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# Copyright 2015 Amazon.com, Inc. or its affiliates. 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. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file 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.
from botocore.docs.method import document_model_driven_method
from botocore.docs.waiter import document_wait_method
from botocore.docs.paginator import document_paginate_method
from botocore.docs.bcdoc.restdoc import DocumentStructure
class LazyLoadedDocstring(str):
"""Used for lazily loading docstrings
You can instantiate this class and assign it to a __doc__ value.
The docstring will not be generated till accessed via __doc__ or
help(). Note that all docstring classes **must** subclass from
this class. It cannot be used directly as a docstring.
"""
def __init__(self, *args, **kwargs):
"""
The args and kwargs are the same as the underlying document
generation function. These just get proxied to the underlying
function.
"""
super(LazyLoadedDocstring, self).__init__()
self._gen_args = args
self._gen_kwargs = kwargs
self._docstring = None
def __new__(cls, *args, **kwargs):
# Needed in order to sub class from str with args and kwargs
return super(LazyLoadedDocstring, cls).__new__(cls)
def _write_docstring(self, *args, **kwargs):
raise NotImplementedError(
'_write_docstring is not implemented. Please subclass from '
'this class and provide your own _write_docstring method'
)
def expandtabs(self, tabsize=8):
"""Expands tabs to spaces
So this is a big hack in order to get lazy loaded docstring work
for the ``help()``. In the ``help()`` function, ``pydoc`` and
``inspect`` are used. At some point the ``inspect.cleandoc``
method is called. To clean the docs ``expandtabs`` is called
and that is where we override the method to generate and return the
docstrings.
"""
if self._docstring is None:
self._generate()
return self._docstring.expandtabs(tabsize)
def __str__(self):
return self._generate()
# __doc__ of target will use either __repr__ or __str__ of this class.
__repr__ = __str__
def _generate(self):
# Generate the docstring if it is not already cached.
if self._docstring is None:
self._docstring = self._create_docstring()
return self._docstring
def _create_docstring(self):
docstring_structure = DocumentStructure('docstring', target='html')
# Call the document method function with the args and kwargs
# passed to the class.
self._write_docstring(
docstring_structure, *self._gen_args,
**self._gen_kwargs)
return docstring_structure.flush_structure().decode('utf-8')
class ClientMethodDocstring(LazyLoadedDocstring):
def _write_docstring(self, *args, **kwargs):
document_model_driven_method(*args, **kwargs)
class WaiterDocstring(LazyLoadedDocstring):
def _write_docstring(self, *args, **kwargs):
document_wait_method(*args, **kwargs)
class PaginatorDocstring(LazyLoadedDocstring):
def _write_docstring(self, *args, **kwargs):
document_paginate_method(*args, **kwargs)
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