel_value }
(*
Substitute type variables param in x by args
*)
let apply param x args =
if List.length param <> List.length args then
invalid_arg "Ag_mapping.apply";
let env =
List.fold_left2
(fun env var value -> Env.add var value env)
Env.empty param args
in
subst env x
let rec find_name loc env visited name =
if List.mem name visited then
error loc "Cyclic type definition"
else
let param, x = Env.find name env in
(param, deref_expr env (name :: visited) x)
and deref_expr env visited x =
match x with
`Name (loc, name, args, _, _) ->
(try
let param, x = find_name loc env visited name in
apply param x args
with Not_found -> x)
| _ -> x
let flatten l = List.flatten (List.map snd l)
let make_deref
(l : (bool * ('a, 'b) def list) list) :
(('a, 'b) mapping -> ('a, 'b) mapping) =
let defs =
List.fold_left
(fun env d ->
match d.def_value with
None -> env
| Some v -> Env.add d.def_name (d.def_param, v) env)
Env.empty (flatten l) in
fun x -> deref_expr defs [] x
|