Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/http_parser/lib/src/http_date.dart

+// Copyright (c) 2014, 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.
+
+library http_parser.http_date;
+
+import 'package:string_scanner/string_scanner.dart';
+
+import 'utils.dart';
+
+const _WEEKDAYS = const ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"];
+const _MONTHS = const ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
+    "Sep", "Oct", "Nov", "Dec"];
+
+final _shortWeekdayRegExp = new RegExp(r"Mon|Tue|Wed|Thu|Fri|Sat|Sun");
+final _longWeekdayRegExp =
+    new RegExp(r"Monday|Tuesday|Wednesday|Thursday|Friday|Saturday|Sunday");
+final _monthRegExp =
+    new RegExp(r"Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec");
+final _digitRegExp = new RegExp(r"\d+");
+
+/// Return a HTTP-formatted string representation of [date].
+///
+/// This follows [RFC 822](http://tools.ietf.org/html/rfc822) as updated by [RFC
+/// 1123](http://tools.ietf.org/html/rfc1123).
+String formatHttpDate(DateTime date) {
+  date = date.toUtc();
+  var buffer = new StringBuffer()
+    ..write(_WEEKDAYS[date.weekday - 1])
+    ..write(", ")
+    ..write(date.day <= 9 ? "0" : "")
+    ..write(date.day.toString())
+    ..write(" ")
+    ..write(_MONTHS[date.month - 1])
+    ..write(" ")
+    ..write(date.year.toString())
+    ..write(date.hour <= 9 ? " 0" : " ")
+    ..write(date.hour.toString())
+    ..write(date.minute <= 9 ? ":0" : ":")
+    ..write(date.minute.toString())
+    ..write(date.second <= 9 ? ":0" : ":")
+    ..write(date.second.toString())
+    ..write(" GMT");
+  return buffer.toString();
+}
+
+/// Parses an HTTP-formatted date into a UTC [DateTime].
+///
+/// This follows [RFC
+/// 2616](http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3). It will
+/// throw a [FormatException] if [date] is invalid.
+DateTime parseHttpDate(String date) {
+  return wrapFormatException("HTTP date", date, () {
+    var scanner = new StringScanner(date);
+
+    if (scanner.scan(_longWeekdayRegExp)) {
+      // RFC 850 starts with a long weekday.
+      scanner.expect(", ");
+      var day = _parseInt(scanner, 2);
+      scanner.expect("-");
+      var month = _parseMonth(scanner);
+      scanner.expect("-");
+      var year = 1900 + _parseInt(scanner, 2);
+      scanner.expect(" ");
+      var time = _parseTime(scanner);
+      scanner.expect(" GMT");
+      scanner.expectDone();
+
+      return _makeDateTime(year, month, day, time);
+    }
+
+    // RFC 1123 and asctime both start with a short weekday.
+    scanner.expect(_shortWeekdayRegExp);
+    if (scanner.scan(", ")) {
+      // RFC 1123 follows the weekday with a comma.
+      var day = _parseInt(scanner, 2);
+      scanner.expect(" ");
+      var month = _parseMonth(scanner);
+      scanner.expect(" ");
+      var year = _parseInt(scanner, 4);
+      scanner.expect(" ");
+      var time = _parseTime(scanner);
+      scanner.expect(" GMT");
+      scanner.expectDone();
+
+      return _makeDateTime(year, month, day, time);
+    }
+
+    // asctime follows the weekday with a space.
+    scanner.expect(" ");
+    var month = _parseMonth(scanner);
+    scanner.expect(" ");
+    var day = scanner.scan(" ") ? _parseInt(scanner, 1) : _parseInt(scanner, 2);
+    scanner.expect(" ");
+    var time = _parseTime(scanner);
+    scanner.expect(" ");
+    var year = _parseInt(scanner, 4);
+    scanner.expectDone();
+
+    return _makeDateTime(year, month, day, time);
+  });
+}
+
+/// Parses a short-form month name to a form accepted by [DateTime].
+int _parseMonth(StringScanner scanner) {
+  scanner.expect(_monthRegExp);
+  // DateTime uses 1-indexed months.
+  return _MONTHS.indexOf(scanner.lastMatch[0]) + 1;
+}
+
+/// Parses an int an enforces that it has exactly [digits] digits.
+int _parseInt(StringScanner scanner, int digits) {
+  scanner.expect(_digitRegExp);
+  if (scanner.lastMatch[0].length != digits) {
+    scanner.error("expected a $digits-digit number.");
+  }
+
+  return int.parse(scanner.lastMatch[0]);
+}
+
+/// Parses an timestamp of the form "HH:MM:SS" on a 24-hour clock.
+DateTime _parseTime(StringScanner scanner) {
+  var hours = _parseInt(scanner, 2);
+  if (hours >= 24) scanner.error("hours may not be greater than 24.");
+  scanner.expect(':');
+
+  var minutes = _parseInt(scanner, 2);
+  if (minutes >= 60) scanner.error("minutes may not be greater than 60.");
+  scanner.expect(':');
+
+  var seconds = _parseInt(scanner, 2);
+  if (seconds >= 60) scanner.error("seconds may not be greater than 60.");
+
+  return new DateTime(1, 1, 1, hours, minutes, seconds);
+}
+
+/// Returns a UTC [DateTime] from the given components.
+///
+/// Validates that [day] is a valid day for [month]. If it's not, throws a
+/// [FormatException].
+DateTime _makeDateTime(int year, int month, int day, DateTime time) {
+  var dateTime =
+      new DateTime.utc(year, month, day, time.hour, time.minute, time.second);
+
+  // If [day] was too large, it will cause [month] to overflow.
+  if (dateTime.month != month) {
+    throw new FormatException("invalid day '$day' for month '$month'.");
+  }
+  return dateTime;
+}