src/Pure/Isar/specification.ML

moved pretty_consts to proof_display.ML;
adapted to improved LocalTheory interfaces;

(*  Title:      Pure/Isar/specification.ML
    ID:         $Id$
    Author:     Makarius

Common local_theory specifications --- with type-inference and
toplevel polymorphism.
*)

signature SPECIFICATION =
sig
  val quiet_mode: bool ref
  val print_consts: local_theory -> (string * typ -> bool) -> (string * typ) list -> unit
  val read_specification: (string * string option * mixfix) list ->
    ((string * Attrib.src list) * string list) list -> local_theory ->
    (((string * typ) * mixfix) list * ((string * Attrib.src list) * term list) list) *
    local_theory
  val cert_specification: (string * typ option * mixfix) list ->
    ((string * Attrib.src list) * term list) list -> local_theory ->
    (((string * typ) * mixfix) list * ((string * Attrib.src list) * term list) list) *
    local_theory
  val axiomatization: (string * string option * mixfix) list ->
    ((bstring * Attrib.src list) * string list) list -> local_theory ->
    (term list * (bstring * thm list) list) * local_theory
  val axiomatization_i: (string * typ option * mixfix) list ->
    ((bstring * Attrib.src list) * term list) list -> local_theory ->
    (term list * (bstring * thm list) list) * local_theory
  val definition:
    ((string * string option * mixfix) option * ((string * Attrib.src list) * string)) list ->
    local_theory -> (term * (bstring * thm)) list * local_theory
  val definition_i:
    ((string * typ option * mixfix) option * ((string * Attrib.src list) * term)) list ->
    local_theory -> (term * (bstring * thm)) list * local_theory
  val abbreviation: Syntax.mode -> ((string * string option * mixfix) option * string) list ->
    local_theory -> local_theory
  val abbreviation_i: Syntax.mode -> ((string * typ option * mixfix) option * term) list ->
    local_theory -> local_theory
  val const_syntax: Syntax.mode -> (xstring * mixfix) list -> local_theory -> local_theory
  val const_syntax_i: Syntax.mode -> (string * mixfix) list -> local_theory -> local_theory
end;

structure Specification: SPECIFICATION =
struct

(* diagnostics *)

val quiet_mode = ref false;

fun print_consts _ _ [] = ()
  | print_consts ctxt pred cs =
      if ! quiet_mode then () else Pretty.writeln (ProofDisplay.pretty_consts ctxt pred cs);


(* prepare specification *)

fun prep_specification prep_vars prep_propp prep_att raw_vars raw_specs ctxt =
  let
    val thy = ProofContext.theory_of ctxt;

    val (vars, vars_ctxt) = ctxt |> prep_vars raw_vars;
    val (xs, params_ctxt) = vars_ctxt |> ProofContext.add_fixes_i vars;
    val ((specs, vs), specs_ctxt) =
      prep_propp (params_ctxt, map (map (rpair []) o snd) raw_specs)
      |> swap |>> map (map fst)
      ||>> fold_map ProofContext.inferred_param xs;

    val params = vs ~~ map #3 vars;
    val names = map (fst o fst) raw_specs;
    val atts = map (map (prep_att thy) o snd o fst) raw_specs;
  in ((params, (names ~~ atts) ~~ specs), specs_ctxt) end;

fun read_specification x =
  prep_specification ProofContext.read_vars ProofContext.read_propp Attrib.intern_src x;
fun cert_specification x =
  prep_specification ProofContext.cert_vars ProofContext.cert_propp (K I) x;


(* axiomatization *)

fun gen_axioms prep raw_vars raw_specs lthy =
  let
    val (vars, specs) = fst (prep raw_vars raw_specs lthy);
    val cs = map fst vars;
    val spec_frees = member (op =) (fold (fold Term.add_frees o snd) specs []);

    val ((consts, axioms), lthy') = lthy
      |> LocalTheory.consts spec_frees vars
      ||>> LocalTheory.axioms specs;

    (* FIXME generic target!? *)
    val hs = map (Term.head_of o #2 o Logic.dest_equals o Thm.prop_of o #2) consts;
    val lthy'' = lthy' |> LocalTheory.theory (Theory.add_finals_i false hs);

    val _ = print_consts lthy' spec_frees cs;
  in ((map #1 consts, axioms), lthy'') end;

val axiomatization = gen_axioms read_specification;
val axiomatization_i = gen_axioms cert_specification;


(* definition *)

fun gen_defs prep args lthy =
  let
    fun define (raw_var, (raw_a, raw_prop)) lthy1 =
      let
        val (vars, [((raw_name, atts), [prop])]) =
          fst (prep (the_list raw_var) [(raw_a, [raw_prop])] lthy1);
        val (((x, T), rhs), prove) = LocalDefs.derived_def lthy1 true prop;
        val name = Thm.def_name_optional x raw_name;
        val mx = (case vars of [] => NoSyn | [((x', _), mx)] =>
          if x = x' then mx
          else error ("Head of definition " ^ quote x ^ " differs from declaration " ^ quote x'));
        val ((lhs, (_, th)), lthy2) = lthy1
(*          |> LocalTheory.def ((x, mx), ((name ^ "_raw", []), rhs));  FIXME *)
          |> LocalTheory.def ((x, mx), ((name, []), rhs));
        val ((b, [th']), lthy3) = lthy2
          |> LocalTheory.note ((name, atts), [prove lthy2 lhs th]);
      in (((x, T), (lhs, (b, th'))), LocalTheory.reinit lthy3) end;

    val ((cs, defs), lthy') = lthy |> fold_map define args |>> split_list;
    val def_frees = member (op =) (fold (Term.add_frees o fst) defs []);
    val _ = print_consts lthy' def_frees cs;
  in (defs, lthy') end;

val definition = gen_defs read_specification;
val definition_i = gen_defs cert_specification;


(* abbreviation *)

fun gen_abbrevs prep mode args lthy =
  let
    fun abbrev (raw_var, raw_prop) lthy1 =
      let
        val ((vars, [(_, [prop])]), _) =
          prep (the_list raw_var) [(("", []), [raw_prop])]
            (lthy1 |> ProofContext.expand_abbrevs false);
        val ((x, T), rhs) = LocalDefs.abs_def (#2 (LocalDefs.cert_def lthy1 prop));
        val mx = (case vars of [] => NoSyn | [((x', _), mx)] =>
          if x = x' then mx
          else error ("Head of abbreviation " ^ quote x ^ " differs from declaration " ^ quote x'));
      in
        lthy1
        |> LocalTheory.abbrevs mode [((x, mx), rhs)]
        |> pair (x, T)
      end;

    val (cs, lthy1) = lthy
      |> ProofContext.set_syntax_mode mode
      |> fold_map abbrev args
      ||> ProofContext.restore_syntax_mode lthy;
    val _ = print_consts lthy1 (K false) cs;
  in lthy1 end;

val abbreviation = gen_abbrevs read_specification;
val abbreviation_i = gen_abbrevs cert_specification;


(* const syntax *)

fun gen_syntax intern_const mode raw_args lthy =
  let val args = raw_args |> map (apfst (intern_const (ProofContext.consts_of lthy)))
  in lthy |> LocalTheory.const_syntax mode args end;

val const_syntax = gen_syntax Consts.intern;
val const_syntax_i = gen_syntax (K I);

end;