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119 lines
3.9 KiB
119 lines
3.9 KiB
"""scons.Node.Python
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Python nodes.
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"""
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#
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# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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__revision__ = "src/engine/SCons/Node/Python.py 3842 2008/12/20 22:59:52 scons"
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import SCons.Node
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class ValueNodeInfo(SCons.Node.NodeInfoBase):
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current_version_id = 1
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field_list = ['csig']
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def str_to_node(self, s):
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return Value(s)
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class ValueBuildInfo(SCons.Node.BuildInfoBase):
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current_version_id = 1
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class Value(SCons.Node.Node):
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"""A class for Python variables, typically passed on the command line
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or generated by a script, but not from a file or some other source.
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"""
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NodeInfo = ValueNodeInfo
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BuildInfo = ValueBuildInfo
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def __init__(self, value, built_value=None):
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SCons.Node.Node.__init__(self)
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self.value = value
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if not built_value is None:
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self.built_value = built_value
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def str_for_display(self):
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return repr(self.value)
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def __str__(self):
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return str(self.value)
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def make_ready(self):
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self.get_csig()
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def build(self, **kw):
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if not hasattr(self, 'built_value'):
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apply (SCons.Node.Node.build, (self,), kw)
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is_up_to_date = SCons.Node.Node.children_are_up_to_date
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def is_under(self, dir):
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# Make Value nodes get built regardless of
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# what directory scons was run from. Value nodes
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# are outside the filesystem:
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return 1
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def write(self, built_value):
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"""Set the value of the node."""
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self.built_value = built_value
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def read(self):
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"""Return the value. If necessary, the value is built."""
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self.build()
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if not hasattr(self, 'built_value'):
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self.built_value = self.value
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return self.built_value
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def get_contents(self):
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"""By the assumption that the node.built_value is a
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deterministic product of the sources, the contents of a Value
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are the concatenation of all the contents of its sources. As
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the value need not be built when get_contents() is called, we
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cannot use the actual node.built_value."""
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contents = str(self.value)
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for kid in self.children(None):
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contents = contents + kid.get_contents()
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return contents
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def changed_since_last_build(self, target, prev_ni):
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cur_csig = self.get_csig()
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try:
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return cur_csig != prev_ni.csig
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except AttributeError:
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return 1
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def get_csig(self, calc=None):
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"""Because we're a Python value node and don't have a real
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timestamp, we get to ignore the calculator and just use the
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value contents."""
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try:
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return self.ninfo.csig
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except AttributeError:
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pass
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contents = self.get_contents()
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self.get_ninfo().csig = contents
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return contents
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