Python.py
上传用户:market2
上传日期:2018-11-18
资源大小:18786k
文件大小:4k
- """scons.Node.Python
- Python nodes.
- """
- #
- # 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/Python.py 3057 2008/06/09 22:21:00 knight"
- import SCons.Node
- class ValueNodeInfo(SCons.Node.NodeInfoBase):
- current_version_id = 1
- field_list = ['csig']
- def str_to_node(self, s):
- return Value(s)
- class ValueBuildInfo(SCons.Node.BuildInfoBase):
- current_version_id = 1
- class Value(SCons.Node.Node):
- """A class for Python variables, typically passed on the command line
- or generated by a script, but not from a file or some other source.
- """
- NodeInfo = ValueNodeInfo
- BuildInfo = ValueBuildInfo
- def __init__(self, value, built_value=None):
- SCons.Node.Node.__init__(self)
- self.value = value
- if not built_value is None:
- self.built_value = built_value
- def str_for_display(self):
- return repr(self.value)
- def __str__(self):
- return str(self.value)
- def make_ready(self):
- self.get_csig()
- def build(self, **kw):
- if not hasattr(self, 'built_value'):
- apply (SCons.Node.Node.build, (self,), kw)
- is_up_to_date = SCons.Node.Node.children_are_up_to_date
- def is_under(self, dir):
- # Make Value nodes get built regardless of
- # what directory scons was run from. Value nodes
- # are outside the filesystem:
- return 1
- def write(self, built_value):
- """Set the value of the node."""
- self.built_value = built_value
- def read(self):
- """Return the value. If necessary, the value is built."""
- self.build()
- if not hasattr(self, 'built_value'):
- self.built_value = self.value
- return self.built_value
- def get_contents(self):
- """By the assumption that the node.built_value is a
- deterministic product of the sources, the contents of a Value
- are the concatenation of all the contents of its sources. As
- the value need not be built when get_contents() is called, we
- cannot use the actual node.built_value."""
- contents = str(self.value)
- for kid in self.children(None):
- contents = contents + kid.get_contents()
- return contents
- 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 get_csig(self, calc=None):
- """Because we're a Python value node and don't have a real
- timestamp, we get to ignore the calculator and just use the
- value contents."""
- try:
- return self.ninfo.csig
- except AttributeError:
- pass
- contents = self.get_contents()
- self.get_ninfo().csig = contents
- return contents