lib-python.2.7.test.test_fileinput.py Maven / Gradle / Ivy
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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
'''
Tests for fileinput module.
Nick Mathewson
'''
import unittest
from test.test_support import verbose, TESTFN, run_unittest
from test.test_support import unlink as safe_unlink
import sys, re
from StringIO import StringIO
from fileinput import FileInput, hook_encoded
# The fileinput module has 2 interfaces: the FileInput class which does
# all the work, and a few functions (input, etc.) that use a global _state
# variable. We only test the FileInput class, since the other functions
# only provide a thin facade over FileInput.
# Write lines (a list of lines) to temp file number i, and return the
# temp file's name.
def writeTmp(i, lines, mode='w'): # opening in text mode is the default
name = TESTFN + str(i)
f = open(name, mode)
f.writelines(lines)
f.close()
return name
def remove_tempfiles(*names):
for name in names:
safe_unlink(name)
class BufferSizesTests(unittest.TestCase):
def test_buffer_sizes(self):
# First, run the tests with default and teeny buffer size.
for round, bs in (0, 0), (1, 30):
try:
t1 = writeTmp(1, ["Line %s of file 1\n" % (i+1) for i in range(15)])
t2 = writeTmp(2, ["Line %s of file 2\n" % (i+1) for i in range(10)])
t3 = writeTmp(3, ["Line %s of file 3\n" % (i+1) for i in range(5)])
t4 = writeTmp(4, ["Line %s of file 4\n" % (i+1) for i in range(1)])
self.buffer_size_test(t1, t2, t3, t4, bs, round)
finally:
remove_tempfiles(t1, t2, t3, t4)
def buffer_size_test(self, t1, t2, t3, t4, bs=0, round=0):
pat = re.compile(r'LINE (\d+) OF FILE (\d+)')
start = 1 + round*6
if verbose:
print '%s. Simple iteration (bs=%s)' % (start+0, bs)
fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
lines = list(fi)
fi.close()
self.assertEqual(len(lines), 31)
self.assertEqual(lines[4], 'Line 5 of file 1\n')
self.assertEqual(lines[30], 'Line 1 of file 4\n')
self.assertEqual(fi.lineno(), 31)
self.assertEqual(fi.filename(), t4)
if verbose:
print '%s. Status variables (bs=%s)' % (start+1, bs)
fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
s = "x"
while s and s != 'Line 6 of file 2\n':
s = fi.readline()
self.assertEqual(fi.filename(), t2)
self.assertEqual(fi.lineno(), 21)
self.assertEqual(fi.filelineno(), 6)
self.assertFalse(fi.isfirstline())
self.assertFalse(fi.isstdin())
if verbose:
print '%s. Nextfile (bs=%s)' % (start+2, bs)
fi.nextfile()
self.assertEqual(fi.readline(), 'Line 1 of file 3\n')
self.assertEqual(fi.lineno(), 22)
fi.close()
if verbose:
print '%s. Stdin (bs=%s)' % (start+3, bs)
fi = FileInput(files=(t1, t2, t3, t4, '-'), bufsize=bs)
savestdin = sys.stdin
try:
sys.stdin = StringIO("Line 1 of stdin\nLine 2 of stdin\n")
lines = list(fi)
self.assertEqual(len(lines), 33)
self.assertEqual(lines[32], 'Line 2 of stdin\n')
self.assertEqual(fi.filename(), '')
fi.nextfile()
finally:
sys.stdin = savestdin
if verbose:
print '%s. Boundary conditions (bs=%s)' % (start+4, bs)
fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
self.assertEqual(fi.lineno(), 0)
self.assertEqual(fi.filename(), None)
fi.nextfile()
self.assertEqual(fi.lineno(), 0)
self.assertEqual(fi.filename(), None)
if verbose:
print '%s. Inplace (bs=%s)' % (start+5, bs)
savestdout = sys.stdout
try:
fi = FileInput(files=(t1, t2, t3, t4), inplace=1, bufsize=bs)
for line in fi:
line = line[:-1].upper()
print line
fi.close()
finally:
sys.stdout = savestdout
fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
for line in fi:
self.assertEqual(line[-1], '\n')
m = pat.match(line[:-1])
self.assertNotEqual(m, None)
self.assertEqual(int(m.group(1)), fi.filelineno())
fi.close()
class FileInputTests(unittest.TestCase):
def test_zero_byte_files(self):
try:
t1 = writeTmp(1, [""])
t2 = writeTmp(2, [""])
t3 = writeTmp(3, ["The only line there is.\n"])
t4 = writeTmp(4, [""])
fi = FileInput(files=(t1, t2, t3, t4))
line = fi.readline()
self.assertEqual(line, 'The only line there is.\n')
self.assertEqual(fi.lineno(), 1)
self.assertEqual(fi.filelineno(), 1)
self.assertEqual(fi.filename(), t3)
line = fi.readline()
self.assertFalse(line)
self.assertEqual(fi.lineno(), 1)
self.assertEqual(fi.filelineno(), 0)
self.assertEqual(fi.filename(), t4)
fi.close()
finally:
remove_tempfiles(t1, t2, t3, t4)
def test_files_that_dont_end_with_newline(self):
try:
t1 = writeTmp(1, ["A\nB\nC"])
t2 = writeTmp(2, ["D\nE\nF"])
fi = FileInput(files=(t1, t2))
lines = list(fi)
self.assertEqual(lines, ["A\n", "B\n", "C", "D\n", "E\n", "F"])
self.assertEqual(fi.filelineno(), 3)
self.assertEqual(fi.lineno(), 6)
finally:
remove_tempfiles(t1, t2)
def test_unicode_filenames(self):
try:
t1 = writeTmp(1, ["A\nB"])
encoding = sys.getfilesystemencoding()
if encoding is None:
encoding = 'ascii'
fi = FileInput(files=unicode(t1, encoding))
lines = list(fi)
self.assertEqual(lines, ["A\n", "B"])
finally:
remove_tempfiles(t1)
def test_fileno(self):
try:
t1 = writeTmp(1, ["A\nB"])
t2 = writeTmp(2, ["C\nD"])
fi = FileInput(files=(t1, t2))
self.assertEqual(fi.fileno(), -1)
line = fi.next()
self.assertNotEqual(fi.fileno(), -1)
fi.nextfile()
self.assertEqual(fi.fileno(), -1)
line = list(fi)
self.assertEqual(fi.fileno(), -1)
finally:
remove_tempfiles(t1, t2)
def test_opening_mode(self):
try:
# invalid mode, should raise ValueError
fi = FileInput(mode="w")
self.fail("FileInput should reject invalid mode argument")
except ValueError:
pass
try:
# try opening in universal newline mode
t1 = writeTmp(1, ["A\nB\r\nC\rD"], mode="wb")
fi = FileInput(files=t1, mode="U")
lines = list(fi)
self.assertEqual(lines, ["A\n", "B\n", "C\n", "D"])
finally:
remove_tempfiles(t1)
def test_file_opening_hook(self):
try:
# cannot use openhook and inplace mode
fi = FileInput(inplace=1, openhook=lambda f,m: None)
self.fail("FileInput should raise if both inplace "
"and openhook arguments are given")
except ValueError:
pass
try:
fi = FileInput(openhook=1)
self.fail("FileInput should check openhook for being callable")
except ValueError:
pass
try:
t1 = writeTmp(1, ["A\nB"], mode="wb")
fi = FileInput(files=t1, openhook=hook_encoded("rot13"))
lines = list(fi)
self.assertEqual(lines, ["N\n", "O"])
finally:
remove_tempfiles(t1)
def test_main():
run_unittest(BufferSizesTests, FileInputTests)
if __name__ == "__main__":
test_main()