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Issue #12591: Allow io.TextIOWrapper to work with raw IO objects (without

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a read1() method), and add a *write_through* parameter to
mandate unbuffered writes.
This commit is contained in:
Antoine Pitrou 2011-07-23 21:50:21 +02:00
commit d42c1d09e9
4 changed files with 45 additions and 8 deletions
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8
Lib/_pyio.py
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@ -1478,7 +1478,7 @@ class TextIOWrapper(TextIOBase):
_CHUNK_SIZE = 2048
def __init__(self, buffer, encoding=None, errors=None, newline=None,
line_buffering=False):
line_buffering=False, write_through=False):
if newline is not None and not isinstance(newline, str):
raise TypeError("illegal newline type: %r" % (type(newline),))
if newline not in (None, "", "\n", "\r", "\r\n"):
@ -1521,6 +1521,7 @@ class TextIOWrapper(TextIOBase):
self._decoded_chars_used = 0 # offset into _decoded_chars for read()
self._snapshot = None # info for reconstructing decoder state
self._seekable = self._telling = self.buffer.seekable()
self._has_read1 = hasattr(self.buffer, 'read1')
self._b2cratio = 0.0
if self._seekable and self.writable():
@ -1687,7 +1688,10 @@ class TextIOWrapper(TextIOBase):
# len(dec_buffer) bytes ago with decoder state (b'', dec_flags).
# Read a chunk, decode it, and put the result in self._decoded_chars.
input_chunk = self.buffer.read1(self._CHUNK_SIZE)
if self._has_read1:
input_chunk = self.buffer.read1(self._CHUNK_SIZE)
else:
input_chunk = self.buffer.read(self._CHUNK_SIZE)
eof = not input_chunk
decoded_chars = self._decoder.decode(input_chunk, eof)
self._set_decoded_chars(decoded_chars)