Alias.py.svn-base
上传用户:market2
上传日期:2018-11-18
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文件大小:4k
- """scons.Node.Alias
- Alias nodes.
- This creates a hash of global Aliases (dummy targets).
- """
- #
- # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 The SCons Foundation
- #
- # 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__ = "src/engine/SCons/Node/Alias.py 3057 2008/06/09 22:21:00 knight"
- import string
- import UserDict
- import SCons.Errors
- import SCons.Node
- import SCons.Util
- class AliasNameSpace(UserDict.UserDict):
- def Alias(self, name, **kw):
- if isinstance(name, SCons.Node.Alias.Alias):
- return name
- try:
- a = self[name]
- except KeyError:
- a = apply(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):
- current_version_id = 1
- field_list = ['csig']
- def str_to_node(self, s):
- return default_ans.Alias(s)
- class AliasBuildInfo(SCons.Node.BuildInfoBase):
- current_version_id = 1
- class Alias(SCons.Node.Node):
- NodeInfo = AliasNodeInfo
- BuildInfo = AliasBuildInfo
- def __init__(self, name):
- SCons.Node.Node.__init__(self)
- self.name = name
- 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 = map(lambda n: n.get_csig(), self.children())
- return string.join(childsigs, '')
- def sconsign(self):
- """An Alias is not recorded in .sconsign files"""
- pass
- #
- #
- #
- def changed_since_last_build(self, target, prev_ni):
- cur_csig = self.get_csig()
- try:
- return cur_csig != prev_ni.csig
- except AttributeError:
- return 1
- 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 = SCons.Util.MD5signature(contents)
- self.get_ninfo().csig = csig
- return csig
- default_ans = AliasNameSpace()
- SCons.Node.arg2nodes_lookups.append(default_ans.lookup)