Move ambient environment defaults into Env.env

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

diff --git a/src/env.sml b/src/env.sml
index db92e6e..3b08094 100644 (file)
--- a/src/env.sml
+++ b/src/env.sml
@@ -1,5 +1,6 @@
 (* HCoop Domtool (http://hcoop.sourceforge.net/)
  * Copyright (c) 2006, Adam Chlipala
+ * Copyright (c) 2014 Clinton Ebadi <clinton@unknownlamer.org>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -41,6 +42,11 @@ fun registerContainer (name, befor, after) =
     containers := SM.insert (!containers, name, (befor, after))
 fun container name = SM.find (!containers, name)
 
+val functions : (exp list -> exp option) SM.map ref = ref SM.empty
+fun registerFunction (name, f) =
+    functions := SM.insert (!functions, name, f)
+fun function name = SM.find (!functions, name)
+
 local
     val pr = ref (fn () => ())
 in
@@ -100,6 +106,10 @@ fun int (EInt n, _) = SOME n
 fun string (EString s, _) = SOME s
   | string _ = NONE
 
+fun bool (EVar "false", _) = SOME false
+  | bool (EVar "true", _) = SOME true
+  | bool _ = NONE
+
 fun mapFail f [] = SOME []
   | mapFail f (h :: t) =
     case f h of
@@ -131,6 +141,28 @@ fun two func (name1, arg1, name2, arg2) f (_, [e1, e2]) =
                                SM.empty))
   | two func _ _ (_, es) = badArgs (func, es)
 
+fun three func (name1, arg1, name2, arg2, name3, arg3) f (_, [e1, e2, e3]) =
+    (case (arg1 e1, arg2 e2, arg3 e3) of
+        (NONE, _, _) => badArg (func, name1, e1)
+       | (_, NONE, _) => badArg (func, name2, e2)
+       | (_, _, NONE) => badArg (func, name3, e3)
+       | (SOME v1, SOME v2, SOME v3) => (f (v1, v2, v3);
+                                        SM.empty))
+  | three func _ _ (_, es) = badArgs (func, es)
+
+fun four func (name1, arg1, name2, arg2, name3, arg3, name4, arg4) f (_, [e1, e2, e3, e4]) =
+    (case (arg1 e1, arg2 e2, arg3 e3, arg4 e4) of
+        (NONE, _, _, _) => badArg (func, name1, e1)
+       | (_, NONE, _, _) => badArg (func, name2, e2)
+       | (_, _, NONE, _) => badArg (func, name3, e3)
+       | (_, _, _, NONE) => badArg (func, name4, e4)
+       | (SOME v1, SOME v2, SOME v3, SOME v4) => (f (v1, v2, v3, v4);
+                                                 SM.empty))
+  | four func _ _ (_, es) = badArgs (func, es)
+
+fun noneV func f (evs, []) = (f evs;
+                             SM.empty)
+  | noneV func _ (_, es) = badArgs (func, es)
 
 fun oneV func (name, arg) f (evs, [e]) =
     (case arg e of
@@ -153,7 +185,9 @@ fun env arg (evs, name) =
        NONE => raise Fail ("Unavailable environment variable " ^ name)
       | SOME e =>
        case arg e of
-           NONE => raise Fail ("Bad format for environment variable " ^ name)
+           NONE => (Print.preface ("Unexpected value for " ^ name ^ ":",
+                                   Print.p_exp e);
+                    raise Fail ("Bad format for environment variable " ^ name))
          | SOME v => v
 
 fun type_one func arg f =
@@ -165,6 +199,8 @@ fun type_one func arg f =
 fun action_none name f = registerAction (name, none name f)
 fun action_one name args f = registerAction (name, one name args f)
 fun action_two name args f = registerAction (name, two name args f)
+fun action_three name args f = registerAction (name, three name args f)
+fun action_four name args f = registerAction (name, four name args f)
 
 fun actionV_none name f = registerAction (name, fn (env, _) => (f env; env))
 fun actionV_one name args f = registerAction (name, oneV name args f)
@@ -173,28 +209,42 @@ fun actionV_two name args f = registerAction (name, twoV name args f)
 fun container_none name (f, g) = registerContainer (name, none name f, g)
 fun container_one name args (f, g) = registerContainer (name, one name args f, g)
 
+fun containerV_none name (f, g) = registerContainer (name, noneV name f, g)
 fun containerV_one name args (f, g) = registerContainer (name, oneV name args f, g)
 
-type env = SS.set * (typ * exp option) SM.map * SS.set
-val empty : env = (SS.empty, SM.empty, SS.empty)
+type env = SS.set * (typ * exp option) SM.map * SS.set * (typ * exp) SM.map
+val empty : env = (SS.empty, SM.empty, SS.empty, SM.empty)
+
+
+fun initialDynEnvTypes (_, _, _, ds) =
+    SM.map (fn (t, e) => t) ds
 
-fun lookupType (ts, _, _) name = SS.member (ts, name)
-fun lookupVal (_, vs, _) name =
+fun initialDynEnvVals (_, _, _, ds) =
+    SM.map (fn (t, v) => v) ds
+
+fun lookupType (ts, _, _, _) name = SS.member (ts, name)
+fun lookupVal (_, vs, _, _) name =
     case SM.find (vs, name) of
        NONE => NONE
       | SOME (t, _) => SOME t
-fun lookupEquation (_, vs, _) name =
+fun lookupEquation (_, vs, _, _) name =
     case SM.find (vs, name) of
        NONE => NONE
       | SOME (_, eqo) => eqo
-fun lookupContext (_, _, cs) name = SS.member (cs, name)
+fun lookupContext (_, _, cs, _) name = SS.member (cs, name)
+fun lookupInitialDynEnvVal (_, _, _, ds) name =
+    case SM.find (ds, name) of
+       NONE => NONE
+      | SOME (t, _) => SOME t
 
-fun bindType (ts, vs, cs) name = (SS.add (ts, name), vs, cs)
-fun bindVal (ts, vs, cs) (name, t, eqo) = (ts, SM.insert (vs, name, (t, eqo)), cs)
-fun bindContext (ts, vs, cs) name = (ts, vs, SS.add (cs, name))
+fun bindType (ts, vs, cs, ds) name = (SS.add (ts, name), vs, cs, ds)
+fun bindVal (ts, vs, cs, ds) (name, t, eqo) = (ts, SM.insert (vs, name, (t, eqo)), cs, ds)
+fun bindContext (ts, vs, cs, ds) name = (ts, vs, SS.add (cs, name), ds)
+fun bindInitialDynEnvVal (ts, vs, cs, ds) (name, t, eqn) = (ts, vs, cs, SM.insert (ds, name, (t, eqn)))
 
-fun types (ts, _, _) = ts
-fun vals (_, vs, _) = SM.foldli (fn (name, _, vs) => SS.add (vs, name)) SS.empty vs
-fun contexts (_, _, cs) = cs
+fun types (ts, _, _, _) = ts
+fun vals (_, vs, _, _) = SM.foldli (fn (name, _, vs) => SS.add (vs, name)) SS.empty vs
+fun contexts (_, _, cs, _) = cs
+fun dynamics (_, _, _, ds) = SM.foldli (fn (name, _, ds) => SS.add (ds, name)) SS.empty ds
 
 end