263 lines
9.1 KiB
Python
263 lines
9.1 KiB
Python
'''
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Tests for fileinput module.
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Nick Mathewson
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'''
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import unittest
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from test.support import verbose, TESTFN, run_unittest
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from test.support import unlink as safe_unlink
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import sys, re
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from io import StringIO
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from fileinput import FileInput, hook_encoded
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# The fileinput module has 2 interfaces: the FileInput class which does
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# all the work, and a few functions (input, etc.) that use a global _state
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# variable. We only test the FileInput class, since the other functions
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# only provide a thin facade over FileInput.
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# Write lines (a list of lines) to temp file number i, and return the
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# temp file's name.
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def writeTmp(i, lines, mode='w'): # opening in text mode is the default
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name = TESTFN + str(i)
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f = open(name, mode)
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for line in lines:
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f.write(line)
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f.close()
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return name
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def remove_tempfiles(*names):
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for name in names:
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if name:
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safe_unlink(name)
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class BufferSizesTests(unittest.TestCase):
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def test_buffer_sizes(self):
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# First, run the tests with default and teeny buffer size.
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for round, bs in (0, 0), (1, 30):
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t1 = t2 = t3 = t4 = None
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try:
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t1 = writeTmp(1, ["Line %s of file 1\n" % (i+1) for i in range(15)])
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t2 = writeTmp(2, ["Line %s of file 2\n" % (i+1) for i in range(10)])
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t3 = writeTmp(3, ["Line %s of file 3\n" % (i+1) for i in range(5)])
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t4 = writeTmp(4, ["Line %s of file 4\n" % (i+1) for i in range(1)])
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self.buffer_size_test(t1, t2, t3, t4, bs, round)
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finally:
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remove_tempfiles(t1, t2, t3, t4)
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def buffer_size_test(self, t1, t2, t3, t4, bs=0, round=0):
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pat = re.compile(r'LINE (\d+) OF FILE (\d+)')
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start = 1 + round*6
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if verbose:
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print('%s. Simple iteration (bs=%s)' % (start+0, bs))
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fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
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lines = list(fi)
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fi.close()
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self.assertEqual(len(lines), 31)
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self.assertEqual(lines[4], 'Line 5 of file 1\n')
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self.assertEqual(lines[30], 'Line 1 of file 4\n')
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self.assertEqual(fi.lineno(), 31)
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self.assertEqual(fi.filename(), t4)
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if verbose:
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print('%s. Status variables (bs=%s)' % (start+1, bs))
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fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
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s = "x"
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while s and s != 'Line 6 of file 2\n':
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s = fi.readline()
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self.assertEqual(fi.filename(), t2)
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self.assertEqual(fi.lineno(), 21)
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self.assertEqual(fi.filelineno(), 6)
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self.assertFalse(fi.isfirstline())
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self.assertFalse(fi.isstdin())
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if verbose:
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print('%s. Nextfile (bs=%s)' % (start+2, bs))
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fi.nextfile()
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self.assertEqual(fi.readline(), 'Line 1 of file 3\n')
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self.assertEqual(fi.lineno(), 22)
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fi.close()
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if verbose:
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print('%s. Stdin (bs=%s)' % (start+3, bs))
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fi = FileInput(files=(t1, t2, t3, t4, '-'), bufsize=bs)
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savestdin = sys.stdin
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try:
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sys.stdin = StringIO("Line 1 of stdin\nLine 2 of stdin\n")
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lines = list(fi)
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self.assertEqual(len(lines), 33)
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self.assertEqual(lines[32], 'Line 2 of stdin\n')
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self.assertEqual(fi.filename(), '<stdin>')
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fi.nextfile()
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finally:
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sys.stdin = savestdin
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if verbose:
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print('%s. Boundary conditions (bs=%s)' % (start+4, bs))
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fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
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self.assertEqual(fi.lineno(), 0)
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self.assertEqual(fi.filename(), None)
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fi.nextfile()
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self.assertEqual(fi.lineno(), 0)
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self.assertEqual(fi.filename(), None)
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if verbose:
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print('%s. Inplace (bs=%s)' % (start+5, bs))
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savestdout = sys.stdout
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try:
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fi = FileInput(files=(t1, t2, t3, t4), inplace=1, bufsize=bs)
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for line in fi:
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line = line[:-1].upper()
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print(line)
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fi.close()
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finally:
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sys.stdout = savestdout
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fi = FileInput(files=(t1, t2, t3, t4), bufsize=bs)
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for line in fi:
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self.assertEqual(line[-1], '\n')
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m = pat.match(line[:-1])
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self.assertNotEqual(m, None)
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self.assertEqual(int(m.group(1)), fi.filelineno())
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fi.close()
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class FileInputTests(unittest.TestCase):
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def test_zero_byte_files(self):
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t1 = t2 = t3 = t4 = None
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try:
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t1 = writeTmp(1, [""])
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t2 = writeTmp(2, [""])
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t3 = writeTmp(3, ["The only line there is.\n"])
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t4 = writeTmp(4, [""])
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fi = FileInput(files=(t1, t2, t3, t4))
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line = fi.readline()
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self.assertEqual(line, 'The only line there is.\n')
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self.assertEqual(fi.lineno(), 1)
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self.assertEqual(fi.filelineno(), 1)
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self.assertEqual(fi.filename(), t3)
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line = fi.readline()
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self.assertFalse(line)
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self.assertEqual(fi.lineno(), 1)
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self.assertEqual(fi.filelineno(), 0)
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self.assertEqual(fi.filename(), t4)
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fi.close()
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finally:
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remove_tempfiles(t1, t2, t3, t4)
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def test_files_that_dont_end_with_newline(self):
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t1 = t2 = None
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try:
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t1 = writeTmp(1, ["A\nB\nC"])
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t2 = writeTmp(2, ["D\nE\nF"])
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fi = FileInput(files=(t1, t2))
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lines = list(fi)
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self.assertEqual(lines, ["A\n", "B\n", "C", "D\n", "E\n", "F"])
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self.assertEqual(fi.filelineno(), 3)
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self.assertEqual(fi.lineno(), 6)
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finally:
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remove_tempfiles(t1, t2)
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## def test_unicode_filenames(self):
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## # XXX A unicode string is always returned by writeTmp.
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## # So is this needed?
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## try:
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## t1 = writeTmp(1, ["A\nB"])
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## encoding = sys.getfilesystemencoding()
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## if encoding is None:
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## encoding = 'ascii'
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## fi = FileInput(files=str(t1, encoding))
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## lines = list(fi)
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## self.assertEqual(lines, ["A\n", "B"])
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## finally:
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## remove_tempfiles(t1)
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def test_fileno(self):
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t1 = t2 = None
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try:
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t1 = writeTmp(1, ["A\nB"])
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t2 = writeTmp(2, ["C\nD"])
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fi = FileInput(files=(t1, t2))
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self.assertEqual(fi.fileno(), -1)
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line =next( fi)
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self.assertNotEqual(fi.fileno(), -1)
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fi.nextfile()
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self.assertEqual(fi.fileno(), -1)
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line = list(fi)
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self.assertEqual(fi.fileno(), -1)
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finally:
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remove_tempfiles(t1, t2)
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def test_opening_mode(self):
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try:
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# invalid mode, should raise ValueError
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fi = FileInput(mode="w")
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self.fail("FileInput should reject invalid mode argument")
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except ValueError:
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pass
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t1 = None
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try:
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# try opening in universal newline mode
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t1 = writeTmp(1, [b"A\nB\r\nC\rD"], mode="wb")
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fi = FileInput(files=t1, mode="U")
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lines = list(fi)
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self.assertEqual(lines, ["A\n", "B\n", "C\n", "D"])
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finally:
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remove_tempfiles(t1)
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def test_file_opening_hook(self):
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try:
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# cannot use openhook and inplace mode
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fi = FileInput(inplace=1, openhook=lambda f, m: None)
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self.fail("FileInput should raise if both inplace "
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"and openhook arguments are given")
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except ValueError:
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pass
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try:
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fi = FileInput(openhook=1)
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self.fail("FileInput should check openhook for being callable")
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except ValueError:
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pass
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# XXX The rot13 codec was removed.
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# So this test needs to be changed to use something else.
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# (Or perhaps the API needs to change so we can just pass
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# an encoding rather than using a hook?)
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## try:
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## t1 = writeTmp(1, ["A\nB"], mode="wb")
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## fi = FileInput(files=t1, openhook=hook_encoded("rot13"))
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## lines = list(fi)
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## self.assertEqual(lines, ["N\n", "O"])
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## finally:
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## remove_tempfiles(t1)
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def test_context_manager(self):
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try:
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t1 = writeTmp(1, ["A\nB\nC"])
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t2 = writeTmp(2, ["D\nE\nF"])
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with FileInput(files=(t1, t2)) as fi:
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lines = list(fi)
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self.assertEqual(lines, ["A\n", "B\n", "C", "D\n", "E\n", "F"])
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self.assertEqual(fi.filelineno(), 3)
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self.assertEqual(fi.lineno(), 6)
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self.assertEqual(fi._files, ())
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finally:
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remove_tempfiles(t1, t2)
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def test_close_on_exception(self):
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try:
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t1 = writeTmp(1, [""])
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with FileInput(files=t1) as fi:
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raise IOError
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except IOError:
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self.assertEqual(fi._files, ())
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finally:
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remove_tempfiles(t1)
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def test_main():
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run_unittest(BufferSizesTests, FileInputTests)
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if __name__ == "__main__":
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test_main()
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