src/domain.sml

   1 (* HCoop Domtool (http://hcoop.sourceforge.net/)
   2  * Copyright (c) 2006, Adam Chlipala
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  *)
  18
  19 (* Domain-related primitive actions *)
  20
  21 structure Domain :> DOMAIN = struct
  22
  23 fun isIdent ch = Char.isLower ch orelse Char.isDigit ch
  24
  25 fun validHost s =
  26     size s > 0 andalso size s < 20
  27     andalso CharVector.all (fn ch => isIdent ch orelse ch = #"-") s
  28
  29 fun validDomain s =
  30     size s > 0 andalso size s < 100
  31     andalso List.all validHost (String.fields (fn ch => ch = #".") s)
  32
  33 val _ = Env.type_one "host"
  34         Env.string
  35         validHost
  36
  37 val _ = Env.type_one "domain"
  38         Env.string
  39         validDomain
  40
  41 open Ast
  42
  43 val befores = ref (fn (_ : string) => ())
  44 val afters = ref (fn (_ : string) => ())
  45
  46 fun registerBefore f =
  47     let
  48         val old = !befores
  49     in
  50         befores := (fn x => (old x; f x))
  51     end
  52
  53 fun registerAfter f =
  54     let
  55         val old = !afters
  56     in
  57         afters := (fn x => (old x; f x))
  58     end
  59
  60 val current = ref ""
  61 val currentPath = ref ""
  62
  63 fun currentDomain () = !current
  64
  65 fun domainFile name = TextIO.openOut (!currentPath ^ name)
  66
  67 fun getPath domain =
  68     let
  69         val toks = String.fields (fn ch => ch = #".") domain
  70
  71         val elems = foldr (fn (piece, elems) =>
  72                               let
  73                                   val elems = piece :: elems
  74                                   val path = String.concatWith "/" (Config.resultRoot :: rev elems)
  75                               in
  76                                   (if Posix.FileSys.ST.isDir
  77                                           (Posix.FileSys.stat path) then
  78                                        ()
  79                                    else
  80                                        (OS.FileSys.remove path;
  81                                         OS.FileSys.mkDir path))
  82                                   handle OS.SysErr _ => OS.FileSys.mkDir path;
  83                                   elems
  84                               end) [] toks
  85     in
  86         String.concatWith "/" (Config.resultRoot :: rev ("" :: elems))
  87     end
  88
  89 val _ = Env.container_one "domain"
  90                           ("domain", Env.string)
  91                           (fn dom => (current := dom;
  92                                       currentPath := getPath dom;
  93                                       !befores dom),
  94                            fn () => !afters (!current))
  95
  96 end