# Tests universal newline support for both reading and parsing files.
# NOTE: this file tests the new `io` library backported from Python 3.x.
# Similar tests for the builtin file object can be found in test_univnewlines2k.py.
from __future__ import print_function
from __future__ import unicode_literals
import io
import _pyio as pyio
import unittest
import os
import sys
from test import test_support as support
if not hasattr(sys.stdin, 'newlines'):
raise unittest.SkipTest(
"This Python does not have universal newline support")
FATX = 'x' * (2**14)
DATA_TEMPLATE = [
"line1=1",
"line2='this is a very long line designed to go past any default " +
"buffer limits that exist in io.py but we also want to test " +
"the uncommon case, naturally.'",
"def line3():pass",
"line4 = '%s'" % FATX,
]
DATA_LF = "\n".join(DATA_TEMPLATE) + "\n"
DATA_CR = "\r".join(DATA_TEMPLATE) + "\r"
DATA_CRLF = "\r\n".join(DATA_TEMPLATE) + "\r\n"
# Note that DATA_MIXED also tests the ability to recognize a lone \r
# before end-of-file.
DATA_MIXED = "\n".join(DATA_TEMPLATE) + "\r"
DATA_SPLIT = [x + "\n" for x in DATA_TEMPLATE]
class TestGenericUnivNewlines(unittest.TestCase):
# use a class variable DATA to define the data to write to the file
# and a class variable NEWLINE to set the expected newlines value
READMODE = 'r'
WRITEMODE = 'wb'
def setUp(self):
data = self.DATA
if "b" in self.WRITEMODE:
data = data.encode("ascii")
with self.open(support.TESTFN, self.WRITEMODE) as fp:
fp.write(data)
def tearDown(self):
try:
os.unlink(support.TESTFN)
except:
pass
def test_read(self):
with self.open(support.TESTFN, self.READMODE) as fp:
data = fp.read()
self.assertEqual(data, DATA_LF)
self.assertEqual(set(fp.newlines), set(self.NEWLINE))
def test_readlines(self):
with self.open(support.TESTFN, self.READMODE) as fp:
data = fp.readlines()
self.assertEqual(data, DATA_SPLIT)
self.assertEqual(set(fp.newlines), set(self.NEWLINE))
def test_readline(self):
with self.open(support.TESTFN, self.READMODE) as fp:
data = []
d = fp.readline()
while d:
data.append(d)
d = fp.readline()
self.assertEqual(data, DATA_SPLIT)
self.assertEqual(set(fp.newlines), set(self.NEWLINE))
def test_seek(self):
with self.open(support.TESTFN, self.READMODE) as fp:
fp.readline()
pos = fp.tell()
data = fp.readlines()
self.assertEqual(data, DATA_SPLIT[1:])
fp.seek(pos)
data = fp.readlines()
self.assertEqual(data, DATA_SPLIT[1:])
class TestCRNewlines(TestGenericUnivNewlines):
NEWLINE = '\r'
DATA = DATA_CR
class TestLFNewlines(TestGenericUnivNewlines):
NEWLINE = '\n'
DATA = DATA_LF
class TestCRLFNewlines(TestGenericUnivNewlines):
NEWLINE = '\r\n'
DATA = DATA_CRLF
def test_tell(self):
with self.open(support.TESTFN, self.READMODE) as fp:
self.assertEqual(repr(fp.newlines), repr(None))
data = fp.readline()
pos = fp.tell()
self.assertEqual(repr(fp.newlines), repr(self.NEWLINE))
class TestMixedNewlines(TestGenericUnivNewlines):
NEWLINE = ('\r', '\n')
DATA = DATA_MIXED
def test_main():
base_tests = (TestCRNewlines,
TestLFNewlines,
TestCRLFNewlines,
TestMixedNewlines)
tests = []
# Test the C and Python implementations.
for test in base_tests:
class CTest(test):
open = io.open
CTest.__name__ = str("C" + test.__name__)
class PyTest(test):
open = staticmethod(pyio.open)
PyTest.__name__ = str("Py" + test.__name__)
tests.append(CTest)
tests.append(PyTest)
support.run_unittest(*tests)
if __name__ == '__main__':
test_main()