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# Copyright (C) 2008 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""The python implementation of chunks_to_lines"""
from __future__ import absolute_import
def chunks_to_lines(chunks):
"""Re-split chunks into simple lines.
Each entry in the result should contain a single newline at the end. Except
for the last entry which may not have a final newline. If chunks is already
a simple list of lines, we return it directly.
:param chunks: An list/tuple of strings. If chunks is already a list of
lines, then we will return it as-is.
:return: A list of strings.
"""
# Optimize for a very common case when chunks are already lines
last_no_newline = False
for chunk in chunks:
if last_no_newline:
# Only the last chunk is allowed to not have a trailing newline
# Getting here means the last chunk didn't have a newline, and we
# have a chunk following it
break
if not chunk:
# Empty strings are never valid lines
break
elif '\n' in chunk[:-1]:
# This chunk has an extra '\n', so we will have to split it
break
elif chunk[-1] != '\n':
# This chunk does not have a trailing newline
last_no_newline = True
else:
# All of the lines (but possibly the last) have a single newline at the
# end of the string.
# For the last one, we allow it to not have a trailing newline, but it
# is not allowed to be an empty string.
return chunks
# These aren't simple lines, just join and split again.
from bzrlib import osutils
return osutils._split_lines(''.join(chunks))
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