Change intl to use new pub layout

pkg/intl/lib/date_format_helpers.dart

-// Copyright (c) 2012, 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.
-
-/**
- * A class for holding onto the data for a date so that it can be built
- * up incrementally.
- */
-class _DateBuilder {
-  // Default the date values to the EPOCH so that there's a valid date
-  // in case the format doesn't set them.
-  int year = 1970,
-      month = 1,
-      day = 1,
-      hour = 0,
-      minute = 0,
-      second = 0,
-      fractionalSecond = 0;
-  bool pm = false;
-  bool utc = false;
-
-  // Functions that exist just to be closurized so we can pass them to a general
-  // method.
-  void setYear(x) { year = x; }
-  void setMonth(x) { month = x; }
-  void setDay(x) { day = x; }
-  void setHour(x) { hour = x; }
-  void setMinute(x) { minute = x; }
-  void setSecond(x) { second = x; }
-  void setFractionalSecond(x) { fractionalSecond = x; }
-
-  /**
-   * Return a date built using our values. If no date portion is set,
-   * use the "Epoch" of January 1, 1970.
-   */
-  Date asDate() {
-    // TODO(alanknight): Validate the date, especially for things which
-    // can crash the VM, e.g. large month values.
-    return new Date(
-        year,
-        month,
-        day,
-        pm ? hour + 12 : hour,
-        minute,
-        second,
-        fractionalSecond,
-        utc);
-  }
-}
-
-/**
- * A simple and not particularly general stream class to make parsing
- * dates from strings simpler. It is general enough to operate on either
- * lists or strings.
- */
-class _Stream {
-  var contents;
-  int index = 0;
-
-  _Stream(this.contents);
-
-  bool atEnd() => index >= contents.length;
-
-  Dynamic next() => contents[index++];
-
-  /**
-   * Return the next [howMany] items, or as many as there are remaining.
-   * Advance the stream by that many positions.
-   */
-  read([howMany = 1]) {
-    var result = peek(howMany);
-    index += howMany;
-    return result;
-  }
-
-  /**
-   * Return the next [howMany] items, or as many as there are remaining.
-   * Does not modify the stream position.
-   */
-  peek([howMany = 1]) {
-    var result;
-    if (contents is String) {
-      result = contents.substring(
-          index,
-          min(index + howMany, contents.length));
-    } else {
-      // Assume List
-      result = contents.getRange(index, howMany);
-    }
-    return result;
-  }
-
-  /** Return the remaining contents of the stream */
-  rest() => peek(contents.length - index);
-
-  /**
-   * Find the index of the first element for which [f] returns true.
-   * Advances the stream to that position.
-   */
-  int findIndex(Function f) {
-    while (!atEnd()) {
-      if (f(next())) return index - 1;
-    }
-    return null;
-  }
-
-  /**
-   * Find the indexes of all the elements for which [f] returns true.
-   * Leaves the stream positioned at the end.
-   */
-  List findIndexes(Function f) {
-    var results = [];
-    while (!atEnd()) {
-      if (f(next())) results.add(index - 1);
-    }
-    return results;
-  }
-
-  /**
-   * Assuming that the contents are characters, read as many digits as we
-   * can see and then return the corresponding integer. Advance the stream.
-   */
-  var digitMatcher = const RegExp(@'\d+');
-  int nextInteger() {
-    var string = digitMatcher.stringMatch(rest());
-    if (string == null || string.isEmpty()) return null;
-    read(string.length);
-    return int.parse(string);
-  }
-}