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;;; w3m-rss.el --- RSS functions
;; Copyright (C) 2004, 2005 TSUCHIYA Masatoshi <tsuchiya@namazu.org>
;; Authors: TSUCHIYA Masatoshi <tsuchiya@namazu.org>
;; Keywords: w3m, WWW, hypermedia
;; This file is a part of emacs-w3m.
;; This program 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.
;; This program 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 this program; if not, you can either send email to this
;; program's maintainer or write to: The Free Software Foundation,
;; Inc.; 59 Temple Place, Suite 330; Boston, MA 02111-1307, USA.
;;; Commentary:
;; w3m-rss.el provides RSS-related functions for emacs-w3m. For more
;; detail about emacs-w3m, see:
;;
;; http://emacs-w3m.namazu.org/
;;; Acknowledgment:
;; I refered functions in `sb-rss.el' to implement this module.
;; Thanks to Koichiro Ohba and NAKAJIMA Mikio.
;;; Code:
(eval-when-compile (require 'cl))
(autoload 'xml-parse-region "xml")
(eval-and-compile
(autoload 'timezone-parse-date "timezone")
(autoload 'timezone-parse-time "timezone"))
(eval-when-compile
;; Avoid warning for Emacs 19 and XEmacs.
(unless (fboundp 'match-string-no-properties)
(autoload 'match-string-no-properties "poe"))
;; Avoid warning for Emacs 19.
(unless (fboundp 'split-string)
(autoload 'split-string "poe")))
(defun w3m-rss-parse-date-string (date)
"Decode DATE string written in the ISO 8601 format or the RFC822 style.
Return a list of numbers which conforms to the Emacs internal format.
Valid types in the ISO 8601 format include:
Year:
YYYY (eg 1997)
Year and month:
YYYY-MM (eg 1997-07)
Complete date:
YYYY-MM-DD (eg 1997-07-16)
Complete date plus hours and minutes:
YYYY-MM-DDThh:mmTZD (eg 1997-07-16T19:20+01:00)
Complete date plus hours, minutes and seconds:
YYYY-MM-DDThh:mm:ssTZD (eg 1997-07-16T19:20:30+01:00)
Complete date plus hours, minutes, seconds and a decimal fraction
of a second
YYYY-MM-DDThh:mm:ss.sTZD (eg 1997-07-16T19:20:30.45+01:00)
where:
YYYY = four-digit year
MM = two-digit month (01=January, etc.)
DD = two-digit day of month (01 through 31)
hh = two digits of hour (00 through 23) (am/pm NOT allowed)
mm = two digits of minute (00 through 59)
ss = two digits of second (00 through 59)
s = one or more digits representing a decimal fraction of a second
TZD = time zone designator (Z or +hh:mm or -hh:mm)
For more detail about ISO 8601 date format, see
<URL:http://www.w3.org/TR/NOTE-datetime>.
In addition to the above, it also supports the date format in the
RFC822 style which RSS 2.0 allows. Valid types are the same as ones
which are supported by the `timezone-parse-date' function (which see)."
(cond ((not date) nil)
((string-match " [0-9]+ " date)
(let* ((vector (timezone-parse-date date))
(year (string-to-number (aref vector 0)))
time)
(when (>= year 1970)
(setq time (timezone-parse-time (aref vector 3)))
(encode-time
(string-to-number (aref time 2))
(string-to-number (aref time 1))
(string-to-number (aref time 0))
(string-to-number (aref vector 2))
(string-to-number (aref vector 1))
year
(aref vector 4)))))
((string-match "\
\\([0-9][0-9][0-9][0-9]\\)\\(-\\([0-9][0-9]\\)\\)?\\(-\\([0-9][0-9]\\)\\)?\
T?\\(\\([0-9][0-9]\\):\\([0-9][0-9]\\)\\(:\\([.0-9]+\\)\\)?\\)?\
\\(\\([-+]\\)\\([0-9][0-9]\\):?\\([0-9][0-9]\\)\\|Z\\)?"
date)
(labels ((substr (n default)
(if (match-beginning n)
(string-to-number
(match-string-no-properties n date))
default)))
(encode-time
(substr 10 0) ;; seconds
(substr 8 0) ;; minitue
(substr 7 0) ;; hour
(substr 5 1) ;; day
(substr 3 1) ;; month
(substr 1 0) ;; year
(if (match-beginning 12)
(funcall (intern (match-string-no-properties 12 date))
0
(* 3600 (substr 13 0))
(* 60 (substr 14 0)))
0))))))
(defun w3m-rss-find-el (tag data)
"Find the all matching elements in the data. Careful with this on
large documents!"
(let (found)
(when (listp data)
(dolist (bit data)
(when (car-safe bit)
(when (equal tag (car bit))
(setq found (nconc found (list bit))))
(setq found
(nconc found
(w3m-rss-find-el
tag
(if (and (listp (car-safe (caddr bit)))
(not (stringp (caddr bit))))
(caddr bit)
(cddr bit))))))))
found))
(defun w3m-rss-get-namespace-prefix (el uri)
"Given EL (containing a parsed element) and URI (containing a string
that gives the URI for which you want to retrieve the namespace
prefix), return the prefix.
See http://feeds.archive.org/validator/docs/howto/declare_namespaces.html
for more RSS namespaces."
(let* ((prefix (car (rassoc uri (cadar el))))
(nslist (when prefix
(split-string (symbol-name prefix) ":")))
(ns (cond ((eq (length nslist) 1) ; no prefix given
"")
((eq (length nslist) 2) ; extract prefix
(cadr nslist)))))
(if (and ns (not (equal ns "")))
(concat ns ":")
ns)))
(provide 'w3m-rss)
;;; w3m-rss.el ends here
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