src/Pure/sign.ML
author wenzelm
Thu May 19 16:20:52 1994 +0200 (1994-05-19)
changeset 386 e9ba9f7e2542
parent 277 4abe17e92130
child 402 16a8fe4f2250
permissions -rw-r--r--
added const_type: sg -> typ option;
stamps now stored in REVERSE order;
now supports 'draft signatures' and incremental extension: is_draft,
add_classes (supports axclasses), add_defsort, add_types, add_tyabbrs,
add_tyabbrs_i, add_arities, add_consts, add_consts_i, add_syntax,
add_syntax_i, add_trfuns, add_trrules, add_name, make_draft;
added const_of_class, class_of_const (for axclasses);
changed the pure signature to support axclasses (added itself, TYPE);
various major internal changes;
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(*  Title:      Pure/sign.ML
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    ID:         $Id$
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    Author:     Lawrence C Paulson and Markus Wenzel
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The abstract type "sg" of signatures.
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TODO:
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  pure sign: elim Syntax.constrainC
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*)
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signature SIGN =
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sig
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  structure Symtab: SYMTAB
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  structure Syntax: SYNTAX
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  structure Type: TYPE
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  sharing Symtab = Type.Symtab
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  local open Type Syntax Syntax.Mixfix in
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    type sg
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    val rep_sg: sg ->
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      {tsig: type_sig,
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       const_tab: typ Symtab.table,
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       syn: syntax,
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       stamps: string ref list}
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    val subsig: sg * sg -> bool
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    val eq_sg: sg * sg -> bool
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    val is_draft: sg -> bool
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    val const_type: sg -> string -> typ option
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    val print_sg: sg -> unit
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    val pprint_sg: sg -> pprint_args -> unit
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    val pretty_term: sg -> term -> Pretty.T
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    val pretty_typ: sg -> typ -> Pretty.T
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    val string_of_term: sg -> term -> string
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    val string_of_typ: sg -> typ -> string
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    val pprint_term: sg -> term -> pprint_args -> unit
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    val pprint_typ: sg -> typ -> pprint_args -> unit
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    val certify_typ: sg -> typ -> typ
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    val certify_term: sg -> term -> term * typ * int
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    val read_typ: sg * (indexname -> sort option) -> string -> typ
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    val add_classes: (class list * class * class list) list -> sg -> sg
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    val add_defsort: sort -> sg -> sg
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    val add_types: (string * int * mixfix) list -> sg -> sg
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    val add_tyabbrs: (string * string list * string * mixfix) list -> sg -> sg
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    val add_tyabbrs_i: (string * string list * typ * mixfix) list -> sg -> sg
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    val add_arities: (string * sort list * sort) list -> sg -> sg
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    val add_consts: (string * string * mixfix) list -> sg -> sg
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    val add_consts_i: (string * typ * mixfix) list -> sg -> sg
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    val add_syntax: (string * string * mixfix) list -> sg -> sg
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    val add_syntax_i: (string * typ * mixfix) list -> sg -> sg
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    val add_trfuns:
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      (string * (ast list -> ast)) list *
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      (string * (term list -> term)) list *
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      (string * (term list -> term)) list *
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      (string * (ast list -> ast)) list -> sg -> sg
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    val add_trrules: xrule list -> sg -> sg
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    val add_name: string -> sg -> sg
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    val make_draft: sg -> sg
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    val extend: sg -> string ->
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      (class * class list) list * class list *
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      (string list * int) list *
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      (string * string list * string) list *
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      (string list * (sort list * class)) list *
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      (string list * string) list * sext option -> sg
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    val merge: sg * sg -> sg
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    val pure: sg
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    val const_of_class: class -> string
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    val class_of_const: string -> class
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  end
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end;
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functor SignFun(structure Syntax: SYNTAX and Type: TYPE): SIGN =
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struct
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structure Symtab = Type.Symtab;
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structure Syntax = Syntax;
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structure BasicSyntax: BASIC_SYNTAX = Syntax;
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structure Pretty = Syntax.Pretty;
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structure Type = Type;
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open BasicSyntax Type;
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open Syntax.Mixfix;   (* FIXME *)
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(** datatype sg **)
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(*the "ref" in stamps ensures that no two signatures are identical -- it is
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  impossible to forge a signature*)
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datatype sg =
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  Sg of {
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    tsig: type_sig,                 (*order-sorted signature of types*)
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    const_tab: typ Symtab.table,    (*types of constants*)
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    syn: Syntax.syntax,             (*syntax for parsing and printing*)
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    stamps: string ref list};       (*unique theory indentifier*)
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fun rep_sg (Sg args) = args;
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fun is_draft (Sg {stamps = ref "#" :: _, ...}) = true
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  | is_draft _ = false;
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fun subsig (Sg {stamps = s1, ...}, Sg {stamps = s2, ...}) = s1 subset s2;
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fun eq_sg (Sg {stamps = s1, ...}, Sg {stamps = s2, ...}) = eq_set (s1, s2);
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fun const_type (Sg {const_tab, ...}) c =
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  Symtab.lookup (const_tab, c);
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(** print signature **)
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val stamp_names = rev o map !;
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fun print_sg sg =
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  let
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    fun prt_typ syn ty = Pretty.quote (Syntax.pretty_typ syn ty);
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    fun pretty_sort [cl] = Pretty.str cl
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      | pretty_sort cls = Pretty.str_list "{" "}" cls;
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    fun pretty_subclass (cl, cls) = Pretty.block
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      [Pretty.str (cl ^ " <"), Pretty.brk 1, pretty_sort cls];
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    fun pretty_default cls = Pretty.block
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      [Pretty.str "default:", Pretty.brk 1, pretty_sort cls];
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    fun pretty_arg (ty, n) = Pretty.str (ty ^ " " ^ string_of_int n);
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    fun pretty_abbr syn (ty, (vs, rhs)) = Pretty.block
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      [prt_typ syn (Type (ty, map (fn v => TVar (v, [])) vs)),
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        Pretty.str " =", Pretty.brk 1, prt_typ syn rhs];
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    fun pretty_arity ty (cl, []) = Pretty.block
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          [Pretty.str (ty ^ " ::"), Pretty.brk 1, Pretty.str cl]
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      | pretty_arity ty (cl, srts) = Pretty.block
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          [Pretty.str (ty ^ " ::"), Pretty.brk 1,
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            Pretty.list "(" ")" (map pretty_sort srts),
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            Pretty.brk 1, Pretty.str cl];
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    fun pretty_coreg (ty, ars) = map (pretty_arity ty) ars;
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    fun pretty_const syn (c, ty) = Pretty.block
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      [Pretty.str (quote c ^ " ::"), Pretty.brk 1, prt_typ syn ty];
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    val Sg {tsig, const_tab, syn, stamps} = sg;
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    val {classes, subclass, default, args, abbrs, coreg} = rep_tsig tsig;
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  in
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    Pretty.writeln (Pretty.strs ("stamps:" :: stamp_names stamps));
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    Pretty.writeln (Pretty.strs ("classes:" :: classes));
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    Pretty.writeln (Pretty.big_list "subclass:" (map pretty_subclass subclass));
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    Pretty.writeln (pretty_default default);
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    Pretty.writeln (Pretty.big_list "types:" (map pretty_arg args));
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    Pretty.writeln (Pretty.big_list "abbrs:" (map (pretty_abbr syn) abbrs));
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    Pretty.writeln (Pretty.big_list "coreg:" (flat (map pretty_coreg coreg)));
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    Pretty.writeln (Pretty.big_list "consts:"
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      (map (pretty_const syn) (Symtab.dest const_tab)))
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  end;
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fun pprint_sg (Sg {stamps, ...}) =
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  Pretty.pprint (Pretty.str_list "{" "}" (stamp_names stamps));
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(** pretty printing of terms and types **)
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fun pretty_term (Sg {syn, ...}) = Syntax.pretty_term syn;
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fun pretty_typ (Sg {syn, ...}) = Syntax.pretty_typ syn;
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fun string_of_term (Sg {syn, ...}) = Syntax.string_of_term syn;
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fun string_of_typ (Sg {syn, ...}) = Syntax.string_of_typ syn;
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fun pprint_term sg = Pretty.pprint o Pretty.quote o (pretty_term sg);
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fun pprint_typ sg = Pretty.pprint o Pretty.quote o (pretty_typ sg);
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(** certify types and terms **)   (*exception TYPE*)
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fun certify_typ (Sg {tsig, ...}) ty = cert_typ tsig ty;
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fun mapfilt_atoms f (Abs (_, _, t)) = mapfilt_atoms f t
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  | mapfilt_atoms f (t $ u) = mapfilt_atoms f t @ mapfilt_atoms f u
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  | mapfilt_atoms f a = (case f a of Some y => [y] | None => []);
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fun certify_term (sg as Sg {tsig, ...}) tm =
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  let
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    fun valid_const a T =
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      (case const_type sg a of
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        Some U => typ_instance (tsig, T, U)
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      | _ => false);
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    fun atom_err (Const (a, T)) =
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          if valid_const a T then None
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          else Some ("Illegal type for constant " ^ quote a ^ " :: " ^
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            quote (string_of_typ sg T))
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      | atom_err (Var ((x, i), _)) =
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          if i < 0 then Some ("Negative index for Var " ^ quote x) else None
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      | atom_err _ = None;
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    val norm_tm =
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      (case it_term_types (typ_errors tsig) (tm, []) of
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        [] => map_term_types (norm_typ tsig) tm
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      | errs => raise_type (cat_lines errs) [] [tm]);
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  in
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    (case mapfilt_atoms atom_err norm_tm of
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      [] => (norm_tm, type_of norm_tm, maxidx_of_term norm_tm)
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    | errs => raise_type (cat_lines errs) [] [norm_tm])
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  end;
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(** read types **)    (*exception ERROR*)
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(* FIXME rd_typ vs. read_raw_typ (?) *)
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fun rd_typ tsig syn sort_of s =
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  let
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    val def_sort = defaultS tsig;
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    val raw_ty =        (*this may raise ERROR, too!*)
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      Syntax.read_typ syn (fn x => if_none (sort_of x) def_sort) s;
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  in
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    cert_typ tsig raw_ty
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      handle TYPE (msg, _, _) => error msg
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  end
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  handle ERROR => error ("The error(s) above occurred in type " ^ quote s);
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fun read_typ (Sg {tsig, syn, ...}, sort_of) s = rd_typ tsig syn sort_of s;
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(** extend signature **)    (*exception ERROR*)
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(* FIXME -> type.ML *)
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(* FIXME replace? *)
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fun varify_typ (Type (t, tys)) = Type (t, map varify_typ tys)
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  | varify_typ (TFree (a, s)) = TVar ((a, 0), s)
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  | varify_typ (ty as TVar _) =
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      raise_type "Illegal schematic type variable" [ty] [];
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(* fake newstyle interfaces *) (* FIXME -> type.ML *)
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fun ext_tsig_classes tsig classes =
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  if exists (fn ([], _, _) => false | _ => true) classes then
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    sys_error "FIXME ext_tsig_classes"
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  else
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    extend_tsig tsig (map (fn (_, c, cs) => (c, cs)) classes, [], [], []);
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fun ext_tsig_defsort tsig defsort =
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  extend_tsig tsig ([], defsort, [], []);
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fun ext_tsig_types tsig types =
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  extend_tsig tsig ([], [], map (fn (t, n) => ([t], n)) types, []);
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(* FIXME varify_typ, rem_sorts; norm_typ (?) *)
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fun ext_tsig_abbrs tsig abbrs = Type.ext_tsig_abbrs tsig
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  (map (fn (t, vs, rhs) => (t, (map (rpair 0) vs, varifyT rhs))) abbrs);
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fun ext_tsig_arities tsig arities = extend_tsig tsig
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  ([], [], [], flat (map (fn (t, ss, cs) => map (fn c => ([t], (ss, c))) cs) arities));
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(** read types **)  (*exception ERROR*)
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fun err_in_type s =
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  error ("The error(s) above occurred in type " ^ quote s);
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fun read_raw_typ syn tsig sort_of str =
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  Syntax.read_typ syn (fn x => if_none (sort_of x) (defaultS tsig)) str
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    handle ERROR => err_in_type str;
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(*read and certify typ wrt a signature*)
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fun read_typ (Sg {tsig, syn, ...}, sort_of) str =
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  cert_typ tsig (read_raw_typ syn tsig sort_of str)
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    handle TYPE (msg, _, _) => (writeln msg; err_in_type str);
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(** extension functions **)  (*exception ERROR*)
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fun decls_of name_of mfixs =
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  map (fn (x, y, mx) => (name_of x mx, y)) mfixs;
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(* add default sort *)
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fun ext_defsort (syn, tsig, ctab) defsort =
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  (syn, ext_tsig_defsort tsig defsort, ctab);
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(* add type constructors *)
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fun ext_types (syn, tsig, ctab) types =
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  (Syntax.extend_type_gram syn types,
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    ext_tsig_types tsig (decls_of type_name types),
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    ctab);
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(* add type abbreviations *)
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fun read_abbr syn tsig (t, vs, rhs_src) =
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  (t, vs, read_raw_typ syn tsig (K None) rhs_src)
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    handle ERROR => error ("in type abbreviation " ^ t);
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fun ext_abbrs rd_abbr (syn, tsig, ctab) abbrs =
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  let
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    fun mfix_of (t, vs, _, mx) = (t, length vs, mx);
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    val syn1 = Syntax.extend_type_gram syn (map mfix_of abbrs);
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    fun decl_of (t, vs, rhs, mx) =
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      rd_abbr syn1 tsig (type_name t mx, vs, rhs);
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  in
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    (syn1, ext_tsig_abbrs tsig (map decl_of abbrs), ctab)
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  end;
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val ext_tyabbrs_i = ext_abbrs (K (K I));
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val ext_tyabbrs = ext_abbrs read_abbr;
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(* add type arities *)
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fun ext_arities (syn, tsig, ctab) arities =
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  let
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    val tsig1 = ext_tsig_arities tsig arities;
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    val log_types = logical_types tsig1;
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  in
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    (Syntax.extend_log_types syn log_types, tsig1, ctab)
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  end;
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(* add term constants and syntax *)
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fun err_in_const c =
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  error ("in declaration of constant " ^ quote c);
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fun err_dup_consts cs =
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  error ("Duplicate declaration of constant(s) " ^ commas_quote cs);
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fun read_const syn tsig (c, ty_src, mx) =
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  (c, read_raw_typ syn tsig (K None) ty_src, mx)
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    handle ERROR => err_in_const (const_name c mx);
wenzelm@386
   348
wenzelm@386
   349
fun ext_cnsts rd_const syn_only (syn, tsig, ctab) raw_consts =
wenzelm@386
   350
  let
wenzelm@386
   351
    fun prep_const (c, ty, mx) = (c, cert_typ tsig (varify_typ ty), mx)
wenzelm@386
   352
      handle TYPE (msg, _, _) => (writeln msg; err_in_const (const_name c mx));
wenzelm@386
   353
wenzelm@386
   354
    val consts = map (prep_const o rd_const syn tsig) raw_consts;
wenzelm@386
   355
    val decls =
wenzelm@386
   356
      if syn_only then []
wenzelm@386
   357
      else filter_out (equal "" o fst) (decls_of const_name consts);
wenzelm@386
   358
  in
wenzelm@386
   359
    (Syntax.extend_const_gram syn consts, tsig,
wenzelm@386
   360
      Symtab.extend_new (ctab, decls)
wenzelm@386
   361
        handle Symtab.DUPS cs => err_dup_consts cs)
wenzelm@386
   362
  end;
wenzelm@386
   363
wenzelm@386
   364
val ext_consts_i = ext_cnsts (K (K I)) false;
wenzelm@386
   365
val ext_consts = ext_cnsts read_const false;
wenzelm@386
   366
val ext_syntax_i = ext_cnsts (K (K I)) true;
wenzelm@386
   367
val ext_syntax = ext_cnsts read_const true;
wenzelm@386
   368
wenzelm@386
   369
wenzelm@386
   370
(* add type classes *)
wenzelm@386
   371
wenzelm@386
   372
fun const_of_class c = c ^ "_class";
wenzelm@386
   373
wenzelm@386
   374
fun class_of_const c_class =
wenzelm@386
   375
  let
wenzelm@386
   376
    val c = implode (take (size c_class - 6, explode c_class));
wenzelm@386
   377
  in
wenzelm@386
   378
    if const_of_class c = c_class then c
wenzelm@386
   379
    else raise_term ("class_of_const: bad name " ^ quote c_class) []
wenzelm@386
   380
  end;
wenzelm@386
   381
wenzelm@386
   382
wenzelm@386
   383
fun ext_classes (syn, tsig, ctab) classes =
wenzelm@386
   384
  let
wenzelm@386
   385
    val names = map (fn (_, c, _) => c) classes;
wenzelm@386
   386
    val consts =
wenzelm@386
   387
      map (fn c => (const_of_class c, a_itselfT --> propT, NoSyn)) names;
wenzelm@386
   388
  in
wenzelm@386
   389
    ext_consts_i
wenzelm@386
   390
      (Syntax.extend_consts syn names, ext_tsig_classes tsig classes, ctab)
wenzelm@386
   391
      consts
wenzelm@386
   392
  end;
wenzelm@386
   393
wenzelm@386
   394
wenzelm@386
   395
(* add syntactic translations *)
wenzelm@386
   396
wenzelm@386
   397
fun ext_trfuns (syn, tsig, ctab) trfuns =
wenzelm@386
   398
  (Syntax.extend_trfuns syn trfuns, tsig, ctab);
wenzelm@386
   399
wenzelm@386
   400
fun ext_trrules (syn, tsig, ctab) xrules =
wenzelm@386
   401
  (Syntax.extend_trrules syn xrules, tsig, ctab);
wenzelm@386
   402
wenzelm@386
   403
wenzelm@386
   404
(* build signature *)
wenzelm@386
   405
wenzelm@386
   406
(* FIXME debug *)
wenzelm@386
   407
fun assert_stamps_ok stamps =
wenzelm@386
   408
  let val names = map ! stamps;
wenzelm@386
   409
  in
wenzelm@386
   410
    if not (null (duplicates stamps)) then
wenzelm@386
   411
      error "DEBUG dup stamps"
wenzelm@386
   412
    else if not (null (duplicates names)) then
wenzelm@386
   413
      error "DEBUG dup stamp names"
wenzelm@386
   414
    else if not (null names) andalso exists (equal "#") (tl names) then
wenzelm@386
   415
      error "DEBUG misplaced draft stamp name"
wenzelm@386
   416
    else stamps
wenzelm@386
   417
  end;
wenzelm@386
   418
wenzelm@386
   419
fun ext_stamps stamps name =
wenzelm@386
   420
  let
wenzelm@386
   421
    val stmps = (case stamps of ref "#" :: ss => ss | ss => ss);
wenzelm@386
   422
  in
wenzelm@386
   423
    if exists (equal name o !) stmps then
wenzelm@386
   424
      error ("Theory already contains a " ^ quote name ^ " component")
wenzelm@386
   425
    else assert_stamps_ok (ref name :: stmps)
wenzelm@386
   426
  end;
wenzelm@386
   427
wenzelm@386
   428
wenzelm@386
   429
fun make_sign (syn, tsig, ctab) stamps name =
wenzelm@386
   430
  Sg {tsig = tsig, const_tab = ctab, syn = syn,
wenzelm@386
   431
    stamps = ext_stamps stamps name};
wenzelm@386
   432
wenzelm@386
   433
fun extend_sign extfun name decls (Sg {tsig, const_tab, syn, stamps}) =
wenzelm@386
   434
  make_sign (extfun (syn, tsig, const_tab) decls) stamps name;
wenzelm@386
   435
wenzelm@386
   436
wenzelm@386
   437
(* the external interfaces *)
wenzelm@386
   438
wenzelm@386
   439
val add_classes   = extend_sign ext_classes "#";
wenzelm@386
   440
val add_defsort   = extend_sign ext_defsort "#";
wenzelm@386
   441
val add_types     = extend_sign ext_types "#";
wenzelm@386
   442
val add_tyabbrs   = extend_sign ext_tyabbrs "#";
wenzelm@386
   443
val add_tyabbrs_i = extend_sign ext_tyabbrs_i "#";
wenzelm@386
   444
val add_arities   = extend_sign ext_arities "#";
wenzelm@386
   445
val add_consts    = extend_sign ext_consts "#";
wenzelm@386
   446
val add_consts_i  = extend_sign ext_consts_i "#";
wenzelm@386
   447
val add_syntax    = extend_sign ext_syntax "#";
wenzelm@386
   448
val add_syntax_i  = extend_sign ext_syntax_i "#";
wenzelm@386
   449
val add_trfuns    = extend_sign ext_trfuns "#";
wenzelm@386
   450
val add_trrules   = extend_sign ext_trrules "#";
wenzelm@386
   451
wenzelm@386
   452
fun add_name name sg = extend_sign K name () sg;
wenzelm@386
   453
val make_draft = add_name "#";
wenzelm@386
   454
wenzelm@386
   455
wenzelm@386
   456
wenzelm@386
   457
(** extend signature (old) **)      (* FIXME remove *)
wenzelm@251
   458
wenzelm@251
   459
fun extend sg name (classes, default, types, abbrs, arities, consts, opt_sext) =
wenzelm@251
   460
  let
wenzelm@267
   461
    fun read_abbr syn (c, vs, rhs_src) =
wenzelm@267
   462
      (c, (map (rpair 0) vs, varifyT (Syntax.read_typ syn (K []) rhs_src)))
wenzelm@267
   463
        handle ERROR => error ("The error(s) above occurred in the rhs " ^
wenzelm@267
   464
          quote rhs_src ^ "\nof type abbreviation " ^ quote c);
wenzelm@267
   465
wenzelm@251
   466
    (*reset TVar indices to 0, renaming to preserve distinctness*)
wenzelm@251
   467
    fun zero_tvar_idxs T =
wenzelm@169
   468
      let
wenzelm@169
   469
        val inxSs = typ_tvars T;
wenzelm@169
   470
        val nms' = variantlist (map (#1 o #1) inxSs, []);
wenzelm@251
   471
        val tye = map2 (fn ((v, S), a) => (v, TVar ((a, 0), S))) (inxSs, nms');
wenzelm@251
   472
      in
wenzelm@251
   473
        typ_subst_TVars tye T
wenzelm@251
   474
      end;
wenzelm@143
   475
wenzelm@169
   476
    (*read and check the type mentioned in a const declaration; zero type var
wenzelm@169
   477
      indices because type inference requires it*)
wenzelm@251
   478
    fun read_const tsig syn (c, s) =
wenzelm@251
   479
      (c, zero_tvar_idxs (varifyT (rd_typ tsig syn (K None) s)))
wenzelm@251
   480
        handle ERROR => error ("in declaration of constant " ^ quote c);
wenzelm@169
   481
wenzelm@143
   482
wenzelm@251
   483
    val Sg {tsig, const_tab, syn, stamps} = sg;
wenzelm@251
   484
    val xconsts = map #1 classes @ flat (map #1 types) @ map #1 abbrs @
wenzelm@251
   485
      flat (map #1 consts);
wenzelm@251
   486
    val sext = if_none opt_sext Syntax.empty_sext;
nipkow@200
   487
wenzelm@251
   488
    val tsig' = extend_tsig tsig (classes, default, types, arities);
wenzelm@386
   489
    val tsig1 = Type.ext_tsig_abbrs tsig' (map (read_abbr syn) abbrs);
wenzelm@143
   490
wenzelm@251
   491
    val syn1 = Syntax.extend syn (rd_typ tsig1 syn (K None))
wenzelm@251
   492
      (logical_types tsig1, xconsts, sext);
wenzelm@169
   493
wenzelm@251
   494
    val all_consts = flat (map (fn (cs, s) => map (rpair s) cs)
wenzelm@251
   495
      (Syntax.constants sext @ consts));
wenzelm@169
   496
wenzelm@277
   497
    val const_tab1 =
wenzelm@386
   498
      Symtab.extend_new (const_tab, map (read_const tsig1 syn) all_consts)
wenzelm@386
   499
        handle Symtab.DUPS cs => err_dup_consts cs;
wenzelm@251
   500
wenzelm@386
   501
    val stamps1 = ext_stamps stamps name;
wenzelm@143
   502
  in
wenzelm@251
   503
    Sg {tsig = tsig1, const_tab = const_tab1, syn = syn1, stamps = stamps1}
wenzelm@143
   504
  end;
clasohm@0
   505
clasohm@0
   506
clasohm@0
   507
wenzelm@386
   508
(** merge signatures **)    (*exception TERM*)
wenzelm@251
   509
wenzelm@251
   510
fun merge (sg1, sg2) =
wenzelm@251
   511
  if subsig (sg2, sg1) then sg1
wenzelm@251
   512
  else if subsig (sg1, sg2) then sg2
wenzelm@386
   513
  else if is_draft sg1 orelse is_draft sg2 then
wenzelm@386
   514
    raise_term "Illegal merge of draft signatures" []
wenzelm@251
   515
  else
wenzelm@251
   516
    (*neither is union already; must form union*)
wenzelm@251
   517
    let
wenzelm@251
   518
      val Sg {tsig = tsig1, const_tab = const_tab1, syn = syn1,
wenzelm@251
   519
        stamps = stamps1} = sg1;
wenzelm@251
   520
      val Sg {tsig = tsig2, const_tab = const_tab2, syn = syn2,
wenzelm@251
   521
        stamps = stamps2} = sg2;
wenzelm@251
   522
wenzelm@386
   523
wenzelm@251
   524
      val tsig = merge_tsigs (tsig1, tsig2);
wenzelm@251
   525
wenzelm@251
   526
      val const_tab = Symtab.merge (op =) (const_tab1, const_tab2)
wenzelm@386
   527
        handle Symtab.DUPS cs =>
wenzelm@386
   528
          raise_term ("Incompatible types for constant(s) " ^ commas_quote cs) [];
wenzelm@251
   529
wenzelm@386
   530
      val syn = Syntax.merge_syntaxes syn1 syn2;
wenzelm@251
   531
wenzelm@386
   532
      val stamps = merge_rev_lists stamps1 stamps2;
wenzelm@386
   533
      val dups = duplicates (stamp_names stamps);
wenzelm@251
   534
    in
wenzelm@386
   535
      if null dups then assert_stamps_ok stamps    (* FIXME debug *)
wenzelm@386
   536
      else raise_term ("Attempt to merge different versions of theories " ^
wenzelm@386
   537
        commas_quote dups) [];
wenzelm@251
   538
      Sg {tsig = tsig, const_tab = const_tab, syn = syn, stamps = stamps}
wenzelm@251
   539
    end;
wenzelm@251
   540
wenzelm@251
   541
wenzelm@251
   542
wenzelm@251
   543
(** the Pure signature **)
wenzelm@251
   544
wenzelm@386
   545
val pure =
wenzelm@386
   546
  make_sign (Syntax.type_syn, tsig0, Symtab.null) [] "#"
wenzelm@386
   547
  also add_types
wenzelm@386
   548
   (("fun", 2, NoSyn) ::
wenzelm@386
   549
    ("prop", 0, NoSyn) ::
wenzelm@386
   550
    ("itself", 1, NoSyn) ::
wenzelm@386
   551
    Syntax.Mixfix.pure_types)
wenzelm@386
   552
  also add_classes [([], logicC, [])]
wenzelm@386
   553
  also add_defsort logicS
wenzelm@386
   554
  also add_arities
wenzelm@386
   555
   [("fun", [logicS, logicS], logicS),
wenzelm@386
   556
    ("prop", [], logicS),
wenzelm@386
   557
    ("itself", [logicS], logicS)]
wenzelm@386
   558
  also add_syntax Syntax.Mixfix.pure_syntax
wenzelm@386
   559
  also add_trfuns Syntax.pure_trfuns
wenzelm@386
   560
  also add_consts
wenzelm@386
   561
   [("==", "['a::{}, 'a] => prop", Mixfix ("(_ ==/ _)", [3, 2], 2)),
wenzelm@386
   562
    ("=?=", "['a::{}, 'a] => prop", Mixfix ("(_ =?=/ _)", [3, 2], 2)),
wenzelm@386
   563
    ("==>", "[prop, prop] => prop", Mixfix ("(_ ==>/ _)", [2, 1], 1)),
wenzelm@386
   564
    ("all", "('a => prop) => prop", Binder ("!!", 0)),
wenzelm@386
   565
    ("TYPE", "'a itself", NoSyn),
wenzelm@386
   566
    (Syntax.constrainC, "'a::{} => 'a", NoSyn)]
wenzelm@386
   567
  also add_name "Pure";
wenzelm@143
   568
clasohm@0
   569
clasohm@0
   570
end;
wenzelm@143
   571