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from pypy.interpreter.error import OperationError, oefmt
from pypy.interpreter.typedef import (
TypeDef, generic_new_descr, GetSetProperty)
from pypy.interpreter.gateway import interp2app, unwrap_spec, WrappedDefault
from pypy.module._io.interp_textio import (
W_TextIOBase, W_IncrementalNewlineDecoder)
from pypy.module._io.interp_iobase import convert_size
class UnicodeIO(object):
def __init__(self, data=None, pos=0):
if data is None:
data = []
self.data = data
self.pos = pos
def resize(self, newlength):
if len(self.data) > newlength:
self.data = self.data[:newlength]
if len(self.data) < newlength:
self.data.extend([u'\0'] * (newlength - len(self.data)))
def read(self, size):
start = self.pos
available = len(self.data) - start
if available <= 0:
return u''
if size >= 0 and size <= available:
end = start + size
else:
end = len(self.data)
assert 0 <= start <= end
self.pos = end
return u''.join(self.data[start:end])
def _convert_limit(self, limit):
if limit < 0 or limit > len(self.data) - self.pos:
limit = len(self.data) - self.pos
if limit < 0: # happens when self.pos > len(self.data)
limit = 0
return limit
def readline_universal(self, limit):
# Universal newline search. Find any of \r, \r\n, \n
limit = self._convert_limit(limit)
start = self.pos
if start >= len(self.data):
return u''
end = start + limit
pos = start
while pos < end:
ch = self.data[pos]
pos += 1
if ch == '\n':
break
if ch == '\r':
if pos >= end:
break
if self.data[pos] == '\n':
pos += 1
break
else:
break
self.pos = pos
result = u''.join(self.data[start:pos])
return result
def readline(self, marker, limit):
start = self.pos
limit = self._convert_limit(limit)
if start >= len(self.data):
return u''
end = start + limit
found = False
for pos in range(start, end - len(marker) + 1):
ch = self.data[pos]
if ch == marker[0]:
for j in range(1, len(marker)):
if self.data[pos + j] != marker[j]:
break # from inner loop
else:
pos += len(marker)
found = True
break
if not found:
pos = end
self.pos = pos
result = u''.join(self.data[start:pos])
return result
def write(self, string):
length = len(string)
if self.pos + length > len(self.data):
self.resize(self.pos + length)
for i in range(length):
self.data[self.pos + i] = string[i]
self.pos += length
def seek(self, pos):
self.pos = pos
def truncate(self, size):
if size < len(self.data):
self.resize(size)
def getvalue(self):
return u''.join(self.data)
class W_StringIO(W_TextIOBase):
def __init__(self, space):
W_TextIOBase.__init__(self, space)
self.buf = UnicodeIO()
@unwrap_spec(w_newline = WrappedDefault(u"\n"))
def descr_init(self, space, w_initvalue=None, w_newline=None):
# In case __init__ is called multiple times
self.buf = UnicodeIO()
self.w_decoder = None
self.readnl = None
self.writenl = None
if space.is_w(w_newline, space.w_None):
newline = None
else:
newline = space.unicode_w(w_newline)
if (newline is not None and newline != u"" and newline != u"\n" and
newline != u"\r" and newline != u"\r\n"):
# Not using oefmt() because I don't know how to use it
# with unicode
raise OperationError(space.w_ValueError,
space.mod(
space.newtext("illegal newline value: %s"), w_newline
)
)
if newline is not None:
self.readnl = newline
self.readuniversal = newline is None or newline == u""
self.readtranslate = newline is None
if newline and newline[0] == u"\r":
self.writenl = newline
if self.readuniversal:
self.w_decoder = space.call_function(
space.gettypefor(W_IncrementalNewlineDecoder),
space.w_None,
space.newint(int(self.readtranslate))
)
if not space.is_none(w_initvalue):
self.write_w(space, w_initvalue)
self.buf.pos = 0
def descr_getstate(self, space):
w_initialval = self.getvalue_w(space)
w_dict = space.call_method(self.w_dict, "copy")
if self.readnl is None:
w_readnl = space.w_None
else:
w_readnl = space.str(space.newunicode(self.readnl)) # YYY
return space.newtuple([
w_initialval, w_readnl, space.newint(self.buf.pos), w_dict
])
def descr_setstate(self, space, w_state):
self._check_closed(space)
# We allow the state tuple to be longer than 4, because we may need
# someday to extend the object's state without breaking
# backwards-compatibility
if (not space.isinstance_w(w_state, space.w_tuple)
or space.len_w(w_state) < 4):
raise oefmt(space.w_TypeError,
"%T.__setstate__ argument should be a 4-tuple, got %T",
self, w_state)
w_initval, w_readnl, w_pos, w_dict = space.unpackiterable(w_state, 4)
if not space.isinstance_w(w_initval, space.w_unicode):
raise oefmt(space.w_TypeError,
"unicode argument expected, got '%T'", w_initval)
# Initialize state
self.descr_init(space, None, w_readnl)
# Restore the buffer state. We're not doing it via __init__
# because the string value in the state tuple has already been
# translated once by __init__. So we do not take any chance and replace
# object's buffer completely
initval = space.unicode_w(w_initval)
pos = space.getindex_w(w_pos, space.w_TypeError)
if pos < 0:
raise oefmt(space.w_ValueError,
"position value cannot be negative")
self.buf = UnicodeIO(list(initval), pos)
if not space.is_w(w_dict, space.w_None):
if not space.isinstance_w(w_dict, space.w_dict):
raise oefmt(
space.w_TypeError,
"fourth item of state should be a dict, got a %T", w_dict)
# Alternatively, we could replace the internal dictionary
# completely. However, it seems more practical to just update it.
space.call_method(self.w_dict, "update", w_dict)
def _check_closed(self, space, message=None):
if self.buf is None:
if message is None:
message = "I/O operation on closed file"
raise OperationError(space.w_ValueError, space.newtext(message))
def write_w(self, space, w_obj):
if not space.isinstance_w(w_obj, space.w_unicode):
raise oefmt(space.w_TypeError,
"unicode argument expected, got '%T'", w_obj)
self._check_closed(space)
orig_size = space.len_w(w_obj)
if self.w_decoder is not None:
w_decoded = space.call_method(
self.w_decoder, "decode", w_obj, space.w_True)
else:
w_decoded = w_obj
if self.writenl:
w_decoded = space.call_method(
w_decoded, "replace",
space.newtext("\n"), space.newunicode(self.writenl))
string = space.unicode_w(w_decoded)
if string:
self.buf.write(string)
return space.newint(orig_size)
def read_w(self, space, w_size=None):
self._check_closed(space)
size = convert_size(space, w_size)
return space.newunicode(self.buf.read(size))
def readline_w(self, space, w_limit=None):
self._check_closed(space)
limit = convert_size(space, w_limit)
if self.readuniversal:
result = self.buf.readline_universal(limit)
else:
if self.readtranslate:
# Newlines are already translated, only search for \n
newline = u'\n'
else:
newline = self.readnl
result = self.buf.readline(newline, limit)
return space.newunicode(result)
@unwrap_spec(pos=int, mode=int)
def seek_w(self, space, pos, mode=0):
self._check_closed(space)
if not 0 <= mode <= 2:
raise oefmt(space.w_ValueError,
"Invalid whence (%d, should be 0, 1 or 2)", mode)
elif mode == 0 and pos < 0:
raise oefmt(space.w_ValueError, "negative seek position: %d", pos)
elif mode != 0 and pos != 0:
raise oefmt(space.w_IOError, "Can't do nonzero cur-relative seeks")
# XXX: this makes almost no sense, but its how CPython does it.
if mode == 1:
pos = self.buf.pos
elif mode == 2:
pos = len(self.buf.data)
assert pos >= 0
self.buf.seek(pos)
return space.newint(pos)
def truncate_w(self, space, w_size=None):
self._check_closed(space)
if space.is_none(w_size):
size = self.buf.pos
else:
size = space.int_w(w_size)
if size < 0:
raise oefmt(space.w_ValueError, "Negative size value %d", size)
self.buf.truncate(size)
return space.newint(size)
def getvalue_w(self, space):
self._check_closed(space)
return space.newunicode(self.buf.getvalue())
def readable_w(self, space):
self._check_closed(space)
return space.w_True
def writable_w(self, space):
self._check_closed(space)
return space.w_True
def seekable_w(self, space):
self._check_closed(space)
return space.w_True
def close_w(self, space):
self.buf = None
def needs_finalizer(self):
# 'self.buf = None' is not necessary when the object goes away
return type(self) is not W_StringIO
def closed_get_w(self, space):
return space.newbool(self.buf is None)
def line_buffering_get_w(self, space):
return space.w_False
def newlines_get_w(self, space):
if self.w_decoder is None:
return space.w_None
return space.getattr(self.w_decoder, space.newtext("newlines"))
W_StringIO.typedef = TypeDef(
'_io.StringIO', W_TextIOBase.typedef,
__new__ = generic_new_descr(W_StringIO),
__init__ = interp2app(W_StringIO.descr_init),
__getstate__ = interp2app(W_StringIO.descr_getstate),
__setstate__ = interp2app(W_StringIO.descr_setstate),
write = interp2app(W_StringIO.write_w),
read = interp2app(W_StringIO.read_w),
readline = interp2app(W_StringIO.readline_w),
seek = interp2app(W_StringIO.seek_w),
truncate = interp2app(W_StringIO.truncate_w),
getvalue = interp2app(W_StringIO.getvalue_w),
readable = interp2app(W_StringIO.readable_w),
writable = interp2app(W_StringIO.writable_w),
seekable = interp2app(W_StringIO.seekable_w),
close = interp2app(W_StringIO.close_w),
closed = GetSetProperty(W_StringIO.closed_get_w),
line_buffering = GetSetProperty(W_StringIO.line_buffering_get_w),
newlines = GetSetProperty(W_StringIO.newlines_get_w),
)
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