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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 | (* CGI interaction *) | |
21 | ||
22 | structure Web :> WEB = | |
23 | struct | |
24 | val params : string StringMap.map ref = ref StringMap.empty | |
25 | ||
26 | val paramStack : string StringMap.map list ref = ref [] | |
27 | ||
28 | fun setParam (n, v) = params := StringMap.insert (!params, n, v) | |
29 | ||
30 | fun getParam v = | |
31 | (case StringMap.find (!params, v) of | |
32 | NONE => "" | |
33 | | SOME s => s) | |
34 | ||
35 | fun pushParams nvs = | |
36 | (paramStack := (!params) :: (!paramStack); | |
37 | app setParam nvs) | |
38 | ||
39 | fun popParams () = | |
40 | (case !paramStack of | |
41 | [] => raise Fail "Empty params stack in popParams" | |
42 | | h::t => (params := h; | |
43 | paramStack := t)) | |
44 | ||
45 | fun withParams f nvs = | |
46 | (pushParams nvs; | |
47 | ((f ()) handle ex => (popParams (); raise ex)) | |
48 | before popParams ()) | |
49 | ||
50 | val text = ref ([] : string list) | |
51 | ||
52 | fun print x = text := x :: (!text) | |
53 | ||
54 | fun output () = | |
55 | (TextIO.print "Status: 200\nContent-type: text/html\n\n"; | |
56 | TextIO.print (String.concat (List.rev (!text)))) | |
57 | end |