(* Copyright (c) 2008-2009, 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.
 *)

signature SETTINGS = sig
    
    (* How do all application URLs begin? *)
    val setUrlPrefix : string -> unit
    val getUrlPrefix : unit -> string

    (* How many seconds should the server wait before assuming a Comet client has left? *)
    val setTimeout : int -> unit
    val getTimeout : unit -> int

    (* Which C header files are needed? *)
    val setHeaders : string list -> unit
    val getHeaders : unit -> string list

    (* Which extra JavaScript URLs should be included? *)
    val setScripts : string list -> unit
    val getScripts : unit -> string list

    type ffi = string * string

    (* Which FFI types may be sent from clients to servers? *)
    val setClientToServer : ffi list -> unit
    val mayClientToServer : ffi -> bool

    (* Which FFI functions have side effects? *)
    val setEffectful : ffi list -> unit
    val isEffectful : ffi -> bool

    (* Which FFI functions may only be run in clients? *)
    val setClientOnly : ffi list -> unit
    val isClientOnly : ffi -> bool

    (* Which FFI functions may only be run on servers? *)
    val setServerOnly : ffi list -> unit
    val isServerOnly : ffi -> bool

    (* Which FFI functions may be run in JavaScript?  (JavaScript function names included) *)
    val setJsFuncs : (ffi * string) list -> unit
    val jsFunc : ffi -> string option

    datatype pattern_kind = Exact | Prefix
    datatype action = Allow | Deny
    type rule = { action : action, kind : pattern_kind, pattern : string }

    datatype path_kind = Any | Url | Table | Sequence | View | Relation | Cookie | Style
    type rewrite = { pkind : path_kind, kind : pattern_kind, from : string, to : string }

    (* Rules for rewriting URLs from canonical forms *)
    val setRewriteRules : rewrite list -> unit
    val rewrite : path_kind -> string -> string

    (* Validating URLs and MIME types *)
    val setUrlRules : rule list -> unit
    val getUrlRules : unit -> rule list
    val checkUrl : string -> bool

    val setMimeRules : rule list -> unit
    val getMimeRules : unit -> rule list
    val checkMime : string -> bool

    (* Web protocols that generated programs may speak *)
    type protocol = {
        name : string,      (* Call it this on the command line *)
        link : string,      (* Pass these linker arguments *)
        supportsPush : bool (* Is Ur/Web message-passing supported? *)
    }
    val addProtocol : protocol -> unit
    val getProtocol : string -> protocol option
    val setProtocol : string -> unit
    val currentProtocol : unit -> protocol

    val setDebug : bool -> unit
    val getDebug : unit -> bool

end