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ParseTree.ml
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ParseTree.ml
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(*
* Copyright (c) 2015 Stefan Krah. All rights reserved.
*
* This file is distributed under the terms of the Q Public License
* version 1.0.
*)
open Shared
(**********************************************************************)
(* Types *)
(**********************************************************************)
(* Translate position *)
let mk_loc = Location.make
(* type expression *)
type core_type =
{ core_type_desc: core_type_desc;
core_type_loc: Location.t }
(* type expression desc *)
and core_type_desc
= Ptyp_any (* _: type parameter *)
| Ptyp_var of string (* 'a: type parameter *)
| Ptyp_arrow of core_type * core_type (* t1 -> t2 *)
| Ptyp_tuple of core_type list (* t1 * ... * tn *)
| Ptyp_record of field list (* { l1 : t1; ...; ln : tn } *)
| Ptyp_constr of string * core_type list (* constr | t1 constr | (t1, ..., tn) constr *)
(* More like _construction_, i.e. application of a _constructor_ to
arguments. *)
and field =
{ pfield_name: string;
pfield_mutable: mutable_flag;
pfield_type: core_type;
pfield_loc: Location.t }
type type_declaration =
{ ptyp_name: string;
ptyp_params: core_type list;
ptyp_expr: core_type option;
ptyp_loc: Location.t }
let mk_typany ~pos =
{ core_type_desc = Ptyp_any;
core_type_loc = mk_loc pos }
let mk_typvar ~name ~pos =
{ core_type_desc = Ptyp_var name;
core_type_loc = mk_loc pos }
let mk_typarrow ~formals ~result ~pos =
{ core_type_desc = Ptyp_arrow (formals, result);
core_type_loc = mk_loc pos }
let mk_typ_or_tuple ~lst ~pos =
match lst with
[] -> internal_error "mk_typ_maybe_tuple: empty list"
| [x] -> x
| _ -> { core_type_desc = Ptyp_tuple lst;
core_type_loc = mk_loc pos }
let mk_typrecord ~lst ~pos =
{ core_type_desc = Ptyp_record lst;
core_type_loc = mk_loc pos }
let mk_typconstr ~name ~args ~pos =
{ core_type_desc = Ptyp_constr (name, args);
core_type_loc = mk_loc pos }
let mk_field ~name ~flag ~typ ~pos =
{ pfield_name = name;
pfield_mutable = flag;
pfield_type = typ;
pfield_loc = mk_loc pos }
(**********************************************************************)
(* Values *)
(**********************************************************************)
type value_description =
{ pvd_name: string;
pvd_kind: value_kind;
pvd_type: core_type option;
pvd_loc: Location.t }
(**********************************************************************)
(* Expressions *)
(**********************************************************************)
type expression =
{ pexp_desc: expression_desc;
pexp_type: core_type option;
pexp_loc: Location.t }
and expression_desc =
Pexp_any
| Pexp_nil
| Pexp_bool of bool
| Pexp_int of string
| Pexp_float of string
| Pexp_string of string
| Pexp_path of path
| Pexp_uminus of expression
| Pexp_op of expression * binary_operator * expression
| Pexp_assign of path * assign_operator * expression
| Pexp_tuple of expression list
| Pexp_record of (string * expression) list
| Pexp_array of expression * expression
| Pexp_if of expression * expression * expression option
| Pexp_while of expression * expression
| Pexp_for of value_binding list * expression * expression
| Pexp_lambda of lambda_expression
| Pexp_call of expression * expression
| Pexp_let of rec_flag * value_binding list * expression
| Pexp_sequence of expression list
and path
= Pvar_simple of string * Location.t
| Pvar_field of path * string * Location.t
| Pvar_subscript of path * expression * Location.t
and value_binding =
{ pvb_desc: value_description;
pvb_expr: expression }
and lambda_expression =
{ pfun_name: string;
pfun_params: value_description list;
pfun_body: expression }
(**********************************************************************)
(* Modules *)
(**********************************************************************)
type structure_item
= Pstr_type of type_declaration list
| Pstr_primitive of value_binding
| Pstr_value of rec_flag * value_binding list
type structure = structure_item list
type module_expr = Pmod_structure of structure
(**********************************************************************)
(* Create expressions *)
(**********************************************************************)
(* Add type constraint *)
let add_constraint ~expr ~typ =
match expr.pexp_type with
None -> { expr with pexp_type = Some typ }
| _ -> internal_error "setting type constraint twice"
(* Atoms *)
let mk_any ~pos =
{ pexp_desc = Pexp_any;
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_nil ~pos =
{ pexp_desc = Pexp_nil;
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_tuple ~lst ~pos =
{ pexp_desc = Pexp_tuple lst;
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_record ~lst ~pos =
{ pexp_desc = Pexp_record lst;
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_array ~size ~init ~pos =
{ pexp_desc = Pexp_array (size, init);
pexp_type = None;
pexp_loc = mk_loc pos }
(* Other expressions *)
let mk_bool ~value ~pos =
{ pexp_desc = Pexp_bool value;
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_int ~number ~pos =
{ pexp_desc = Pexp_int number;
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_float ~number ~pos =
{ pexp_desc = Pexp_float number;
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_str ~str ~pos =
{ pexp_desc = Pexp_string str;
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_path ~path ~pos =
{ pexp_desc = Pexp_path path;
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_uminus ~expr ~pos =
{ pexp_desc = Pexp_uminus expr;
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_op ~left ~op ~right ~pos =
{ pexp_desc = Pexp_op (left, op, right);
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_assign ~path ~expr ~op ~pos =
{ pexp_desc = Pexp_assign (path, op, expr);
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_if ~test ~then_expr ~else_expr ~pos =
{ pexp_desc = Pexp_if (test, then_expr, else_expr);
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_while ~test ~body ~pos =
{ pexp_desc = Pexp_while (test, body);
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_for ~loop_var ~pvd_pos ~lo ~hi ~body ~for_pos =
let desc = { pvd_name = loop_var;
pvd_kind = Loopvar;
pvd_type = None;
pvd_loc = mk_loc pvd_pos } in
let binding = { pvb_desc = desc;
pvb_expr = lo } in
{ pexp_desc = Pexp_for ([binding], hi, body);
pexp_type = None;
pexp_loc = mk_loc for_pos }
let trans_param x =
match x.pexp_desc with
Pexp_path (Pvar_simple (name, pos)) ->
{ pvd_name = name;
pvd_kind = Parameter;
pvd_type = x.pexp_type;
pvd_loc = pos }
| Pexp_any ->
{ pvd_name = "_";
pvd_kind = Ignore;
pvd_type = None;
pvd_loc = x.pexp_loc }
| _ -> Location.error x.pexp_loc "unsupported parameter"
let mk_lambda ~name ~params ~body ~pos =
let mk ~name ~params ~body ~pos =
let desc = Pexp_lambda { pfun_name = name;
pfun_params = params;
pfun_body = body }
in { pexp_desc = desc;
pexp_type = None;
pexp_loc = mk_loc pos }
in
let rec curry = function
[] -> internal_error "empty list of curried parameters"
| [p] -> let p' = trans_param p in
mk ~name ~params:[p'] ~body ~pos
| p :: tl -> let p' = trans_param p in
mk ~name ~params:[p'] ~body:(curry tl) ~pos
in
match params with
[{ pexp_desc = Pexp_tuple lst; _ }] -> let lst' = List.map trans_param lst in
mk ~name ~params:lst' ~body ~pos
| lst -> curry lst
let mk_call ~func ~args ~pos =
let mk f arg =
{ pexp_desc = Pexp_call (f, arg);
pexp_type = None;
pexp_loc = mk_loc pos }
in
let rec curry f = function
[] -> internal_error "empty list of curried parameters"
| [arg] -> mk f arg
| arg :: tl -> curry (mk f arg) tl
in curry func args
let mk_opcall ~name ~args ~pos =
let f = { pexp_desc = Pexp_path (Pvar_simple (name, mk_loc pos));
pexp_type = None;
pexp_loc = mk_loc pos }
in
let arg = match args with
[] -> internal_error "empty args"
| [x] -> x
| _ -> { pexp_desc = Pexp_tuple args;
pexp_type = None;
pexp_loc = mk_loc pos }
in { pexp_desc = Pexp_call (f, arg);
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_let ~rec_flag ~bindings ~body ~pos =
{ pexp_desc = Pexp_let (rec_flag, bindings, body);
pexp_type = None;
pexp_loc = mk_loc pos }
let mk_sequence ~lst ~pos =
match lst with
[] -> internal_error "empty sequence"
| [x] -> x
| _ -> { pexp_desc = Pexp_sequence lst;
pexp_type = None;
pexp_loc = mk_loc pos }
(**********************************************************************)
(* Create paths *)
(**********************************************************************)
let mk_simplevar ~name ~pos =
Pvar_simple (name, mk_loc pos)
let mk_fieldvar ~name ~field ~pos =
Pvar_field (name, field, mk_loc pos)
let mk_subscriptvar ~name ~subscript ~pos =
Pvar_subscript (name, subscript, mk_loc pos)
(**********************************************************************)
(* Create declarations *)
(**********************************************************************)
(* Type declaration: type ('a, 'b) t = texpr *)
let mk_typedec ~name ~params ~expr ~pos =
{ ptyp_name = name;
ptyp_params = params;
ptyp_expr = expr;
ptyp_loc = mk_loc pos }
(* External functions *)
let mk_external ~name ~type_expr ~label ~pos =
let expr = mk_str ~str:label ~pos in
let desc = { pvd_name = name;
pvd_kind = External;
pvd_type = Some type_expr;
pvd_loc = mk_loc pos }
in { pvb_desc = desc; pvb_expr = expr }
let mk_binding ~name ~expr ~pos =
let desc = { pvd_name = name;
pvd_kind = Vardec;
pvd_type = None;
pvd_loc = mk_loc pos }
in { pvb_desc = desc; pvb_expr = expr }
let mk_typed_binding ~name ~typ ~expr ~pos =
let desc = { pvd_name = name;
pvd_kind = Vardec;
pvd_type = Some typ;
pvd_loc = mk_loc pos }
in { pvb_desc = desc; pvb_expr = expr }
let mk_ignore ~expr ~pos ~typ =
let desc = { pvd_name = "_";
pvd_kind = Ignore;
pvd_type = typ;
pvd_loc = mk_loc pos }
in { pvb_desc = desc; pvb_expr = expr }