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(** Copyright 2025-2026, Victoria Ostrovskaya & Danil Usoltsev *)
(** SPDX-License-Identifier: LGPL-3.0-or-later *)
open Frontend.Ast
let string_of_bin_op = function
| Plus -> "+"
| Minus -> "-"
| Multiply -> "*"
| Division -> "/"
| And -> "&&"
| Or -> "||"
| GreatestEqual -> ">="
| LowestEqual -> "<="
| GreaterThan -> ">"
| LowerThan -> "<"
| Equal -> "="
| NotEqual -> "<>"
| Custom s -> s
;;
let string_of_unary_op = function
| Negative -> "-"
| Not -> "not"
;;
let pp_bin_op ppf op = Format.fprintf ppf "%s" (string_of_bin_op op)
let pp_unary_op ppf op = Format.fprintf ppf "%s" (string_of_unary_op op)
let pp_const ppf = function
| ConstInt i -> Format.fprintf ppf "%d" i
| ConstBool b -> Format.fprintf ppf "%b" b
| ConstString s -> Format.fprintf ppf "%S" s
| ConstChar c -> Format.fprintf ppf "'%c'" c
;;
let rec pp_pattern ppf = function
| PatVariable v -> Format.fprintf ppf "%s" v
| PatConst c -> pp_const ppf c
| PatAny -> Format.fprintf ppf "_"
| PatUnit -> Format.fprintf ppf "()"
| PatType (p, t) -> Format.fprintf ppf "(%a : %a)" pp_pattern p pp_ty t
| PatTuple (p1, p2, rest) ->
Format.fprintf
ppf
"(%a)"
(Format.pp_print_list ~pp_sep:(fun ppf () -> Format.fprintf ppf ", ") pp_pattern)
(p1 :: p2 :: rest)
| PatList ps ->
Format.fprintf
ppf
"[%a]"
(Format.pp_print_list ~pp_sep:(fun ppf () -> Format.fprintf ppf "; ") pp_pattern)
ps
| PatOption None -> Format.fprintf ppf "None"
| PatOption (Some p) -> Format.fprintf ppf "Some (%a)" pp_pattern p
| PatConstruct ("[]", None) -> Format.fprintf ppf "[]"
| PatConstruct ("::", Some (PatTuple (h, t, []))) ->
Format.fprintf ppf "%a::%a" pp_pattern h pp_pattern t
| PatConstruct (id, None) -> Format.fprintf ppf "%s" id
| PatConstruct (id, Some p) -> Format.fprintf ppf "%s (%a)" id pp_pattern p
and pp_expr ppf = function
| ExpIdent v -> Format.fprintf ppf "%s" v
| ExpConst c -> pp_const ppf c
| ExpBranch (c, t, None) -> Format.fprintf ppf "if %a then %a" pp_expr c pp_expr t
| ExpBranch (c, t, Some e) ->
Format.fprintf ppf "if %a then %a else %a" pp_expr c pp_expr t pp_expr e
| ExpBinOper (op, l, r) ->
Format.fprintf ppf "(%a %a %a)" pp_expr l pp_bin_op op pp_expr r
| ExpUnarOper (op, e) -> Format.fprintf ppf "(%a %a)" pp_unary_op op pp_expr e
| ExpTuple (e1, e2, rest) ->
Format.fprintf
ppf
"(%a)"
(Format.pp_print_list ~pp_sep:(fun ppf () -> Format.fprintf ppf ", ") pp_expr)
(e1 :: e2 :: rest)
| ExpList es ->
Format.fprintf
ppf
"[%a]"
(Format.pp_print_list ~pp_sep:(fun ppf () -> Format.fprintf ppf "; ") pp_expr)
es
| ExpLambda (p, ps, body) ->
Format.fprintf
ppf
"fun %a -> %a"
(Format.pp_print_list ~pp_sep:(fun ppf () -> Format.fprintf ppf " ") pp_pattern)
(p :: ps)
pp_expr
body
| ExpTypeAnnotation (e, t) -> Format.fprintf ppf "(%a : %a)" pp_expr e pp_ty t
| ExpLet (is_rec, bind, more, body) ->
let kw =
match is_rec with
| Rec -> "let rec"
| NonRec -> "let"
in
Format.fprintf ppf "%s %a in %a" kw pp_binds (bind, more) pp_expr body
| ExpApply _ as e ->
let f, args = flatten_apply e in
Format.fprintf
ppf
"%a %a"
pp_atomic_expr
f
(Format.pp_print_list ~pp_sep:(fun ppf () -> Format.fprintf ppf " ") pp_atomic_expr)
args
| ExpOption None -> Format.fprintf ppf "None"
| ExpOption (Some e) -> Format.fprintf ppf "Some (%a)" pp_expr e
| ExpFunction (first, more) ->
Format.fprintf
ppf
"function %a"
(Format.pp_print_list ~pp_sep:(fun ppf () -> Format.fprintf ppf " ") pp_case)
(first :: more)
| ExpMatch (e, first, more) ->
Format.fprintf
ppf
"match %a with %a"
pp_expr
e
(Format.pp_print_list ~pp_sep:(fun ppf () -> Format.fprintf ppf " ") pp_case)
(first :: more)
| ExpConstruct ("()", None) -> Format.fprintf ppf "()"
| ExpConstruct ("[]", None) -> Format.fprintf ppf "[]"
| ExpConstruct ("::", Some (ExpTuple (h, t, []))) ->
Format.fprintf ppf "%a::%a" pp_expr h pp_expr t
| ExpConstruct (id, None) -> Format.fprintf ppf "%s" id
| ExpConstruct (id, Some e) -> Format.fprintf ppf "%s (%a)" id pp_expr e
and pp_atomic_expr ppf = function
| (ExpIdent _ | ExpConst _ | ExpOption None | ExpConstruct (_, None)) as e ->
pp_expr ppf e
| e -> Format.fprintf ppf "(%a)" pp_expr e
and flatten_apply e =
let rec go f args =
match f with
| ExpApply (f', a) -> go f' (a :: args)
| _ -> f, args
in
go e []
and pp_case ppf (p, e) = Format.fprintf ppf "| %a -> %a" pp_pattern p pp_expr e
and pp_bind ppf (p, e) = Format.fprintf ppf "%a = %a" pp_pattern p pp_expr e
and pp_binds ppf (first, more) =
Format.fprintf ppf "%a" pp_bind first;
List.iter (fun b -> Format.fprintf ppf "@ and %a" pp_bind b) more
;;
let pp_structure_item ppf = function
| SEval e -> Format.fprintf ppf "%a;;" pp_expr e
| SValue (is_rec, bind, more) ->
let kw =
match is_rec with
| Rec -> "let rec"
| NonRec -> "let"
in
Format.fprintf ppf "%s %a;;" kw pp_binds (bind, more)
;;
let pp_structure ppf (lst : structure list) =
Format.pp_print_list
~pp_sep:(fun ppf () -> Format.fprintf ppf "@\n")
pp_structure_item
ppf
lst
;;