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      1 # Copyright 2013 The Chromium Authors. All rights reserved.
      2 # Use of this source code is governed by a BSD-style license that can be
      3 # found in the LICENSE file.
      4 
      5 
      6 import functools
      7 import logging
      8 import os
      9 import shlex
     10 import sys
     11 
     12 
     13 def memoize(default=None):
     14   """This decorator caches the return value of a parameterless pure function"""
     15   def memoizer(func):
     16     val = []
     17     @functools.wraps(func)
     18     def inner():
     19       if not val:
     20         ret = func()
     21         val.append(ret if ret is not None else default)
     22         if logging.getLogger().isEnabledFor(logging.INFO):
     23           print '%s -> %r' % (func.__name__, val[0])
     24       return val[0]
     25     return inner
     26   return memoizer
     27 
     28 
     29 @memoize()
     30 def IsWindows():
     31   return sys.platform in ['win32', 'cygwin']
     32 
     33 
     34 @memoize()
     35 def IsLinux():
     36   return sys.platform.startswith(('linux', 'freebsd'))
     37 
     38 
     39 @memoize()
     40 def IsMac():
     41   return sys.platform == 'darwin'
     42 
     43 
     44 @memoize()
     45 def gyp_defines():
     46   """Parses and returns GYP_DEFINES env var as a dictionary."""
     47   return dict(arg.split('=', 1)
     48       for arg in shlex.split(os.environ.get('GYP_DEFINES', '')))
     49 
     50 @memoize()
     51 def gyp_msvs_version():
     52   return os.environ.get('GYP_MSVS_VERSION', '')
     53 
     54 @memoize()
     55 def distributor():
     56   """
     57   Returns a string which is the distributed build engine in use (if any).
     58   Possible values: 'goma', 'ib', ''
     59   """
     60   if 'goma' in gyp_defines():
     61     return 'goma'
     62   elif IsWindows():
     63     if 'CHROME_HEADLESS' in os.environ:
     64       return 'ib' # use (win and !goma and headless) as approximation of ib
     65 
     66 
     67 @memoize()
     68 def platform():
     69   """
     70   Returns a string representing the platform this build is targetted for.
     71   Possible values: 'win', 'mac', 'linux', 'ios', 'android'
     72   """
     73   if 'OS' in gyp_defines():
     74     if 'android' in gyp_defines()['OS']:
     75       return 'android'
     76     else:
     77       return gyp_defines()['OS']
     78   elif IsWindows():
     79     return 'win'
     80   elif IsLinux():
     81     return 'linux'
     82   else:
     83     return 'mac'
     84 
     85 
     86 @memoize()
     87 def builder():
     88   """
     89   Returns a string representing the build engine (not compiler) to use.
     90   Possible values: 'make', 'ninja', 'xcode', 'msvs', 'scons'
     91   """
     92   if 'GYP_GENERATORS' in os.environ:
     93     # for simplicity, only support the first explicit generator
     94     generator = os.environ['GYP_GENERATORS'].split(',')[0]
     95     if generator.endswith('-android'):
     96       return generator.split('-')[0]
     97     elif generator.endswith('-ninja'):
     98       return 'ninja'
     99     else:
    100       return generator
    101   else:
    102     if platform() == 'android':
    103       # Good enough for now? Do any android bots use make?
    104       return 'ninja'
    105     elif platform() == 'ios':
    106       return 'xcode'
    107     elif IsWindows():
    108       return 'ninja'
    109     elif IsLinux():
    110       return 'ninja'
    111     elif IsMac():
    112       return 'ninja'
    113     else:
    114       assert False, 'Don\'t know what builder we\'re using!'
    115