"""
General helpers required for `tqdm.std`.
"""
import os
import re
import sys
from functools import wraps
from warnings import warn
from weakref import proxy
# py2/3 compat
try:
_range = xrange
except NameError:
_range = range
try:
_unich = unichr
except NameError:
_unich = chr
try:
_unicode = unicode
except NameError:
_unicode = str
try:
_basestring = basestring
except NameError:
_basestring = str
CUR_OS = sys.platform
IS_WIN = any(CUR_OS.startswith(i) for i in ['win32', 'cygwin'])
IS_NIX = any(CUR_OS.startswith(i) for i in ['aix', 'linux', 'darwin'])
RE_ANSI = re.compile(r"\x1b\[[;\d]*[A-Za-z]")
try:
if IS_WIN:
import colorama
else:
raise ImportError
except ImportError:
colorama = None
else:
try:
colorama.init(strip=False)
except TypeError:
colorama.init()
class FormatReplace(object):
"""
>>> a = FormatReplace('something')
>>> "{:5d}".format(a)
'something'
""" # NOQA: P102
def __init__(self, replace=''):
self.replace = replace
self.format_called = 0
def __format__(self, _):
self.format_called += 1
return self.replace
class Comparable(object):
"""Assumes child has self._comparable attr/@property"""
def __lt__(self, other):
return self._comparable < other._comparable
def __le__(self, other):
return (self < other) or (self == other)
def __eq__(self, other):
return self._comparable == other._comparable
def __ne__(self, other):
return not self == other
def __gt__(self, other):
return not self <= other
def __ge__(self, other):
return not self < other
class ObjectWrapper(object):
def __getattr__(self, name):
return getattr(self._wrapped, name)
def __setattr__(self, name, value):
return setattr(self._wrapped, name, value)
def wrapper_getattr(self, name):
"""Actual `self.getattr` rather than self._wrapped.getattr"""
try:
return object.__getattr__(self, name)
except AttributeError: # py2
return getattr(self, name)
def wrapper_setattr(self, name, value):
"""Actual `self.setattr` rather than self._wrapped.setattr"""
return object.__setattr__(self, name, value)
def __init__(self, wrapped):
"""
Thin wrapper around a given object
"""
self.wrapper_setattr('_wrapped', wrapped)
class SimpleTextIOWrapper(ObjectWrapper):
"""
Change only `.write()` of the wrapped object by encoding the passed
value and passing the result to the wrapped object's `.write()` method.
"""
# pylint: disable=too-few-public-methods
def __init__(self, wrapped, encoding):
super(SimpleTextIOWrapper, self).__init__(wrapped)
self.wrapper_setattr('encoding', encoding)
def write(self, s):
"""
Encode `s` and pass to the wrapped object's `.write()` method.
"""
return self._wrapped.write(s.encode(self.wrapper_getattr('encoding')))
def __eq__(self, other):
return self._wrapped == getattr(other, '_wrapped', other)
class DisableOnWriteError(ObjectWrapper):
"""
Disable the given `tqdm_instance` upon `write()` or `flush()` errors.
"""
@staticmethod
def disable_on_exception(tqdm_instance, func):
"""
Quietly set `tqdm_instance.miniters=inf` if `func` raises `errno=5`.
"""
tqdm_instance = proxy(tqdm_instance)
def inner(*args, **kwargs):
try:
return func(*args, **kwargs)
except OSError as e:
if e.errno != 5:
raise
try:
tqdm_instance.miniters = float('inf')
except ReferenceError:
pass
except ValueError as e:
if 'closed' not in str(e):
raise
try:
tqdm_instance.miniters = float('inf')
except ReferenceError:
pass
return inner
def __init__(self, wrapped, tqdm_instance):
super(DisableOnWriteError, self).__init__(wrapped)
if hasattr(wrapped, 'write'):
self.wrapper_setattr(
'write', self.disable_on_exception(tqdm_instance, wrapped.write))
if hasattr(wrapped, 'flush'):
self.wrapper_setattr(
'flush', self.disable_on_exception(tqdm_instance, wrapped.flush))
def __eq__(self, other):
return self._wrapped == getattr(other, '_wrapped', other)
class CallbackIOWrapper(ObjectWrapper):
def __init__(self, callback, stream, method="read"):
"""
Wrap a given `file`-like object's `read()` or `write()` to report
lengths to the given `callback`
"""
super(CallbackIOWrapper, self).__init__(stream)
func = getattr(stream, method)
if method == "write":
@wraps(func)
def write(data, *args, **kwargs):
res = func(data, *args, **kwargs)
callback(len(data))
return res
self.wrapper_setattr('write', write)
elif method == "read":
@wraps(func)
def read(*args, **kwargs):
data = func(*args, **kwargs)
callback(len(data))
return data
self.wrapper_setattr('read', read)
else:
raise KeyError("Can only wrap read/write methods")
def _is_utf(encoding):
try:
u'\u2588\u2589'.encode(encoding)
except UnicodeEncodeError:
return False
except Exception:
try:
return encoding.lower().startswith('utf-') or ('U8' == encoding)
except Exception:
return False
else:
return True
def _supports_unicode(fp):
try:
return _is_utf(fp.encoding)
except AttributeError:
return False
def _is_ascii(s):
if isinstance(s, str):
for c in s:
if ord(c) > 255:
return False
return True
return _supports_unicode(s)
def _screen_shape_wrapper(): # pragma: no cover
"""
Return a function which returns console dimensions (width, height).
Supported: linux, osx, windows, cygwin.
"""
_screen_shape = None
if IS_WIN:
_screen_shape = _screen_shape_windows
if _screen_shape is None:
_screen_shape = _screen_shape_tput
if IS_NIX:
_screen_shape = _screen_shape_linux
return _screen_shape
def _screen_shape_windows(fp): # pragma: no cover
try:
import struct
from ctypes import create_string_buffer, windll
from sys import stdin, stdout
io_handle = -12 # assume stderr
if fp == stdin:
io_handle = -10
elif fp == stdout:
io_handle = -11
h = windll.kernel32.GetStdHandle(io_handle)
csbi = create_string_buffer(22)
res = windll.kernel32.GetConsoleScreenBufferInfo(h, csbi)
if res:
(_bufx, _bufy, _curx, _cury, _wattr, left, top, right, bottom,
_maxx, _maxy) = struct.unpack("hhhhHhhhhhh", csbi.raw)
return right - left, bottom - top # +1
except Exception: # nosec
pass
return None, None
def _screen_shape_tput(*_): # pragma: no cover
"""cygwin xterm (windows)"""
try:
import shlex
from subprocess import check_call # nosec
return [int(check_call(shlex.split('tput ' + i))) - 1
for i in ('cols', 'lines')]
except Exception: # nosec
pass
return None, None
def _screen_shape_linux(fp): # pragma: no cover
try:
from array import array
from fcntl import ioctl
from termios import TIOCGWINSZ
except ImportError:
return None, None
else:
try:
rows, cols = array('h', ioctl(fp, TIOCGWINSZ, '\0' * 8))[:2]
return cols, rows
except Exception:
try:
return [int(os.environ[i]) - 1 for i in ("COLUMNS", "LINES")]
except (KeyError, ValueError):
return None, None
def _environ_cols_wrapper(): # pragma: no cover
"""
Return a function which returns console width.
Supported: linux, osx, windows, cygwin.
"""
warn("Use `_screen_shape_wrapper()(file)[0]` instead of"
" `_environ_cols_wrapper()(file)`", DeprecationWarning, stacklevel=2)
shape = _screen_shape_wrapper()
if not shape:
return None
@wraps(shape)
def inner(fp):
return shape(fp)[0]
return inner
def _term_move_up(): # pragma: no cover
return '' if (os.name == 'nt') and (colorama is None) else '\x1b[A'
try:
# TODO consider using wcswidth third-party package for 0-width characters
from unicodedata import east_asian_width
except ImportError:
_text_width = len
else:
def _text_width(s):
return sum(2 if east_asian_width(ch) in 'FW' else 1 for ch in _unicode(s))
def disp_len(data):
"""
Returns the real on-screen length of a string which may contain
ANSI control codes and wide chars.
"""
return _text_width(RE_ANSI.sub('', data))
def disp_trim(data, length):
"""
Trim a string which may contain ANSI control characters.
"""
if len(data) == disp_len(data):
return data[:length]
ansi_present = bool(RE_ANSI.search(data))
while disp_len(data) > length: # carefully delete one char at a time
data = data[:-1]
if ansi_present and bool(RE_ANSI.search(data)):
# assume ANSI reset is required
return data if data.endswith("\033[0m") else data + "\033[0m"
return data