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"""scons.Node.Alias
Alias nodes.
This creates a hash of global Aliases (dummy targets).
"""
#
# __COPYRIGHT__
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
import collections
import SCons.Errors
import SCons.Node
import SCons.Util
from SCons.Util import MD5signature
class AliasNameSpace(collections.UserDict):
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
def lookup(self, name, **kw):
try:
return self[name]
except KeyError:
return None
class AliasNodeInfo(SCons.Node.NodeInfoBase):
__slots__ = ('csig',)
current_version_id = 2
field_list = ['csig']
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)
class AliasBuildInfo(SCons.Node.BuildInfoBase):
__slots__ = ()
current_version_id = 2
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
def str_for_display(self):
return '"' + self.__str__() + '"'
def __str__(self):
return self.name
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
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
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)
def sconsign(self):
"""An Alias is not recorded in .sconsign files"""
pass
#
#
#
def build(self):
"""A "builder" for aliases."""
pass
def convert(self):
try: del self.builder
except AttributeError: pass
self.reset_executor()
self.build = self.really_build
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 = MD5signature(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:
|
