1 (* Title: ../contextC.sml
2 Author: Walther Neuper, Mathias Lehnfeld
3 (c) due to copyright terms
5 (* Extension to Isabelle's naming conventions: "C" indicates Isac add-ons to an Isabelle module *)
8 val empty : Proof.context
9 val is_empty : Proof.context -> bool
10 val isac_ctxt : 'a -> Proof.context
11 val declare_constraints: term -> Proof.context -> Proof.context
12 val add_constraints: term list -> Proof.context -> Proof.context
13 val initialise : string -> term list -> Proof.context
14 val initialise' : theory -> string list -> Proof.context
15 val get_assumptions : Proof.context -> term list
16 val insert_assumptions : term list -> Proof.context -> Proof.context
17 val avoid_contradict: term -> term list -> term * term list
18 val subpbl_to_caller : Proof.context -> term -> Proof.context -> term * Proof.context
19 (*val subpbl_to_caller .. rename according to naming convention TODO*)
20 (* ---- for tests only: shifted from below to remove the Warning "unused" at fun.def. --------- *)
22 (*/-------------------------------------------------------- ! aktivate for Test_Isac BEGIN ---\* )
23 val transfer_asms_from_to : Proof.context -> Proof.context -> Proof.context
24 val contradict : term list -> term -> bool
25 val insert_assumptions_cao : Proof.context -> term list -> Proof.context
26 ( *\--- ! aktivate for Test_Isac END ----------------------------------------------------------/*)
29 structure ContextC(**) : CONTEXT_C(**) =
32 val empty = Proof_Context.init_global @{theory "Pure"};
33 (* ATTENTION: does _not_ recognise Variable.declare_constraints, etc...*)
34 fun is_empty ctxt = Context.eq_thy (Proof_Context.theory_of ctxt, @{theory "Pure"});
35 fun isac_ctxt xxx = Proof_Context.init_global (ThyC.Isac xxx)
37 val declare_constraints = Variable.declare_constraints
38 fun add_constraints ts ctxt =
39 fold Variable.declare_constraints (TermC.vars' ts) ctxt
41 (* in Subproblem take respective actual arguments from program *)
42 fun initialise thy' ts =
44 val ctxt = ThyC.get_theory thy' |> Proof_Context.init_global
45 val frees = TermC.vars' ts
46 val _ = TermC.raise_type_conflicts frees
48 fold Variable.declare_constraints frees ctxt
50 (* in root-problem take respective formalisation *)
51 fun initialise' thy fmz =
53 val ctxt = thy |> Proof_Context.init_global
54 val frees = map (TermC.parseNEW' ctxt) fmz |> TermC.vars'
55 val _ = TermC.raise_type_conflicts frees
57 fold Variable.declare_constraints frees ctxt
60 structure Context_Data = Proof_Data (type T = term list fun init _ = []);
61 fun get_assumptions ctxt = Context_Data.get ctxt
62 fun insert_assumptions asms = Context_Data.map (fn xs => distinct op = (asms @ xs))
65 transfer assumptions from one to another ctxt.
66 does NOT respect scope: in a calculation identifiers are unique.
67 but environments are scoped as usual in Luacs-interpretation.
69 fun transfer_asms_from_to from_ctxt to_ctxt =
71 val to_vars = get_assumptions to_ctxt |> map TermC.vars |> flat
72 fun transfer [] to_ctxt = to_ctxt
73 | transfer (from_asm :: fas) to_ctxt =
74 if inter op = (TermC.vars from_asm) to_vars = []
75 then transfer fas to_ctxt
76 else transfer fas (insert_assumptions [from_asm] to_ctxt)
77 in transfer (get_assumptions from_ctxt) to_ctxt end
79 (* there is still much TODO: factorise polynomials, etc *)
80 fun contradict asm res = fold (curry or_) (map (fn p => TermC.negates res p) asm) false;
83 Check a term for contradiction with a predicate list.
84 This makes only sense for types bool and bool list. In these cases return
85 the probably updated term together with
86 a respective list of non-contradicting predicates
88 fun avoid_contradict t preds =
89 if TermC.is_bool_list t then
91 val no_contra = t |> TermC.dest_list' |> filter_out (contradict preds)
92 in (no_contra |> TermC.list2isalist HOLogic.boolT, no_contra)
94 else if Term.type_of t = HOLogic.boolT then
95 if contradict preds t then (@{term bool_undef}, []) else (t, [t])
96 else (t (* type_of t \<noteq> bool *), [(* no predicate to add *)])
98 (* for Canonical Argument Order used by |> below *)
99 fun insert_assumptions_cao ctxt tms = insert_assumptions tms ctxt
101 fun subpbl_to_caller sub_ctxt prog_res caller_ctxt = caller_ctxt
103 |> avoid_contradict prog_res
104 |> apsnd (insert_assumptions_cao caller_ctxt)
105 |> apsnd (transfer_asms_from_to sub_ctxt)