| # Copyright 2013 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. |
| |
| |
| import functools |
| import logging |
| import os |
| import shlex |
| import sys |
| |
| |
| def memoize(default=None): |
| """This decorator caches the return value of a parameterless pure function""" |
| def memoizer(func): |
| val = [] |
| @functools.wraps(func) |
| def inner(): |
| if not val: |
| ret = func() |
| val.append(ret if ret is not None else default) |
| if logging.getLogger().isEnabledFor(logging.INFO): |
| print '%s -> %r' % (func.__name__, val[0]) |
| return val[0] |
| return inner |
| return memoizer |
| |
| |
| @memoize() |
| def IsWindows(): |
| return sys.platform in ['win32', 'cygwin'] |
| |
| |
| @memoize() |
| def IsLinux(): |
| return sys.platform.startswith(('linux', 'freebsd', 'netbsd', 'openbsd')) |
| |
| |
| @memoize() |
| def IsMac(): |
| return sys.platform == 'darwin' |
| |
| |
| @memoize() |
| def gyp_defines(): |
| """Parses and returns GYP_DEFINES env var as a dictionary.""" |
| return dict(arg.split('=', 1) |
| for arg in shlex.split(os.environ.get('GYP_DEFINES', ''))) |
| |
| |
| @memoize() |
| def gyp_generator_flags(): |
| """Parses and returns GYP_GENERATOR_FLAGS env var as a dictionary.""" |
| return dict(arg.split('=', 1) |
| for arg in shlex.split(os.environ.get('GYP_GENERATOR_FLAGS', ''))) |
| |
| |
| @memoize() |
| def gyp_msvs_version(): |
| return os.environ.get('GYP_MSVS_VERSION', '') |
| |
| |
| @memoize() |
| def distributor(): |
| """ |
| Returns a string which is the distributed build engine in use (if any). |
| Possible values: 'goma', None |
| """ |
| if 'goma' in gyp_defines(): |
| return 'goma' |
| |
| |
| @memoize() |
| def platform(): |
| """ |
| Returns a string representing the platform this build is targeted for. |
| Possible values: 'win', 'mac', 'linux', 'ios', 'android' |
| """ |
| if 'OS' in gyp_defines(): |
| if 'android' in gyp_defines()['OS']: |
| return 'android' |
| else: |
| return gyp_defines()['OS'] |
| elif IsWindows(): |
| return 'win' |
| elif IsLinux(): |
| return 'linux' |
| else: |
| return 'mac' |