Added an unmodified copy of SCons to third_party.

scons-2.0.1/engine/SCons/Node/Python.py

+"""scons.Node.Python
+
+Python nodes.
+
+"""
+
+#
+# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 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 5134 2010/08/16 23:02:40 bdeegan"
+
+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 built_value is not 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'):
+            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_text_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."""
+        ###TODO: something reasonable about universal newlines
+        contents = str(self.value)
+        for kid in self.children(None):
+            contents = contents + kid.get_contents()
+        return contents
+
+    get_contents = get_text_contents    ###TODO should return 'bytes' value
+
+    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
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: