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|
(* 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 FlatUtil :> FLAT_UTIL = struct
open Flat
structure S = Search
structure Typ = struct
fun join (o1, o2) =
case o1 of
EQUAL => o2 ()
| v => v
fun joinL f (os1, os2) =
case (os1, os2) of
(nil, nil) => EQUAL
| (nil, _) => LESS
| (h1 :: t1, h2 :: t2) =>
join (f (h1, h2), fn () => joinL f (t1, t2))
| (_ :: _, nil) => GREATER
fun compare ((t1, _), (t2, _)) =
case (t1, t2) of
(TTop, TTop) => EQUAL
| (TFun (d1, r1), TFun (d2, r2)) =>
join (compare (d1, d2), fn () => compare (r1, r2))
| (TCode (d1, r1), TCode (d2, r2)) =>
join (compare (d1, d2), fn () => compare (r1, r2))
| (TRecord xts1, TRecord xts2) =>
let
val xts2 = sortFields xts1
val xts2 = sortFields xts2
in
joinL compareFields (xts1, xts2)
end
| (TNamed n1, TNamed n2) => Int.compare (n1, n2)
| (TTop, _) => LESS
| (_, TTop) => GREATER
| (TFun _, _) => LESS
| (_, TFun _) => GREATER
| (TCode _, _) => LESS
| (_, TCode _) => GREATER
| (TRecord _, _) => LESS
| (_, TRecord _) => GREATER
and compareFields ((x1, t1), (x2, t2)) =
join (String.compare (x1, x2),
fn () => compare (t1, t2))
and sortFields xts = ListMergeSort.sort (fn (x, y) => compareFields (x, y) = GREATER) xts
fun mapfold fc =
let
fun mft c acc =
S.bindP (mft' c acc, fc)
and mft' (cAll as (c, loc)) =
case c of
TTop => S.return2 cAll
| TFun (t1, t2) =>
S.bind2 (mft t1,
fn t1' =>
S.map2 (mft t2,
fn t2' =>
(TFun (t1', t2'), loc)))
| TCode (t1, t2) =>
S.bind2 (mft t1,
fn t1' =>
S.map2 (mft t2,
fn t2' =>
(TCode (t1', t2'), loc)))
| TRecord xts =>
S.map2 (ListUtil.mapfold (fn (x, t) =>
S.map2 (mft t,
fn t' =>
(x, t')))
xts,
fn xts' => (TRecord xts', loc))
| TNamed _ => S.return2 cAll
in
mft
end
fun map typ c =
case mapfold (fn c => fn () => S.Continue (typ c, ())) c () of
S.Return () => raise Fail "Flat_util.Typ.map"
| S.Continue (c, ()) => c
fun fold typ s c =
case mapfold (fn c => fn s => S.Continue (c, typ (c, s))) c s of
S.Continue (_, s) => s
| S.Return _ => raise Fail "FlatUtil.Typ.fold: Impossible"
fun exists typ k =
case mapfold (fn c => fn () =>
if typ c then
S.Return ()
else
S.Continue (c, ())) k () of
S.Return _ => true
| S.Continue _ => false
end
structure Exp = struct
datatype binder =
NamedT of string * int * typ option
| RelE of string * typ
| NamedE of string * int * typ * exp option
fun mapfoldB {typ = fc, exp = fe, bind} =
let
val mft = Typ.mapfold fc
fun mfe ctx e acc =
S.bindP (mfe' ctx e acc, fe ctx)
and mfe' ctx (eAll as (e, loc)) =
case e of
EPrim _ => S.return2 eAll
| ERel _ => S.return2 eAll
| ENamed _ => S.return2 eAll
| ECode _ => S.return2 eAll
| EApp (e1, e2) =>
S.bind2 (mfe ctx e1,
fn e1' =>
S.map2 (mfe ctx e2,
fn e2' =>
(EApp (e1', e2'), loc)))
| ERecord xes =>
S.map2 (ListUtil.mapfold (fn (x, e, t) =>
S.bind2 (mfe ctx e,
fn e' =>
S.map2 (mft t,
fn t' =>
(x, e', t'))))
xes,
fn xes' =>
(ERecord xes', loc))
| EField (e, x) =>
S.map2 (mfe ctx e,
fn e' =>
(EField (e', x), loc))
| ELet (xes, e) =>
S.bind2 (ListUtil.mapfold (fn (x, t, e) =>
S.bind2 (mft t,
fn t' =>
S.map2 (mfe ctx e,
fn e' =>
(x, t', e'))))
xes,
fn xes' =>
S.map2 (mfe ctx e,
fn e' =>
(ELet (xes', e'), loc)))
in
mfe
end
fun mapfold {typ = fc, exp = fe} =
mapfoldB {typ = fc,
exp = fn () => fe,
bind = fn ((), _) => ()} ()
fun mapB {typ, exp, bind} ctx e =
case mapfoldB {typ = fn c => fn () => S.Continue (typ c, ()),
exp = fn ctx => fn e => fn () => S.Continue (exp ctx e, ()),
bind = bind} ctx e () of
S.Continue (e, ()) => e
| S.Return _ => raise Fail "FlatUtil.Exp.mapB: Impossible"
fun map {typ, exp} e =
case mapfold {typ = fn c => fn () => S.Continue (typ c, ()),
exp = fn e => fn () => S.Continue (exp e, ())} e () of
S.Return () => raise Fail "Flat_util.Exp.map"
| S.Continue (e, ()) => e
fun fold {typ, exp} s e =
case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
exp = fn e => fn s => S.Continue (e, exp (e, s))} e s of
S.Continue (_, s) => s
| S.Return _ => raise Fail "FlatUtil.Exp.fold: Impossible"
fun exists {typ, exp} k =
case mapfold {typ = fn c => fn () =>
if typ c then
S.Return ()
else
S.Continue (c, ()),
exp = fn e => fn () =>
if exp e then
S.Return ()
else
S.Continue (e, ())} k () of
S.Return _ => true
| S.Continue _ => false
end
structure Decl = struct
datatype binder = datatype Exp.binder
fun mapfoldB {typ = fc, exp = fe, decl = fd, bind} =
let
val mft = Typ.mapfold fc
val mfe = Exp.mapfoldB {typ = fc, exp = fe, bind = bind}
fun mfd ctx d acc =
S.bindP (mfd' ctx d acc, fd ctx)
and mfd' ctx (dAll as (d, loc)) =
case d of
DVal (x, n, t, e) =>
S.bind2 (mft t,
fn t' =>
S.map2 (mfe ctx e,
fn e' =>
(DVal (x, n, t', e'), loc)))
| DFun (n, x, dom, ran, e) =>
S.bind2 (mft dom,
fn dom' =>
S.bind2 (mft ran,
fn ran' =>
S.map2 (mfe ctx e,
fn e' =>
(DFun (n, x, dom', ran', e'), loc))))
in
mfd
end
fun mapfold {typ = fc, exp = fe, decl = fd} =
mapfoldB {typ = fc,
exp = fn () => fe,
decl = fn () => fd,
bind = fn ((), _) => ()} ()
fun fold {typ, exp, decl} s d =
case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
exp = fn e => fn s => S.Continue (e, exp (e, s)),
decl = fn d => fn s => S.Continue (d, decl (d, s))} d s of
S.Continue (_, s) => s
| S.Return _ => raise Fail "FlatUtil.Decl.fold: Impossible"
end
structure File = struct
datatype binder =
NamedT of string * int * typ option
| RelE of string * typ
| NamedE of string * int * typ * exp option
| F of int * string * Flat.typ * Flat.typ * Flat.exp
fun mapfoldB (all as {bind, ...}) =
let
val mfd = Decl.mapfoldB all
fun mff ctx ds =
case ds of
nil => S.return2 nil
| d :: ds' =>
S.bind2 (mfd ctx d,
fn d' =>
let
val b =
case #1 d' of
DVal (x, n, t, e) => NamedE (x, n, t, SOME e)
| DFun v => F v
val ctx' = bind (ctx, b)
in
S.map2 (mff ctx' ds',
fn ds' =>
d' :: ds')
end)
in
mff
end
fun mapfold {typ = fc, exp = fe, decl = fd} =
mapfoldB {typ = fc,
exp = fn () => fe,
decl = fn () => fd,
bind = fn ((), _) => ()} ()
fun mapB {typ, exp, decl, bind} ctx ds =
case mapfoldB {typ = fn c => fn () => S.Continue (typ c, ()),
exp = fn ctx => fn e => fn () => S.Continue (exp ctx e, ()),
decl = fn ctx => fn d => fn () => S.Continue (decl ctx d, ()),
bind = bind} ctx ds () of
S.Continue (ds, ()) => ds
| S.Return _ => raise Fail "FlatUtil.File.mapB: Impossible"
fun fold {typ, exp, decl} s d =
case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
exp = fn e => fn s => S.Continue (e, exp (e, s)),
decl = fn d => fn s => S.Continue (d, decl (d, s))} d s of
S.Continue (_, s) => s
| S.Return _ => raise Fail "FlatUtil.File.fold: Impossible"
end
end
|
