aboutsummaryrefslogtreecommitdiffhomepage
path: root/library/keys.ml
blob: 057dc3b65dfe45c15059f95c6e71ec6e91d20c56 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016     *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
(************************************************************************)

(** Keys for unification and indexing *)

open Globnames
open Term
open Libobject

type key =
  | KGlob of global_reference
  | KLam
  | KLet
  | KProd
  | KSort
  | KCase
  | KFix
  | KCoFix
  | KRel

module KeyOrdered = struct
  type t = key

  let hash gr =
    match gr with
    | KGlob gr -> 8 + RefOrdered.hash gr
    | KLam -> 0
    | KLet -> 1
    | KProd -> 2
    | KSort -> 3
    | KCase -> 4
    | KFix -> 5
    | KCoFix -> 6
    | KRel -> 7

  let compare gr1 gr2 =
    match gr1, gr2 with
    | KGlob gr1, KGlob gr2 -> RefOrdered.compare gr1 gr2
    | _, KGlob _ -> -1
    | KGlob _, _ -> 1
    | k, k' -> Int.compare (hash k) (hash k')
    
  let equal k1 k2 =
    match k1, k2 with
    | KGlob gr1, KGlob gr2 -> RefOrdered.equal gr1 gr2
    | _, KGlob _ -> false
    | KGlob _, _ -> false
    | k, k' -> k == k'
end

module Keymap = HMap.Make(KeyOrdered)
module Keyset = Keymap.Set

(* Mapping structure for references to be considered equivalent *)

let keys = Summary.ref Keymap.empty ~name:"Keys_decl"

let add_kv k v m =
  try Keymap.modify k (fun k' vs -> Keyset.add v vs) m
  with Not_found -> Keymap.add k (Keyset.singleton v) m

let add_keys k v = 
  keys := add_kv k v (add_kv v k !keys)

let equiv_keys k k' =
  k == k' || KeyOrdered.equal k k' ||
    try Keyset.mem k' (Keymap.find k !keys)
    with Not_found -> false

(** Registration of keys as an object *)

let load_keys _ (_,(ref,ref')) =
  add_keys ref ref'

let cache_keys o =
  load_keys 1 o

let subst_key subst k = 
  match k with
  | KGlob gr -> KGlob (subst_global_reference subst gr)
  | _ -> k

let subst_keys (subst,(k,k')) =
  (subst_key subst k, subst_key subst k')

let discharge_key = function
  | KGlob g when Lib.is_in_section g ->
    if isVarRef g then None else Some (KGlob (pop_global_reference g))
  | x -> Some x

let discharge_keys (_,(k,k')) =
  match discharge_key k, discharge_key k' with 
  | Some x, Some y -> Some (x, y)
  | _ -> None

let rebuild_keys (ref,ref') = (ref, ref')

type key_obj = key * key

let inKeys : key_obj -> obj =
  declare_object {(default_object "KEYS") with
    cache_function = cache_keys;
    load_function = load_keys;
    subst_function = subst_keys;
    classify_function = (fun x -> Substitute x);
    discharge_function = discharge_keys;
    rebuild_function = rebuild_keys }

let declare_equiv_keys ref ref' =
  Lib.add_anonymous_leaf (inKeys (ref,ref'))

let constr_key c =
  let open Globnames in 
  try 
    let rec aux k = 
      match kind_of_term k with
      | Const (c, _) -> KGlob (ConstRef c)
      | Ind (i, u) -> KGlob (IndRef i)
      | Construct (c,u) -> KGlob (ConstructRef c)
      | Var id -> KGlob (VarRef id)
      | App (f, _) -> aux f
      | Proj (p, _) -> KGlob (ConstRef (Names.Projection.constant p))
      | Cast (p, _, _) -> aux p
      | Lambda _ -> KLam 
      | Prod _ -> KProd
      | Case _ -> KCase
      | Fix _ -> KFix
      | CoFix _ -> KCoFix
      | Rel _ -> KRel
      | Meta _ -> raise Not_found
      | Evar _ -> raise Not_found
      | Sort _ -> KSort 
      | LetIn _ -> KLet
    in Some (aux c)
  with Not_found -> None

open Pp

let pr_key pr_global = function
  | KGlob gr -> pr_global gr
  | KLam -> str"Lambda"
  | KLet -> str"Let"
  | KProd -> str"Product"
  | KSort -> str"Sort"
  | KCase -> str"Case"
  | KFix -> str"Fix"
  | KCoFix -> str"CoFix"
  | KRel -> str"Rel"

let pr_keyset pr_global v = 
  prlist_with_sep spc (pr_key pr_global) (Keyset.elements v)

let pr_mapping pr_global k v = 
  pr_key pr_global k ++ str" <-> " ++ pr_keyset pr_global v

let pr_keys pr_global =
  Keymap.fold (fun k v acc -> pr_mapping pr_global k v ++ fnl () ++ acc) !keys (mt())