python/test_module_foo.py

#!/usr/bin/env python

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"""Auxiliary module for testing flags.py.

The purpose of this module is to define a few flags, and declare some
other flags as being important.  We want to make sure the unit tests
for flags.py involve more than one module.
"""

__author__ = 'Alex Salcianu'

__pychecker__ = "no-local" # for unittest

# We use the name 'flags' internally in this test, for historical reasons.
# Don't do this yourself! :-) Just do 'import gflags; FLAGS=gflags.FLAGS; etc'
import gflags as flags
FLAGS = flags.FLAGS

# For historical reasons we use the name module_bar instead of test_module_bar.
import test_module_bar as module_bar

DECLARED_KEY_FLAGS = ['tmod_bar_x', 'tmod_bar_z', 'tmod_bar_t']


def DefineFlags():
  """Defines a few flags."""
  module_bar.DefineFlags()
  # The 'tmod_foo_' prefix (short for 'test_module_foo') ensures that we
  # have no name clash with existing flags.
  flags.DEFINE_boolean('tmod_foo_bool', True, 'Boolean flag from module foo.')
  flags.DEFINE_string('tmod_foo_str', 'default', 'String flag.')
  flags.DEFINE_integer('tmod_foo_int', 3, 'Sample int flag.')


def DeclareKeyFlags():
  """Declares a few key flags."""
  for flag_name in DECLARED_KEY_FLAGS:
    flags.DECLARE_key_flag(flag_name)


def DeclareExtraKeyFlags():
  """Declares some extra key flags."""
  flags.ADOPT_module_key_flags(module_bar)


def NamesOfDefinedFlags():
  """Returns: list of names of flags defined by this module."""
  return ['tmod_foo_bool', 'tmod_foo_str', 'tmod_foo_int']


def NamesOfDeclaredKeyFlags():
  """Returns: list of names of key flags for this module."""
  return NamesOfDefinedFlags() + DECLARED_KEY_FLAGS


def NamesOfDeclaredExtraKeyFlags():
  """Returns the list of names of additional key flags for this module.

  These are the flags that became key for this module only as a result
  of a call to DeclareExtraKeyFlags() above.  I.e., the flags declared
  by module_bar, that were not already declared as key for this
  module.

  Returns:
    The list of names of additional key flags for this module.
  """
  names_of_extra_key_flags = list(module_bar.NamesOfDefinedFlags())
  for flag_name in NamesOfDeclaredKeyFlags():
    while flag_name in names_of_extra_key_flags:
      names_of_extra_key_flags.remove(flag_name)
  return names_of_extra_key_flags


def RemoveFlags():
  """Deletes the flag definitions done by the above DefineFlags()."""
  for flag_name in NamesOfDefinedFlags():
    module_bar.RemoveOneFlag(flag_name)
  module_bar.RemoveFlags()


def GetModuleName():
  """Uses flags._GetCallingModule() to return the name of this module.

  For checking that _GetCallingModule works as expected.

  Returns:
    A string, the name of this module.
  """
  # Calling the protected _GetCallingModule generates a lint warning,
  # but we do not have any other alternative to test that function.
  return flags._GetCallingModule()