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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.
import os
import string
from Bio import File
data = """This
is
a multi-line
file"""
### StringHandle
h = File.StringHandle(data)
print repr(h.readline()) # 'This'
print len(h.readlines()) # 3
print repr(h.readline()) # ''
h.close()
### UndoHandle
h = File.UndoHandle(File.StringHandle(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(File.StringHandle("some text"))
h.saveline("more text")
print h.read() # 'more textsome text'
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