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# Copyright 1999 by Jeffrey Chang. All rights reserved.
# This code is part of the Biopython distribution and governed by its
# license. Please see the LICENSE file that should have been included
# as part of this package.
from __future__ import print_function
import os.path
import unittest
import shutil
from Bio._py3k import StringIO
import tempfile
from Bio import File
data = """This
is
a multi-line
file"""
### UndoHandle
h = File.UndoHandle(StringIO(data))
print(h.readline()) # 'This'
print(h.peekline()) # 'is'
print(h.readline()) # 'is'
h.saveline("saved")
print(h.peekline()) # 'saved'
h.saveline("another")
print(h.readline()) # 'another'
print(h.readline()) # 'saved'
# Test readlines after saveline
h.saveline("saved again")
lines = h.readlines()
print(repr(lines[0])) # 'saved again'
print(repr(lines[1])) # 'a multi-line'
print(repr(lines[2])) # 'file'
# should be empty now
print(repr(h.readline())) # ''
h.saveline("save after empty")
print(h.readline()) # 'save after empty'
print(repr(h.readline())) # ''
# test read method
h = File.UndoHandle(StringIO("some text"))
h.saveline("more text")
print(h.read()) # 'more textsome text'
class AsHandleTestCase(unittest.TestCase):
def setUp(self):
# Create a directory to work in
self.temp_dir = tempfile.mkdtemp(prefix='biopython-test')
def tearDown(self):
shutil.rmtree(self.temp_dir)
def _path(self, *args):
return os.path.join(self.temp_dir, *args)
def test_handle(self):
"Test as_handle with a file-like object argument"
p = self._path('test_file.fasta')
with open(p, 'wb') as fp:
with File.as_handle(fp) as handle:
self.assertEqual(fp, handle, "as_handle should "
"return argument when given a file-like object")
self.assertFalse(handle.closed)
self.assertFalse(handle.closed,
"Exiting as_handle given a file-like object should not "
"close the file")
def test_path(self):
"Test as_handle with a path argument"
p = self._path('test_file.fasta')
mode = 'wb'
with File.as_handle(p, mode=mode) as handle:
self.assertEqual(p, handle.name)
self.assertEqual(mode, handle.mode)
self.assertFalse(handle.closed)
self.assertTrue(handle.closed)
def test_stringio(self):
s = StringIO()
with File.as_handle(s) as handle:
self.assertEqual(s, handle)
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