50 lines
2.0 KiB
OCaml
50 lines
2.0 KiB
OCaml
(**************************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. *)
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(* *)
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(* All rights reserved. This file is distributed under the terms of *)
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(* the GNU Lesser General Public License version 2.1, with the *)
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(* special exception on linking described in the file LICENSE. *)
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(* *)
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(**************************************************************************)
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type t =
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Lident of string
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| Ldot of t * string
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| Lapply of t * t
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let rec flat accu = function
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Lident s -> s :: accu
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| Ldot(lid, s) -> flat (s :: accu) lid
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| Lapply(_, _) -> Misc.fatal_error "Longident.flat"
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let flatten lid = flat [] lid
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let last = function
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Lident s -> s
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| Ldot(_, s) -> s
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| Lapply(_, _) -> Misc.fatal_error "Longident.last"
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let rec split_at_dots s pos =
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try
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let dot = String.index_from s pos '.' in
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String.sub s pos (dot - pos) :: split_at_dots s (dot + 1)
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with Not_found ->
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[String.sub s pos (String.length s - pos)]
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let unflatten l =
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match l with
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| [] -> None
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| hd :: tl -> Some (List.fold_left (fun p s -> Ldot(p, s)) (Lident hd) tl)
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let parse s =
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match unflatten (split_at_dots s 0) with
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| None -> Lident "" (* should not happen, but don't put assert false
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so as not to crash the toplevel (see Genprintval) *)
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| Some v -> v
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