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|
import sys
from pypy.interpreter.baseobjspace import W_Root
from pypy.interpreter.error import OperationError, oefmt
from pypy.interpreter.gateway import WrappedDefault, interp2app, unwrap_spec
from pypy.interpreter.typedef import (
GetSetProperty, TypeDef, generic_new_descr, interp_attrproperty,
interp_attrproperty_w)
from pypy.module._codecs import interp_codecs
from pypy.module._io.interp_iobase import W_IOBase, convert_size, trap_eintr
from rpython.rlib.rarithmetic import intmask, r_uint, r_ulonglong
from rpython.rlib.rbigint import rbigint
from rpython.rlib.rstring import UnicodeBuilder
STATE_ZERO, STATE_OK, STATE_DETACHED = range(3)
SEEN_CR = 1
SEEN_LF = 2
SEEN_CRLF = 4
SEEN_ALL = SEEN_CR | SEEN_LF | SEEN_CRLF
_WINDOWS = sys.platform == 'win32'
class W_IncrementalNewlineDecoder(W_Root):
seennl = 0
pendingcr = False
w_decoder = None
def __init__(self, space):
self.w_newlines_dict = {
SEEN_CR: space.newunicode(u"\r"),
SEEN_LF: space.newunicode(u"\n"),
SEEN_CRLF: space.newunicode(u"\r\n"),
SEEN_CR | SEEN_LF: space.newtuple(
[space.newunicode(u"\r"), space.newunicode(u"\n")]),
SEEN_CR | SEEN_CRLF: space.newtuple(
[space.newunicode(u"\r"), space.newunicode(u"\r\n")]),
SEEN_LF | SEEN_CRLF: space.newtuple(
[space.newunicode(u"\n"), space.newunicode(u"\r\n")]),
SEEN_CR | SEEN_LF | SEEN_CRLF: space.newtuple(
[space.newunicode(u"\r"), space.newunicode(u"\n"), space.newunicode(u"\r\n")]),
}
@unwrap_spec(translate=int)
def descr_init(self, space, w_decoder, translate, w_errors=None):
self.w_decoder = w_decoder
self.translate = translate
if space.is_none(w_errors):
self.w_errors = space.newtext("strict")
else:
self.w_errors = w_errors
self.seennl = 0
def newlines_get_w(self, space):
return self.w_newlines_dict.get(self.seennl, space.w_None)
@unwrap_spec(final=int)
def decode_w(self, space, w_input, final=False):
if self.w_decoder is None:
raise oefmt(space.w_ValueError,
"IncrementalNewlineDecoder.__init__ not called")
# decode input (with the eventual \r from a previous pass)
if not space.is_w(self.w_decoder, space.w_None):
w_output = space.call_method(self.w_decoder, "decode",
w_input, space.newbool(bool(final)))
else:
w_output = w_input
if not space.isinstance_w(w_output, space.w_unicode):
raise oefmt(space.w_TypeError,
"decoder should return a string result")
output = space.unicode_w(w_output)
output_len = len(output)
if self.pendingcr and (final or output_len):
output = u'\r' + output
self.pendingcr = False
output_len += 1
# retain last \r even when not translating data:
# then readline() is sure to get \r\n in one pass
if not final and output_len > 0:
last = output_len - 1
assert last >= 0
if output[last] == u'\r':
output = output[:last]
self.pendingcr = True
output_len -= 1
if output_len == 0:
return space.newunicode(u"")
# Record which newlines are read and do newline translation if
# desired, all in one pass.
seennl = self.seennl
# If, up to now, newlines are consistently \n, do a quick check
# for the \r
only_lf = False
if seennl == SEEN_LF or seennl == 0:
only_lf = (output.find(u'\r') < 0)
if only_lf:
# If not already seen, quick scan for a possible "\n" character.
# (there's nothing else to be done, even when in translation mode)
if seennl == 0 and output.find(u'\n') >= 0:
seennl |= SEEN_LF
# Finished: we have scanned for newlines, and none of them
# need translating.
elif not self.translate:
i = 0
while i < output_len:
if seennl == SEEN_ALL:
break
c = output[i]
i += 1
if c == u'\n':
seennl |= SEEN_LF
elif c == u'\r':
if i < output_len and output[i] == u'\n':
seennl |= SEEN_CRLF
i += 1
else:
seennl |= SEEN_CR
elif output.find(u'\r') >= 0:
# Translate!
builder = UnicodeBuilder(output_len)
i = 0
while i < output_len:
c = output[i]
i += 1
if c == u'\n':
seennl |= SEEN_LF
elif c == u'\r':
if i < output_len and output[i] == u'\n':
seennl |= SEEN_CRLF
i += 1
else:
seennl |= SEEN_CR
builder.append(u'\n')
continue
builder.append(c)
output = builder.build()
self.seennl |= seennl
return space.newunicode(output)
def reset_w(self, space):
self.seennl = 0
self.pendingcr = False
if self.w_decoder and not space.is_w(self.w_decoder, space.w_None):
space.call_method(self.w_decoder, "reset")
def getstate_w(self, space):
if self.w_decoder and not space.is_w(self.w_decoder, space.w_None):
w_state = space.call_method(self.w_decoder, "getstate")
w_buffer, w_flag = space.unpackiterable(w_state, 2)
flag = space.r_longlong_w(w_flag)
else:
w_buffer = space.newbytes("")
flag = 0
flag <<= 1
if self.pendingcr:
flag |= 1
return space.newtuple([w_buffer, space.newint(flag)])
def setstate_w(self, space, w_state):
w_buffer, w_flag = space.unpackiterable(w_state, 2)
flag = space.r_longlong_w(w_flag)
self.pendingcr = bool(flag & 1)
flag >>= 1
if self.w_decoder and not space.is_w(self.w_decoder, space.w_None):
w_state = space.newtuple([w_buffer, space.newint(flag)])
space.call_method(self.w_decoder, "setstate", w_state)
W_IncrementalNewlineDecoder.typedef = TypeDef(
'_io.IncrementalNewlineDecoder',
__new__ = generic_new_descr(W_IncrementalNewlineDecoder),
__init__ = interp2app(W_IncrementalNewlineDecoder.descr_init),
decode = interp2app(W_IncrementalNewlineDecoder.decode_w),
reset = interp2app(W_IncrementalNewlineDecoder.reset_w),
getstate = interp2app(W_IncrementalNewlineDecoder.getstate_w),
setstate = interp2app(W_IncrementalNewlineDecoder.setstate_w),
newlines = GetSetProperty(W_IncrementalNewlineDecoder.newlines_get_w),
)
class W_TextIOBase(W_IOBase):
w_encoding = None
def __init__(self, space):
W_IOBase.__init__(self, space)
def read_w(self, space, w_size=None):
self._unsupportedoperation(space, "read")
def readline_w(self, space, w_limit=None):
self._unsupportedoperation(space, "readline")
def write_w(self, space, w_data):
self._unsupportedoperation(space, "write")
def detach_w(self, space):
self._unsupportedoperation(space, "detach")
def errors_get_w(self, space):
return space.w_None
def newlines_get_w(self, space):
return space.w_None
def _find_line_ending(self, line, start, end):
size = end - start
if self.readtranslate:
# Newlines are already translated, only search for \n
pos = line.find(u'\n', start, end)
if pos >= 0:
return pos - start + 1, 0
else:
return -1, size
elif self.readuniversal:
# Universal newline search. Find any of \r, \r\n, \n
# The decoder ensures that \r\n are not split in two pieces
i = 0
while True:
# Fast path for non-control chars. The loop always ends
# since the Py_UNICODE storage is NUL-terminated.
while i < size and line[start + i] > '\r':
i += 1
if i >= size:
return -1, size
ch = line[start + i]
i += 1
if ch == '\n':
return i, 0
if ch == '\r':
if line[start + i] == '\n':
return i + 1, 0
else:
return i, 0
else:
# Non-universal mode.
pos = line.find(self.readnl, start, end)
if pos >= 0:
return pos - start + len(self.readnl), 0
else:
pos = line.find(self.readnl[0], start, end)
if pos >= 0:
return -1, pos - start
return -1, size
W_TextIOBase.typedef = TypeDef(
'_io._TextIOBase', W_IOBase.typedef,
__new__ = generic_new_descr(W_TextIOBase),
read = interp2app(W_TextIOBase.read_w),
readline = interp2app(W_TextIOBase.readline_w),
write = interp2app(W_TextIOBase.write_w),
detach = interp2app(W_TextIOBase.detach_w),
encoding = interp_attrproperty_w("w_encoding", W_TextIOBase),
newlines = GetSetProperty(W_TextIOBase.newlines_get_w),
errors = GetSetProperty(W_TextIOBase.errors_get_w),
)
def _determine_encoding(space, encoding):
if encoding is not None:
return space.newtext(encoding)
try:
w_locale = space.call_method(space.builtin, '__import__',
space.newtext('locale'))
w_encoding = space.call_method(w_locale, 'getpreferredencoding')
except OperationError as e:
# getpreferredencoding() may also raise ImportError
if not e.match(space, space.w_ImportError):
raise
return space.newtext('ascii')
else:
if space.isinstance_w(w_encoding, space.w_text):
return w_encoding
raise oefmt(space.w_IOError, "could not determine default encoding")
class PositionCookie(object):
def __init__(self, bigint):
self.start_pos = bigint.ulonglongmask()
bigint = bigint.rshift(r_ulonglong.BITS)
x = intmask(bigint.uintmask())
assert x >= 0
self.dec_flags = x
bigint = bigint.rshift(r_uint.BITS)
x = intmask(bigint.uintmask())
assert x >= 0
self.bytes_to_feed = x
bigint = bigint.rshift(r_uint.BITS)
x = intmask(bigint.uintmask())
assert x >= 0
self.chars_to_skip = x
bigint = bigint.rshift(r_uint.BITS)
self.need_eof = bigint.tobool()
def pack(self):
# The meaning of a tell() cookie is: seek to position, set the
# decoder flags to dec_flags, read bytes_to_feed bytes, feed them
# into the decoder with need_eof as the EOF flag, then skip
# chars_to_skip characters of the decoded result. For most simple
# decoders, tell() will often just give a byte offset in the file.
rb = rbigint.fromrarith_int
res = rb(self.start_pos)
bits = r_ulonglong.BITS
res = res.or_(rb(r_uint(self.dec_flags)).lshift(bits))
bits += r_uint.BITS
res = res.or_(rb(r_uint(self.bytes_to_feed)).lshift(bits))
bits += r_uint.BITS
res = res.or_(rb(r_uint(self.chars_to_skip)).lshift(bits))
bits += r_uint.BITS
return res.or_(rb(r_uint(self.need_eof)).lshift(bits))
class PositionSnapshot:
def __init__(self, flags, input):
self.flags = flags
self.input = input
def check_decoded(space, w_decoded):
if not space.isinstance_w(w_decoded, space.w_unicode):
msg = "decoder should return a string result, not '%T'"
raise oefmt(space.w_TypeError, msg, w_decoded)
class W_TextIOWrapper(W_TextIOBase):
def __init__(self, space):
W_TextIOBase.__init__(self, space)
self.state = STATE_ZERO
self.w_encoder = None
self.w_decoder = None
self.decoded_chars = None # buffer for text returned from decoder
self.decoded_chars_used = 0 # offset into _decoded_chars for read()
self.pending_bytes = None # list of bytes objects waiting to be
# written, or NULL
self.chunk_size = 8192
self.readuniversal = False
self.readtranslate = False
self.readnl = None
self.encodefunc = None # Specialized encoding func (see below)
self.encoding_start_of_stream = False # Whether or not it's the start
# of the stream
self.snapshot = None
@unwrap_spec(encoding="text_or_none", line_buffering=int)
def descr_init(self, space, w_buffer, encoding=None,
w_errors=None, w_newline=None, line_buffering=0):
self.state = STATE_ZERO
self.w_buffer = w_buffer
self.w_encoding = _determine_encoding(space, encoding)
if space.is_none(w_errors):
w_errors = space.newtext("strict")
self.w_errors = w_errors
if space.is_none(w_newline):
newline = None
else:
newline = space.unicode_w(w_newline)
if newline and newline not in (u'\n', u'\r\n', u'\r'):
raise oefmt(space.w_ValueError,
"illegal newline value: %R", w_newline)
self.line_buffering = line_buffering
self.readuniversal = not newline # null or empty
self.readtranslate = newline is None
self.readnl = newline
self.writetranslate = (newline != u'')
if not self.readuniversal:
self.writenl = self.readnl
if self.writenl == u'\n':
self.writenl = None
elif _WINDOWS:
self.writenl = u"\r\n"
else:
self.writenl = None
# build the decoder object
if space.is_true(space.call_method(w_buffer, "readable")):
w_codec = interp_codecs.lookup_codec(space,
space.text_w(self.w_encoding))
self.w_decoder = space.call_method(w_codec,
"incrementaldecoder", w_errors)
if self.readuniversal:
self.w_decoder = space.call_function(
space.gettypeobject(W_IncrementalNewlineDecoder.typedef),
self.w_decoder, space.newbool(self.readtranslate))
# build the encoder object
if space.is_true(space.call_method(w_buffer, "writable")):
w_codec = interp_codecs.lookup_codec(space,
space.text_w(self.w_encoding))
self.w_encoder = space.call_method(w_codec,
"incrementalencoder", w_errors)
self.seekable = space.is_true(space.call_method(w_buffer, "seekable"))
self.telling = self.seekable
self.encoding_start_of_stream = False
if self.seekable and self.w_encoder:
self.encoding_start_of_stream = True
w_cookie = space.call_method(self.w_buffer, "tell")
if not space.eq_w(w_cookie, space.newint(0)):
self.encoding_start_of_stream = False
space.call_method(self.w_encoder, "setstate", space.newint(0))
self.state = STATE_OK
def _check_init(self, space):
if self.state == STATE_ZERO:
raise oefmt(space.w_ValueError,
"I/O operation on uninitialized object")
def _check_attached(self, space):
if self.state == STATE_DETACHED:
raise oefmt(space.w_ValueError,
"underlying buffer has been detached")
self._check_init(space)
def _check_closed(self, space, message=None):
self._check_init(space)
W_TextIOBase._check_closed(self, space, message)
def descr_repr(self, space):
self._check_init(space)
w_name = space.findattr(self, space.newtext("name"))
if w_name is None:
w_name_str = space.newtext("")
else:
w_name_str = space.mod(space.newtext("name=%r "), w_name)
w_args = space.newtuple([w_name_str, self.w_encoding])
return space.mod(
space.newtext("<_io.TextIOWrapper %sencoding=%r>"), w_args
)
def readable_w(self, space):
self._check_attached(space)
return space.call_method(self.w_buffer, "readable")
def writable_w(self, space):
self._check_attached(space)
return space.call_method(self.w_buffer, "writable")
def seekable_w(self, space):
self._check_attached(space)
return space.call_method(self.w_buffer, "seekable")
def isatty_w(self, space):
self._check_attached(space)
return space.call_method(self.w_buffer, "isatty")
def fileno_w(self, space):
self._check_attached(space)
return space.call_method(self.w_buffer, "fileno")
def closed_get_w(self, space):
self._check_attached(space)
return space.getattr(self.w_buffer, space.newtext("closed"))
def newlines_get_w(self, space):
self._check_attached(space)
if self.w_decoder is None:
return space.w_None
return space.findattr(self.w_decoder, space.newtext("newlines"))
def name_get_w(self, space):
self._check_attached(space)
return space.getattr(self.w_buffer, space.newtext("name"))
def flush_w(self, space):
self._check_attached(space)
self._check_closed(space)
self.telling = self.seekable
self._writeflush(space)
space.call_method(self.w_buffer, "flush")
@unwrap_spec(w_pos = WrappedDefault(None))
def truncate_w(self, space, w_pos=None):
self._check_attached(space)
space.call_method(self, "flush")
return space.call_method(self.w_buffer, "truncate", w_pos)
def close_w(self, space):
self._check_attached(space)
if not space.is_true(space.getattr(self.w_buffer,
space.newtext("closed"))):
try:
space.call_method(self, "flush")
finally:
ret = space.call_method(self.w_buffer, "close")
return ret
# _____________________________________________________________
# read methods
def _set_decoded_chars(self, chars):
self.decoded_chars = chars
self.decoded_chars_used = 0
def _get_decoded_chars(self, size):
if self.decoded_chars is None:
return u""
available = len(self.decoded_chars) - self.decoded_chars_used
if size < 0 or size > available:
size = available
assert size >= 0
if self.decoded_chars_used > 0 or size < available:
start = self.decoded_chars_used
end = self.decoded_chars_used + size
assert start >= 0
assert end >= 0
chars = self.decoded_chars[start:end]
else:
chars = self.decoded_chars
self.decoded_chars_used += size
return chars
def _read_chunk(self, space):
"""Read and decode the next chunk of data from the BufferedReader.
The return value is True unless EOF was reached. The decoded string
is placed in self._decoded_chars (replacing its previous value).
The entire input chunk is sent to the decoder, though some of it may
remain buffered in the decoder, yet to be converted."""
if not self.w_decoder:
raise oefmt(space.w_IOError, "not readable")
if self.telling:
# To prepare for tell(), we need to snapshot a point in the file
# where the decoder's input buffer is empty.
w_state = space.call_method(self.w_decoder, "getstate")
# Given this, we know there was a valid snapshot point
# len(dec_buffer) bytes ago with decoder state (b'', dec_flags).
w_dec_buffer, w_dec_flags = space.unpackiterable(w_state, 2)
dec_buffer = space.bytes_w(w_dec_buffer)
dec_flags = space.int_w(w_dec_flags)
else:
dec_buffer = None
dec_flags = 0
# Read a chunk, decode it, and put the result in self._decoded_chars
w_input = space.call_method(self.w_buffer, "read1",
space.newint(self.chunk_size))
if not space.isinstance_w(w_input, space.w_bytes):
msg = "decoder getstate() should have returned a bytes " \
"object not '%T'"
raise oefmt(space.w_TypeError, msg, w_input)
eof = space.len_w(w_input) == 0
w_decoded = space.call_method(self.w_decoder, "decode",
w_input, space.newbool(eof))
check_decoded(space, w_decoded)
self._set_decoded_chars(space.unicode_w(w_decoded))
if space.len_w(w_decoded) > 0:
eof = False
if self.telling:
# At the snapshot point, len(dec_buffer) bytes before the read,
# the next input to be decoded is dec_buffer + input_chunk.
next_input = dec_buffer + space.bytes_w(w_input)
self.snapshot = PositionSnapshot(dec_flags, next_input)
return not eof
def next_w(self, space):
self._check_attached(space)
self.telling = False
try:
return W_TextIOBase.next_w(self, space)
except OperationError as e:
if e.match(space, space.w_StopIteration):
self.telling = self.seekable
raise
def read_w(self, space, w_size=None):
self._check_attached(space)
self._check_closed(space)
if not self.w_decoder:
raise oefmt(space.w_IOError, "not readable")
size = convert_size(space, w_size)
self._writeflush(space)
if size < 0:
# Read everything
w_bytes = space.call_method(self.w_buffer, "read")
w_decoded = space.call_method(self.w_decoder, "decode", w_bytes, space.w_True)
check_decoded(space, w_decoded)
w_result = space.newunicode(self._get_decoded_chars(-1))
w_final = space.add(w_result, w_decoded)
self.snapshot = None
return w_final
remaining = size
builder = UnicodeBuilder(size)
# Keep reading chunks until we have n characters to return
while True:
data = self._get_decoded_chars(remaining)
builder.append(data)
remaining -= len(data)
if remaining <= 0: # Done
break
try:
if not self._read_chunk(space):
# EOF
break
except OperationError as e:
if trap_eintr(space, e):
continue
raise
return space.newunicode(builder.build())
def readline_w(self, space, w_limit=None):
self._check_attached(space)
self._check_closed(space)
self._writeflush(space)
limit = convert_size(space, w_limit)
chunked = 0
line = None
remaining = None
chunks = []
while True:
# First, get some data if necessary
has_data = True
while not self.decoded_chars:
try:
if not self._read_chunk(space):
has_data = False
break
except OperationError as e:
if trap_eintr(space, e):
continue
raise
if not has_data:
# end of file
self._set_decoded_chars(None)
self.snapshot = None
start = endpos = offset_to_buffer = 0
break
if not remaining:
line = self.decoded_chars
start = self.decoded_chars_used
offset_to_buffer = 0
else:
assert self.decoded_chars_used == 0
line = remaining + self.decoded_chars
start = 0
offset_to_buffer = len(remaining)
remaining = None
line_len = len(line)
endpos, consumed = self._find_line_ending(line, start, line_len)
if endpos >= 0:
endpos += start
if limit >= 0 and endpos >= start + limit - chunked:
endpos = start + limit - chunked
assert endpos >= 0
break
assert consumed >= 0
# We can put aside up to `endpos`
endpos = consumed + start
if limit >= 0 and endpos >= start + limit - chunked:
# Didn't find line ending, but reached length limit
endpos = start + limit - chunked
assert endpos >= 0
break
# No line ending seen yet - put aside current data
if endpos > start:
s = line[start:endpos]
chunks.append(s)
chunked += len(s)
# There may be some remaining bytes we'll have to prepend to the
# next chunk of data
if endpos < line_len:
remaining = line[endpos:]
line = None
# We have consumed the buffer
self._set_decoded_chars(None)
if line:
# Our line ends in the current buffer
decoded_chars_used = endpos - offset_to_buffer
assert decoded_chars_used >= 0
self.decoded_chars_used = decoded_chars_used
if start > 0 or endpos < len(line):
line = line[start:endpos]
if remaining:
chunks.append(remaining)
remaining = None
if chunks:
if line:
chunks.append(line)
line = u''.join(chunks)
if line:
return space.newunicode(line)
else:
return space.newunicode(u'')
# _____________________________________________________________
# write methods
def write_w(self, space, w_text):
self._check_attached(space)
self._check_closed(space)
if not self.w_encoder:
raise oefmt(space.w_IOError, "not writable")
if not space.isinstance_w(w_text, space.w_unicode):
raise oefmt(space.w_TypeError,
"unicode argument expected, got '%T'", w_text)
text = space.unicode_w(w_text)
textlen = len(text)
haslf = False
if (self.writetranslate and self.writenl) or self.line_buffering:
if text.find(u'\n') >= 0:
haslf = True
if haslf and self.writetranslate and self.writenl:
w_text = space.call_method(w_text, "replace", space.newunicode(u'\n'),
space.newunicode(self.writenl))
text = space.unicode_w(w_text)
needflush = False
if self.line_buffering and (haslf or text.find(u'\r') >= 0):
needflush = True
# XXX What if we were just reading?
if self.encodefunc:
w_bytes = self.encodefunc(space, w_text, self.errors)
self.encoding_start_of_stream = False
else:
w_bytes = space.call_method(self.w_encoder, "encode", w_text)
b = space.bytes_w(w_bytes)
if not self.pending_bytes:
self.pending_bytes = []
self.pending_bytes_count = 0
self.pending_bytes.append(b)
self.pending_bytes_count += len(b)
if self.pending_bytes_count > self.chunk_size or needflush:
self._writeflush(space)
if needflush:
space.call_method(self.w_buffer, "flush")
self.snapshot = None
if self.w_decoder:
space.call_method(self.w_decoder, "reset")
return space.newint(textlen)
def _writeflush(self, space):
if not self.pending_bytes:
return
pending_bytes = ''.join(self.pending_bytes)
self.pending_bytes = None
self.pending_bytes_count = 0
while True:
try:
space.call_method(self.w_buffer, "write",
space.newbytes(pending_bytes))
except OperationError as e:
if trap_eintr(space, e):
continue
raise
else:
break
def detach_w(self, space):
self._check_attached(space)
space.call_method(self, "flush")
w_buffer = self.w_buffer
self.w_buffer = None
self.state = STATE_DETACHED
return w_buffer
# _____________________________________________________________
# seek/tell
def _decoder_setstate(self, space, cookie):
# When seeking to the start of the stream, we call decoder.reset()
# rather than decoder.getstate().
# This is for a few decoders such as utf-16 for which the state value
# at start is not (b"", 0) but e.g. (b"", 2) (meaning, in the case of
# utf-16, that we are expecting a BOM).
if cookie.start_pos == 0 and cookie.dec_flags == 0:
space.call_method(self.w_decoder, "reset")
else:
space.call_method(self.w_decoder, "setstate",
space.newtuple([space.newbytes(""),
space.newint(cookie.dec_flags)]))
def _encoder_setstate(self, space, cookie):
if cookie.start_pos == 0 and cookie.dec_flags == 0:
space.call_method(self.w_encoder, "reset")
self.encoding_start_of_stream = True
else:
space.call_method(self.w_encoder, "setstate", space.newint(0))
self.encoding_start_of_stream = False
@unwrap_spec(whence=int)
def seek_w(self, space, w_pos, whence=0):
self._check_attached(space)
if not self.seekable:
raise oefmt(space.w_IOError, "underlying stream is not seekable")
if whence == 1:
# seek relative to current position
if not space.eq_w(w_pos, space.newint(0)):
raise oefmt(space.w_IOError,
"can't do nonzero cur-relative seeks")
# Seeking to the current position should attempt to sync the
# underlying buffer with the current position.
w_pos = space.call_method(self, "tell")
elif whence == 2:
# seek relative to end of file
if not space.eq_w(w_pos, space.newint(0)):
raise oefmt(space.w_IOError,
"can't do nonzero end-relative seeks")
space.call_method(self, "flush")
self._set_decoded_chars(None)
self.snapshot = None
if self.w_decoder:
space.call_method(self.w_decoder, "reset")
return space.call_method(self.w_buffer, "seek",
w_pos, space.newint(whence))
elif whence != 0:
raise oefmt(space.w_ValueError,
"invalid whence (%d, should be 0, 1 or 2)",
whence)
if space.is_true(space.lt(w_pos, space.newint(0))):
raise oefmt(space.w_ValueError,
"negative seek position %R", w_pos)
space.call_method(self, "flush")
# The strategy of seek() is to go back to the safe start point and
# replay the effect of read(chars_to_skip) from there.
cookie = PositionCookie(space.bigint_w(w_pos))
# Seek back to the safe start point
space.call_method(self.w_buffer, "seek", space.newint(cookie.start_pos))
self._set_decoded_chars(None)
self.snapshot = None
# Restore the decoder to its state from the safe start point.
if self.w_decoder:
self._decoder_setstate(space, cookie)
if cookie.chars_to_skip:
# Just like _read_chunk, feed the decoder and save a snapshot.
w_chunk = space.call_method(self.w_buffer, "read",
space.newint(cookie.bytes_to_feed))
if not space.isinstance_w(w_chunk, space.w_bytes):
msg = "underlying read() should have returned " \
"a bytes object, not '%T'"
raise oefmt(space.w_TypeError, msg, w_chunk)
self.snapshot = PositionSnapshot(cookie.dec_flags,
space.bytes_w(w_chunk))
w_decoded = space.call_method(self.w_decoder, "decode",
w_chunk, space.newbool(bool(cookie.need_eof)))
check_decoded(space, w_decoded)
self._set_decoded_chars(space.unicode_w(w_decoded))
# Skip chars_to_skip of the decoded characters
if len(self.decoded_chars) < cookie.chars_to_skip:
raise oefmt(space.w_IOError,
"can't restore logical file position")
self.decoded_chars_used = cookie.chars_to_skip
else:
self.snapshot = PositionSnapshot(cookie.dec_flags, "")
# Finally, reset the encoder (merely useful for proper BOM handling)
if self.w_encoder:
self._encoder_setstate(space, cookie)
return w_pos
def tell_w(self, space):
self._check_closed(space)
if not self.seekable:
raise oefmt(space.w_IOError, "underlying stream is not seekable")
if not self.telling:
raise oefmt(space.w_IOError,
"telling position disabled by next() call")
self._writeflush(space)
space.call_method(self, "flush")
w_pos = space.call_method(self.w_buffer, "tell")
if self.w_decoder is None or self.snapshot is None:
assert not self.decoded_chars
return w_pos
cookie = PositionCookie(space.bigint_w(w_pos))
# Skip backward to the snapshot point (see _read_chunk)
cookie.dec_flags = self.snapshot.flags
input = self.snapshot.input
cookie.start_pos -= len(input)
# How many decoded characters have been used up since the snapshot?
if not self.decoded_chars_used:
# We haven't moved from the snapshot point.
return space.newlong_from_rbigint(cookie.pack())
chars_to_skip = self.decoded_chars_used
# Starting from the snapshot position, we will walk the decoder
# forward until it gives us enough decoded characters.
w_saved_state = space.call_method(self.w_decoder, "getstate")
try:
# Note our initial start point
self._decoder_setstate(space, cookie)
# Feed the decoder one byte at a time. As we go, note the nearest
# "safe start point" before the current location (a point where
# the decoder has nothing buffered, so seek() can safely start
# from there and advance to this location).
chars_decoded = 0
i = 0
while i < len(input):
w_decoded = space.call_method(self.w_decoder, "decode",
space.newbytes(input[i]))
check_decoded(space, w_decoded)
chars_decoded += len(space.unicode_w(w_decoded))
cookie.bytes_to_feed += 1
w_state = space.call_method(self.w_decoder, "getstate")
w_dec_buffer, w_flags = space.unpackiterable(w_state, 2)
dec_buffer_len = space.len_w(w_dec_buffer)
if dec_buffer_len == 0 and chars_decoded <= chars_to_skip:
# Decoder buffer is empty, so this is a safe start point.
cookie.start_pos += cookie.bytes_to_feed
chars_to_skip -= chars_decoded
assert chars_to_skip >= 0
cookie.dec_flags = space.int_w(w_flags)
cookie.bytes_to_feed = 0
chars_decoded = 0
if chars_decoded >= chars_to_skip:
break
i += 1
else:
# We didn't get enough decoded data; signal EOF to get more.
w_decoded = space.call_method(self.w_decoder, "decode",
space.newbytes(""),
space.newint(1)) # final=1
check_decoded(space, w_decoded)
chars_decoded += len(space.unicode_w(w_decoded))
cookie.need_eof = 1
if chars_decoded < chars_to_skip:
raise oefmt(space.w_IOError,
"can't reconstruct logical file position")
finally:
space.call_method(self.w_decoder, "setstate", w_saved_state)
# The returned cookie corresponds to the last safe start point.
cookie.chars_to_skip = chars_to_skip
return space.newlong_from_rbigint(cookie.pack())
def chunk_size_get_w(self, space):
self._check_attached(space)
return space.newint(self.chunk_size)
def chunk_size_set_w(self, space, w_size):
self._check_attached(space)
size = space.int_w(w_size)
if size <= 0:
raise oefmt(space.w_ValueError,
"a strictly positive integer is required")
self.chunk_size = size
W_TextIOWrapper.typedef = TypeDef(
'_io.TextIOWrapper', W_TextIOBase.typedef,
__new__ = generic_new_descr(W_TextIOWrapper),
__init__ = interp2app(W_TextIOWrapper.descr_init),
__repr__ = interp2app(W_TextIOWrapper.descr_repr),
next = interp2app(W_TextIOWrapper.next_w),
read = interp2app(W_TextIOWrapper.read_w),
readline = interp2app(W_TextIOWrapper.readline_w),
write = interp2app(W_TextIOWrapper.write_w),
seek = interp2app(W_TextIOWrapper.seek_w),
tell = interp2app(W_TextIOWrapper.tell_w),
detach = interp2app(W_TextIOWrapper.detach_w),
flush = interp2app(W_TextIOWrapper.flush_w),
truncate = interp2app(W_TextIOWrapper.truncate_w),
close = interp2app(W_TextIOWrapper.close_w),
line_buffering = interp_attrproperty("line_buffering", W_TextIOWrapper,
wrapfn="newint"),
readable = interp2app(W_TextIOWrapper.readable_w),
writable = interp2app(W_TextIOWrapper.writable_w),
seekable = interp2app(W_TextIOWrapper.seekable_w),
isatty = interp2app(W_TextIOWrapper.isatty_w),
fileno = interp2app(W_TextIOWrapper.fileno_w),
name = GetSetProperty(W_TextIOWrapper.name_get_w),
buffer = interp_attrproperty_w("w_buffer", cls=W_TextIOWrapper),
closed = GetSetProperty(W_TextIOWrapper.closed_get_w),
errors = interp_attrproperty_w("w_errors", cls=W_TextIOWrapper),
newlines = GetSetProperty(W_TextIOWrapper.newlines_get_w),
_CHUNK_SIZE = GetSetProperty(
W_TextIOWrapper.chunk_size_get_w, W_TextIOWrapper.chunk_size_set_w
),
)
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