adamc@26: (* Copyright (c) 2008, Adam Chlipala
adamc@26:  * All rights reserved.
adamc@26:  *
adamc@26:  * Redistribution and use in source and binary forms, with or without
adamc@26:  * modification, are permitted provided that the following conditions are met:
adamc@26:  *
adamc@26:  * - Redistributions of source code must retain the above copyright notice,
adamc@26:  *   this list of conditions and the following disclaimer.
adamc@26:  * - Redistributions in binary form must reproduce the above copyright notice,
adamc@26:  *   this list of conditions and the following disclaimer in the documentation
adamc@26:  *   and/or other materials provided with the distribution.
adamc@26:  * - The names of contributors may not be used to endorse or promote products
adamc@26:  *   derived from this software without specific prior written permission.
adamc@26:  *
adamc@26:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@26:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@26:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@26:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adamc@26:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@26:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@26:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@26:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@26:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@26:  * POSSIBILITY OF SUCH DAMAGE.
adamc@26:  *)
adamc@26: 
adamc@26: structure FlatUtil :> FLAT_UTIL = struct
adamc@26: 
adamc@26: open Flat
adamc@26: 
adamc@26: structure S = Search
adamc@26: 
adamc@26: structure Typ = struct
adamc@26: 
adamc@28: fun join (o1, o2) =
adamc@28:     case o1 of
adamc@28:         EQUAL => o2 ()
adamc@28:       | v => v
adamc@28: 
adamc@28: fun joinL f (os1, os2) =
adamc@28:     case (os1, os2) of
adamc@28:         (nil, nil) => EQUAL
adamc@28:       | (nil, _) => LESS
adamc@28:       | (h1 :: t1, h2 :: t2) =>
adamc@28:         join (f (h1, h2), fn () => joinL f (t1, t2))
adamc@28:       | (_ :: _, nil) => GREATER
adamc@28: 
adamc@28: fun compare ((t1, _), (t2, _)) =
adamc@28:     case (t1, t2) of
adamc@28:         (TFun (d1, r1), TFun (d2, r2)) =>
adamc@28:         join (compare (d1, d2), fn () => compare (r1, r2))
adamc@28:       | (TCode (d1, r1), TCode (d2, r2)) =>
adamc@28:         join (compare (d1, d2), fn () => compare (r1, r2))
adamc@28:       | (TRecord xts1, TRecord xts2) =>
adamc@28:         let
adamc@28:             val xts2 = sortFields xts1
adamc@28:             val xts2 = sortFields xts2
adamc@28:         in
adamc@28:             joinL compareFields (xts1, xts2)
adamc@28:         end
adamc@28:       | (TNamed n1, TNamed n2) => Int.compare (n1, n2)
adamc@28: 
adamc@28:       | (TFun _, _) => LESS
adamc@28:       | (_, TFun _) => GREATER
adamc@28: 
adamc@28:       | (TCode _, _) => LESS
adamc@28:       | (_, TCode _) => GREATER
adamc@28: 
adamc@28:       | (TRecord _, _) => LESS
adamc@28:       | (_, TRecord _) => GREATER
adamc@28: 
adamc@28: and compareFields ((x1, t1), (x2, t2)) =
adamc@28:     join (String.compare (x1, x2),
adamc@28:           fn () => compare (t1, t2))
adamc@28: 
adamc@28: and sortFields xts = ListMergeSort.sort (fn (x, y) => compareFields (x, y) = GREATER) xts
adamc@28: 
adamc@26: fun mapfold fc =
adamc@26:     let
adamc@26:         fun mft c acc =
adamc@26:             S.bindP (mft' c acc, fc)
adamc@26: 
adamc@26:         and mft' (cAll as (c, loc)) =
adamc@26:             case c of
adamc@26:                 TFun (t1, t2) =>
adamc@26:                 S.bind2 (mft t1,
adamc@26:                       fn t1' =>
adamc@26:                          S.map2 (mft t2,
adamc@26:                               fn t2' =>
adamc@26:                                  (TFun (t1', t2'), loc)))
adamc@26:               | TCode (t1, t2) =>
adamc@26:                 S.bind2 (mft t1,
adamc@26:                       fn t1' =>
adamc@26:                          S.map2 (mft t2,
adamc@26:                               fn t2' =>
adamc@26:                                  (TCode (t1', t2'), loc)))
adamc@26:               | TRecord xts =>
adamc@26:                 S.map2 (ListUtil.mapfold (fn (x, t) =>
adamc@26:                                              S.map2 (mft t,
adamc@26:                                                   fn t' =>
adamc@26:                                                      (x, t')))
adamc@26:                                          xts,
adamc@26:                      fn xts' => (TRecord xts', loc))
adamc@26:               | TNamed _ => S.return2 cAll
adamc@26:     in
adamc@26:         mft
adamc@26:     end
adamc@26: 
adamc@26: fun map typ c =
adamc@26:     case mapfold (fn c => fn () => S.Continue (typ c, ())) c () of
adamc@26:         S.Return () => raise Fail "Flat_util.Typ.map"
adamc@26:       | S.Continue (c, ()) => c
adamc@26: 
adamc@26: fun fold typ s c =
adamc@26:     case mapfold (fn c => fn s => S.Continue (c, typ (c, s))) c s of
adamc@26:         S.Continue (_, s) => s
adamc@26:       | S.Return _ => raise Fail "FlatUtil.Typ.fold: Impossible"
adamc@26: 
adamc@26: fun exists typ k =
adamc@26:     case mapfold (fn c => fn () =>
adamc@26:                              if typ c then
adamc@26:                                  S.Return ()
adamc@26:                              else
adamc@26:                                  S.Continue (c, ())) k () of
adamc@26:         S.Return _ => true
adamc@26:       | S.Continue _ => false
adamc@26: 
adamc@26: end
adamc@26: 
adamc@26: structure Exp = struct
adamc@26: 
adamc@26: datatype binder =
adamc@26:          NamedT of string * int * typ option
adamc@26:        | RelE of string * typ
adamc@26:        | NamedE of string * int * typ * exp option
adamc@26: 
adamc@26: fun mapfoldB {typ = fc, exp = fe, bind} =
adamc@26:     let
adamc@26:         val mft = Typ.mapfold fc
adamc@26: 
adamc@26:         fun mfe ctx e acc =
adamc@26:             S.bindP (mfe' ctx e acc, fe ctx)
adamc@26: 
adamc@26:         and mfe' ctx (eAll as (e, loc)) =
adamc@26:             case e of
adamc@26:                 EPrim _ => S.return2 eAll
adamc@26:               | ERel _ => S.return2 eAll
adamc@26:               | ENamed _ => S.return2 eAll
adamc@26:               | ECode _ => S.return2 eAll
adamc@26:               | EApp (e1, e2) =>
adamc@26:                 S.bind2 (mfe ctx e1,
adamc@26:                      fn e1' =>
adamc@26:                         S.map2 (mfe ctx e2,
adamc@26:                              fn e2' =>
adamc@26:                                 (EApp (e1', e2'), loc)))
adamc@26: 
adamc@26:               | ERecord xes =>
adamc@26:                 S.map2 (ListUtil.mapfold (fn (x, e) =>
adamc@26:                                              S.map2 (mfe ctx e,
adamc@26:                                                   fn e' =>
adamc@26:                                                      (x, e')))
adamc@26:                                          xes,
adamc@26:                      fn xes' =>
adamc@26:                         (ERecord xes', loc))
adamc@26:               | EField (e, x) =>
adamc@26:                 S.map2 (mfe ctx e,
adamc@26:                       fn e' =>
adamc@26:                          (EField (e', x), loc))
adamc@26: 
adamc@26:               | ELet (xes, e) =>
adamc@26:                 S.bind2 (ListUtil.mapfold (fn (x, e) =>
adamc@26:                                               S.map2 (mfe ctx e,
adamc@26:                                                    fn e' =>
adamc@26:                                                       (x, e')))
adamc@26:                                           xes,
adamc@26:                       fn xes' =>
adamc@26:                          S.map2 (mfe ctx e,
adamc@26:                                  fn e' =>
adamc@26:                                     (ELet (xes', e'), loc)))
adamc@26:     in
adamc@26:         mfe
adamc@26:     end
adamc@26: 
adamc@26: fun mapfold {typ = fc, exp = fe} =
adamc@26:     mapfoldB {typ = fc,
adamc@26:               exp = fn () => fe,
adamc@26:               bind = fn ((), _) => ()} ()
adamc@26: 
adamc@26: fun mapB {typ, exp, bind} ctx e =
adamc@26:     case mapfoldB {typ = fn c => fn () => S.Continue (typ c, ()),
adamc@26:                    exp = fn ctx => fn e => fn () => S.Continue (exp ctx e, ()),
adamc@26:                    bind = bind} ctx e () of
adamc@26:         S.Continue (e, ()) => e
adamc@26:       | S.Return _ => raise Fail "FlatUtil.Exp.mapB: Impossible"
adamc@26: 
adamc@26: fun map {typ, exp} e =
adamc@26:     case mapfold {typ = fn c => fn () => S.Continue (typ c, ()),
adamc@26:                   exp = fn e => fn () => S.Continue (exp e, ())} e () of
adamc@26:         S.Return () => raise Fail "Flat_util.Exp.map"
adamc@26:       | S.Continue (e, ()) => e
adamc@26: 
adamc@26: fun fold {typ, exp} s e =
adamc@26:     case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
adamc@26:                   exp = fn e => fn s => S.Continue (e, exp (e, s))} e s of
adamc@26:         S.Continue (_, s) => s
adamc@26:       | S.Return _ => raise Fail "FlatUtil.Exp.fold: Impossible"
adamc@26: 
adamc@26: fun exists {typ, exp} k =
adamc@26:     case mapfold {typ = fn c => fn () =>
adamc@26:                                     if typ c then
adamc@26:                                         S.Return ()
adamc@26:                                     else
adamc@26:                                         S.Continue (c, ()),
adamc@26:                   exp = fn e => fn () =>
adamc@26:                                     if exp e then
adamc@26:                                         S.Return ()
adamc@26:                                     else
adamc@26:                                         S.Continue (e, ())} k () of
adamc@26:         S.Return _ => true
adamc@26:       | S.Continue _ => false
adamc@26: 
adamc@26: end
adamc@26: 
adamc@26: structure Decl = struct
adamc@26: 
adamc@26: datatype binder = datatype Exp.binder
adamc@26: 
adamc@26: fun mapfoldB {typ = fc, exp = fe, decl = fd, bind} =
adamc@26:     let
adamc@26:         val mft = Typ.mapfold fc
adamc@26: 
adamc@26:         val mfe = Exp.mapfoldB {typ = fc, exp = fe, bind = bind}
adamc@26: 
adamc@26:         fun mfd ctx d acc =
adamc@26:             S.bindP (mfd' ctx d acc, fd ctx)
adamc@26: 
adamc@26:         and mfd' ctx (dAll as (d, loc)) =
adamc@26:             case d of
adamc@26:                 DVal (x, n, t, e) =>
adamc@26:                 S.bind2 (mft t,
adamc@26:                       fn t' =>
adamc@26:                          S.map2 (mfe ctx e,
adamc@26:                               fn e' =>
adamc@26:                                  (DVal (x, n, t', e'), loc)))
adamc@26:               | DFun (n, x, dom, ran, e) =>
adamc@26:                 S.bind2 (mft dom,
adamc@26:                       fn dom' =>
adamc@26:                          S.bind2 (mft ran,
adamc@26:                                fn ran' =>
adamc@26:                                   S.map2 (mfe ctx e,
adamc@26:                                        fn e' =>
adamc@26:                                           (DFun (n, x, dom', ran', e'), loc))))
adamc@26:     in
adamc@26:         mfd
adamc@26:     end    
adamc@26: 
adamc@26: fun mapfold {typ = fc, exp = fe, decl = fd} =
adamc@26:     mapfoldB {typ = fc,
adamc@26:               exp = fn () => fe,
adamc@26:               decl = fn () => fd,
adamc@26:               bind = fn ((), _) => ()} ()
adamc@26: 
adamc@26: fun fold {typ, exp, decl} s d =
adamc@26:     case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
adamc@26:                   exp = fn e => fn s => S.Continue (e, exp (e, s)),
adamc@26:                   decl = fn d => fn s => S.Continue (d, decl (d, s))} d s of
adamc@26:         S.Continue (_, s) => s
adamc@26:       | S.Return _ => raise Fail "FlatUtil.Decl.fold: Impossible"
adamc@26: 
adamc@26: end
adamc@26: 
adamc@26: structure File = struct
adamc@26: 
adamc@26: datatype binder =
adamc@26:          NamedT of string * int * typ option
adamc@26:        | RelE of string * typ
adamc@26:        | NamedE of string * int * typ * exp option
adamc@26:        | F of int * string * Flat.typ * Flat.typ * Flat.exp
adamc@26: 
adamc@26: fun mapfoldB (all as {bind, ...}) =
adamc@26:     let
adamc@26:         val mfd = Decl.mapfoldB all
adamc@26: 
adamc@26:         fun mff ctx ds =
adamc@26:             case ds of
adamc@26:                 nil => S.return2 nil
adamc@26:               | d :: ds' =>
adamc@26:                 S.bind2 (mfd ctx d,
adamc@26:                          fn d' =>
adamc@26:                             let
adamc@26:                                 val b =
adamc@26:                                     case #1 d' of
adamc@26:                                         DVal (x, n, t, e) => NamedE (x, n, t, SOME e)
adamc@26:                                       | DFun v => F v
adamc@26:                                 val ctx' = bind (ctx, b)
adamc@26:                             in
adamc@26:                                 S.map2 (mff ctx' ds',
adamc@26:                                      fn ds' =>
adamc@26:                                         d' :: ds')
adamc@26:                             end)
adamc@26:     in
adamc@26:         mff
adamc@26:     end
adamc@26: 
adamc@26: fun mapfold {typ = fc, exp = fe, decl = fd} =
adamc@26:     mapfoldB {typ = fc,
adamc@26:               exp = fn () => fe,
adamc@26:               decl = fn () => fd,
adamc@26:               bind = fn ((), _) => ()} ()
adamc@26: 
adamc@26: fun mapB {typ, exp, decl, bind} ctx ds =
adamc@26:     case mapfoldB {typ = fn c => fn () => S.Continue (typ c, ()),
adamc@26:                    exp = fn ctx => fn e => fn () => S.Continue (exp ctx e, ()),
adamc@26:                    decl = fn ctx => fn d => fn () => S.Continue (decl ctx d, ()),
adamc@26:                    bind = bind} ctx ds () of
adamc@26:         S.Continue (ds, ()) => ds
adamc@26:       | S.Return _ => raise Fail "FlatUtil.File.mapB: Impossible"
adamc@26: 
adamc@26: fun fold {typ, exp, decl} s d =
adamc@26:     case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
adamc@26:                   exp = fn e => fn s => S.Continue (e, exp (e, s)),
adamc@26:                   decl = fn d => fn s => S.Continue (d, decl (d, s))} d s of
adamc@26:         S.Continue (_, s) => s
adamc@26:       | S.Return _ => raise Fail "FlatUtil.File.fold: Impossible"
adamc@26: 
adamc@26: end
adamc@26: 
adamc@26: end