src/Pure/sign.ML
author wenzelm
Fri Jun 05 14:29:33 1998 +0200 (1998-06-05)
changeset 4998 28fe46a570d7
parent 4961 27f559b54c57
child 5175 2dbef0104bcf
permissions -rw-r--r--
improved data: secure version using Object.T and Object.kind;
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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 is_stale: 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 defaultS: sg -> sort
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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 of_sort: sg -> typ * 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 full_name_path: sg -> string -> 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_nonterminals: bstring 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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    (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_trfunsT:
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    (string * (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: (xstring * 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: Object.kind * (Object.T * (Object.T -> Object.T) *
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    (Object.T * Object.T -> Object.T) * (sg -> Object.T -> unit)) -> sg -> sg
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  val get_data: Object.kind -> (Object.T -> 'a) -> sg -> 'a
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  val put_data: Object.kind -> ('a -> Object.T) -> 'a -> sg -> sg
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  val print_data: Object.kind -> sg -> unit
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  val merge_refs: sg_ref * sg_ref -> sg_ref
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  val merge: sg * sg -> sg
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  val prep_ext: sg -> sg
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  val nontriv_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.kind *				(*kind (for authorization)*)
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      (Object.T *				(*value*)
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        ((Object.T -> Object.T) *               (*prepare extend method*)
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          (Object.T * Object.T -> Object.T) *   (*merge and prepare extend method*)
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          (sg -> Object.T -> 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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(* 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 is_stale sg = (check_stale sg; false) handle TERM _ => true;
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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 ord name = ord "#" 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 name :: _, ...}, _)) = name = "" orelse ord name = ord "#";
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(* classes and sorts *)
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val classes = #classes o Type.rep_tsig o tsig_of;
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val defaultS = Type.defaultS 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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fun of_sort (Sg (_, {tsig, ...})) =
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  Sorts.of_sort (#classrel (Type.rep_tsig tsig)) (#arities (Type.rep_tsig tsig));
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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_inconsistent kinds =
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  error ("Attempt to merge different versions of " ^ commas_quote kinds ^ " data");
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fun err_method name kind =
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  error ("Error while invoking " ^ quote kind ^ " " ^ name ^ " method");
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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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fun err_access sg kind =
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  error ("Unauthorized access to " ^ quote kind ^ " data" ^ of_theory sg);
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(* prepare data *)
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val empty_data = Data Symtab.empty;
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fun merge_data (Data tab1, Data tab2) =
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  let
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    val data1 = map snd (Symtab.dest tab1);
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    val data2 = map snd (Symtab.dest tab2);
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    val all_data = data1 @ data2;
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    val kinds = gen_distinct Object.eq_kind (map fst all_data);
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   fun entry data kind =
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     (case gen_assoc Object.eq_kind (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" (Object.name_of_kind 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" (Object.name_of_kind 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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    val data_idx = map (fn (k, x) => (Object.name_of_kind k, (k, x))) data;
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  in
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    Data (Symtab.make data_idx)
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      handle Symtab.DUPS dups => err_inconsistent dups
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  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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  let val name = Object.name_of_kind kind in
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   319
    Data (Symtab.update_new ((name, (kind, (e, (ext, mrg, prt)))), tab))
wenzelm@4998
   320
      handle Symtab.DUP _ => err_dup_init sg name
wenzelm@4998
   321
  end;
wenzelm@4256
   322
wenzelm@4256
   323
wenzelm@4256
   324
(* access data *)
wenzelm@4256
   325
wenzelm@4256
   326
fun data_kinds (Data tab) = map fst (Symtab.dest tab);
wenzelm@4256
   327
wenzelm@4256
   328
fun lookup_data sg tab kind =
wenzelm@4998
   329
  let val name = Object.name_of_kind kind in
wenzelm@4998
   330
    (case Symtab.lookup (tab, name) of
wenzelm@4998
   331
      Some (k, x) =>
wenzelm@4998
   332
        if Object.eq_kind (kind, k) then x
wenzelm@4998
   333
        else err_access sg name
wenzelm@4998
   334
    | None => err_uninit sg name)
wenzelm@4998
   335
  end;
wenzelm@4256
   336
wenzelm@4998
   337
fun get_data kind f (sg as Sg (_, {data = Data tab, ...})) =
wenzelm@4998
   338
  let val x = fst (lookup_data sg tab kind)
wenzelm@4998
   339
  in f x handle Match => Object.kind_error kind end;
wenzelm@4998
   340
wenzelm@4998
   341
fun print_data kind (sg as Sg (_, {data = Data tab, ...})) =
wenzelm@4256
   342
  let val (e, (_, _, prt)) = lookup_data sg tab kind
wenzelm@4998
   343
  in prt sg e handle _ => err_method ("print" ^ of_theory sg) (Object.name_of_kind kind) end;
wenzelm@4256
   344
wenzelm@4998
   345
fun put_data_sg sg (Data tab) kind f x =
wenzelm@4998
   346
  Data (Symtab.update ((Object.name_of_kind kind,
wenzelm@4998
   347
    (kind, (f x, snd (lookup_data sg tab kind)))), tab));
wenzelm@4256
   348
wenzelm@4256
   349
wenzelm@4256
   350
wenzelm@4256
   351
(** build signatures **)
wenzelm@3967
   352
wenzelm@3967
   353
fun ext_stamps stamps (id as ref name) =
wenzelm@3967
   354
  let val stmps = (case stamps of ref "#" :: ss => ss | ss => ss) in
wenzelm@3967
   355
    if exists (equal name o !) stmps then
wenzelm@3967
   356
      error ("Theory already contains a " ^ quote name ^ " component")
wenzelm@3967
   357
    else id :: stmps
wenzelm@3967
   358
  end;
wenzelm@3967
   359
wenzelm@3967
   360
fun create_sign self stamps name (syn, tsig, ctab, (path, spaces), data) =
wenzelm@3967
   361
  let
wenzelm@3967
   362
    val id = ref name;
wenzelm@3967
   363
    val sign =
wenzelm@3967
   364
      make_sign (id, self, tsig, ctab, syn, path, spaces, data, ext_stamps stamps id);
wenzelm@3967
   365
  in
wenzelm@3967
   366
    (case self of
wenzelm@3967
   367
      SgRef (Some r) => r := sign
wenzelm@3967
   368
    | _ => sys_error "Sign.create_sign");
wenzelm@3967
   369
    sign
wenzelm@3967
   370
  end;
wenzelm@3967
   371
wenzelm@3975
   372
fun extend_sign keep extfun name decls
wenzelm@3975
   373
    (sg as Sg ({id = _, stamps}, {self, tsig, const_tab, syn, path, spaces, data})) =
wenzelm@3967
   374
  let
wenzelm@3967
   375
    val _ = check_stale sg;
wenzelm@3967
   376
    val (self', data') =
wenzelm@3975
   377
      if is_draft sg andalso keep then (self, data)
wenzelm@4256
   378
      else (SgRef (Some (ref sg)), prep_ext_data data);
wenzelm@3967
   379
  in
wenzelm@3967
   380
    create_sign self' stamps name
wenzelm@3967
   381
      (extfun (syn, tsig, const_tab, (path, spaces), data') decls)
wenzelm@3967
   382
  end;
wenzelm@3967
   383
wenzelm@3967
   384
wenzelm@3791
   385
wenzelm@3791
   386
(** name spaces **)
wenzelm@3791
   387
wenzelm@3805
   388
(*prune names on output by default*)
wenzelm@3791
   389
val long_names = ref false;
wenzelm@3791
   390
wenzelm@3791
   391
wenzelm@3791
   392
(* kinds *)
wenzelm@3791
   393
wenzelm@3791
   394
val classK = "class";
wenzelm@3791
   395
val typeK = "type";
wenzelm@3791
   396
val constK = "const";
wenzelm@3791
   397
wenzelm@3791
   398
wenzelm@3791
   399
(* add and retrieve names *)
wenzelm@3791
   400
wenzelm@3791
   401
fun space_of spaces kind =
wenzelm@3791
   402
  if_none (assoc (spaces, kind)) NameSpace.empty;
wenzelm@3791
   403
wenzelm@3791
   404
(*input and output of qualified names*)
wenzelm@3995
   405
fun intrn spaces kind = NameSpace.intern (space_of spaces kind);
wenzelm@3995
   406
fun extrn spaces kind = NameSpace.extern (space_of spaces kind);
wenzelm@3791
   407
wenzelm@3791
   408
(*add names*)
wenzelm@3791
   409
fun add_names spaces kind names =
wenzelm@4489
   410
  let val space' = NameSpace.extend (space_of spaces kind, names) in
wenzelm@3791
   411
    overwrite (spaces, (kind, space'))
wenzelm@3791
   412
  end;
wenzelm@3791
   413
wenzelm@3810
   414
(*make full names*)
wenzelm@3937
   415
fun full path name =
wenzelm@4489
   416
  if name = "" then error "Attempt to declare empty name \"\""
wenzelm@4489
   417
  else if NameSpace.qualified name then
wenzelm@3937
   418
    error ("Attempt to declare qualified name " ^ quote name)
wenzelm@3937
   419
  else NameSpace.pack (path @ [name]);
wenzelm@3937
   420
wenzelm@3937
   421
(*base name*)
wenzelm@3937
   422
val base_name = NameSpace.base;
wenzelm@3791
   423
wenzelm@3791
   424
wenzelm@3791
   425
(* intern / extern names *)
wenzelm@3791
   426
wenzelm@3791
   427
local
wenzelm@3791
   428
  (*prepare mapping of names*)
wenzelm@3791
   429
  fun mapping f add_xs t =
wenzelm@3791
   430
    let
wenzelm@3791
   431
      fun f' x = let val y = f x in if x = y then None else Some (x, y) end;
wenzelm@3791
   432
      val table = mapfilter f' (add_xs (t, []));
wenzelm@3791
   433
      fun lookup x = if_none (assoc (table, x)) x;
wenzelm@3791
   434
    in lookup end;
wenzelm@3791
   435
wenzelm@3791
   436
  (*intern / extern typ*)
wenzelm@3791
   437
  fun trn_typ trn T =
wenzelm@3791
   438
    T |> map_typ
wenzelm@3791
   439
      (mapping (trn classK) add_typ_classes T)
wenzelm@3791
   440
      (mapping (trn typeK) add_typ_tycons T);
wenzelm@3791
   441
wenzelm@3791
   442
  (*intern / extern term*)
wenzelm@3791
   443
  fun trn_term trn t =
wenzelm@3791
   444
    t |> map_term
wenzelm@3791
   445
      (mapping (trn classK) add_term_classes t)
wenzelm@3791
   446
      (mapping (trn typeK) add_term_tycons t)
wenzelm@3791
   447
      (mapping (trn constK) add_term_consts t);
wenzelm@3791
   448
wenzelm@3975
   449
  val spaces_of = #spaces o rep_sg;
wenzelm@3791
   450
in
wenzelm@3791
   451
  fun intrn_class spaces = intrn spaces classK;
wenzelm@3791
   452
  fun extrn_class spaces = extrn spaces classK;
wenzelm@3937
   453
wenzelm@3791
   454
  val intrn_sort = map o intrn_class;
wenzelm@3791
   455
  val intrn_typ = trn_typ o intrn;
wenzelm@3937
   456
  val intrn_term = trn_term o intrn;
wenzelm@3937
   457
wenzelm@3937
   458
  val extrn_sort = map o extrn_class;
wenzelm@3791
   459
  val extrn_typ = trn_typ o extrn;
wenzelm@3791
   460
  val extrn_term = trn_term o extrn;
wenzelm@3791
   461
wenzelm@3805
   462
  fun intrn_tycons spaces T =
wenzelm@3805
   463
    map_typ I (mapping (intrn spaces typeK) add_typ_tycons T) T;
wenzelm@3805
   464
wenzelm@3810
   465
  val intern = intrn o spaces_of;
wenzelm@3855
   466
  val extern = extrn o spaces_of;
wenzelm@3937
   467
  fun cond_extern sg kind = if ! long_names then I else extern sg kind;
wenzelm@3937
   468
wenzelm@3791
   469
  val intern_class = intrn_class o spaces_of;
wenzelm@3791
   470
  val intern_sort = intrn_sort o spaces_of;
wenzelm@3791
   471
  val intern_typ = intrn_typ o spaces_of;
wenzelm@3791
   472
  val intern_term = intrn_term o spaces_of;
wenzelm@3791
   473
wenzelm@3791
   474
  fun intern_tycon sg = intrn (spaces_of sg) typeK;
wenzelm@3791
   475
  fun intern_const sg = intrn (spaces_of sg) constK;
wenzelm@3937
   476
wenzelm@3791
   477
  val intern_tycons = intrn_tycons o spaces_of;
wenzelm@3791
   478
wenzelm@3975
   479
  val full_name = full o #path o rep_sg;
wenzelm@4908
   480
  fun full_name_path sg elems name =
wenzelm@4844
   481
    full (#path (rep_sg sg) @ NameSpace.unpack elems) name;
wenzelm@3791
   482
end;
wenzelm@620
   483
wenzelm@402
   484
clasohm@0
   485
wenzelm@4249
   486
(** pretty printing of terms, types etc. **)
wenzelm@3937
   487
wenzelm@4249
   488
fun pretty_term (sg as Sg ({stamps, ...}, {syn, spaces, ...})) t =
wenzelm@3937
   489
  Syntax.pretty_term syn
wenzelm@4249
   490
    (exists (equal "CPure" o !) stamps)
wenzelm@3937
   491
    (if ! long_names then t else extrn_term spaces t);
wenzelm@3937
   492
wenzelm@3975
   493
fun pretty_typ (Sg (_, {syn, spaces, ...})) T =
wenzelm@3937
   494
  Syntax.pretty_typ syn
wenzelm@3937
   495
    (if ! long_names then T else extrn_typ spaces T);
wenzelm@3937
   496
wenzelm@3975
   497
fun pretty_sort (Sg (_, {syn, spaces, ...})) S =
wenzelm@3937
   498
  Syntax.pretty_sort syn
wenzelm@3937
   499
    (if ! long_names then S else extrn_sort spaces S);
wenzelm@3937
   500
wenzelm@3937
   501
fun pretty_classrel sg (c1, c2) = Pretty.block
wenzelm@3937
   502
  [pretty_sort sg [c1], Pretty.str " <", Pretty.brk 1, pretty_sort sg [c2]];
wenzelm@3937
   503
wenzelm@3937
   504
fun pretty_arity sg (t, Ss, S) =
wenzelm@3937
   505
  let
wenzelm@3937
   506
    val t' = cond_extern sg typeK t;
wenzelm@3937
   507
    val dom =
wenzelm@3937
   508
      if null Ss then []
wenzelm@3937
   509
      else [Pretty.list "(" ")" (map (pretty_sort sg) Ss), Pretty.brk 1];
wenzelm@3937
   510
  in
wenzelm@3937
   511
    Pretty.block
wenzelm@3937
   512
      ([Pretty.str (t' ^ " ::"), Pretty.brk 1] @ dom @ [pretty_sort sg S])
wenzelm@3937
   513
  end;
wenzelm@3937
   514
wenzelm@3937
   515
fun string_of_term sg t = Pretty.string_of (pretty_term sg t);
wenzelm@3937
   516
fun string_of_typ sg T = Pretty.string_of (pretty_typ sg T);
wenzelm@3937
   517
fun string_of_sort sg S = Pretty.string_of (pretty_sort sg S);
wenzelm@3937
   518
wenzelm@3937
   519
fun str_of_sort sg S = Pretty.str_of (pretty_sort sg S);
wenzelm@3937
   520
fun str_of_classrel sg c1_c2 = Pretty.str_of (pretty_classrel sg c1_c2);
wenzelm@3937
   521
fun str_of_arity sg ar = Pretty.str_of (pretty_arity sg ar);
wenzelm@3937
   522
wenzelm@3937
   523
fun pprint_term sg = Pretty.pprint o Pretty.quote o (pretty_term sg);
wenzelm@3937
   524
fun pprint_typ sg = Pretty.pprint o Pretty.quote o (pretty_typ sg);
wenzelm@3937
   525
wenzelm@3937
   526
wenzelm@3937
   527
wenzelm@562
   528
(** read types **)  (*exception ERROR*)
wenzelm@562
   529
wenzelm@562
   530
fun err_in_type s =
wenzelm@562
   531
  error ("The error(s) above occurred in type " ^ quote s);
wenzelm@562
   532
wenzelm@4227
   533
fun rd_raw_typ syn tsig spaces def_sort str =
wenzelm@3791
   534
  intrn_tycons spaces
wenzelm@3791
   535
    (Syntax.read_typ syn (Type.get_sort tsig def_sort (intrn_sort spaces)) str
wenzelm@3791
   536
      handle ERROR => err_in_type str);
wenzelm@4227
   537
wenzelm@4227
   538
fun read_raw_typ (sg as Sg (_, {tsig, syn, spaces, ...}), def_sort) str =
wenzelm@4227
   539
  (check_stale sg; rd_raw_typ syn tsig spaces def_sort str);
wenzelm@4227
   540
wenzelm@562
   541
(*read and certify typ wrt a signature*)
wenzelm@4227
   542
fun read_typ (sg, def_sort) str =
wenzelm@4227
   543
  (Type.cert_typ (tsig_of sg) (read_raw_typ (sg, def_sort) str)
wenzelm@3969
   544
      handle TYPE (msg, _, _) => (error_msg msg; err_in_type str));
wenzelm@562
   545
wenzelm@562
   546
wenzelm@562
   547
wenzelm@386
   548
(** certify types and terms **)   (*exception TYPE*)
wenzelm@251
   549
wenzelm@4961
   550
(* certify_typ *)
wenzelm@4961
   551
wenzelm@3975
   552
val certify_typ = Type.cert_typ o tsig_of;
wenzelm@251
   553
wenzelm@4961
   554
wenzelm@4961
   555
(* certify_term *)
wenzelm@4961
   556
wenzelm@2979
   557
(*check for duplicate TVars with distinct sorts*)
wenzelm@2979
   558
fun nodup_TVars (tvars, T) =
wenzelm@2979
   559
  (case T of
wenzelm@2979
   560
    Type (_, Ts) => nodup_TVars_list (tvars, Ts)
wenzelm@2979
   561
  | TFree _ => tvars
wenzelm@2979
   562
  | TVar (v as (a, S)) =>
wenzelm@2979
   563
      (case assoc_string_int (tvars, a) of
wenzelm@2979
   564
        Some S' =>
wenzelm@2979
   565
          if S = S' then tvars
wenzelm@3791
   566
          else raise TYPE ("Type variable " ^ Syntax.string_of_vname a ^
wenzelm@3791
   567
            " has two distinct sorts", [TVar (a, S'), T], [])
wenzelm@2979
   568
      | None => v :: tvars))
wenzelm@2979
   569
(*equivalent to foldl nodup_TVars_list, but 3X faster under Poly/ML*)
wenzelm@2979
   570
and nodup_TVars_list (tvars, []) = tvars
wenzelm@2979
   571
  | nodup_TVars_list (tvars, T :: Ts) =
wenzelm@2979
   572
      nodup_TVars_list (nodup_TVars (tvars, T), Ts);
nipkow@1494
   573
wenzelm@2979
   574
(*check for duplicate Vars with distinct types*)
nipkow@1494
   575
fun nodup_Vars tm =
wenzelm@2979
   576
  let
wenzelm@2979
   577
    fun nodups vars tvars tm =
wenzelm@2979
   578
      (case tm of
wenzelm@2979
   579
        Const (c, T) => (vars, nodup_TVars (tvars, T))
wenzelm@2979
   580
      | Free (a, T) => (vars, nodup_TVars (tvars, T))
wenzelm@2979
   581
      | Var (v as (ixn, T)) =>
wenzelm@2979
   582
          (case assoc_string_int (vars, ixn) of
wenzelm@2979
   583
            Some T' =>
wenzelm@2979
   584
              if T = T' then (vars, nodup_TVars (tvars, T))
wenzelm@3791
   585
              else raise TYPE ("Variable " ^ Syntax.string_of_vname ixn ^
wenzelm@3791
   586
                " has two distinct types", [T', T], [])
wenzelm@2979
   587
          | None => (v :: vars, tvars))
wenzelm@2979
   588
      | Bound _ => (vars, tvars)
wenzelm@3791
   589
      | Abs (_, T, t) => nodups vars (nodup_TVars (tvars, T)) t
wenzelm@2979
   590
      | s $ t =>
wenzelm@2979
   591
          let val (vars',tvars') = nodups vars tvars s in
wenzelm@2979
   592
            nodups vars' tvars' t
wenzelm@2979
   593
          end);
wenzelm@2979
   594
  in nodups [] [] tm; () end;
wenzelm@2979
   595
wenzelm@4961
   596
(*compute and check type of the term*)
wenzelm@4961
   597
fun type_check sg tm =
wenzelm@4961
   598
  let
wenzelm@4961
   599
    val prt =
wenzelm@4961
   600
      setmp Syntax.show_brackets true
wenzelm@4961
   601
        (setmp long_names true (pretty_term sg));
wenzelm@4961
   602
    val prT = setmp long_names true (pretty_typ sg);
wenzelm@251
   603
wenzelm@4961
   604
    fun err_appl why bs t T u U =
wenzelm@4961
   605
      let
wenzelm@4961
   606
        val xs = map Free bs;		(*we do not rename here*)
wenzelm@4961
   607
        val t' = subst_bounds (xs, t);
wenzelm@4961
   608
        val u' = subst_bounds (xs, u);
wenzelm@4961
   609
        val text = cat_lines
wenzelm@4961
   610
         ["Type error in application: " ^ why,
wenzelm@4961
   611
          "",
wenzelm@4961
   612
          Pretty.string_of (Pretty.block [Pretty.str "Operator:", Pretty.brk 2, prt t',
wenzelm@4961
   613
            Pretty.str " :: ", prT T]),
wenzelm@4961
   614
          Pretty.string_of (Pretty.block [Pretty.str "Operand:", Pretty.brk 3, prt u',
wenzelm@4961
   615
            Pretty.str " :: ", prT U]), ""];
wenzelm@4961
   616
      in raise TYPE (text, [T, U], [t', u']) end;
wenzelm@4961
   617
wenzelm@4961
   618
    fun typ_of (_, Const (_, T)) = T
wenzelm@4961
   619
      | typ_of (_, Free  (_, T)) = T
wenzelm@4961
   620
      | typ_of (_, Var (_, T)) = T
wenzelm@4961
   621
      | typ_of (bs, Bound i) = snd (nth_elem (i, bs) handle LIST _ =>
wenzelm@4961
   622
          raise TYPE ("Loose bound variable: B." ^ string_of_int i, [], [Bound i]))
wenzelm@4961
   623
      | typ_of (bs, Abs (x, T, body)) = T --> typ_of ((x, T) :: bs, body)
wenzelm@4961
   624
      | typ_of (bs, t $ u) =
wenzelm@4961
   625
          let val T = typ_of (bs, t) and U = typ_of (bs, u) in
wenzelm@4961
   626
            (case T of
wenzelm@4961
   627
              Type ("fun", [T1, T2]) =>
wenzelm@4961
   628
                if T1 = U then T2 else err_appl "Incompatible operand type." bs t T u U
wenzelm@4961
   629
            | _ => err_appl "Operator not of function type." bs t T u U)
wenzelm@4961
   630
          end;
wenzelm@4961
   631
wenzelm@4961
   632
  in typ_of ([], tm) end;
clasohm@0
   633
wenzelm@2979
   634
wenzelm@3975
   635
fun certify_term sg tm =
wenzelm@251
   636
  let
wenzelm@3969
   637
    val _ = check_stale sg;
wenzelm@3975
   638
    val tsig = tsig_of sg;
wenzelm@3969
   639
wenzelm@3975
   640
    fun show_const a T = quote a ^ " :: " ^ quote (string_of_typ sg T);
wenzelm@169
   641
wenzelm@4961
   642
    fun atom_err (errs, Const (a, T)) =
wenzelm@3975
   643
        (case const_type sg a of
wenzelm@4961
   644
          None => ("Undeclared constant " ^ show_const a T) :: errs
wenzelm@3975
   645
        | Some U =>
wenzelm@4961
   646
            if Type.typ_instance (tsig, T, U) then errs
wenzelm@4961
   647
            else ("Illegal type for constant " ^ show_const a T) :: errs)
wenzelm@4961
   648
      | atom_err (errs, Var ((x, i), _)) =
wenzelm@4961
   649
          if i < 0 then ("Negative index for Var " ^ quote x) :: errs else errs
wenzelm@4961
   650
      | atom_err (errs, _) = errs;
wenzelm@251
   651
wenzelm@251
   652
    val norm_tm =
wenzelm@2185
   653
      (case it_term_types (Type.typ_errors tsig) (tm, []) of
wenzelm@2185
   654
        [] => map_term_types (Type.norm_typ tsig) tm
wenzelm@3791
   655
      | errs => raise TYPE (cat_lines errs, [], [tm]));
nipkow@1494
   656
    val _ = nodup_Vars norm_tm;
wenzelm@251
   657
  in
wenzelm@4961
   658
    (case foldl_aterms atom_err ([], norm_tm) of
wenzelm@4961
   659
      [] => (norm_tm, type_check sg norm_tm, maxidx_of_term norm_tm)
wenzelm@3791
   660
    | errs => raise TYPE (cat_lines errs, [], [norm_tm]))
wenzelm@251
   661
  end;
wenzelm@251
   662
wenzelm@251
   663
wenzelm@251
   664
wenzelm@583
   665
(** infer_types **)         (*exception ERROR*)
wenzelm@251
   666
wenzelm@2979
   667
(*
wenzelm@2979
   668
  def_type: partial map from indexnames to types (constrains Frees, Vars)
wenzelm@2979
   669
  def_sort: partial map from indexnames to sorts (constrains TFrees, TVars)
wenzelm@2979
   670
  used: list of already used type variables
wenzelm@2979
   671
  freeze: if true then generated parameters are turned into TFrees, else TVars
wenzelm@4249
   672
wenzelm@4249
   673
  termss: lists of alternative parses (only one combination should be type-correct)
wenzelm@4249
   674
  typs: expected types
wenzelm@2979
   675
*)
wenzelm@2979
   676
wenzelm@4249
   677
fun infer_types_simult sg def_type def_sort used freeze args =
wenzelm@251
   678
  let
wenzelm@3975
   679
    val tsig = tsig_of sg;
wenzelm@3810
   680
    val prt =
wenzelm@3810
   681
      setmp Syntax.show_brackets true
wenzelm@3810
   682
        (setmp long_names true (pretty_term sg));
wenzelm@3810
   683
    val prT = setmp long_names true (pretty_typ sg);
wenzelm@4249
   684
wenzelm@4249
   685
    val termss = foldr multiply (map fst args, [[]]);
wenzelm@4249
   686
    val typs =
wenzelm@4249
   687
      map (fn (_, T) => certify_typ sg T handle TYPE (msg, _, _) => error msg) args;
wenzelm@169
   688
wenzelm@4249
   689
    fun infer ts = OK
wenzelm@4249
   690
      (Type.infer_types prt prT tsig (const_type sg) def_type def_sort
wenzelm@4249
   691
        (intern_const sg) (intern_tycons sg) (intern_sort sg) used freeze typs ts)
wenzelm@4249
   692
      handle TYPE (msg, _, _) => Error msg;
clasohm@623
   693
wenzelm@4249
   694
    val err_results = map infer termss;
wenzelm@4249
   695
    val errs = mapfilter get_error err_results;
wenzelm@4249
   696
    val results = mapfilter get_ok err_results;
wenzelm@4249
   697
wenzelm@4249
   698
    val ambiguity = length termss;	(* FIXME !? *)
wenzelm@4249
   699
    (* FIXME to syntax.ML!? *)
wenzelm@4249
   700
    fun ambig_msg () =
wenzelm@4249
   701
      if ambiguity > 1 andalso ambiguity <= ! Syntax.ambiguity_level
wenzelm@4249
   702
      then
wenzelm@4249
   703
        error_msg "Got more than one parse tree.\n\
wenzelm@3805
   704
          \Retry with smaller Syntax.ambiguity_level for more information."
nipkow@952
   705
      else ();
wenzelm@4249
   706
  in
wenzelm@4249
   707
    if null results then (ambig_msg (); error (cat_lines errs))
wenzelm@4249
   708
    else if length results = 1 then
wenzelm@4249
   709
      (if ambiguity > ! Syntax.ambiguity_level then
wenzelm@4249
   710
        warning "Fortunately, only one parse tree is type correct.\n\
wenzelm@4249
   711
          \You may still want to disambiguate your grammar or your input."
wenzelm@4249
   712
      else (); hd results)
wenzelm@4249
   713
    else (ambig_msg (); error ("More than one term is type correct:\n" ^
wenzelm@4249
   714
      (cat_lines (map (Pretty.string_of o prt) (flat (map fst results))))))
wenzelm@4249
   715
  end;
clasohm@623
   716
wenzelm@4249
   717
wenzelm@4249
   718
fun infer_types sg def_type def_sort used freeze tsT =
wenzelm@4249
   719
  apfst hd (infer_types_simult sg def_type def_sort used freeze [tsT]);
wenzelm@251
   720
wenzelm@251
   721
wenzelm@2979
   722
clasohm@623
   723
(** extend signature **)    (*exception ERROR*)
clasohm@623
   724
wenzelm@620
   725
(** signature extension functions **)  (*exception ERROR*)
wenzelm@386
   726
wenzelm@3791
   727
fun decls_of path name_of mfixs =
wenzelm@3810
   728
  map (fn (x, y, mx) => (full path (name_of x mx), y)) mfixs;
wenzelm@3791
   729
wenzelm@3791
   730
fun no_read _ _ _ decl = decl;
wenzelm@386
   731
wenzelm@386
   732
wenzelm@386
   733
(* add default sort *)
wenzelm@386
   734
wenzelm@3967
   735
fun ext_defsort int (syn, tsig, ctab, (path, spaces), data) S =
wenzelm@3791
   736
  (syn, Type.ext_tsig_defsort tsig (if int then intrn_sort spaces S else S),
wenzelm@3967
   737
    ctab, (path, spaces), data);
wenzelm@386
   738
wenzelm@386
   739
wenzelm@386
   740
(* add type constructors *)
wenzelm@386
   741
wenzelm@3967
   742
fun ext_types (syn, tsig, ctab, (path, spaces), data) types =
wenzelm@3791
   743
  let val decls = decls_of path Syntax.type_name types in
wenzelm@3791
   744
    (Syntax.extend_type_gram syn types,
wenzelm@3791
   745
      Type.ext_tsig_types tsig decls, ctab,
wenzelm@3967
   746
      (path, add_names spaces typeK (map fst decls)), data)
wenzelm@3791
   747
  end;
wenzelm@386
   748
wenzelm@4844
   749
fun ext_nonterminals sg nonterms =
wenzelm@4844
   750
  ext_types sg (map (fn n => (n, 0, Syntax.NoSyn)) nonterms);
wenzelm@4844
   751
wenzelm@386
   752
wenzelm@386
   753
(* add type abbreviations *)
wenzelm@386
   754
wenzelm@3791
   755
fun read_abbr syn tsig spaces (t, vs, rhs_src) =
wenzelm@4227
   756
  (t, vs, rd_raw_typ syn tsig spaces (K None) rhs_src)
wenzelm@386
   757
    handle ERROR => error ("in type abbreviation " ^ t);
wenzelm@386
   758
wenzelm@3967
   759
fun ext_abbrs rd_abbr (syn, tsig, ctab, (path, spaces), data) abbrs =
wenzelm@386
   760
  let
wenzelm@386
   761
    fun mfix_of (t, vs, _, mx) = (t, length vs, mx);
wenzelm@3791
   762
    val syn' = Syntax.extend_type_gram syn (map mfix_of abbrs);
wenzelm@386
   763
wenzelm@3791
   764
    val abbrs' =
wenzelm@3791
   765
      map (fn (t, vs, rhs, mx) =>
wenzelm@3810
   766
        (full path (Syntax.type_name t mx), vs, rhs)) abbrs;
wenzelm@3805
   767
    val spaces' = add_names spaces typeK (map #1 abbrs');
wenzelm@3805
   768
    val decls = map (rd_abbr syn' tsig spaces') abbrs';
wenzelm@386
   769
  in
wenzelm@3967
   770
    (syn', Type.ext_tsig_abbrs tsig decls, ctab, (path, spaces'), data)
wenzelm@386
   771
  end;
wenzelm@386
   772
wenzelm@3791
   773
fun ext_tyabbrs abbrs = ext_abbrs read_abbr abbrs;
wenzelm@3791
   774
fun ext_tyabbrs_i abbrs = ext_abbrs no_read abbrs;
wenzelm@386
   775
wenzelm@386
   776
wenzelm@386
   777
(* add type arities *)
wenzelm@386
   778
wenzelm@3967
   779
fun ext_arities int (syn, tsig, ctab, (path, spaces), data) arities =
wenzelm@386
   780
  let
wenzelm@3791
   781
    fun intrn_arity (c, Ss, S) =
wenzelm@3791
   782
      (intrn spaces typeK c, map (intrn_sort spaces) Ss, intrn_sort spaces S);
wenzelm@3791
   783
    val intrn = if int then map intrn_arity else I;
wenzelm@3791
   784
    val tsig' = Type.ext_tsig_arities tsig (intrn arities);
wenzelm@3791
   785
    val log_types = Type.logical_types tsig';
wenzelm@386
   786
  in
wenzelm@3967
   787
    (Syntax.extend_log_types syn log_types, tsig', ctab, (path, spaces), data)
wenzelm@386
   788
  end;
wenzelm@386
   789
wenzelm@386
   790
wenzelm@386
   791
(* add term constants and syntax *)
wenzelm@386
   792
wenzelm@3805
   793
fun const_name path c mx =
wenzelm@3810
   794
  full path (Syntax.const_name c mx);
wenzelm@3805
   795
wenzelm@386
   796
fun err_in_const c =
wenzelm@386
   797
  error ("in declaration of constant " ^ quote c);
wenzelm@386
   798
wenzelm@386
   799
fun err_dup_consts cs =
wenzelm@386
   800
  error ("Duplicate declaration of constant(s) " ^ commas_quote cs);
wenzelm@386
   801
wenzelm@251
   802
wenzelm@3805
   803
fun read_const syn tsig (path, spaces) (c, ty_src, mx) =
wenzelm@4227
   804
  (c, rd_raw_typ syn tsig spaces (K None) ty_src, mx)
wenzelm@3805
   805
    handle ERROR => err_in_const (const_name path c mx);
wenzelm@386
   806
wenzelm@3967
   807
fun ext_cnsts rd_const syn_only prmode (syn, tsig, ctab, (path, spaces), data) raw_consts =
wenzelm@386
   808
  let
wenzelm@2979
   809
    fun prep_const (c, ty, mx) =
wenzelm@3791
   810
      (c, compress_type (Type.varifyT (Type.cert_typ tsig (Type.no_tvars ty))), mx)
wenzelm@3791
   811
        handle TYPE (msg, _, _) =>
wenzelm@3805
   812
          (error_msg msg; err_in_const (const_name path c mx));
wenzelm@386
   813
wenzelm@3805
   814
    val consts = map (prep_const o rd_const syn tsig (path, spaces)) raw_consts;
wenzelm@386
   815
    val decls =
wenzelm@386
   816
      if syn_only then []
wenzelm@3791
   817
      else decls_of path Syntax.const_name consts;
wenzelm@386
   818
  in
wenzelm@2197
   819
    (Syntax.extend_const_gram syn prmode consts, tsig,
wenzelm@4489
   820
      Symtab.extend (ctab, decls)
wenzelm@3791
   821
        handle Symtab.DUPS cs => err_dup_consts cs,
wenzelm@3967
   822
      (path, add_names spaces constK (map fst decls)), data)
wenzelm@386
   823
  end;
wenzelm@386
   824
wenzelm@4007
   825
fun ext_consts_i sg = ext_cnsts no_read false ("", true) sg;
wenzelm@4007
   826
fun ext_consts sg = ext_cnsts read_const false ("", true) sg;
wenzelm@4007
   827
fun ext_syntax_i sg = ext_cnsts no_read true ("", true) sg;
wenzelm@4007
   828
fun ext_syntax sg = ext_cnsts read_const true ("", true) sg;
wenzelm@3791
   829
fun ext_modesyntax_i sg (prmode, consts) = ext_cnsts no_read true prmode sg consts;
wenzelm@2197
   830
fun ext_modesyntax sg (prmode, consts) = ext_cnsts read_const true prmode sg consts;
wenzelm@386
   831
wenzelm@386
   832
wenzelm@386
   833
(* add type classes *)
wenzelm@386
   834
wenzelm@386
   835
fun const_of_class c = c ^ "_class";
wenzelm@386
   836
wenzelm@386
   837
fun class_of_const c_class =
wenzelm@386
   838
  let
wenzelm@3791
   839
    val c = implode (take (size c_class - size "_class", explode c_class));
wenzelm@386
   840
  in
wenzelm@386
   841
    if const_of_class c = c_class then c
wenzelm@3791
   842
    else raise TERM ("class_of_const: bad name " ^ quote c_class, [])
wenzelm@386
   843
  end;
wenzelm@386
   844
wenzelm@386
   845
wenzelm@3967
   846
fun ext_classes int (syn, tsig, ctab, (path, spaces), data) classes =
wenzelm@386
   847
  let
wenzelm@562
   848
    val names = map fst classes;
wenzelm@386
   849
    val consts =
wenzelm@386
   850
      map (fn c => (const_of_class c, a_itselfT --> propT, NoSyn)) names;
wenzelm@3791
   851
wenzelm@3810
   852
    val full_names = map (full path) names;
wenzelm@3791
   853
    val spaces' = add_names spaces classK full_names;
wenzelm@3791
   854
    val intrn = if int then map (intrn_class spaces') else I;
wenzelm@3791
   855
    val classes' =
wenzelm@3791
   856
      ListPair.map (fn (c, (_, cs)) => (c, intrn cs)) (full_names, classes);
wenzelm@386
   857
  in
wenzelm@386
   858
    ext_consts_i
wenzelm@3791
   859
      (Syntax.extend_consts syn names,
wenzelm@3967
   860
        Type.ext_tsig_classes tsig classes', ctab, (path, spaces'), data)
wenzelm@3791
   861
    consts
wenzelm@386
   862
  end;
wenzelm@386
   863
wenzelm@386
   864
wenzelm@2963
   865
(* add to classrel *)
wenzelm@421
   866
wenzelm@3967
   867
fun ext_classrel int (syn, tsig, ctab, (path, spaces), data) pairs =
wenzelm@3791
   868
  let val intrn = if int then map (pairself (intrn_class spaces)) else I in
wenzelm@3967
   869
    (syn, Type.ext_tsig_classrel tsig (intrn pairs), ctab, (path, spaces), data)
wenzelm@3791
   870
  end;
wenzelm@421
   871
wenzelm@421
   872
wenzelm@4619
   873
(* add translation rules *)
wenzelm@4619
   874
wenzelm@4619
   875
fun ext_trrules (syn, tsig, ctab, (path, spaces), data) args =
wenzelm@4619
   876
  (Syntax.extend_trrules syn
wenzelm@4619
   877
    (map (Syntax.map_trrule (fn (root, str) => (intrn spaces typeK root, str))) args),
wenzelm@4619
   878
      tsig, ctab, (path, spaces), data);
wenzelm@4619
   879
wenzelm@4619
   880
wenzelm@1159
   881
(* add to syntax *)
wenzelm@386
   882
wenzelm@3967
   883
fun ext_syn extfun (syn, tsig, ctab, names, data) args =
wenzelm@3967
   884
  (extfun syn args, tsig, ctab, names, data);
wenzelm@3791
   885
wenzelm@3791
   886
wenzelm@3791
   887
(* add to path *)
wenzelm@3791
   888
wenzelm@4844
   889
fun ext_path (syn, tsig, ctab, (path, spaces), data) elems =
wenzelm@3791
   890
  let
wenzelm@3791
   891
    val path' =
wenzelm@4844
   892
      if elems = ".." andalso not (null path) then fst (split_last path)
wenzelm@4844
   893
      else if elems = "/" then []
wenzelm@4844
   894
      else path @ NameSpace.unpack elems;
wenzelm@3791
   895
  in
wenzelm@3967
   896
    (syn, tsig, ctab, (path', spaces), data)
wenzelm@3791
   897
  end;      
wenzelm@3791
   898
wenzelm@3791
   899
wenzelm@3791
   900
(* add to name space *)
wenzelm@3791
   901
wenzelm@3967
   902
fun ext_space (syn, tsig, ctab, (path, spaces), data) (kind, names) =
wenzelm@3967
   903
  (syn, tsig, ctab, (path, add_names spaces kind names), data);
wenzelm@386
   904
wenzelm@386
   905
wenzelm@3967
   906
(* signature data *)
wenzelm@386
   907
wenzelm@4256
   908
fun ext_init_data sg (syn, tsig, ctab, names, data) (kind, (e, ext, mrg, prt)) =
wenzelm@4256
   909
  (syn, tsig, ctab, names, init_data_sg sg data kind e ext mrg prt);
wenzelm@386
   910
wenzelm@4998
   911
fun ext_put_data sg (syn, tsig, ctab, names, data) (kind, f, x) =
wenzelm@4998
   912
  (syn, tsig, ctab, names, put_data_sg sg data kind f x);
wenzelm@386
   913
wenzelm@386
   914
wenzelm@386
   915
(* the external interfaces *)
wenzelm@386
   916
wenzelm@4998
   917
val add_classes       = extend_sign true (ext_classes true) "#";
wenzelm@4998
   918
val add_classes_i     = extend_sign true (ext_classes false) "#";
wenzelm@4998
   919
val add_classrel      = extend_sign true (ext_classrel true) "#";
wenzelm@4998
   920
val add_classrel_i    = extend_sign true (ext_classrel false) "#";
wenzelm@4998
   921
val add_defsort       = extend_sign true (ext_defsort true) "#";
wenzelm@4998
   922
val add_defsort_i     = extend_sign true (ext_defsort false) "#";
wenzelm@4998
   923
val add_types         = extend_sign true ext_types "#";
wenzelm@4998
   924
val add_nonterminals  = extend_sign true ext_nonterminals "#";
wenzelm@4998
   925
val add_tyabbrs       = extend_sign true ext_tyabbrs "#";
wenzelm@4998
   926
val add_tyabbrs_i     = extend_sign true ext_tyabbrs_i "#";
wenzelm@4998
   927
val add_arities       = extend_sign true (ext_arities true) "#";
wenzelm@4998
   928
val add_arities_i     = extend_sign true (ext_arities false) "#";
wenzelm@4998
   929
val add_consts        = extend_sign true ext_consts "#";
wenzelm@4998
   930
val add_consts_i      = extend_sign true ext_consts_i "#";
wenzelm@4998
   931
val add_syntax        = extend_sign true ext_syntax "#";
wenzelm@4998
   932
val add_syntax_i      = extend_sign true ext_syntax_i "#";
wenzelm@4998
   933
val add_modesyntax    = extend_sign true ext_modesyntax "#";
wenzelm@4998
   934
val add_modesyntax_i  = extend_sign true ext_modesyntax_i "#";
wenzelm@4998
   935
val add_trfuns        = extend_sign true (ext_syn Syntax.extend_trfuns) "#";
wenzelm@4998
   936
val add_trfunsT       = extend_sign true (ext_syn Syntax.extend_trfunsT) "#";
wenzelm@4998
   937
val add_tokentrfuns   = extend_sign true (ext_syn Syntax.extend_tokentrfuns) "#";
wenzelm@4998
   938
val add_trrules       = extend_sign true ext_trrules "#";
wenzelm@4998
   939
val add_trrules_i     = extend_sign true (ext_syn Syntax.extend_trrules_i) "#";
wenzelm@4998
   940
val add_path          = extend_sign true ext_path "#";
wenzelm@4998
   941
val add_space         = extend_sign true ext_space "#";
wenzelm@4998
   942
fun init_data arg sg  = extend_sign true (ext_init_data sg) "#" arg sg;
wenzelm@4998
   943
fun put_data k f x sg = extend_sign true (ext_put_data sg) "#" (k, f, x) sg;
wenzelm@4998
   944
fun add_name name sg  = extend_sign true K name () sg;
wenzelm@4998
   945
fun prep_ext sg       = extend_sign false K "#" () sg;
wenzelm@386
   946
wenzelm@386
   947
wenzelm@3867
   948
wenzelm@4017
   949
(** merge signatures **)    	(*exception TERM*)
wenzelm@3867
   950
wenzelm@4228
   951
(* merge_stamps *)
wenzelm@4228
   952
wenzelm@4228
   953
fun merge_stamps stamps1 stamps2 =
wenzelm@4228
   954
  let val stamps = merge_rev_lists stamps1 stamps2 in
wenzelm@4228
   955
    (case duplicates (map ! stamps) of
wenzelm@4228
   956
      [] => stamps
wenzelm@4228
   957
    | dups => raise TERM ("Attempt to merge different versions of theories "
wenzelm@4228
   958
        ^ commas_quote dups, []))
wenzelm@4228
   959
  end;
wenzelm@4228
   960
wenzelm@4228
   961
wenzelm@4627
   962
(* implicit merge -- trivial only *)
wenzelm@3877
   963
wenzelm@4228
   964
fun merge_refs (sgr1 as SgRef (Some (ref (sg1 as Sg ({stamps = s1, ...}, _)))),
wenzelm@4228
   965
        sgr2 as SgRef (Some (ref (sg2 as Sg ({stamps = s2, ...}, _))))) =
wenzelm@3967
   966
      if fast_subsig (sg2, sg1) then sgr1
wenzelm@3967
   967
      else if fast_subsig (sg1, sg2) then sgr2
wenzelm@3967
   968
      else if subsig (sg2, sg1) then sgr1
wenzelm@3967
   969
      else if subsig (sg1, sg2) then sgr2
wenzelm@4228
   970
      else (merge_stamps s1 s2; (*check for different versions*)
wenzelm@4228
   971
        raise TERM ("Attempt to do non-trivial merge of signatures", []))
wenzelm@3967
   972
  | merge_refs _ = sys_error "Sign.merge_refs";
wenzelm@3867
   973
wenzelm@4627
   974
val merge = deref o merge_refs o pairself self_ref;
wenzelm@4627
   975
wenzelm@3867
   976
wenzelm@3967
   977
(* proper merge *)
wenzelm@143
   978
wenzelm@3967
   979
fun merge_aux (sg1, sg2) =
wenzelm@3967
   980
  if subsig (sg2, sg1) then sg1
wenzelm@251
   981
  else if subsig (sg1, sg2) then sg2
wenzelm@386
   982
  else if is_draft sg1 orelse is_draft sg2 then
wenzelm@3967
   983
    raise TERM ("Attempt to merge draft signatures", [])
wenzelm@251
   984
  else
wenzelm@251
   985
    (*neither is union already; must form union*)
wenzelm@251
   986
    let
wenzelm@3975
   987
      val Sg ({id = _, stamps = stamps1}, {self = _, tsig = tsig1, const_tab = const_tab1,
wenzelm@3975
   988
        syn = syn1, path = _, spaces = spaces1, data = data1}) = sg1;
wenzelm@3975
   989
      val Sg ({id = _, stamps = stamps2}, {self = _, tsig = tsig2, const_tab = const_tab2,
wenzelm@3975
   990
        syn = syn2, path = _, spaces = spaces2, data = data2}) = sg2;
wenzelm@386
   991
wenzelm@3967
   992
      val id = ref "";
wenzelm@3975
   993
      val self_ref = ref sg1;                   (*dummy value*)
wenzelm@3967
   994
      val self = SgRef (Some self_ref);
wenzelm@402
   995
wenzelm@4228
   996
      val stamps = merge_stamps stamps1 stamps2;
wenzelm@2185
   997
      val tsig = Type.merge_tsigs (tsig1, tsig2);
wenzelm@251
   998
      val const_tab = Symtab.merge (op =) (const_tab1, const_tab2)
wenzelm@386
   999
        handle Symtab.DUPS cs =>
wenzelm@3791
  1000
          raise TERM ("Incompatible types for constant(s) " ^ commas_quote cs, []);
wenzelm@386
  1001
      val syn = Syntax.merge_syntaxes syn1 syn2;
wenzelm@3791
  1002
wenzelm@3967
  1003
      val path = [];
wenzelm@3791
  1004
      val kinds = distinct (map fst (spaces1 @ spaces2));
wenzelm@3791
  1005
      val spaces =
wenzelm@3791
  1006
        kinds ~~
wenzelm@3791
  1007
          ListPair.map NameSpace.merge
wenzelm@3791
  1008
            (map (space_of spaces1) kinds, map (space_of spaces2) kinds);
wenzelm@3867
  1009
wenzelm@4256
  1010
      val data = merge_data (data1, data2);
wenzelm@3967
  1011
wenzelm@3967
  1012
      val sign = make_sign (id, self, tsig, const_tab, syn, path, spaces, data, stamps);
wenzelm@251
  1013
    in
wenzelm@3967
  1014
      self_ref := sign; sign
wenzelm@251
  1015
    end;
wenzelm@143
  1016
wenzelm@4627
  1017
fun nontriv_merge sg1_sg2 =
wenzelm@3967
  1018
  (case handle_error merge_aux sg1_sg2 of
wenzelm@3805
  1019
    OK sg => sg
wenzelm@3805
  1020
  | Error msg => raise TERM (msg, []));
wenzelm@3805
  1021
clasohm@0
  1022
clasohm@0
  1023
wenzelm@3995
  1024
(** partial Pure signature **)
clasohm@0
  1025
wenzelm@3967
  1026
val dummy_sg = make_sign (ref "", SgRef None, Type.tsig0,
wenzelm@4489
  1027
  Symtab.empty, Syntax.pure_syn, [], [], empty_data, []);
wenzelm@3967
  1028
wenzelm@3995
  1029
val pre_pure =
wenzelm@3967
  1030
  create_sign (SgRef (Some (ref dummy_sg))) [] "#"
wenzelm@4489
  1031
    (Syntax.pure_syn, Type.tsig0, Symtab.empty, ([], []), empty_data);
clasohm@0
  1032
wenzelm@3791
  1033
clasohm@0
  1034
end;
wenzelm@3791
  1035
wenzelm@3791
  1036
wenzelm@3791
  1037
val long_names = Sign.long_names;