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| 1 # Copyright (c) 2006-2008 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 Tool module for managing conditional loading of components in a |
| 7 Chromium build (i.e., the LOAD= command-line argument). |
| 8 """ |
| 9 |
| 10 from SCons.Script import * |
| 11 |
| 12 def generate(env): |
| 13 |
| 14 class LoadComponent: |
| 15 """ |
| 16 Class for deciding if a given component name is to be included |
| 17 based on a list of included names, optionally prefixed with '-' |
| 18 to exclude the name. |
| 19 """ |
| 20 def __init__(self, load=[], names=[]): |
| 21 """ |
| 22 Initialize a class with a list of names for possible loading. |
| 23 |
| 24 Arguments: |
| 25 load: list of elements in the LOAD= specification |
| 26 names: name(s) that represent this global collection |
| 27 """ |
| 28 self.included = set([c for c in load if not c.startswith('-')]) |
| 29 self.excluded = set([c[1:] for c in load if c.startswith('-')]) |
| 30 |
| 31 # Remove the global collection name(s) from the included list. |
| 32 # This supports (e.g.) specifying 'webkit' so the top-level of the |
| 33 # hierarchy will read up the subsystem, and then 'test_shell' |
| 34 # as one specific sub-component within 'webkit'. |
| 35 self.included = self.included - set(names) |
| 36 |
| 37 if not self.included: |
| 38 self.included = ['all'] |
| 39 |
| 40 def __call__(self, component): |
| 41 """ |
| 42 Returns True if the specified component should be loaded, |
| 43 based on the initialized included and excluded lists. |
| 44 """ |
| 45 return (component in self.included or |
| 46 ('all' in self.included and not component in self.excluded)) |
| 47 |
| 48 def ChromiumLoadComponentSConscripts(env, *args, **kw): |
| 49 """ |
| 50 Returns a list of SConscript files to load, based on LOAD=. |
| 51 |
| 52 SConscript files specified without keyword arguments are returned |
| 53 unconditionally. SConscript files specified with a keyword arguments |
| 54 (e.g. chrome = 'chrome.scons') are loaded only if the LOAD= line |
| 55 indicates their keyword argument should be included in the load. |
| 56 """ |
| 57 try: |
| 58 load = ARGUMENTS.get('LOAD').split(',') |
| 59 except AttributeError: |
| 60 load = [] |
| 61 |
| 62 try: |
| 63 names = kw['LOAD_NAMES'] |
| 64 except KeyError: |
| 65 names = [] |
| 66 else: |
| 67 del kw['LOAD_NAMES'] |
| 68 |
| 69 load_component = LoadComponent(load, names) |
| 70 |
| 71 result = list(args) |
| 72 for module, sconscript in kw.items(): |
| 73 if load_component(module): |
| 74 result.append(sconscript) |
| 75 |
| 76 return Flatten(result) |
| 77 |
| 78 env.AddMethod(ChromiumLoadComponentSConscripts) |
| 79 |
| 80 def exists(env): |
| 81 return True |
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