* 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 *)
structure SS = StringSet
structure SM = StringMap
+type typeRule = exp -> bool
+val typeRules : typeRule SM.map ref = ref SM.empty
+fun registerType (name, rule) = typeRules := SM.insert (!typeRules, name, rule)
+fun typeRule name = SM.find (!typeRules, name)
+
+type env_vars = exp SM.map
+type action = env_vars * Ast.exp list -> env_vars
+val actions : action SM.map ref = ref SM.empty
+fun registerAction (name, action) = actions := SM.insert (!actions, name, action)
+fun action name = SM.find (!actions, name)
+
+val containers : (action * (unit -> unit)) SM.map ref = ref SM.empty
+fun registerContainer (name, befor, after) =
+ containers := SM.insert (!containers, name, (befor, after))
+fun container name = SM.find (!containers, name)
+
+fun badArgs name = raise Fail ("Invalid arguments to " ^ name)
+
type env = SS.set * (typ * exp option) SM.map
val empty : env = (SS.add (SS.singleton "int", "string"),
SM.empty)