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- #!/usr/bin/env python
- # Copyright 2015 The Chromium Authors. All rights reserved.
- # Use of this source code is governed by a BSD-style license that can be
- # found in the LICENSE file.
- # This writes headers for build flags. See buildflag_header.gni for usage of
- # this system as a whole.
- #
- # The parameters are passed in a response file so we don't have to worry
- # about command line lengths. The name of the response file is passed on the
- # command line.
- #
- # The format of the response file is:
- # [--flags <list of one or more flag values>]
- import optparse
- import os
- import re
- import shlex
- class Options:
- def __init__(self, output, rulename, header_guard, flags):
- self.output = output
- self.rulename = rulename
- self.header_guard = header_guard
- self.flags = flags
- def GetOptions():
- parser = optparse.OptionParser()
- parser.add_option('--output', help="Output header name inside --gen-dir.")
- parser.add_option('--rulename',
- help="Helpful name of build rule for including in the " +
- "comment at the top of the file.")
- parser.add_option('--gen-dir',
- help="Path to root of generated file directory tree.")
- parser.add_option('--definitions',
- help="Name of the response file containing the flags.")
- cmdline_options, cmdline_flags = parser.parse_args()
- # Compute a valid C++ header guard by replacing non valid chars with '_',
- # upper-casing everything and prepending '_' if first symbol is digit.
- header_guard = cmdline_options.output.upper()
- if header_guard[0].isdigit():
- header_guard = '_' + header_guard
- header_guard = re.sub('[^\w]', '_', header_guard)
- header_guard += '_'
- # The actual output file is inside the gen dir.
- output = os.path.join(cmdline_options.gen_dir, cmdline_options.output)
- # Definition file in GYP is newline separated, in GN they are shell formatted.
- # shlex can parse both of these.
- with open(cmdline_options.definitions, 'r') as def_file:
- defs = shlex.split(def_file.read())
- flags_index = defs.index('--flags')
- # Everything after --flags are flags. true/false are remapped to 1/0,
- # everything else is passed through.
- flags = []
- for flag in defs[flags_index + 1 :]:
- equals_index = flag.index('=')
- key = flag[:equals_index]
- value = flag[equals_index + 1:]
- # Canonicalize and validate the value.
- if value == 'true':
- value = '1'
- elif value == 'false':
- value = '0'
- flags.append((key, str(value)))
- return Options(output=output,
- rulename=cmdline_options.rulename,
- header_guard=header_guard,
- flags=flags)
- def WriteHeader(options):
- with open(options.output, 'w') as output_file:
- output_file.write("// Generated by build/write_buildflag_header.py\n")
- if options.rulename:
- output_file.write('// From "' + options.rulename + '"\n')
- output_file.write('\n#ifndef %s\n' % options.header_guard)
- output_file.write('#define %s\n\n' % options.header_guard)
- output_file.write('#include "build/buildflag.h" // IWYU pragma: export\n\n')
- for pair in options.flags:
- output_file.write('#define BUILDFLAG_INTERNAL_%s() (%s)\n' % pair)
- output_file.write('\n#endif // %s\n' % options.header_guard)
- options = GetOptions()
- WriteHeader(options)
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