Reduction

[hcoop/domtool2.git] / src / env.sig

diff --git a/src/env.sig b/src/env.sig
new file mode 100644 (file)
index 0000000..cc68b53
--- /dev/null
+++ b/src/env.sig
@@ -0,0 +1,33 @@
+(* 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.
+*)
+
+(* Domtool type-checking and reduction environments *)
+
+signature ENV = sig
+
+    type env
+    val empty : env
+
+    val bindType : env -> string -> env
+    val bindVal : env -> string * Ast.typ * Ast.exp option -> env
+
+    val lookupType : env -> string -> bool
+    val lookupVal : env -> string -> Ast.typ option
+    val lookupEquation : env -> string -> Ast.exp option
+
+end