Server executing client's requested configuration with the right permissions

[hcoop/domtool2.git] / src / defaults.sml

diff --git a/src/defaults.sml b/src/defaults.sml
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+++ b/src/defaults.sml
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+(* HCoop Domtool (http://hcoop.sourceforge.net/)
+ * Copyright (c) 2006, Adam Chlipala
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *)
+
+(* Default record field database *)
+
+structure Defaults :> DEFAULTS = struct
+
+open Ast Print
+
+structure SM = StringMap
+
+val dmy = ErrorMsg.dummyLoc
+
+val defaultT : record ref = ref SM.empty
+val defaultV : (unit -> exp) SM.map ref = ref SM.empty
+
+fun registerDefault (name, t, v) =
+    case SM.find (!defaultT, name) of
+       NONE => (defaultT := SM.insert (!defaultT, name, t);
+                defaultV := SM.insert (!defaultV, name, v))
+      | SOME _ => raise Fail "Duplicate default environment variable"
+
+fun tInit () = (TAction ((CRoot, dmy),
+                        !defaultT,
+                        StringMap.empty),
+               dmy)
+
+fun eInit () = SM.map (fn f => f ()) (!defaultV)
+
+
+end