--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/prepare.sml	Sun Sep 07 09:28:13 2008 -0400
@@ -0,0 +1,180 @@
+(* Copyright (c) 2008, Adam Chlipala
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ * - The names of contributors may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *)
+
+structure Prepare :> PREPARE = struct
+
+open Cjr
+
+fun prepString (e, ss, n) =
+    case #1 e of
+        EPrim (Prim.String s) =>
+        SOME (s :: ss, n)
+      | EFfiApp ("Basis", "strcat", [e1, e2]) =>
+        (case prepString (e1, ss, n) of
+             NONE => NONE
+           | SOME (ss, n) => prepString (e2, ss, n))
+      | EFfiApp ("Basis", "sqlifyInt", [e]) =>
+        SOME ("$" ^ Int.toString (n + 1) ^ "::int8" :: ss, n + 1)
+      | EFfiApp ("Basis", "sqlifyFloat", [e]) =>
+        SOME ("$" ^ Int.toString (n + 1) ^ "::float8" :: ss, n + 1)
+      | EFfiApp ("Basis", "sqlifyString", [e]) =>
+        SOME ("$" ^ Int.toString (n + 1) ^ "::text" :: ss, n + 1)
+      | EFfiApp ("Basis", "sqlifyBool", [e]) =>
+        SOME ("$" ^ Int.toString (n + 1) ^ "::bool" :: ss, n + 1)
+
+      | _ => NONE
+
+fun prepExp (e as (_, loc), sns) =
+    case #1 e of
+        EPrim _ => (e, sns)
+      | ERel _ => (e, sns)
+      | ENamed _ => (e, sns)
+      | ECon (_, _, NONE) => (e, sns)
+      | ECon (dk, pc, SOME e) =>
+        let
+            val (e, sns) = prepExp (e, sns)
+        in
+            ((ECon (dk, pc, SOME e), loc), sns)
+        end
+      | EFfi _ => (e, sns)
+      | EFfiApp (m, x, es) =>
+        let
+            val (es, sns) = ListUtil.foldlMap prepExp sns es
+        in
+            ((EFfiApp (m, x, es), loc), sns)
+        end
+      | EApp (e1, e2) =>
+        let
+            val (e1, sns) = prepExp (e1, sns)
+            val (e2, sns) = prepExp (e2, sns)
+        in
+            ((EApp (e1, e2), loc), sns)
+        end
+
+      | ERecord (rn, xes) =>
+        let
+            val (xes, sns) = ListUtil.foldlMap (fn ((x, e), sns) =>
+                                                   let
+                                                       val (e, sns) = prepExp (e, sns)
+                                                   in
+                                                       ((x, e), sns)
+                                                   end) sns xes
+        in
+            ((ERecord (rn, xes), loc), sns)
+        end
+      | EField (e, s) =>
+        let
+            val (e, sns) = prepExp (e, sns)
+        in
+            ((EField (e, s), loc), sns)
+        end
+
+      | ECase (e, pes, ts) =>
+        let
+            val (e, sns) = prepExp (e, sns)
+            val (pes, sns) = ListUtil.foldlMap (fn ((p, e), sns) =>
+                                                   let
+                                                       val (e, sns) = prepExp (e, sns)
+                                                   in
+                                                       ((p, e), sns)
+                                                   end) sns pes
+        in
+            ((ECase (e, pes, ts), loc), sns)
+        end
+
+      | EWrite e =>
+        let
+            val (e, sns) = prepExp (e, sns)
+        in
+            ((EWrite e, loc), sns)
+        end
+      | ESeq (e1, e2) =>
+        let
+            val (e1, sns) = prepExp (e1, sns)
+            val (e2, sns) = prepExp (e2, sns)
+        in
+            ((ESeq (e1, e2), loc), sns)
+        end
+      | ELet (x, t, e1, e2) =>
+        let
+            val (e1, sns) = prepExp (e1, sns)
+            val (e2, sns) = prepExp (e2, sns)
+        in
+            ((ELet (x, t, e1, e2), loc), sns)
+        end
+
+      | EQuery {exps, tables, rnum, state, query, body, initial, ...} =>
+        (case prepString (query, [], 0) of
+             NONE => (e, sns)
+           | SOME (ss, n) =>
+             ((EQuery {exps = exps, tables = tables, rnum = rnum,
+                       state = state, query = query, body = body,
+                       initial = initial, prepared = SOME (#2 sns)}, loc),
+              ((String.concat (rev ss), n) :: #1 sns, #2 sns + 1)))
+
+fun prepDecl (d as (_, loc), sns) =
+    case #1 d of
+        DStruct _ => (d, sns)
+      | DDatatype _ => (d, sns)
+      | DDatatypeForward _ => (d, sns)
+      | DVal (x, n, t, e) =>
+        let
+            val (e, sns) = prepExp (e, sns)
+        in
+            ((DVal (x, n, t, e), loc), sns)
+        end
+      | DFun (x, n, xts, t, e) =>
+        let
+            val (e, sns) = prepExp (e, sns)
+        in
+            ((DFun (x, n, xts, t, e), loc), sns)
+        end
+      | DFunRec fs =>
+        let
+            val (fs, sns) = ListUtil.foldlMap (fn ((x, n, xts, t, e), sns) =>
+                                                  let
+                                                      val (e, sns) = prepExp (e, sns)
+                                                  in
+                                                      ((x, n, xts, t, e), sns)
+                                                  end) sns fs
+        in
+            ((DFunRec fs, loc), sns)
+        end
+
+      | DTable _ => (d, sns)
+      | DDatabase _ => (d, sns)
+      | DPreparedStatements _ => (d, sns)
+
+fun prepare (ds, ps) =
+    let
+        val (ds, (sns, _)) = ListUtil.foldlMap prepDecl ([], 0) ds
+    in
+        ((DPreparedStatements (rev sns), ErrorMsg.dummySpan) :: ds, ps)
+    end
+
+end
+