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"""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 4629 2010/01/17 22:23:21 scons"
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'):
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_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:
|
