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Batuhan Berk Başoğlu 2020-11-12 11:05:57 -05:00
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"""
My own variation on function-specific inspect-like features.
"""
# Author: Gael Varoquaux <gael dot varoquaux at normalesup dot org>
# Copyright (c) 2009 Gael Varoquaux
# License: BSD Style, 3 clauses.
import inspect
import warnings
import re
import os
import collections
from itertools import islice
from tokenize import open as open_py_source
from .logger import pformat
full_argspec_fields = ('args varargs varkw defaults kwonlyargs '
'kwonlydefaults annotations')
full_argspec_type = collections.namedtuple('FullArgSpec', full_argspec_fields)
def get_func_code(func):
""" Attempts to retrieve a reliable function code hash.
The reason we don't use inspect.getsource is that it caches the
source, whereas we want this to be modified on the fly when the
function is modified.
Returns
-------
func_code: string
The function code
source_file: string
The path to the file in which the function is defined.
first_line: int
The first line of the code in the source file.
Notes
------
This function does a bit more magic than inspect, and is thus
more robust.
"""
source_file = None
try:
code = func.__code__
source_file = code.co_filename
if not os.path.exists(source_file):
# Use inspect for lambda functions and functions defined in an
# interactive shell, or in doctests
source_code = ''.join(inspect.getsourcelines(func)[0])
line_no = 1
if source_file.startswith('<doctest '):
source_file, line_no = re.match(
r'\<doctest (.*\.rst)\[(.*)\]\>', source_file).groups()
line_no = int(line_no)
source_file = '<doctest %s>' % source_file
return source_code, source_file, line_no
# Try to retrieve the source code.
with open_py_source(source_file) as source_file_obj:
first_line = code.co_firstlineno
# All the lines after the function definition:
source_lines = list(islice(source_file_obj, first_line - 1, None))
return ''.join(inspect.getblock(source_lines)), source_file, first_line
except:
# If the source code fails, we use the hash. This is fragile and
# might change from one session to another.
if hasattr(func, '__code__'):
# Python 3.X
return str(func.__code__.__hash__()), source_file, -1
else:
# Weird objects like numpy ufunc don't have __code__
# This is fragile, as quite often the id of the object is
# in the repr, so it might not persist across sessions,
# however it will work for ufuncs.
return repr(func), source_file, -1
def _clean_win_chars(string):
"""Windows cannot encode some characters in filename."""
import urllib
if hasattr(urllib, 'quote'):
quote = urllib.quote
else:
# In Python 3, quote is elsewhere
import urllib.parse
quote = urllib.parse.quote
for char in ('<', '>', '!', ':', '\\'):
string = string.replace(char, quote(char))
return string
def get_func_name(func, resolv_alias=True, win_characters=True):
""" Return the function import path (as a list of module names), and
a name for the function.
Parameters
----------
func: callable
The func to inspect
resolv_alias: boolean, optional
If true, possible local aliases are indicated.
win_characters: boolean, optional
If true, substitute special characters using urllib.quote
This is useful in Windows, as it cannot encode some filenames
"""
if hasattr(func, '__module__'):
module = func.__module__
else:
try:
module = inspect.getmodule(func)
except TypeError:
if hasattr(func, '__class__'):
module = func.__class__.__module__
else:
module = 'unknown'
if module is None:
# Happens in doctests, eg
module = ''
if module == '__main__':
try:
filename = os.path.abspath(inspect.getsourcefile(func))
except:
filename = None
if filename is not None:
# mangling of full path to filename
parts = filename.split(os.sep)
if parts[-1].startswith('<ipython-input'):
# We're in a IPython (or notebook) session. parts[-1] comes
# from func.__code__.co_filename and is of the form
# <ipython-input-N-XYZ>, where:
# - N is the cell number where the function was defined
# - XYZ is a hash representing the function's code (and name).
# It will be consistent across sessions and kernel restarts,
# and will change if the function's code/name changes
# We remove N so that cache is properly hit if the cell where
# the func is defined is re-exectuted.
# The XYZ hash should avoid collisions between functions with
# the same name, both within the same notebook but also across
# notebooks
splitted = parts[-1].split('-')
parts[-1] = '-'.join(splitted[:2] + splitted[3:])
filename = '-'.join(parts)
if filename.endswith('.py'):
filename = filename[:-3]
module = module + '-' + filename
module = module.split('.')
if hasattr(func, 'func_name'):
name = func.func_name
elif hasattr(func, '__name__'):
name = func.__name__
else:
name = 'unknown'
# Hack to detect functions not defined at the module-level
if resolv_alias:
# TODO: Maybe add a warning here?
if hasattr(func, 'func_globals') and name in func.func_globals:
if not func.func_globals[name] is func:
name = '%s-alias' % name
if inspect.ismethod(func):
# We need to add the name of the class
if hasattr(func, 'im_class'):
klass = func.im_class
module.append(klass.__name__)
if os.name == 'nt' and win_characters:
# Windows can't encode certain characters in filenames
name = _clean_win_chars(name)
module = [_clean_win_chars(s) for s in module]
return module, name
def _signature_str(function_name, arg_spec):
"""Helper function to output a function signature"""
arg_spec_str = inspect.formatargspec(*arg_spec)
return '{}{}'.format(function_name, arg_spec_str)
def _function_called_str(function_name, args, kwargs):
"""Helper function to output a function call"""
template_str = '{0}({1}, {2})'
args_str = repr(args)[1:-1]
kwargs_str = ', '.join('%s=%s' % (k, v)
for k, v in kwargs.items())
return template_str.format(function_name, args_str,
kwargs_str)
def filter_args(func, ignore_lst, args=(), kwargs=dict()):
""" Filters the given args and kwargs using a list of arguments to
ignore, and a function specification.
Parameters
----------
func: callable
Function giving the argument specification
ignore_lst: list of strings
List of arguments to ignore (either a name of an argument
in the function spec, or '*', or '**')
*args: list
Positional arguments passed to the function.
**kwargs: dict
Keyword arguments passed to the function
Returns
-------
filtered_args: list
List of filtered positional and keyword arguments.
"""
args = list(args)
if isinstance(ignore_lst, str):
# Catch a common mistake
raise ValueError(
'ignore_lst must be a list of parameters to ignore '
'%s (type %s) was given' % (ignore_lst, type(ignore_lst)))
# Special case for functools.partial objects
if (not inspect.ismethod(func) and not inspect.isfunction(func)):
if ignore_lst:
warnings.warn('Cannot inspect object %s, ignore list will '
'not work.' % func, stacklevel=2)
return {'*': args, '**': kwargs}
arg_spec = inspect.getfullargspec(func)
arg_names = arg_spec.args + arg_spec.kwonlyargs
arg_defaults = arg_spec.defaults or ()
if arg_spec.kwonlydefaults:
arg_defaults = arg_defaults + tuple(arg_spec.kwonlydefaults[k]
for k in arg_spec.kwonlyargs
if k in arg_spec.kwonlydefaults)
arg_varargs = arg_spec.varargs
arg_varkw = arg_spec.varkw
if inspect.ismethod(func):
# First argument is 'self', it has been removed by Python
# we need to add it back:
args = [func.__self__, ] + args
# XXX: Maybe I need an inspect.isbuiltin to detect C-level methods, such
# as on ndarrays.
_, name = get_func_name(func, resolv_alias=False)
arg_dict = dict()
arg_position = -1
for arg_position, arg_name in enumerate(arg_names):
if arg_position < len(args):
# Positional argument or keyword argument given as positional
if arg_name not in arg_spec.kwonlyargs:
arg_dict[arg_name] = args[arg_position]
else:
raise ValueError(
"Keyword-only parameter '%s' was passed as "
'positional parameter for %s:\n'
' %s was called.'
% (arg_name,
_signature_str(name, arg_spec),
_function_called_str(name, args, kwargs))
)
else:
position = arg_position - len(arg_names)
if arg_name in kwargs:
arg_dict[arg_name] = kwargs[arg_name]
else:
try:
arg_dict[arg_name] = arg_defaults[position]
except (IndexError, KeyError) as e:
# Missing argument
raise ValueError(
'Wrong number of arguments for %s:\n'
' %s was called.'
% (_signature_str(name, arg_spec),
_function_called_str(name, args, kwargs))
) from e
varkwargs = dict()
for arg_name, arg_value in sorted(kwargs.items()):
if arg_name in arg_dict:
arg_dict[arg_name] = arg_value
elif arg_varkw is not None:
varkwargs[arg_name] = arg_value
else:
raise TypeError("Ignore list for %s() contains an unexpected "
"keyword argument '%s'" % (name, arg_name))
if arg_varkw is not None:
arg_dict['**'] = varkwargs
if arg_varargs is not None:
varargs = args[arg_position + 1:]
arg_dict['*'] = varargs
# Now remove the arguments to be ignored
for item in ignore_lst:
if item in arg_dict:
arg_dict.pop(item)
else:
raise ValueError("Ignore list: argument '%s' is not defined for "
"function %s"
% (item,
_signature_str(name, arg_spec))
)
# XXX: Return a sorted list of pairs?
return arg_dict
def _format_arg(arg):
formatted_arg = pformat(arg, indent=2)
if len(formatted_arg) > 1500:
formatted_arg = '%s...' % formatted_arg[:700]
return formatted_arg
def format_signature(func, *args, **kwargs):
# XXX: Should this use inspect.formatargvalues/formatargspec?
module, name = get_func_name(func)
module = [m for m in module if m]
if module:
module.append(name)
module_path = '.'.join(module)
else:
module_path = name
arg_str = list()
previous_length = 0
for arg in args:
formatted_arg = _format_arg(arg)
if previous_length > 80:
formatted_arg = '\n%s' % formatted_arg
previous_length = len(formatted_arg)
arg_str.append(formatted_arg)
arg_str.extend(['%s=%s' % (v, _format_arg(i)) for v, i in kwargs.items()])
arg_str = ', '.join(arg_str)
signature = '%s(%s)' % (name, arg_str)
return module_path, signature
def format_call(func, args, kwargs, object_name="Memory"):
""" Returns a nicely formatted statement displaying the function
call with the given arguments.
"""
path, signature = format_signature(func, *args, **kwargs)
msg = '%s\n[%s] Calling %s...\n%s' % (80 * '_', object_name,
path, signature)
return msg
# XXX: Not using logging framework
# self.debug(msg)