| 1 | (* |
| 2 | Domtool (http://hcoop.sf.net/) |
| 3 | Copyright (C) 2004 Adam Chlipala |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU General Public License |
| 7 | as published by the Free Software Foundation; either version 2 |
| 8 | of the License, or (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software |
| 17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | *) |
| 19 | |
| 20 | (* Utility functions *) |
| 21 | |
| 22 | structure Util :> UTIL = |
| 23 | struct |
| 24 | fun impLoop next stop body init = |
| 25 | let |
| 26 | fun loop state = |
| 27 | let |
| 28 | val v = next () |
| 29 | in |
| 30 | if stop v then |
| 31 | () |
| 32 | else |
| 33 | loop (body (v, state)) |
| 34 | end |
| 35 | in |
| 36 | loop init |
| 37 | end |
| 38 | |
| 39 | fun ioLoop next body init = impLoop next (fn s => s = "") body init |
| 40 | fun ioOptLoop next body init = |
| 41 | let |
| 42 | fun loop state = |
| 43 | case next () of |
| 44 | NONE => () |
| 45 | | SOME v => loop (body (v, state)) |
| 46 | in |
| 47 | loop init |
| 48 | end |
| 49 | |
| 50 | fun isIdent ch = Char.isLower ch orelse Char.isDigit ch |
| 51 | |
| 52 | fun validHost s = |
| 53 | size s > 0 andalso size s < 20 andalso List.all isIdent (String.explode s) |
| 54 | |
| 55 | fun validDomain s = |
| 56 | size s > 0 andalso size s < 100 andalso List.all validHost (String.fields (fn ch => ch = #".") s) |
| 57 | |
| 58 | fun validUser s = |
| 59 | size s > 0 andalso size s < 20 andalso List.all |
| 60 | (fn ch => isIdent ch orelse ch = #"." orelse ch = #"_" orelse ch = #"-" orelse ch = #"+") |
| 61 | (String.explode s) |
| 62 | |
| 63 | fun validEmail s = |
| 64 | (case String.fields (fn ch => ch = #"@") s of |
| 65 | [user, host] => validUser user andalso validDomain host |
| 66 | | _ => false) |
| 67 | |
| 68 | fun isTmp s = |
| 69 | List.exists (fn ch => ch = #"#" orelse ch = #"~") (String.explode s) |
| 70 | |
| 71 | fun validIp s = |
| 72 | (case map Int.fromString (String.fields (fn ch => ch = #".") s) of |
| 73 | [SOME n1, SOME n2, SOME n3, SOME n4] => |
| 74 | n1 >= 0 andalso n1 < 256 andalso n2 >= 0 andalso n2 < 256 andalso n3 >= 0 andalso n3 < 256 andalso n4 >= 0 andalso n4 < 256 |
| 75 | | _ => false) |
| 76 | |
| 77 | fun trimLast s = |
| 78 | if size s = 0 then |
| 79 | s |
| 80 | else |
| 81 | String.substring (s, 0, size s - 1) |
| 82 | |
| 83 | fun toDir s = |
| 84 | foldr (fn (a, s) => s ^ "/" ^ a) "" (String.tokens (fn ch => ch = #".") s) |
| 85 | |
| 86 | fun checkPath (paths, path) = |
| 87 | StringSet.exists (fn pref => path = pref orelse (size path >= size pref + 2 andalso substring (path, 0, size pref) = pref |
| 88 | andalso String.sub (path, size pref) = #"/")) paths |
| 89 | andalso List.all (fn s => s <> "..") (String.fields (fn ch => ch = #"/") path) |
| 90 | |
| 91 | fun resolveAddr (vars, s) = |
| 92 | if validIp s then |
| 93 | s |
| 94 | else |
| 95 | (case StringMap.find (vars, s) of |
| 96 | NONE => "" |
| 97 | | SOME v => |
| 98 | if validIp v then |
| 99 | v |
| 100 | else |
| 101 | "") |
| 102 | |
| 103 | fun resolveDomain (vars, s) = |
| 104 | if validDomain s then |
| 105 | s |
| 106 | else |
| 107 | (case StringMap.find (vars, s) of |
| 108 | NONE => "" |
| 109 | | SOME v => |
| 110 | if validDomain v then |
| 111 | v |
| 112 | else |
| 113 | "") |
| 114 | end |
| 115 | |