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pprintast.ml
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pprintast.ml
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(**************************************************************************)
(* *)
(* OCaml *)
(* *)
(* Thomas Gazagnaire, OCamlPro *)
(* Fabrice Le Fessant, INRIA Saclay *)
(* Hongbo Zhang, University of Pennsylvania *)
(* *)
(* Copyright 2007 Institut National de Recherche en Informatique et *)
(* en Automatique. *)
(* *)
(* All rights reserved. This file is distributed under the terms of *)
(* the GNU Lesser General Public License version 2.1, with the *)
(* special exception on linking described in the file LICENSE. *)
(* *)
(**************************************************************************)
(* Original Code from Ber-metaocaml, modified for 3.12.0 and fixed *)
(* Printing code expressions *)
(* Authors: Ed Pizzi, Fabrice Le Fessant *)
(* Extensive Rewrite: Hongbo Zhang: University of Pennsylvania *)
(* TODO more fine-grained precedence pretty-printing *)
open Asttypes
open Format
open Location
open Longident
open Parsetree
open Ast_helper
let prefix_symbols = [ '!'; '?'; '~' ] ;;
let infix_symbols = [ '='; '<'; '>'; '@'; '^'; '|'; '&'; '+'; '-'; '*'; '/';
'$'; '%'; '#' ]
(* type fixity = Infix| Prefix *)
let special_infix_strings =
["asr"; "land"; "lor"; "lsl"; "lsr"; "lxor"; "mod"; "or"; ":="; "!="; "::" ]
(* determines if the string is an infix string.
checks backwards, first allowing a renaming postfix ("_102") which
may have resulted from Pexp -> Texp -> Pexp translation, then checking
if all the characters in the beginning of the string are valid infix
characters. *)
let fixity_of_string = function
| s when List.mem s special_infix_strings -> `Infix s
| s when List.mem s.[0] infix_symbols -> `Infix s
| s when List.mem s.[0] prefix_symbols -> `Prefix s
| s when s.[0] = '.' -> `Mixfix s
| _ -> `Normal
let view_fixity_of_exp = function
| {pexp_desc = Pexp_ident {txt=Lident l;_}; pexp_attributes = []} ->
fixity_of_string l
| _ -> `Normal
let is_infix = function | `Infix _ -> true | _ -> false
let is_mixfix = function `Mixfix _ -> true | _ -> false
(* which identifiers are in fact operators needing parentheses *)
let needs_parens txt =
let fix = fixity_of_string txt in
is_infix fix
|| is_mixfix fix
|| List.mem txt.[0] prefix_symbols
(* some infixes need spaces around parens to avoid clashes with comment
syntax *)
let needs_spaces txt =
txt.[0]='*' || txt.[String.length txt - 1] = '*'
(* add parentheses to binders when they are in fact infix or prefix operators *)
let protect_ident ppf txt =
let format : (_, _, _) format =
if not (needs_parens txt) then "%s"
else if needs_spaces txt then "(@;%s@;)"
else "(%s)"
in fprintf ppf format txt
let protect_longident ppf print_longident longprefix txt =
let format : (_, _, _) format =
if not (needs_parens txt) then "%a.%s"
else if needs_spaces txt then "%a.(@;%s@;)"
else "%a.(%s)" in
fprintf ppf format print_longident longprefix txt
type space_formatter = (unit, Format.formatter, unit) format
let override = function
| Override -> "!"
| Fresh -> ""
(* variance encoding: need to sync up with the [parser.mly] *)
let type_variance = function
| Invariant -> ""
| Covariant -> "+"
| Contravariant -> "-"
type construct =
[ `cons of expression list
| `list of expression list
| `nil
| `normal
| `simple of Longident.t
| `tuple ]
let view_expr x =
match x.pexp_desc with
| Pexp_construct ( {txt= Lident "()"; _},_) -> `tuple
| Pexp_construct ( {txt= Lident "[]";_},_) -> `nil
| Pexp_construct ( {txt= Lident"::";_},Some _) ->
let rec loop exp acc = match exp with
| {pexp_desc=Pexp_construct ({txt=Lident "[]";_},_);
pexp_attributes = []} ->
(List.rev acc,true)
| {pexp_desc=
Pexp_construct ({txt=Lident "::";_},
Some ({pexp_desc= Pexp_tuple([e1;e2]);
pexp_attributes = []}));
pexp_attributes = []}
->
loop e2 (e1::acc)
| e -> (List.rev (e::acc),false) in
let (ls,b) = loop x [] in
if b then
`list ls
else `cons ls
| Pexp_construct (x,None) -> `simple (x.txt)
| _ -> `normal
let is_simple_construct :construct -> bool = function
| `nil | `tuple | `list _ | `simple _ -> true
| `cons _ | `normal -> false
let pp = fprintf
type ctxt = {
pipe : bool;
semi : bool;
ifthenelse : bool;
}
let reset_ctxt = { pipe=false; semi=false; ifthenelse=false }
let under_pipe ctxt = { ctxt with pipe=true }
let under_semi ctxt = { ctxt with semi=true }
let under_ifthenelse ctxt = { ctxt with ifthenelse=true }
(*
let reset_semi ctxt = { ctxt with semi=false }
let reset_ifthenelse ctxt = { ctxt with ifthenelse=false }
let reset_pipe ctxt = { ctxt with pipe=false }
*)
let list : 'a . ?sep:space_formatter -> ?first:space_formatter ->
?last:space_formatter -> (Format.formatter -> 'a -> unit) ->
Format.formatter -> 'a list -> unit
= fun ?sep ?first ?last fu f xs ->
let first = match first with Some x -> x |None -> ("": _ format6)
and last = match last with Some x -> x |None -> ("": _ format6)
and sep = match sep with Some x -> x |None -> ("@ ": _ format6) in
let aux f = function
| [] -> ()
| [x] -> fu f x
| xs ->
let rec loop f = function
| [x] -> fu f x
| x::xs -> fu f x; pp f sep; loop f xs;
| _ -> assert false in begin
pp f first; loop f xs; pp f last;
end in
aux f xs
let option : 'a. ?first:space_formatter -> ?last:space_formatter ->
(Format.formatter -> 'a -> unit) -> Format.formatter -> 'a option -> unit
= fun ?first ?last fu f a ->
let first = match first with Some x -> x | None -> ("": _ format6)
and last = match last with Some x -> x | None -> ("": _ format6) in
match a with
| None -> ()
| Some x -> pp f first; fu f x; pp f last
let paren: 'a . ?first:space_formatter -> ?last:space_formatter ->
bool -> (Format.formatter -> 'a -> unit) -> Format.formatter -> 'a -> unit
= fun ?(first=("": _ format6)) ?(last=("": _ format6)) b fu f x ->
if b then (pp f "("; pp f first; fu f x; pp f last; pp f ")")
else fu f x
let rec longident f = function
| Lident s -> protect_ident f s
| Ldot(y,s) -> protect_longident f longident y s
| Lapply (y,s) ->
pp f "%a(%a)" longident y longident s
let longident_loc f x = pp f "%a" longident x.txt
let constant f = function
| Pconst_char i -> pp f "%C" i
| Pconst_string (i, None) -> pp f "%S" i
| Pconst_string (i, Some delim) -> pp f "{%s|%s|%s}" delim i delim
| Pconst_integer (i, None) -> paren (i.[0]='-') (fun f -> pp f "%s") f i
| Pconst_integer (i, Some m) ->
paren (i.[0]='-') (fun f (i, m) -> pp f "%s%c" i m) f (i,m)
| Pconst_float (i, None) -> paren (i.[0]='-') (fun f -> pp f "%s") f i
| Pconst_float (i, Some m) -> paren (i.[0]='-') (fun f (i,m) ->
pp f "%s%c" i m) f (i,m)
(* trailing space*)
let mutable_flag f = function
| Immutable -> ()
| Mutable -> pp f "mutable@;"
let virtual_flag f = function
| Concrete -> ()
| Virtual -> pp f "virtual@;"
(* trailing space added *)
let rec_flag f rf =
match rf with
| Nonrecursive -> ()
| Recursive -> pp f "rec "
let nonrec_flag f rf =
match rf with
| Nonrecursive -> pp f "nonrec "
| Recursive -> ()
let direction_flag f = function
| Upto -> pp f "to@ "
| Downto -> pp f "downto@ "
let private_flag f = function
| Public -> ()
| Private -> pp f "private@ "
let constant_string f s = pp f "%S" s
let tyvar f str = pp f "'%s" str
let tyvar_loc f str = pp f "'%s" str.txt
let string_quot f x = pp f "`%s" x
(* c ['a,'b] *)
let rec class_params_def ctxt f = function
| [] -> ()
| l ->
pp f "[%a] " (* space *)
(list (type_param ctxt) ~sep:",") l
and type_with_label ctxt f (label, c) =
match label with
| Nolabel -> core_type1 ctxt f c (* otherwise parenthesize *)
| Labelled s -> pp f "%s:%a" s (core_type1 ctxt) c
| Optional s -> pp f "?%s:%a" s (core_type1 ctxt) c
and core_type ctxt f x =
if x.ptyp_attributes <> [] then begin
pp f "((%a)%a)" (core_type ctxt) {x with ptyp_attributes=[]}
(attributes ctxt) x.ptyp_attributes
end
else match x.ptyp_desc with
| Ptyp_arrow (l, ct1, ct2) ->
pp f "@[<2>%a@;->@;%a@]" (* FIXME remove parens later *)
(type_with_label ctxt) (l,ct1) (core_type ctxt) ct2
| Ptyp_alias (ct, s) ->
pp f "@[<2>%a@;as@;'%s@]" (core_type1 ctxt) ct s
| Ptyp_poly ([], ct) ->
core_type ctxt f ct
| Ptyp_poly (sl, ct) ->
pp f "@[<2>%a%a@]"
(fun f l ->
pp f "%a"
(fun f l -> match l with
| [] -> ()
| _ ->
pp f "%a@;.@;"
(list tyvar_loc ~sep:"@;") l)
l)
sl (core_type ctxt) ct
| _ -> pp f "@[<2>%a@]" (core_type1 ctxt) x
and core_type1 ctxt f x =
if x.ptyp_attributes <> [] then core_type ctxt f x
else match x.ptyp_desc with
| Ptyp_any -> pp f "_";
| Ptyp_var s -> tyvar f s;
| Ptyp_tuple l -> pp f "(%a)" (list (core_type1 ctxt) ~sep:"@;*@;") l
| Ptyp_constr (li, l) ->
pp f (* "%a%a@;" *) "%a%a"
(fun f l -> match l with
|[] -> ()
|[x]-> pp f "%a@;" (core_type1 ctxt) x
| _ -> list ~first:"(" ~last:")@;" (core_type ctxt) ~sep:",@;" f l)
l longident_loc li
| Ptyp_variant (l, closed, low) ->
let type_variant_helper f x =
match x with
| Rtag (l, attrs, _, ctl) ->
pp f "@[<2>%a%a@;%a@]" string_quot l.txt
(fun f l -> match l with
|[] -> ()
| _ -> pp f "@;of@;%a"
(list (core_type ctxt) ~sep:"&") ctl) ctl
(attributes ctxt) attrs
| Rinherit ct -> core_type ctxt f ct in
pp f "@[<2>[%a%a]@]"
(fun f l ->
match l, closed with
| [], Closed -> ()
| [], Open -> pp f ">" (* Cf #7200: print [>] correctly *)
| _ ->
pp f "%s@;%a"
(match (closed,low) with
| (Closed,None) -> ""
| (Closed,Some _) -> "<" (* FIXME desugar the syntax sugar*)
| (Open,_) -> ">")
(list type_variant_helper ~sep:"@;<1 -2>| ") l) l
(fun f low -> match low with
|Some [] |None -> ()
|Some xs ->
pp f ">@ %a"
(list string_quot) xs) low
| Ptyp_object (l, o) ->
let core_field_type f = function
| Otag (l, attrs, ct) ->
pp f "@[<hov2>%s: %a@ %a@ @]" l.txt
(core_type ctxt) ct (attributes ctxt) attrs (* Cf #7200 *)
| Oinherit ct ->
pp f "@[<hov2>%a@ @]" (core_type ctxt) ct
in
let field_var f = function
| Asttypes.Closed -> ()
| Asttypes.Open ->
match l with
| [] -> pp f ".."
| _ -> pp f " ;.."
in
pp f "@[<hov2><@ %a%a@ > @]" (list core_field_type ~sep:";") l
field_var o (* Cf #7200 *)
| Ptyp_class (li, l) -> (*FIXME*)
pp f "@[<hov2>%a#%a@]"
(list (core_type ctxt) ~sep:"," ~first:"(" ~last:")") l
longident_loc li
| Ptyp_package (lid, cstrs) ->
let aux f (s, ct) =
pp f "type %a@ =@ %a" longident_loc s (core_type ctxt) ct in
(match cstrs with
|[] -> pp f "@[<hov2>(module@ %a)@]" longident_loc lid
|_ ->
pp f "@[<hov2>(module@ %a@ with@ %a)@]" longident_loc lid
(list aux ~sep:"@ and@ ") cstrs)
| Ptyp_extension e -> extension ctxt f e
| _ -> paren true (core_type ctxt) f x
(********************pattern********************)
(* be cautious when use [pattern], [pattern1] is preferred *)
and pattern ctxt f x =
let rec list_of_pattern acc = function (* only consider ((A|B)|C)*)
| {ppat_desc= Ppat_or (p1,p2); ppat_attributes = []} ->
list_of_pattern (p2::acc) p1
| x -> x::acc
in
if x.ppat_attributes <> [] then begin
pp f "((%a)%a)" (pattern ctxt) {x with ppat_attributes=[]}
(attributes ctxt) x.ppat_attributes
end
else match x.ppat_desc with
| Ppat_alias (p, s) ->
pp f "@[<2>%a@;as@;%a@]" (pattern ctxt) p protect_ident s.txt (* RA*)
| Ppat_or _ -> (* *)
pp f "@[<hov0>%a@]" (list ~sep:"@,|" (pattern ctxt))
(list_of_pattern [] x)
| _ -> pattern1 ctxt f x
and pattern1 ctxt (f:Format.formatter) (x:pattern) : unit =
let rec pattern_list_helper f = function
| {ppat_desc =
Ppat_construct
({ txt = Lident("::") ;_},
Some ({ppat_desc = Ppat_tuple([pat1; pat2]);_}));
ppat_attributes = []}
->
pp f "%a::%a" (simple_pattern ctxt) pat1 pattern_list_helper pat2 (*RA*)
| p -> pattern1 ctxt f p
in
if x.ppat_attributes <> [] then pattern ctxt f x
else match x.ppat_desc with
| Ppat_variant (l, Some p) ->
pp f "@[<2>`%s@;%a@]" l (simple_pattern ctxt) p
| Ppat_construct (({txt=Lident("()"|"[]");_}), _) -> simple_pattern ctxt f x
| Ppat_construct (({txt;_} as li), po) ->
(* FIXME The third field always false *)
if txt = Lident "::" then
pp f "%a" pattern_list_helper x
else
(match po with
| Some x -> pp f "%a@;%a" longident_loc li (simple_pattern ctxt) x
| None -> pp f "%a" longident_loc li)
| _ -> simple_pattern ctxt f x
and simple_pattern ctxt (f:Format.formatter) (x:pattern) : unit =
if x.ppat_attributes <> [] then pattern ctxt f x
else match x.ppat_desc with
| Ppat_construct (({txt=Lident ("()"|"[]" as x);_}), _) -> pp f "%s" x
| Ppat_any -> pp f "_";
| Ppat_var ({txt = txt;_}) -> protect_ident f txt
| Ppat_array l ->
pp f "@[<2>[|%a|]@]" (list (pattern1 ctxt) ~sep:";") l
| Ppat_unpack (s) ->
pp f "(module@ %s)@ " s.txt
| Ppat_type li ->
pp f "#%a" longident_loc li
| Ppat_record (l, closed) ->
let longident_x_pattern f (li, p) =
match (li,p) with
| ({txt=Lident s;_ },
{ppat_desc=Ppat_var {txt;_};
ppat_attributes=[]; _})
when s = txt ->
pp f "@[<2>%a@]" longident_loc li
| _ ->
pp f "@[<2>%a@;=@;%a@]" longident_loc li (pattern1 ctxt) p
in
begin match closed with
| Closed ->
pp f "@[<2>{@;%a@;}@]" (list longident_x_pattern ~sep:";@;") l
| _ ->
pp f "@[<2>{@;%a;_}@]" (list longident_x_pattern ~sep:";@;") l
end
| Ppat_tuple l ->
pp f "@[<1>(%a)@]" (list ~sep:",@;" (pattern1 ctxt)) l (* level1*)
| Ppat_constant (c) -> pp f "%a" constant c
| Ppat_interval (c1, c2) -> pp f "%a..%a" constant c1 constant c2
| Ppat_variant (l,None) -> pp f "`%s" l
| Ppat_constraint (p, ct) ->
pp f "@[<2>(%a@;:@;%a)@]" (pattern1 ctxt) p (core_type ctxt) ct
| Ppat_lazy p ->
pp f "@[<2>(lazy@;%a)@]" (pattern1 ctxt) p
| Ppat_exception p ->
pp f "@[<2>exception@;%a@]" (pattern1 ctxt) p
| Ppat_extension e -> extension ctxt f e
| Ppat_open (lid, p) ->
let with_paren =
match p.ppat_desc with
| Ppat_array _ | Ppat_record _
| Ppat_construct (({txt=Lident ("()"|"[]");_}), _) -> false
| _ -> true in
pp f "@[<2>%a.%a @]" longident_loc lid
(paren with_paren @@ pattern1 ctxt) p
| _ -> paren true (pattern ctxt) f x
and label_exp ctxt f (l,opt,p) =
match l with
| Nolabel ->
(* single case pattern parens needed here *)
pp f "%a@ " (simple_pattern ctxt) p
| Optional rest ->
begin match p with
| {ppat_desc = Ppat_var {txt;_}; ppat_attributes = []}
when txt = rest ->
(match opt with
| Some o -> pp f "?(%s=@;%a)@;" rest (expression ctxt) o
| None -> pp f "?%s@ " rest)
| _ ->
(match opt with
| Some o ->
pp f "?%s:(%a=@;%a)@;"
rest (pattern1 ctxt) p (expression ctxt) o
| None -> pp f "?%s:%a@;" rest (simple_pattern ctxt) p)
end
| Labelled l -> match p with
| {ppat_desc = Ppat_var {txt;_}; ppat_attributes = []}
when txt = l ->
pp f "~%s@;" l
| _ -> pp f "~%s:%a@;" l (simple_pattern ctxt) p
and sugar_expr ctxt f e =
if e.pexp_attributes <> [] then false
else match e.pexp_desc with
| Pexp_apply ({ pexp_desc = Pexp_ident {txt = id; _};
pexp_attributes=[]; _}, args)
when List.for_all (fun (lab, _) -> lab = Nolabel) args -> begin
let print_indexop a path_prefix assign left right print_index indices
rem_args =
let print_path ppf = function
| None -> ()
| Some m -> pp ppf ".%a" longident m in
match assign, rem_args with
| false, [] ->
pp f "@[%a%a%s%a%s@]"
(simple_expr ctxt) a print_path path_prefix
left (list ~sep:"," print_index) indices right; true
| true, [v] ->
pp f "@[%a%a%s%a%s@ <-@;<1 2>%a@]"
(simple_expr ctxt) a print_path path_prefix
left (list ~sep:"," print_index) indices right
(simple_expr ctxt) v; true
| _ -> false in
match id, List.map snd args with
| Lident "!", [e] ->
pp f "@[<hov>!%a@]" (simple_expr ctxt) e; true
| Ldot (path, ("get"|"set" as func)), a :: other_args -> begin
let assign = func = "set" in
let print = print_indexop a None assign in
match path, other_args with
| Lident "Array", i :: rest ->
print ".(" ")" (expression ctxt) [i] rest
| Lident "String", i :: rest ->
print ".[" "]" (expression ctxt) [i] rest
| Ldot (Lident "Bigarray", "Array1"), i1 :: rest ->
print ".{" "}" (simple_expr ctxt) [i1] rest
| Ldot (Lident "Bigarray", "Array2"), i1 :: i2 :: rest ->
print ".{" "}" (simple_expr ctxt) [i1; i2] rest
| Ldot (Lident "Bigarray", "Array3"), i1 :: i2 :: i3 :: rest ->
print ".{" "}" (simple_expr ctxt) [i1; i2; i3] rest
| Ldot (Lident "Bigarray", "Genarray"),
{pexp_desc = Pexp_array indexes; pexp_attributes = []} :: rest ->
print ".{" "}" (simple_expr ctxt) indexes rest
| _ -> false
end
| (Lident s | Ldot(_,s)) , a :: i :: rest
when s.[0] = '.' ->
let n = String.length s in
(* extract operator:
assignment operators end with [right_bracket ^ "<-"],
access operators end with [right_bracket] directly
*)
let assign = s.[n - 1] = '-' in
let kind =
(* extract the right end bracket *)
if assign then s.[n - 3] else s.[n - 1] in
let left, right = match kind with
| ')' -> '(', ")"
| ']' -> '[', "]"
| '}' -> '{', "}"
| _ -> assert false in
let path_prefix = match id with
| Ldot(m,_) -> Some m
| _ -> None in
let left = String.sub s 0 (1+String.index s left) in
print_indexop a path_prefix assign left right
(expression ctxt) [i] rest
| _ -> false
end
| _ -> false
and expression ctxt f x =
if x.pexp_attributes <> [] then
pp f "((%a)@,%a)" (expression ctxt) {x with pexp_attributes=[]}
(attributes ctxt) x.pexp_attributes
else match x.pexp_desc with
| Pexp_function _ | Pexp_fun _ | Pexp_match _ | Pexp_try _ | Pexp_sequence _
when ctxt.pipe || ctxt.semi ->
paren true (expression reset_ctxt) f x
| Pexp_ifthenelse _ | Pexp_sequence _ when ctxt.ifthenelse ->
paren true (expression reset_ctxt) f x
| Pexp_let _ | Pexp_letmodule _ | Pexp_open _ | Pexp_letexception _
when ctxt.semi ->
paren true (expression reset_ctxt) f x
| Pexp_fun (l, e0, p, e) ->
pp f "@[<2>fun@;%a->@;%a@]"
(label_exp ctxt) (l, e0, p)
(expression ctxt) e
| Pexp_function l ->
pp f "@[<hv>function%a@]" (case_list ctxt) l
| Pexp_match (e, l) ->
pp f "@[<hv0>@[<hv0>@[<2>match %a@]@ with@]%a@]"
(expression reset_ctxt) e (case_list ctxt) l
| Pexp_try (e, l) ->
pp f "@[<0>@[<hv2>try@ %a@]@ @[<0>with%a@]@]"
(* "try@;@[<2>%a@]@\nwith@\n%a"*)
(expression reset_ctxt) e (case_list ctxt) l
| Pexp_let (rf, l, e) ->
(* pp f "@[<2>let %a%a in@;<1 -2>%a@]"
(*no indentation here, a new line*) *)
(* rec_flag rf *)
pp f "@[<2>%a in@;<1 -2>%a@]"
(bindings reset_ctxt) (rf,l)
(expression ctxt) e
| Pexp_apply (e, l) ->
begin if not (sugar_expr ctxt f x) then
match view_fixity_of_exp e with
| `Infix s ->
begin match l with
| [ (Nolabel, _) as arg1; (Nolabel, _) as arg2 ] ->
(* FIXME associativity label_x_expression_param *)
pp f "@[<2>%a@;%s@;%a@]"
(label_x_expression_param reset_ctxt) arg1 s
(label_x_expression_param ctxt) arg2
| _ ->
pp f "@[<2>%a %a@]"
(simple_expr ctxt) e
(list (label_x_expression_param ctxt)) l
end
| `Prefix s ->
let s =
if List.mem s ["~+";"~-";"~+.";"~-."] &&
(match l with
(* See #7200: avoid turning (~- 1) into (- 1) which is
parsed as an int literal *)
|[(_,{pexp_desc=Pexp_constant _})] -> false
| _ -> true)
then String.sub s 1 (String.length s -1)
else s in
begin match l with
| [(Nolabel, x)] ->
pp f "@[<2>%s@;%a@]" s (simple_expr ctxt) x
| _ ->
pp f "@[<2>%a %a@]" (simple_expr ctxt) e
(list (label_x_expression_param ctxt)) l
end
| _ ->
pp f "@[<hov2>%a@]" begin fun f (e,l) ->
pp f "%a@ %a" (expression2 ctxt) e
(list (label_x_expression_param reset_ctxt)) l
(* reset here only because [function,match,try,sequence]
are lower priority *)
end (e,l)
end
| Pexp_construct (li, Some eo)
when not (is_simple_construct (view_expr x))-> (* Not efficient FIXME*)
(match view_expr x with
| `cons ls -> list (simple_expr ctxt) f ls ~sep:"@;::@;"
| `normal ->
pp f "@[<2>%a@;%a@]" longident_loc li
(simple_expr ctxt) eo
| _ -> assert false)
| Pexp_setfield (e1, li, e2) ->
pp f "@[<2>%a.%a@ <-@ %a@]"
(simple_expr ctxt) e1 longident_loc li (simple_expr ctxt) e2
| Pexp_ifthenelse (e1, e2, eo) ->
(* @;@[<2>else@ %a@]@] *)
let fmt:(_,_,_)format ="@[<hv0>@[<2>if@ %a@]@;@[<2>then@ %a@]%a@]" in
let expression_under_ifthenelse = expression (under_ifthenelse ctxt) in
pp f fmt expression_under_ifthenelse e1 expression_under_ifthenelse e2
(fun f eo -> match eo with
| Some x ->
pp f "@;@[<2>else@;%a@]" (expression (under_semi ctxt)) x
| None -> () (* pp f "()" *)) eo
| Pexp_sequence _ ->
let rec sequence_helper acc = function
| {pexp_desc=Pexp_sequence(e1,e2); pexp_attributes = []} ->
sequence_helper (e1::acc) e2
| v -> List.rev (v::acc) in
let lst = sequence_helper [] x in
pp f "@[<hv>%a@]"
(list (expression (under_semi ctxt)) ~sep:";@;") lst
| Pexp_new (li) ->
pp f "@[<hov2>new@ %a@]" longident_loc li;
| Pexp_setinstvar (s, e) ->
pp f "@[<hov2>%s@ <-@ %a@]" s.txt (expression ctxt) e
| Pexp_override l -> (* FIXME *)
let string_x_expression f (s, e) =
pp f "@[<hov2>%s@ =@ %a@]" s.txt (expression ctxt) e in
pp f "@[<hov2>{<%a>}@]"
(list string_x_expression ~sep:";" ) l;
| Pexp_letmodule (s, me, e) ->
pp f "@[<hov2>let@ module@ %s@ =@ %a@ in@ %a@]" s.txt
(module_expr reset_ctxt) me (expression ctxt) e
| Pexp_letexception (cd, e) ->
pp f "@[<hov2>let@ exception@ %a@ in@ %a@]"
(extension_constructor ctxt) cd
(expression ctxt) e
| Pexp_assert e ->
pp f "@[<hov2>assert@ %a@]" (simple_expr ctxt) e
| Pexp_lazy (e) ->
pp f "@[<hov2>lazy@ %a@]" (simple_expr ctxt) e
(* Pexp_poly: impossible but we should print it anyway, rather than
assert false *)
| Pexp_poly (e, None) ->
pp f "@[<hov2>!poly!@ %a@]" (simple_expr ctxt) e
| Pexp_poly (e, Some ct) ->
pp f "@[<hov2>(!poly!@ %a@ : %a)@]"
(simple_expr ctxt) e (core_type ctxt) ct
| Pexp_open (ovf, lid, e) ->
pp f "@[<2>let open%s %a in@;%a@]" (override ovf) longident_loc lid
(expression ctxt) e
| Pexp_variant (l,Some eo) ->
pp f "@[<2>`%s@;%a@]" l (simple_expr ctxt) eo
| Pexp_extension e -> extension ctxt f e
| Pexp_unreachable -> pp f "."
| _ -> expression1 ctxt f x
and expression1 ctxt f x =
if x.pexp_attributes <> [] then expression ctxt f x
else match x.pexp_desc with
| Pexp_object cs -> pp f "%a" (class_structure ctxt) cs
| _ -> expression2 ctxt f x
(* used in [Pexp_apply] *)
and expression2 ctxt f x =
if x.pexp_attributes <> [] then expression ctxt f x
else match x.pexp_desc with
| Pexp_field (e, li) ->
pp f "@[<hov2>%a.%a@]" (simple_expr ctxt) e longident_loc li
| Pexp_send (e, s) -> pp f "@[<hov2>%a#%s@]" (simple_expr ctxt) e s.txt
| _ -> simple_expr ctxt f x
and simple_expr ctxt f x =
if x.pexp_attributes <> [] then expression ctxt f x
else match x.pexp_desc with
| Pexp_construct _ when is_simple_construct (view_expr x) ->
(match view_expr x with
| `nil -> pp f "[]"
| `tuple -> pp f "()"
| `list xs ->
pp f "@[<hv0>[%a]@]"
(list (expression (under_semi ctxt)) ~sep:";@;") xs
| `simple x -> longident f x
| _ -> assert false)
| Pexp_ident li ->
longident_loc f li
(* (match view_fixity_of_exp x with *)
(* |`Normal -> longident_loc f li *)
(* | `Prefix _ | `Infix _ -> pp f "( %a )" longident_loc li) *)
| Pexp_constant c -> constant f c;
| Pexp_pack me ->
pp f "(module@;%a)" (module_expr ctxt) me
| Pexp_newtype (lid, e) ->
pp f "fun@;(type@;%s)@;->@;%a" lid.txt (expression ctxt) e
| Pexp_tuple l ->
pp f "@[<hov2>(%a)@]" (list (simple_expr ctxt) ~sep:",@;") l
| Pexp_constraint (e, ct) ->
pp f "(%a : %a)" (expression ctxt) e (core_type ctxt) ct
| Pexp_coerce (e, cto1, ct) ->
pp f "(%a%a :> %a)" (expression ctxt) e
(option (core_type ctxt) ~first:" : " ~last:" ") cto1 (* no sep hint*)
(core_type ctxt) ct
| Pexp_variant (l, None) -> pp f "`%s" l
| Pexp_record (l, eo) ->
let longident_x_expression f ( li, e) =
match e with
| {pexp_desc=Pexp_ident {txt;_};
pexp_attributes=[]; _} when li.txt = txt ->
pp f "@[<hov2>%a@]" longident_loc li
| _ ->
pp f "@[<hov2>%a@;=@;%a@]" longident_loc li (simple_expr ctxt) e
in
pp f "@[<hv0>@[<hv2>{@;%a%a@]@;}@]"(* "@[<hov2>{%a%a}@]" *)
(option ~last:" with@;" (simple_expr ctxt)) eo
(list longident_x_expression ~sep:";@;") l
| Pexp_array (l) ->
pp f "@[<0>@[<2>[|%a|]@]@]"
(list (simple_expr (under_semi ctxt)) ~sep:";") l
| Pexp_while (e1, e2) ->
let fmt : (_,_,_) format = "@[<2>while@;%a@;do@;%a@;done@]" in
pp f fmt (expression ctxt) e1 (expression ctxt) e2
| Pexp_for (s, e1, e2, df, e3) ->
let fmt:(_,_,_)format =
"@[<hv0>@[<hv2>@[<2>for %a =@;%a@;%a%a@;do@]@;%a@]@;done@]" in
let expression = expression ctxt in
pp f fmt (pattern ctxt) s expression e1 direction_flag
df expression e2 expression e3
| _ -> paren true (expression ctxt) f x
and attributes ctxt f l =
List.iter (attribute ctxt f) l
and item_attributes ctxt f l =
List.iter (item_attribute ctxt f) l
and attribute ctxt f (s, e) =
pp f "@[<2>[@@%s@ %a]@]" s.txt (payload ctxt) e
and item_attribute ctxt f (s, e) =
pp f "@[<2>[@@@@%s@ %a]@]" s.txt (payload ctxt) e
and floating_attribute ctxt f (s, e) =
pp f "@[<2>[@@@@@@%s@ %a]@]" s.txt (payload ctxt) e
and value_description ctxt f x =
(* note: value_description has an attribute field,
but they're already printed by the callers this method *)
pp f "@[<hov2>%a%a@]" (core_type ctxt) x.pval_type
(fun f x ->
if x.pval_prim <> []
then pp f "@ =@ %a" (list constant_string) x.pval_prim
) x
and extension ctxt f (s, e) =
pp f "@[<2>[%%%s@ %a]@]" s.txt (payload ctxt) e
and item_extension ctxt f (s, e) =
pp f "@[<2>[%%%%%s@ %a]@]" s.txt (payload ctxt) e
and exception_declaration ctxt f ext =
pp f "@[<hov2>exception@ %a@]" (extension_constructor ctxt) ext
and class_signature ctxt f { pcsig_self = ct; pcsig_fields = l ;_} =
let class_type_field f x =
match x.pctf_desc with
| Pctf_inherit (ct) ->
pp f "@[<2>inherit@ %a@]%a" (class_type ctxt) ct
(item_attributes ctxt) x.pctf_attributes
| Pctf_val (s, mf, vf, ct) ->
pp f "@[<2>val @ %a%a%s@ :@ %a@]%a"
mutable_flag mf virtual_flag vf s.txt (core_type ctxt) ct
(item_attributes ctxt) x.pctf_attributes
| Pctf_method (s, pf, vf, ct) ->
pp f "@[<2>method %a %a%s :@;%a@]%a"
private_flag pf virtual_flag vf s.txt (core_type ctxt) ct
(item_attributes ctxt) x.pctf_attributes
| Pctf_constraint (ct1, ct2) ->
pp f "@[<2>constraint@ %a@ =@ %a@]%a"
(core_type ctxt) ct1 (core_type ctxt) ct2
(item_attributes ctxt) x.pctf_attributes
| Pctf_attribute a -> floating_attribute ctxt f a
| Pctf_extension e ->
item_extension ctxt f e;
item_attributes ctxt f x.pctf_attributes
in
pp f "@[<hv0>@[<hv2>object@[<1>%a@]@ %a@]@ end@]"
(fun f -> function
{ptyp_desc=Ptyp_any; ptyp_attributes=[]; _} -> ()
| ct -> pp f " (%a)" (core_type ctxt) ct) ct
(list class_type_field ~sep:"@;") l
(* call [class_signature] called by [class_signature] *)
and class_type ctxt f x =
match x.pcty_desc with
| Pcty_signature cs ->
class_signature ctxt f cs;
attributes ctxt f x.pcty_attributes
| Pcty_constr (li, l) ->
pp f "%a%a%a"
(fun f l -> match l with
| [] -> ()
| _ -> pp f "[%a]@ " (list (core_type ctxt) ~sep:"," ) l) l
longident_loc li
(attributes ctxt) x.pcty_attributes
| Pcty_arrow (l, co, cl) ->
pp f "@[<2>%a@;->@;%a@]" (* FIXME remove parens later *)
(type_with_label ctxt) (l,co)
(class_type ctxt) cl
| Pcty_extension e ->
extension ctxt f e;
attributes ctxt f x.pcty_attributes
| Pcty_open (ovf, lid, e) ->
pp f "@[<2>let open%s %a in@;%a@]" (override ovf) longident_loc lid
(class_type ctxt) e
(* [class type a = object end] *)
and class_type_declaration_list ctxt f l =
let class_type_declaration kwd f x =
let { pci_params=ls; pci_name={ txt; _ }; _ } = x in
pp f "@[<2>%s %a%a%s@ =@ %a@]%a" kwd
virtual_flag x.pci_virt
(class_params_def ctxt) ls txt
(class_type ctxt) x.pci_expr
(item_attributes ctxt) x.pci_attributes
in
match l with
| [] -> ()
| [x] -> class_type_declaration "class type" f x
| x :: xs ->
pp f "@[<v>%a@,%a@]"
(class_type_declaration "class type") x
(list ~sep:"@," (class_type_declaration "and")) xs
and class_field ctxt f x =
match x.pcf_desc with
| Pcf_inherit (ovf, ce, so) ->
pp f "@[<2>inherit@ %s@ %a%a@]%a" (override ovf)
(class_expr ctxt) ce
(fun f so -> match so with
| None -> ();
| Some (s) -> pp f "@ as %s" s.txt ) so
(item_attributes ctxt) x.pcf_attributes
| Pcf_val (s, mf, Cfk_concrete (ovf, e)) ->
pp f "@[<2>val%s %a%s =@;%a@]%a" (override ovf)
mutable_flag mf s.txt
(expression ctxt) e
(item_attributes ctxt) x.pcf_attributes
| Pcf_method (s, pf, Cfk_virtual ct) ->
pp f "@[<2>method virtual %a %s :@;%a@]%a"
private_flag pf s.txt
(core_type ctxt) ct
(item_attributes ctxt) x.pcf_attributes
| Pcf_val (s, mf, Cfk_virtual ct) ->
pp f "@[<2>val virtual %a%s :@ %a@]%a"
mutable_flag mf s.txt
(core_type ctxt) ct
(item_attributes ctxt) x.pcf_attributes
| Pcf_method (s, pf, Cfk_concrete (ovf, e)) ->
let bind e =
binding ctxt f
{pvb_pat=
{ppat_desc=Ppat_var s;ppat_loc=Location.none;ppat_attributes=[]};
pvb_expr=e;
pvb_attributes=[];
pvb_loc=Location.none;
}
in
pp f "@[<2>method%s %a%a@]%a"
(override ovf)
private_flag pf
(fun f -> function
| {pexp_desc=Pexp_poly (e, Some ct); pexp_attributes=[]; _} ->
pp f "%s :@;%a=@;%a"
s.txt (core_type ctxt) ct (expression ctxt) e
| {pexp_desc=Pexp_poly (e, None); pexp_attributes=[]; _} ->
bind e
| _ -> bind e) e
(item_attributes ctxt) x.pcf_attributes
| Pcf_constraint (ct1, ct2) ->
pp f "@[<2>constraint %a =@;%a@]%a"
(core_type ctxt) ct1
(core_type ctxt) ct2
(item_attributes ctxt) x.pcf_attributes
| Pcf_initializer (e) ->
pp f "@[<2>initializer@ %a@]%a"
(expression ctxt) e
(item_attributes ctxt) x.pcf_attributes
| Pcf_attribute a -> floating_attribute ctxt f a
| Pcf_extension e ->
item_extension ctxt f e;
item_attributes ctxt f x.pcf_attributes
and class_structure ctxt f { pcstr_self = p; pcstr_fields = l } =
pp f "@[<hv0>@[<hv2>object%a@;%a@]@;end@]"
(fun f p -> match p.ppat_desc with
| Ppat_any -> ()
| Ppat_constraint _ -> pp f " %a" (pattern ctxt) p
| _ -> pp f " (%a)" (pattern ctxt) p) p
(list (class_field ctxt)) l
and class_expr ctxt f x =
if x.pcl_attributes <> [] then begin
pp f "((%a)%a)" (class_expr ctxt) {x with pcl_attributes=[]}
(attributes ctxt) x.pcl_attributes
end else
match x.pcl_desc with
| Pcl_structure (cs) -> class_structure ctxt f cs
| Pcl_fun (l, eo, p, e) ->
pp f "fun@ %a@ ->@ %a"
(label_exp ctxt) (l,eo,p)
(class_expr ctxt) e
| Pcl_let (rf, l, ce) ->
pp f "%a@ in@ %a"
(bindings ctxt) (rf,l)
(class_expr ctxt) ce
| Pcl_apply (ce, l) ->
pp f "((%a)@ %a)" (* Cf: #7200 *)
(class_expr ctxt) ce
(list (label_x_expression_param ctxt)) l
| Pcl_constr (li, l) ->
pp f "%a%a"
(fun f l-> if l <>[] then
pp f "[%a]@ "
(list (core_type ctxt) ~sep:",") l) l
longident_loc li
| Pcl_constraint (ce, ct) ->
pp f "(%a@ :@ %a)"
(class_expr ctxt) ce
(class_type ctxt) ct
| Pcl_extension e -> extension ctxt f e
| Pcl_open (ovf, lid, e) ->
pp f "@[<2>let open%s %a in@;%a@]" (override ovf) longident_loc lid
(class_expr ctxt) e
and module_type ctxt f x =
if x.pmty_attributes <> [] then begin
pp f "((%a)%a)" (module_type ctxt) {x with pmty_attributes=[]}
(attributes ctxt) x.pmty_attributes
end else
match x.pmty_desc with
| Pmty_ident li ->
pp f "%a" longident_loc li;
| Pmty_alias li ->
pp f "(module %a)" longident_loc li;
| Pmty_signature (s) ->
pp f "@[<hv0>@[<hv2>sig@ %a@]@ end@]" (* "@[<hov>sig@ %a@ end@]" *)
(list (signature_item ctxt)) s (* FIXME wrong indentation*)
| Pmty_functor (_, None, mt2) ->
pp f "@[<hov2>functor () ->@ %a@]" (module_type ctxt) mt2
| Pmty_functor (s, Some mt1, mt2) ->
if s.txt = "_" then
pp f "@[<hov2>%a@ ->@ %a@]"
(module_type ctxt) mt1 (module_type ctxt) mt2
else
pp f "@[<hov2>functor@ (%s@ :@ %a)@ ->@ %a@]" s.txt
(module_type ctxt) mt1 (module_type ctxt) mt2
| Pmty_with (mt, l) ->
let with_constraint f = function
| Pwith_type (li, ({ptype_params= ls ;_} as td)) ->
let ls = List.map fst ls in
pp f "type@ %a %a =@ %a"
(list (core_type ctxt) ~sep:"," ~first:"(" ~last:")")
ls longident_loc li (type_declaration ctxt) td
| Pwith_module (li, li2) ->
pp f "module %a =@ %a" longident_loc li longident_loc li2;
| Pwith_typesubst (li, ({ptype_params=ls;_} as td)) ->
let ls = List.map fst ls in
pp f "type@ %a %a :=@ %a"
(list (core_type ctxt) ~sep:"," ~first:"(" ~last:")")
ls longident_loc li
(type_declaration ctxt) td
| Pwith_modsubst (li, li2) ->
pp f "module %a :=@ %a" longident_loc li longident_loc li2 in
(match l with
| [] -> pp f "@[<hov2>%a@]" (module_type ctxt) mt
| _ -> pp f "@[<hov2>(%a@ with@ %a)@]"
(module_type ctxt) mt (list with_constraint ~sep:"@ and@ ") l)
| Pmty_typeof me ->
pp f "@[<hov2>module@ type@ of@ %a@]" (module_expr ctxt) me