mirror of https://github.com/python/cpython
229 lines
6.4 KiB
Python
229 lines
6.4 KiB
Python
'''
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Tests for fileinput module.
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Nick Mathewson
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'''
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from test.test_support import verify, verbose, TESTFN, TestFailed
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import sys, os, re
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from StringIO 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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pat = re.compile(r'LINE (\d+) OF FILE (\d+)')
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def remove_tempfiles(*names):
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for name in names:
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try:
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os.unlink(name)
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except:
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pass
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def runTests(t1, t2, t3, t4, bs=0, round=0):
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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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verify(len(lines) == 31)
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verify(lines[4] == 'Line 5 of file 1\n')
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verify(lines[30] == 'Line 1 of file 4\n')
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verify(fi.lineno() == 31)
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verify(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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verify(fi.filename() == t2)
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verify(fi.lineno() == 21)
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verify(fi.filelineno() == 6)
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verify(not fi.isfirstline())
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verify(not 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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verify(fi.readline() == 'Line 1 of file 3\n')
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verify(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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verify(len(lines) == 33)
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verify(lines[32] == 'Line 2 of stdin\n')
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verify(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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verify(fi.lineno() == 0)
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verify(fi.filename() == None)
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fi.nextfile()
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verify(fi.lineno() == 0)
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verify(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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verify(line[-1] == '\n')
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m = pat.match(line[:-1])
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verify(m != None)
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verify(int(m.group(1)) == fi.filelineno())
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fi.close()
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def writeFiles():
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global t1, t2, t3, t4
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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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# 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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try:
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writeFiles()
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runTests(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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# Next, check for proper behavior with 0-byte files.
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if verbose:
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print("13. 0-byte files")
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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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verify(line == 'The only line there is.\n')
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verify(fi.lineno() == 1)
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verify(fi.filelineno() == 1)
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verify(fi.filename() == t3)
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line = fi.readline()
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verify(not line)
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verify(fi.lineno() == 1)
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verify(fi.filelineno() == 0)
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verify(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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if verbose:
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print("14. Files that don't end with newline")
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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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verify(lines == ["A\n", "B\n", "C", "D\n", "E\n", "F"])
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verify(fi.filelineno() == 3)
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verify(fi.lineno() == 6)
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finally:
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remove_tempfiles(t1, t2)
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if verbose:
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print("15. Unicode filenames")
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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=unicode(t1, encoding))
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lines = list(fi)
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verify(lines == ["A\n", "B"])
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finally:
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remove_tempfiles(t1)
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if verbose:
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print("16. fileno()")
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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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verify(fi.fileno() == -1)
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line = next(fi)
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verify(fi.fileno() != -1)
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fi.nextfile()
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verify(fi.fileno() == -1)
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line = list(fi)
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verify(fi.fileno() == -1)
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finally:
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remove_tempfiles(t1, t2)
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if verbose:
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print("17. Specify opening mode")
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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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raise TestFailed("FileInput should reject invalid mode argument")
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except ValueError:
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pass
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try:
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# try opening in universal newline mode
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t1 = writeTmp(1, ["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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verify(lines == ["A\n", "B\n", "C\n", "D"])
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finally:
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remove_tempfiles(t1)
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if verbose:
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print("18. Test file opening hook")
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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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raise TestFailed("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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raise TestFailed("FileInput should check openhook for being callable")
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except ValueError:
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pass
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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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verify(lines == ["N\n", "O"])
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finally:
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remove_tempfiles(t1)
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