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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 CjrEnv :> CJR_ENV = struct
open Cjr
structure IM = IntBinaryMap
exception UnboundRel of int
exception UnboundNamed of int
exception UnboundF of int
exception UnboundStruct of int
type env = {
datatypes : (string * (string * int * typ option) list) IM.map,
constructors : (string * typ option * int) IM.map,
numRelE : int,
relE : (string * typ) list,
namedE : (string * typ) IM.map,
structs : (string * typ) list IM.map
}
val empty : env = {
datatypes = IM.empty,
constructors = IM.empty,
numRelE = 0,
relE = [],
namedE = IM.empty,
structs = IM.insert (IM.empty, 0, [])
}
fun pushDatatype (env : env) x n xncs =
{datatypes = IM.insert (#datatypes env, n, (x, xncs)),
constructors = foldl (fn ((x, n', to), constructors) =>
IM.insert (constructors, n', (x, to, n)))
(#constructors env) xncs,
numRelE = #numRelE env,
relE = #relE env,
namedE = #namedE env,
structs = #structs 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 =
{datatypes = #datatypes env,
constructors = #constructors env,
numRelE = #numRelE env + 1,
relE = (x, t) :: #relE env,
namedE = #namedE env,
structs = #structs env}
fun lookupERel (env : env) n =
(List.nth (#relE env, n))
handle Subscript => raise UnboundRel n
fun countERels (env : env) = #numRelE env
fun listERels (env : env) = #relE env
fun pushENamed (env : env) x n t =
{datatypes = #datatypes env,
constructors = #constructors env,
numRelE = #numRelE env,
relE = #relE env,
namedE = IM.insert (#namedE env, n, (x, t)),
structs = #structs env}
fun lookupENamed (env : env) n =
case IM.find (#namedE env, n) of
NONE => raise UnboundNamed n
| SOME x => x
fun pushStruct (env : env) n xts =
{datatypes = #datatypes env,
constructors = #constructors env,
numRelE = #numRelE env,
relE = #relE env,
namedE = #namedE env,
structs = IM.insert (#structs env, n, xts)}
fun lookupStruct (env : env) n =
case IM.find (#structs env, n) of
NONE => raise UnboundStruct n
| SOME x => x
fun classifyDatatype xncs =
if List.all (fn (_, _, NONE) => true | _ => false) xncs then
Enum
else
Default
fun declBinds env (d, loc) =
case d of
DDatatype (_, x, n, xncs) =>
let
val env = pushDatatype env x n xncs
val dt = (TDatatype (classifyDatatype xncs, n, ref xncs), loc)
in
foldl (fn ((x', n', NONE), env) => pushENamed env x' n' dt
| ((x', n', SOME t), env) => pushENamed env x' n' (TFun (t, dt), loc))
env xncs
end
| DDatatypeForward (_, x, n) => pushDatatype env x n []
| DStruct (n, xts) => pushStruct env n xts
| DVal (x, n, t, _) => pushENamed env x n t
| DFun (fx, n, args, ran, _) =>
let
val t = foldl (fn ((_, arg), t) => (TFun (arg, t), loc)) ran args
in
pushENamed env fx n t
end
| DFunRec vis =>
foldl (fn ((fx, n, args, ran, _), env) =>
let
val t = foldl (fn ((_, arg), t) => (TFun (arg, t), loc)) ran args
in
pushENamed env fx n t
end) env vis
| DTable _ => env
| DSequence _ => env
| DDatabase _ => env
| DPreparedStatements _ => env
| DJavaScript _ => env
end
|
