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# MIT License
#
# Copyright 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.
"""Python nodes."""
import SCons.Node
_memo_lookup_map = {}
class ValueNodeInfo(SCons.Node.NodeInfoBase):
__slots__ = ('csig',)
current_version_id = 2
field_list = ['csig']
def str_to_node(self, s):
return ValueWithMemo(s)
class ValueBuildInfo(SCons.Node.BuildInfoBase):
__slots__ = ()
current_version_id = 2
class Value(SCons.Node.Node):
"""A Node class for values represented by Python expressions.
Values are typically passed on the command line or generated
by a script, but not from a file or some other source.
.. versionchanged:: 4.0
the *name* parameter was added.
"""
NodeInfo = ValueNodeInfo
BuildInfo = ValueBuildInfo
def __init__(self, value, built_value=None, name=None) -> None:
super().__init__()
self.value = value
self.changed_since_last_build = 6
self.store_info = 0
if built_value is not None:
self.built_value = built_value
# Set a name so it can be a child of a node and not break
# its parent's implementation of Node.get_contents.
if name:
self.name = name
else:
self.name = str(value)
def str_for_display(self):
return repr(self.value)
def __str__(self) -> str:
return str(self.value)
def make_ready(self) -> None:
self.get_csig()
def build(self, **kw) -> None:
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) -> bool:
# Make Value nodes get built regardless of
# what directory scons was run from. Value nodes
# are outside the filesystem:
return True
def write(self, built_value) -> None:
"""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) -> str:
"""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):
# Get csig() value of child as this is more efficent
contents = contents + kid.get_csig()
return contents
def get_contents(self) -> bytes:
"""Get contents for signature calculations."""
return self.get_text_contents().encode()
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.
Returns string. Ideally string of hex digits. (Not bytes)
"""
try:
return self.ninfo.csig
except AttributeError:
pass
contents = self.get_text_contents()
self.get_ninfo().csig = contents
return contents
def ValueWithMemo(value, built_value=None, name=None):
"""Memoized :class:`Value` node factory.
.. versionchanged:: 4.0
the *name* parameter was added.
"""
global _memo_lookup_map
# No current support for memoizing a value that needs to be built.
if built_value:
return Value(value, built_value, name=name)
try:
memo_lookup_key = hash((value, name))
except TypeError:
# Non-primitive types will hit this codepath.
return Value(value, name=name)
try:
return _memo_lookup_map[memo_lookup_key]
except KeyError:
v = Value(value, built_value, name)
_memo_lookup_map[memo_lookup_key] = v
return v
# Local Variables:
# tab-width:4
# indent-tabs-mode:nil
# End:
# vim: set expandtab tabstop=4 shiftwidth=4:
|
