package ocaml-in-python
Effortless Python bindings for OCaml modules
Install
Dune Dependency
Authors
Maintainers
Sources
ocaml-in-python-0.1.0.tar.gz
sha512=9ba2ad109ce83a758dd949fc40be8e866adb5aebf3b2009a04c4d93ea40f48ca71b8d6f8cd4e80a2bf52ca36fab6561f28e273d412cf8c235837063924f26eff
doc/src/ocaml-in-python.api/ocaml_in_python_api.ml.html
Source file ocaml_in_python_api.ml
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module ExtensibleArray = struct type 'a t = { mutable array : 'a array; mutable length : int; dummy : 'a; } let create dummy capacity = assert (capacity >= 1); { array = Array.make capacity dummy; length = 0; dummy; } let length ext = ext.length let get ext index = assert (index >= 0 && index < ext.length); ext.array.(index) let set ext index value = assert (index >= 0 && index < ext.length); ext.array.(index) <- value let push_f ext f = let index = ext.length in let new_length = succ index in ext.length <- new_length; let old_capacity = Array.length ext.array in let array = if new_length < old_capacity then ext.array else begin let new_capacity = old_capacity * 2 in let new_array = Array.make new_capacity ext.dummy in Array.blit ext.array 0 new_array 0 old_capacity; ext.array <- new_array; new_array end in array.(index) <- f index; index let push ext value = push_f ext (fun _ -> value) let to_list_map f ext = List.init ext.length (fun i -> f (get ext i)) end let rec hash_path seed (p : Path.t) = match p with | Pident ident -> Hashtbl.seeded_hash seed (0, Ident.hash ident) | Pdot (p, s) -> Hashtbl.seeded_hash seed (1, hash_path seed p, s) | Papply (p, q) -> Hashtbl.seeded_hash seed (2, hash_path seed p, hash_path seed q) let format_label (fmt : Format.formatter) (l : Ppxlib.arg_label) = match l with | Nolabel -> () | Labelled s -> Format.fprintf fmt "~%s:" s | Optional s -> Format.fprintf fmt "?%s:" s module Function = struct type t = | Implicit of Ppxlib.expression | Explicit of (Ppxlib.expression -> Ppxlib.expression) let apply (f : t) (e : Ppxlib.expression) = match f with | Implicit f -> [%expr [%e f] [%e e]] | Explicit f -> f e let to_expression (f : t) = match f with | Implicit f -> f | Explicit f -> [%expr fun v -> [%e f [%expr v]]] end type value_converter = { python_of_ocaml : Function.t; ocaml_of_python : Function.t; } type converters_of_arity = { python_args : Ppxlib.expression; python_dict : Ppxlib.expression; ocaml_pats : (Ppxlib.arg_label * Ppxlib.pattern) list; ocaml_exps : (Ppxlib.arg_label * Ppxlib.expression) list; } module Type = struct module Self = struct type t = | Any | Var of int | Arrow of param * t | Tuple of t list | Constr of Path.t * t list and param = { label : Ppxlib.arg_label; ty : t; } let rec hash seed t = match t with | Any -> Hashtbl.seeded_hash seed (-1) | Var x -> Hashtbl.seeded_hash seed (0, x) | Arrow ({ label; ty }, r) -> Hashtbl.seeded_hash seed (1, label, hash seed ty, hash seed r) | Tuple args -> Hashtbl.seeded_hash seed (2, List.map (hash seed) args) | Constr (p, args) -> Hashtbl.seeded_hash seed (3, hash_path seed p, List.map (hash seed) args) let rec equal t t' = match t, t' with | Any, Any -> true | Var x, Var y -> x = y | Arrow (p, r), Arrow (p', r') -> p.label = p'.label && equal p.ty p'.ty && equal r r' | Tuple args, Tuple args' -> List.equal equal args args' | Constr (p, args), Constr (p', args') -> Path.same p p' && List.equal equal args args' | _ -> false end include Self let rec subst f ty = match ty with | Any -> Any | Var index -> f index | Arrow ({ label; ty }, result) -> Arrow ({ label; ty = subst f ty }, subst f result) | Tuple list -> Tuple (List.map (subst f) list) | Constr (constr, args) -> Constr (constr, List.map (subst f) args) let map_param f param = { param with ty = f param.ty } type arity = { params : param list; result : t; } let map_arity f arity = { params = List.map (map_param f) arity.params; result = f arity.result; } let wrap, unwrap = Py.Capsule.make "ocaml.Type" let of_python (py_type : Py.Object.t) : t = let ocaml = Py.Import.import_module "ocaml" in if py_type = Py.Module.get (Py.Module.builtins ()) "object" then Any else if py_type = Py.Module.get ocaml "int" then Constr (Predef.path_int, []) else if py_type = Py.Module.get ocaml "float" then Constr (Predef.path_float, []) else if py_type = Py.Module.get ocaml "string" then Constr (Predef.path_string, []) else if py_type = Py.Module.get ocaml "bool" then Constr (Predef.path_bool, []) else unwrap ( Py.Callable.to_function_as_tuple (Py.Object.find_attr_string py_type "_get_type") (Py.Tuple.singleton py_type)) let rec arity_of_type (ty : t) : arity = match ty with | Arrow (param, result) -> let { params; result } = arity_of_type result in { params = param :: params; result } | _ -> { params = []; result = ty } let rec format (fmt : Format.formatter) (ty : t) = match ty with | Any -> Format.fprintf fmt "_" | Var i -> Format.fprintf fmt "'_%d" i | Arrow ({ label; ty }, r) -> Format.fprintf fmt "(%a%a -> %a)" format_label label format ty format r | Tuple args -> Format.fprintf fmt "(%a)" (Format.pp_print_list ~pp_sep:(fun fmt () -> Format.fprintf fmt " * ") format) args | Constr (p, []) -> Format.fprintf fmt "%a" Path.print p | Constr (p, args) -> Format.fprintf fmt "(%a) %a" (Format.pp_print_list ~pp_sep:(fun fmt () -> Format.fprintf fmt ", ") format) args Path.print p let to_string (ty : t) = Format.asprintf "%a" format ty let rec to_core_type (ty : t) : Ppxlib.Parsetree.core_type = match ty with | Any -> [%type: Py.Object.t] | Var _ -> assert false | Arrow ({ label; ty }, r) -> Ppxlib.Ast_helper.Typ.arrow label (to_core_type ty) (to_core_type r) | Tuple args -> Ppxlib.Ast_helper.Typ.tuple (List.map to_core_type args) | Constr (p, args) -> let p = Untypeast.lident_of_path p in let args = List.map to_core_type args in Ppxlib.Ast_helper.Typ.constr (Metapp.mkloc p) args module Hashtbl = Hashtbl.MakeSeeded (Self) let to_value_converter_ref = ref (fun ?(name : string option) (_ : Env.t) (_ : Path.t Path.Map.t) (_ : t) : value_converter -> ignore name; failwith "Not yet available to_value_converter") let to_value_converter ?name env expansions ty = !to_value_converter_ref ?name env expansions ty let converters_of_arity_ref = ref (fun (_ : Env.t) (_ : Path.t Path.Map.t) (_ : arity) : converters_of_arity -> failwith "Not yet available converters_of_arity") let converters_of_arity env expansions arity = !converters_of_arity_ref env expansions arity let value_converter_of_function_ref = ref (fun ?(name : string option) (_ : Env.t) (_ : Path.t Path.Map.t) (_ : arity) : value_converter -> ignore name; failwith "Not yet available value_converter_of_function") let value_converter_of_function ?name env expansions arity = !value_converter_of_function_ref ?name env expansions arity let types : t ExtensibleArray.t = ExtensibleArray.create Any 16 let type_table = Hashtbl.create 16 let to_index ty = try Hashtbl.find type_table ty with Not_found -> let index = ExtensibleArray.push types ty in Hashtbl.add type_table ty index; index let of_index index = ExtensibleArray.get types index end module TypeList = struct module Self = struct type t = Type.t list let hash seed l = Hashtbl.seeded_hash seed (List.map (Type.hash seed) l) let equal l l' = List.equal Type.equal l l' end include Self module Hashtbl = Hashtbl.MakeSeeded (Self) end module Paths = struct type path_cell = { path : Path.t; class_ : Py.Object.t; } type index_cell = { index : int; class_ : Py.Object.t; } let dummy = { path = Predef.path_int; class_ = Py.null } let store : path_cell ExtensibleArray.t = ExtensibleArray.create dummy 16 let converted_map_ref = ref Path.Map.empty let find_opt path = Path.Map.find_opt path !converted_map_ref let get index = ExtensibleArray.get store index let register path class_ = let converted_map = !converted_map_ref in let index = ExtensibleArray.push store { path; class_ } in converted_map_ref := Path.Map.add path { index; class_ } converted_map; index end type variable_index = { module_index : int; local_index : int; } let array_capsules : variable_index Type.Hashtbl.t = Type.Hashtbl.create 16 let array_api : Py.Object.t Type.Hashtbl.t = Type.Hashtbl.create 16 let list_capsules : variable_index Type.Hashtbl.t = Type.Hashtbl.create 16 let list_api : Py.Object.t Type.Hashtbl.t = Type.Hashtbl.create 16 let tuple_capsules : variable_index TypeList.Hashtbl.t = TypeList.Hashtbl.create 16 let tuple_api : Py.Object.t TypeList.Hashtbl.t = TypeList.Hashtbl.create 16 module IntHashtbl = Hashtbl.MakeSeeded (struct type t = int let equal = Int.equal let hash = Hashtbl.seeded_hash end) type 'a api = { api : 'a; make : Py.Object.t -> Py.Object.t; } type 'a type_def_info = { make_capsule : TypeList.t -> unit; make_api : TypeList.t -> unit; api_table : 'a api TypeList.Hashtbl.t; } let type_def_table : Py.Object.t type_def_info IntHashtbl.t = IntHashtbl.create 16 let api_for_type type_def_info tuple = let types = Py.Tuple.get tuple 0 in let type_list = try Py.List.to_list_map Type.of_python types with _ -> [Type.of_python types] in let api = try TypeList.Hashtbl.find type_def_info.api_table type_list with Not_found -> type_def_info.make_capsule type_list; type_def_info.make_api type_list; try TypeList.Hashtbl.find type_def_info.api_table type_list with Not_found -> failwith "api_for_type" in api.api let variant_table : Py.Object.t array type_def_info IntHashtbl.t = IntHashtbl.create 16 module OpenType = struct let table : Py.Object.t array type_def_info IntHashtbl.t = IntHashtbl.create 16 end let capsule_count = ref 0 let get_root_python_module () = Py.Import.import_module "ocaml" external fd_of_int : int -> Unix.file_descr = "%identity" external int_of_fd : Unix.file_descr -> int = "%identity" let py_of_char c = Py.String.of_string (String.make 1 c) let char_of_py obj = let s = Py.String.to_string obj in if String.length s <> 1 then raise (Py.Err (TypeError, Printf.sprintf "char expected but \"%s\" given" s)); s.[0] let bytes_capsule : (bytes -> Py.Object.t) * (Py.Object.t -> bytes) = Py.Capsule.make "ocaml.bytes" let raise_index_out_of_bounds ~index ~length = raise (Py.Err (IndexError, Printf.sprintf "Index %d out of bounds 0<=.<%d" index length)) type generic_python_function = args_tuple:Py.Object.t -> keywords_dict:Py.Object.t -> Py.Object.t module PolymorphicFunction = struct type t = { make : TypeList.t -> generic_python_function; table : generic_python_function TypeList.Hashtbl.t; } let table : t option ExtensibleArray.t = ExtensibleArray.create None 16 let get index = Option.get (ExtensibleArray.get table index) let push f = ExtensibleArray.push_f table (fun index -> Some (f index)) end let get_floatarray obj = try Py.Array.numpy_get_array obj with Not_found -> let len = Py.Sequence.length obj in let result = Array.Floatarray.create len in for i = 0 to len - 1 do Array.Floatarray.set result i (Py.Float.to_float (Py.Sequence.get_item obj i)); done; result module Extension_constructor = struct let (to_python, of_python) : (extension_constructor -> Py.Object.t) * (Py.Object.t -> extension_constructor) = Py.Capsule.make "extension_constructor" end let exception_class = ref Py.none let pending_module_table : Py.Object.t Lazy.t Path.Map.t ref = ref Path.Map.empty let pending_modules : Py.Object.t Lazy.t ExtensibleArray.t = ExtensibleArray.create (lazy (failwith "not yet available")) 16
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