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'''
Tests for fileinput module.
Nick Mathewson
'''
from test.test_support import verify, verbose, TESTFN, TestFailed
import sys, os, 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)
for line in lines:
f.write(line)
f.close()
return name
pat = re.compile(r'LINE (\d+) OF FILE (\d+)')
def remove_tempfiles(*names):
for name in names:
try:
os.unlink(name)
except:
pass
def runTests(t1, t2, t3, t4, bs=0, round=0):
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()
verify(len(lines) == 31)
verify(lines[4] == 'Line 5 of file 1\n')
verify(lines[30] == 'Line 1 of file 4\n')
verify(fi.lineno() == 31)
verify(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()
verify(fi.filename() == t2)
verify(fi.lineno() == 21)
verify(fi.filelineno() == 6)
verify(not fi.isfirstline())
verify(not fi.isstdin())
if verbose:
print('%s. Nextfile (bs=%s)' % (start+2, bs))
fi.nextfile()
verify(fi.readline() == 'Line 1 of file 3\n')
verify(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)
verify(len(lines) == 33)
verify(lines[32] == 'Line 2 of stdin\n')
verify(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)
verify(fi.lineno() == 0)
verify(fi.filename() == None)
fi.nextfile()
verify(fi.lineno() == 0)
verify(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:
verify(line[-1] == '\n')
m = pat.match(line[:-1])
verify(m != None)
verify(int(m.group(1)) == fi.filelineno())
fi.close()
def writeFiles():
global t1, t2, t3, t4
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)])
# First, run the tests with default and teeny buffer size.
for round, bs in (0, 0), (1, 30):
try:
writeFiles()
runTests(t1, t2, t3, t4, bs, round)
finally:
remove_tempfiles(t1, t2, t3, t4)
# Next, check for proper behavior with 0-byte files.
if verbose:
print("13. 0-byte files")
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()
verify(line == 'The only line there is.\n')
verify(fi.lineno() == 1)
verify(fi.filelineno() == 1)
verify(fi.filename() == t3)
line = fi.readline()
verify(not line)
verify(fi.lineno() == 1)
verify(fi.filelineno() == 0)
verify(fi.filename() == t4)
fi.close()
finally:
remove_tempfiles(t1, t2, t3, t4)
if verbose:
print("14. Files that don't end with newline")
try:
t1 = writeTmp(1, ["A\nB\nC"])
t2 = writeTmp(2, ["D\nE\nF"])
fi = FileInput(files=(t1, t2))
lines = list(fi)
verify(lines == ["A\n", "B\n", "C", "D\n", "E\n", "F"])
verify(fi.filelineno() == 3)
verify(fi.lineno() == 6)
finally:
remove_tempfiles(t1, t2)
if verbose:
print("15. Unicode filenames")
try:
t1 = writeTmp(1, ["A\nB"])
encoding = sys.getfilesystemencoding()
if encoding is None:
encoding = 'ascii'
fi = FileInput(files=unicode(t1, encoding))
lines = list(fi)
verify(lines == ["A\n", "B"])
finally:
remove_tempfiles(t1)
if verbose:
print("16. fileno()")
try:
t1 = writeTmp(1, ["A\nB"])
t2 = writeTmp(2, ["C\nD"])
fi = FileInput(files=(t1, t2))
verify(fi.fileno() == -1)
line = next(fi)
verify(fi.fileno() != -1)
fi.nextfile()
verify(fi.fileno() == -1)
line = list(fi)
verify(fi.fileno() == -1)
finally:
remove_tempfiles(t1, t2)
if verbose:
print("17. Specify opening mode")
try:
# invalid mode, should raise ValueError
fi = FileInput(mode="w")
raise TestFailed("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)
verify(lines == ["A\n", "B\n", "C\n", "D"])
finally:
remove_tempfiles(t1)
if verbose:
print("18. Test file opening hook")
try:
# cannot use openhook and inplace mode
fi = FileInput(inplace=1, openhook=lambda f,m: None)
raise TestFailed("FileInput should raise if both inplace "
"and openhook arguments are given")
except ValueError:
pass
try:
fi = FileInput(openhook=1)
raise TestFailed("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)
verify(lines == ["N\n", "O"])
finally:
remove_tempfiles(t1)
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