92 lines
2.2 KiB
OCaml
92 lines
2.2 KiB
OCaml
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(* camlp4r *)
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(* $Id$ *)
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type t 'te 'a 'b =
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Gramext.g_entry 'te -> list (Gramext.g_symbol 'te) ->
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(Stream.t 'te -> 'a) -> Stream.t 'te -> 'b
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;
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type tsep 'te 'a 'b =
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Gramext.g_entry 'te -> list (Gramext.g_symbol 'te) ->
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(Stream.t 'te -> 'a) -> (Stream.t 'te -> unit) -> Stream.t 'te -> 'b
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;
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value gen_fold0 final f e entry symbl psymb =
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let rec fold accu =
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parser
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[ [: a = psymb; s :] -> fold (f a accu) s
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| [: :] -> accu ]
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in
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parser [: a = fold e :] -> final a
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;
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value gen_fold1 final f e entry symbl psymb =
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let rec fold accu =
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parser
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[ [: a = psymb; s :] -> fold (f a accu) s
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| [: :] -> accu ]
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in
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parser [: a = psymb; a = fold (f a e) :] -> final a
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;
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value gen_fold0sep final f e entry symbl psymb psep =
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let failed =
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fun
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[ [symb; sep] -> Grammar.symb_failed_txt entry sep symb
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| _ -> "failed" ]
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in
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let rec kont accu =
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parser
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[ [: v = psep; a = psymb ? failed symbl; s :] -> kont (f a accu) s
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| [: :] -> accu ]
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in
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parser
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[ [: a = psymb; s :] -> final (kont (f a e) s)
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| [: :] -> e ]
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;
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value gen_fold1sep final f e entry symbl psymb psep =
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let failed =
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fun
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[ [symb; sep] -> Grammar.symb_failed_txt entry sep symb
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| _ -> "failed" ]
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in
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let parse_top =
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fun
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[ [symb; _] -> Grammar.parse_top_symb entry symb
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| _ -> raise Stream.Failure ]
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in
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let rec kont accu =
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parser
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[ [: v = psep;
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a =
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parser
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[ [: a = psymb :] -> a
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| [: a = parse_top symbl :] -> Obj.magic a
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| [: :] -> raise (Stream.Error (failed symbl)) ];
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s :] ->
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kont (f a accu) s
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| [: :] -> accu ]
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in
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parser [: a = psymb; s :] -> final (kont (f a e) s)
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;
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value sfold0 f e = gen_fold0 (fun x -> x) f e;
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value sfold1 f e = gen_fold1 (fun x -> x) f e;
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value sfold0sep f e = gen_fold0sep (fun x -> x) f e;
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value sfold1sep f e = gen_fold1sep (fun x -> x) f e;
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value cons x y = [x :: y];
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value nil = [];
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value slist0 entry = gen_fold0 List.rev cons nil entry;
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value slist1 entry = gen_fold1 List.rev cons nil entry;
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value slist0sep entry = gen_fold0sep List.rev cons nil entry;
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value slist1sep entry = gen_fold1sep List.rev cons nil entry;
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value sopt entry symbl psymb =
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parser
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[ [: a = psymb :] -> Some a
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| [: :] -> None ]
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;
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