1 (* Title: HOL/Tools/ATP/atp_problem.ML
2 Author: Jia Meng, Cambridge University Computer Laboratory and NICTA
3 Author: Jasmin Blanchette, TU Muenchen
5 Abstract representation of ATP problems and TPTP syntax.
8 signature ATP_PROBLEM =
10 datatype 'a fo_term = ATerm of 'a * 'a fo_term list
11 datatype quantifier = AForall | AExists
12 datatype connective = ANot | AAnd | AOr | AImplies | AIf | AIff | ANotIff
13 datatype ('a, 'b) formula =
14 AQuant of quantifier * 'a list * ('a, 'b) formula |
15 AConn of connective * ('a, 'b) formula list |
17 type 'a uniform_formula = ('a, 'a fo_term) formula
19 datatype kind = Axiom | Definition | Lemma | Hypothesis | Conjecture
20 datatype 'a problem_line =
21 Fof of string * kind * ('a, 'a fo_term) formula * string fo_term option
22 type 'a problem = (string * 'a problem_line list) list
24 val timestamp : unit -> string
25 val is_atp_variable : string -> bool
26 val tptp_strings_for_atp_problem :
27 bool -> (string * string problem_line list) list -> string list
28 val nice_atp_problem :
29 bool -> ('a * (string * string) problem_line list) list
30 -> ('a * string problem_line list) list
31 * (string Symtab.table * string Symtab.table) option
34 structure ATP_Problem : ATP_PROBLEM =
39 datatype 'a fo_term = ATerm of 'a * 'a fo_term list
40 datatype quantifier = AForall | AExists
41 datatype connective = ANot | AAnd | AOr | AImplies | AIf | AIff | ANotIff
42 datatype ('a, 'b) formula =
43 AQuant of quantifier * 'a list * ('a, 'b) formula |
44 AConn of connective * ('a, 'b) formula list |
46 type 'a uniform_formula = ('a, 'a fo_term) formula
48 datatype kind = Axiom | Definition | Lemma | Hypothesis | Conjecture
49 datatype 'a problem_line =
50 Fof of string * kind * ('a, 'a fo_term) formula * string fo_term option
51 type 'a problem = (string * 'a problem_line list) list
53 val timestamp = Date.fmt "%Y-%m-%d %H:%M:%S" o Date.fromTimeLocal o Time.now
55 fun string_for_kind Axiom = "axiom"
56 | string_for_kind Definition = "definition"
57 | string_for_kind Lemma = "lemma"
58 | string_for_kind Hypothesis = "hypothesis"
59 | string_for_kind Conjecture = "conjecture"
61 fun string_for_term (ATerm (s, [])) = s
62 | string_for_term (ATerm ("equal", ts)) =
63 space_implode " = " (map string_for_term ts)
64 | string_for_term (ATerm ("[]", ts)) =
65 (* used for lists in the optional "source" field of a derivation *)
66 "[" ^ commas (map string_for_term ts) ^ "]"
67 | string_for_term (ATerm (s, ts)) =
68 s ^ "(" ^ commas (map string_for_term ts) ^ ")"
69 fun string_for_quantifier AForall = "!"
70 | string_for_quantifier AExists = "?"
71 fun string_for_connective ANot = "~"
72 | string_for_connective AAnd = "&"
73 | string_for_connective AOr = "|"
74 | string_for_connective AImplies = "=>"
75 | string_for_connective AIf = "<="
76 | string_for_connective AIff = "<=>"
77 | string_for_connective ANotIff = "<~>"
78 fun string_for_formula (AQuant (q, xs, phi)) =
79 "(" ^ string_for_quantifier q ^ "[" ^ commas xs ^ "] : " ^
80 string_for_formula phi ^ ")"
81 | string_for_formula (AConn (ANot, [AAtom (ATerm ("equal", ts))])) =
82 space_implode " != " (map string_for_term ts)
83 | string_for_formula (AConn (c, [phi])) =
84 "(" ^ string_for_connective c ^ " " ^ string_for_formula phi ^ ")"
85 | string_for_formula (AConn (c, phis)) =
86 "(" ^ space_implode (" " ^ string_for_connective c ^ " ")
87 (map string_for_formula phis) ^ ")"
88 | string_for_formula (AAtom tm) = string_for_term tm
90 fun string_for_problem_line use_conjecture_for_hypotheses
91 (Fof (ident, kind, phi, source)) =
94 if kind = Hypothesis andalso use_conjecture_for_hypotheses then
95 (Conjecture, AConn (ANot, [phi]))
99 "fof(" ^ ident ^ ", " ^ string_for_kind kind ^ ",\n (" ^
100 string_for_formula phi ^ ")" ^
102 SOME tm => ", " ^ string_for_term tm
103 | NONE => "") ^ ").\n"
105 fun tptp_strings_for_atp_problem use_conjecture_for_hypotheses problem =
106 "% This file was generated by Isabelle (most likely Sledgehammer)\n\
107 \% " ^ timestamp () ^ "\n" ::
108 maps (fn (_, []) => []
109 | (heading, lines) =>
110 "\n% " ^ heading ^ " (" ^ string_of_int (length lines) ^ ")\n" ::
111 map (string_for_problem_line use_conjecture_for_hypotheses) lines)
114 fun is_atp_variable s = Char.isUpper (String.sub (s, 0))
119 fun empty_name_pool readable_names =
120 if readable_names then SOME (Symtab.empty, Symtab.empty) else NONE
122 fun pool_fold f xs z = pair z #> fold_rev (fn x => uncurry (f x)) xs
124 pool_fold (fn x => fn ys => fn pool => f x pool |>> (fn y => y :: ys)) xs []
129 | skip (#"." :: cs) = skip cs
130 | skip (c :: cs) = if Char.isAlphaNum c then skip cs else c :: keep cs
132 | keep (#"." :: cs) = skip cs
133 | keep (c :: cs) = c :: keep cs
134 in String.explode #> rev #> keep #> rev #> String.implode end
136 (* "op" is also reserved, to avoid the unreadable "op_1", "op_2", etc., in the
137 problem files. "equal" is reserved by some ATPs. "eq" is reserved to ensure
138 that "HOL.eq" is correctly mapped to equality. *)
139 val reserved_nice_names = ["op", "equal", "eq"]
140 fun readable_name full_name s =
141 if s = full_name then
145 val s = s |> no_qualifiers
146 |> Name.desymbolize (Char.isUpper (String.sub (full_name, 0)))
147 in if member (op =) reserved_nice_names s then full_name else s end
149 fun nice_name (full_name, _) NONE = (full_name, NONE)
150 | nice_name (full_name, desired_name) (SOME the_pool) =
151 if String.isPrefix "$" full_name then
152 (full_name, SOME the_pool)
153 else case Symtab.lookup (fst the_pool) full_name of
154 SOME nice_name => (nice_name, SOME the_pool)
157 val nice_prefix = readable_name full_name desired_name
160 val nice_name = nice_prefix ^
161 (if j = 0 then "" else "_" ^ string_of_int j)
163 case Symtab.lookup (snd the_pool) nice_name of
165 if full_name = full_name' then (nice_name, the_pool)
169 (Symtab.update_new (full_name, nice_name) (fst the_pool),
170 Symtab.update_new (nice_name, full_name) (snd the_pool)))
172 in add 0 |> apsnd SOME end
174 fun nice_term (ATerm (name, ts)) =
175 nice_name name ##>> pool_map nice_term ts #>> ATerm
176 fun nice_formula (AQuant (q, xs, phi)) =
177 pool_map nice_name xs ##>> nice_formula phi
178 #>> (fn (xs, phi) => AQuant (q, xs, phi))
179 | nice_formula (AConn (c, phis)) =
180 pool_map nice_formula phis #>> curry AConn c
181 | nice_formula (AAtom tm) = nice_term tm #>> AAtom
182 fun nice_problem_line (Fof (ident, kind, phi, source)) =
183 nice_formula phi #>> (fn phi => Fof (ident, kind, phi, source))
184 fun nice_problem problem =
185 pool_map (fn (heading, lines) =>
186 pool_map nice_problem_line lines #>> pair heading) problem
187 fun nice_atp_problem readable_names problem =
188 nice_problem problem (empty_name_pool readable_names)