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|
"""SCons.Executor
A module for executing actions with specific lists of target and source
Nodes.
"""
#
# __COPYRIGHT__
#
# 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__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
from SCons.Debug import logInstanceCreation
import SCons.Util
class Executor:
"""A class for controlling instances of executing an action.
This largely exists to hold a single association of an action,
environment, list of environment override dictionaries, targets
and sources for later processing as needed.
"""
def __init__(self, action, env=None, overridelist=[],
targets=[], sources=[], builder_kw={}):
if __debug__: logInstanceCreation(self)
if not action:
raise SCons.Errors.UserError, "Executor must have an action."
self.action = action
self.env = env
self.overridelist = overridelist
self.targets = targets
self.sources = sources[:]
self.builder_kw = builder_kw
def get_build_env(self):
"""Fetch or create the appropriate build Environment
for this Executor.
"""
try:
return self.build_env
except AttributeError:
# Create the build environment instance with appropriate
# overrides. These get evaluated against the current
# environment's construction variables so that users can
# add to existing values by referencing the variable in
# the expansion.
overrides = {}
for odict in self.overridelist:
overrides.update(odict)
try:
generate_build_dict = self.targets[0].generate_build_dict
except (AttributeError, IndexError):
pass
else:
overrides.update(generate_build_dict())
import SCons.Defaults
env = self.env or SCons.Defaults.DefaultEnvironment()
self.build_env = env.Override(overrides)
# Update the overrides with the $TARGET/$SOURCE variables for
# this target+source pair, so that evaluations of arbitrary
# Python functions have them in the __env__ environment
# they're passed. Note that the underlying substitution
# functions also override these with their own $TARGET/$SOURCE
# expansions, which is *usually* duplicated effort, but covers
# a corner case where an Action is called directly from within
# a function action with different target and source lists.
self.build_env._update(SCons.Util.subst_dict(self.targets,
self.sources))
return self.build_env
def do_nothing(self, target, errfunc, **kw):
pass
def __call__(self, target, errfunc, **kw):
"""Actually execute the action list."""
kw = kw.copy()
kw.update(self.builder_kw)
apply(self.action, (self.targets, self.sources,
self.get_build_env(), errfunc), kw)
def cleanup(self):
try:
del self.build_env
except AttributeError:
pass
def add_sources(self, sources):
"""Add source files to this Executor's list. This is necessary
for "multi" Builders that can be called repeatedly to build up
a source file list for a given target."""
slist = filter(lambda x, s=self.sources: x not in s, sources)
self.sources.extend(slist)
def __str__(self):
try:
return self.string
except AttributeError:
action = self.action
self.string = action.genstring(self.targets,
self.sources,
self.get_build_env())
return self.string
def nullify(self):
self.__call__ = self.do_nothing
self.string = ''
def get_contents(self):
"""Fetch the signature contents. This, along with
get_raw_contents(), is the real reason this class exists, so we
can compute this once and cache it regardless of how many target
or source Nodes there are.
"""
try:
return self.contents
except AttributeError:
action = self.action
self.contents = action.get_contents(self.targets,
self.sources,
self.get_build_env())
return self.contents
def get_timestamp(self):
"""Fetch a time stamp for this Executor. We don't have one, of
course (only files do), but this is the interface used by the
timestamp module.
"""
return 0
|
