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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 var' =
CRel' of int * kind
| CNamed' of int * kind
datatype var =
CNotBound
| CRel of int * kind
| CNamed of int * kind
type env = {
renameC : var' SM.map,
relC : (string * kind) list,
namedC : (string * kind) IM.map
}
val namedCounter = ref 0
val empty = {
renameC = SM.empty,
relC = [],
namedC = IM.empty
}
fun pushCRel (env : env) x k =
let
val renameC = SM.map (fn CRel' (n, k) => CRel' (n+1, k)
| x => x) (#renameC env)
in
{renameC = SM.insert (renameC, x, CRel' (0, k)),
relC = (x, k) :: #relC env,
namedC = #namedC env}
end
fun lookupCRel (env : env) n =
(List.nth (#relC env, n))
handle Subscript => raise UnboundRel n
fun pushCNamed (env : env) x k =
let
val n = !namedCounter
in
namedCounter := n + 1;
({renameC = SM.insert (#renameC env, x, CNamed' (n, k)),
relC = #relC env,
namedC = IM.insert (#namedC env, n, (x, k))},
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 => CNotBound
| SOME (CRel' x) => CRel x
| SOME (CNamed' x) => CNamed x
end
|
