forked from OSchip/llvm-project
104 lines
3.2 KiB
Python
Executable File
104 lines
3.2 KiB
Python
Executable File
#!/usr/bin/env python
|
|
"""Emulates the bits of CMake's configure_file() function needed in LLVM.
|
|
|
|
The CMake build uses configure_file() for several things. This emulates that
|
|
function for the GN build. In the GN build, this runs at build time, instead
|
|
of at generator time.
|
|
|
|
Takes a list of KEY=VALUE pairs (where VALUE can be empty).
|
|
|
|
On each line, replaces ${KEY} with VALUE.
|
|
|
|
After that, also handles these special cases (note that FOO= sets the value of
|
|
FOO to the empty string, which is falsy, but FOO=0 sets it to '0' which is
|
|
truthy):
|
|
|
|
1.) #cmakedefine01 FOO
|
|
Checks if key FOO is set to a truthy value, and depending on that prints
|
|
one of the following two lines:
|
|
|
|
#define FOO 1
|
|
#define FOO 0
|
|
|
|
2.) #cmakedefine FOO [...]
|
|
Checks if key FOO is set to a truthy in value, and depending on that prints
|
|
one of the following two lines:
|
|
|
|
#define FOO [...]
|
|
/* #undef FOO */
|
|
|
|
Fails if any of the KEY=VALUE arguments aren't needed for processing the
|
|
.h.cmake file, or if the .h.cmake file has unreplaced ${VAR} references after
|
|
processing all values.
|
|
"""
|
|
|
|
from __future__ import print_function
|
|
|
|
import argparse
|
|
import os
|
|
import re
|
|
import sys
|
|
|
|
|
|
def main():
|
|
parser = argparse.ArgumentParser(
|
|
epilog=__doc__,
|
|
formatter_class=argparse.RawDescriptionHelpFormatter)
|
|
parser.add_argument('input', help='input file')
|
|
parser.add_argument('values', nargs='*', help='several KEY=VALUE pairs')
|
|
parser.add_argument('-o', '--output', required=True,
|
|
help='output file')
|
|
args = parser.parse_args()
|
|
|
|
values = {}
|
|
for value in args.values:
|
|
key, val = value.split('=', 1)
|
|
values[key] = val
|
|
unused_values = set(values.keys())
|
|
|
|
# Matches e.g. '${CLANG_FOO}' and captures CLANG_FOO in group 1.
|
|
var_re = re.compile(r'\$\{([^}]*)\}')
|
|
|
|
in_lines = open(args.input).readlines()
|
|
out_lines = []
|
|
for in_line in in_lines:
|
|
def repl(m):
|
|
unused_values.discard(m.group(1))
|
|
return values[m.group(1)]
|
|
in_line = var_re.sub(repl, in_line)
|
|
if in_line.startswith('#cmakedefine01 '):
|
|
_, var = in_line.split()
|
|
in_line = '#define %s %d\n' % (var, 1 if values[var] else 0)
|
|
unused_values.discard(var)
|
|
elif in_line.startswith('#cmakedefine '):
|
|
_, var = in_line.split(None, 1)
|
|
try:
|
|
var, val = var.split(None, 1)
|
|
in_line = '#define %s %s' % (var, val) # val ends in \n.
|
|
except:
|
|
var = var.rstrip()
|
|
in_line = '#define %s\n' % var
|
|
if not values[var]:
|
|
in_line = '/* #undef %s */\n' % var
|
|
unused_values.discard(var)
|
|
out_lines.append(in_line)
|
|
|
|
if unused_values:
|
|
print('unused values args:', file=sys.stderr)
|
|
print(' ', '\n '.join(unused_values), file=sys.stderr)
|
|
return 1
|
|
|
|
output = ''.join(out_lines)
|
|
|
|
leftovers = var_re.findall(output)
|
|
if leftovers:
|
|
print('unprocessed values:\n', '\n'.join(leftovers), file=sys.stderr)
|
|
return 1
|
|
|
|
if not os.path.exists(args.output) or open(args.output).read() != output:
|
|
open(args.output, 'w').write(output)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
sys.exit(main())
|