src/Pure/variable.ML
author wenzelm
Sun, 25 Nov 2012 19:49:24 +0100
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Isabelle-specific implementation of quasi-abstract markup elements -- back to module arrangement before d83797ef0d2d;
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(*  Title:      Pure/variable.ML
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    Author:     Makarius
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Fixed type/term variables and polymorphic term abbreviations.
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*)
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signature VARIABLE =
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sig
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  val is_body: Proof.context -> bool
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  val set_body: bool -> Proof.context -> Proof.context
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  val restore_body: Proof.context -> Proof.context -> Proof.context
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  val names_of: Proof.context -> Name.context
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  val binds_of: Proof.context -> (typ * term) Vartab.table
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  val maxidx_of: Proof.context -> int
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  val sorts_of: Proof.context -> sort list
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  val constraints_of: Proof.context -> typ Vartab.table * sort Vartab.table
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  val is_declared: Proof.context -> string -> bool
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  val check_name: binding -> string
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  val default_type: Proof.context -> string -> typ option
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  val def_type: Proof.context -> bool -> indexname -> typ option
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  val def_sort: Proof.context -> indexname -> sort option
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  val declare_names: term -> Proof.context -> Proof.context
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  val declare_constraints: term -> Proof.context -> Proof.context
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  val declare_term: term -> Proof.context -> Proof.context
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  val declare_typ: typ -> Proof.context -> Proof.context
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  val declare_prf: Proofterm.proof -> Proof.context -> Proof.context
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  val declare_thm: thm -> Proof.context -> Proof.context
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  val global_thm_context: thm -> Proof.context
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  val variant_frees: Proof.context -> term list -> (string * 'a) list -> (string * 'a) list
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  val bind_term: indexname * term option -> Proof.context -> Proof.context
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  val expand_binds: Proof.context -> term -> term
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  val lookup_const: Proof.context -> string -> string option
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  val is_const: Proof.context -> string -> bool
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  val declare_const: string * string -> Proof.context -> Proof.context
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  val is_fixed: Proof.context -> string -> bool
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  val newly_fixed: Proof.context -> Proof.context -> string -> bool
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  val fixed_ord: Proof.context -> string * string -> order
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  val intern_fixed: Proof.context -> string -> string
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  val markup_fixed: Proof.context -> string -> Markup.T
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  val lookup_fixed: Proof.context -> string -> string option
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  val revert_fixed: Proof.context -> string -> string
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  val add_fixed_names: Proof.context -> term -> string list -> string list
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  val add_fixed: Proof.context -> term -> (string * typ) list -> (string * typ) list
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  val add_free_names: Proof.context -> term -> string list -> string list
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  val add_frees: Proof.context -> term -> (string * typ) list -> (string * typ) list
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  val add_fixes_binding: binding list -> Proof.context -> string list * Proof.context
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  val add_fixes: string list -> Proof.context -> string list * Proof.context
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  val add_fixes_direct: string list -> Proof.context -> Proof.context
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  val auto_fixes: term -> Proof.context -> Proof.context
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  val variant_fixes: string list -> Proof.context -> string list * Proof.context
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  val dest_fixes: Proof.context -> (string * string) list
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  val invent_types: sort list -> Proof.context -> (string * sort) list * Proof.context
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  val export_terms: Proof.context -> Proof.context -> term list -> term list
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  val exportT_terms: Proof.context -> Proof.context -> term list -> term list
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  val exportT: Proof.context -> Proof.context -> thm list -> thm list
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  val export_prf: Proof.context -> Proof.context -> Proofterm.proof -> Proofterm.proof
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  val export: Proof.context -> Proof.context -> thm list -> thm list
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  val export_morphism: Proof.context -> Proof.context -> morphism
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  val importT_inst: term list -> Proof.context -> ((indexname * sort) * typ) list * Proof.context
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  val import_inst: bool -> term list -> Proof.context ->
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    (((indexname * sort) * typ) list * ((indexname * typ) * term) list) * Proof.context
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  val importT_terms: term list -> Proof.context -> term list * Proof.context
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  val import_terms: bool -> term list -> Proof.context -> term list * Proof.context
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  val importT: thm list -> Proof.context -> ((ctyp * ctyp) list * thm list) * Proof.context
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  val import_prf: bool -> Proofterm.proof -> Proof.context -> Proofterm.proof * Proof.context
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  val import: bool -> thm list -> Proof.context ->
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    (((ctyp * ctyp) list * (cterm * cterm) list) * thm list) * Proof.context
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  val tradeT: (Proof.context -> thm list -> thm list) -> Proof.context -> thm list -> thm list
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  val trade: (Proof.context -> thm list -> thm list) -> Proof.context -> thm list -> thm list
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  val focus: term -> Proof.context -> ((string * (string * typ)) list * term) * Proof.context
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  val focus_cterm: cterm -> Proof.context -> ((string * cterm) list * cterm) * Proof.context
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  val focus_subgoal: int -> thm -> Proof.context -> ((string * cterm) list * cterm) * Proof.context
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  val warn_extra_tfrees: Proof.context -> Proof.context -> unit
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  val polymorphic_types: Proof.context -> term list -> (indexname * sort) list * term list
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  val polymorphic: Proof.context -> term list -> term list
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end;
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structure Variable: VARIABLE =
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struct
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(** local context data **)
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type fixes = string Name_Space.table;
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val empty_fixes: fixes = Name_Space.empty_table Markup.fixedN;
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datatype data = Data of
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 {is_body: bool,                        (*inner body mode*)
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  names: Name.context,                  (*type/term variable names*)
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  consts: string Symtab.table,          (*consts within the local scope*)
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  fixes: fixes,                         (*term fixes -- global name space, intern ~> extern*)
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  binds: (typ * term) Vartab.table,     (*term bindings*)
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  type_occs: string list Symtab.table,  (*type variables -- possibly within term variables*)
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  maxidx: int,                          (*maximum var index*)
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  sorts: sort Ord_List.T,               (*declared sort occurrences*)
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  constraints:
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    typ Vartab.table *                  (*type constraints*)
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    sort Vartab.table};                 (*default sorts*)
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fun make_data (is_body, names, consts, fixes, binds, type_occs, maxidx, sorts, constraints) =
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  Data {is_body = is_body, names = names, consts = consts, fixes = fixes, binds = binds,
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    type_occs = type_occs, maxidx = maxidx, sorts = sorts, constraints = constraints};
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structure Data = Proof_Data
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(
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  type T = data;
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  fun init _ =
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    make_data (false, Name.context, Symtab.empty, empty_fixes, Vartab.empty,
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      Symtab.empty, ~1, [], (Vartab.empty, Vartab.empty));
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);
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fun map_data f =
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  Data.map (fn Data {is_body, names, consts, fixes, binds, type_occs, maxidx, sorts, constraints} =>
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    make_data (f (is_body, names, consts, fixes, binds, type_occs, maxidx, sorts, constraints)));
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fun map_names f =
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  map_data (fn (is_body, names, consts, fixes, binds, type_occs, maxidx, sorts, constraints) =>
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    (is_body, f names, consts, fixes, binds, type_occs, maxidx, sorts, constraints));
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fun map_consts f =
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  map_data (fn (is_body, names, consts, fixes, binds, type_occs, maxidx, sorts, constraints) =>
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    (is_body, names, f consts, fixes, binds, type_occs, maxidx, sorts, constraints));
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fun map_fixes f =
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  map_data (fn (is_body, names, consts, fixes, binds, type_occs, maxidx, sorts, constraints) =>
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    (is_body, names, consts, f fixes, binds, type_occs, maxidx, sorts, constraints));
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fun map_binds f =
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  map_data (fn (is_body, names, consts, fixes, binds, type_occs, maxidx, sorts, constraints) =>
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    (is_body, names, consts, fixes, f binds, type_occs, maxidx, sorts, constraints));
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fun map_type_occs f =
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  map_data (fn (is_body, names, consts, fixes, binds, type_occs, maxidx, sorts, constraints) =>
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    (is_body, names, consts, fixes, binds, f type_occs, maxidx, sorts, constraints));
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fun map_maxidx f =
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  map_data (fn (is_body, names, consts, fixes, binds, type_occs, maxidx, sorts, constraints) =>
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    (is_body, names, consts, fixes, binds, type_occs, f maxidx, sorts, constraints));
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fun map_sorts f =
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  map_data (fn (is_body, names, consts, fixes, binds, type_occs, maxidx, sorts, constraints) =>
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    (is_body, names, consts, fixes, binds, type_occs, maxidx, f sorts, constraints));
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fun map_constraints f =
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  map_data (fn (is_body, names, consts, fixes, binds, type_occs, maxidx, sorts, constraints) =>
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    (is_body, names, consts, fixes, binds, type_occs, maxidx, sorts, f constraints));
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fun rep_data ctxt = Data.get ctxt |> (fn Data rep => rep);
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val is_body = #is_body o rep_data;
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fun set_body b =
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  map_data (fn (_, names, consts, fixes, binds, type_occs, maxidx, sorts, constraints) =>
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    (b, names, consts, fixes, binds, type_occs, maxidx, sorts, constraints));
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fun restore_body ctxt = set_body (is_body ctxt);
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val names_of = #names o rep_data;
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val fixes_of = #fixes o rep_data;
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val fixes_space = #1 o fixes_of;
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val binds_of = #binds o rep_data;
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val type_occs_of = #type_occs o rep_data;
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val maxidx_of = #maxidx o rep_data;
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val sorts_of = #sorts o rep_data;
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val constraints_of = #constraints o rep_data;
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val is_declared = Name.is_declared o names_of;
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val check_name = Name_Space.base_name o tap Binding.check;
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(** declarations **)
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(* default sorts and types *)
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fun default_type ctxt x = Vartab.lookup (#1 (constraints_of ctxt)) (x, ~1);
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fun def_type ctxt pattern xi =
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  let val {binds, constraints = (types, _), ...} = rep_data ctxt in
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    (case Vartab.lookup types xi of
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      NONE =>
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        if pattern then NONE
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        else Vartab.lookup binds xi |> Option.map (Type.mark_polymorphic o #1)
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    | some => some)
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  end;
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val def_sort = Vartab.lookup o #2 o constraints_of;
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(* names *)
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fun declare_type_names t =
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  map_names (fold_types (fold_atyps Term.declare_typ_names) t) #>
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  map_maxidx (fold_types Term.maxidx_typ t);
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fun declare_names t =
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  declare_type_names t #>
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  map_names (fold_aterms Term.declare_term_frees t) #>
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  map_maxidx (Term.maxidx_term t);
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(* type occurrences *)
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fun decl_type_occsT T = fold_atyps (fn TFree (a, _) => Symtab.default (a, []) | _ => I) T;
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val decl_type_occs = fold_term_types
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  (fn Free (x, _) => fold_atyps (fn TFree (a, _) => Symtab.insert_list (op =) (a, x) | _ => I)
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    | _ => decl_type_occsT);
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val declare_type_occsT = map_type_occs o fold_types decl_type_occsT;
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val declare_type_occs = map_type_occs o decl_type_occs;
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(* constraints *)
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fun constrain_tvar (xi, raw_S) =
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  let val S = #2 (Term_Position.decode_positionS raw_S)
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  in if S = dummyS then Vartab.delete_safe xi else Vartab.update (xi, S) end;
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fun declare_constraints t = map_constraints (fn (types, sorts) =>
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  let
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    val types' = fold_aterms
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      (fn Free (x, T) => Vartab.update ((x, ~1), T)
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        | Var v => Vartab.update v
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        | _ => I) t types;
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    val sorts' = (fold_types o fold_atyps)
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      (fn TFree (x, S) => constrain_tvar ((x, ~1), S)
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        | TVar v => constrain_tvar v
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        | _ => I) t sorts;
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  in (types', sorts') end)
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  #> declare_type_occsT t
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  #> declare_type_names t;
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(* common declarations *)
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fun declare_internal t =
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  declare_names t #>
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  declare_type_occs t #>
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  map_sorts (Sorts.insert_term t);
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fun declare_term t =
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  declare_internal t #>
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  declare_constraints t;
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val declare_typ = declare_term o Logic.mk_type;
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val declare_prf = Proofterm.fold_proof_terms declare_internal (declare_internal o Logic.mk_type);
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val declare_thm = Thm.fold_terms declare_internal;
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fun global_thm_context th = declare_thm th (Proof_Context.init_global (Thm.theory_of_thm th));
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(* renaming term/type frees *)
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fun variant_frees ctxt ts frees =
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  let
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    val names = names_of (fold declare_names ts ctxt);
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    val xs = fst (fold_map Name.variant (map #1 frees) names);
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  in xs ~~ map snd frees end;
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(** term bindings **)
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fun bind_term (xi, NONE) = map_binds (Vartab.delete_safe xi)
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  | bind_term ((x, i), SOME t) =
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      let
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        val u = Term.close_schematic_term t;
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        val U = Term.fastype_of u;
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      in declare_term u #> map_binds (Vartab.update ((x, i), (U, u))) end;
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fun expand_binds ctxt =
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  let
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    val binds = binds_of ctxt;
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    val get = fn Var (xi, _) => Vartab.lookup binds xi | _ => NONE;
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  in Envir.beta_norm o Envir.expand_term get end;
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(** consts **)
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val lookup_const = Symtab.lookup o #consts o rep_data;
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val is_const = is_some oo lookup_const;
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val declare_fixed = map_consts o Symtab.delete_safe;
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val declare_const = map_consts o Symtab.update;
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(** fixes **)
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(* specialized name space *)
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val is_fixed = Name_Space.defined_entry o fixes_space;
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fun newly_fixed inner outer = is_fixed inner andf (not o is_fixed outer);
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val fixed_ord = Name_Space.entry_ord o fixes_space;
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val intern_fixed = Name_Space.intern o fixes_space;
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fun lookup_fixed ctxt x =
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  let val x' = intern_fixed ctxt x
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  in if is_fixed ctxt x' then SOME x' else NONE end;
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fun revert_fixed ctxt x =
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  (case Symtab.lookup (#2 (fixes_of ctxt)) x of
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    SOME x' => if intern_fixed ctxt x' = x then x' else x
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  | NONE => x);
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fun markup_fixed ctxt x =
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  Name_Space.markup (fixes_space ctxt) x
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  |> Markup.name (revert_fixed ctxt x);
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fun dest_fixes ctxt =
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  let val (space, tab) = fixes_of ctxt
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  in sort (Name_Space.entry_ord space o pairself #2) (map swap (Symtab.dest tab)) end;
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(* collect variables *)
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fun add_free_names ctxt =
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  fold_aterms (fn Free (x, _) => not (is_fixed ctxt x) ? insert (op =) x | _ => I);
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fun add_frees ctxt =
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  fold_aterms (fn Free (x, T) => not (is_fixed ctxt x) ? insert (op =) (x, T) | _ => I);
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fun add_fixed_names ctxt =
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  fold_aterms (fn Free (x, _) => is_fixed ctxt x ? insert (op =) x | _ => I);
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fun add_fixed ctxt =
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  fold_aterms (fn Free (x, T) => is_fixed ctxt x ? insert (op =) (x, T) | _ => I);
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(* declarations *)
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local
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fun err_dups dups =
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  error ("Duplicate fixed variable(s): " ^ commas (map Binding.print dups));
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fun new_fixed ((x, x'), pos) ctxt =
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  if is_some (lookup_fixed ctxt x') then err_dups [Binding.make (x, pos)]
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  else
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    let val context = Context.Proof ctxt |> Name_Space.map_naming (K Name_Space.default_naming) in
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      ctxt
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      |> map_fixes
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        (Name_Space.define context true (Binding.make (x', pos), x) #> snd #>>
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          Name_Space.alias Name_Space.default_naming (Binding.make (x, pos)) x')
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      |> declare_fixed x
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      |> declare_constraints (Syntax.free x')
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  end;
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fun new_fixes names' xs xs' ps =
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  map_names (K names') #>
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  fold new_fixed ((xs ~~ xs') ~~ ps) #>
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  pair xs';
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in
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fun add_fixes_binding bs ctxt =
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  let
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    val _ =
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      (case filter (can Name.dest_skolem o Binding.name_of) bs of
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        [] => ()
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      | bads => error ("Illegal internal Skolem constant(s): " ^ commas (map Binding.print bads)));
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    val _ =
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      (case duplicates (op = o pairself Binding.name_of) bs of
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        [] => ()
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      | dups => err_dups dups);
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    val xs = map check_name bs;
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    val names = names_of ctxt;
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    val (xs', names') =
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      if is_body ctxt then fold_map Name.variant xs names |>> map Name.skolem
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      else (xs, fold Name.declare xs names);
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  in ctxt |> new_fixes names' xs xs' (map Binding.pos_of bs) end;
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fun variant_fixes raw_xs ctxt =
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  let
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    val names = names_of ctxt;
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    val xs = map (fn x => Name.clean x |> can Name.dest_internal x ? Name.internal) raw_xs;
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    val (xs', names') = fold_map Name.variant xs names |>> (is_body ctxt ? map Name.skolem);
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  in ctxt |> new_fixes names' xs xs' (replicate (length xs) Position.none) end;
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   385
end;
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   386
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val add_fixes = add_fixes_binding o map Binding.name;
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   388
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   389
fun add_fixes_direct xs ctxt = ctxt
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   390
  |> set_body false
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   391
  |> (snd o add_fixes xs)
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   392
  |> restore_body ctxt;
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   393
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   394
fun auto_fixes t ctxt = ctxt
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   395
  |> not (is_body ctxt) ? add_fixes_direct (rev (add_free_names ctxt t []))
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   396
  |> declare_term t;
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   397
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   398
fun invent_types Ss ctxt =
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   399
  let
43329
84472e198515 tuned signature: Name.invent and Name.invent_names;
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   400
    val tfrees = Name.invent (names_of ctxt) Name.aT (length Ss) ~~ Ss;
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   401
    val ctxt' = fold (declare_constraints o Logic.mk_type o TFree) tfrees ctxt;
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   402
  in (tfrees, ctxt') end;
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
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   403
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
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diff changeset
   404
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
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   405
22671
3c62305fbee6 tuned signature;
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   406
(** export -- generalize type/term variables (beware of closure sizes) **)
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   407
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   408
fun export_inst inner outer =
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
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   409
  let
20162
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   410
    val declared_outer = is_declared outer;
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   411
    val still_fixed = not o newly_fixed inner outer;
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   412
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   413
    val gen_fixes =
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   414
      Symtab.fold (fn (y, _) => not (is_fixed outer y) ? cons y)
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   415
        (#2 (fixes_of inner)) [];
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   416
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diff changeset
   417
    val type_occs_inner = type_occs_of inner;
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   418
    fun gen_fixesT ts =
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300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
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   419
      Symtab.fold (fn (a, xs) =>
20162
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diff changeset
   420
        if declared_outer a orelse exists still_fixed xs
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   421
        then I else cons a) (fold decl_type_occs ts type_occs_inner) [];
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diff changeset
   422
  in (gen_fixesT, gen_fixes) end;
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
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diff changeset
   423
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
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diff changeset
   424
fun exportT_inst inner outer = #1 (export_inst inner outer);
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
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   425
22671
3c62305fbee6 tuned signature;
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   426
fun exportT_terms inner outer =
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   427
  let val mk_tfrees = exportT_inst inner outer in
3c62305fbee6 tuned signature;
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diff changeset
   428
    fn ts => ts |> map
31977
e03059ae2d82 renamed structure TermSubst to Term_Subst;
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diff changeset
   429
      (Term_Subst.generalize (mk_tfrees ts, [])
22671
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diff changeset
   430
        (fold (Term.fold_types Term.maxidx_typ) ts ~1 + 1))
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diff changeset
   431
  end;
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
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diff changeset
   432
22671
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   433
fun export_terms inner outer =
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diff changeset
   434
  let val (mk_tfrees, tfrees) = export_inst inner outer in
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diff changeset
   435
    fn ts => ts |> map
31977
e03059ae2d82 renamed structure TermSubst to Term_Subst;
wenzelm
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diff changeset
   436
      (Term_Subst.generalize (mk_tfrees ts, tfrees)
22671
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diff changeset
   437
        (fold Term.maxidx_term ts ~1 + 1))
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diff changeset
   438
  end;
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
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parents: 19899
diff changeset
   439
20303
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   440
fun export_prf inner outer prf =
e25d5a2a50bc normalized Proof.context/method type aliases;
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diff changeset
   441
  let
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diff changeset
   442
    val (mk_tfrees, frees) = export_inst (declare_prf prf inner) outer;
3c62305fbee6 tuned signature;
wenzelm
parents: 22601
diff changeset
   443
    val tfrees = mk_tfrees [];
20303
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   444
    val idx = Proofterm.maxidx_proof prf ~1 + 1;
36620
e6bb250402b5 simplified/unified fundamental operations on types/terms/proofterms -- prefer Same.operation over "option" variant;
wenzelm
parents: 36610
diff changeset
   445
    val gen_term = Term_Subst.generalize_same (tfrees, frees) idx;
e6bb250402b5 simplified/unified fundamental operations on types/terms/proofterms -- prefer Same.operation over "option" variant;
wenzelm
parents: 36610
diff changeset
   446
    val gen_typ = Term_Subst.generalizeT_same tfrees idx;
e6bb250402b5 simplified/unified fundamental operations on types/terms/proofterms -- prefer Same.operation over "option" variant;
wenzelm
parents: 36610
diff changeset
   447
  in Same.commit (Proofterm.map_proof_terms_same gen_term gen_typ) prf end;
20303
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   448
22671
3c62305fbee6 tuned signature;
wenzelm
parents: 22601
diff changeset
   449
3c62305fbee6 tuned signature;
wenzelm
parents: 22601
diff changeset
   450
fun gen_export (mk_tfrees, frees) ths =
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   451
  let
22671
3c62305fbee6 tuned signature;
wenzelm
parents: 22601
diff changeset
   452
    val tfrees = mk_tfrees (map Thm.full_prop_of ths);
3c62305fbee6 tuned signature;
wenzelm
parents: 22601
diff changeset
   453
    val maxidx = fold Thm.maxidx_thm ths ~1;
3c62305fbee6 tuned signature;
wenzelm
parents: 22601
diff changeset
   454
  in map (Thm.generalize (tfrees, frees) (maxidx + 1)) ths end;
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   455
22671
3c62305fbee6 tuned signature;
wenzelm
parents: 22601
diff changeset
   456
fun exportT inner outer = gen_export (exportT_inst inner outer, []);
3c62305fbee6 tuned signature;
wenzelm
parents: 22601
diff changeset
   457
fun export inner outer = gen_export (export_inst inner outer);
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   458
21522
bd641d927437 added export_morphism;
wenzelm
parents: 21369
diff changeset
   459
fun export_morphism inner outer =
bd641d927437 added export_morphism;
wenzelm
parents: 21369
diff changeset
   460
  let
bd641d927437 added export_morphism;
wenzelm
parents: 21369
diff changeset
   461
    val fact = export inner outer;
bd641d927437 added export_morphism;
wenzelm
parents: 21369
diff changeset
   462
    val term = singleton (export_terms inner outer);
bd641d927437 added export_morphism;
wenzelm
parents: 21369
diff changeset
   463
    val typ = Logic.type_map term;
45289
25e9e7f527b4 slightly more explicit/syntactic modelling of morphisms;
wenzelm
parents: 43790
diff changeset
   464
  in Morphism.morphism {binding = [], typ = [typ], term = [term], fact = [fact]} end;
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   465
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   466
24765
3128ccd9121f maintain maxidx (analogous to name context);
wenzelm
parents: 24719
diff changeset
   467
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   468
(** import -- fix schematic type/term variables **)
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   469
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   470
fun importT_inst ts ctxt =
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   471
  let
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   472
    val tvars = rev (fold Term.add_tvars ts []);
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   473
    val (tfrees, ctxt') = invent_types (map #2 tvars) ctxt;
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   474
  in (tvars ~~ map TFree tfrees, ctxt') end;
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   475
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   476
fun import_inst is_open ts ctxt =
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   477
  let
26714
4773b832f1b1 variant_fixes: preserve internal state, mark skolem only for body mode;
wenzelm
parents: 25573
diff changeset
   478
    val ren = Name.clean #> (if is_open then I else Name.internal);
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   479
    val (instT, ctxt') = importT_inst ts ctxt;
31977
e03059ae2d82 renamed structure TermSubst to Term_Subst;
wenzelm
parents: 31794
diff changeset
   480
    val vars = map (apsnd (Term_Subst.instantiateT instT)) (rev (fold Term.add_vars ts []));
20797
c1f0bc7e7d80 renamed Variable.invent_fixes to Variable.variant_fixes;
wenzelm
parents: 20579
diff changeset
   481
    val (xs, ctxt'') = variant_fixes (map (ren o #1 o #1) vars) ctxt';
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   482
    val inst = vars ~~ map Free (xs ~~ map #2 vars);
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   483
  in ((instT, inst), ctxt'') end;
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   484
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   485
fun importT_terms ts ctxt =
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   486
  let val (instT, ctxt') = importT_inst ts ctxt
31977
e03059ae2d82 renamed structure TermSubst to Term_Subst;
wenzelm
parents: 31794
diff changeset
   487
  in (map (Term_Subst.instantiate (instT, [])) ts, ctxt') end;
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   488
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   489
fun import_terms is_open ts ctxt =
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   490
  let val (inst, ctxt') = import_inst is_open ts ctxt
31977
e03059ae2d82 renamed structure TermSubst to Term_Subst;
wenzelm
parents: 31794
diff changeset
   491
  in (map (Term_Subst.instantiate inst) ts, ctxt') end;
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   492
31794
71af1fd6a5e4 renamed Variable.import_thms to Variable.import (back again cf. ed7aa5a350ef -- Alice is no longer supported);
wenzelm
parents: 30756
diff changeset
   493
fun importT ths ctxt =
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   494
  let
42360
da8817d01e7c modernized structure Proof_Context;
wenzelm
parents: 42357
diff changeset
   495
    val thy = Proof_Context.theory_of ctxt;
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   496
    val (instT, ctxt') = importT_inst (map Thm.full_prop_of ths) ctxt;
32280
4fb3f426052a Variable.importT/import: return full instantiations, tuned;
wenzelm
parents: 32199
diff changeset
   497
    val insts' as (instT', _) = Thm.certify_inst thy (instT, []);
4fb3f426052a Variable.importT/import: return full instantiations, tuned;
wenzelm
parents: 32199
diff changeset
   498
    val ths' = map (Thm.instantiate insts') ths;
4fb3f426052a Variable.importT/import: return full instantiations, tuned;
wenzelm
parents: 32199
diff changeset
   499
  in ((instT', ths'), ctxt') end;
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   500
20303
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   501
fun import_prf is_open prf ctxt =
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   502
  let
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   503
    val ts = rev (Proofterm.fold_proof_terms cons (cons o Logic.mk_type) prf []);
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   504
    val (insts, ctxt') = import_inst is_open ts ctxt;
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   505
  in (Proofterm.instantiate insts prf, ctxt') end;
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   506
31794
71af1fd6a5e4 renamed Variable.import_thms to Variable.import (back again cf. ed7aa5a350ef -- Alice is no longer supported);
wenzelm
parents: 30756
diff changeset
   507
fun import is_open ths ctxt =
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   508
  let
42360
da8817d01e7c modernized structure Proof_Context;
wenzelm
parents: 42357
diff changeset
   509
    val thy = Proof_Context.theory_of ctxt;
32280
4fb3f426052a Variable.importT/import: return full instantiations, tuned;
wenzelm
parents: 32199
diff changeset
   510
    val (insts, ctxt') = import_inst is_open (map Thm.full_prop_of ths) ctxt;
4fb3f426052a Variable.importT/import: return full instantiations, tuned;
wenzelm
parents: 32199
diff changeset
   511
    val insts' = Thm.certify_inst thy insts;
4fb3f426052a Variable.importT/import: return full instantiations, tuned;
wenzelm
parents: 32199
diff changeset
   512
    val ths' = map (Thm.instantiate insts') ths;
4fb3f426052a Variable.importT/import: return full instantiations, tuned;
wenzelm
parents: 32199
diff changeset
   513
  in ((insts', ths'), ctxt') end;
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   514
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   515
19926
feb4d150cfd8 added declare_thm, thm_context;
wenzelm
parents: 19911
diff changeset
   516
(* import/export *)
feb4d150cfd8 added declare_thm, thm_context;
wenzelm
parents: 19911
diff changeset
   517
21287
a713ae348e8a tuned Variable.trade;
wenzelm
parents: 20797
diff changeset
   518
fun gen_trade imp exp f ctxt ths =
20220
5dc68e9ecd9a import(T): result includes fixed types/terms;
wenzelm
parents: 20198
diff changeset
   519
  let val ((_, ths'), ctxt') = imp ths ctxt
21287
a713ae348e8a tuned Variable.trade;
wenzelm
parents: 20797
diff changeset
   520
  in exp ctxt' ctxt (f ctxt' ths') end;
19926
feb4d150cfd8 added declare_thm, thm_context;
wenzelm
parents: 19911
diff changeset
   521
31794
71af1fd6a5e4 renamed Variable.import_thms to Variable.import (back again cf. ed7aa5a350ef -- Alice is no longer supported);
wenzelm
parents: 30756
diff changeset
   522
val tradeT = gen_trade importT exportT;
71af1fd6a5e4 renamed Variable.import_thms to Variable.import (back again cf. ed7aa5a350ef -- Alice is no longer supported);
wenzelm
parents: 30756
diff changeset
   523
val trade = gen_trade (import true) export;
19926
feb4d150cfd8 added declare_thm, thm_context;
wenzelm
parents: 19911
diff changeset
   524
feb4d150cfd8 added declare_thm, thm_context;
wenzelm
parents: 19911
diff changeset
   525
42495
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   526
(* focus on outermost parameters: !!x y z. B *)
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   527
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   528
fun focus_params t ctxt =
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   529
  let
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   530
    val (xs, Ts) =
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   531
      split_list (Term.variant_frees t (Term.strip_all_vars t));  (*as they are printed :-*)
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   532
    val (xs', ctxt') = variant_fixes xs ctxt;
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   533
    val ps = xs' ~~ Ts;
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   534
    val ctxt'' = ctxt' |> fold (declare_constraints o Free) ps;
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   535
  in ((xs, ps), ctxt'') end;
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   536
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   537
fun focus t ctxt =
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   538
  let
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   539
    val ((xs, ps), ctxt') = focus_params t ctxt;
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   540
    val t' = Term.subst_bounds (rev (map Free ps), Term.strip_all_body t);
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   541
  in (((xs ~~ ps), t'), ctxt') end;
20149
54d4ea7927be added newly_fixed, focus;
wenzelm
parents: 20123
diff changeset
   542
54d4ea7927be added newly_fixed, focus;
wenzelm
parents: 20123
diff changeset
   543
fun forall_elim_prop t prop =
46497
89ccf66aa73d renamed Thm.capply to Thm.apply, and Thm.cabs to Thm.lambda in conformance with similar operations in structure Term and Logic;
wenzelm
parents: 45666
diff changeset
   544
  Thm.beta_conversion false (Thm.apply (Thm.dest_arg prop) t)
20579
4dc799edef89 Thm.dest_arg;
wenzelm
parents: 20509
diff changeset
   545
  |> Thm.cprop_of |> Thm.dest_arg;
20149
54d4ea7927be added newly_fixed, focus;
wenzelm
parents: 20123
diff changeset
   546
42495
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   547
fun focus_cterm goal ctxt =
20149
54d4ea7927be added newly_fixed, focus;
wenzelm
parents: 20123
diff changeset
   548
  let
54d4ea7927be added newly_fixed, focus;
wenzelm
parents: 20123
diff changeset
   549
    val cert = Thm.cterm_of (Thm.theory_of_cterm goal);
42495
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   550
    val ((xs, ps), ctxt') = focus_params (Thm.term_of goal) ctxt;
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   551
    val ps' = map (cert o Free) ps;
20220
5dc68e9ecd9a import(T): result includes fixed types/terms;
wenzelm
parents: 20198
diff changeset
   552
    val goal' = fold forall_elim_prop ps' goal;
42495
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   553
  in ((xs ~~ ps', goal'), ctxt') end;
20149
54d4ea7927be added newly_fixed, focus;
wenzelm
parents: 20123
diff changeset
   554
20303
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   555
fun focus_subgoal i st =
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   556
  let
22691
290454649b8c Thm.fold_terms;
wenzelm
parents: 22671
diff changeset
   557
    val all_vars = Thm.fold_terms Term.add_vars st [];
20303
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   558
    val no_binds = map (fn (xi, _) => (xi, NONE)) all_vars;
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   559
  in
30756
1a9f93c1ed22 replaced add_binds by singleton bind_term;
wenzelm
parents: 29605
diff changeset
   560
    fold bind_term no_binds #>
20303
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   561
    fold (declare_constraints o Var) all_vars #>
42495
1af81b70cf09 clarified Variable.focus vs. Variable.focus_cterm -- eliminated clone;
wenzelm
parents: 42494
diff changeset
   562
    focus_cterm (Thm.cprem_of st i)
20303
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   563
  end;
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   564
e25d5a2a50bc normalized Proof.context/method type aliases;
wenzelm
parents: 20262
diff changeset
   565
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   566
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   567
(** implicit polymorphism **)
19899
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   568
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   569
(* warn_extra_tfrees *)
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   570
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   571
fun warn_extra_tfrees ctxt1 ctxt2 =
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   572
  let
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   573
    fun occs_typ a = Term.exists_subtype (fn TFree (b, _) => a = b | _ => false);
20162
d4bcb27686f9 reorganize declarations (more efficient);
wenzelm
parents: 20149
diff changeset
   574
    fun occs_free a x =
d4bcb27686f9 reorganize declarations (more efficient);
wenzelm
parents: 20149
diff changeset
   575
      (case def_type ctxt1 false (x, ~1) of
d4bcb27686f9 reorganize declarations (more efficient);
wenzelm
parents: 20149
diff changeset
   576
        SOME T => if occs_typ a T then I else cons (a, x)
d4bcb27686f9 reorganize declarations (more efficient);
wenzelm
parents: 20149
diff changeset
   577
      | NONE => cons (a, x));
19899
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   578
20162
d4bcb27686f9 reorganize declarations (more efficient);
wenzelm
parents: 20149
diff changeset
   579
    val occs1 = type_occs_of ctxt1;
d4bcb27686f9 reorganize declarations (more efficient);
wenzelm
parents: 20149
diff changeset
   580
    val occs2 = type_occs_of ctxt2;
19911
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   581
    val extras = Symtab.fold (fn (a, xs) =>
300bc6ce970d major reworking of export functionality -- based on Term/Thm.generalize;
wenzelm
parents: 19899
diff changeset
   582
      if Symtab.defined occs1 a then I else fold (occs_free a) xs) occs2 [];
19899
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   583
    val tfrees = map #1 extras |> sort_distinct string_ord;
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   584
    val frees = map #2 extras |> sort_distinct string_ord;
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   585
  in
38831
4933a3dfd745 more careful treatment of context visibility flag wrt. spurious warnings;
wenzelm
parents: 37145
diff changeset
   586
    if null extras orelse not (Context_Position.is_visible ctxt2) then ()
19899
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   587
    else warning ("Introduced fixed type variable(s): " ^ commas tfrees ^ " in " ^
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   588
      space_implode " or " (map quote frees))
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   589
  end;
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   590
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   591
20149
54d4ea7927be added newly_fixed, focus;
wenzelm
parents: 20123
diff changeset
   592
(* polymorphic terms *)
19899
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   593
24694
54f06f7feefa added polymorphic_types;
wenzelm
parents: 22846
diff changeset
   594
fun polymorphic_types ctxt ts =
20003
aac2c0d29751 polymorphic: always generalize wrt. used_types;
wenzelm
parents: 19926
diff changeset
   595
  let
aac2c0d29751 polymorphic: always generalize wrt. used_types;
wenzelm
parents: 19926
diff changeset
   596
    val ctxt' = fold declare_term ts ctxt;
20162
d4bcb27686f9 reorganize declarations (more efficient);
wenzelm
parents: 20149
diff changeset
   597
    val occs = type_occs_of ctxt;
d4bcb27686f9 reorganize declarations (more efficient);
wenzelm
parents: 20149
diff changeset
   598
    val occs' = type_occs_of ctxt';
d4bcb27686f9 reorganize declarations (more efficient);
wenzelm
parents: 20149
diff changeset
   599
    val types = Symtab.fold (fn (a, _) => if Symtab.defined occs a then I else cons a) occs' [];
24765
3128ccd9121f maintain maxidx (analogous to name context);
wenzelm
parents: 24719
diff changeset
   600
    val idx = maxidx_of ctxt' + 1;
24694
54f06f7feefa added polymorphic_types;
wenzelm
parents: 22846
diff changeset
   601
    val Ts' = (fold o fold_types o fold_atyps)
54f06f7feefa added polymorphic_types;
wenzelm
parents: 22846
diff changeset
   602
      (fn T as TFree _ =>
31977
e03059ae2d82 renamed structure TermSubst to Term_Subst;
wenzelm
parents: 31794
diff changeset
   603
          (case Term_Subst.generalizeT types idx T of TVar v => insert (op =) v | _ => I)
24694
54f06f7feefa added polymorphic_types;
wenzelm
parents: 22846
diff changeset
   604
        | _ => I) ts [];
31977
e03059ae2d82 renamed structure TermSubst to Term_Subst;
wenzelm
parents: 31794
diff changeset
   605
    val ts' = map (Term_Subst.generalize (types, []) idx) ts;
24694
54f06f7feefa added polymorphic_types;
wenzelm
parents: 22846
diff changeset
   606
  in (rev Ts', ts') end;
54f06f7feefa added polymorphic_types;
wenzelm
parents: 22846
diff changeset
   607
54f06f7feefa added polymorphic_types;
wenzelm
parents: 22846
diff changeset
   608
fun polymorphic ctxt ts = snd (polymorphic_types ctxt ts);
20003
aac2c0d29751 polymorphic: always generalize wrt. used_types;
wenzelm
parents: 19926
diff changeset
   609
19899
b7385ca02d79 Fixed type/term variables and polymorphic term abbreviations.
wenzelm
parents:
diff changeset
   610
end;