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Side by Side Diff: build/write_buildflag_header.py

Issue 1458653002: New build flag system, convert Google Now flag (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 5 years ago
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1 #!/usr/bin/env python
2 # Copyright 2015 The Chromium Authors. All rights reserved.
3 # Use of this source code is governed by a BSD-style license that can be
4 # found in the LICENSE file.
5
6 # This writes headers for build flags. See buildflag_header.gni for usage of
7 # this system as a whole.
8 #
9 # The parameters are passed in a response file so we don't have to worry
10 # about command line lengths. The name of the response file is passed on the
11 # command line.
12 #
13 # The format of the response file is:
14 # [--flags <list of one or more flag values>]
15
16 import optparse
17 import os
18 import shlex
19 import sys
20
21
22 class Options:
23 def __init__(self, output, rulename, header_guard, flags):
24 self.output = output
25 self.rulename = rulename
26 self.header_guard = header_guard
27 self.flags = flags
28
29
30 def GetOptions():
31 parser = optparse.OptionParser()
32 parser.add_option('--output', help="Output header name inside --gen-dir.")
33 parser.add_option('--rulename',
34 help="Helpful name of build rule for including in the " +
35 "comment at the top of the file.")
36 parser.add_option('--gen-dir',
37 help="Path to root of generated file directory tree.")
38 parser.add_option('--definitions',
39 help="Name of the response file containing the flags.")
40 cmdline_options, cmdline_flags = parser.parse_args()
41
42 # Compute header guard by replacing some chars with _ and upper-casing.
43 header_guard = cmdline_options.output.upper()
44 header_guard = \
45 header_guard.replace('/', '_').replace('\\', '_').replace('.', '_')
46 header_guard += '_'
47
48 # The actual output file is inside the gen dir.
49 output = os.path.join(cmdline_options.gen_dir, cmdline_options.output)
50
51 # Definition file in GYP is newline separated, in GN they are shell formatted.
52 # shlex can parse both of these.
53 with open(cmdline_options.definitions, 'r') as def_file:
54 defs = shlex.split(def_file.read())
55 flags_index = defs.index('--flags')
56
57 # Everything after --flags are flags. true/false are remapped to 1/0,
58 # everything else is passed through.
59 flags = []
60 for flag in defs[flags_index + 1 :]:
61 equals_index = flag.index('=')
62 key = flag[:equals_index]
63 value = flag[equals_index + 1:]
64
65 # Canonicalize and validate the value.
66 if value == 'true':
67 value = '1'
68 elif value == 'false':
69 value = '0'
70 flags.append((key, str(value)))
71
72 return Options(output=output,
73 rulename=cmdline_options.rulename,
74 header_guard=header_guard,
75 flags=flags)
76
77
78 def WriteHeader(options):
79 with open(options.output, 'w') as output_file:
80 output_file.write("// Generated by build/write_buildflag_header.py\n")
81 if options.rulename:
82 output_file.write('// From "' + options.rulename + '"\n')
83
84 output_file.write('\n#ifndef %s\n' % options.header_guard)
85 output_file.write('#define %s\n\n' % options.header_guard)
86 output_file.write('#include "build/buildflag.h"\n\n')
87
88 for pair in options.flags:
89 output_file.write('#define BUILDFLAG_INTERNAL_%s() (%s)\n' % pair)
90
91 output_file.write('\n#endif // %s\n' % options.header_guard)
92
93
94 options = GetOptions()
95 WriteHeader(options)
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