The Tor Browser: js/xpconnect/loader/ISO8601DateUtils.jsm@6474c204b198 (annotated)

js/xpconnect/loader/ISO8601DateUtils.jsm@6474c204b198 (annotated)

js/xpconnect/loader/ISO8601DateUtils.jsm

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 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;
 this.EXPORTED_SYMBOLS = ["ISO8601DateUtils"];
 debug("*** loading ISO8601DateUtils\n");
 this.ISO8601DateUtils = {
   /**
   * XXX Thunderbird's W3C-DTF function
   *
   * Converts a W3C-DTF (subset of ISO 8601) date string to a Javascript
   * date object. 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#1526.
   */
   parse: function ISO8601_parse(aDateString) {
     var dateString = aDateString;
     if (!dateString.match('-')) {
       // Workaround for server sending
       // dates such as: 20030530T11:18:50-08:00
       // instead of: 2003-05-30T11:18:50-08:00
       var year = dateString.slice(0, 4);
       var month = dateString.slice(4, 6);
       var rest = dateString.slice(6, dateString.length);
       dateString = year + "-" + month + "-" + rest;
     }
     var parts = dateString.match(/(\d{4})(-(\d{2,3}))?(-(\d{2}))?(T(\d{2}):(\d{2})(:(\d{2})(\.(\d+))?)?(Z|([+-])(\d{2}):(\d{2}))?)?/);
     // 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;
   },
   create: function ISO8601_create(aDate) {
     function zeropad (s, l) {
       s = s.toString(); // force it to a string
       while (s.length < l) {
         s = '0' + s;
       }
       return s;
     }
     var myDate;
     // if d is a number, turn it into a date
     if (typeof aDate == 'number') {
       myDate = new Date()
       myDate.setTime(aDate);
     } else {
       myDate = aDate;
     }
     // YYYY-MM-DDThh:mm:ssZ
     var result = zeropad(myDate.getUTCFullYear (), 4) +
                  zeropad(myDate.getUTCMonth () + 1, 2) +
                  zeropad(myDate.getUTCDate (), 2) + 'T' +
                  zeropad(myDate.getUTCHours (), 2) + ':' +
                  zeropad(myDate.getUTCMinutes (), 2) + ':' +
                  zeropad(myDate.getUTCSeconds (), 2) + 'Z';
     return result;
   }
 }

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js/xpconnect/loader/ISO8601DateUtils.jsm@6474c204b198 (annotated)

js/xpconnect/loader/ISO8601DateUtils.jsm