clean up demo code

[coq-hetmet.git] / src / General.v

diff --git a/src/General.v b/src/General.v
index f97989d..ee5cb16 100644 (file)
--- a/src/General.v
+++ b/src/General.v
@@ -106,6 +106,11 @@ Fixpoint treeReduce {T:Type}{R:Type}(mapLeaf:T->R)(mergeBranches:R->R->R) (t:Tre
   end.
 Definition treeDecomposition {D T:Type} (mapLeaf:T->D) (mergeBranches:D->D->D) :=
   forall d:D, { tt:Tree T & d = treeReduce mapLeaf mergeBranches tt }.
+Lemma mapOptionTree_distributes
+  : forall T R (a b:Tree ??T) (f:T->R),
+    mapOptionTree f (a,,b) = (mapOptionTree f a),,(mapOptionTree f b).
+  reflexivity.
+  Qed.
 
 Fixpoint reduceTree {T}(unit:T)(merge:T -> T -> T)(tt:Tree ??T) : T :=
   match tt with
@@ -478,6 +483,7 @@ Fixpoint listToString {T:Type}{tst:ToString T}(l:list T) : string :=
 Instance ListToString {T:Type}{tst:ToString T} : ToString (list T) :=
   { toString := @listToString _ _ }.
 
+
 (*******************************************************************************)
 (* Tree Flags                                                                  *)
 
@@ -519,6 +525,12 @@ Fixpoint takeT {T}{Σ:Tree T}(tf:TreeFlags Σ) : ??(Tree T) :=
       end
   end.
 
+Definition takeT' {T}{Σ:Tree ??T}(tf:TreeFlags Σ) : Tree ??T :=
+  match takeT tf with
+    | None   => []
+    | Some x => x
+  end.
+
 (* lift a function T->bool to a function (option T)->bool by yielding (None |-> b) *)
 Definition liftBoolFunc {T}(b:bool)(f:T -> bool) : ??T -> bool :=
   fun t =>
@@ -865,6 +877,8 @@ Definition map2 {A}{B}(f:A->B)(t:A*A) : (B*B) := ((f (fst t)), (f (snd t))).
 
 (* boolean "not" *)
 Definition bnot (b:bool) : bool := if b then false else true.
+Definition band (b1 b2:bool) : bool := if b1 then b2 else false.
+Definition bor  (b1 b2:bool) : bool := if b1 then true else b2.
 
 (* string stuff *)
 Variable eol : string.
@@ -952,6 +966,16 @@ Lemma list2vecOrFail {T}(l:list T)(n:nat)(error_message:nat->nat->string) : ???(
     apply (Error (error_message (length l) n)).
     Defined.
 
+(* this makes a type function application, ensuring not to oversaturate it (though if it was undersaturated we can't fix that) *)
+Fixpoint split_list {T}(l:list T)(n:nat) : ???(list T * list T) :=
+  match n with
+    | O    => OK (nil , l)
+    | S n' => match l with
+                | nil  => Error "take_list failed"
+                | h::t => split_list t n' >>= fun t' => let (t1,t2) := t' in OK ((h::t1),t2)
+              end
+    end.
+
 (* Uniques *)
 Variable UniqSupply      : Type.                   Extract Inlined Constant UniqSupply     => "UniqSupply.UniqSupply".
 Variable Unique          : Type.                   Extract Inlined Constant Unique         => "Unique.Unique".