Add infra_libs as a bootstrap dependency.

infra_libs/time_functions/parser.py

-# Copyright 2016 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-"""Utility functions to parse time/duration arguments."""
-
-
-import argparse
-import datetime
-import re
-
-
-_TIMEDELTA_CONV = {
-  'us': datetime.timedelta(microseconds=1),
-  'ms': datetime.timedelta(milliseconds=1),
-  's': datetime.timedelta(seconds=1),
-  'm': datetime.timedelta(minutes=1),
-  'h': datetime.timedelta(hours=1),
-  'd': datetime.timedelta(days=1),
-}
-_TIMEDELTA_RE = re.compile(r'(\d+)(\w+)')
-
-
-def parse_timedelta(v):
-  """Returns (datetime.timedelta) The parsed timedelta.
-
-  Args:
-    v (str): The time delta string, a comma-delimited set of <count><unit>
-        tokens comprising the timedelta (e.g., 10d,2h is 10 days, 2 hours).
-
-  Raises:
-    ValueError: If parsing failed.
-  """
-  result = datetime.timedelta()
-  for comp in v.split(','):
-    match = _TIMEDELTA_RE.match(comp)
-    if match is None:
-      raise ValueError('Invalid timedelta token (%s)' % (comp,))
-    count, unit = int(match.group(1)), match.group(2)
-    unit_value = _TIMEDELTA_CONV.get(unit)
-    if unit_value is None:
-      raise ValueError('Invalid timedelta token unit (%s)' % (unit,))
-    result += (unit_value * count)
-  return result
-
-
-def argparse_timedelta_type(v):
-  """Returns (datetime.timedelta) The parsed timedelta.
-
-  This is an argparse-compatible version of `parse_timedelta` that raises an
-  argparse.ArgumentTypeError on failure instead of a ValueError.
-
-  Raises:
-    argparse.ArgumentTypeError: If parsing failed.
-  """
-  try:
-    return parse_timedelta(v)
-  except ValueError as e:
-    raise argparse.ArgumentTypeError(e.message)