(* Title: HOL/Tools/refute_isar.ML
Author: Tjark Weber
Copyright 2003-2007
Outer syntax commands 'refute' and 'refute_params'.
*)
structure Refute_Isar: sig end =
struct
(* argument parsing *)
(*optional list of arguments of the form [name1=value1, name2=value2, ...]*)
val scan_parm =
OuterParse.name
-- (Scan.optional (OuterParse.$$$ "=" |-- OuterParse.name) "true")
val scan_parms = Scan.optional
(OuterParse.$$$ "[" |-- OuterParse.list scan_parm --| OuterParse.$$$ "]") [];
(* 'refute' command *)
val _ =
OuterSyntax.improper_command "refute"
"try to find a model that refutes a given subgoal" OuterKeyword.diag
(scan_parms -- Scan.optional OuterParse.nat 1 >>
(fn (parms, i) =>
Toplevel.keep (fn state =>
let
val ctxt = Toplevel.context_of state;
val {goal = st, ...} = Proof.raw_goal (Toplevel.proof_of state);
in Refute.refute_goal ctxt parms st i end)));
(* 'refute_params' command *)
val _ =
OuterSyntax.command "refute_params"
"show/store default parameters for the 'refute' command" OuterKeyword.thy_decl
(scan_parms >> (fn parms =>
Toplevel.theory (fn thy =>
let
val thy' = fold Refute.set_default_param parms thy;
val output =
(case Refute.get_default_params thy' of
[] => "none"
| new_defaults => cat_lines (map (fn (x, y) => x ^ "=" ^ y) new_defaults));
val _ = writeln ("Default parameters for 'refute':\n" ^ output);
in thy' end)));
end;