1 (* Copyright (C) 2004, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://helm.cs.unibo.it/
26 exception AssertFailure of string
27 exception MetaSubstFailure of string
29 (* The entry (i,t) in a substitution means that *)
30 (* (META i) have been instantiated with t. *)
31 type substitution = (int * Cic.term) list
33 (* apply_subst subst t *)
34 (* applies the substitution [subst] to [t] *)
35 (* [subst] must be already unwinded *)
36 val apply_subst : substitution -> Cic.term -> Cic.term
38 (* apply_subst_reducing subst (Some (mtr,reductions_no)) t *)
39 (* performs as (apply_subst subst t) until it finds an application of *)
40 (* (META [mtr]) that, once unwinding is performed, creates a new *)
41 (* beta-redex; in this case up to [reductions_no] consecutive *)
42 (* beta-reductions are performed. *)
43 (* Hint: this function is usually called when [reductions_no] *)
44 (* eta-expansions have been performed and the head of the new *)
45 (* application has been unified with (META [meta_to_reduce]): *)
46 (* during the unwinding the eta-expansions are undone. *)
47 (* [subst] must be already unwinded *)
48 val apply_subst_reducing :
49 (int * int) option -> substitution -> Cic.term -> Cic.term
51 val apply_subst_context : substitution -> Cic.context -> Cic.context
52 val apply_subst_metasenv: substitution -> Cic.metasenv -> Cic.metasenv
54 (** {2 Pretty printers} *)
56 val ppsubst: substitution -> string
57 val ppterm: substitution -> Cic.term -> string
58 val ppcontext: ?sep: string -> substitution -> Cic.context -> string
59 val ppterm_in_context:
60 substitution -> Cic.term -> (Cic.name option) list -> string
61 val ppmetasenv: ?sep: string -> Cic.metasenv -> substitution -> string
63 (* {2 Kernel wrappers}
64 * From now on we recreate a kernel abstraction where substitutions are part of
67 val lift : substitution -> int -> Cic.term -> Cic.term
68 val subst: substitution -> Cic.term -> Cic.term -> Cic.term
69 val whd: substitution -> Cic.context -> Cic.term -> Cic.term
70 val are_convertible: substitution -> Cic.context -> Cic.term -> Cic.term -> bool
73 Cic.metasenv -> substitution -> Cic.context -> Cic.term -> Cic.term
75 val tempi_type_of_aux : float ref
76 val tempi_type_of_aux_subst : float ref
81 int -> substitution -> Cic.context -> Cic.metasenv ->
82 (Cic.term option) list -> Cic.term ->
83 Cic.term * Cic.metasenv * substitution
85 (** {2 Format-like pretty printers}
86 * As above with prototypes suitable for toplevel/ocamldebug printers. No
87 * subsitutions are applied here since such printers are required to be invoked
88 * with only one argument.
91 val fppsubst: Format.formatter -> substitution -> unit
92 val fppterm: Format.formatter -> Cic.term -> unit
93 val fppmetasenv: Format.formatter -> Cic.metasenv -> unit