# HG changeset patch
# User wenzelm
# Date 1082633207 -7200
# Node ID c7cc01735801695385d1cc1d928248145a5b6e2f
# Parent  765badface6a7f9be64fd071d872e80a29224cee
'constdefs' with automatic type-inference and structure context;

diff -r 765badface6a -r c7cc01735801 src/Pure/Isar/constdefs.ML
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/Isar/constdefs.ML	Thu Apr 22 13:26:47 2004 +0200
@@ -0,0 +1,68 @@
+(*  Title:      Pure/Isar/constdefs.ML
+    ID:         $Id$
+    Author:     Makarius, Hagia Maria Sion Abbey (Jerusalem)
+    License:    GPL (GNU GENERAL PUBLIC LICENSE)
+
+Standard constant definitions, with type-inference and optional
+structure context; specifications need to observe strictly sequential
+dependencies; no support for overloading.
+*)
+
+signature CONSTDEFS =
+sig
+  val add_constdefs: (string list * string option) list *
+    ((bstring * string option * Syntax.mixfix) option *
+      ((bstring * Args.src list) * string)) list
+    -> theory -> theory
+  val add_constdefs_i: (string list * typ option) list *
+    ((bstring * typ option * Syntax.mixfix) option *
+      ((bstring * theory attribute list) * term)) list
+    -> theory -> theory
+end;
+
+structure Constdefs: CONSTDEFS =
+struct
+
+(** add_constdefs(_i) **)
+
+fun gen_constdef prep_typ prep_term prep_att
+    structs (thy, (decl, ((raw_name, raw_atts), raw_prop))) =
+  let
+    val ctxt =
+      ProofContext.init thy |> ProofContext.add_fixes
+        (flat (map (fn (As, T) => map (fn A => (A, T, None)) As) structs));
+    val (ctxt', mx) =
+      (case decl of None => (ctxt, Syntax.NoSyn) | Some (x, raw_T, mx) =>
+        (ProofContext.add_fixes [(x, apsome (prep_typ ctxt) raw_T, Some mx)] ctxt, mx));
+
+    val prop = prep_term ctxt' raw_prop;
+    fun err msg = raise TERM (msg, [prop]);
+
+    val (lhs, _) = Logic.dest_equals (Logic.strip_imp_concl prop)
+      handle TERM _ => err "Not a meta-equality (==)";
+    val (c, T) = Term.dest_Free (Term.head_of lhs)
+      handle TERM _ => err "Head of definition needs to turn out as fixed variable";
+    val _ = (case decl of None => () | Some (d, _, _) =>
+      if c = d then ()
+      else err ("Head of definition " ^ quote c ^ " differs from declaration " ^ quote d));
+
+    val full = Sign.full_name (Theory.sign_of thy);
+    val def = Term.subst_atomic [(Free (c, T), Const (full c, T))] prop;
+    val name = if raw_name = "" then Thm.def_name c else raw_name;
+    val atts = map (prep_att thy) raw_atts;
+  in
+    thy
+    |> Theory.add_consts_i [(c, T, mx)]
+    |> PureThy.add_defs_i false [((name, def), atts)] |> #1
+  end;
+
+fun gen_constdefs prep_vars prep_typ prep_term prep_att (raw_structs, specs) thy =
+  let val structs = #2 (foldl_map prep_vars (ProofContext.init thy, raw_structs))
+  in foldl (gen_constdef prep_typ prep_term prep_att structs) (thy, specs) end;
+
+val add_constdefs = gen_constdefs ProofContext.read_vars
+  ProofContext.read_typ ProofContext.read_term Attrib.global_attribute;
+val add_constdefs_i = gen_constdefs ProofContext.cert_vars
+  ProofContext.cert_typ ProofContext.cert_term (K I);
+
+end;