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docstrings.py
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docstrings.py
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# https://github.com/openstack/rally/blob/master/rally/common/plugin/info.py
# Copyright 2015: Mirantis 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.
import re
import sys
__all__ = ['parse_docstring']
FIELDS = 'param|val' # supported fields
PARAM_OR_RETURN_REGEX = re.compile(f":(?:{FIELDS}|return)")
RETURN_REGEX = re.compile(":return: (?P<doc>.*)", re.S)
NEW_REGEX = re.compile(f":(?P<field>{FIELDS}) (?P<name>[\*\w]+): (?P<doc>.*?)"
f"(?:(?=:(?:{FIELDS}|return|raises))|\Z)", re.S)
def trim(docstring):
"""trim function from PEP-257"""
if not docstring:
return ""
# Convert tabs to spaces (following the normal Python rules)
# and split into a list of lines:
lines = docstring.expandtabs().splitlines()
# Determine minimum indentation (first line doesn't count):
indent = sys.maxsize
for line in lines[1:]:
stripped = line.lstrip()
if stripped:
indent = min(indent, len(line) - len(stripped))
# Remove indentation (first line is special):
trimmed = [lines[0].strip()]
if indent < sys.maxsize:
for line in lines[1:]:
trimmed.append(line[indent:].rstrip())
# Strip off trailing and leading blank lines:
while trimmed and not trimmed[-1]:
trimmed.pop()
while trimmed and not trimmed[0]:
trimmed.pop(0)
# Current code/unittests expects a line return at
# end of multiline docstrings
# workaround expected behavior from unittests
if "\n" in docstring:
trimmed.append("")
# Return a single string:
return "\n".join(trimmed)
def reindent(string):
return "\n".join(l.strip() for l in string.strip().split("\n"))
def parse_docstring(docstring):
"""Parse the docstring into its components.
:return: a dictionary of form
{
"short_description": ...,
"long_description": ...,
"params": [{"name": ..., "doc": ...}, ...],
"vals": [{"name": ..., "doc": ...}, ...],
"return": ...
}
"""
short_description = long_description = return_str = ""
args = []
if docstring:
docstring = trim(docstring.lstrip("\n"))
lines = docstring.split("\n", 1)
short_description = lines[0]
if len(lines) > 1:
long_description = lines[1].strip()
params_return_desc = None
match = PARAM_OR_RETURN_REGEX.search(long_description)
if match:
long_desc_end = match.start()
params_return_desc = long_description[long_desc_end:].strip()
long_description = long_description[:long_desc_end].rstrip()
if params_return_desc:
args = [
{"name": name, "doc": trim(doc), "field": field}
for field, name, doc in NEW_REGEX.findall(params_return_desc)
]
match = RETURN_REGEX.search(params_return_desc)
if match:
return_str = reindent(match.group("doc"))
comments = {p['name']: p['doc'] for p in args}
return {
"short_description": short_description,
"long_description": long_description,
"args": args,
"comments": comments,
"return": return_str
}
class InfoMixin(object):
@classmethod
def _get_doc(cls):
"""Return documentary of class
By default it returns docstring of class, but it can be overridden
for example for cases like merging own docstring with parent
"""
return cls.__doc__
@classmethod
def get_info(cls):
doc = parse_docstring(cls._get_doc())
return {
"name": cls.get_name(),
"platform": cls.get_platform(),
"module": cls.__module__,
"title": doc["short_description"],
"description": doc["long_description"],
"parameters": doc["params"],
"schema": getattr(cls, "CONFIG_SCHEMA", None),
"return": doc["return"]
}