Source code for SCons.Node.Alias

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"""Alias nodes.

This creates a hash of global Aliases (dummy targets).
"""

import collections

import SCons.Errors
import SCons.Node
import SCons.Util
from SCons.Util import hash_signature

[docs]class AliasNameSpace(collections.UserDict):
[docs] def Alias(self, name, **kw): if isinstance(name, SCons.Node.Alias.Alias): return name try: a = self[name] except KeyError: a = SCons.Node.Alias.Alias(name, **kw) self[name] = a return a
[docs] def lookup(self, name, **kw): try: return self[name] except KeyError: return None
[docs]class AliasNodeInfo(SCons.Node.NodeInfoBase): __slots__ = ('csig',) current_version_id = 2 field_list = ['csig']
[docs] def str_to_node(self, s): return default_ans.Alias(s)
def __getstate__(self): """ Return all fields that shall be pickled. Walk the slots in the class hierarchy and add those to the state dictionary. If a '__dict__' slot is available, copy all entries to the dictionary. Also include the version id, which is fixed for all instances of a class. """ state = getattr(self, '__dict__', {}).copy() for obj in type(self).mro(): for name in getattr(obj,'__slots__',()): if hasattr(self, name): state[name] = getattr(self, name) state['_version_id'] = self.current_version_id try: del state['__weakref__'] except KeyError: pass return state def __setstate__(self, state): """ Restore the attributes from a pickled state. """ # TODO check or discard version del state['_version_id'] for key, value in state.items(): if key not in ('__weakref__',): setattr(self, key, value)
[docs]class AliasBuildInfo(SCons.Node.BuildInfoBase): __slots__ = () current_version_id = 2
[docs]class Alias(SCons.Node.Node): NodeInfo = AliasNodeInfo BuildInfo = AliasBuildInfo def __init__(self, name): SCons.Node.Node.__init__(self) self.name = name self.changed_since_last_build = 1 self.store_info = 0
[docs] def str_for_display(self): return '"' + self.__str__() + '"'
def __str__(self): return self.name
[docs] def make_ready(self): self.get_csig()
really_build = SCons.Node.Node.build is_up_to_date = SCons.Node.Node.children_are_up_to_date
[docs] def is_under(self, dir): # Make Alias nodes get built regardless of # what directory scons was run from. Alias nodes # are outside the filesystem: return 1
[docs] def get_contents(self): """The contents of an alias is the concatenation of the content signatures of all its sources.""" childsigs = [n.get_csig() for n in self.children()] return ''.join(childsigs)
[docs] def sconsign(self): """An Alias is not recorded in .sconsign files""" pass
# # #
[docs] def build(self): """A "builder" for aliases.""" pass
[docs] def convert(self): try: del self.builder except AttributeError: pass self.reset_executor() self.build = self.really_build
[docs] def get_csig(self): """ Generate a node's content signature, the digested signature of its content. node - the node cache - alternate node to use for the signature cache returns - the content signature """ try: return self.ninfo.csig except AttributeError: pass contents = self.get_contents() csig = hash_signature(contents) self.get_ninfo().csig = csig return csig
default_ans = AliasNameSpace() SCons.Node.arg2nodes_lookups.append(default_ans.lookup) # Local Variables: # tab-width:4 # indent-tabs-mode:nil # End: # vim: set expandtab tabstop=4 shiftwidth=4: