adamc@16: (* Copyright (c) 2008, Adam Chlipala
adamc@16:  * All rights reserved.
adamc@16:  *
adamc@16:  * Redistribution and use in source and binary forms, with or without
adamc@16:  * modification, are permitted provided that the following conditions are met:
adamc@16:  *
adamc@16:  * - Redistributions of source code must retain the above copyright notice,
adamc@16:  *   this list of conditions and the following disclaimer.
adamc@16:  * - Redistributions in binary form must reproduce the above copyright notice,
adamc@16:  *   this list of conditions and the following disclaimer in the documentation
adamc@16:  *   and/or other materials provided with the distribution.
adamc@16:  * - The names of contributors may not be used to endorse or promote products
adamc@16:  *   derived from this software without specific prior written permission.
adamc@16:  *
adamc@16:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@16:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@16:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@16:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@16:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adamc@16:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@16:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@16:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@16:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@16:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@16:  * POSSIBILITY OF SUCH DAMAGE.
adamc@16:  *)
adamc@16: 
adamc@16: structure CoreUtil :> CORE_UTIL = struct
adamc@16: 
adamc@16: open Core
adamc@16: 
adamc@16: structure S = Search
adamc@16: 
adamc@16: structure Kind = struct
adamc@16: 
adamc@16: fun mapfold f =
adamc@16:     let
adamc@16:         fun mfk k acc =
adamc@16:             S.bindP (mfk' k acc, f)
adamc@16: 
adamc@16:         and mfk' (kAll as (k, loc)) =
adamc@16:             case k of
adamc@16:                 KType => S.return2 kAll
adamc@16: 
adamc@16:               | KArrow (k1, k2) =>
adamc@16:                 S.bind2 (mfk k1,
adamc@16:                       fn k1' =>
adamc@16:                          S.map2 (mfk k2,
adamc@16:                               fn k2' =>
adamc@16:                                  (KArrow (k1', k2'), loc)))
adamc@16: 
adamc@16:               | KName => S.return2 kAll
adamc@16: 
adamc@16:               | KRecord k =>
adamc@16:                 S.map2 (mfk k,
adamc@16:                         fn k' =>
adamc@16:                            (KRecord k', loc))
adamc@16:     in
adamc@16:         mfk
adamc@16:     end
adamc@16: 
adamc@16: fun map f k =
adamc@16:     case mapfold (fn k => fn () => S.Continue (f k, ())) k () of
adamc@16:         S.Return () => raise Fail "Core_util.Kind.map"
adamc@16:       | S.Continue (k, ()) => k
adamc@16: 
adamc@16: fun exists f k =
adamc@16:     case mapfold (fn k => fn () =>
adamc@16:                              if f k then
adamc@16:                                  S.Return ()
adamc@16:                              else
adamc@16:                                  S.Continue (k, ())) k () of
adamc@16:         S.Return _ => true
adamc@16:       | S.Continue _ => false
adamc@16: 
adamc@16: end
adamc@16: 
adamc@16: structure Con = struct
adamc@16: 
adamc@16: datatype binder =
adamc@16:          Rel of string * kind
adamc@20:        | Named of string * int * kind * con option
adamc@16: 
adamc@16: fun mapfoldB {kind = fk, con = fc, bind} =
adamc@16:     let
adamc@16:         val mfk = Kind.mapfold fk
adamc@16: 
adamc@16:         fun mfc ctx c acc =
adamc@16:             S.bindP (mfc' ctx c acc, fc ctx)
adamc@16: 
adamc@16:         and mfc' ctx (cAll as (c, loc)) =
adamc@16:             case c of
adamc@16:                 TFun (c1, c2) =>
adamc@16:                 S.bind2 (mfc ctx c1,
adamc@16:                       fn c1' =>
adamc@16:                          S.map2 (mfc ctx c2,
adamc@16:                               fn c2' =>
adamc@16:                                  (TFun (c1', c2'), loc)))
adamc@16:               | TCFun (x, k, c) =>
adamc@16:                 S.bind2 (mfk k,
adamc@16:                       fn k' =>
adamc@16:                          S.map2 (mfc (bind (ctx, Rel (x, k))) c,
adamc@16:                               fn c' =>
adamc@16:                                  (TCFun (x, k', c'), loc)))
adamc@16:               | TRecord c =>
adamc@16:                 S.map2 (mfc ctx c,
adamc@16:                         fn c' =>
adamc@16:                            (TRecord c', loc))
adamc@16: 
adamc@16:               | CRel _ => S.return2 cAll
adamc@16:               | CNamed _ => S.return2 cAll
adamc@48:               | CFfi _ => S.return2 cAll
adamc@16:               | CApp (c1, c2) =>
adamc@16:                 S.bind2 (mfc ctx c1,
adamc@16:                       fn c1' =>
adamc@16:                          S.map2 (mfc ctx c2,
adamc@16:                               fn c2' =>
adamc@16:                                  (CApp (c1', c2'), loc)))
adamc@16:               | CAbs (x, k, c) =>
adamc@16:                 S.bind2 (mfk k,
adamc@16:                       fn k' =>
adamc@16:                          S.map2 (mfc (bind (ctx, Rel (x, k))) c,
adamc@16:                               fn c' =>
adamc@16:                                  (CAbs (x, k', c'), loc)))
adamc@16: 
adamc@16:               | CName _ => S.return2 cAll
adamc@16: 
adamc@16:               | CRecord (k, xcs) =>
adamc@16:                 S.bind2 (mfk k,
adamc@16:                       fn k' =>
adamc@16:                          S.map2 (ListUtil.mapfold (fn (x, c) =>
adamc@16:                                                       S.bind2 (mfc ctx x,
adamc@16:                                                             fn x' =>
adamc@16:                                                                S.map2 (mfc ctx c,
adamc@16:                                                                     fn c' =>
adamc@16:                                                                        (x', c'))))
adamc@16:                                  xcs,
adamc@16:                               fn xcs' =>
adamc@16:                                  (CRecord (k', xcs'), loc)))
adamc@16:               | CConcat (c1, c2) =>
adamc@16:                 S.bind2 (mfc ctx c1,
adamc@16:                       fn c1' =>
adamc@16:                          S.map2 (mfc ctx c2,
adamc@16:                               fn c2' =>
adamc@16:                                  (CConcat (c1', c2'), loc)))
adamc@16:     in
adamc@16:         mfc
adamc@16:     end
adamc@16: 
adamc@16: fun mapfold {kind = fk, con = fc} =
adamc@16:     mapfoldB {kind = fk,
adamc@16:               con = fn () => fc,
adamc@16:               bind = fn ((), _) => ()} ()
adamc@16: 
adamc@16: fun map {kind, con} c =
adamc@16:     case mapfold {kind = fn k => fn () => S.Continue (kind k, ()),
adamc@16:                   con = fn c => fn () => S.Continue (con c, ())} c () of
adamc@16:         S.Return () => raise Fail "Core_util.Con.map"
adamc@16:       | S.Continue (c, ()) => c
adamc@16: 
adamc@16: fun mapB {kind, con, bind} ctx c =
adamc@16:     case mapfoldB {kind = fn k => fn () => S.Continue (kind k, ()),
adamc@16:                    con = fn ctx => fn c => fn () => S.Continue (con ctx c, ()),
adamc@16:                    bind = bind} ctx c () of
adamc@16:         S.Continue (c, ()) => c
adamc@20:       | S.Return _ => raise Fail "CoreUtil.Con.mapB: Impossible"
adamc@16: 
adamc@23: fun fold {kind, con} s c =
adamc@23:     case mapfold {kind = fn k => fn s => S.Continue (k, kind (k, s)),
adamc@23:                   con = fn c => fn s => S.Continue (c, con (c, s))} c s of
adamc@23:         S.Continue (_, s) => s
adamc@23:       | S.Return _ => raise Fail "CoreUtil.Con.fold: Impossible"
adamc@23: 
adamc@16: fun exists {kind, con} k =
adamc@16:     case mapfold {kind = fn k => fn () =>
adamc@16:                                     if kind k then
adamc@16:                                         S.Return ()
adamc@16:                                     else
adamc@16:                                         S.Continue (k, ()),
adamc@16:                   con = fn c => fn () =>
adamc@16:                                     if con c then
adamc@16:                                         S.Return ()
adamc@16:                                     else
adamc@16:                                         S.Continue (c, ())} k () of
adamc@16:         S.Return _ => true
adamc@16:       | S.Continue _ => false
adamc@16: 
adamc@16: end
adamc@16: 
adamc@16: structure Exp = struct
adamc@16: 
adamc@16: datatype binder =
adamc@16:          RelC of string * kind
adamc@20:        | NamedC of string * int * kind * con option
adamc@16:        | RelE of string * con
adamc@20:        | NamedE of string * int * con * exp option
adamc@16: 
adamc@16: fun mapfoldB {kind = fk, con = fc, exp = fe, bind} =
adamc@16:     let
adamc@16:         val mfk = Kind.mapfold fk
adamc@16: 
adamc@16:         fun bind' (ctx, b) =
adamc@16:             let
adamc@16:                 val b' = case b of
adamc@16:                              Con.Rel x => RelC x
adamc@16:                            | Con.Named x => NamedC x
adamc@16:             in
adamc@16:                 bind (ctx, b')
adamc@16:             end
adamc@16:         val mfc = Con.mapfoldB {kind = fk, con = fc, bind = bind'}
adamc@16: 
adamc@16:         fun mfe ctx e acc =
adamc@16:             S.bindP (mfe' ctx e acc, fe ctx)
adamc@16: 
adamc@16:         and mfe' ctx (eAll as (e, loc)) =
adamc@16:             case e of
adamc@16:                 EPrim _ => S.return2 eAll
adamc@16:               | ERel _ => S.return2 eAll
adamc@16:               | ENamed _ => S.return2 eAll
adamc@48:               | EFfi _ => S.return2 eAll
adamc@48:               | EFfiApp (m, x, es) =>
adamc@48:                 S.map2 (ListUtil.mapfold (fn e => mfe ctx e) es,
adamc@48:                      fn es' =>
adamc@48:                         (EFfiApp (m, x, es'), loc))
adamc@16:               | EApp (e1, e2) =>
adamc@16:                 S.bind2 (mfe ctx e1,
adamc@16:                       fn e1' =>
adamc@16:                          S.map2 (mfe ctx e2,
adamc@16:                               fn e2' =>
adamc@16:                                  (EApp (e1', e2'), loc)))
adamc@26:               | EAbs (x, dom, ran, e) =>
adamc@26:                 S.bind2 (mfc ctx dom,
adamc@26:                       fn dom' =>
adamc@26:                          S.bind2 (mfc ctx ran,
adamc@26:                                fn ran' =>
adamc@26:                                   S.map2 (mfe (bind (ctx, RelE (x, dom'))) e,
adamc@26:                                        fn e' =>
adamc@26:                                           (EAbs (x, dom', ran', e'), loc))))
adamc@16: 
adamc@16:               | ECApp (e, c) =>
adamc@16:                 S.bind2 (mfe ctx e,
adamc@16:                       fn e' =>
adamc@16:                          S.map2 (mfc ctx c,
adamc@16:                               fn c' =>
adamc@16:                                  (ECApp (e', c'), loc)))
adamc@16:               | ECAbs (x, k, e) =>
adamc@16:                 S.bind2 (mfk k,
adamc@16:                       fn k' =>
adamc@16:                          S.map2 (mfe (bind (ctx, RelC (x, k))) e,
adamc@16:                               fn e' =>
adamc@16:                                  (ECAbs (x, k', e'), loc)))
adamc@16: 
adamc@16:               | ERecord xes =>
adamc@29:                 S.map2 (ListUtil.mapfold (fn (x, e, t) =>
adamc@16:                                              S.bind2 (mfc ctx x,
adamc@16:                                                    fn x' =>
adamc@29:                                                       S.bind2 (mfe ctx e,
adamc@29:                                                             fn e' =>
adamc@29:                                                                S.map2 (mfc ctx t,
adamc@29:                                                                     fn t' =>
adamc@29:                                                                        (x', e', t')))))
adamc@16:                                          xes,
adamc@16:                      fn xes' =>
adamc@16:                         (ERecord xes', loc))
adamc@16:               | EField (e, c, {field, rest}) =>
adamc@16:                 S.bind2 (mfe ctx e,
adamc@16:                       fn e' =>
adamc@16:                          S.bind2 (mfc ctx c,
adamc@16:                               fn c' =>
adamc@16:                                  S.bind2 (mfc ctx field,
adamc@16:                                           fn field' =>
adamc@16:                                              S.map2 (mfc ctx rest,
adamc@16:                                                   fn rest' =>
adamc@16:                                                      (EField (e', c', {field = field', rest = rest'}), loc)))))
adamc@16:     in
adamc@16:         mfe
adamc@16:     end
adamc@16: 
adamc@16: fun mapfold {kind = fk, con = fc, exp = fe} =
adamc@16:     mapfoldB {kind = fk,
adamc@16:               con = fn () => fc,
adamc@16:               exp = fn () => fe,
adamc@16:               bind = fn ((), _) => ()} ()
adamc@16: 
adamc@21: fun mapB {kind, con, exp, bind} ctx e =
adamc@21:     case mapfoldB {kind = fn k => fn () => S.Continue (kind k, ()),
adamc@21:                    con = fn ctx => fn c => fn () => S.Continue (con ctx c, ()),
adamc@21:                    exp = fn ctx => fn e => fn () => S.Continue (exp ctx e, ()),
adamc@21:                    bind = bind} ctx e () of
adamc@21:         S.Continue (e, ()) => e
adamc@21:       | S.Return _ => raise Fail "CoreUtil.Exp.mapB: Impossible"
adamc@21: 
adamc@16: fun map {kind, con, exp} e =
adamc@16:     case mapfold {kind = fn k => fn () => S.Continue (kind k, ()),
adamc@16:                   con = fn c => fn () => S.Continue (con c, ()),
adamc@16:                   exp = fn e => fn () => S.Continue (exp e, ())} e () of
adamc@16:         S.Return () => raise Fail "Core_util.Exp.map"
adamc@16:       | S.Continue (e, ()) => e
adamc@16: 
adamc@23: fun fold {kind, con, exp} s e =
adamc@23:     case mapfold {kind = fn k => fn s => S.Continue (k, kind (k, s)),
adamc@23:                   con = fn c => fn s => S.Continue (c, con (c, s)),
adamc@23:                   exp = fn e => fn s => S.Continue (e, exp (e, s))} e s of
adamc@23:         S.Continue (_, s) => s
adamc@23:       | S.Return _ => raise Fail "CoreUtil.Exp.fold: Impossible"
adamc@23: 
adamc@16: fun exists {kind, con, exp} k =
adamc@16:     case mapfold {kind = fn k => fn () =>
adamc@16:                                     if kind k then
adamc@16:                                         S.Return ()
adamc@16:                                     else
adamc@16:                                         S.Continue (k, ()),
adamc@16:                   con = fn c => fn () =>
adamc@16:                                     if con c then
adamc@16:                                         S.Return ()
adamc@16:                                     else
adamc@16:                                         S.Continue (c, ()),
adamc@16:                   exp = fn e => fn () =>
adamc@16:                                     if exp e then
adamc@16:                                         S.Return ()
adamc@16:                                     else
adamc@16:                                         S.Continue (e, ())} k () of
adamc@16:         S.Return _ => true
adamc@16:       | S.Continue _ => false
adamc@16: 
adamc@16: end
adamc@16: 
adamc@20: structure Decl = struct
adamc@20: 
adamc@20: datatype binder = datatype Exp.binder
adamc@20: 
adamc@20: fun mapfoldB {kind = fk, con = fc, exp = fe, decl = fd, bind} =
adamc@20:     let
adamc@20:         val mfk = Kind.mapfold fk
adamc@20: 
adamc@20:         fun bind' (ctx, b) =
adamc@20:             let
adamc@20:                 val b' = case b of
adamc@20:                              Con.Rel x => RelC x
adamc@20:                            | Con.Named x => NamedC x
adamc@20:             in
adamc@20:                 bind (ctx, b')
adamc@20:             end
adamc@20:         val mfc = Con.mapfoldB {kind = fk, con = fc, bind = bind'}
adamc@20: 
adamc@20:         val mfe = Exp.mapfoldB {kind = fk, con = fc, exp = fe, bind = bind}
adamc@20: 
adamc@20:         fun mfd ctx d acc =
adamc@20:             S.bindP (mfd' ctx d acc, fd ctx)
adamc@20: 
adamc@20:         and mfd' ctx (dAll as (d, loc)) =
adamc@20:             case d of
adamc@20:                 DCon (x, n, k, c) =>
adamc@20:                 S.bind2 (mfk k,
adamc@20:                       fn k' =>
adamc@20:                          S.map2 (mfc ctx c,
adamc@20:                               fn c' =>
adamc@20:                                  (DCon (x, n, k', c'), loc)))
adamc@20:               | DVal (x, n, t, e) =>
adamc@20:                 S.bind2 (mfc ctx t,
adamc@20:                       fn t' =>
adamc@20:                          S.map2 (mfe ctx e,
adamc@20:                               fn e' =>
adamc@20:                                  (DVal (x, n, t', e'), loc)))
adamc@20:     in
adamc@20:         mfd
adamc@20:     end    
adamc@20: 
adamc@23: fun mapfold {kind = fk, con = fc, exp = fe, decl = fd} =
adamc@23:     mapfoldB {kind = fk,
adamc@23:               con = fn () => fc,
adamc@23:               exp = fn () => fe,
adamc@23:               decl = fn () => fd,
adamc@23:               bind = fn ((), _) => ()} ()
adamc@23: 
adamc@23: fun fold {kind, con, exp, decl} s d =
adamc@23:     case mapfold {kind = fn k => fn s => S.Continue (k, kind (k, s)),
adamc@23:                   con = fn c => fn s => S.Continue (c, con (c, s)),
adamc@23:                   exp = fn e => fn s => S.Continue (e, exp (e, s)),
adamc@23:                   decl = fn d => fn s => S.Continue (d, decl (d, s))} d s of
adamc@23:         S.Continue (_, s) => s
adamc@23:       | S.Return _ => raise Fail "CoreUtil.Decl.fold: Impossible"
adamc@23: 
adamc@16: end
adamc@20: 
adamc@20: structure File = struct
adamc@20: 
adamc@20: datatype binder = datatype Exp.binder
adamc@20: 
adamc@20: fun mapfoldB (all as {bind, ...}) =
adamc@20:     let
adamc@20:         val mfd = Decl.mapfoldB all
adamc@20: 
adamc@20:         fun mff ctx ds =
adamc@20:             case ds of
adamc@20:                 nil => S.return2 nil
adamc@20:               | d :: ds' =>
adamc@20:                 S.bind2 (mfd ctx d,
adamc@20:                          fn d' =>
adamc@20:                             let
adamc@20:                                 val b =
adamc@20:                                     case #1 d' of
adamc@20:                                         DCon (x, n, k, c) => NamedC (x, n, k, SOME c)
adamc@20:                                       | DVal (x, n, t, e) => NamedE (x, n, t, SOME e)
adamc@20:                                 val ctx' = bind (ctx, b)
adamc@20:                             in
adamc@20:                                 S.map2 (mff ctx' ds',
adamc@20:                                      fn ds' =>
adamc@20:                                         d' :: ds')
adamc@20:                             end)
adamc@20:     in
adamc@20:         mff
adamc@20:     end
adamc@20: 
adamc@23: fun mapfold {kind = fk, con = fc, exp = fe, decl = fd} =
adamc@23:     mapfoldB {kind = fk,
adamc@23:               con = fn () => fc,
adamc@23:               exp = fn () => fe,
adamc@23:               decl = fn () => fd,
adamc@23:               bind = fn ((), _) => ()} ()
adamc@23: 
adamc@20: fun mapB {kind, con, exp, decl, bind} ctx ds =
adamc@20:     case mapfoldB {kind = fn k => fn () => S.Continue (kind k, ()),
adamc@20:                    con = fn ctx => fn c => fn () => S.Continue (con ctx c, ()),
adamc@20:                    exp = fn ctx => fn e => fn () => S.Continue (exp ctx e, ()),
adamc@20:                    decl = fn ctx => fn d => fn () => S.Continue (decl ctx d, ()),
adamc@20:                    bind = bind} ctx ds () of
adamc@20:         S.Continue (ds, ()) => ds
adamc@20:       | S.Return _ => raise Fail "CoreUtil.File.mapB: Impossible"
adamc@20: 
adamc@23: fun fold {kind, con, exp, decl} s d =
adamc@23:     case mapfold {kind = fn k => fn s => S.Continue (k, kind (k, s)),
adamc@23:                   con = fn c => fn s => S.Continue (c, con (c, s)),
adamc@23:                   exp = fn e => fn s => S.Continue (e, exp (e, s)),
adamc@23:                   decl = fn d => fn s => S.Continue (d, decl (d, s))} d s of
adamc@23:         S.Continue (_, s) => s
adamc@23:       | S.Return _ => raise Fail "CoreUtil.File.fold: Impossible"
adamc@23: 
adamc@20: end
adamc@20: 
adamc@20: end