83 lines
2.8 KiB
OCaml
83 lines
2.8 KiB
OCaml
(****************************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* INRIA Rocquencourt *)
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(* *)
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(* Copyright 2006 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed under *)
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(* the terms of the GNU Library General Public License, with the special *)
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(* exception on linking described in LICENSE at the top of the Objective *)
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(* Caml source tree. *)
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(* *)
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(****************************************************************************)
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(* Authors:
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* - Daniel de Rauglaudre: initial version
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* - Nicolas Pouillard: refactoring
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*)
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module type S = sig
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module Token : Sig.Token.S;
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open Token;
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type t = 'abstract;
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value mk : Stream.t (Token.t * Loc.t) -> t;
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value loc_bp : t -> Loc.t;
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value loc_ep : t -> Loc.t;
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value stream : t -> Stream.t (Token.t * Loc.t);
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value peek_nth : t -> int -> option (Token.t * Loc.t);
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value njunk : t -> int -> unit;
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value junk : Stream.t (Token.t * Loc.t) -> unit;
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value bp : Stream.t (Token.t * Loc.t) -> Loc.t;
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end;
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module Make (Token : Sig.Token.S) : S with module Token = Token = struct
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module Token = Token;
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open Token;
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type t = { strm : mutable Stream.t (Token.t * Loc.t);
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loc : mutable Loc.t };
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value loc_bp c =
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match Stream.peek c.strm with
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[ None -> Loc.ghost
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| Some (_, loc) -> loc ];
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value loc_ep c = c.loc;
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value set_loc c =
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match Stream.peek c.strm with
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[ Some (_, loc) -> c.loc := loc
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| None -> () ];
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value mk strm =
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match Stream.peek strm with
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[ Some (_, loc) -> { strm = strm; loc = loc }
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| None -> { strm = strm ; loc = Loc.ghost } ];
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value stream c = c.strm;
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value peek_nth c n =
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let list = Stream.npeek n c.strm in
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let rec loop list n =
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match (list, n) with
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[ ([((_, loc) as x) :: _], 1) -> do { c.loc := loc; Some x }
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| ([_ :: l], n) -> loop l (n - 1)
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| ([], _) -> None ]
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in
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loop list n;
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value njunk c n =
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do { for i = 1 to n do { Stream.junk c.strm };
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set_loc c };
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value streams = ref [];
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value mk strm =
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let c = mk strm in
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let () = streams.val := [(strm, c) :: streams.val] in c;
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value junk strm =
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do { set_loc (List.assq strm streams.val); Stream.junk strm };
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value bp strm = loc_bp (List.assq strm streams.val);
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end;
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