depot_tools: Remove third_party/gsutil

third_party/gsutil/gslib/plurality_checkable_iterator.py

-# Copyright 2012 Google Inc. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""
-Iterator wrapper that allows you to check whether the wrapped iterator
-is empty and whether it has more than 1 element.
-"""
-
-class PluralityCheckableIterator(object):
-
-  def __init__(self, it):
-    self.it = it.__iter__()
-    self.head = []
-    # Populate first 2 elems into head so we can check whether iterator has
-    # more than 1 item.
-    for i in range(0, 2):
-      self.__populate_head__()
-
-  def __populate_head__(self):
-    try:
-      e = self.it.next()
-      self.underlying_iter_empty = False
-      self.head.append(e)
-    except StopIteration:
-      # Indicates we can no longer call next() on underlying iterator, but
-      # there could still be elements left to iterate in head.
-      self.underlying_iter_empty = True
-
-  def __iter__(self):
-    while len(self.head) > 0:
-      yield self.next()
-    else:
-      raise StopIteration()
-
-  def next(self):
-    # Backfill into head each time we pop an element so we can always check
-    # for emptiness and for has_plurality().
-    self.__populate_head__()
-    return self.head.pop(0)
-
-  def is_empty(self):
-    return len(self.head) == 0
-
-  def has_plurality(self):
-    return len(self.head) > 1