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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.
*)
(* Pretty-printing C jr. *)
structure CjrPrint :> CJR_PRINT = struct
open Print.PD
open Print
open Cjr
structure E = CjrEnv
structure EM = ErrorMsg
val debug = ref false
val dummyTyp = (TNamed 0, ErrorMsg.dummySpan)
fun p_typ' par env (t, loc) =
case t of
TTop => string "void*"
| TFun (t1, t2) => parenIf par (box [p_typ' true env t2,
space,
string "(*)",
space,
string "(",
p_typ env t1,
string ")"])
| TRecord i => box [string "struct",
space,
string "__lws_",
string (Int.toString i)]
| TNamed n =>
(string ("__lwt_" ^ #1 (E.lookupTNamed env n) ^ "_" ^ Int.toString n)
handle CjrEnv.UnboundNamed _ => string ("__lwt_UNBOUND__" ^ Int.toString n))
| TFfi (m, x) => box [string "lw_", string m, string "_", string x]
and p_typ env = p_typ' false env
fun p_rel env n = string ("__lwr_" ^ #1 (E.lookupERel env n) ^ "_" ^ Int.toString (E.countERels env - n - 1))
handle CjrEnv.UnboundRel _ => string ("__lwr_UNBOUND_" ^ Int.toString (E.countERels env - n - 1))
fun p_enamed env n =
string ("__lwn_" ^ #1 (E.lookupENamed env n) ^ "_" ^ Int.toString n)
handle CjrEnv.UnboundNamed _ => string ("__lwn_UNBOUND_" ^ Int.toString n)
fun p_exp' par env (e, _) =
case e of
EPrim p => Prim.p_t p
| ERel n => p_rel env n
| ENamed n => p_enamed env n
| EFfi (m, x) => box [string "lw_", string m, string "_", string x]
| EFfiApp (m, x, es) => box [string "lw_",
string m,
string "_",
string x,
string "(ctx, ",
p_list (p_exp env) es,
string ")"]
| EApp (e1, e2) =>
let
fun unravel (f, acc) =
case #1 f of
EApp (f', arg) => unravel (f', arg :: acc)
| _ => (f, acc)
val (f, args) = unravel (e1, [e2])
in
parenIf par (box [p_exp' true env e1,
string "(ctx,",
space,
p_list_sep (box [string ",", space]) (p_exp env) args,
string ")"])
end
| ERecord (i, xes) => box [string "({",
space,
string "struct",
space,
string ("__lws_" ^ Int.toString i),
space,
string "__lw_tmp",
space,
string "=",
space,
string "{",
p_list (fn (_, e) =>
p_exp env e) xes,
string "};",
space,
string "__lw_tmp;",
space,
string "})" ]
| EField (e, x) =>
box [p_exp' true env e,
string ".",
string x]
| EWrite e => box [string "(lw_write(ctx, ",
p_exp env e,
string "), lw_unit_v)"]
| ESeq (e1, e2) => box [string "(",
p_exp env e1,
string ",",
space,
p_exp env e2,
string ")"]
and p_exp env = p_exp' false env
fun p_fun env (fx, n, args, ran, e) =
let
val nargs = length args
val env' = foldl (fn ((x, dom), env) => E.pushERel env x dom) env args
in
box [string "static",
space,
p_typ env ran,
space,
string ("__lwn_" ^ fx ^ "_" ^ Int.toString n),
string "(",
p_list_sep (box [string ",", space]) (fn x => x)
(string "lw_context ctx" :: ListUtil.mapi (fn (i, (_, dom)) =>
box [p_typ env dom,
space,
p_rel env' (nargs - i - 1)]) args),
string ")",
space,
string "{",
newline,
box[string "return(",
p_exp env' e,
string ");"],
newline,
string "}"]
end
fun p_decl env (dAll as (d, _) : decl) =
case d of
DStruct (n, xts) =>
box [string "struct",
space,
string ("__lws_" ^ Int.toString n),
space,
string "{",
newline,
p_list_sep (box []) (fn (x, t) => box [p_typ env t,
space,
string x,
string ";",
newline]) xts,
string "};"]
| DVal (x, n, t, e) =>
box [p_typ env t,
space,
string ("__lwn_" ^ x ^ "_" ^ Int.toString n),
space,
string "=",
space,
p_exp env e,
string ";"]
| DFun vi => p_fun env vi
| DFunRec vis =>
let
val env = E.declBinds env dAll
in
box [p_list_sep newline (fn (fx, n, args, ran, _) =>
box [string "static",
space,
p_typ env ran,
space,
string ("__lwn_" ^ fx ^ "_" ^ Int.toString n),
string "(lw_context,",
space,
p_list_sep (box [string ",", space])
(fn (_, dom) => p_typ env dom) args,
string ");"]) vis,
newline,
p_list_sep newline (p_fun env) vis,
newline]
end
fun unurlify (t, loc) =
case t of
TFfi ("Basis", "int") => string "lw_unurlifyInt(&request)"
| TFfi ("Basis", "float") => string "lw_unurlifyFloat(&request)"
| TFfi ("Basis", "string") => string "lw_unurlifyString(ctx, &request)"
| TRecord 0 => string "lw_unit_v"
| _ => (ErrorMsg.errorAt loc "Unable to choose a URL decoding function";
space)
fun p_page env (s, n, ts) =
box [string "if (!strncmp(request, \"",
string (String.toString s),
string "\", ",
string (Int.toString (size s)),
string ")) {",
newline,
string "request += ",
string (Int.toString (size s)),
string ";",
newline,
string "if (*request == '/') ++request;",
newline,
box [string "{",
newline,
box (ListUtil.mapi (fn (i, t) => box [p_typ env t,
space,
string "arg",
string (Int.toString i),
space,
string "=",
space,
unurlify t,
string ";",
newline]) ts),
p_enamed env n,
string "(",
p_list_sep (box [string ",", space])
(fn x => x)
(string "ctx" :: ListUtil.mapi (fn (i, _) => string ("arg" ^ Int.toString i)) ts),
string ");",
newline,
string "return;",
newline,
string "}",
newline,
string "}"]
]
fun p_file env (ds, ps) =
let
val (pds, env) = ListUtil.foldlMap (fn (d, env) =>
(p_decl env d,
E.declBinds env d))
env ds
val pds' = map (p_page env) ps
in
box [string "#include \"lacweb.h\"",
newline,
newline,
p_list_sep newline (fn x => x) pds,
newline,
string "void lw_handle(lw_context ctx, char *request) {",
newline,
p_list_sep newline (fn x => x) pds',
newline,
string "}",
newline]
end
end
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