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;;; url-expand.el --- expand-file-name for URLs
;; Author: $Author: wmperry $
;; Created: $Date: 1999/12/05 08:09:15 $
;; Version: $Revision: 1.3 $
;; Keywords: comm, data, processes
;;; Copyright (c) 1999 Free Software Foundation, Inc.
;;; This file is part of GNU Emacs.
;;; GNU Emacs is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 2, or (at your option)
;;; any later version.
;;; GNU Emacs is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; GNU General Public License for more details.
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Emacs; see the file COPYING. If not, write to the
;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;;; Boston, MA 02111-1307, USA.
(require 'url-methods)
(require 'url-util)
(require 'url-parse)
(defun url-expander-remove-relative-links (name)
;; Strip . and .. from pathnames
(let ((new (if (not (string-match "^/" name))
(concat "/" name)
;; If it ends with a '/.' or '/..', tack on a trailing '/' sot hat
;; the tests that follow are not too complicated in terms of
;; looking for '..' or '../', etc.
(if (string-match "/\\.+$" new)
(setq new (concat new "/")))
;; Remove '/./' first
(while (string-match "/\\(\\./\\)" new)
(setq new (concat (substring new 0 (match-beginning 1))
(substring new (match-end 1)))))
;; Then remove '/../'
(while (string-match "/\\([^/]*/\\.\\./\\)" new)
(setq new (concat (substring new 0 (match-beginning 1))
(substring new (match-end 1)))))
;; Remove cruft at the beginning of the string, so people that put
;; in extraneous '..' because they are morons won't lose.
(while (string-match "^/\\.\\.\\(/\\)" new)
(setq new (substring new (match-beginning 1) nil)))
(defun url-expand-file-name (url &optional default)
"Convert URL to a fully specified URL, and canonicalize it.
Second arg DEFAULT is a URL to start with if URL is relative.
If DEFAULT is nil or missing, the current buffer's URL is used.
Path components that are `.' are removed, and
path components followed by `..' are removed, along with the `..' itself."
(if (and url (not (string-match "^#" url)))
;; Need to nuke newlines and spaces in the URL, or we open
;; ourselves up to potential security holes.
(setq url (mapconcat (function (lambda (x)
(if (memq x '(? ?\n ?\r))
(char-to-string x))))
url "")))
;; Need to figure out how/where to expand the fragment relative to
(setq default (cond
((vectorp default)
;; Default URL has already been parsed
;; They gave us a default URL in non-parsed format
(url-generic-parse-url default))
;; We are in a URL-based buffer, use the pre-parsed object
((string-match url-nonrelative-link url)
;; The URL they gave us is absolute, go for it.
;; Hmmm - this shouldn't ever happen.
(error "url-expand-file-name confused - no default?"))))
((= (length url) 0) ; nil or empty string
(url-recreate-url default))
((string-match "^#" url) ; Offset link, use it raw
((string-match url-nonrelative-link url) ; Fully-qualified URL, return it immediately
(let* ((urlobj (url-generic-parse-url url))
(inhibit-file-name-handlers t)
(expander (url-scheme-get-property (url-type default) 'expand-file-name)))
(if (string-match "^//" url)
(setq urlobj (url-generic-parse-url (concat (url-type default) ":"
(funcall expander urlobj default)
(url-recreate-url urlobj)))))
(defun url-identity-expander (urlobj defobj)
(url-set-type urlobj (or (url-type urlobj) (url-type defobj))))
(defun url-default-expander (urlobj defobj)
;; The default expansion routine - urlobj is modified by side effect!
(if (url-type urlobj)
;; Well, they told us the scheme, let's just go with it.
(url-set-type urlobj (or (url-type urlobj) (url-type defobj)))
(url-set-port urlobj (or (url-port urlobj)
(and (string= (url-type urlobj)
(url-type defobj))
(url-port defobj))))
(if (not (string= "file" (url-type urlobj)))
(url-set-host urlobj (or (url-host urlobj) (url-host defobj))))
(if (string= "ftp" (url-type urlobj))
(url-set-user urlobj (or (url-user urlobj) (url-user defobj))))
(if (string= (url-filename urlobj) "")
(url-set-filename urlobj "/"))
(if (string-match "^/" (url-filename urlobj))
(let ((query nil)
(file nil)
(sepchar nil))
(if (string-match "[?#]" (url-filename urlobj))
(setq query (substring (url-filename urlobj) (match-end 0))
file (substring (url-filename urlobj) 0 (match-beginning 0))
sepchar (substring (url-filename urlobj) (match-beginning 0) (match-end 0)))
(setq file (url-filename urlobj)))
(setq file (url-expander-remove-relative-links
(concat (url-basepath (url-filename defobj)) file)))
(url-set-filename urlobj (if query (concat file sepchar query) file))))))
(provide 'url-expand)