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cpython/Lib/test/test_io.py

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"""Unit tests for io.py."""
from __future__ import print_function
from __future__ import unicode_literals
import os
import sys
import time
import array
import threading
import random
import unittest
from itertools import chain, cycle
from test import test_support
import codecs
import io # The module under test
class MockRawIO(io.RawIOBase):
def __init__(self, read_stack=()):
self._read_stack = list(read_stack)
self._write_stack = []
def read(self, n=None):
try:
return self._read_stack.pop(0)
except:
return b""
def write(self, b):
self._write_stack.append(b[:])
return len(b)
def writable(self):
return True
def fileno(self):
return 42
def readable(self):
return True
def seekable(self):
return True
def seek(self, pos, whence):
pass
def tell(self):
return 42
class MockFileIO(io.BytesIO):
def __init__(self, data):
self.read_history = []
io.BytesIO.__init__(self, data)
def read(self, n=None):
res = io.BytesIO.read(self, n)
self.read_history.append(None if res is None else len(res))
return res
class MockNonBlockWriterIO(io.RawIOBase):
def __init__(self, blocking_script):
self._blocking_script = list(blocking_script)
self._write_stack = []
def write(self, b):
self._write_stack.append(b[:])
n = self._blocking_script.pop(0)
if (n < 0):
raise io.BlockingIOError(0, "test blocking", -n)
else:
return n
def writable(self):
return True
class IOTest(unittest.TestCase):
def tearDown(self):
test_support.unlink(test_support.TESTFN)
def write_ops(self, f):
self.assertEqual(f.write(b"blah."), 5)
f.truncate(0)
self.assertEqual(f.tell(), 5)
f.seek(0)
self.assertEqual(f.write(b"blah."), 5)
self.assertEqual(f.seek(0), 0)
self.assertEqual(f.write(b"Hello."), 6)
self.assertEqual(f.tell(), 6)
self.assertEqual(f.seek(-1, 1), 5)
self.assertEqual(f.tell(), 5)
self.assertEqual(f.write(bytearray(b" world\n\n\n")), 9)
self.assertEqual(f.seek(0), 0)
self.assertEqual(f.write(b"h"), 1)
self.assertEqual(f.seek(-1, 2), 13)
self.assertEqual(f.tell(), 13)
self.assertEqual(f.truncate(12), 12)
self.assertEqual(f.tell(), 13)
self.assertEqual(f.write(b"hij"), 3)
self.assertEqual(f.seek(0,1), 16)
self.assertEqual(f.tell(), 16)
self.assertEqual(f.truncate(12), 12)
self.assertRaises(TypeError, f.seek, 0.0)
def read_ops(self, f, buffered=False):
data = f.read(5)
self.assertEqual(data, b"hello")
data = bytearray(data)
self.assertEqual(f.readinto(data), 5)
self.assertEqual(data, b" worl")
self.assertEqual(f.readinto(data), 2)
self.assertEqual(len(data), 5)
self.assertEqual(data[:2], b"d\n")
self.assertEqual(f.seek(0), 0)
self.assertEqual(f.read(20), b"hello world\n")
self.assertEqual(f.read(1), b"")
self.assertEqual(f.readinto(bytearray(b"x")), 0)
self.assertEqual(f.seek(-6, 2), 6)
self.assertEqual(f.read(5), b"world")
self.assertEqual(f.read(0), b"")
self.assertEqual(f.readinto(bytearray()), 0)
self.assertEqual(f.seek(-6, 1), 5)
self.assertEqual(f.read(5), b" worl")
self.assertEqual(f.tell(), 10)
f.seek(0)
f.read(2)
f.seek(0, 1)
self.assertEqual(f.tell(), 2)
self.assertRaises(TypeError, f.seek, 0.0)
if buffered:
f.seek(0)
self.assertEqual(f.read(), b"hello world\n")
f.seek(6)
self.assertEqual(f.read(), b"world\n")
self.assertEqual(f.read(), b"")
LARGE = 2**31
def large_file_ops(self, f):
assert f.readable()
assert f.writable()
self.assertEqual(f.seek(self.LARGE), self.LARGE)
self.assertEqual(f.tell(), self.LARGE)
self.assertEqual(f.write(b"xxx"), 3)
self.assertEqual(f.tell(), self.LARGE + 3)
self.assertEqual(f.seek(-1, 1), self.LARGE + 2)
self.assertEqual(f.truncate(), self.LARGE + 2)
self.assertEqual(f.tell(), self.LARGE + 2)
self.assertEqual(f.seek(0, 2), self.LARGE + 2)
self.assertEqual(f.truncate(self.LARGE + 1), self.LARGE + 1)
self.assertEqual(f.tell(), self.LARGE + 2)
self.assertEqual(f.seek(0, 2), self.LARGE + 1)
self.assertEqual(f.seek(-1, 2), self.LARGE)
self.assertEqual(f.read(2), b"x")
def test_raw_file_io(self):
f = io.open(test_support.TESTFN, "wb", buffering=0)
self.assertEqual(f.readable(), False)
self.assertEqual(f.writable(), True)
self.assertEqual(f.seekable(), True)
self.write_ops(f)
f.close()
f = io.open(test_support.TESTFN, "rb", buffering=0)
self.assertEqual(f.readable(), True)
self.assertEqual(f.writable(), False)
self.assertEqual(f.seekable(), True)
self.read_ops(f)
f.close()
def test_buffered_file_io(self):
f = io.open(test_support.TESTFN, "wb")
self.assertEqual(f.readable(), False)
self.assertEqual(f.writable(), True)
self.assertEqual(f.seekable(), True)
self.write_ops(f)
f.close()
f = io.open(test_support.TESTFN, "rb")
self.assertEqual(f.readable(), True)
self.assertEqual(f.writable(), False)
self.assertEqual(f.seekable(), True)
self.read_ops(f, True)
f = io.open(test_support.TESTFN, "r+b")
self.assertEqual(f.readable(), True)
self.assertEqual(f.writable(), True)
self.assertEqual(f.seekable(), True)
self.write_ops(f)
f.seek(0)
self.read_ops(f, True)
f.close()
def test_readline(self):
f = io.open(test_support.TESTFN, "wb")
f.write(b"abc\ndef\nxyzzy\nfoo")
f.close()
f = io.open(test_support.TESTFN, "rb")
self.assertEqual(f.readline(), b"abc\n")
self.assertEqual(f.readline(10), b"def\n")
self.assertEqual(f.readline(2), b"xy")
self.assertEqual(f.readline(4), b"zzy\n")
self.assertEqual(f.readline(), b"foo")
f.close()
def test_raw_bytes_io(self):
f = io.BytesIO()
self.write_ops(f)
data = f.getvalue()
self.assertEqual(data, b"hello world\n")
f = io.BytesIO(data)
self.read_ops(f, True)
def test_large_file_ops(self):
# On Windows and Mac OSX this test comsumes large resources; It takes
# a long time to build the >2GB file and takes >2GB of disk space
# therefore the resource must be enabled to run this test.
if sys.platform[:3] in ('win', 'os2') or sys.platform == 'darwin':
if not test_support.is_resource_enabled("largefile"):
print("\nTesting large file ops skipped on %s." % sys.platform,
file=sys.stderr)
print("It requires %d bytes and a long time." % self.LARGE,
file=sys.stderr)
print("Use 'regrtest.py -u largefile test_io' to run it.",
file=sys.stderr)
return
f = io.open(test_support.TESTFN, "w+b", 0)
self.large_file_ops(f)
f.close()
f = io.open(test_support.TESTFN, "w+b")
self.large_file_ops(f)
f.close()
def test_with_open(self):
for bufsize in (0, 1, 100):
f = None
with open(test_support.TESTFN, "wb", bufsize) as f:
f.write(b"xxx")
self.assertEqual(f.closed, True)
f = None
try:
with open(test_support.TESTFN, "wb", bufsize) as f:
1 // 0
except ZeroDivisionError:
self.assertEqual(f.closed, True)
else:
self.fail("1 // 0 didn't raise an exception")
# issue 5008
def test_append_mode_tell(self):
with io.open(test_support.TESTFN, "wb") as f:
f.write(b"xxx")
with io.open(test_support.TESTFN, "ab", buffering=0) as f:
self.assertEqual(f.tell(), 3)
with io.open(test_support.TESTFN, "ab") as f:
self.assertEqual(f.tell(), 3)
with io.open(test_support.TESTFN, "a") as f:
self.assert_(f.tell() > 0)
def test_destructor(self):
record = []
class MyFileIO(io.FileIO):
def __del__(self):
record.append(1)
io.FileIO.__del__(self)
def close(self):
record.append(2)
io.FileIO.close(self)
def flush(self):
record.append(3)
io.FileIO.flush(self)
f = MyFileIO(test_support.TESTFN, "w")
f.write("xxx")
del f
self.assertEqual(record, [1, 2, 3])
def test_close_flushes(self):
f = io.open(test_support.TESTFN, "wb")
f.write(b"xxx")
f.close()
f = io.open(test_support.TESTFN, "rb")
self.assertEqual(f.read(), b"xxx")
f.close()
def XXXtest_array_writes(self):
# XXX memory view not available yet
a = array.array('i', range(10))
n = len(memoryview(a))
f = io.open(test_support.TESTFN, "wb", 0)
self.assertEqual(f.write(a), n)
f.close()
f = io.open(test_support.TESTFN, "wb")
self.assertEqual(f.write(a), n)
f.close()
def test_closefd(self):
self.assertRaises(ValueError, io.open, test_support.TESTFN, 'w',
closefd=False)
def testReadClosed(self):
with io.open(test_support.TESTFN, "w") as f:
f.write("egg\n")
with io.open(test_support.TESTFN, "r") as f:
file = io.open(f.fileno(), "r", closefd=False)
self.assertEqual(file.read(), "egg\n")
file.seek(0)
file.close()
self.assertRaises(ValueError, file.read)
def test_no_closefd_with_filename(self):
# can't use closefd in combination with a file name
self.assertRaises(ValueError,
io.open, test_support.TESTFN, "r", closefd=False)
def test_closefd_attr(self):
with io.open(test_support.TESTFN, "wb") as f:
f.write(b"egg\n")
with io.open(test_support.TESTFN, "r") as f:
self.assertEqual(f.buffer.raw.closefd, True)
file = io.open(f.fileno(), "r", closefd=False)
self.assertEqual(file.buffer.raw.closefd, False)
def test_flush_error_on_close(self):
f = io.open(test_support.TESTFN, "wb", buffering=0)
def bad_flush():
raise IOError()
f.flush = bad_flush
self.assertRaises(IOError, f.close) # exception not swallowed
def test_multi_close(self):
f = io.open(test_support.TESTFN, "wb", buffering=0)
f.close()
f.close()
f.close()
self.assertRaises(ValueError, f.flush)
class MemorySeekTestMixin:
def testInit(self):
buf = self.buftype("1234567890")
bytesIo = self.ioclass(buf)
def testRead(self):
buf = self.buftype("1234567890")
bytesIo = self.ioclass(buf)
self.assertEquals(buf[:1], bytesIo.read(1))
self.assertEquals(buf[1:5], bytesIo.read(4))
self.assertEquals(buf[5:], bytesIo.read(900))
self.assertEquals(self.EOF, bytesIo.read())
def testReadNoArgs(self):
buf = self.buftype("1234567890")
bytesIo = self.ioclass(buf)
self.assertEquals(buf, bytesIo.read())
self.assertEquals(self.EOF, bytesIo.read())
def testSeek(self):
buf = self.buftype("1234567890")
bytesIo = self.ioclass(buf)
bytesIo.read(5)
bytesIo.seek(0)
self.assertEquals(buf, bytesIo.read())
bytesIo.seek(3)
self.assertEquals(buf[3:], bytesIo.read())
self.assertRaises(TypeError, bytesIo.seek, 0.0)
def testTell(self):
buf = self.buftype("1234567890")
bytesIo = self.ioclass(buf)
self.assertEquals(0, bytesIo.tell())
bytesIo.seek(5)
self.assertEquals(5, bytesIo.tell())
bytesIo.seek(10000)
self.assertEquals(10000, bytesIo.tell())
class BytesIOTest(MemorySeekTestMixin, unittest.TestCase):
@staticmethod
def buftype(s):
return s.encode("utf-8")
ioclass = io.BytesIO
EOF = b""
class StringIOTest(MemorySeekTestMixin, unittest.TestCase):
buftype = str
ioclass = io.StringIO
EOF = ""
class BufferedReaderTest(unittest.TestCase):
def testRead(self):
rawio = MockRawIO((b"abc", b"d", b"efg"))
bufio = io.BufferedReader(rawio)
self.assertEquals(b"abcdef", bufio.read(6))
def testBuffering(self):
data = b"abcdefghi"
dlen = len(data)
tests = [
[ 100, [ 3, 1, 4, 8 ], [ dlen, 0 ] ],
[ 100, [ 3, 3, 3], [ dlen ] ],
[ 4, [ 1, 2, 4, 2 ], [ 4, 4, 1 ] ],
]
for bufsize, buf_read_sizes, raw_read_sizes in tests:
rawio = MockFileIO(data)
bufio = io.BufferedReader(rawio, buffer_size=bufsize)
pos = 0
for nbytes in buf_read_sizes:
self.assertEquals(bufio.read(nbytes), data[pos:pos+nbytes])
pos += nbytes
self.assertEquals(rawio.read_history, raw_read_sizes)
def testReadNonBlocking(self):
# Inject some None's in there to simulate EWOULDBLOCK
rawio = MockRawIO((b"abc", b"d", None, b"efg", None, None))
bufio = io.BufferedReader(rawio)
self.assertEquals(b"abcd", bufio.read(6))
self.assertEquals(b"e", bufio.read(1))
self.assertEquals(b"fg", bufio.read())
self.assert_(None is bufio.read())
self.assertEquals(b"", bufio.read())
def testReadToEof(self):
rawio = MockRawIO((b"abc", b"d", b"efg"))
bufio = io.BufferedReader(rawio)
self.assertEquals(b"abcdefg", bufio.read(9000))
def testReadNoArgs(self):
rawio = MockRawIO((b"abc", b"d", b"efg"))
bufio = io.BufferedReader(rawio)
self.assertEquals(b"abcdefg", bufio.read())
def testFileno(self):
rawio = MockRawIO((b"abc", b"d", b"efg"))
bufio = io.BufferedReader(rawio)
self.assertEquals(42, bufio.fileno())
def testFilenoNoFileno(self):
# XXX will we always have fileno() function? If so, kill
# this test. Else, write it.
pass
def testThreads(self):
try:
# Write out many bytes with exactly the same number of 0's,
# 1's... 255's. This will help us check that concurrent reading
# doesn't duplicate or forget contents.
N = 1000
l = range(256) * N
random.shuffle(l)
s = bytes(bytearray(l))
with io.open(test_support.TESTFN, "wb") as f:
f.write(s)
with io.open(test_support.TESTFN, "rb", buffering=0) as raw:
bufio = io.BufferedReader(raw, 8)
errors = []
results = []
def f():
try:
# Intra-buffer read then buffer-flushing read
for n in cycle([1, 19]):
s = bufio.read(n)
if not s:
break
# list.append() is atomic
results.append(s)
except Exception as e:
errors.append(e)
raise
threads = [threading.Thread(target=f) for x in range(20)]
for t in threads:
t.start()
time.sleep(0.02) # yield
for t in threads:
t.join()
self.assertFalse(errors,
"the following exceptions were caught: %r" % errors)
s = b''.join(results)
for i in range(256):
c = bytes(bytearray([i]))
self.assertEqual(s.count(c), N)
finally:
test_support.unlink(test_support.TESTFN)
class BufferedWriterTest(unittest.TestCase):
def testWrite(self):
# Write to the buffered IO but don't overflow the buffer.
writer = MockRawIO()
bufio = io.BufferedWriter(writer, 8)
bufio.write(b"abc")
self.assertFalse(writer._write_stack)
def testWriteOverflow(self):
writer = MockRawIO()
bufio = io.BufferedWriter(writer, 8)
bufio.write(b"abc")
bufio.write(b"defghijkl")
self.assertEquals(b"abcdefghijkl", writer._write_stack[0])
def testWriteNonBlocking(self):
raw = MockNonBlockWriterIO((9, 2, 10, -6, 10, 8, 12))
bufio = io.BufferedWriter(raw, 8, 16)
bufio.write(b"asdf")
bufio.write(b"asdfa")
self.assertEquals(b"asdfasdfa", raw._write_stack[0])
bufio.write(b"asdfasdfasdf")
self.assertEquals(b"asdfasdfasdf", raw._write_stack[1])
bufio.write(b"asdfasdfasdf")
self.assertEquals(b"dfasdfasdf", raw._write_stack[2])
self.assertEquals(b"asdfasdfasdf", raw._write_stack[3])
bufio.write(b"asdfasdfasdf")
# XXX I don't like this test. It relies too heavily on how the
# algorithm actually works, which we might change. Refactor
# later.
def testFileno(self):
rawio = MockRawIO((b"abc", b"d", b"efg"))
bufio = io.BufferedWriter(rawio)
self.assertEquals(42, bufio.fileno())
def testFlush(self):
writer = MockRawIO()
bufio = io.BufferedWriter(writer, 8)
bufio.write(b"abc")
bufio.flush()
self.assertEquals(b"abc", writer._write_stack[0])
def testThreads(self):
# BufferedWriter should not raise exceptions or crash
# when called from multiple threads.
try:
# We use a real file object because it allows us to
# exercise situations where the GIL is released before
# writing the buffer to the raw streams. This is in addition
# to concurrency issues due to switching threads in the middle
# of Python code.
with io.open(test_support.TESTFN, "wb", buffering=0) as raw:
bufio = io.BufferedWriter(raw, 8)
errors = []
def f():
try:
# Write enough bytes to flush the buffer
s = b"a" * 19
for i in range(50):
bufio.write(s)
except Exception as e:
errors.append(e)
raise
threads = [threading.Thread(target=f) for x in range(20)]
for t in threads:
t.start()
time.sleep(0.02) # yield
for t in threads:
t.join()
self.assertFalse(errors,
"the following exceptions were caught: %r" % errors)
finally:
test_support.unlink(test_support.TESTFN)
def test_flush_error_on_close(self):
raw = MockRawIO()
def bad_flush():
raise IOError()
raw.flush = bad_flush
b = io.BufferedWriter(raw)
self.assertRaises(IOError, b.close) # exception not swallowed
def test_multi_close(self):
raw = MockRawIO()
b = io.BufferedWriter(raw)
b.close()
b.close()
b.close()
self.assertRaises(ValueError, b.flush)
class BufferedRWPairTest(unittest.TestCase):
def testRWPair(self):
r = MockRawIO(())
w = MockRawIO()
pair = io.BufferedRWPair(r, w)
self.assertFalse(pair.closed)
# XXX More Tests
class BufferedRandomTest(unittest.TestCase):
def testReadAndWrite(self):
raw = MockRawIO((b"asdf", b"ghjk"))
rw = io.BufferedRandom(raw, 8, 12)
self.assertEqual(b"as", rw.read(2))
rw.write(b"ddd")
rw.write(b"eee")
self.assertFalse(raw._write_stack) # Buffer writes
self.assertEqual(b"ghjk", rw.read()) # This read forces write flush
self.assertEquals(b"dddeee", raw._write_stack[0])
def testSeekAndTell(self):
raw = io.BytesIO(b"asdfghjkl")
rw = io.BufferedRandom(raw)
self.assertEquals(b"as", rw.read(2))
self.assertEquals(2, rw.tell())
rw.seek(0, 0)
self.assertEquals(b"asdf", rw.read(4))
rw.write(b"asdf")
rw.seek(0, 0)
self.assertEquals(b"asdfasdfl", rw.read())
self.assertEquals(9, rw.tell())
rw.seek(-4, 2)
self.assertEquals(5, rw.tell())
rw.seek(2, 1)
self.assertEquals(7, rw.tell())
self.assertEquals(b"fl", rw.read(11))
self.assertRaises(TypeError, rw.seek, 0.0)
# To fully exercise seek/tell, the StatefulIncrementalDecoder has these
# properties:
# - A single output character can correspond to many bytes of input.
# - The number of input bytes to complete the character can be
# undetermined until the last input byte is received.
# - The number of input bytes can vary depending on previous input.
# - A single input byte can correspond to many characters of output.
# - The number of output characters can be undetermined until the
# last input byte is received.
# - The number of output characters can vary depending on previous input.
class StatefulIncrementalDecoder(codecs.IncrementalDecoder):
"""
For testing seek/tell behavior with a stateful, buffering decoder.
Input is a sequence of words. Words may be fixed-length (length set
by input) or variable-length (period-terminated). In variable-length
mode, extra periods are ignored. Possible words are:
- 'i' followed by a number sets the input length, I (maximum 99).
When I is set to 0, words are space-terminated.
- 'o' followed by a number sets the output length, O (maximum 99).
- Any other word is converted into a word followed by a period on
the output. The output word consists of the input word truncated
or padded out with hyphens to make its length equal to O. If O
is 0, the word is output verbatim without truncating or padding.
I and O are initially set to 1. When I changes, any buffered input is
re-scanned according to the new I. EOF also terminates the last word.
"""
def __init__(self, errors='strict'):
codecs.IncrementalDecoder.__init__(self, errors)
self.reset()
def __repr__(self):
return '<SID %x>' % id(self)
def reset(self):
self.i = 1
self.o = 1
self.buffer = bytearray()
def getstate(self):
i, o = self.i ^ 1, self.o ^ 1 # so that flags = 0 after reset()
return bytes(self.buffer), i*100 + o
def setstate(self, state):
buffer, io = state
self.buffer = bytearray(buffer)
i, o = divmod(io, 100)
self.i, self.o = i ^ 1, o ^ 1
def decode(self, input, final=False):
output = ''
for b in input:
if self.i == 0: # variable-length, terminated with period
if b == '.':
if self.buffer:
output += self.process_word()
else:
self.buffer.append(b)
else: # fixed-length, terminate after self.i bytes
self.buffer.append(b)
if len(self.buffer) == self.i:
output += self.process_word()
if final and self.buffer: # EOF terminates the last word
output += self.process_word()
return output
def process_word(self):
output = ''
if self.buffer[0] == ord('i'):
self.i = min(99, int(self.buffer[1:] or 0)) # set input length
elif self.buffer[0] == ord('o'):
self.o = min(99, int(self.buffer[1:] or 0)) # set output length
else:
output = self.buffer.decode('ascii')
if len(output) < self.o:
output += '-'*self.o # pad out with hyphens
if self.o:
output = output[:self.o] # truncate to output length
output += '.'
self.buffer = bytearray()
return output
codecEnabled = False
@classmethod
def lookupTestDecoder(cls, name):
if cls.codecEnabled and name == 'test_decoder':
latin1 = codecs.lookup('latin-1')
return codecs.CodecInfo(
name='test_decoder', encode=latin1.encode, decode=None,
incrementalencoder=None,
streamreader=None, streamwriter=None,
incrementaldecoder=cls)
# Register the previous decoder for testing.
# Disabled by default, tests will enable it.
codecs.register(StatefulIncrementalDecoder.lookupTestDecoder)
class StatefulIncrementalDecoderTest(unittest.TestCase):
"""
Make sure the StatefulIncrementalDecoder actually works.
"""
test_cases = [
# I=1, O=1 (fixed-length input == fixed-length output)
(b'abcd', False, 'a.b.c.d.'),
# I=0, O=0 (variable-length input, variable-length output)
(b'oiabcd', True, 'abcd.'),
# I=0, O=0 (should ignore extra periods)
(b'oi...abcd...', True, 'abcd.'),
# I=0, O=6 (variable-length input, fixed-length output)
(b'i.o6.x.xyz.toolongtofit.', False, 'x-----.xyz---.toolon.'),
# I=2, O=6 (fixed-length input < fixed-length output)
(b'i.i2.o6xyz', True, 'xy----.z-----.'),
# I=6, O=3 (fixed-length input > fixed-length output)
(b'i.o3.i6.abcdefghijklmnop', True, 'abc.ghi.mno.'),
# I=0, then 3; O=29, then 15 (with longer output)
(b'i.o29.a.b.cde.o15.abcdefghijabcdefghij.i3.a.b.c.d.ei00k.l.m', True,
'a----------------------------.' +
'b----------------------------.' +
'cde--------------------------.' +
'abcdefghijabcde.' +
'a.b------------.' +
'.c.------------.' +
'd.e------------.' +
'k--------------.' +
'l--------------.' +
'm--------------.')
]
def testDecoder(self):
# Try a few one-shot test cases.
for input, eof, output in self.test_cases:
d = StatefulIncrementalDecoder()
self.assertEquals(d.decode(input, eof), output)
# Also test an unfinished decode, followed by forcing EOF.
d = StatefulIncrementalDecoder()
self.assertEquals(d.decode(b'oiabcd'), '')
self.assertEquals(d.decode(b'', 1), 'abcd.')
def test_append_bom(self):
# The BOM is not written again when appending to a non-empty file
filename = test_support.TESTFN
for charset in ('utf-8-sig', 'utf-16', 'utf-32'):
with io.open(filename, 'w', encoding=charset) as f:
f.write('aaa')
pos = f.tell()
with io.open(filename, 'rb') as f:
self.assertEquals(f.read(), 'aaa'.encode(charset))
with io.open(filename, 'a', encoding=charset) as f:
f.write('xxx')
with io.open(filename, 'rb') as f:
self.assertEquals(f.read(), 'aaaxxx'.encode(charset))
def test_seek_bom(self):
# Same test, but when seeking manually
filename = test_support.TESTFN
for charset in ('utf-8-sig', 'utf-16', 'utf-32'):
with io.open(filename, 'w', encoding=charset) as f:
f.write('aaa')
pos = f.tell()
with io.open(filename, 'r+', encoding=charset) as f:
f.seek(pos)
f.write('zzz')
f.seek(0)
f.write('bbb')
with io.open(filename, 'rb') as f:
self.assertEquals(f.read(), 'bbbzzz'.encode(charset))
class TextIOWrapperTest(unittest.TestCase):
def setUp(self):
self.testdata = b"AAA\r\nBBB\rCCC\r\nDDD\nEEE\r\n"
self.normalized = b"AAA\nBBB\nCCC\nDDD\nEEE\n".decode("ascii")
def tearDown(self):
test_support.unlink(test_support.TESTFN)
def testLineBuffering(self):
r = io.BytesIO()
b = io.BufferedWriter(r, 1000)
t = io.TextIOWrapper(b, newline="\n", line_buffering=True)
t.write(u"X")
self.assertEquals(r.getvalue(), b"") # No flush happened
t.write(u"Y\nZ")
self.assertEquals(r.getvalue(), b"XY\nZ") # All got flushed
t.write(u"A\rB")
self.assertEquals(r.getvalue(), b"XY\nZA\rB")
def testEncodingErrorsReading(self):
# (1) default
b = io.BytesIO(b"abc\n\xff\n")
t = io.TextIOWrapper(b, encoding="ascii")
self.assertRaises(UnicodeError, t.read)
# (2) explicit strict
b = io.BytesIO(b"abc\n\xff\n")
t = io.TextIOWrapper(b, encoding="ascii", errors="strict")
self.assertRaises(UnicodeError, t.read)
# (3) ignore
b = io.BytesIO(b"abc\n\xff\n")
t = io.TextIOWrapper(b, encoding="ascii", errors="ignore")
self.assertEquals(t.read(), "abc\n\n")
# (4) replace
b = io.BytesIO(b"abc\n\xff\n")
t = io.TextIOWrapper(b, encoding="ascii", errors="replace")
self.assertEquals(t.read(), u"abc\n\ufffd\n")
def testEncodingErrorsWriting(self):
# (1) default
b = io.BytesIO()
t = io.TextIOWrapper(b, encoding="ascii")
self.assertRaises(UnicodeError, t.write, u"\xff")
# (2) explicit strict
b = io.BytesIO()
t = io.TextIOWrapper(b, encoding="ascii", errors="strict")
self.assertRaises(UnicodeError, t.write, u"\xff")
# (3) ignore
b = io.BytesIO()
t = io.TextIOWrapper(b, encoding="ascii", errors="ignore",
newline="\n")
t.write(u"abc\xffdef\n")
t.flush()
self.assertEquals(b.getvalue(), b"abcdef\n")
# (4) replace
b = io.BytesIO()
t = io.TextIOWrapper(b, encoding="ascii", errors="replace",
newline="\n")
t.write(u"abc\xffdef\n")
t.flush()
self.assertEquals(b.getvalue(), b"abc?def\n")
def testNewlinesInput(self):
testdata = b"AAA\nBBB\nCCC\rDDD\rEEE\r\nFFF\r\nGGG"
normalized = testdata.replace(b"\r\n", b"\n").replace(b"\r", b"\n")
for newline, expected in [
(None, normalized.decode("ascii").splitlines(True)),
("", testdata.decode("ascii").splitlines(True)),
("\n", ["AAA\n", "BBB\n", "CCC\rDDD\rEEE\r\n", "FFF\r\n", "GGG"]),
("\r\n", ["AAA\nBBB\nCCC\rDDD\rEEE\r\n", "FFF\r\n", "GGG"]),
("\r", ["AAA\nBBB\nCCC\r", "DDD\r", "EEE\r", "\nFFF\r", "\nGGG"]),
]:
buf = io.BytesIO(testdata)
txt = io.TextIOWrapper(buf, encoding="ascii", newline=newline)
self.assertEquals(txt.readlines(), expected)
txt.seek(0)
self.assertEquals(txt.read(), "".join(expected))
def testNewlinesOutput(self):
testdict = {
"": b"AAA\nBBB\nCCC\nX\rY\r\nZ",
"\n": b"AAA\nBBB\nCCC\nX\rY\r\nZ",
"\r": b"AAA\rBBB\rCCC\rX\rY\r\rZ",
"\r\n": b"AAA\r\nBBB\r\nCCC\r\nX\rY\r\r\nZ",
}
tests = [(None, testdict[os.linesep])] + sorted(testdict.items())
for newline, expected in tests:
buf = io.BytesIO()
txt = io.TextIOWrapper(buf, encoding="ascii", newline=newline)
txt.write("AAA\nB")
txt.write("BB\nCCC\n")
txt.write("X\rY\r\nZ")
txt.flush()
self.assertEquals(buf.closed, False)
self.assertEquals(buf.getvalue(), expected)
def testNewlines(self):
input_lines = [ "unix\n", "windows\r\n", "os9\r", "last\n", "nonl" ]
tests = [
[ None, [ 'unix\n', 'windows\n', 'os9\n', 'last\n', 'nonl' ] ],
[ '', input_lines ],
[ '\n', [ "unix\n", "windows\r\n", "os9\rlast\n", "nonl" ] ],
[ '\r\n', [ "unix\nwindows\r\n", "os9\rlast\nnonl" ] ],
[ '\r', [ "unix\nwindows\r", "\nos9\r", "last\nnonl" ] ],
]
encodings = (
'utf-8', 'latin-1',
'utf-16', 'utf-16-le', 'utf-16-be',
'utf-32', 'utf-32-le', 'utf-32-be',
)
# Try a range of buffer sizes to test the case where \r is the last
# character in TextIOWrapper._pending_line.
for encoding in encodings:
# XXX: str.encode() should return bytes
data = bytes(''.join(input_lines).encode(encoding))
for do_reads in (False, True):
for bufsize in range(1, 10):
for newline, exp_lines in tests:
bufio = io.BufferedReader(io.BytesIO(data), bufsize)
textio = io.TextIOWrapper(bufio, newline=newline,
encoding=encoding)
if do_reads:
got_lines = []
while True:
c2 = textio.read(2)
if c2 == '':
break
self.assertEquals(len(c2), 2)
got_lines.append(c2 + textio.readline())
else:
got_lines = list(textio)
for got_line, exp_line in zip(got_lines, exp_lines):
self.assertEquals(got_line, exp_line)
self.assertEquals(len(got_lines), len(exp_lines))
def testNewlinesInput(self):
testdata = b"AAA\nBBB\nCCC\rDDD\rEEE\r\nFFF\r\nGGG"
normalized = testdata.replace(b"\r\n", b"\n").replace(b"\r", b"\n")
for newline, expected in [
(None, normalized.decode("ascii").splitlines(True)),
("", testdata.decode("ascii").splitlines(True)),
("\n", ["AAA\n", "BBB\n", "CCC\rDDD\rEEE\r\n", "FFF\r\n", "GGG"]),
("\r\n", ["AAA\nBBB\nCCC\rDDD\rEEE\r\n", "FFF\r\n", "GGG"]),
("\r", ["AAA\nBBB\nCCC\r", "DDD\r", "EEE\r", "\nFFF\r", "\nGGG"]),
]:
buf = io.BytesIO(testdata)
txt = io.TextIOWrapper(buf, encoding="ascii", newline=newline)
self.assertEquals(txt.readlines(), expected)
txt.seek(0)
self.assertEquals(txt.read(), "".join(expected))
def testNewlinesOutput(self):
data = u"AAA\nBBB\rCCC\n"
data_lf = b"AAA\nBBB\rCCC\n"
data_cr = b"AAA\rBBB\rCCC\r"
data_crlf = b"AAA\r\nBBB\rCCC\r\n"
save_linesep = os.linesep
try:
for os.linesep, newline, expected in [
("\n", None, data_lf),
("\r\n", None, data_crlf),
("\n", "", data_lf),
("\r\n", "", data_lf),
("\n", "\n", data_lf),
("\r\n", "\n", data_lf),
("\n", "\r", data_cr),
("\r\n", "\r", data_cr),
("\n", "\r\n", data_crlf),
("\r\n", "\r\n", data_crlf),
]:
buf = io.BytesIO()
txt = io.TextIOWrapper(buf, encoding="ascii", newline=newline)
txt.write(data)
txt.close()
self.assertEquals(buf.closed, True)
self.assertRaises(ValueError, buf.getvalue)
finally:
os.linesep = save_linesep
# Systematic tests of the text I/O API
def testBasicIO(self):
for chunksize in (1, 2, 3, 4, 5, 15, 16, 17, 31, 32, 33, 63, 64, 65):
for enc in "ascii", "latin1", "utf8" :# , "utf-16-be", "utf-16-le":
f = io.open(test_support.TESTFN, "w+", encoding=enc)
f._CHUNK_SIZE = chunksize
self.assertEquals(f.write(u"abc"), 3)
f.close()
f = io.open(test_support.TESTFN, "r+", encoding=enc)
f._CHUNK_SIZE = chunksize
self.assertEquals(f.tell(), 0)
self.assertEquals(f.read(), u"abc")
cookie = f.tell()
self.assertEquals(f.seek(0), 0)
self.assertEquals(f.read(2), u"ab")
self.assertEquals(f.read(1), u"c")
self.assertEquals(f.read(1), u"")
self.assertEquals(f.read(), u"")
self.assertEquals(f.tell(), cookie)
self.assertEquals(f.seek(0), 0)
self.assertEquals(f.seek(0, 2), cookie)
self.assertEquals(f.write(u"def"), 3)
self.assertEquals(f.seek(cookie), cookie)
self.assertEquals(f.read(), u"def")
if enc.startswith("utf"):
self.multi_line_test(f, enc)
f.close()
def multi_line_test(self, f, enc):
f.seek(0)
f.truncate()
sample = u"s\xff\u0fff\uffff"
wlines = []
for size in (0, 1, 2, 3, 4, 5, 30, 31, 32, 33, 62, 63, 64, 65, 1000):
chars = []
for i in range(size):
chars.append(sample[i % len(sample)])
line = u"".join(chars) + u"\n"
wlines.append((f.tell(), line))
f.write(line)
f.seek(0)
rlines = []
while True:
pos = f.tell()
line = f.readline()
if not line:
break
rlines.append((pos, line))
self.assertEquals(rlines, wlines)
def testTelling(self):
f = io.open(test_support.TESTFN, "w+", encoding="utf8")
p0 = f.tell()
f.write(u"\xff\n")
p1 = f.tell()
f.write(u"\xff\n")
p2 = f.tell()
f.seek(0)
self.assertEquals(f.tell(), p0)
self.assertEquals(f.readline(), u"\xff\n")
self.assertEquals(f.tell(), p1)
self.assertEquals(f.readline(), u"\xff\n")
self.assertEquals(f.tell(), p2)
f.seek(0)
for line in f:
self.assertEquals(line, u"\xff\n")
self.assertRaises(IOError, f.tell)
self.assertEquals(f.tell(), p2)
f.close()
def testSeeking(self):
chunk_size = io.TextIOWrapper._CHUNK_SIZE
prefix_size = chunk_size - 2
u_prefix = "a" * prefix_size
prefix = bytes(u_prefix.encode("utf-8"))
self.assertEquals(len(u_prefix), len(prefix))
u_suffix = "\u8888\n"
suffix = bytes(u_suffix.encode("utf-8"))
line = prefix + suffix
f = io.open(test_support.TESTFN, "wb")
f.write(line*2)
f.close()
f = io.open(test_support.TESTFN, "r", encoding="utf-8")
s = f.read(prefix_size)
self.assertEquals(s, unicode(prefix, "ascii"))
self.assertEquals(f.tell(), prefix_size)
self.assertEquals(f.readline(), u_suffix)
def testSeekingToo(self):
# Regression test for a specific bug
data = b'\xe0\xbf\xbf\n'
f = io.open(test_support.TESTFN, "wb")
f.write(data)
f.close()
f = io.open(test_support.TESTFN, "r", encoding="utf-8")
f._CHUNK_SIZE # Just test that it exists
f._CHUNK_SIZE = 2
f.readline()
f.tell()
def testSeekAndTell(self):
"""Test seek/tell using the StatefulIncrementalDecoder."""
def testSeekAndTellWithData(data, min_pos=0):
"""Tell/seek to various points within a data stream and ensure
that the decoded data returned by read() is consistent."""
f = io.open(test_support.TESTFN, 'wb')
f.write(data)
f.close()
f = io.open(test_support.TESTFN, encoding='test_decoder')
decoded = f.read()
f.close()
for i in range(min_pos, len(decoded) + 1): # seek positions
for j in [1, 5, len(decoded) - i]: # read lengths
f = io.open(test_support.TESTFN, encoding='test_decoder')
self.assertEquals(f.read(i), decoded[:i])
cookie = f.tell()
self.assertEquals(f.read(j), decoded[i:i + j])
f.seek(cookie)
self.assertEquals(f.read(), decoded[i:])
f.close()
# Enable the test decoder.
StatefulIncrementalDecoder.codecEnabled = 1
# Run the tests.
try:
# Try each test case.
for input, _, _ in StatefulIncrementalDecoderTest.test_cases:
testSeekAndTellWithData(input)
# Position each test case so that it crosses a chunk boundary.
CHUNK_SIZE = io.TextIOWrapper._CHUNK_SIZE
for input, _, _ in StatefulIncrementalDecoderTest.test_cases:
offset = CHUNK_SIZE - len(input)//2
prefix = b'.'*offset
# Don't bother seeking into the prefix (takes too long).
min_pos = offset*2
testSeekAndTellWithData(prefix + input, min_pos)
# Ensure our test decoder won't interfere with subsequent tests.
finally:
StatefulIncrementalDecoder.codecEnabled = 0
def testEncodedWrites(self):
data = u"1234567890"
tests = ("utf-16",
"utf-16-le",
"utf-16-be",
"utf-32",
"utf-32-le",
"utf-32-be")
for encoding in tests:
buf = io.BytesIO()
f = io.TextIOWrapper(buf, encoding=encoding)
# Check if the BOM is written only once (see issue1753).
f.write(data)
f.write(data)
f.seek(0)
self.assertEquals(f.read(), data * 2)
self.assertEquals(buf.getvalue(), (data * 2).encode(encoding))
def timingTest(self):
timer = time.time
enc = "utf8"
line = "\0\x0f\xff\u0fff\uffff\U000fffff\U0010ffff"*3 + "\n"
nlines = 10000
nchars = len(line)
nbytes = len(line.encode(enc))
for chunk_size in (32, 64, 128, 256):
f = io.open(test_support.TESTFN, "w+", encoding=enc)
f._CHUNK_SIZE = chunk_size
t0 = timer()
for i in range(nlines):
f.write(line)
f.flush()
t1 = timer()
f.seek(0)
for line in f:
pass
t2 = timer()
f.seek(0)
while f.readline():
pass
t3 = timer()
f.seek(0)
while f.readline():
f.tell()
t4 = timer()
f.close()
if test_support.verbose:
print("\nTiming test: %d lines of %d characters (%d bytes)" %
(nlines, nchars, nbytes))
print("File chunk size: %6s" % f._CHUNK_SIZE)
print("Writing: %6.3f seconds" % (t1-t0))
print("Reading using iteration: %6.3f seconds" % (t2-t1))
print("Reading using readline(): %6.3f seconds" % (t3-t2))
print("Using readline()+tell(): %6.3f seconds" % (t4-t3))
def testReadOneByOne(self):
txt = io.TextIOWrapper(io.BytesIO(b"AA\r\nBB"))
reads = ""
while True:
c = txt.read(1)
if not c:
break
reads += c
self.assertEquals(reads, "AA\nBB")
# read in amounts equal to TextIOWrapper._CHUNK_SIZE which is 128.
def testReadByChunk(self):
# make sure "\r\n" straddles 128 char boundary.
txt = io.TextIOWrapper(io.BytesIO(b"A" * 127 + b"\r\nB"))
reads = ""
while True:
c = txt.read(128)
if not c:
break
reads += c
self.assertEquals(reads, "A"*127+"\nB")
def test_issue1395_1(self):
txt = io.TextIOWrapper(io.BytesIO(self.testdata), encoding="ascii")
# read one char at a time
reads = ""
while True:
c = txt.read(1)
if not c:
break
reads += c
self.assertEquals(reads, self.normalized)
def test_issue1395_2(self):
txt = io.TextIOWrapper(io.BytesIO(self.testdata), encoding="ascii")
txt._CHUNK_SIZE = 4
reads = ""
while True:
c = txt.read(4)
if not c:
break
reads += c
self.assertEquals(reads, self.normalized)
def test_issue1395_3(self):
txt = io.TextIOWrapper(io.BytesIO(self.testdata), encoding="ascii")
txt._CHUNK_SIZE = 4
reads = txt.read(4)
reads += txt.read(4)
reads += txt.readline()
reads += txt.readline()
reads += txt.readline()
self.assertEquals(reads, self.normalized)
def test_issue1395_4(self):
txt = io.TextIOWrapper(io.BytesIO(self.testdata), encoding="ascii")
txt._CHUNK_SIZE = 4
reads = txt.read(4)
reads += txt.read()
self.assertEquals(reads, self.normalized)
def test_issue1395_5(self):
txt = io.TextIOWrapper(io.BytesIO(self.testdata), encoding="ascii")
txt._CHUNK_SIZE = 4
reads = txt.read(4)
pos = txt.tell()
txt.seek(0)
txt.seek(pos)
self.assertEquals(txt.read(4), "BBB\n")
def test_issue2282(self):
buffer = io.BytesIO(self.testdata)
txt = io.TextIOWrapper(buffer, encoding="ascii")
self.assertEqual(buffer.seekable(), txt.seekable())
def check_newline_decoder_utf8(self, decoder):
# UTF-8 specific tests for a newline decoder
def _check_decode(b, s, **kwargs):
# We exercise getstate() / setstate() as well as decode()
state = decoder.getstate()
self.assertEquals(decoder.decode(b, **kwargs), s)
decoder.setstate(state)
self.assertEquals(decoder.decode(b, **kwargs), s)
_check_decode(b'\xe8\xa2\x88', "\u8888")
_check_decode(b'\xe8', "")
_check_decode(b'\xa2', "")
_check_decode(b'\x88', "\u8888")
_check_decode(b'\xe8', "")
_check_decode(b'\xa2', "")
_check_decode(b'\x88', "\u8888")
_check_decode(b'\xe8', "")
self.assertRaises(UnicodeDecodeError, decoder.decode, b'', final=True)
decoder.reset()
_check_decode(b'\n', "\n")
_check_decode(b'\r', "")
_check_decode(b'', "\n", final=True)
_check_decode(b'\r', "\n", final=True)
_check_decode(b'\r', "")
_check_decode(b'a', "\na")
_check_decode(b'\r\r\n', "\n\n")
_check_decode(b'\r', "")
_check_decode(b'\r', "\n")
_check_decode(b'\na', "\na")
_check_decode(b'\xe8\xa2\x88\r\n', "\u8888\n")
_check_decode(b'\xe8\xa2\x88', "\u8888")
_check_decode(b'\n', "\n")
_check_decode(b'\xe8\xa2\x88\r', "\u8888")
_check_decode(b'\n', "\n")
def check_newline_decoder(self, decoder, encoding):
result = []
encoder = codecs.getincrementalencoder(encoding)()
def _decode_bytewise(s):
for b in encoder.encode(s):
result.append(decoder.decode(b))
self.assertEquals(decoder.newlines, None)
_decode_bytewise("abc\n\r")
self.assertEquals(decoder.newlines, '\n')
_decode_bytewise("\nabc")
self.assertEquals(decoder.newlines, ('\n', '\r\n'))
_decode_bytewise("abc\r")
self.assertEquals(decoder.newlines, ('\n', '\r\n'))
_decode_bytewise("abc")
self.assertEquals(decoder.newlines, ('\r', '\n', '\r\n'))
_decode_bytewise("abc\r")
self.assertEquals("".join(result), "abc\n\nabcabc\nabcabc")
decoder.reset()
self.assertEquals(decoder.decode("abc".encode(encoding)), "abc")
self.assertEquals(decoder.newlines, None)
def test_newline_decoder(self):
encodings = (
'utf-8', 'latin-1',
'utf-16', 'utf-16-le', 'utf-16-be',
'utf-32', 'utf-32-le', 'utf-32-be',
)
for enc in encodings:
decoder = codecs.getincrementaldecoder(enc)()
decoder = io.IncrementalNewlineDecoder(decoder, translate=True)
self.check_newline_decoder(decoder, enc)
decoder = codecs.getincrementaldecoder("utf-8")()
decoder = io.IncrementalNewlineDecoder(decoder, translate=True)
self.check_newline_decoder_utf8(decoder)
def test_flush_error_on_close(self):
txt = io.TextIOWrapper(io.BytesIO(self.testdata), encoding="ascii")
def bad_flush():
raise IOError()
txt.flush = bad_flush
self.assertRaises(IOError, txt.close) # exception not swallowed
def test_multi_close(self):
txt = io.TextIOWrapper(io.BytesIO(self.testdata), encoding="ascii")
txt.close()
txt.close()
txt.close()
self.assertRaises(ValueError, txt.flush)
# XXX Tests for open()
class MiscIOTest(unittest.TestCase):
def tearDown(self):
test_support.unlink(test_support.TESTFN)
def testImport__all__(self):
for name in io.__all__:
obj = getattr(io, name, None)
self.assert_(obj is not None, name)
if name == "open":
continue
elif "error" in name.lower():
self.assert_(issubclass(obj, Exception), name)
else:
self.assert_(issubclass(obj, io.IOBase))
def test_attributes(self):
f = io.open(test_support.TESTFN, "wb", buffering=0)
self.assertEquals(f.mode, "wb")
f.close()
f = io.open(test_support.TESTFN, "U")
self.assertEquals(f.name, test_support.TESTFN)
self.assertEquals(f.buffer.name, test_support.TESTFN)
self.assertEquals(f.buffer.raw.name, test_support.TESTFN)
self.assertEquals(f.mode, "U")
self.assertEquals(f.buffer.mode, "rb")
self.assertEquals(f.buffer.raw.mode, "rb")
f.close()
f = io.open(test_support.TESTFN, "w+")
self.assertEquals(f.mode, "w+")
self.assertEquals(f.buffer.mode, "rb+") # Does it really matter?
self.assertEquals(f.buffer.raw.mode, "rb+")
g = io.open(f.fileno(), "wb", closefd=False)
self.assertEquals(g.mode, "wb")
self.assertEquals(g.raw.mode, "wb")
self.assertEquals(g.name, f.fileno())
self.assertEquals(g.raw.name, f.fileno())
f.close()
g.close()
def test_main():
test_support.run_unittest(IOTest, BytesIOTest, StringIOTest,
BufferedReaderTest, BufferedWriterTest,
BufferedRWPairTest, BufferedRandomTest,
StatefulIncrementalDecoderTest,
TextIOWrapperTest, MiscIOTest)
if __name__ == "__main__":
unittest.main()
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