Source Code for Module SCons.Node.Alias

  1   
  2  """scons.Node.Alias 
  3   
  4  Alias nodes. 
  5   
  6  This creates a hash of global Aliases (dummy targets). 
  7   
  8  """ 
  9   
 10  # 
 11  # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 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 5023 2010/06/14 22:05:46 scons" 
 34   
 35  import collections 
 36   
 37  import SCons.Errors 
 38  import SCons.Node 
 39  import SCons.Util 
 40   
 41 -class AliasNameSpace(collections.UserDict): 
 42 -    def Alias(self, name, **kw): 
 43          if isinstance(name, SCons.Node.Alias.Alias): 
 44              return name 
 45          try: 
 46              a = self[name] 
 47          except KeyError: 
 48              a = SCons.Node.Alias.Alias(name, **kw) 
 49              self[name] = a 
 50          return a 
 51   
 52 -    def lookup(self, name, **kw): 
 53          try: 
 54              return self[name] 
 55          except KeyError: 
 56              return None 
 57   
 58 -class AliasNodeInfo(SCons.Node.NodeInfoBase): 
 59      current_version_id = 1 
 60      field_list = ['csig'] 
 61 -    def str_to_node(self, s): 
 62          return default_ans.Alias(s) 
 63   
 64 -class AliasBuildInfo(SCons.Node.BuildInfoBase): 
 65      current_version_id = 1 
 66   
 67 -class Alias(SCons.Node.Node): 
 68   
 69      NodeInfo = AliasNodeInfo 
 70      BuildInfo = AliasBuildInfo 
 71   
 72 -    def __init__(self, name): 
 73          SCons.Node.Node.__init__(self) 
 74          self.name = name 
 75   
 76 -    def str_for_display(self): 
 77          return '"' + self.__str__() + '"' 
 78   
 79 -    def __str__(self): 
 80          return self.name 
 81   
 82 -    def make_ready(self): 
 83          self.get_csig() 
 84   
 85      really_build = SCons.Node.Node.build 
 86      is_up_to_date = SCons.Node.Node.children_are_up_to_date 
 87   
 88 -    def is_under(self, dir): 
 89          # Make Alias nodes get built regardless of 
 90          # what directory scons was run from. Alias nodes 
 91          # are outside the filesystem: 
 92          return 1 
 93   
 94 -    def get_contents(self): 
 95          """The contents of an alias is the concatenation 
 96          of the content signatures of all its sources.""" 
 97          childsigs = [n.get_csig() for n in self.children()] 
 98          return ''.join(childsigs) 
 99   
100 -    def sconsign(self): 
101          """An Alias is not recorded in .sconsign files""" 
102          pass 
103   
104      # 
105      # 
106      # 
107   
108 -    def changed_since_last_build(self, target, prev_ni): 
109          cur_csig = self.get_csig() 
110          try: 
111              return cur_csig != prev_ni.csig 
112          except AttributeError: 
113              return 1 
114   
115 -    def build(self): 
116          """A "builder" for aliases.""" 
117          pass 
118   
119 -    def convert(self): 
120          try: del self.builder 
121          except AttributeError: pass 
122          self.reset_executor() 
123          self.build = self.really_build 
124   
125 -    def get_csig(self): 
126          """ 
127          Generate a node's content signature, the digested signature 
128          of its content. 
129   
130          node - the node 
131          cache - alternate node to use for the signature cache 
132          returns - the content signature 
133          """ 
134          try: 
135              return self.ninfo.csig 
136          except AttributeError: 
137              pass 
138   
139          contents = self.get_contents() 
140          csig = SCons.Util.MD5signature(contents) 
141          self.get_ninfo().csig = csig 
142          return csig 
143   
144  default_ans = AliasNameSpace() 
145   
146  SCons.Node.arg2nodes_lookups.append(default_ans.lookup) 
147   
148  # Local Variables: 
149  # tab-width:4 
150  # indent-tabs-mode:nil 
151  # End: 
152  # vim: set expandtab tabstop=4 shiftwidth=4: 
153