1 2"""scons.Node.Alias 3 4Alias nodes. 5 6This creates a hash of global Aliases (dummy targets). 7 8""" 9 10# 11# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation 12# 13# Permission is hereby granted, free of charge, to any person obtaining 14# a copy of this software and associated documentation files (the 15# "Software"), to deal in the Software without restriction, including 16# without limitation the rights to use, copy, modify, merge, publish, 17# distribute, sublicense, and/or sell copies of the Software, and to 18# permit persons to whom the Software is furnished to do so, subject to 19# the following conditions: 20# 21# The above copyright notice and this permission notice shall be included 22# in all copies or substantial portions of the Software. 23# 24# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY 25# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 26# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 28# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 29# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 30# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 31# 32 33__revision__ = "src/engine/SCons/Node/Alias.py 4369 2009/09/19 15:58:29 scons" 34 35import string 36import UserDict 37 38import SCons.Errors 39import SCons.Node 40import SCons.Util 41 42class AliasNameSpace(UserDict.UserDict): 43 def Alias(self, name, **kw): 44 if isinstance(name, SCons.Node.Alias.Alias): 45 return name 46 try: 47 a = self[name] 48 except KeyError: 49 a = SCons.Node.Alias.Alias(*(name,), **kw) 50 self[name] = a 51 return a 52 53 def lookup(self, name, **kw): 54 try: 55 return self[name] 56 except KeyError: 57 return None 58 59class AliasNodeInfo(SCons.Node.NodeInfoBase): 60 current_version_id = 1 61 field_list = ['csig'] 62 def str_to_node(self, s): 63 return default_ans.Alias(s) 64 65class AliasBuildInfo(SCons.Node.BuildInfoBase): 66 current_version_id = 1 67 68class Alias(SCons.Node.Node): 69 70 NodeInfo = AliasNodeInfo 71 BuildInfo = AliasBuildInfo 72 73 def __init__(self, name): 74 SCons.Node.Node.__init__(self) 75 self.name = name 76 77 def str_for_display(self): 78 return '"' + self.__str__() + '"' 79 80 def __str__(self): 81 return self.name 82 83 def make_ready(self): 84 self.get_csig() 85 86 really_build = SCons.Node.Node.build 87 is_up_to_date = SCons.Node.Node.children_are_up_to_date 88 89 def is_under(self, dir): 90 # Make Alias nodes get built regardless of 91 # what directory scons was run from. Alias nodes 92 # are outside the filesystem: 93 return 1 94 95 def get_contents(self): 96 """The contents of an alias is the concatenation 97 of the content signatures of all its sources.""" 98 childsigs = map(lambda n: n.get_csig(), self.children()) 99 return string.join(childsigs, '') 100 101 def sconsign(self): 102 """An Alias is not recorded in .sconsign files""" 103 pass 104 105 # 106 # 107 # 108 109 def changed_since_last_build(self, target, prev_ni): 110 cur_csig = self.get_csig() 111 try: 112 return cur_csig != prev_ni.csig 113 except AttributeError: 114 return 1 115 116 def build(self): 117 """A "builder" for aliases.""" 118 pass 119 120 def convert(self): 121 try: del self.builder 122 except AttributeError: pass 123 self.reset_executor() 124 self.build = self.really_build 125 126 def get_csig(self): 127 """ 128 Generate a node's content signature, the digested signature 129 of its content. 130 131 node - the node 132 cache - alternate node to use for the signature cache 133 returns - the content signature 134 """ 135 try: 136 return self.ninfo.csig 137 except AttributeError: 138 pass 139 140 contents = self.get_contents() 141 csig = SCons.Util.MD5signature(contents) 142 self.get_ninfo().csig = csig 143 return csig 144 145default_ans = AliasNameSpace() 146 147SCons.Node.arg2nodes_lookups.append(default_ans.lookup) 148 149# Local Variables: 150# tab-width:4 151# indent-tabs-mode:nil 152# End: 153# vim: set expandtab tabstop=4 shiftwidth=4: 154