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Untriex Programming
2021-08-31 22:06:02 +02:00
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.venv/lib/python3.9/site-packages/absl/flags/_helpers.py Normal file
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# Copyright 2017 The Abseil Authors.
#
# 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.
"""Internal helper functions for Abseil Python flags library."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import collections
import os
import re
import struct
import sys
import textwrap
try:
import fcntl
except ImportError:
fcntl = None
try:
# Importing termios will fail on non-unix platforms.
import termios
except ImportError:
termios = None
import six
from six.moves import range # pylint: disable=redefined-builtin
_DEFAULT_HELP_WIDTH = 80 # Default width of help output.
_MIN_HELP_WIDTH = 40 # Minimal "sane" width of help output. We assume that any
# value below 40 is unreasonable.
# Define the allowed error rate in an input string to get suggestions.
#
# We lean towards a high threshold because we tend to be matching a phrase,
# and the simple algorithm used here is geared towards correcting word
# spellings.
#
# For manual testing, consider "<command> --list" which produced a large number
# of spurious suggestions when we used "least_errors > 0.5" instead of
# "least_erros >= 0.5".
_SUGGESTION_ERROR_RATE_THRESHOLD = 0.50
# Characters that cannot appear or are highly discouraged in an XML 1.0
# document. (See http://www.w3.org/TR/REC-xml/#charsets or
# https://en.wikipedia.org/wiki/Valid_characters_in_XML#XML_1.0)
_ILLEGAL_XML_CHARS_REGEX = re.compile(
u'[\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\x84\x86-\x9f\ud800-\udfff\ufffe\uffff]')
# This is a set of module ids for the modules that disclaim key flags.
# This module is explicitly added to this set so that we never consider it to
# define key flag.
disclaim_module_ids = set([id(sys.modules[__name__])])
# Define special flags here so that help may be generated for them.
# NOTE: Please do NOT use SPECIAL_FLAGS from outside flags module.
# Initialized inside flagvalues.py.
SPECIAL_FLAGS = None
# This points to the flags module, initialized in flags/__init__.py.
# This should only be used in adopt_module_key_flags to take SPECIAL_FLAGS into
# account.
FLAGS_MODULE = None
class _ModuleObjectAndName(
collections.namedtuple('_ModuleObjectAndName', 'module module_name')):
"""Module object and name.
Fields:
- module: object, module object.
- module_name: str, module name.
"""
def get_module_object_and_name(globals_dict):
"""Returns the module that defines a global environment, and its name.
Args:
globals_dict: A dictionary that should correspond to an environment
providing the values of the globals.
Returns:
_ModuleObjectAndName - pair of module object & module name.
Returns (None, None) if the module could not be identified.
"""
name = globals_dict.get('__name__', None)
module = sys.modules.get(name, None)
# Pick a more informative name for the main module.
return _ModuleObjectAndName(module,
(sys.argv[0] if name == '__main__' else name))
def get_calling_module_object_and_name():
"""Returns the module that's calling into this module.
We generally use this function to get the name of the module calling a
DEFINE_foo... function.
Returns:
The module object that called into this one.
Raises:
AssertionError: Raised when no calling module could be identified.
"""
for depth in range(1, sys.getrecursionlimit()):
# sys._getframe is the right thing to use here, as it's the best
# way to walk up the call stack.
globals_for_frame = sys._getframe(depth).f_globals # pylint: disable=protected-access
module, module_name = get_module_object_and_name(globals_for_frame)
if id(module) not in disclaim_module_ids and module_name is not None:
return _ModuleObjectAndName(module, module_name)
raise AssertionError('No module was found')
def get_calling_module():
"""Returns the name of the module that's calling into this module."""
return get_calling_module_object_and_name().module_name
def str_or_unicode(value):
"""Converts a value to a python string.
Behavior of this function is intentionally different in Python2/3.
In Python2, the given value is attempted to convert to a str (byte string).
If it contains non-ASCII characters, it is converted to a unicode instead.
In Python3, the given value is always converted to a str (unicode string).
This behavior reflects the (bad) practice in Python2 to try to represent
a string as str as long as it contains ASCII characters only.
Args:
value: An object to be converted to a string.
Returns:
A string representation of the given value. See the description above
for its type.
"""
try:
return str(value)
except UnicodeEncodeError:
return unicode(value) # Python3 should never come here
def create_xml_dom_element(doc, name, value):
"""Returns an XML DOM element with name and text value.
Args:
doc: minidom.Document, the DOM document it should create nodes from.
name: str, the tag of XML element.
value: object, whose string representation will be used
as the value of the XML element. Illegal or highly discouraged xml 1.0
characters are stripped.
Returns:
An instance of minidom.Element.
"""
s = str_or_unicode(value)
if six.PY2 and not isinstance(s, unicode):
# Get a valid unicode string.
s = s.decode('utf-8', 'ignore')
if isinstance(value, bool):
# Display boolean values as the C++ flag library does: no caps.
s = s.lower()
# Remove illegal xml characters.
s = _ILLEGAL_XML_CHARS_REGEX.sub(u'', s)
e = doc.createElement(name)
e.appendChild(doc.createTextNode(s))
return e
def get_help_width():
"""Returns the integer width of help lines that is used in TextWrap."""
if not sys.stdout.isatty() or termios is None or fcntl is None:
return _DEFAULT_HELP_WIDTH
try:
data = fcntl.ioctl(sys.stdout, termios.TIOCGWINSZ, '1234')
columns = struct.unpack('hh', data)[1]
# Emacs mode returns 0.
# Here we assume that any value below 40 is unreasonable.
if columns >= _MIN_HELP_WIDTH:
return columns
# Returning an int as default is fine, int(int) just return the int.
return int(os.getenv('COLUMNS', _DEFAULT_HELP_WIDTH))
except (TypeError, IOError, struct.error):
return _DEFAULT_HELP_WIDTH
def get_flag_suggestions(attempt, longopt_list):
"""Returns helpful similar matches for an invalid flag."""
# Don't suggest on very short strings, or if no longopts are specified.
if len(attempt) <= 2 or not longopt_list:
return []
option_names = [v.split('=')[0] for v in longopt_list]
# Find close approximations in flag prefixes.
# This also handles the case where the flag is spelled right but ambiguous.
distances = [(_damerau_levenshtein(attempt, option[0:len(attempt)]), option)
for option in option_names]
# t[0] is distance, and sorting by t[1] allows us to have stable output.
distances.sort()
least_errors, _ = distances[0]
# Don't suggest excessively bad matches.
if least_errors >= _SUGGESTION_ERROR_RATE_THRESHOLD * len(attempt):
return []
suggestions = []
for errors, name in distances:
if errors == least_errors:
suggestions.append(name)
else:
break
return suggestions
def _damerau_levenshtein(a, b):
"""Returns Damerau-Levenshtein edit distance from a to b."""
memo = {}
def distance(x, y):
"""Recursively defined string distance with memoization."""
if (x, y) in memo:
return memo[x, y]
if not x:
d = len(y)
elif not y:
d = len(x)
else:
d = min(
distance(x[1:], y) + 1, # correct an insertion error
distance(x, y[1:]) + 1, # correct a deletion error
distance(x[1:], y[1:]) + (x[0] != y[0])) # correct a wrong character
if len(x) >= 2 and len(y) >= 2 and x[0] == y[1] and x[1] == y[0]:
# Correct a transposition.
t = distance(x[2:], y[2:]) + 1
if d > t:
d = t
memo[x, y] = d
return d
return distance(a, b)
def text_wrap(text, length=None, indent='', firstline_indent=None):
"""Wraps a given text to a maximum line length and returns it.
It turns lines that only contain whitespace into empty lines, keeps new lines,
and expands tabs using 4 spaces.
Args:
text: str, text to wrap.
length: int, maximum length of a line, includes indentation.
If this is None then use get_help_width()
indent: str, indent for all but first line.
firstline_indent: str, indent for first line; if None, fall back to indent.
Returns:
str, the wrapped text.
Raises:
ValueError: Raised if indent or firstline_indent not shorter than length.
"""
# Get defaults where callee used None
if length is None:
length = get_help_width()
if indent is None:
indent = ''
if firstline_indent is None:
firstline_indent = indent
if len(indent) >= length:
raise ValueError('Length of indent exceeds length')
if len(firstline_indent) >= length:
raise ValueError('Length of first line indent exceeds length')
text = text.expandtabs(4)
result = []
# Create one wrapper for the first paragraph and one for subsequent
# paragraphs that does not have the initial wrapping.
wrapper = textwrap.TextWrapper(
width=length, initial_indent=firstline_indent, subsequent_indent=indent)
subsequent_wrapper = textwrap.TextWrapper(
width=length, initial_indent=indent, subsequent_indent=indent)
# textwrap does not have any special treatment for newlines. From the docs:
# "...newlines may appear in the middle of a line and cause strange output.
# For this reason, text should be split into paragraphs (using
# str.splitlines() or similar) which are wrapped separately."
for paragraph in (p.strip() for p in text.splitlines()):
if paragraph:
result.extend(wrapper.wrap(paragraph))
else:
result.append('') # Keep empty lines.
# Replace initial wrapper with wrapper for subsequent paragraphs.
wrapper = subsequent_wrapper
return '\n'.join(result)
def flag_dict_to_args(flag_map, multi_flags=None):
"""Convert a dict of values into process call parameters.
This method is used to convert a dictionary into a sequence of parameters
for a binary that parses arguments using this module.
Args:
flag_map: dict, a mapping where the keys are flag names (strings).
values are treated according to their type:
* If value is None, then only the name is emitted.
* If value is True, then only the name is emitted.
* If value is False, then only the name prepended with 'no' is emitted.
* If value is a string then --name=value is emitted.
* If value is a collection, this will emit --name=value1,value2,value3,
unless the flag name is in multi_flags, in which case this will emit
--name=value1 --name=value2 --name=value3.
* Everything else is converted to string an passed as such.
multi_flags: set, names (strings) of flags that should be treated as
multi-flags.
Yields:
sequence of string suitable for a subprocess execution.
"""
for key, value in six.iteritems(flag_map):
if value is None:
yield '--%s' % key
elif isinstance(value, bool):
if value:
yield '--%s' % key
else:
yield '--no%s' % key
elif isinstance(value, (bytes, type(u''))):
# We don't want strings to be handled like python collections.
yield '--%s=%s' % (key, value)
else:
# Now we attempt to deal with collections.
try:
if multi_flags and key in multi_flags:
for item in value:
yield '--%s=%s' % (key, str(item))
else:
yield '--%s=%s' % (key, ','.join(str(item) for item in value))
except TypeError:
# Default case.
yield '--%s=%s' % (key, value)
def trim_docstring(docstring):
"""Removes indentation from triple-quoted strings.
This is the function specified in PEP 257 to handle docstrings:
https://www.python.org/dev/peps/pep-0257/.
Args:
docstring: str, a python docstring.
Returns:
str, docstring with indentation removed.
"""
if not docstring:
return ''
# If you've got a line longer than this you have other problems...
max_indent = 1 << 29
# 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 = max_indent
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 < max_indent:
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)
# Return a single string:
return '\n'.join(trimmed)
def doc_to_help(doc):
"""Takes a __doc__ string and reformats it as help."""
# Get rid of starting and ending white space. Using lstrip() or even
# strip() could drop more than maximum of first line and right space
# of last line.
doc = doc.strip()
# Get rid of all empty lines.
whitespace_only_line = re.compile('^[ \t]+$', re.M)
doc = whitespace_only_line.sub('', doc)
# Cut out common space at line beginnings.
doc = trim_docstring(doc)
# Just like this module's comment, comments tend to be aligned somehow.
# In other words they all start with the same amount of white space.
# 1) keep double new lines;
# 2) keep ws after new lines if not empty line;
# 3) all other new lines shall be changed to a space;
# Solution: Match new lines between non white space and replace with space.
doc = re.sub(r'(?<=\S)\n(?=\S)', ' ', doc, flags=re.M)
return doc
def is_bytes_or_string(maybe_string):
if str is bytes:
return isinstance(maybe_string, basestring)
else:
return isinstance(maybe_string, (str, bytes))