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#!/usr/bin/env python3
#
# Copyright 2021 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""A script to do source transformations to create a new LTS release.
Usage: ./create_lts.py YYYYMMDD
"""
import sys
def ReplaceStringsInFile(filename, replacement_dict):
"""Performs textual replacements in a file.
Rewrites filename with the keys in replacement_dict replaced with
their values. This function assumes the file can fit in memory.
Args:
filename: the filename to perform the replacement on
replacement_dict: a dictionary of key strings to be replaced with their
values
Raises:
Exception: A failure occured
"""
f = open(filename, 'r')
content = f.read()
f.close()
for key, value in replacement_dict.items():
original = content
content = content.replace(key, value)
if content == original:
raise Exception('Failed to find {} in {}'.format(key, filename))
f = open(filename, 'w')
f.write(content)
f.close()
def StripContentBetweenTags(filename, strip_begin_tag, strip_end_tag):
"""Strip contents from a file.
Rewrites filename with by removing all content between
strip_begin_tag and strip_end_tag, including the tags themselves.
Args:
filename: the filename to perform the replacement on
strip_begin_tag: the start of the content to be removed
strip_end_tag: the end of the content to be removed
Raises:
Exception: A failure occured
"""
f = open(filename, 'r')
content = f.read()
f.close()
while True:
begin = content.find(strip_begin_tag)
if begin == -1:
break
end = content.find(strip_end_tag, begin + len(strip_begin_tag))
if end == -1:
raise Exception('{}: imbalanced strip begin ({}) and '
'end ({}) tags'.format(filename, strip_begin_tag,
strip_end_tag))
content = content.replace(content[begin:end + len(strip_end_tag)], '')
f = open(filename, 'w')
f.write(content)
f.close()
def main(argv):
if len(argv) != 2:
print('Usage: {} YYYYMMDD'.format(sys.argv[0], file=sys.stderr))
sys.exit(1)
datestamp = sys.argv[1]
if len(datestamp) != 8 or not datestamp.isdigit():
raise Exception(
'datestamp={} is not in the YYYYMMDD format'.format(datestamp))
# Replacement directives go here.
ReplaceStringsInFile(
'absl/base/config.h', {
'#undef ABSL_LTS_RELEASE_VERSION':
'#define ABSL_LTS_RELEASE_VERSION {}'.format(datestamp),
'#undef ABSL_LTS_RELEASE_PATCH_LEVEL':
'#define ABSL_LTS_RELEASE_PATCH_LEVEL 0'
})
ReplaceStringsInFile(
'absl/base/options.h', {
'#define ABSL_OPTION_USE_INLINE_NAMESPACE 0':
'#define ABSL_OPTION_USE_INLINE_NAMESPACE 1',
'#define ABSL_OPTION_INLINE_NAMESPACE_NAME head':
'#define ABSL_OPTION_INLINE_NAMESPACE_NAME lts_{}'.format(
datestamp)
})
ReplaceStringsInFile(
'CMakeLists.txt', {
'project(absl LANGUAGES CXX)':
'project(absl LANGUAGES CXX VERSION {})'.format(datestamp)
})
# Set the SOVERSION to YYMM.0.0 - The first 0 means we only have ABI
# compatible changes, and the second 0 means we can increment it to
# mark changes as ABI-compatible, for patch releases. Note that we
# only use the last two digits of the year and the month because the
# MacOS linker requires the first part of the SOVERSION to fit into
# 16 bits.
# https://www.sicpers.info/2013/03/how-to-version-a-mach-o-library/
ReplaceStringsInFile(
'CMake/AbseilHelpers.cmake',
{'SOVERSION 0': 'SOVERSION "{}.0.0"'.format(datestamp[2:6])})
StripContentBetweenTags('CMakeLists.txt', '# absl:lts-remove-begin',
'# absl:lts-remove-end')
if __name__ == '__main__':
main(sys.argv)
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