| # Copyright 2014 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. |
| |
| """Converts a given gypi file to a python scope and writes the result to stdout. |
| |
| It is assumed that the file contains a toplevel dictionary, and this script |
| will return that dictionary as a GN "scope" (see example below). This script |
| does not know anything about GYP and it will not expand variables or execute |
| conditions (it will check for the presence of a "conditions" value in the |
| dictionary and will abort if it is present). It also does not support nested |
| dictionaries. |
| |
| Say your_file.gypi looked like this: |
| { |
| 'sources': [ 'a.cc', 'b.cc' ], |
| 'defines': [ 'ENABLE_DOOM_MELON' ], |
| } |
| |
| You would call it like this: |
| gypi_values = exec_script("//build/gypi_to_gn.py", |
| [ rebase_path("your_file.gypi") ], |
| "scope", |
| [ "your_file.gypi" ]) |
| |
| Notes: |
| - The rebase_path call converts the gypi file from being relative to the |
| current build file to being system absolute for calling the script, which |
| will have a different current directory than this file. |
| |
| - The "scope" parameter tells GN to interpret the result as a series of GN |
| variable assignments. |
| |
| - The last file argument to exec_script tells GN that the given file is a |
| dependency of the build so Ninja can automatically re-run GN if the file |
| changes. |
| |
| Read the values into a target like this: |
| component("mycomponent") { |
| sources = gypi_values.sources |
| defines = gypi_values.defines |
| } |
| |
| Sometimes your .gypi file will include paths relative to a different |
| directory than the current .gn file. In this case, you can rebase them to |
| be relative to the current directory. |
| sources = rebase_path(gypi_values.sources, ".", |
| "//path/gypi/input/values/are/relative/to") |
| """ |
| |
| import gn_helpers |
| from optparse import OptionParser |
| import sys |
| |
| def LoadPythonDictionary(path): |
| file_string = open(path).read() |
| try: |
| file_data = eval(file_string, {'__builtins__': None}, None) |
| except SyntaxError, e: |
| e.filename = path |
| raise |
| except Exception, e: |
| raise Exception("Unexpected error while reading %s: %s" % (path, str(e))) |
| |
| assert isinstance(file_data, dict), "%s does not eval to a dictionary" % path |
| assert 'conditions' not in file_data, \ |
| "The file %s has conditions in it, these aren't supported." % path |
| |
| return file_data |
| |
| |
| def main(): |
| parser = OptionParser() |
| (options, args) = parser.parse_args() |
| |
| if len(args) != 1: |
| raise Exception("Need one argument which is the .gypi file to read.") |
| |
| data = LoadPythonDictionary(args[0]) |
| print gn_helpers.ToGNString(data) |
| |
| if __name__ == '__main__': |
| try: |
| main() |
| except Exception, e: |
| print str(e) |
| sys.exit(1) |