"""scons.Node.Python

Python nodes.

"""

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__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

import SCons.Node
import time

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.
    """
    def __init__(self, value):
        SCons.Node.Node.__init__(self)
        self.value = value
        self.timestamp = time.time()

    def __str__(self):
        return repr(self.value)

    def build(self):
        """A "builder" for Values."""
        pass

    def current(self, calc):
        """If all of our children were up-to-date, then this
        Value was up-to-date, too."""
        # Allow the children to calculate their signatures.
        calc.bsig(self)
        state = 0
        for kid in self.children(None):
            s = kid.get_state()
            if s and (not state or s > state):
                state = s
        if state == 0 or state == SCons.Node.up_to_date:
            return 1
        else:
            return 0

    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 get_contents(self):
        """The contents of a Value are the concatenation
        of all the contents of its sources with the node's value itself."""
        contents = str(self.value)
        for kid in self.children(None):
            contents = contents + kid.get_contents()
        return contents

    def get_timestamp(self):
        return self.timestamp