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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 CoreEnv :> CORE_ENV = struct
open Core
structure U = CoreUtil
structure IM = IntBinaryMap
(* AST utility functions *)
val liftConInCon =
U.Con.mapB {kind = fn k => k,
con = fn bound => fn c =>
case c of
CRel xn =>
if xn < bound then
c
else
CRel (xn + 1)
| _ => c,
bind = fn (bound, U.Con.Rel _) => bound + 1
| (bound, _) => bound}
val lift = liftConInCon 0
val subConInCon =
U.Con.mapB {kind = fn k => k,
con = fn (xn, rep) => fn c =>
case c of
CRel xn' =>
(case Int.compare (xn', xn) of
EQUAL => #1 rep
| GREATER => CRel (xn' - 1)
| LESS => c)
| _ => c,
bind = fn ((xn, rep), U.Con.Rel _) => (xn+1, liftConInCon 0 rep)
| (ctx, _) => ctx}
val liftConInExp =
U.Exp.mapB {kind = fn k => k,
con = fn bound => fn c =>
case c of
CRel xn =>
if xn < bound then
c
else
CRel (xn + 1)
| _ => c,
exp = fn _ => fn e => e,
bind = fn (bound, U.Exp.RelC _) => bound + 1
| (bound, _) => bound}
val subConInExp =
U.Exp.mapB {kind = fn k => k,
con = fn (xn, rep) => fn c =>
case c of
CRel xn' =>
(case Int.compare (xn', xn) of
EQUAL => #1 rep
| GREATER => CRel (xn' - 1)
| LESS => c)
| _ => c,
exp = fn _ => fn e => e,
bind = fn ((xn, rep), U.Exp.RelC _) => (xn+1, liftConInCon 0 rep)
| (ctx, _) => ctx}
(* Back to environments *)
exception UnboundRel of int
exception UnboundNamed of int
type env = {
relC : (string * kind) list,
namedC : (string * kind * con option) IM.map,
datatypes : (string * string list * (string * int * con option) list) IM.map,
constructors : (string * string list * con option * int) IM.map,
relE : (string * con) list,
namedE : (string * con * exp option * string) IM.map
}
val empty = {
relC = [],
namedC = IM.empty,
datatypes = IM.empty,
constructors = IM.empty,
relE = [],
namedE = IM.empty
}
fun pushCRel (env : env) x k =
{relC = (x, k) :: #relC env,
namedC = IM.map (fn (x, k, co) => (x, k, Option.map lift co)) (#namedC env),
datatypes = #datatypes env,
constructors = #constructors env,
relE = map (fn (x, c) => (x, lift c)) (#relE env),
namedE = IM.map (fn (x, c, eo, s) => (x, lift c, eo, s)) (#namedE env)}
fun lookupCRel (env : env) n =
(List.nth (#relC env, n))
handle Subscript => raise UnboundRel n
fun pushCNamed (env : env) x n k co =
{relC = #relC env,
namedC = IM.insert (#namedC env, n, (x, k, co)),
datatypes = #datatypes env,
constructors = #constructors env,
relE = #relE env,
namedE = #namedE env}
fun lookupCNamed (env : env) n =
case IM.find (#namedC env, n) of
NONE => raise UnboundNamed n
| SOME x => x
fun pushDatatype (env : env) x n xs xncs =
{relC = #relC env,
namedC = #namedC env,
datatypes = IM.insert (#datatypes env, n, (x, xs, xncs)),
constructors = foldl (fn ((x, n', to), constructors) =>
IM.insert (constructors, n', (x, xs, to, n)))
(#constructors env) xncs,
relE = #relE env,
namedE = #namedE env}
fun lookupDatatype (env : env) n =
case IM.find (#datatypes env, n) of
NONE => raise UnboundNamed n
| SOME x => x
fun lookupConstructor (env : env) n =
case IM.find (#constructors env, n) of
NONE => raise UnboundNamed n
| SOME x => x
fun pushERel (env : env) x t =
{relC = #relC env,
namedC = #namedC env,
datatypes = #datatypes env,
constructors = #constructors env,
relE = (x, t) :: #relE env,
namedE = #namedE env}
fun lookupERel (env : env) n =
(List.nth (#relE env, n))
handle Subscript => raise UnboundRel n
fun pushENamed (env : env) x n t eo s =
{relC = #relC env,
namedC = #namedC env,
datatypes = #datatypes env,
constructors = #constructors env,
relE = #relE env,
namedE = IM.insert (#namedE env, n, (x, t, eo, s))}
fun lookupENamed (env : env) n =
case IM.find (#namedE env, n) of
NONE => raise UnboundNamed n
| SOME x => x
fun declBinds env (d, loc) =
case d of
DCon (x, n, k, c) => pushCNamed env x n k (SOME c)
| DDatatype (x, n, xs, xncs) =>
let
val env = pushDatatype env x n xs xncs
val env = pushCNamed env x n (KType, loc) NONE
in
foldl (fn ((x', n', NONE), env) => pushENamed env x' n' (CNamed n, loc) NONE ""
| ((x', n', SOME t), env) => pushENamed env x' n' (TFun (t, (CNamed n, loc)), loc) NONE "")
env xncs
end
| DVal (x, n, t, e, s) => pushENamed env x n t (SOME e) s
| DValRec vis => foldl (fn ((x, n, t, e, s), env) => pushENamed env x n t NONE s) env vis
| DExport _ => env
| DTable (x, n, c, s) =>
let
val t = (CApp ((CFfi ("Basis", "sql_table"), loc), c), loc)
in
pushENamed env x n t NONE s
end
| DSequence (x, n, s) =>
let
val t = (CFfi ("Basis", "sql_sequence"), loc)
in
pushENamed env x n t NONE s
end
| DDatabase _ => env
fun patBinds env (p, loc) =
case p of
PWild => env
| PVar (x, t) => pushERel env x t
| PPrim _ => env
| PCon (_, _, _, NONE) => env
| PCon (_, _, _, SOME p) => patBinds env p
| PRecord xps => foldl (fn ((_, p, _), env) => patBinds env p) env xps
end
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