removed redundant less_trans, less_linear, le_imp_less_or_eq, le_less_trans, less_le_trans (cf. Orderings.thy);
renamed less_imp_le to less_imp_le_nat;
(* Title: Pure/facts.ML
ID: $Id$
Author: Makarius
Environment of named facts, optionally indexed by proposition.
*)
signature FACTS =
sig
type T
val space_of: T -> NameSpace.T
val lookup: T -> string -> thm list option
val dest: T -> (string * thm list) list
val extern: T -> (xstring * thm list) list
val props: T -> thm list
val could_unify: T -> term -> thm list
val empty: T
val merge: T * T -> T
val add_global: NameSpace.naming -> string * thm list -> T -> T
val add_local: bool -> NameSpace.naming -> string * thm list -> T -> T
val del: string -> T -> T
end;
structure Facts: FACTS =
struct
(* datatype *)
datatype T = Facts of
{facts: thm list NameSpace.table,
props: thm Net.net};
fun make_facts facts props = Facts {facts = facts, props = props};
(* named facts *)
fun facts_of (Facts {facts, ...}) = facts;
val space_of = #1 o facts_of;
val lookup = Symtab.lookup o #2 o facts_of;
val dest = NameSpace.dest_table o facts_of;
val extern = NameSpace.extern_table o facts_of;
(* indexed props *)
val prop_ord = Term.term_ord o pairself Thm.full_prop_of;
fun props (Facts {props, ...}) = sort_distinct prop_ord (Net.content props);
fun could_unify (Facts {props, ...}) = Net.unify_term props;
(* build facts *)
val empty = make_facts NameSpace.empty_table Net.empty;
fun merge (Facts {facts = facts1, props = props1}, Facts {facts = facts2, props = props2}) =
let
val facts' = NameSpace.merge_tables (K true) (facts1, facts2);
val props' = Net.merge (is_equal o prop_ord) (props1, props2);
in make_facts facts' props' end;
fun add permissive do_props naming (name, ths) (Facts {facts, props}) =
let
val facts' =
if name = "" then facts
else
let
val (space, tab) = facts;
val space' = NameSpace.declare naming name space;
val tab' = (if permissive then Symtab.update else Symtab.update_new) (name, ths) tab
handle Symtab.DUP dup => (legacy_feature ("Duplicate fact " ^ quote dup ^
Position.str_of (Position.thread_data ())); tab);
in (space', tab') end;
val props' =
if do_props then fold (fn th => Net.insert_term (K false) (Thm.full_prop_of th, th)) ths props
else props;
in make_facts facts' props' end;
val add_global = add false false;
val add_local = add true;
fun del name (Facts {facts = (space, tab), props}) =
let
val space' = NameSpace.hide true name space handle ERROR _ => space;
val tab' = Symtab.delete_safe name tab;
in make_facts (space', tab') props end;
end;