--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/expl_rename.sml	Thu Feb 20 10:27:15 2014 -0500
@@ -0,0 +1,431 @@
+(* Copyright (c) 2014, 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 ExplRename :> EXPL_RENAME = struct
+
+open Expl
+structure E = ExplEnv
+
+structure IM = IntBinaryMap
+
+structure St :> sig
+    type t
+
+    val create : int -> t
+    val next : t -> int
+
+    val bind : t * int -> t * int
+    val lookup: t * int -> int option
+end = struct
+
+type t = {next : int,
+          renaming : int IM.map}
+
+fun create next = {next = next,
+                   renaming = IM.empty}
+
+fun next (t : t) = #next t
+
+fun bind ({next, renaming}, n) =
+    ({next = next + 1,
+      renaming = IM.insert (renaming, n, next)}, next)
+
+fun lookup ({next, renaming}, n) =
+    IM.find (renaming, n)
+
+end
+
+fun renameCon st (all as (c, loc)) =
+    case c of
+        TFun (c1, c2) => (TFun (renameCon st c1, renameCon st c2), loc)
+      | TCFun (x, k, c) => (TCFun (x, k, renameCon st c), loc)
+      | TRecord c => (TRecord (renameCon st c), loc)
+      | CRel _ => all
+      | CNamed n =>
+        (case St.lookup (st, n) of
+             NONE => all
+           | SOME n' => (CNamed n', loc))
+      | CModProj (n, ms, x) =>
+        (case St.lookup (st, n) of
+             NONE => all
+           | SOME n' => (CModProj (n', ms, x), loc))
+      | CApp (c1, c2) => (CApp (renameCon st c1, renameCon st c2), loc)
+      | CAbs (x, k, c) => (CAbs (x, k, renameCon st c), loc)
+      | CKAbs (x, c) => (CKAbs (x, renameCon st c), loc)
+      | CKApp (c, k) => (CKApp (renameCon st c, k), loc)
+      | TKFun (x, c) => (TKFun (x, renameCon st c), loc)
+      | CName _ => all
+      | CRecord (k, xcs) => (CRecord (k, map (fn (x, c) => (renameCon st x, renameCon st c)) xcs), loc)
+      | CConcat (c1, c2) => (CConcat (renameCon st c1, renameCon st c2), loc)
+      | CMap _ => all
+      | CUnit => all
+      | CTuple cs => (CTuple (map (renameCon st) cs), loc)
+      | CProj (c, n) => (CProj (renameCon st c, n), loc)
+
+fun renamePatCon st pc =
+    case pc of
+        PConVar n =>
+        (case St.lookup (st, n) of
+             NONE => pc
+           | SOME n' => PConVar n')
+      | PConProj (n, ms, x) =>
+        (case St.lookup (st, n) of
+             NONE => pc
+           | SOME n' => PConProj (n', ms, x))
+
+fun renamePat st (all as (p, loc)) =
+    case p of
+        PWild => all
+      | PVar (x, c) => (PVar (x, renameCon st c), loc)
+      | PPrim _ => all
+      | PCon (dk, pc, cs, po) => (PCon (dk, renamePatCon st pc,
+                                        map (renameCon st) cs,
+                                        Option.map (renamePat st) po), loc)
+      | PRecord xpcs => (PRecord (map (fn (x, p, c) =>
+                                          (x, renamePat st p, renameCon st c)) xpcs), loc)
+
+fun renameExp st (all as (e, loc)) =
+    case e of
+        EPrim _ => all
+      | ERel _ => all
+      | ENamed n =>
+        (case St.lookup (st, n) of
+             NONE => all
+           | SOME n' => (ENamed n', loc))
+      | EModProj (n, ms, x) =>
+        (case St.lookup (st, n) of
+             NONE => all
+           | SOME n' => (EModProj (n', ms, x), loc))
+      | EApp (e1, e2) => (EApp (renameExp st e1, renameExp st e2), loc)
+      | EAbs (x, dom, ran, e) => (EAbs (x, renameCon st dom, renameCon st ran, renameExp st e), loc)
+      | ECApp (e, c) => (ECApp (renameExp st e, renameCon st c), loc)
+      | ECAbs (x, k, e) => (ECAbs (x, k, renameExp st e), loc)
+      | EKAbs (x, e) => (EKAbs (x, renameExp st e), loc)
+      | EKApp (e, k) => (EKApp (renameExp st e, k), loc)
+      | ERecord xecs => (ERecord (map (fn (x, e, c) => (renameCon st x,
+                                                        renameExp st e,
+                                                        renameCon st c)) xecs), loc)
+      | EField (e, c, {field, rest}) => (EField (renameExp st e,
+                                                 renameCon st c,
+                                                 {field = renameCon st field,
+                                                  rest = renameCon st rest}), loc)
+      | EConcat (e1, c1, e2, c2) => (EConcat (renameExp st e1,
+                                              renameCon st c1,
+                                              renameExp st e2,
+                                              renameCon st c2), loc)
+      | ECut (e, c, {field, rest}) => (ECut (renameExp st e,
+                                             renameCon st c,
+                                             {field = renameCon st field,
+                                              rest = renameCon st rest}), loc)
+      | ECutMulti (e, c, {rest}) => (ECutMulti (renameExp st e,
+                                                renameCon st c,
+                                                {rest = renameCon st rest}), loc)
+      | ECase (e, pes, {disc, result}) => (ECase (renameExp st e,
+                                                  map (fn (p, e) => (renamePat st p, renameExp st e)) pes,
+                                                  {disc = renameCon st disc,
+                                                   result = renameCon st result}), loc)
+      | EWrite e => (EWrite (renameExp st e), loc)
+      | ELet (x, c1, e1, e2) => (ELet (x, renameCon st c1,
+                                      renameExp st e1,
+                                      renameExp st e2), loc)
+
+fun renameSitem st (all as (si, loc)) =
+    case si of
+        SgiConAbs _ => all
+      | SgiCon (x, n, k, c) => (SgiCon (x, n, k, renameCon st c), loc)
+      | SgiDatatype dts => (SgiDatatype (map (fn (x, n, xs, cns) =>
+                                                 (x, n, xs,
+                                                  map (fn (x, n, co) =>
+                                                          (x, n, Option.map (renameCon st) co)) cns)) dts),
+                            loc)
+      | SgiDatatypeImp (x, n, n', xs, x', xs', cns) =>
+        (SgiDatatypeImp (x, n, n', xs, x', xs',
+                         map (fn (x, n, co) =>
+                                 (x, n, Option.map (renameCon st) co)) cns), loc)
+      | SgiVal (x, n, c) => (SgiVal (x, n, renameCon st c), loc)
+      | SgiSgn (x, n, sg) => (SgiSgn (x, n, renameSgn st sg), loc)
+      | SgiStr (x, n, sg) => (SgiStr (x, n, renameSgn st sg), loc)
+
+and renameSgn st (all as (sg, loc)) =
+    case sg of
+        SgnConst sis => (SgnConst (map (renameSitem st) sis), loc)
+      | SgnVar n =>
+        (case St.lookup (st, n) of
+             NONE => all
+           | SOME n' => (SgnVar n', loc))
+      | SgnFun (x, n, dom, ran) => (SgnFun (x, n, renameSgn st dom, renameSgn st ran), loc)
+      | SgnWhere (sg, xs, s, c) => (SgnWhere (renameSgn st sg, xs, s, renameCon st c), loc)
+      | SgnProj (n, ms, x) =>
+        (case St.lookup (st, n) of
+             NONE => all
+           | SOME n' => (SgnProj (n', ms, x), loc))
+
+fun renameDecl st (all as (d, loc)) =
+    case d of
+        DCon (x, n, k, c) => (DCon (x, n, k, renameCon st c), loc)
+      | DDatatype dts => (DDatatype (map (fn (x, n, xs, cns) =>
+                                             (x, n, xs,
+                                              map (fn (x, n, co) =>
+                                                      (x, n, Option.map (renameCon st) co)) cns)) dts),
+                          loc)
+      | DDatatypeImp (x, n, n', xs, x', xs', cns) =>
+        (DDatatypeImp (x, n, n', xs, x', xs',
+                       map (fn (x, n, co) =>
+                               (x, n, Option.map (renameCon st) co)) cns), loc)
+      | DVal (x, n, c, e) => (DVal (x, n, renameCon st c, renameExp st e), loc)
+      | DValRec vis => (DValRec (map (fn (x, n, c, e) => (x, n, renameCon st c, renameExp st e)) vis), loc)
+      | DSgn (x, n, sg) => (DSgn (x, n, renameSgn st sg), loc)
+      | DStr (x, n, sg, str) => (DStr (x, n, renameSgn st sg, renameStr st str), loc)
+      | DFfiStr (x, n, sg) => (DFfiStr (x, n, renameSgn st sg), loc)
+      | DExport (n, sg, str) =>
+        (case St.lookup (st, n) of
+             NONE => all
+           | SOME n' => (DExport (n', renameSgn st sg, renameStr st str), loc))
+      | DTable (n, x, m, c1, e1, c2, e2, c3) =>
+        (DTable (n, x, m, renameCon st c1, renameExp st e1, renameCon st c2,
+                 renameExp st e2, renameCon st c3), loc)
+      | DSequence _ => all
+      | DView (n, x, n', e, c) => (DView (n, x, n', renameExp st e, renameCon st c), loc)
+      | DDatabase _ => all
+      | DCookie (n, x, n', c) => (DCookie (n, x, n', renameCon st c), loc)
+      | DStyle _ => all
+      | DTask (e1, e2) => (DTask (renameExp st e1, renameExp st e2), loc)
+      | DPolicy e => (DPolicy (renameExp st e), loc)
+      | DOnError (n, xs, x) =>
+        (case St.lookup (st, n) of
+             NONE => all
+           | SOME n' => (DOnError (n', xs, x), loc))
+
+and renameStr st (all as (str, loc)) =
+    case str of
+        StrConst ds => (StrConst (map (renameDecl st) ds), loc)
+      | StrVar n =>
+        (case St.lookup (st, n) of
+             NONE => all
+           | SOME n' => (StrVar n', loc))
+      | StrProj (str, x) => (StrProj (renameStr st str, x), loc)
+      | StrFun (x, n, dom, ran, str) => (StrFun (x, n, renameSgn st dom,
+                                                 renameSgn st ran,
+                                                 renameStr st str), loc)
+      | StrApp (str1, str2) => (StrApp (renameStr st str1, renameStr st str2), loc)
+
+
+
+fun fromArity (n, loc) =
+    case n of
+        0 => (KType, loc)
+      | _ => (KArrow ((KType, loc), fromArity (n - 1, loc)), loc)
+
+fun dupDecl (all as (d, loc), st) =
+    case d of
+        DCon (x, n, k, c) =>
+        let
+            val (st, n') = St.bind (st, n)
+        in
+            ([(DCon (x, n, k, renameCon st c), loc),
+              (DCon (x, n', k, (CNamed n, loc)), loc)],
+             st)
+        end
+      | DDatatype dts =>
+        let
+            val (dts', st) = ListUtil.foldlMap (fn ((x, n, xs, cns), st) =>
+                                                   let
+                                                       val (st, n') = St.bind (st, n)
+
+                                                       val (cns', st) = ListUtil.foldlMap
+                                                                            (fn ((x, n, _), st) =>
+                                                                                let
+                                                                                    val (st, n') =
+                                                                                        St.bind (st, n)
+                                                                                in
+                                                                                    ((x, n, n'), st)
+                                                                                end) st cns
+                                                   in
+                                                       ((x, n, length xs, n', cns'), st)
+                                                   end) st dts
+
+            val d = (DDatatype (map (fn (x, n, xs, cns) =>
+                                        (x, n, xs,
+                                         map (fn (x, n, co) =>
+                                                 (x, n, Option.map (renameCon st) co)) cns)) dts),
+                     loc)
+
+            val env = E.declBinds E.empty d
+        in
+            (d
+             :: map (fn (x, n, arity, n', _) =>
+                        (DCon (x, n', fromArity (arity, loc), (CNamed n, loc)), loc)) dts'
+             @ ListUtil.mapConcat (fn (_, _, _, _, cns') =>
+                                      map (fn (x, n, n') =>
+                                              (DVal (x, n', #2 (E.lookupENamed env n), (ENamed n, loc)),
+                                               loc)) cns') dts',
+             st)
+        end
+      | DDatatypeImp (x, n, n', xs, x', xs', cns) =>
+        let
+            val (cns', st) = ListUtil.foldlMap
+                                 (fn ((x, n, _), st) =>
+                                     let
+                                         val (st, n') =
+                                             St.bind (st, n)
+                                     in
+                                         ((x, n, n'), st)
+                                     end) st cns
+
+            val (st, n') = St.bind (st, n)
+
+            val d = (DDatatypeImp (x, n, n', xs, x', xs',
+                                   map (fn (x, n, co) =>
+                                           (x, n, Option.map (renameCon st) co)) cns), loc)
+
+            val env = E.declBinds E.empty d
+        in
+            (d
+             :: (DCon (x, n', fromArity (length xs, loc), (CNamed n, loc)), loc)
+             :: map (fn (x, n, n') =>
+                        (DVal (x, n', #2 (E.lookupENamed env n), (ENamed n, loc)),
+                         loc)) cns',
+             st)
+        end
+      | DVal (x, n, c, e) =>
+        let
+            val (st, n') = St.bind (st, n)
+            val c' = renameCon st c
+        in
+            ([(DVal (x, n, c', renameExp st e), loc),
+              (DVal (x, n', c', (ENamed n, loc)), loc)],
+             st)
+        end
+      | DValRec vis =>
+        let
+            val d = (DValRec (map (fn (x, n, c, e) => (x, n, renameCon st c, renameExp st e)) vis), loc)
+
+            val (vis', st) = ListUtil.foldlMap (fn ((x, n, _, _), st) =>
+                                                   let
+                                                       val (st, n') = St.bind (st, n)
+                                                   in
+                                                       ((x, n, n'), st)
+                                                   end) st vis
+
+            val env = E.declBinds E.empty d
+        in
+            (d
+             :: map (fn (x, n, n') => (DVal (x, n', #2 (E.lookupENamed env n), (ENamed n, loc)), loc)) vis',
+             st)
+        end
+      | DSgn (x, n, sg) =>
+        let
+            val (st, n') = St.bind (st, n)
+        in
+            ([(DSgn (x, n, renameSgn st sg), loc),
+              (DSgn (x, n', (SgnVar n, loc)), loc)],
+             st)
+        end
+      | DStr (x, n, sg, str) =>
+        let
+            val (st, n') = St.bind (st, n)
+            val sg' = renameSgn st sg
+        in
+            ([(DStr (x, n, sg', renameStr st str), loc),
+              (DStr (x, n', sg', (StrVar n, loc)), loc)],
+             st)
+        end
+      | DFfiStr (x, n, sg) => ([(DFfiStr (x, n, renameSgn st sg), loc)], st)
+      | DExport (n, sg, str) =>
+        (case St.lookup (st, n) of
+             NONE => ([all], st)
+           | SOME n' => ([(DExport (n', renameSgn st sg, renameStr st str), loc)], st))
+      | DTable (n, x, m, c1, e1, c2, e2, c3) =>
+        let
+            val (st, m') = St.bind (st, m)
+
+            val d = (DTable (n, x, m, renameCon st c1, renameExp st e1, renameCon st c2,
+                             renameExp st e2, renameCon st c3), loc)
+
+            val env = E.declBinds E.empty d
+        in
+            ([d, (DVal (x, m', #2 (E.lookupENamed env m), (ENamed m, loc)), loc)], st)
+        end
+      | DSequence (n, x, m) =>
+        let
+            val (st, m') = St.bind (st, m)
+
+            val env = E.declBinds E.empty all
+        in
+            ([all, (DVal (x, m', #2 (E.lookupENamed env m), (ENamed m, loc)), loc)], st)
+        end
+      | DView (n, x, m, e, c) =>
+        let
+            val (st, m') = St.bind (st, m)
+
+            val d = (DView (n, x, m, renameExp st e, renameCon st c), loc)
+
+            val env = E.declBinds E.empty d
+        in
+            ([d, (DVal (x, m', #2 (E.lookupENamed env m), (ENamed m, loc)), loc)], st)
+        end
+      | DDatabase _ => ([all], st)
+      | DCookie (n, x, m, c) =>
+        let
+            val (st, m') = St.bind (st, m)
+
+            val d = (DCookie (n, x, m, renameCon st c), loc)
+
+            val env = E.declBinds E.empty d
+        in
+            ([d, (DVal (x, m', #2 (E.lookupENamed env m), (ENamed m, loc)), loc)], st)
+        end
+      | DStyle (n, x, m) =>
+        let
+            val (st, m') = St.bind (st, m)
+
+            val env = E.declBinds E.empty all
+        in
+            ([all, (DVal (x, m', #2 (E.lookupENamed env m), (ENamed m, loc)), loc)], st)
+        end
+      | DTask (e1, e2) => ([(DTask (renameExp st e1, renameExp st e2), loc)], st)
+      | DPolicy e => ([(DPolicy (renameExp st e), loc)], st)
+      | DOnError (n, xs, x) =>
+        (case St.lookup (st, n) of
+             NONE => ([all], st)
+           | SOME n' => ([(DOnError (n', xs, x), loc)], st))
+
+fun rename {NextId, FormalName, FormalId, Body = all as (str, loc)} =
+    case str of
+        StrConst ds =>
+        let
+            val st = St.create NextId
+            val (st, n) = St.bind (st, FormalId)
+                     
+            val (ds, st) = ListUtil.foldlMapConcat dupDecl st ds
+            val ds = (DStr (FormalName, n, (SgnConst [], loc), (StrVar FormalId, loc)), loc) :: ds
+        in
+            (St.next st, (StrConst ds, loc))
+        end
+      | _ => (NextId, all)
+
+end