1 files changed, 71 insertions, 0 deletions
diff --git a/lib/expression/lazier.ml b/lib/expression/lazier.ml
new file mode 100644
index 0000000..d8b12d9
--- /dev/null
+++ b/lib/expression/lazier.ml
@@ -0,0 +1,71 @@
+open StdLabels
+
+(** Make a module lazy *)
+module Make (S : Sym.SYM_EXPR) = struct
+  type 'a repr = 'a S.repr Lazy.t
+  type 'a obs = 'a S.obs Lazy.t
+  type 'a path_repr = 'a S.path_repr
+
+  let empty : unit -> 'a repr = fun () -> lazy (S.empty ())
+
+  let expr : 'a repr -> 'a repr =
+   fun expr -> Lazy.map (fun expr -> S.expr expr) expr
+
+  let literal : string -> 'a repr = fun l -> lazy (S.literal l)
+  let integer : string -> 'a repr = fun i -> lazy (S.integer i)
+
+  let path : 'b path_repr -> 'b -> 'a repr =
+   fun repr path -> lazy (S.path repr path)
+
+  let concat : 'a repr list -> 'a repr =
+   fun exprs ->
+    lazy
+      (let exprs' = List.map ~f:Lazy.force exprs in
+       S.concat exprs')
+
+  let window : 'a repr T.window -> 'a repr list -> 'a repr list -> 'a repr =
+   fun w group sort ->
+    lazy
+      (let w' = T.map_window ~f:Lazy.force w
+       and group' = List.map ~f:Lazy.force group
+       and sort' = List.map ~f:Lazy.force sort in
+       S.window w' group' sort')
+
+  let nvl : 'a repr list -> 'a repr =
+   fun exprs ->
+    lazy
+      (let exprs' = List.map ~f:Lazy.force exprs in
+       S.nvl exprs')
+
+  let join : string -> 'a repr list -> 'a repr =
+   fun sep exprs ->
+    lazy
+      (let exprs' = List.map ~f:Lazy.force exprs in
+       S.join sep exprs')
+
+  let boperator : T.binary_operator -> 'a repr -> 'a repr -> 'a repr =
+   fun op e1 e2 ->
+    lazy
+      (let e1' = Lazy.force e1 and e2' = Lazy.force e2 in
+       S.boperator op e1' e2')
+
+  let gequality : T.binary_operator -> 'a repr -> 'a repr list -> 'a repr =
+   fun op e exprs ->
+    lazy
+      (let e' = Lazy.force e and exprs' = List.map ~f:Lazy.force exprs in
+       S.gequality op e' exprs')
+
+  let funct : string -> 'a repr list -> 'a repr =
+   fun name exprs ->
+    lazy
+      (let exprs' = List.map ~f:Lazy.force exprs in
+       S.funct name exprs')
+
+  let function' : T.funct -> 'a repr list -> 'a repr =
+   fun f exprs ->
+    lazy
+      (let exprs' = List.map ~f:Lazy.force exprs in
+       S.function' f exprs')
+
+  let observe : 'a repr -> 'a obs = fun v -> Lazy.map S.observe v
+end