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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Feedview for Firefox.
*
* The Initial Developer of the Original Code is
* Tom Germeau <tom.germeau@epigoon.com>.
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Ben Goodger <ben@mozilla.org>
* Myk Melez <myk@mozilla.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
var FeedView = {
/**
* Converts a W3C-DTF (subset of ISO 8601) date string to an IETF date string.
* @param dateString
* A string that may contain a W3C-DTF date string
* @returns an IETF date string
*/
_W3CToIETFDate: function(dateString) {
// W3C-DTF is described in this note: http://www.w3.org/TR/NOTE-datetime
// IETF is obtained via the Date object's toUTCString() method. The object's
// toString() method is insufficient because it spells out timezones on Win32
// (f.e. "Pacific Standard Time" instead of "PST"), which Mail doesn't grok.
// For info, see http://lxr.mozilla.org/mozilla/source/js/src/jsdate.c#1654.
const HOURS_TO_MINUTES = 60;
const MINUTES_TO_SECONDS = 60;
const SECONDS_TO_MILLISECONDS = 1000;
const MINUTES_TO_MILLISECONDS = MINUTES_TO_SECONDS * SECONDS_TO_MILLISECONDS;
const HOURS_TO_MILLISECONDS = HOURS_TO_MINUTES * MINUTES_TO_MILLISECONDS;
var parts = dateString.match(/(\d\d\d\d)(-(\d\d))?(-(\d\d))?(T(\d\d):(\d\d)(:(\d\d)(\.(\d+))?)?(Z|([+-])(\d\d):(\d\d))?)?/);
// Here's an example of a W3C-DTF date string and what .match returns for it.
// date: 2003-05-30T11:18:50.345-08:00
// date.match returns array values:
// 0: 2003-05-30T11:18:50-08:00,
// 1: 2003,
// 2: -05,
// 3: 05,
// 4: -30,
// 5: 30,
// 6: T11:18:50-08:00,
// 7: 11,
// 8: 18,
// 9: :50,
// 10: 50,
// 11: .345,
// 12: 345,
// 13: -08:00,
// 14: -,
// 15: 08,
// 16: 00
// Create a Date object from the date parts. Note that the Date object
// apparently can't deal with empty string parameters in lieu of numbers,
// so optional values (like hours, minutes, seconds, and milliseconds)
// must be forced to be numbers.
var date = new Date(parts[1], parts[3]-1, parts[5], parts[7] || 0,
parts[8] || 0, parts[10] || 0, parts[12] || 0);
// We now have a value that the Date object thinks is in the local timezone
// but which actually represents the date/time in the remote timezone
// (f.e. the value was "10:00 EST", and we have converted it to "10:00 PST"
// instead of "07:00 PST"). We need to correct that. To do so, we're going
// to add the offset between the remote timezone and UTC (to convert the value
// to UTC), then add the offset between UTC and the local timezone (to convert
// the value to the local timezone).
// Ironically, W3C-DTF gives us the offset between UTC and the remote timezone
// rather than the other way around, while the getTimezoneOffset() method
// of a Date object gives us the offset between the local timezone and UTC
// rather than the other way around. Both of these are the additive inverse
// (i.e. -x for x) of what we want, so we have to invert them to use them
// by multipying by -1
// (f.e. if "the offset between UTC and the remote timezone" is -5 hours,
// then "the offset between the remote timezone and UTC" is -5*-1 = 5 hours).
// Note that if the timezone portion of the date/time string is absent
// (which violates W3C-DTF, although ISO 8601 allows it), we assume the value
// to be in UTC.
// The offset between the remote timezone and UTC in milliseconds.
var remoteToUTCOffset = 0;
if (parts[13] && parts[13] != "Z") {
var direction = (parts[14] == "+" ? 1 : -1);
if (parts[15])
remoteToUTCOffset += direction * parts[15] * HOURS_TO_MILLISECONDS;
if (parts[16])
remoteToUTCOffset += direction * parts[16] * MINUTES_TO_MILLISECONDS;
}
remoteToUTCOffset = remoteToUTCOffset * -1; // invert it
// The offset between UTC and the local timezone in milliseconds.
var UTCToLocalOffset = date.getTimezoneOffset() * MINUTES_TO_MILLISECONDS;
UTCToLocalOffset = UTCToLocalOffset * -1; // invert it
date.setTime(date.getTime() + remoteToUTCOffset + UTCToLocalOffset);
return date.toUTCString();
},
/**
* Normalizes date strings embedded in the feed into a common format.
*/
_initializeDates: function() {
// Normalize date formatting for all feed entries
var divs = document.getElementsByTagName("div");
for (var i = 0; i < divs.length; i++) {
var d = divs[i].getAttribute("date");
dump("*** D = " + d + "\n");
if (d) {
// If the date looks like it's in W3C-DTF format, convert it into
// an IETF standard date string.
if (d.search(/^\d\d\d\d/) != -1)
d = this._W3CToIETFDate(d);
d = new Date(d);
// If the date could be parsed...
if (d instanceof Date) {
// XXX It would be nicer to say day = "Today" or "Yesterday".
var day = d.toGMTString();
day = day.substring(0, 11);
function padZeros(num) {
return num < 10 ? "0" + num : num;
}
divs[i].getElementsByTagName("span")[0].textContent =
day + " @ " + padZeros(d.getHours()) + ":" + padZeros(d.getMinutes());
}
}
}
},
/**
* Returns the value of a boolean preference
* @param name
* The name of the preference
* @returns The value of the preference
*/
_getBooleanPref: function(name) {
return document.getElementById("data").getAttribute(name) == "true";
},
/**
* Returns the value of an integer preference
* @param name
* The name of the preference
* @returns The value of the preference
*/
_getIntegerPref: function(name) {
return parseInt(document.getElementById("data").getAttribute(name));
},
/**
* Reload the page after an interval
*/
reload: function() {
location.reload();
},
/**
* Initialize the feed view
*/
init: function() {
// Hide the menu if the user chose to have it closed
if (!this._getBooleanPref("showmenu"))
document.getElementById("menubox").style.display = "none";
// Normalize the date formats
this._initializeDates();
// Set up the auto-reload timer.
// The timer loads every browser.feedview.reloadInterval minutes.
// It is disabled if the value of that preference is 0.
var reloadInterval = this._getIntegerPref("reloadinterval") || 0;
if (reloadInterval > 0)
setTimeout("FeedView.reload()", reloadInterval * 60 * 1000);
}
};
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