calibre-web/vendor/werkzeug/contrib/iterio.py
OzzieIsaacs bbf6d9b026 Translation of UI (german and english)
Bugfix for feeds
    - removed categories related and up
    - load new books now working
    - category random now working
login page is free of non accessible elements
boolean custom column is vivible in UI
books with only with certain languages can be shown
book shelfs can be deleted from UI
Anonymous user view is more resticted
Added browse of series in sidebar
Dependencys in vendor folder are updated to newer versions (licencs files are now present)
Bugfix editing Authors names
Made upload on windows working
2016-11-09 19:24:33 +01:00

353 lines
11 KiB
Python

# -*- coding: utf-8 -*-
r"""
werkzeug.contrib.iterio
~~~~~~~~~~~~~~~~~~~~~~~
This module implements a :class:`IterIO` that converts an iterator into
a stream object and the other way round. Converting streams into
iterators requires the `greenlet`_ module.
To convert an iterator into a stream all you have to do is to pass it
directly to the :class:`IterIO` constructor. In this example we pass it
a newly created generator::
def foo():
yield "something\n"
yield "otherthings"
stream = IterIO(foo())
print stream.read() # read the whole iterator
The other way round works a bit different because we have to ensure that
the code execution doesn't take place yet. An :class:`IterIO` call with a
callable as first argument does two things. The function itself is passed
an :class:`IterIO` stream it can feed. The object returned by the
:class:`IterIO` constructor on the other hand is not an stream object but
an iterator::
def foo(stream):
stream.write("some")
stream.write("thing")
stream.flush()
stream.write("otherthing")
iterator = IterIO(foo)
print iterator.next() # prints something
print iterator.next() # prints otherthing
iterator.next() # raises StopIteration
.. _greenlet: http://codespeak.net/py/dist/greenlet.html
:copyright: (c) 2014 by the Werkzeug Team, see AUTHORS for more details.
:license: BSD, see LICENSE for more details.
"""
try:
import greenlet
except ImportError:
greenlet = None
from werkzeug._compat import implements_iterator
def _mixed_join(iterable, sentinel):
"""concatenate any string type in an intelligent way."""
iterator = iter(iterable)
first_item = next(iterator, sentinel)
if isinstance(first_item, bytes):
return first_item + b''.join(iterator)
return first_item + u''.join(iterator)
def _newline(reference_string):
if isinstance(reference_string, bytes):
return b'\n'
return u'\n'
@implements_iterator
class IterIO(object):
"""Instances of this object implement an interface compatible with the
standard Python :class:`file` object. Streams are either read-only or
write-only depending on how the object is created.
If the first argument is an iterable a file like object is returned that
returns the contents of the iterable. In case the iterable is empty
read operations will return the sentinel value.
If the first argument is a callable then the stream object will be
created and passed to that function. The caller itself however will
not receive a stream but an iterable. The function will be be executed
step by step as something iterates over the returned iterable. Each
call to :meth:`flush` will create an item for the iterable. If
:meth:`flush` is called without any writes in-between the sentinel
value will be yielded.
Note for Python 3: due to the incompatible interface of bytes and
streams you should set the sentinel value explicitly to an empty
bytestring (``b''``) if you are expecting to deal with bytes as
otherwise the end of the stream is marked with the wrong sentinel
value.
.. versionadded:: 0.9
`sentinel` parameter was added.
"""
def __new__(cls, obj, sentinel=''):
try:
iterator = iter(obj)
except TypeError:
return IterI(obj, sentinel)
return IterO(iterator, sentinel)
def __iter__(self):
return self
def tell(self):
if self.closed:
raise ValueError('I/O operation on closed file')
return self.pos
def isatty(self):
if self.closed:
raise ValueError('I/O operation on closed file')
return False
def seek(self, pos, mode=0):
if self.closed:
raise ValueError('I/O operation on closed file')
raise IOError(9, 'Bad file descriptor')
def truncate(self, size=None):
if self.closed:
raise ValueError('I/O operation on closed file')
raise IOError(9, 'Bad file descriptor')
def write(self, s):
if self.closed:
raise ValueError('I/O operation on closed file')
raise IOError(9, 'Bad file descriptor')
def writelines(self, list):
if self.closed:
raise ValueError('I/O operation on closed file')
raise IOError(9, 'Bad file descriptor')
def read(self, n=-1):
if self.closed:
raise ValueError('I/O operation on closed file')
raise IOError(9, 'Bad file descriptor')
def readlines(self, sizehint=0):
if self.closed:
raise ValueError('I/O operation on closed file')
raise IOError(9, 'Bad file descriptor')
def readline(self, length=None):
if self.closed:
raise ValueError('I/O operation on closed file')
raise IOError(9, 'Bad file descriptor')
def flush(self):
if self.closed:
raise ValueError('I/O operation on closed file')
raise IOError(9, 'Bad file descriptor')
def __next__(self):
if self.closed:
raise StopIteration()
line = self.readline()
if not line:
raise StopIteration()
return line
class IterI(IterIO):
"""Convert an stream into an iterator."""
def __new__(cls, func, sentinel=''):
if greenlet is None:
raise RuntimeError('IterI requires greenlet support')
stream = object.__new__(cls)
stream._parent = greenlet.getcurrent()
stream._buffer = []
stream.closed = False
stream.sentinel = sentinel
stream.pos = 0
def run():
func(stream)
stream.close()
g = greenlet.greenlet(run, stream._parent)
while 1:
rv = g.switch()
if not rv:
return
yield rv[0]
def close(self):
if not self.closed:
self.closed = True
self._flush_impl()
def write(self, s):
if self.closed:
raise ValueError('I/O operation on closed file')
if s:
self.pos += len(s)
self._buffer.append(s)
def writelines(self, list):
for item in list:
self.write(item)
def flush(self):
if self.closed:
raise ValueError('I/O operation on closed file')
self._flush_impl()
def _flush_impl(self):
data = _mixed_join(self._buffer, self.sentinel)
self._buffer = []
if not data and self.closed:
self._parent.switch()
else:
self._parent.switch((data,))
class IterO(IterIO):
"""Iter output. Wrap an iterator and give it a stream like interface."""
def __new__(cls, gen, sentinel=''):
self = object.__new__(cls)
self._gen = gen
self._buf = None
self.sentinel = sentinel
self.closed = False
self.pos = 0
return self
def __iter__(self):
return self
def _buf_append(self, string):
'''Replace string directly without appending to an empty string,
avoiding type issues.'''
if not self._buf:
self._buf = string
else:
self._buf += string
def close(self):
if not self.closed:
self.closed = True
if hasattr(self._gen, 'close'):
self._gen.close()
def seek(self, pos, mode=0):
if self.closed:
raise ValueError('I/O operation on closed file')
if mode == 1:
pos += self.pos
elif mode == 2:
self.read()
self.pos = min(self.pos, self.pos + pos)
return
elif mode != 0:
raise IOError('Invalid argument')
buf = []
try:
tmp_end_pos = len(self._buf)
while pos > tmp_end_pos:
item = self._gen.next()
tmp_end_pos += len(item)
buf.append(item)
except StopIteration:
pass
if buf:
self._buf_append(_mixed_join(buf, self.sentinel))
self.pos = max(0, pos)
def read(self, n=-1):
if self.closed:
raise ValueError('I/O operation on closed file')
if n < 0:
self._buf_append(_mixed_join(self._gen, self.sentinel))
result = self._buf[self.pos:]
self.pos += len(result)
return result
new_pos = self.pos + n
buf = []
try:
tmp_end_pos = 0 if self._buf is None else len(self._buf)
while new_pos > tmp_end_pos or (self._buf is None and not buf):
item = next(self._gen)
tmp_end_pos += len(item)
buf.append(item)
except StopIteration:
pass
if buf:
self._buf_append(_mixed_join(buf, self.sentinel))
if self._buf is None:
return self.sentinel
new_pos = max(0, new_pos)
try:
return self._buf[self.pos:new_pos]
finally:
self.pos = min(new_pos, len(self._buf))
def readline(self, length=None):
if self.closed:
raise ValueError('I/O operation on closed file')
nl_pos = -1
if self._buf:
nl_pos = self._buf.find(_newline(self._buf), self.pos)
buf = []
try:
if self._buf is None:
pos = self.pos
else:
pos = len(self._buf)
while nl_pos < 0:
item = next(self._gen)
local_pos = item.find(_newline(item))
buf.append(item)
if local_pos >= 0:
nl_pos = pos + local_pos
break
pos += len(item)
except StopIteration:
pass
if buf:
self._buf_append(_mixed_join(buf, self.sentinel))
if self._buf is None:
return self.sentinel
if nl_pos < 0:
new_pos = len(self._buf)
else:
new_pos = nl_pos + 1
if length is not None and self.pos + length < new_pos:
new_pos = self.pos + length
try:
return self._buf[self.pos:new_pos]
finally:
self.pos = min(new_pos, len(self._buf))
def readlines(self, sizehint=0):
total = 0
lines = []
line = self.readline()
while line:
lines.append(line)
total += len(line)
if 0 < sizehint <= total:
break
line = self.readline()
return lines