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'''
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 io 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)
for line in lines:
f.write(line)
f.close()
return name
def remove_tempfiles(*names):
for name in names:
if name:
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.failIf(fi.isfirstline())
self.failIf(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(), '<stdin>')
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.failIf(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):
## # XXX A unicode string is always returned by writeTmp.
## # So is this needed?
## try:
## t1 = writeTmp(1, ["A\nB"])
## encoding = sys.getfilesystemencoding()
## if encoding is None:
## encoding = 'ascii'
## fi = FileInput(files=str(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 =next( fi)
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
t1 = None
try:
# try opening in universal newline mode
t1 = writeTmp(1, [b"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
# XXX The rot13 codec was removed.
# So this test needs to be changed to use something else.
# (Or perhaps the API needs to change so we can just pass
# an encoding rather than using a hook?)
## 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()
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