Move client/{base, observable, layout, touch, util, view} to samples/ui_lib .

client/util/DateUtils.dart

Index: client/util/DateUtils.dart
===================================================================
--- client/util/DateUtils.dart	(revision 4144)
+++ client/util/DateUtils.dart	(working copy)
@@ -1,185 +0,0 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-/**
- * General purpose date/time utilities.
- */
-class DateUtils {
-  // TODO(jmesserly): localized strings
-  static final WEEKDAYS = const ['Monday', 'Tuesday', 'Wednesday', 'Thursday',
-                                 'Friday', 'Saturday', 'Sunday'];
-
-  static final YESTERDAY = 'Yesterday';
-
-  static final MS_IN_WEEK = Date.DAYS_IN_WEEK * Duration.MILLISECONDS_PER_DAY;
-
-  // TODO(jmesserly): workaround for missing Date.fromDate in Dartium
-  // Remove this once that is implemented. See b/5055106
-  // Parse a string like: "Mon, 27 Jun 2011 15:22:00 -0700"
-  static Date fromString(String text) {
-    final parts = text.split(' ');
-    if (parts.length == 1) {
-      return _parseIsoDate(text);
-    }
-
-    if (parts.length != 6) {
-      throw 'bad date format, expected 6 parts: ' + text;
-    }
-
-    // skip parts[0], the weekday
-
-    int day = Math.parseInt(parts[1]);
-
-    final months = const['Jan', 'Feb', 'Mar', 'Apr',
-                         'May', 'Jun', 'Jul', 'Aug',
-                         'Sep', 'Oct', 'Nov', 'Dec'];
-    int month = months.indexOf(parts[2], 0) + 1;
-    if (month < 0) {
-      throw 'bad month, expected 3 letter month code, got: ' + parts[2];
-    }
-
-    int year = Math.parseInt(parts[3]);
-
-    final timeParts = parts[4].split(':');
-    if (timeParts.length != 3) {
-      throw 'bad time format, expected 3 parts: ' + parts[4];
-    }
-
-    int hours = Math.parseInt(timeParts[0]);
-    int minutes = Math.parseInt(timeParts[1]);
-    int seconds = Math.parseInt(timeParts[2]);
-
-    // TODO(jmesserly): TimeZone is not implemented in Dartium. This ugly
-    // hack applies the timezone from the string to the final time
-    int zoneOffset = Math.parseInt(parts[5]) ~/ 100;
-
-    // Pretend it's a UTC time
-    Date result = new Date.withTimeZone(
-        year, month, day, hours, minutes, seconds, 0, new TimeZone.utc());
-    // Shift it to the proper zone, but it's still a UTC time
-    result = result.subtract(new Duration(hours: zoneOffset));
-    // Then render it as a local time
-    return result.changeTimeZone(new TimeZone.local());
-  }
-
-  /** Parse a string like: 2011-07-19T22:03:04.000Z */
-  // TODO(jmesserly): workaround for Date.fromDate, which has issues:
-  //   * on Dart VM it doesn't handle all of ISO 8601. See b/5055106.
-  //   * on DartC it doesn't work on Safari. See b/5062557.
-  // Remove this once that function is fully implemented
-  static Date _parseIsoDate(String text) {
-    void ensure(bool value) {
-      if (!value) {
-        throw 'bad date format, expected YYYY-MM-DDTHH:MM:SS.mmmZ: ' + text;
-      }
-    }
-
-    TimeZone zone;
-    if (text.endsWith('Z')) {
-      text = text.substring(0, text.length - 1);
-      zone = new TimeZone.utc();
-    } else {
-      zone = new TimeZone.local();
-    }
-
-    final parts = text.split('T');
-    ensure(parts.length == 2);
-
-    final date = parts[0].split('-');
-    ensure(date.length == 3);
-
-    final time = parts[1].split(':');
-    ensure(time.length == 3);
-
-    final seconds = time[2].split('.');
-    ensure(seconds.length >= 1 && seconds.length <= 2);
-    int milliseconds = 0;
-    if (seconds.length == 2) {
-      milliseconds = Math.parseInt(seconds[1]);
-    }
-
-    return new Date.withTimeZone(
-        Math.parseInt(date[0]),
-        Math.parseInt(date[1]),
-        Math.parseInt(date[2]),
-        Math.parseInt(time[0]),
-        Math.parseInt(time[1]),
-        Math.parseInt(seconds[0]),
-        milliseconds,
-        zone);
-  }
-
-  /**
-   * A date/time formatter that takes into account the current date/time:
-   *  - if it's from today, just show the time
-   *  - if it's from yesterday, just show 'Yesterday'
-   *  - if it's from the same week, just show the weekday
-   *  - otherwise, show just the date
-   */
-  static String toRecentTimeString(Date then) {
-    bool datesAreEqual(Date d1, Date d2) {
-      return (d1.year == d2.year) && (d1.month == d2.month) &&
-          (d1.day == d2.day);
-    }
-
-    final now = new Date.now();
-    if (datesAreEqual(then, now)) {
-      return toHourMinutesString(new Duration(
-          0, then.hours, then.minutes, then.seconds, then.milliseconds));
-    }
-
-    final today = new Date(now.year, now.month, now.day, 0, 0, 0, 0);
-    Duration delta = today.difference(then);
-    if (delta.inMilliseconds < Duration.MILLISECONDS_PER_DAY) {
-      return YESTERDAY;
-    } else if (delta.inMilliseconds < MS_IN_WEEK) {
-      return WEEKDAYS[getWeekday(then)];
-    } else {
-      // TODO(jmesserly): locale specific date format
-      String twoDigits(int n) {
-        if (n >= 10) return "${n}";
-        return "0${n}";
-      }
-      String twoDigitMonth = twoDigits(then.month);
-      String twoDigitDay = twoDigits(then.day);
-      return "${then.year}-${twoDigitMonth}-${twoDigitDay}";
-    }
-  }
-
-  // TODO(jmesserly): this is a workaround for unimplemented Date.weekday
-  // Code inspired by v8/src/date.js
-  static int getWeekday(Date dateTime) {
-    final unixTimeStart = new Date(1970, 1, 1, 0, 0, 0, 0);
-    int msSince1970 = dateTime.difference(unixTimeStart).inMilliseconds;
-    int daysSince1970 = msSince1970 ~/ Duration.MILLISECONDS_PER_DAY;
-    // 1970-1-1 was Thursday
-    return ((daysSince1970 + Date.THU) % Date.DAYS_IN_WEEK);
-  }
-
-  /** Formats a time in H:MM A format */
-  // TODO(jmesserly): should get 12 vs 24 hour clock setting from the locale
-  static String toHourMinutesString(Duration duration) {
-    assert(duration.inDays == 0);
-    int hours = duration.inHours;
-    String a;
-    if (hours >= 12) {
-      a = 'pm';
-      if (hours != 12) {
-        hours -= 12;
-      }
-    } else {
-      a = 'am';
-      if (hours == 0) {
-        hours += 12;
-      }
-    }
-    String twoDigits(int n) {
-      if (n >= 10) return "${n}";
-      return "0${n}";
-    }
-    String mm =
-        twoDigits(duration.inMinutes.remainder(Duration.MINUTES_PER_HOUR));
-    return "${hours}:${mm} ${a}";
-  }
-}