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# Copyright 2016 The TensorFlow Authors. All Rights Reserved.
#
# 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
#
# http://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.
# ==============================================================================
"""Expands CMake variables in a text file."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import re
import sys
_CMAKE_DEFINE_REGEX = re.compile(r"\s*#cmakedefine\s+([A-Za-z_0-9]*)(\s.*)?$")
_CMAKE_DEFINE01_REGEX = re.compile(r"\s*#cmakedefine01\s+([A-Za-z_0-9]*)")
_CMAKE_VAR_REGEX = re.compile(r"\${([A-Za-z_0-9]*)}")
def _parse_args(argv):
"""Parses arguments with the form KEY=VALUE into a dictionary."""
result = {}
for arg in argv:
k, v = arg.split("=")
result[k] = v
return result
def _expand_variables(input_str, cmake_vars):
"""Expands ${VARIABLE}s in 'input_str', using dictionary 'cmake_vars'.
Args:
input_str: the string containing ${VARIABLE} expressions to expand.
cmake_vars: a dictionary mapping variable names to their values.
Returns:
The expanded string.
"""
def replace(match):
if match.group(1) in cmake_vars:
return cmake_vars[match.group(1)]
return ""
return _CMAKE_VAR_REGEX.sub(replace, input_str)
def _expand_cmakedefines(line, cmake_vars):
"""Expands #cmakedefine declarations, using a dictionary 'cmake_vars'."""
# Handles #cmakedefine lines
match = _CMAKE_DEFINE_REGEX.match(line)
if match:
name = match.group(1)
suffix = match.group(2) or ""
if name in cmake_vars:
return "#define {}{}\n".format(name,
_expand_variables(suffix, cmake_vars))
else:
return "/* #undef {} */\n".format(name)
# Handles #cmakedefine01 lines
match = _CMAKE_DEFINE01_REGEX.match(line)
if match:
name = match.group(1)
value = cmake_vars.get(name, "0")
return "#define {} {}\n".format(name, value)
# Otherwise return the line unchanged.
return _expand_variables(line, cmake_vars)
def main():
cmake_vars = _parse_args(sys.argv[1:])
for line in sys.stdin:
sys.stdout.write(_expand_cmakedefines(line, cmake_vars))
if __name__ == "__main__":
main()
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