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;;; emms-url.el --- Make URL and EMMS work together well
;; Copyright (C) 2006, 2007 Free Software Foundation, Inc.
;; This file is part of EMMS.
;; EMMS 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 3, or (at your option)
;; any later version.
;;
;; EMMS is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with EMMS; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; These routines sanify input to URL and parse data returned by URL.
;;; Code:
(require 'url)
(require 'emms-compat)
(defvar emms-url-specials-entire
'((?\ . "%20")
(?\n . "%0D%0A"))
"*An alist of characters which must be represented specially in URLs.
The transformation is the key of the pair.
This is used by `emms-url-quote-entire'.")
(defun emms-url-quote-entire (url)
"Escape specials conservatively in an entire URL.
The specials to escape are specified by the `emms-url-specials-entire'
variable.
If you want to escape parts of URLs thoroughly, then use
`emms-url-quote' instead."
(apply (function concat)
(mapcar
(lambda (ch)
(let ((repl (assoc ch emms-url-specials-entire)))
(if (null repl)
(char-to-string ch)
(cdr repl))))
(append url nil))))
(defun emms-url-quote (s &optional safe)
"Replace special characters in S using the `%xx' escape.
This is useful for escaping parts of URLs, but not entire URLs.
Characters in [a-zA-Z_.-/] and SAFE(default is \"\") will never be
quoted.
e.g.,
(emms-url-quote \"abc def\") => \"abc%20def\"."
(if (not (stringp s))
""
(or safe (setq safe ""))
(save-match-data
(let ((re (if (string-match "]" safe)
;; `]' should be placed at the beginning inside []
(format "[]a-zA-Z_.-/%s]"
(emms-replace-regexp-in-string "]" "" safe))
(format "[a-zA-Z_.-/%s]" safe))))
(mapconcat
(lambda (c)
(let ((s1 (char-to-string c)))
(if (string-match re s1)
s1
(format "%%%02x" c))))
(string-to-list (encode-coding-string s 'utf-8))
"")))))
(defun emms-url-quote-plus (s &optional safe)
"Run (emms-url-quote s \" \"), then replace ` ' with `+'."
(emms-replace-regexp-in-string
" " "+" (emms-url-quote s (concat safe " "))))
(defun emms-http-content-coding ()
(save-match-data
(and (boundp 'url-http-content-type)
(stringp url-http-content-type)
(string-match ";\\s-*charset=\\([^;[:space:]]+\\)"
url-http-content-type)
(intern-soft (downcase (match-string 1 url-http-content-type))))))
(defun emms-http-decode-buffer (&optional buffer)
"Recode the buffer with `url-retrieve's contents. Else the
buffer would contain multibyte chars like \\123\\456."
(with-current-buffer (or buffer (current-buffer))
(let* ((default (or (car default-process-coding-system) 'utf-8))
(coding (or (emms-http-content-coding) default)))
(when coding
;; (pop-to-buffer (current-buffer))
;; (message "content-type: %s" url-http-content-type)
;; (message "coding: %S [default: %S]" coding default)
(set-buffer-multibyte t)
(decode-coding-region (point-min) (point-max) coding)))))
(provide 'emms-url)
;;; emms-url.el ends here
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