| # 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. |
| |
| """ |
| Provides patches for some commonly used modules that enable them to work |
| with pyfakefs. |
| """ |
| import sys |
| |
| try: |
| import pandas.io.parsers as parsers |
| except ImportError: |
| parsers = None |
| |
| try: |
| import xlrd |
| except ImportError: |
| xlrd = None |
| |
| try: |
| from django.core.files import locks |
| except ImportError: |
| locks = None |
| |
| |
| def get_modules_to_patch(): |
| modules_to_patch = {} |
| if xlrd is not None: |
| modules_to_patch['xlrd'] = XLRDModule |
| if locks is not None: |
| modules_to_patch['django.core.files.locks'] = FakeLocks |
| return modules_to_patch |
| |
| |
| def get_classes_to_patch(): |
| classes_to_patch = {} |
| if parsers is not None: |
| classes_to_patch[ |
| 'TextFileReader' |
| ] = 'pandas.io.parsers' |
| return classes_to_patch |
| |
| |
| def get_fake_module_classes(): |
| fake_module_classes = {} |
| if parsers is not None: |
| fake_module_classes[ |
| 'TextFileReader' |
| ] = FakeTextFileReader |
| return fake_module_classes |
| |
| |
| if xlrd is not None: |
| class XLRDModule: |
| """Patches the xlrd module, which is used as the default Excel file |
| reader by pandas. Disables using memory mapped files, which are |
| implemented platform-specific on OS level.""" |
| |
| def __init__(self, _): |
| self._xlrd_module = xlrd |
| |
| def open_workbook(self, filename=None, |
| logfile=sys.stdout, |
| verbosity=0, |
| use_mmap=False, |
| file_contents=None, |
| encoding_override=None, |
| formatting_info=False, |
| on_demand=False, |
| ragged_rows=False): |
| return self._xlrd_module.open_workbook( |
| filename, logfile, verbosity, False, file_contents, |
| encoding_override, formatting_info, on_demand, ragged_rows) |
| |
| def __getattr__(self, name): |
| """Forwards any unfaked calls to the standard xlrd module.""" |
| return getattr(self._xlrd_module, name) |
| |
| if parsers is not None: |
| # we currently need to add fake modules for both the parser module and |
| # the contained text reader - maybe this can be simplified |
| |
| class FakeTextFileReader: |
| fake_parsers = None |
| |
| def __init__(self, filesystem): |
| if self.fake_parsers is None: |
| self.__class__.fake_parsers = ParsersModule(filesystem) |
| |
| def __call__(self, *args, **kwargs): |
| return self.fake_parsers.TextFileReader(*args, **kwargs) |
| |
| def __getattr__(self, name): |
| return getattr(self.fake_parsers.TextFileReader, name) |
| |
| class ParsersModule: |
| def __init__(self, _): |
| self._parsers_module = parsers |
| |
| class TextFileReader(parsers.TextFileReader): |
| def __init__(self, *args, **kwargs): |
| kwargs['engine'] = 'python' |
| super().__init__(*args, **kwargs) |
| |
| def __getattr__(self, name): |
| """Forwards any unfaked calls to the standard xlrd module.""" |
| return getattr(self._parsers_module, name) |
| |
| if locks is not None: |
| class FakeLocks: |
| """django.core.files.locks uses low level OS functions, fake it.""" |
| _locks_module = locks |
| |
| def __init__(self, _): |
| pass |
| |
| @staticmethod |
| def lock(f, flags): |
| return True |
| |
| @staticmethod |
| def unlock(f): |
| return True |
| |
| def __getattr__(self, name): |
| return getattr(self._locks_module, name) |