1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
2 ;;;; *************************************************************************
3 ;;;; FILE IDENTIFICATION
5 ;;;; Name: web-utils.lisp
6 ;;;; Purpose: Basic web utility functions
7 ;;;; Programmer: Kevin M. Rosenberg
8 ;;;; Date Started: Apr 2000
10 ;;;; $Id: web-utils.lisp,v 1.13 2003/06/15 07:48:30 kevin Exp $
12 ;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
14 ;;;; KMRCL users are granted the rights to distribute and use this software
15 ;;;; as governed by the terms of the Lisp Lesser GNU Public License
16 ;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
17 ;;;; *************************************************************************
22 ;;; HTML/XML constants
24 (defvar *standard-xml-header*
25 #.(format nil "<?xml version=\"1.0\" encoding=\"iso-8859-1\" standalone=\"yes\"?>~%"))
27 (defvar *standard-html-header* "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML//EN\">")
29 (defvar *standard-xhtml-header*
30 #.(format nil "<?xml version=\"1.0\" encoding=\"iso-8859-1\" standalone=\"yes\"?>~%<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.1//EN\" \"http://www.w3.org/TR/xhtml11/DTD/xhtml11\">"))
33 ;;; User agent functions
35 (defun user-agent-ie-p (agent)
36 "Takes a user-agent string and returns T for Internet Explorer."
37 (or (string-starts-with "Microsoft" agent)
38 (string-starts-with "Internet Explore" agent)
39 (search "MSIE" agent)))
43 (defvar *base-url* "")
44 (defun base-url! (url)
45 (setq *base-url* url))
47 (defun make-url (page-name &key (base-dir *base-url*) (format :html) (vars nil))
48 (let ((amp (case format
56 (let ((first-var (first vars)))
58 "?" (car first-var) "=" (cadr first-var)
61 (when (and (car var) (cadr var))
63 amp (car var) "=" (cadr var))))
67 (defun make-url-new (page-name &key (base-dir *base-url*) (format :html)
69 (let ((amp (ecase format
71 ((:xml :ie-xml) "&"))))
75 (let ((first-var (first vars)))
77 "?" (car first-var) "=" (cadr first-var)
80 (when (and (car var) (cadr var))
82 amp (car var) "=" (cadr var))))
86 (defun decode-uri-query-string (s)
87 "Decode a URI query string field"
88 (declare (simple-string s)
89 (optimize (speed 3) (safety 0) (space 0)))
90 (do* ((old-len (length s))
91 (new-len (- old-len (* 2 (count-string-char s #\%))))
92 (new (make-string new-len))
95 ((= p-new new-len) new)
96 (declare (simple-string new)
97 (fixnum p-old p-new old-len new-len))
98 (let ((c (schar s p-old)))
103 (unless (>= old-len (+ p-old 3))
104 (error "#\% not followed by enough characters"))
105 (setf (schar new p-new)
107 (parse-integer (subseq s (1+ p-old) (+ p-old 3))
111 (setf (schar new p-new) c)