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 - 2017 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 74b2c53bc42290e911b334a6b44f187da698a668 2017/11/14 13:16:53 bdbaddog" 
 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      __slots__ = ('csig',) 
 60      current_version_id = 2 
 61      field_list = ['csig'] 
 62 -    def str_to_node(self, s): 
 63          return default_ans.Alias(s) 
 64   
 65 -    def __getstate__(self): 
 66          """ 
 67          Return all fields that shall be pickled. Walk the slots in the class 
 68          hierarchy and add those to the state dictionary. If a '__dict__' slot is 
 69          available, copy all entries to the dictionary. Also include the version 
 70          id, which is fixed for all instances of a class. 
 71          """ 
 72          state = getattr(self, '__dict__', {}).copy() 
 73          for obj in type(self).mro(): 
 74              for name in getattr(obj,'__slots__',()): 
 75                  if hasattr(self, name): 
 76                      state[name] = getattr(self, name) 
 77   
 78          state['_version_id'] = self.current_version_id 
 79          try: 
 80              del state['__weakref__'] 
 81          except KeyError: 
 82              pass 
 83   
 84          return state 
 85   
 86 -    def __setstate__(self, state): 
 87          """ 
 88          Restore the attributes from a pickled state. 
 89          """ 
 90          # TODO check or discard version 
 91          del state['_version_id'] 
 92          for key, value in state.items(): 
 93              if key not in ('__weakref__',): 
 94                  setattr(self, key, value) 
 95             
 96   
 97 -class AliasBuildInfo(SCons.Node.BuildInfoBase): 
 98      __slots__ = () 
 99      current_version_id = 2 
100   
101 -class Alias(SCons.Node.Node): 
102   
103      NodeInfo = AliasNodeInfo 
104      BuildInfo = AliasBuildInfo 
105   
106 -    def __init__(self, name): 
107          SCons.Node.Node.__init__(self) 
108          self.name = name 
109          self.changed_since_last_build = 1 
110          self.store_info = 0 
111           
112 -    def str_for_display(self): 
113          return '"' + self.__str__() + '"' 
114   
115 -    def __str__(self): 
116          return self.name 
117   
118 -    def make_ready(self): 
119          self.get_csig() 
120   
121      really_build = SCons.Node.Node.build 
122      is_up_to_date = SCons.Node.Node.children_are_up_to_date 
123   
124 -    def is_under(self, dir): 
125          # Make Alias nodes get built regardless of 
126          # what directory scons was run from. Alias nodes 
127          # are outside the filesystem: 
128          return 1 
129   
130 -    def get_contents(self): 
131          """The contents of an alias is the concatenation 
132          of the content signatures of all its sources.""" 
133          childsigs = [n.get_csig() for n in self.children()] 
134          return ''.join(childsigs) 
135   
136 -    def sconsign(self): 
137          """An Alias is not recorded in .sconsign files""" 
138          pass 
139   
140      # 
141      # 
142      # 
143   
144 -    def build(self): 
145          """A "builder" for aliases.""" 
146          pass 
147   
148 -    def convert(self): 
149          try: del self.builder 
150          except AttributeError: pass 
151          self.reset_executor() 
152          self.build = self.really_build 
153   
154 -    def get_csig(self): 
155          """ 
156          Generate a node's content signature, the digested signature 
157          of its content. 
158   
159          node - the node 
160          cache - alternate node to use for the signature cache 
161          returns - the content signature 
162          """ 
163          try: 
164              return self.ninfo.csig 
165          except AttributeError: 
166              pass 
167   
168          contents = self.get_contents() 
169          csig = SCons.Util.MD5signature(contents) 
170          self.get_ninfo().csig = csig 
171          return csig 
172   
173  default_ans = AliasNameSpace() 
174   
175  SCons.Node.arg2nodes_lookups.append(default_ans.lookup) 
176   
177  # Local Variables: 
178  # tab-width:4 
179  # indent-tabs-mode:nil 
180  # End: 
181  # vim: set expandtab tabstop=4 shiftwidth=4: 
182