(* Title: Pure/Isar/instance.ML
ID: $Id$
Author: Florian Haftmann, TU Muenchen
A primitive instance command, based on instantiation target.
*)
signature INSTANCE =
sig
val instantiation_cmd: xstring list * sort * xstring -> theory -> local_theory
val instance_cmd: xstring * sort * xstring -> ((bstring * Attrib.src list) * xstring) list
-> theory -> Proof.state
end;
structure Instance : INSTANCE =
struct
fun read_single_arity thy (raw_tyco, raw_sorts, raw_sort) =
let
val (tyco, sorts, sort) = Sign.read_arity thy (raw_tyco, raw_sorts, raw_sort);
val vs = Name.names Name.context Name.aT sorts;
in (tyco, vs, sort) end;
fun read_multi_arity thy (raw_tycos, raw_sorts, raw_sort) =
let
val all_arities = map (fn raw_tyco => Sign.read_arity thy
(raw_tyco, raw_sorts, raw_sort)) raw_tycos;
val tycos = map #1 all_arities;
val (_, sorts, sort) = hd all_arities;
val vs = Name.names Name.context Name.aT sorts;
in (tycos, vs, sort) end;
fun instantiation_cmd raw_arities thy =
TheoryTarget.instantiation (read_multi_arity thy raw_arities) thy;
fun instance_cmd raw_arities defs thy =
let
val (tyco, vs, sort) = read_single_arity thy raw_arities;
fun mk_def ctxt ((name, raw_attr), raw_t) =
let
val attr = map (Attrib.intern_src thy) raw_attr;
val t = Syntax.parse_prop ctxt raw_t;
in (NONE, ((name, attr), t)) end;
fun define def ctxt =
let
val def' = (apsnd o apsnd) (Syntax.check_prop ctxt) def;
in Specification.definition def' ctxt end;
val _ = if not (null defs) then Output.legacy_feature
"Instance command with attached definitions; use instantiation instead." else ();
in if not (null defs) orelse forall (Class.is_class thy) sort
then
thy
|> TheoryTarget.instantiation ([tyco], vs, sort)
|> `(fn ctxt => map (mk_def ctxt) defs)
|-> (fn defs => fold_map Specification.definition defs)
|> snd
|> LocalTheory.reinit
|> Class.instantiation_instance Class.conclude_instantiation
else
thy
|> Class.instance_arity I (tyco, map snd vs, sort)
end;
end;