src/Pure/sign.ML
author wenzelm
Thu Nov 20 15:48:32 1997 +0100 (1997-11-20)
changeset 4261 e20b9fd85811
parent 4256 e768c42069bb
child 4344 e000b5db4087
permissions -rw-r--r--
improved error msg;
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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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*)
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(*base names*)
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type bstring = string;
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type bclass = class;
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(*external forms -- partially qualified names*)
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type xstring = string;
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type xclass = class;
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type xsort = sort;
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type xtyp = typ;
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type xterm = term;
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signature SIGN =
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sig
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  type sg
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  type sg_ref
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  type data
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  val rep_sg: sg ->
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   {self: sg_ref,
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    tsig: Type.type_sig,
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    const_tab: typ Symtab.table,
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    syn: Syntax.syntax,
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    path: string list,
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    spaces: (string * NameSpace.T) list,
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    data: data}
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  val name_of: sg -> string
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  val stamp_names_of: sg -> string list
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  val tsig_of: sg -> Type.type_sig
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  val deref: sg_ref -> sg
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  val self_ref: sg -> sg_ref
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  val subsig: sg * sg -> bool
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  val eq_sg: sg * sg -> bool
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  val same_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 classes: sg -> class list
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  val subsort: sg -> sort * sort -> bool
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  val nodup_Vars: term -> unit
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  val norm_sort: sg -> sort -> sort
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  val nonempty_sort: sg -> sort list -> sort -> bool
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  val long_names: bool ref
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  val classK: string
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  val typeK: string
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  val constK: string
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  val full_name: sg -> bstring -> string
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  val base_name: string -> bstring
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  val intern: sg -> string -> xstring -> string
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  val extern: sg -> string -> string -> xstring
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  val cond_extern: sg -> string -> string -> xstring
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  val intern_class: sg -> xclass -> class
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  val intern_tycon: sg -> xstring -> string
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  val intern_const: sg -> xstring -> string
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  val intern_sort: sg -> xsort -> sort
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  val intern_typ: sg -> xtyp -> typ
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  val intern_term: sg -> xterm -> term
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  val intern_tycons: sg -> xtyp -> typ
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  val pretty_sg: sg -> Pretty.T
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  val str_of_sg: sg -> string
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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 pretty_sort: sg -> sort -> Pretty.T
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  val pretty_classrel: sg -> class * class -> Pretty.T
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  val pretty_arity: sg -> string * sort list * sort -> 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 string_of_sort: sg -> sort -> string
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  val str_of_sort: sg -> sort -> string
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  val str_of_classrel: sg -> class * class -> string
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  val str_of_arity: sg -> string * sort list * sort -> 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_raw_typ: sg * (indexname -> sort option) -> string -> typ
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  val read_typ: sg * (indexname -> sort option) -> string -> typ
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  val infer_types: sg -> (indexname -> typ option) ->
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    (indexname -> sort option) -> string list -> bool
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    -> xterm list * typ -> term * (indexname * typ) list
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  val infer_types_simult: sg -> (indexname -> typ option) ->
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    (indexname -> sort option) -> string list -> bool
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    -> (xterm list * typ) list -> term list * (indexname * typ) list
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  val add_classes: (bclass * xclass list) list -> sg -> sg
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  val add_classes_i: (bclass * class list) list -> sg -> sg
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  val add_classrel: (xclass * xclass) list -> sg -> sg
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  val add_classrel_i: (class * class) list -> sg -> sg
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  val add_defsort: xsort -> sg -> sg
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  val add_defsort_i: sort -> sg -> sg
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  val add_types: (bstring * int * mixfix) list -> sg -> sg
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  val add_tyabbrs: (bstring * string list * string * mixfix) list -> sg -> sg
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  val add_tyabbrs_i: (bstring * string list * typ * mixfix) list -> sg -> sg
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  val add_arities: (xstring * xsort list * xsort) list -> sg -> sg
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  val add_arities_i: (string * sort list * sort) list -> sg -> sg
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  val add_consts: (bstring * string * mixfix) list -> sg -> sg
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  val add_consts_i: (bstring * typ * mixfix) list -> sg -> sg
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  val add_syntax: (bstring * string * mixfix) list -> sg -> sg
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  val add_syntax_i: (bstring * typ * mixfix) list -> sg -> sg
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  val add_modesyntax: (string * bool) * (bstring * string * mixfix) list -> sg -> sg
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  val add_modesyntax_i: (string * bool) * (bstring * typ * mixfix) list -> sg -> sg
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  val add_trfuns:
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    (bstring * (ast list -> ast)) list *
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    (bstring * (term list -> term)) list *
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    (bstring * (term list -> term)) list *
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    (bstring * (ast list -> ast)) list -> sg -> sg
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  val add_trfunsT:
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    (bstring * (bool -> typ -> term list -> term)) list -> sg -> sg
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  val add_tokentrfuns:
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    (string * string * (string -> string * int)) list -> sg -> sg
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  val add_trrules: (string * string) Syntax.trrule list -> sg -> sg
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  val add_trrules_i: ast Syntax.trrule list -> sg -> sg
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  val add_path: string -> sg -> sg
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  val add_space: string * string list -> sg -> sg
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  val add_name: string -> sg -> sg
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  val data_kinds: data -> string list
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  val init_data: string * (object * (object -> object) *
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    (object * object -> object) * (sg -> object -> unit)) -> sg -> sg
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  val get_data: sg -> string -> object
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  val put_data: string * object -> sg -> sg
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  val print_data: sg -> string -> unit
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  val merge_refs: sg_ref * sg_ref -> sg_ref
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  val prep_ext: sg -> sg
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  val merge: sg * sg -> sg
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  val pre_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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structure Sign: SIGN =
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struct
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(** datatype sg **)
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(* types sg, data, sg_ref *)
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datatype sg =
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  Sg of
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   {id: string ref,                             (*id*)
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    stamps: string ref list} *                  (*unique theory indentifier*)
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   {self: sg_ref,                               (*mutable self reference*)
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    tsig: Type.type_sig,                        (*order-sorted signature of types*)
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    const_tab: typ Symtab.table,                (*type schemes of constants*)
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    syn: Syntax.syntax,                         (*syntax for parsing and printing*)
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    path: string list,                          (*current name space entry prefix*)
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    spaces: (string * NameSpace.T) list,        (*name spaces for consts, types etc.*)
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    data: data}                                 (*anytype data*)
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and data =
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  Data of
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    (object *                             	(*value*)
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     ((object -> object) *                	(*prepare extend method*)
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      (object * object -> object) *       	(*merge and prepare extend method*)
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      (sg -> object -> unit)))                 	(*print method*)
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    Symtab.table
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and sg_ref =
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  SgRef of sg ref option
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(*make signature*)
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fun make_sign (id, self, tsig, const_tab, syn, path, spaces, data, stamps) =
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  Sg ({id = id, stamps = stamps}, {self = self, tsig = tsig, const_tab = const_tab,
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    syn = syn, path = path, spaces = spaces, data = data});
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(* basic operations *)
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fun rep_sg (Sg (_, args)) = args;
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(*show stamps*)
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fun stamp_names_of (Sg ({stamps, ...}, _)) = rev (map ! stamps);
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fun pretty_sg sg = Pretty.str_list "{" "}" (stamp_names_of sg);
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val str_of_sg = Pretty.str_of o pretty_sg;
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val pprint_sg = Pretty.pprint o pretty_sg;
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val tsig_of = #tsig o rep_sg;
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fun const_type (Sg (_, {const_tab, ...})) c = Symtab.lookup (const_tab, c);
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val classes = #classes o Type.rep_tsig o tsig_of;
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val subsort = Type.subsort o tsig_of;
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val norm_sort = Type.norm_sort o tsig_of;
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val nonempty_sort = Type.nonempty_sort o tsig_of;
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(* id and self *)
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fun check_stale (sg as Sg ({id, ...},
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        {self = SgRef (Some (ref (Sg ({id = id', ...}, _)))), ...})) =
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      if id = id' then sg
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      else raise TERM ("Stale signature: " ^ str_of_sg sg, [])
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  | check_stale _ = sys_error "Sign.check_stale";
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fun self_ref (sg as Sg (_, {self, ...})) = (check_stale sg; self);
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fun deref (SgRef (Some (ref sg))) = sg
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  | deref (SgRef None) = sys_error "Sign.deref";
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fun name_of (sg as Sg ({id = ref name, ...}, _)) =
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  if name = "" orelse name = "#" then
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    raise TERM ("Nameless signature " ^ str_of_sg sg, [])
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  else name;
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(* inclusion and equality *)
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local
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  (*avoiding polymorphic equality: factor 10 speedup*)
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  fun mem_stamp (_:string ref, []) = false
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    | mem_stamp (x, y :: ys) = x = y orelse mem_stamp (x, ys);
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  fun subset_stamp ([], ys) = true
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    | subset_stamp (x :: xs, ys) =
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        mem_stamp (x, ys) andalso subset_stamp (xs, ys);
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  (*fast partial test*)
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  fun fast_sub ([]: string ref list, _) = true
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    | fast_sub (_, []) = false
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    | fast_sub (x :: xs, y :: ys) =
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        if x = y then fast_sub (xs, ys)
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        else fast_sub (x :: xs, ys);
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in
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  fun eq_sg (sg1 as Sg ({id = id1, ...}, _), sg2 as Sg ({id = id2, ...}, _)) =
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    (check_stale sg1; check_stale sg2; id1 = id2);
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  fun subsig (sg1 as Sg ({stamps = s1, ...}, _), sg2 as Sg ({stamps = s2, ...}, _)) =
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    eq_sg (sg1, sg2) orelse subset_stamp (s1, s2);
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  fun fast_subsig (sg1 as Sg ({stamps = s1, ...}, _), sg2 as Sg ({stamps = s2, ...}, _)) =
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    eq_sg (sg1, sg2) orelse fast_sub (s1, s2);
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end;
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(*test if same theory names are contained in signatures' stamps,
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  i.e. if signatures belong to same theory but not necessarily to the
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  same version of it*)
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fun same_sg (sg1 as Sg ({stamps = s1, ...}, _), sg2 as Sg ({stamps = s2, ...}, _)) =
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  eq_sg (sg1, sg2) orelse eq_set_string (pairself (map (op !)) (s1, s2));
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(*test for drafts*)
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fun is_draft (Sg ({stamps = ref "#" :: _, ...}, _)) = true
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  | is_draft _ = false;
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(** signature data **)
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(* errors *)
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fun of_theory sg = "\nof theory " ^ str_of_sg sg;
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fun err_method name kind =
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  error ("Error while invoking " ^ quote kind ^ " method " ^ name);
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fun err_dup_init sg kind =
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  error ("Duplicate initialization of " ^ quote kind ^ " data" ^ of_theory sg);
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fun err_uninit sg kind =
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  error ("Tried to access uninitialized " ^ quote kind ^ " data" ^ of_theory sg);
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(* prepare data *)
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val empty_data = Data Symtab.null;
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fun merge_data (Data tab1, Data tab2) =
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  let
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    val data1 = Symtab.dest tab1;
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    val data2 = Symtab.dest tab2;
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    val all_data = data1 @ data2;
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    val kinds = distinct (map fst all_data);
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   fun entry data kind =
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     (case assoc (data, kind) of
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       None => []
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     | Some x => [(kind, x)]);
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    fun merge_entries [(kind, (e, mths as (ext, _, _)))] =
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          (kind, (ext e handle _ => err_method "prep_ext" kind, mths))
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      | merge_entries [(kind, (e1, mths as (_, mrg, _))), (_, (e2, _))] =
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          (kind, (mrg (e1, e2) handle _ => err_method "merge" kind, mths))
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      | merge_entries _ = sys_error "merge_entries";
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    val data = map (fn k => merge_entries (entry data1 k @ entry data2 k)) kinds;
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  in Data (Symtab.make data) end;
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fun prep_ext_data data = merge_data (data, empty_data);
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fun init_data_sg sg (Data tab) kind e ext mrg prt =
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  Data (Symtab.update_new ((kind, (e, (ext, mrg, prt))), tab))
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    handle Symtab.DUPLICATE _ => err_dup_init sg kind;
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(* access data *)
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fun data_kinds (Data tab) = map fst (Symtab.dest tab);
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fun lookup_data sg tab kind =
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  (case Symtab.lookup (tab, kind) of
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    Some x => x
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  | None => err_uninit sg kind);
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fun get_data (sg as Sg (_, {data = Data tab, ...})) kind =
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  fst (lookup_data sg tab kind);
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fun print_data (sg as Sg (_, {data = Data tab, ...})) kind =
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  let val (e, (_, _, prt)) = lookup_data sg tab kind
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  in prt sg e handle _ => err_method ("print" ^ of_theory sg) kind end;
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fun put_data_sg sg (Data tab) kind e =
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  Data (Symtab.update ((kind, (e, snd (lookup_data sg tab kind))), tab));
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(** build signatures **)
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fun ext_stamps stamps (id as ref name) =
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  let val stmps = (case stamps of ref "#" :: ss => ss | ss => ss) in
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    if exists (equal name o !) stmps then
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      error ("Theory already contains a " ^ quote name ^ " component")
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    else id :: stmps
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  end;
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   326
fun create_sign self stamps name (syn, tsig, ctab, (path, spaces), data) =
wenzelm@3967
   327
  let
wenzelm@3967
   328
    val id = ref name;
wenzelm@3967
   329
    val sign =
wenzelm@3967
   330
      make_sign (id, self, tsig, ctab, syn, path, spaces, data, ext_stamps stamps id);
wenzelm@3967
   331
  in
wenzelm@3967
   332
    (case self of
wenzelm@3967
   333
      SgRef (Some r) => r := sign
wenzelm@3967
   334
    | _ => sys_error "Sign.create_sign");
wenzelm@3967
   335
    sign
wenzelm@3967
   336
  end;
wenzelm@3967
   337
wenzelm@3975
   338
fun extend_sign keep extfun name decls
wenzelm@3975
   339
    (sg as Sg ({id = _, stamps}, {self, tsig, const_tab, syn, path, spaces, data})) =
wenzelm@3967
   340
  let
wenzelm@3967
   341
    val _ = check_stale sg;
wenzelm@3967
   342
    val (self', data') =
wenzelm@3975
   343
      if is_draft sg andalso keep then (self, data)
wenzelm@4256
   344
      else (SgRef (Some (ref sg)), prep_ext_data data);
wenzelm@3967
   345
  in
wenzelm@3967
   346
    create_sign self' stamps name
wenzelm@3967
   347
      (extfun (syn, tsig, const_tab, (path, spaces), data') decls)
wenzelm@3967
   348
  end;
wenzelm@3967
   349
wenzelm@3967
   350
wenzelm@3791
   351
wenzelm@3791
   352
(** name spaces **)
wenzelm@3791
   353
wenzelm@3805
   354
(*prune names on output by default*)
wenzelm@3791
   355
val long_names = ref false;
wenzelm@3791
   356
wenzelm@3791
   357
wenzelm@3791
   358
(* kinds *)
wenzelm@3791
   359
wenzelm@3791
   360
val classK = "class";
wenzelm@3791
   361
val typeK = "type";
wenzelm@3791
   362
val constK = "const";
wenzelm@3791
   363
wenzelm@3791
   364
wenzelm@3791
   365
(* add and retrieve names *)
wenzelm@3791
   366
wenzelm@3791
   367
fun space_of spaces kind =
wenzelm@3791
   368
  if_none (assoc (spaces, kind)) NameSpace.empty;
wenzelm@3791
   369
wenzelm@3791
   370
(*input and output of qualified names*)
wenzelm@3995
   371
fun intrn spaces kind = NameSpace.intern (space_of spaces kind);
wenzelm@3995
   372
fun extrn spaces kind = NameSpace.extern (space_of spaces kind);
wenzelm@3791
   373
wenzelm@3791
   374
(*add names*)
wenzelm@3791
   375
fun add_names spaces kind names =
wenzelm@3791
   376
  let val space' = NameSpace.extend (names, space_of spaces kind) in
wenzelm@3791
   377
    overwrite (spaces, (kind, space'))
wenzelm@3791
   378
  end;
wenzelm@3791
   379
wenzelm@3810
   380
(*make full names*)
wenzelm@3937
   381
fun full path name =
wenzelm@3937
   382
  if NameSpace.qualified name then
wenzelm@3937
   383
    error ("Attempt to declare qualified name " ^ quote name)
wenzelm@3937
   384
  else NameSpace.pack (path @ [name]);
wenzelm@3937
   385
wenzelm@3937
   386
(*base name*)
wenzelm@3937
   387
val base_name = NameSpace.base;
wenzelm@3791
   388
wenzelm@3791
   389
wenzelm@3791
   390
(* intern / extern names *)
wenzelm@3791
   391
wenzelm@3791
   392
local
wenzelm@3791
   393
  (*prepare mapping of names*)
wenzelm@3791
   394
  fun mapping f add_xs t =
wenzelm@3791
   395
    let
wenzelm@3791
   396
      fun f' x = let val y = f x in if x = y then None else Some (x, y) end;
wenzelm@3791
   397
      val table = mapfilter f' (add_xs (t, []));
wenzelm@3791
   398
      fun lookup x = if_none (assoc (table, x)) x;
wenzelm@3791
   399
    in lookup end;
wenzelm@3791
   400
wenzelm@3791
   401
  (*intern / extern typ*)
wenzelm@3791
   402
  fun trn_typ trn T =
wenzelm@3791
   403
    T |> map_typ
wenzelm@3791
   404
      (mapping (trn classK) add_typ_classes T)
wenzelm@3791
   405
      (mapping (trn typeK) add_typ_tycons T);
wenzelm@3791
   406
wenzelm@3791
   407
  (*intern / extern term*)
wenzelm@3791
   408
  fun trn_term trn t =
wenzelm@3791
   409
    t |> map_term
wenzelm@3791
   410
      (mapping (trn classK) add_term_classes t)
wenzelm@3791
   411
      (mapping (trn typeK) add_term_tycons t)
wenzelm@3791
   412
      (mapping (trn constK) add_term_consts t);
wenzelm@3791
   413
wenzelm@3975
   414
  val spaces_of = #spaces o rep_sg;
wenzelm@3791
   415
in
wenzelm@3791
   416
  fun intrn_class spaces = intrn spaces classK;
wenzelm@3791
   417
  fun extrn_class spaces = extrn spaces classK;
wenzelm@3937
   418
wenzelm@3791
   419
  val intrn_sort = map o intrn_class;
wenzelm@3791
   420
  val intrn_typ = trn_typ o intrn;
wenzelm@3937
   421
  val intrn_term = trn_term o intrn;
wenzelm@3937
   422
wenzelm@3937
   423
  val extrn_sort = map o extrn_class;
wenzelm@3791
   424
  val extrn_typ = trn_typ o extrn;
wenzelm@3791
   425
  val extrn_term = trn_term o extrn;
wenzelm@3791
   426
wenzelm@3805
   427
  fun intrn_tycons spaces T =
wenzelm@3805
   428
    map_typ I (mapping (intrn spaces typeK) add_typ_tycons T) T;
wenzelm@3805
   429
wenzelm@3810
   430
  val intern = intrn o spaces_of;
wenzelm@3855
   431
  val extern = extrn o spaces_of;
wenzelm@3937
   432
  fun cond_extern sg kind = if ! long_names then I else extern sg kind;
wenzelm@3937
   433
wenzelm@3791
   434
  val intern_class = intrn_class o spaces_of;
wenzelm@3791
   435
  val intern_sort = intrn_sort o spaces_of;
wenzelm@3791
   436
  val intern_typ = intrn_typ o spaces_of;
wenzelm@3791
   437
  val intern_term = intrn_term o spaces_of;
wenzelm@3791
   438
wenzelm@3791
   439
  fun intern_tycon sg = intrn (spaces_of sg) typeK;
wenzelm@3791
   440
  fun intern_const sg = intrn (spaces_of sg) constK;
wenzelm@3937
   441
wenzelm@3791
   442
  val intern_tycons = intrn_tycons o spaces_of;
wenzelm@3791
   443
wenzelm@3975
   444
  val full_name = full o #path o rep_sg;
wenzelm@3791
   445
end;
wenzelm@620
   446
wenzelm@402
   447
clasohm@0
   448
wenzelm@4249
   449
(** pretty printing of terms, types etc. **)
wenzelm@3937
   450
wenzelm@4249
   451
fun pretty_term (sg as Sg ({stamps, ...}, {syn, spaces, ...})) t =
wenzelm@3937
   452
  Syntax.pretty_term syn
wenzelm@4249
   453
    (exists (equal "CPure" o !) stamps)
wenzelm@3937
   454
    (if ! long_names then t else extrn_term spaces t);
wenzelm@3937
   455
wenzelm@3975
   456
fun pretty_typ (Sg (_, {syn, spaces, ...})) T =
wenzelm@3937
   457
  Syntax.pretty_typ syn
wenzelm@3937
   458
    (if ! long_names then T else extrn_typ spaces T);
wenzelm@3937
   459
wenzelm@3975
   460
fun pretty_sort (Sg (_, {syn, spaces, ...})) S =
wenzelm@3937
   461
  Syntax.pretty_sort syn
wenzelm@3937
   462
    (if ! long_names then S else extrn_sort spaces S);
wenzelm@3937
   463
wenzelm@3937
   464
fun pretty_classrel sg (c1, c2) = Pretty.block
wenzelm@3937
   465
  [pretty_sort sg [c1], Pretty.str " <", Pretty.brk 1, pretty_sort sg [c2]];
wenzelm@3937
   466
wenzelm@3937
   467
fun pretty_arity sg (t, Ss, S) =
wenzelm@3937
   468
  let
wenzelm@3937
   469
    val t' = cond_extern sg typeK t;
wenzelm@3937
   470
    val dom =
wenzelm@3937
   471
      if null Ss then []
wenzelm@3937
   472
      else [Pretty.list "(" ")" (map (pretty_sort sg) Ss), Pretty.brk 1];
wenzelm@3937
   473
  in
wenzelm@3937
   474
    Pretty.block
wenzelm@3937
   475
      ([Pretty.str (t' ^ " ::"), Pretty.brk 1] @ dom @ [pretty_sort sg S])
wenzelm@3937
   476
  end;
wenzelm@3937
   477
wenzelm@3937
   478
fun string_of_term sg t = Pretty.string_of (pretty_term sg t);
wenzelm@3937
   479
fun string_of_typ sg T = Pretty.string_of (pretty_typ sg T);
wenzelm@3937
   480
fun string_of_sort sg S = Pretty.string_of (pretty_sort sg S);
wenzelm@3937
   481
wenzelm@3937
   482
fun str_of_sort sg S = Pretty.str_of (pretty_sort sg S);
wenzelm@3937
   483
fun str_of_classrel sg c1_c2 = Pretty.str_of (pretty_classrel sg c1_c2);
wenzelm@3937
   484
fun str_of_arity sg ar = Pretty.str_of (pretty_arity sg ar);
wenzelm@3937
   485
wenzelm@3937
   486
fun pprint_term sg = Pretty.pprint o Pretty.quote o (pretty_term sg);
wenzelm@3937
   487
fun pprint_typ sg = Pretty.pprint o Pretty.quote o (pretty_typ sg);
wenzelm@3937
   488
wenzelm@3937
   489
wenzelm@3937
   490
wenzelm@562
   491
(** read types **)  (*exception ERROR*)
wenzelm@562
   492
wenzelm@562
   493
fun err_in_type s =
wenzelm@562
   494
  error ("The error(s) above occurred in type " ^ quote s);
wenzelm@562
   495
wenzelm@4227
   496
fun rd_raw_typ syn tsig spaces def_sort str =
wenzelm@3791
   497
  intrn_tycons spaces
wenzelm@3791
   498
    (Syntax.read_typ syn (Type.get_sort tsig def_sort (intrn_sort spaces)) str
wenzelm@3791
   499
      handle ERROR => err_in_type str);
wenzelm@4227
   500
wenzelm@4227
   501
fun read_raw_typ (sg as Sg (_, {tsig, syn, spaces, ...}), def_sort) str =
wenzelm@4227
   502
  (check_stale sg; rd_raw_typ syn tsig spaces def_sort str);
wenzelm@4227
   503
wenzelm@562
   504
(*read and certify typ wrt a signature*)
wenzelm@4227
   505
fun read_typ (sg, def_sort) str =
wenzelm@4227
   506
  (Type.cert_typ (tsig_of sg) (read_raw_typ (sg, def_sort) str)
wenzelm@3969
   507
      handle TYPE (msg, _, _) => (error_msg msg; err_in_type str));
wenzelm@562
   508
wenzelm@562
   509
wenzelm@562
   510
wenzelm@386
   511
(** certify types and terms **)   (*exception TYPE*)
wenzelm@251
   512
wenzelm@3975
   513
val certify_typ = Type.cert_typ o tsig_of;
wenzelm@251
   514
wenzelm@2979
   515
(*check for duplicate TVars with distinct sorts*)
wenzelm@2979
   516
fun nodup_TVars (tvars, T) =
wenzelm@2979
   517
  (case T of
wenzelm@2979
   518
    Type (_, Ts) => nodup_TVars_list (tvars, Ts)
wenzelm@2979
   519
  | TFree _ => tvars
wenzelm@2979
   520
  | TVar (v as (a, S)) =>
wenzelm@2979
   521
      (case assoc_string_int (tvars, a) of
wenzelm@2979
   522
        Some S' =>
wenzelm@2979
   523
          if S = S' then tvars
wenzelm@3791
   524
          else raise TYPE ("Type variable " ^ Syntax.string_of_vname a ^
wenzelm@3791
   525
            " has two distinct sorts", [TVar (a, S'), T], [])
wenzelm@2979
   526
      | None => v :: tvars))
wenzelm@2979
   527
(*equivalent to foldl nodup_TVars_list, but 3X faster under Poly/ML*)
wenzelm@2979
   528
and nodup_TVars_list (tvars, []) = tvars
wenzelm@2979
   529
  | nodup_TVars_list (tvars, T :: Ts) =
wenzelm@2979
   530
      nodup_TVars_list (nodup_TVars (tvars, T), Ts);
nipkow@1494
   531
wenzelm@2979
   532
(*check for duplicate Vars with distinct types*)
nipkow@1494
   533
fun nodup_Vars tm =
wenzelm@2979
   534
  let
wenzelm@2979
   535
    fun nodups vars tvars tm =
wenzelm@2979
   536
      (case tm of
wenzelm@2979
   537
        Const (c, T) => (vars, nodup_TVars (tvars, T))
wenzelm@2979
   538
      | Free (a, T) => (vars, nodup_TVars (tvars, T))
wenzelm@2979
   539
      | Var (v as (ixn, T)) =>
wenzelm@2979
   540
          (case assoc_string_int (vars, ixn) of
wenzelm@2979
   541
            Some T' =>
wenzelm@2979
   542
              if T = T' then (vars, nodup_TVars (tvars, T))
wenzelm@3791
   543
              else raise TYPE ("Variable " ^ Syntax.string_of_vname ixn ^
wenzelm@3791
   544
                " has two distinct types", [T', T], [])
wenzelm@2979
   545
          | None => (v :: vars, tvars))
wenzelm@2979
   546
      | Bound _ => (vars, tvars)
wenzelm@3791
   547
      | Abs (_, T, t) => nodups vars (nodup_TVars (tvars, T)) t
wenzelm@2979
   548
      | s $ t =>
wenzelm@2979
   549
          let val (vars',tvars') = nodups vars tvars s in
wenzelm@2979
   550
            nodups vars' tvars' t
wenzelm@2979
   551
          end);
wenzelm@2979
   552
  in nodups [] [] tm; () end;
wenzelm@2979
   553
wenzelm@251
   554
wenzelm@386
   555
fun mapfilt_atoms f (Abs (_, _, t)) = mapfilt_atoms f t
wenzelm@386
   556
  | mapfilt_atoms f (t $ u) = mapfilt_atoms f t @ mapfilt_atoms f u
wenzelm@386
   557
  | mapfilt_atoms f a = (case f a of Some y => [y] | None => []);
clasohm@0
   558
wenzelm@2979
   559
wenzelm@3975
   560
fun certify_term sg tm =
wenzelm@251
   561
  let
wenzelm@3969
   562
    val _ = check_stale sg;
wenzelm@3975
   563
    val tsig = tsig_of sg;
wenzelm@3969
   564
wenzelm@3975
   565
    fun show_const a T = quote a ^ " :: " ^ quote (string_of_typ sg T);
wenzelm@169
   566
wenzelm@251
   567
    fun atom_err (Const (a, T)) =
wenzelm@3975
   568
        (case const_type sg a of
wenzelm@3975
   569
          None => Some ("Undeclared constant " ^ show_const a T)
wenzelm@3975
   570
        | Some U =>
wenzelm@3975
   571
            if Type.typ_instance (tsig, T, U) then None
wenzelm@3975
   572
            else Some ("Illegal type for constant " ^ show_const a T))
wenzelm@251
   573
      | atom_err (Var ((x, i), _)) =
wenzelm@251
   574
          if i < 0 then Some ("Negative index for Var " ^ quote x) else None
wenzelm@251
   575
      | atom_err _ = None;
wenzelm@251
   576
wenzelm@251
   577
    val norm_tm =
wenzelm@2185
   578
      (case it_term_types (Type.typ_errors tsig) (tm, []) of
wenzelm@2185
   579
        [] => map_term_types (Type.norm_typ tsig) tm
wenzelm@3791
   580
      | errs => raise TYPE (cat_lines errs, [], [tm]));
nipkow@1494
   581
    val _ = nodup_Vars norm_tm;
wenzelm@251
   582
  in
wenzelm@386
   583
    (case mapfilt_atoms atom_err norm_tm of
wenzelm@251
   584
      [] => (norm_tm, type_of norm_tm, maxidx_of_term norm_tm)
wenzelm@3791
   585
    | errs => raise TYPE (cat_lines errs, [], [norm_tm]))
wenzelm@251
   586
  end;
wenzelm@251
   587
wenzelm@251
   588
wenzelm@251
   589
wenzelm@583
   590
(** infer_types **)         (*exception ERROR*)
wenzelm@251
   591
wenzelm@2979
   592
(*
wenzelm@2979
   593
  def_type: partial map from indexnames to types (constrains Frees, Vars)
wenzelm@2979
   594
  def_sort: partial map from indexnames to sorts (constrains TFrees, TVars)
wenzelm@2979
   595
  used: list of already used type variables
wenzelm@2979
   596
  freeze: if true then generated parameters are turned into TFrees, else TVars
wenzelm@4249
   597
wenzelm@4249
   598
  termss: lists of alternative parses (only one combination should be type-correct)
wenzelm@4249
   599
  typs: expected types
wenzelm@2979
   600
*)
wenzelm@2979
   601
wenzelm@4249
   602
fun infer_types_simult sg def_type def_sort used freeze args =
wenzelm@251
   603
  let
wenzelm@3975
   604
    val tsig = tsig_of sg;
wenzelm@3810
   605
    val prt =
wenzelm@3810
   606
      setmp Syntax.show_brackets true
wenzelm@3810
   607
        (setmp long_names true (pretty_term sg));
wenzelm@3810
   608
    val prT = setmp long_names true (pretty_typ sg);
wenzelm@4249
   609
wenzelm@4249
   610
    val termss = foldr multiply (map fst args, [[]]);
wenzelm@4249
   611
    val typs =
wenzelm@4249
   612
      map (fn (_, T) => certify_typ sg T handle TYPE (msg, _, _) => error msg) args;
wenzelm@169
   613
wenzelm@4249
   614
    fun infer ts = OK
wenzelm@4249
   615
      (Type.infer_types prt prT tsig (const_type sg) def_type def_sort
wenzelm@4249
   616
        (intern_const sg) (intern_tycons sg) (intern_sort sg) used freeze typs ts)
wenzelm@4249
   617
      handle TYPE (msg, _, _) => Error msg;
clasohm@623
   618
wenzelm@4249
   619
    val err_results = map infer termss;
wenzelm@4249
   620
    val errs = mapfilter get_error err_results;
wenzelm@4249
   621
    val results = mapfilter get_ok err_results;
wenzelm@4249
   622
wenzelm@4249
   623
    val ambiguity = length termss;	(* FIXME !? *)
wenzelm@4249
   624
    (* FIXME to syntax.ML!? *)
wenzelm@4249
   625
    fun ambig_msg () =
wenzelm@4249
   626
      if ambiguity > 1 andalso ambiguity <= ! Syntax.ambiguity_level
wenzelm@4249
   627
      then
wenzelm@4249
   628
        error_msg "Got more than one parse tree.\n\
wenzelm@3805
   629
          \Retry with smaller Syntax.ambiguity_level for more information."
nipkow@952
   630
      else ();
wenzelm@4249
   631
  in
wenzelm@4249
   632
    if null results then (ambig_msg (); error (cat_lines errs))
wenzelm@4249
   633
    else if length results = 1 then
wenzelm@4249
   634
      (if ambiguity > ! Syntax.ambiguity_level then
wenzelm@4249
   635
        warning "Fortunately, only one parse tree is type correct.\n\
wenzelm@4249
   636
          \You may still want to disambiguate your grammar or your input."
wenzelm@4249
   637
      else (); hd results)
wenzelm@4249
   638
    else (ambig_msg (); error ("More than one term is type correct:\n" ^
wenzelm@4249
   639
      (cat_lines (map (Pretty.string_of o prt) (flat (map fst results))))))
wenzelm@4249
   640
  end;
clasohm@623
   641
wenzelm@4249
   642
wenzelm@4249
   643
fun infer_types sg def_type def_sort used freeze tsT =
wenzelm@4249
   644
  apfst hd (infer_types_simult sg def_type def_sort used freeze [tsT]);
wenzelm@251
   645
wenzelm@251
   646
wenzelm@2979
   647
clasohm@623
   648
(** extend signature **)    (*exception ERROR*)
clasohm@623
   649
wenzelm@620
   650
(** signature extension functions **)  (*exception ERROR*)
wenzelm@386
   651
wenzelm@3791
   652
fun decls_of path name_of mfixs =
wenzelm@3810
   653
  map (fn (x, y, mx) => (full path (name_of x mx), y)) mfixs;
wenzelm@3791
   654
wenzelm@3791
   655
fun no_read _ _ _ decl = decl;
wenzelm@386
   656
wenzelm@386
   657
wenzelm@386
   658
(* add default sort *)
wenzelm@386
   659
wenzelm@3967
   660
fun ext_defsort int (syn, tsig, ctab, (path, spaces), data) S =
wenzelm@3791
   661
  (syn, Type.ext_tsig_defsort tsig (if int then intrn_sort spaces S else S),
wenzelm@3967
   662
    ctab, (path, spaces), data);
wenzelm@386
   663
wenzelm@386
   664
wenzelm@386
   665
(* add type constructors *)
wenzelm@386
   666
wenzelm@3967
   667
fun ext_types (syn, tsig, ctab, (path, spaces), data) types =
wenzelm@3791
   668
  let val decls = decls_of path Syntax.type_name types in
wenzelm@3791
   669
    (Syntax.extend_type_gram syn types,
wenzelm@3791
   670
      Type.ext_tsig_types tsig decls, ctab,
wenzelm@3967
   671
      (path, add_names spaces typeK (map fst decls)), data)
wenzelm@3791
   672
  end;
wenzelm@386
   673
wenzelm@386
   674
wenzelm@386
   675
(* add type abbreviations *)
wenzelm@386
   676
wenzelm@3791
   677
fun read_abbr syn tsig spaces (t, vs, rhs_src) =
wenzelm@4227
   678
  (t, vs, rd_raw_typ syn tsig spaces (K None) rhs_src)
wenzelm@386
   679
    handle ERROR => error ("in type abbreviation " ^ t);
wenzelm@386
   680
wenzelm@3967
   681
fun ext_abbrs rd_abbr (syn, tsig, ctab, (path, spaces), data) abbrs =
wenzelm@386
   682
  let
wenzelm@386
   683
    fun mfix_of (t, vs, _, mx) = (t, length vs, mx);
wenzelm@3791
   684
    val syn' = Syntax.extend_type_gram syn (map mfix_of abbrs);
wenzelm@386
   685
wenzelm@3791
   686
    val abbrs' =
wenzelm@3791
   687
      map (fn (t, vs, rhs, mx) =>
wenzelm@3810
   688
        (full path (Syntax.type_name t mx), vs, rhs)) abbrs;
wenzelm@3805
   689
    val spaces' = add_names spaces typeK (map #1 abbrs');
wenzelm@3805
   690
    val decls = map (rd_abbr syn' tsig spaces') abbrs';
wenzelm@386
   691
  in
wenzelm@3967
   692
    (syn', Type.ext_tsig_abbrs tsig decls, ctab, (path, spaces'), data)
wenzelm@386
   693
  end;
wenzelm@386
   694
wenzelm@3791
   695
fun ext_tyabbrs abbrs = ext_abbrs read_abbr abbrs;
wenzelm@3791
   696
fun ext_tyabbrs_i abbrs = ext_abbrs no_read abbrs;
wenzelm@386
   697
wenzelm@386
   698
wenzelm@386
   699
(* add type arities *)
wenzelm@386
   700
wenzelm@3967
   701
fun ext_arities int (syn, tsig, ctab, (path, spaces), data) arities =
wenzelm@386
   702
  let
wenzelm@3791
   703
    fun intrn_arity (c, Ss, S) =
wenzelm@3791
   704
      (intrn spaces typeK c, map (intrn_sort spaces) Ss, intrn_sort spaces S);
wenzelm@3791
   705
    val intrn = if int then map intrn_arity else I;
wenzelm@3791
   706
    val tsig' = Type.ext_tsig_arities tsig (intrn arities);
wenzelm@3791
   707
    val log_types = Type.logical_types tsig';
wenzelm@386
   708
  in
wenzelm@3967
   709
    (Syntax.extend_log_types syn log_types, tsig', ctab, (path, spaces), data)
wenzelm@386
   710
  end;
wenzelm@386
   711
wenzelm@386
   712
wenzelm@386
   713
(* add term constants and syntax *)
wenzelm@386
   714
wenzelm@3805
   715
fun const_name path c mx =
wenzelm@3810
   716
  full path (Syntax.const_name c mx);
wenzelm@3805
   717
wenzelm@386
   718
fun err_in_const c =
wenzelm@386
   719
  error ("in declaration of constant " ^ quote c);
wenzelm@386
   720
wenzelm@386
   721
fun err_dup_consts cs =
wenzelm@386
   722
  error ("Duplicate declaration of constant(s) " ^ commas_quote cs);
wenzelm@386
   723
wenzelm@251
   724
wenzelm@3805
   725
fun read_const syn tsig (path, spaces) (c, ty_src, mx) =
wenzelm@4227
   726
  (c, rd_raw_typ syn tsig spaces (K None) ty_src, mx)
wenzelm@3805
   727
    handle ERROR => err_in_const (const_name path c mx);
wenzelm@386
   728
wenzelm@3967
   729
fun ext_cnsts rd_const syn_only prmode (syn, tsig, ctab, (path, spaces), data) raw_consts =
wenzelm@386
   730
  let
wenzelm@2979
   731
    fun prep_const (c, ty, mx) =
wenzelm@3791
   732
      (c, compress_type (Type.varifyT (Type.cert_typ tsig (Type.no_tvars ty))), mx)
wenzelm@3791
   733
        handle TYPE (msg, _, _) =>
wenzelm@3805
   734
          (error_msg msg; err_in_const (const_name path c mx));
wenzelm@386
   735
wenzelm@3805
   736
    val consts = map (prep_const o rd_const syn tsig (path, spaces)) raw_consts;
wenzelm@386
   737
    val decls =
wenzelm@386
   738
      if syn_only then []
wenzelm@3791
   739
      else decls_of path Syntax.const_name consts;
wenzelm@386
   740
  in
wenzelm@2197
   741
    (Syntax.extend_const_gram syn prmode consts, tsig,
wenzelm@386
   742
      Symtab.extend_new (ctab, decls)
wenzelm@3791
   743
        handle Symtab.DUPS cs => err_dup_consts cs,
wenzelm@3967
   744
      (path, add_names spaces constK (map fst decls)), data)
wenzelm@386
   745
  end;
wenzelm@386
   746
wenzelm@4007
   747
fun ext_consts_i sg = ext_cnsts no_read false ("", true) sg;
wenzelm@4007
   748
fun ext_consts sg = ext_cnsts read_const false ("", true) sg;
wenzelm@4007
   749
fun ext_syntax_i sg = ext_cnsts no_read true ("", true) sg;
wenzelm@4007
   750
fun ext_syntax sg = ext_cnsts read_const true ("", true) sg;
wenzelm@3791
   751
fun ext_modesyntax_i sg (prmode, consts) = ext_cnsts no_read true prmode sg consts;
wenzelm@2197
   752
fun ext_modesyntax sg (prmode, consts) = ext_cnsts read_const true prmode sg consts;
wenzelm@386
   753
wenzelm@386
   754
wenzelm@386
   755
(* add type classes *)
wenzelm@386
   756
wenzelm@386
   757
fun const_of_class c = c ^ "_class";
wenzelm@386
   758
wenzelm@386
   759
fun class_of_const c_class =
wenzelm@386
   760
  let
wenzelm@3791
   761
    val c = implode (take (size c_class - size "_class", explode c_class));
wenzelm@386
   762
  in
wenzelm@386
   763
    if const_of_class c = c_class then c
wenzelm@3791
   764
    else raise TERM ("class_of_const: bad name " ^ quote c_class, [])
wenzelm@386
   765
  end;
wenzelm@386
   766
wenzelm@386
   767
wenzelm@3967
   768
fun ext_classes int (syn, tsig, ctab, (path, spaces), data) classes =
wenzelm@386
   769
  let
wenzelm@562
   770
    val names = map fst classes;
wenzelm@386
   771
    val consts =
wenzelm@386
   772
      map (fn c => (const_of_class c, a_itselfT --> propT, NoSyn)) names;
wenzelm@3791
   773
wenzelm@3810
   774
    val full_names = map (full path) names;
wenzelm@3791
   775
    val spaces' = add_names spaces classK full_names;
wenzelm@3791
   776
    val intrn = if int then map (intrn_class spaces') else I;
wenzelm@3791
   777
    val classes' =
wenzelm@3791
   778
      ListPair.map (fn (c, (_, cs)) => (c, intrn cs)) (full_names, classes);
wenzelm@386
   779
  in
wenzelm@386
   780
    ext_consts_i
wenzelm@3791
   781
      (Syntax.extend_consts syn names,
wenzelm@3967
   782
        Type.ext_tsig_classes tsig classes', ctab, (path, spaces'), data)
wenzelm@3791
   783
    consts
wenzelm@386
   784
  end;
wenzelm@386
   785
wenzelm@386
   786
wenzelm@2963
   787
(* add to classrel *)
wenzelm@421
   788
wenzelm@3967
   789
fun ext_classrel int (syn, tsig, ctab, (path, spaces), data) pairs =
wenzelm@3791
   790
  let val intrn = if int then map (pairself (intrn_class spaces)) else I in
wenzelm@3967
   791
    (syn, Type.ext_tsig_classrel tsig (intrn pairs), ctab, (path, spaces), data)
wenzelm@3791
   792
  end;
wenzelm@421
   793
wenzelm@421
   794
wenzelm@1159
   795
(* add to syntax *)
wenzelm@386
   796
wenzelm@3967
   797
fun ext_syn extfun (syn, tsig, ctab, names, data) args =
wenzelm@3967
   798
  (extfun syn args, tsig, ctab, names, data);
wenzelm@3791
   799
wenzelm@3791
   800
wenzelm@3791
   801
(* add to path *)
wenzelm@3791
   802
wenzelm@3967
   803
fun ext_path (syn, tsig, ctab, (path, spaces), data) elem =
wenzelm@3791
   804
  let
wenzelm@3791
   805
    val path' =
wenzelm@3791
   806
      if elem = ".." andalso not (null path) then fst (split_last path)
wenzelm@3791
   807
      else if elem = "/" then []
wenzelm@3791
   808
      else path @ NameSpace.unpack elem;
wenzelm@3791
   809
  in
wenzelm@3967
   810
    (syn, tsig, ctab, (path', spaces), data)
wenzelm@3791
   811
  end;      
wenzelm@3791
   812
wenzelm@3791
   813
wenzelm@3791
   814
(* add to name space *)
wenzelm@3791
   815
wenzelm@3967
   816
fun ext_space (syn, tsig, ctab, (path, spaces), data) (kind, names) =
wenzelm@3967
   817
  (syn, tsig, ctab, (path, add_names spaces kind names), data);
wenzelm@386
   818
wenzelm@386
   819
wenzelm@3967
   820
(* signature data *)
wenzelm@386
   821
wenzelm@4256
   822
fun ext_init_data sg (syn, tsig, ctab, names, data) (kind, (e, ext, mrg, prt)) =
wenzelm@4256
   823
  (syn, tsig, ctab, names, init_data_sg sg data kind e ext mrg prt);
wenzelm@386
   824
wenzelm@4256
   825
fun ext_put_data sg (syn, tsig, ctab, names, data) (kind, e) =
wenzelm@4256
   826
  (syn, tsig, ctab, names, put_data_sg sg data kind e);
wenzelm@386
   827
wenzelm@386
   828
wenzelm@386
   829
(* the external interfaces *)
wenzelm@386
   830
wenzelm@3975
   831
val add_classes      = extend_sign true (ext_classes true) "#";
wenzelm@3975
   832
val add_classes_i    = extend_sign true (ext_classes false) "#";
wenzelm@3975
   833
val add_classrel     = extend_sign true (ext_classrel true) "#";
wenzelm@3975
   834
val add_classrel_i   = extend_sign true (ext_classrel false) "#";
wenzelm@3975
   835
val add_defsort      = extend_sign true (ext_defsort true) "#";
wenzelm@3975
   836
val add_defsort_i    = extend_sign true (ext_defsort false) "#";
wenzelm@3975
   837
val add_types        = extend_sign true ext_types "#";
wenzelm@3975
   838
val add_tyabbrs      = extend_sign true ext_tyabbrs "#";
wenzelm@3975
   839
val add_tyabbrs_i    = extend_sign true ext_tyabbrs_i "#";
wenzelm@3975
   840
val add_arities      = extend_sign true (ext_arities true) "#";
wenzelm@3975
   841
val add_arities_i    = extend_sign true (ext_arities false) "#";
wenzelm@3975
   842
val add_consts       = extend_sign true ext_consts "#";
wenzelm@3975
   843
val add_consts_i     = extend_sign true ext_consts_i "#";
wenzelm@3975
   844
val add_syntax       = extend_sign true ext_syntax "#";
wenzelm@3975
   845
val add_syntax_i     = extend_sign true ext_syntax_i "#";
wenzelm@3975
   846
val add_modesyntax   = extend_sign true ext_modesyntax "#";
wenzelm@3975
   847
val add_modesyntax_i = extend_sign true ext_modesyntax_i "#";
wenzelm@3975
   848
val add_trfuns       = extend_sign true (ext_syn Syntax.extend_trfuns) "#";
wenzelm@3975
   849
val add_trfunsT      = extend_sign true (ext_syn Syntax.extend_trfunsT) "#";
wenzelm@3975
   850
val add_tokentrfuns  = extend_sign true (ext_syn Syntax.extend_tokentrfuns) "#";
wenzelm@3975
   851
val add_trrules      = extend_sign true (ext_syn Syntax.extend_trrules) "#";
wenzelm@3975
   852
val add_trrules_i    = extend_sign true (ext_syn Syntax.extend_trrules_i) "#";
wenzelm@3975
   853
val add_path         = extend_sign true ext_path "#";
wenzelm@3975
   854
val add_space        = extend_sign true ext_space "#";
wenzelm@4256
   855
fun init_data arg sg = extend_sign true (ext_init_data sg) "#" arg sg;
wenzelm@4256
   856
fun put_data arg sg  = extend_sign true (ext_put_data sg) "#" arg sg;
wenzelm@3975
   857
fun add_name name sg = extend_sign true K name () sg;
wenzelm@3975
   858
fun prep_ext sg      = extend_sign false K "#" () sg;
wenzelm@386
   859
wenzelm@386
   860
wenzelm@3867
   861
wenzelm@4017
   862
(** merge signatures **)    	(*exception TERM*)
wenzelm@3867
   863
wenzelm@4228
   864
(* merge_stamps *)
wenzelm@4228
   865
wenzelm@4228
   866
fun merge_stamps stamps1 stamps2 =
wenzelm@4228
   867
  let val stamps = merge_rev_lists stamps1 stamps2 in
wenzelm@4228
   868
    (case duplicates (map ! stamps) of
wenzelm@4228
   869
      [] => stamps
wenzelm@4228
   870
    | dups => raise TERM ("Attempt to merge different versions of theories "
wenzelm@4228
   871
        ^ commas_quote dups, []))
wenzelm@4228
   872
  end;
wenzelm@4228
   873
wenzelm@4228
   874
wenzelm@3967
   875
(* merge of sg_refs -- trivial only *)
wenzelm@3877
   876
wenzelm@4228
   877
fun merge_refs (sgr1 as SgRef (Some (ref (sg1 as Sg ({stamps = s1, ...}, _)))),
wenzelm@4228
   878
        sgr2 as SgRef (Some (ref (sg2 as Sg ({stamps = s2, ...}, _))))) =
wenzelm@3967
   879
      if fast_subsig (sg2, sg1) then sgr1
wenzelm@3967
   880
      else if fast_subsig (sg1, sg2) then sgr2
wenzelm@3967
   881
      else if subsig (sg2, sg1) then sgr1
wenzelm@3967
   882
      else if subsig (sg1, sg2) then sgr2
wenzelm@4228
   883
      else (merge_stamps s1 s2; (*check for different versions*)
wenzelm@4228
   884
        raise TERM ("Attempt to do non-trivial merge of signatures", []))
wenzelm@3967
   885
  | merge_refs _ = sys_error "Sign.merge_refs";
wenzelm@3867
   886
wenzelm@3867
   887
wenzelm@3967
   888
(* proper merge *)
wenzelm@143
   889
wenzelm@3967
   890
fun merge_aux (sg1, sg2) =
wenzelm@3967
   891
  if subsig (sg2, sg1) then sg1
wenzelm@251
   892
  else if subsig (sg1, sg2) then sg2
wenzelm@386
   893
  else if is_draft sg1 orelse is_draft sg2 then
wenzelm@3967
   894
    raise TERM ("Attempt to merge draft signatures", [])
wenzelm@251
   895
  else
wenzelm@251
   896
    (*neither is union already; must form union*)
wenzelm@251
   897
    let
wenzelm@3975
   898
      val Sg ({id = _, stamps = stamps1}, {self = _, tsig = tsig1, const_tab = const_tab1,
wenzelm@3975
   899
        syn = syn1, path = _, spaces = spaces1, data = data1}) = sg1;
wenzelm@3975
   900
      val Sg ({id = _, stamps = stamps2}, {self = _, tsig = tsig2, const_tab = const_tab2,
wenzelm@3975
   901
        syn = syn2, path = _, spaces = spaces2, data = data2}) = sg2;
wenzelm@386
   902
wenzelm@3967
   903
      val id = ref "";
wenzelm@3975
   904
      val self_ref = ref sg1;                   (*dummy value*)
wenzelm@3967
   905
      val self = SgRef (Some self_ref);
wenzelm@402
   906
wenzelm@4228
   907
      val stamps = merge_stamps stamps1 stamps2;
wenzelm@2185
   908
      val tsig = Type.merge_tsigs (tsig1, tsig2);
wenzelm@251
   909
      val const_tab = Symtab.merge (op =) (const_tab1, const_tab2)
wenzelm@386
   910
        handle Symtab.DUPS cs =>
wenzelm@3791
   911
          raise TERM ("Incompatible types for constant(s) " ^ commas_quote cs, []);
wenzelm@386
   912
      val syn = Syntax.merge_syntaxes syn1 syn2;
wenzelm@3791
   913
wenzelm@3967
   914
      val path = [];
wenzelm@3791
   915
      val kinds = distinct (map fst (spaces1 @ spaces2));
wenzelm@3791
   916
      val spaces =
wenzelm@3791
   917
        kinds ~~
wenzelm@3791
   918
          ListPair.map NameSpace.merge
wenzelm@3791
   919
            (map (space_of spaces1) kinds, map (space_of spaces2) kinds);
wenzelm@3867
   920
wenzelm@4256
   921
      val data = merge_data (data1, data2);
wenzelm@3967
   922
wenzelm@3967
   923
      val sign = make_sign (id, self, tsig, const_tab, syn, path, spaces, data, stamps);
wenzelm@251
   924
    in
wenzelm@3967
   925
      self_ref := sign; sign
wenzelm@251
   926
    end;
wenzelm@143
   927
wenzelm@3967
   928
fun merge sg1_sg2 =
wenzelm@3967
   929
  (case handle_error merge_aux sg1_sg2 of
wenzelm@3805
   930
    OK sg => sg
wenzelm@3805
   931
  | Error msg => raise TERM (msg, []));
wenzelm@3805
   932
clasohm@0
   933
clasohm@0
   934
wenzelm@3995
   935
(** partial Pure signature **)
clasohm@0
   936
wenzelm@3967
   937
val dummy_sg = make_sign (ref "", SgRef None, Type.tsig0,
wenzelm@4256
   938
  Symtab.null, Syntax.pure_syn, [], [], empty_data, []);
wenzelm@3967
   939
wenzelm@3995
   940
val pre_pure =
wenzelm@3967
   941
  create_sign (SgRef (Some (ref dummy_sg))) [] "#"
wenzelm@4256
   942
    (Syntax.pure_syn, Type.tsig0, Symtab.null, ([], []), empty_data);
clasohm@0
   943
wenzelm@3791
   944
clasohm@0
   945
end;
wenzelm@3791
   946
wenzelm@3791
   947
wenzelm@3791
   948
val long_names = Sign.long_names;