--- a/src/Pure/consts.ML Mon Feb 06 20:59:01 2006 +0100
+++ b/src/Pure/consts.ML Mon Feb 06 20:59:02 2006 +0100
@@ -2,20 +2,26 @@
ID: $Id$
Author: Makarius
-Polymorphic constants.
+Polymorphic constants: declarations, abbreviations, additional type
+constraints.
*)
signature CONSTS =
sig
type T
- val dest: T -> {declarations: typ NameSpace.table, constraints: typ NameSpace.table}
+ val dest: T ->
+ {constants: (typ * term option) NameSpace.table,
+ constraints: typ NameSpace.table}
val space: T -> NameSpace.T
- val declaration: T -> string -> typ (*exception TYPE*)
- val constraint: T -> string -> typ (*exception TYPE*)
- val monomorphic: T -> string -> bool
+ val declaration: T -> string -> typ (*exception TYPE*)
+ val monomorphic: T -> string -> bool (*exception TYPE*)
+ val constraint: T -> string -> typ (*exception TYPE*)
+ val expansion: Type.tsig -> T -> string * typ -> term option (*exception TYPE*)
+ val certify: Pretty.pp -> Type.tsig -> T -> term -> term (*exception TYPE*)
val typargs: T -> string * typ -> typ list
val instance: T -> string * typ list -> typ
val declare: NameSpace.naming -> bstring * typ -> T -> T
+ val abbreviate: Pretty.pp -> Type.tsig -> NameSpace.naming -> string * term -> T -> T
val constrain: string * typ -> T -> T
val hide: bool -> string -> T -> T
val empty: T
@@ -25,40 +31,71 @@
structure Consts: CONSTS =
struct
-
(** datatype T **)
+datatype decl =
+ LogicalConst of typ * int list list |
+ Abbreviation of typ * term;
+
datatype T = Consts of
- {declarations: ((typ * int list list) * serial) NameSpace.table,
+ {decls: (decl * serial) NameSpace.table,
constraints: typ Symtab.table};
-fun make_consts (declarations, constraints) =
- Consts {declarations = declarations, constraints = constraints};
+fun make_consts (decls, constraints) = Consts {decls = decls, constraints = constraints};
+fun map_consts f (Consts {decls, constraints}) = make_consts (f (decls, constraints));
-fun map_consts f (Consts {declarations, constraints}) =
- make_consts (f (declarations, constraints));
-
-fun dest (Consts {declarations = (space, decls), constraints}) =
- {declarations = (space, Symtab.map (#1 o #1) decls),
+fun dest (Consts {decls = (space, decls), constraints}) =
+ {constants = (space, Symtab.fold
+ (fn (c, (LogicalConst (T, _), _)) => Symtab.update (c, (T, NONE))
+ | (c, (Abbreviation (T, t), _)) => Symtab.update (c, (T, SOME t))) decls Symtab.empty),
constraints = (space, constraints)};
-fun space (Consts {declarations = (space, _), ...}) = space;
+fun space (Consts {decls, ...}) = #1 decls;
(* lookup consts *)
-fun the_const (Consts {declarations = (_, decls), ...}) c =
- (case Symtab.lookup decls c of SOME (decl, _) => decl
- | NONE => raise TYPE ("Undeclared constant " ^ quote c, [], []));
+fun err_undeclared c = raise TYPE ("Undeclared constant: " ^ quote c, [], []);
+
+fun the_const (Consts {decls = (_, tab), ...}) c =
+ (case Symtab.lookup tab c of SOME (decl, _) => decl | NONE => err_undeclared c);
+
+fun logical_const consts c =
+ (case the_const consts c of LogicalConst d => d | _ => err_undeclared c);
-fun declaration consts c = #1 (the_const consts c);
+fun declaration consts c = #1 (logical_const consts c);
+fun monomorphic consts c = null (#2 (logical_const consts c));
+
+fun expansion tsig consts (c, T) =
+ (case the_const consts c of
+ Abbreviation a => SOME (Envir.expand_atom tsig T a)
+ | _ => NONE);
fun constraint (consts as Consts {constraints, ...}) c =
(case Symtab.lookup constraints c of
SOME T => T
- | NONE => declaration consts c);
+ | NONE => (case the_const consts c of LogicalConst (T, _) => T | Abbreviation (T, _) => T));
+
+
+(* certify: check/expand consts -- without beta normalization *)
+
+fun certify pp tsig consts tm =
+ let
+ fun err msg = raise TYPE (msg, [], [tm]);
+ fun show_const (c, T) = quote c ^ " :: " ^ Pretty.string_of_typ pp T;
-fun monomorphic consts c = null (#2 (the_const consts c));
+ fun cert (t as Const (c, T)) =
+ (case the_const consts c of
+ LogicalConst (U, _) =>
+ if Type.typ_instance tsig (T, U) then t
+ else err ("Illegal type for constant " ^ show_const (c, T))
+ | Abbreviation (U, u) =>
+ Envir.expand_atom tsig T (U, u) handle TYPE _ =>
+ err ("Illegal type for abbreviation " ^ show_const (c, T)))
+ | cert (t $ u) = cert t $ cert u
+ | cert (Abs (x, T, t)) = Abs (x, T, cert t)
+ | cert a = a;
+ in cert tm end;
(* typargs -- view actual const type as instance of declaration *)
@@ -67,7 +104,7 @@
| sub T [] = T
| sub T _ = raise Subscript;
-fun typargs consts (c, T) = map (sub T) (#2 (the_const consts c));
+fun typargs consts (c, T) = map (sub T) (#2 (logical_const consts c));
fun instance consts (c, Ts) =
let
@@ -77,7 +114,7 @@
-(** build consts **)
+(** declare consts **)
fun err_dup_consts cs =
error ("Duplicate declaration of constant(s) " ^ commas_quote cs);
@@ -85,28 +122,43 @@
fun err_inconsistent_constraints cs =
error ("Inconsistent type constraints for constant(s) " ^ commas_quote cs);
+fun extend_decls naming decl tab = NameSpace.extend_table naming (tab, [decl])
+ handle Symtab.DUPS cs => err_dup_consts cs;
-(* declarations etc. *)
+
+(* name space *)
-fun args_of declT =
+fun hide fully c = map_consts (fn (decls, constraints) =>
+ (apfst (NameSpace.hide fully c) decls, constraints));
+
+
+(* declarations *)
+
+fun declare naming (c, declT) = map_consts (fn (decls, constraints) =>
let
- fun args (Type (_, Ts)) pos = args_list Ts 0 pos
- | args (TVar v) pos = insert (eq_fst op =) (v, rev pos)
- | args (TFree _) _ = I
- and args_list (T :: Ts) i is = args T (i :: is) #> args_list Ts (i + 1) is
- | args_list [] _ _ = I;
- in map #2 (rev (args declT [] [])) end;
+ fun args_of (Type (_, Ts)) pos = args_of_list Ts 0 pos
+ | args_of (TVar v) pos = insert (eq_fst op =) (v, rev pos)
+ | args_of (TFree _) _ = I
+ and args_of_list (T :: Ts) i is = args_of T (i :: is) #> args_of_list Ts (i + 1) is
+ | args_of_list [] _ _ = I;
+ val decl = (c, (LogicalConst (declT, map #2 (rev (args_of declT [] []))), serial ()));
+ in (extend_decls naming decl decls, constraints) end);
-fun declare naming (c, T) = map_consts (apfst (fn declarations =>
+
+(* abbreviations *)
+
+fun abbreviate pp tsig naming (c, rhs) consts =
+ consts |> map_consts (fn (decls, constraints) =>
let
- val decl = (c, ((T, args_of T), serial ()));
- val declarations' = NameSpace.extend_table naming (declarations, [decl])
- handle Symtab.DUPS cs => err_dup_consts cs;
- in declarations' end));
+ val rhs' = Envir.beta_norm (certify pp tsig consts rhs);
+ val decl = (c, (Abbreviation (Term.fastype_of rhs', rhs'), serial ()));
+ in (extend_decls naming decl decls, constraints) end);
+
-val constrain = map_consts o apsnd o Symtab.update;
+(* constraints *)
-fun hide fully c = map_consts (apfst (apfst (NameSpace.hide fully c)));
+fun constrain (c, T) =
+ map_consts (fn (decls, constraints) => (decls, Symtab.update (c, T) constraints));
(* empty and merge *)
@@ -114,13 +166,13 @@
val empty = make_consts (NameSpace.empty_table, Symtab.empty);
fun merge
- (Consts {declarations = declarations1, constraints = constraints1},
- Consts {declarations = declarations2, constraints = constraints2}) =
+ (Consts {decls = decls1, constraints = constraints1},
+ Consts {decls = decls2, constraints = constraints2}) =
let
- val declarations = NameSpace.merge_tables (eq_snd (op =)) (declarations1, declarations2)
+ val decls' = NameSpace.merge_tables (eq_snd (op =)) (decls1, decls2)
handle Symtab.DUPS cs => err_dup_consts cs;
- val constraints = Symtab.merge (op =) (constraints1, constraints2)
+ val constraints' = Symtab.merge (op =) (constraints1, constraints2)
handle Symtab.DUPS cs => err_inconsistent_constraints cs;
- in make_consts (declarations, constraints) end;
+ in make_consts (decls', constraints') end;
end;