| 1 | (* |
| 2 | * Dynamic web page generation with Standard ML |
| 3 | * Copyright (C) 2003 Adam Chlipala |
| 4 | * |
| 5 | * This library is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU Lesser General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 2.1 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This library 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 GNU |
| 13 | * Lesser General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Lesser General Public |
| 16 | * License along with this library; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | *) |
| 19 | |
| 20 | (* Common convenience stuff to open in several places *) |
| 21 | |
| 22 | structure Common = |
| 23 | struct |
| 24 | exception Skip |
| 25 | exception Format of string |
| 26 | |
| 27 | fun error (pos, msg) = (ErrorMsg.error pos msg; |
| 28 | raise Skip) |
| 29 | |
| 30 | fun error' (pos, msg) = ErrorMsg.error pos msg |
| 31 | |
| 32 | type 'a map = 'a StringMap.map |
| 33 | |
| 34 | val insert = StringMap.insert |
| 35 | fun contains x = isSome (StringMap.find x) |
| 36 | |
| 37 | fun lookup (D, v, pos) = |
| 38 | (case StringMap.find (D, v) of |
| 39 | NONE => error (pos, "Unbound tycon " ^ v) |
| 40 | | SOME r => r) |
| 41 | |
| 42 | type 'a nmap = 'a IntBinaryMap.map |
| 43 | |
| 44 | val ninsert = IntBinaryMap.insert |
| 45 | fun ncontains x = isSome (IntBinaryMap.find x) |
| 46 | |
| 47 | fun nlookup (D, v, pos) = |
| 48 | (case IntBinaryMap.find (D, v) of |
| 49 | NONE => error (pos, "BAD: Unbound tyname or tvname " ^ Int.toString v) |
| 50 | | SOME r => r) |
| 51 | |
| 52 | type ident = string |
| 53 | |
| 54 | fun indexAfter (str, i, ch) = |
| 55 | let |
| 56 | val sz = size str |
| 57 | fun search i = |
| 58 | if i >= sz then |
| 59 | NONE |
| 60 | else if String.sub(str, i) = ch then |
| 61 | SOME i |
| 62 | else |
| 63 | search (i+1) |
| 64 | in |
| 65 | search i |
| 66 | end |
| 67 | |
| 68 | fun indexDoubleAfter (str, i, ch) = |
| 69 | let |
| 70 | val sz = size str-1 |
| 71 | fun search i = |
| 72 | if i >= sz then |
| 73 | NONE |
| 74 | else if String.sub(str, i) = ch andalso String.sub(str, i+1) = ch then |
| 75 | SOME i |
| 76 | else |
| 77 | search (i+1) |
| 78 | in |
| 79 | search i |
| 80 | end |
| 81 | |
| 82 | fun index (str, ch) = indexAfter (str, 0, ch) |
| 83 | |
| 84 | fun strLower str = String.implode (map Char.toLower (String.explode str)) |
| 85 | |
| 86 | fun trim str = |
| 87 | let |
| 88 | fun killFront L = |
| 89 | (case L of |
| 90 | ch::rest => |
| 91 | if Char.isSpace ch then |
| 92 | killFront rest |
| 93 | else |
| 94 | L |
| 95 | | [] => []) |
| 96 | in |
| 97 | String.implode (rev (killFront (rev (killFront (String.explode str))))) |
| 98 | end |
| 99 | |
| 100 | fun copyFile (src, dst) = |
| 101 | if src = dst then |
| 102 | () |
| 103 | else |
| 104 | let |
| 105 | val inf = TextIO.openIn src |
| 106 | val outf = TextIO.openOut dst |
| 107 | |
| 108 | fun copy () = |
| 109 | (case TextIO.inputLine inf of |
| 110 | NONE => () |
| 111 | | SOME line => (TextIO.output (outf, line); |
| 112 | copy ())) |
| 113 | in |
| 114 | copy (); |
| 115 | TextIO.closeIn inf; |
| 116 | TextIO.closeOut outf |
| 117 | end |
| 118 | |
| 119 | fun writeToFile (fname, txt) = |
| 120 | let |
| 121 | val outf = TextIO.openOut fname |
| 122 | in |
| 123 | TextIO.output (outf, txt); |
| 124 | TextIO.closeOut outf |
| 125 | end |
| 126 | |
| 127 | fun readFromFile fname = |
| 128 | let |
| 129 | val inf = TextIO.openIn fname |
| 130 | fun read acc = |
| 131 | (case TextIO.inputLine inf of |
| 132 | NONE => String.concat (rev acc) |
| 133 | | SOME line => read (line::acc)) |
| 134 | in |
| 135 | read [] |
| 136 | before TextIO.closeIn inf |
| 137 | end |
| 138 | |
| 139 | |
| 140 | fun listToString (f, F, L) [] = "" |
| 141 | | listToString (f, F, L) [id] = F ^ f id ^ L |
| 142 | | listToString (f, F, L) (h::t) = foldl (fn (id, s) => s ^ ", " ^ f id) (F ^ f h) t ^ L |
| 143 | |
| 144 | fun idListToString (F, L) list = listToString (fn x => x, F, L) list |
| 145 | |
| 146 | val stringListToString = idListToString ("[", "]") |
| 147 | |
| 148 | fun urlDecode s = |
| 149 | let |
| 150 | fun decode (L, acc) = |
| 151 | (case L of |
| 152 | [] => String.implode (rev acc) |
| 153 | | #"+"::L => decode (L, #" "::acc) |
| 154 | | #"%"::MS::LS::L => |
| 155 | (case StringCvt.scanString (Int.scan StringCvt.HEX) (str MS ^ str LS) of |
| 156 | NONE => decode (L, LS::MS:: #"%"::acc) |
| 157 | | SOME n => decode (L, chr n :: acc)) |
| 158 | | ch::L => decode (L, ch::acc)) |
| 159 | in |
| 160 | decode (String.explode s, []) |
| 161 | end |
| 162 | |
| 163 | fun pad (s, n) = |
| 164 | if size s < n then |
| 165 | pad ("0" ^ s, n) |
| 166 | else |
| 167 | s |
| 168 | |
| 169 | fun urlEncode s = |
| 170 | let |
| 171 | fun xch ch = |
| 172 | if Char.isAlphaNum ch orelse ch = #"_" orelse ch = #"." orelse ch = #"-" then |
| 173 | str ch |
| 174 | else if ch = #" " then |
| 175 | "+" |
| 176 | else |
| 177 | "%" ^ pad (Int.fmt StringCvt.HEX (ord ch), 2) |
| 178 | in |
| 179 | String.concat (map xch (String.explode s)) |
| 180 | end |
| 181 | |
| 182 | fun stoiOpt s = Int.fromString s |
| 183 | fun stoi s = |
| 184 | (case Int.fromString s of |
| 185 | NONE => raise Format s |
| 186 | | SOME i => i) |
| 187 | fun itos n = |
| 188 | if n < 0 then |
| 189 | "-" ^ Int.toString (~n) |
| 190 | else |
| 191 | Int.toString n |
| 192 | |
| 193 | fun storOpt s = Real.fromString s |
| 194 | fun stor s = |
| 195 | (case Real.fromString s of |
| 196 | NONE => raise Format s |
| 197 | | SOME r => r) |
| 198 | fun rtos r = |
| 199 | if r < 0.0 then |
| 200 | "-" ^ Real.toString (~r) |
| 201 | else |
| 202 | Real.toString r |
| 203 | |
| 204 | fun html s = |
| 205 | let |
| 206 | fun xch #"<" = "<" |
| 207 | | xch #">" = ">" |
| 208 | | xch #"&" = "&" |
| 209 | | xch #"\"" = """ |
| 210 | | xch ch = str ch |
| 211 | in |
| 212 | foldr op^ "" (map xch (String.explode s)) |
| 213 | end |
| 214 | |
| 215 | fun htmlNl s = |
| 216 | let |
| 217 | fun xch #"<" = "<" |
| 218 | | xch #">" = ">" |
| 219 | | xch #"&" = "&" |
| 220 | | xch #"\"" = """ |
| 221 | | xch #"\n" = "<br />" |
| 222 | | xch ch = str ch |
| 223 | in |
| 224 | foldr op^ "" (map xch (String.explode s)) |
| 225 | end |
| 226 | |
| 227 | fun killLf s = String.implode (List.filter (fn ch => ch <> #"\r") (String.explode s)) |
| 228 | end |