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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 ElabEnv :> ELAB_ENV = struct
open Elab
structure IM = IntBinaryMap
structure SM = BinaryMapFn(struct
type ord_key = string
val compare = String.compare
end)
exception UnboundRel of int
exception UnboundNamed of int
datatype 'a var' =
Rel' of int * 'a
| Named' of int * 'a
datatype 'a var =
NotBound
| Rel of int * 'a
| Named of int * 'a
type env = {
renameC : kind var' SM.map,
relC : (string * kind) list,
namedC : (string * kind * con option) IM.map,
renameE : con var' SM.map,
relE : (string * con) list,
namedE : (string * con) IM.map
}
val namedCounter = ref 0
val empty = {
renameC = SM.empty,
relC = [],
namedC = IM.empty,
renameE = SM.empty,
relE = [],
namedE = IM.empty
}
fun pushCRel (env : env) x k =
let
val renameC = SM.map (fn Rel' (n, k) => Rel' (n+1, k)
| x => x) (#renameC env)
in
{renameC = SM.insert (renameC, x, Rel' (0, k)),
relC = (x, k) :: #relC env,
namedC = #namedC env,
renameE = #renameE env,
relE = #relE env,
namedE = #namedE env}
end
fun lookupCRel (env : env) n =
(List.nth (#relC env, n))
handle Subscript => raise UnboundRel n
fun pushCNamedAs (env : env) x n k co =
{renameC = SM.insert (#renameC env, x, Named' (n, k)),
relC = #relC env,
namedC = IM.insert (#namedC env, n, (x, k, co)),
renameE = #renameE env,
relE = #relE env,
namedE = #namedE env}
fun pushCNamed env x k co =
let
val n = !namedCounter
in
namedCounter := n + 1;
(pushCNamedAs env x n k co, n)
end
fun lookupCNamed (env : env) n =
case IM.find (#namedC env, n) of
NONE => raise UnboundNamed n
| SOME x => x
fun lookupC (env : env) x =
case SM.find (#renameC env, x) of
NONE => NotBound
| SOME (Rel' x) => Rel x
| SOME (Named' x) => Named x
fun pushERel (env : env) x t =
let
val renameE = SM.map (fn Rel' (n, t) => Rel' (n+1, t)
| x => x) (#renameE env)
in
{renameC = #renameC env,
relC = #relC env,
namedC = #namedC env,
renameE = SM.insert (renameE, x, Rel' (0, t)),
relE = (x, t) :: #relE env,
namedE = #namedE env}
end
fun lookupERel (env : env) n =
(List.nth (#relE env, n))
handle Subscript => raise UnboundRel n
fun pushENamedAs (env : env) x n t =
{renameC = #renameC env,
relC = #relC env,
namedC = #namedC env,
renameE = SM.insert (#renameE env, x, Named' (n, t)),
relE = #relE env,
namedE = IM.insert (#namedE env, n, (x, t))}
fun pushENamed env x t =
let
val n = !namedCounter
in
namedCounter := n + 1;
(pushENamedAs env x n t, n)
end
fun lookupENamed (env : env) n =
case IM.find (#namedE env, n) of
NONE => raise UnboundNamed n
| SOME x => x
fun lookupE (env : env) x =
case SM.find (#renameE env, x) of
NONE => NotBound
| SOME (Rel' x) => Rel x
| SOME (Named' x) => Named x
end
|
