mirror of
https://github.com/Relintai/pandemonium_engine.git
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1492 lines
56 KiB
Python
1492 lines
56 KiB
Python
# MIT License
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#
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# Copyright The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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"""SCons Actions.
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Information about executing any sort of action that
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can build one or more target Nodes (typically files) from one or more
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source Nodes (also typically files) given a specific Environment.
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The base class here is ActionBase. The base class supplies just a few
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utility methods and some generic methods for displaying information
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about an Action in response to the various commands that control printing.
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A second-level base class is _ActionAction. This extends ActionBase
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by providing the methods that can be used to show and perform an
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action. True Action objects will subclass _ActionAction; Action
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factory class objects will subclass ActionBase.
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The heavy lifting is handled by subclasses for the different types of
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actions we might execute:
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CommandAction
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CommandGeneratorAction
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FunctionAction
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ListAction
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The subclasses supply the following public interface methods used by
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other modules:
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__call__()
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THE public interface, "calling" an Action object executes the
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command or Python function. This also takes care of printing
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a pre-substitution command for debugging purposes.
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get_contents()
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Fetches the "contents" of an Action for signature calculation
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plus the varlist. This is what gets checksummed to decide
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if a target needs to be rebuilt because its action changed.
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genstring()
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Returns a string representation of the Action *without*
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command substitution, but allows a CommandGeneratorAction to
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generate the right action based on the specified target,
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source and env. This is used by the Signature subsystem
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(through the Executor) to obtain an (imprecise) representation
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of the Action operation for informative purposes.
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Subclasses also supply the following methods for internal use within
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this module:
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__str__()
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Returns a string approximation of the Action; no variable
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substitution is performed.
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execute()
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The internal method that really, truly, actually handles the
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execution of a command or Python function. This is used so
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that the __call__() methods can take care of displaying any
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pre-substitution representations, and *then* execute an action
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without worrying about the specific Actions involved.
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get_presig()
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Fetches the "contents" of a subclass for signature calculation.
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The varlist is added to this to produce the Action's contents.
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TODO(?): Change this to always return bytes and not str?
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strfunction()
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Returns a substituted string representation of the Action.
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This is used by the _ActionAction.show() command to display the
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command/function that will be executed to generate the target(s).
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There is a related independent ActionCaller class that looks like a
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regular Action, and which serves as a wrapper for arbitrary functions
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that we want to let the user specify the arguments to now, but actually
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execute later (when an out-of-date check determines that it's needed to
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be executed, for example). Objects of this class are returned by an
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ActionFactory class that provides a __call__() method as a convenient
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way for wrapping up the functions.
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"""
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import os
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import pickle
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import re
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import sys
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import subprocess
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from subprocess import DEVNULL
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import inspect
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from collections import OrderedDict
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import SCons.Debug
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from SCons.Debug import logInstanceCreation
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import SCons.Errors
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import SCons.Util
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import SCons.Subst
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# we use these a lot, so try to optimize them
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from SCons.Util import is_String, is_List
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class _null:
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pass
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print_actions = True
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execute_actions = True
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print_actions_presub = False
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# Use pickle protocol 1 when pickling functions for signature
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# otherwise python3 and python2 will yield different pickles
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# for the same object.
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# This is due to default being 1 for python 2.7, and 3 for 3.x
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# TODO: We can roll this forward to 2 (if it has value), but not
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# before a deprecation cycle as the sconsigns will change
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ACTION_SIGNATURE_PICKLE_PROTOCOL = 1
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def rfile(n):
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try:
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return n.rfile()
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except AttributeError:
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return n
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def default_exitstatfunc(s):
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return s
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strip_quotes = re.compile(r'^[\'"](.*)[\'"]$')
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def _callable_contents(obj):
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"""Return the signature contents of a callable Python object.
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"""
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try:
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# Test if obj is a method.
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return _function_contents(obj.__func__)
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except AttributeError:
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try:
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# Test if obj is a callable object.
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return _function_contents(obj.__call__.__func__)
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except AttributeError:
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try:
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# Test if obj is a code object.
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return _code_contents(obj)
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except AttributeError:
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# Test if obj is a function object.
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return _function_contents(obj)
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def _object_contents(obj):
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"""Return the signature contents of any Python object.
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We have to handle the case where object contains a code object
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since it can be pickled directly.
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"""
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try:
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# Test if obj is a method.
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return _function_contents(obj.__func__)
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except AttributeError:
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try:
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# Test if obj is a callable object.
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return _function_contents(obj.__call__.__func__)
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except AttributeError:
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try:
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# Test if obj is a code object.
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return _code_contents(obj)
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except AttributeError:
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try:
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# Test if obj is a function object.
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return _function_contents(obj)
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except AttributeError as ae:
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# Should be a pickle-able Python object.
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try:
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return _object_instance_content(obj)
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# pickling an Action instance or object doesn't yield a stable
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# content as instance property may be dumped in different orders
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# return pickle.dumps(obj, ACTION_SIGNATURE_PICKLE_PROTOCOL)
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except (pickle.PicklingError, TypeError, AttributeError) as ex:
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# This is weird, but it seems that nested classes
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# are unpickable. The Python docs say it should
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# always be a PicklingError, but some Python
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# versions seem to return TypeError. Just do
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# the best we can.
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return bytearray(repr(obj), 'utf-8')
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def _code_contents(code, docstring=None):
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r"""Return the signature contents of a code object.
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By providing direct access to the code object of the
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function, Python makes this extremely easy. Hooray!
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Unfortunately, older versions of Python include line
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number indications in the compiled byte code. Boo!
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So we remove the line number byte codes to prevent
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recompilations from moving a Python function.
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See:
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- https://docs.python.org/2/library/inspect.html
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- http://python-reference.readthedocs.io/en/latest/docs/code/index.html
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For info on what each co\_ variable provides
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The signature is as follows (should be byte/chars):
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co_argcount, len(co_varnames), len(co_cellvars), len(co_freevars),
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( comma separated signature for each object in co_consts ),
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( comma separated signature for each object in co_names ),
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( The bytecode with line number bytecodes removed from co_code )
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co_argcount - Returns the number of positional arguments (including arguments with default values).
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co_varnames - Returns a tuple containing the names of the local variables (starting with the argument names).
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co_cellvars - Returns a tuple containing the names of local variables that are referenced by nested functions.
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co_freevars - Returns a tuple containing the names of free variables. (?)
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co_consts - Returns a tuple containing the literals used by the bytecode.
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co_names - Returns a tuple containing the names used by the bytecode.
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co_code - Returns a string representing the sequence of bytecode instructions.
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"""
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# contents = []
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# The code contents depends on the number of local variables
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# but not their actual names.
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contents = bytearray("{}, {}".format(code.co_argcount, len(code.co_varnames)), 'utf-8')
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contents.extend(b", ")
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contents.extend(bytearray(str(len(code.co_cellvars)), 'utf-8'))
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contents.extend(b", ")
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contents.extend(bytearray(str(len(code.co_freevars)), 'utf-8'))
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# The code contents depends on any constants accessed by the
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# function. Note that we have to call _object_contents on each
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# constants because the code object of nested functions can
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# show-up among the constants.
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z = [_object_contents(cc) for cc in code.co_consts if cc != docstring]
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contents.extend(b',(')
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contents.extend(bytearray(',', 'utf-8').join(z))
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contents.extend(b')')
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# The code contents depends on the variable names used to
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# accessed global variable, as changing the variable name changes
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# the variable actually accessed and therefore changes the
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# function result.
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z= [bytearray(_object_contents(cc)) for cc in code.co_names]
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contents.extend(b',(')
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contents.extend(bytearray(',','utf-8').join(z))
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contents.extend(b')')
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# The code contents depends on its actual code!!!
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contents.extend(b',(')
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contents.extend(code.co_code)
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contents.extend(b')')
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return contents
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def _function_contents(func):
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"""
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The signature is as follows (should be byte/chars):
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< _code_contents (see above) from func.__code__ >
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,( comma separated _object_contents for function argument defaults)
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,( comma separated _object_contents for any closure contents )
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See also: https://docs.python.org/3/reference/datamodel.html
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- func.__code__ - The code object representing the compiled function body.
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- func.__defaults__ - A tuple containing default argument values for those arguments that have defaults, or None if no arguments have a default value
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- func.__closure__ - None or a tuple of cells that contain bindings for the function's free variables.
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:Returns:
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Signature contents of a function. (in bytes)
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"""
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contents = [_code_contents(func.__code__, func.__doc__)]
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# The function contents depends on the value of defaults arguments
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if func.__defaults__:
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function_defaults_contents = [_object_contents(cc) for cc in func.__defaults__]
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defaults = bytearray(b',(')
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defaults.extend(bytearray(b',').join(function_defaults_contents))
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defaults.extend(b')')
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contents.append(defaults)
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else:
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contents.append(b',()')
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# The function contents depends on the closure captured cell values.
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closure = func.__closure__ or []
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try:
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closure_contents = [_object_contents(x.cell_contents) for x in closure]
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except AttributeError:
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closure_contents = []
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contents.append(b',(')
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contents.append(bytearray(b',').join(closure_contents))
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contents.append(b')')
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retval = bytearray(b'').join(contents)
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return retval
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def _object_instance_content(obj):
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"""
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Returns consistant content for a action class or an instance thereof
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:Parameters:
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- `obj` Should be either and action class or an instance thereof
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:Returns:
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bytearray or bytes representing the obj suitable for generating a signature from.
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"""
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retval = bytearray()
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if obj is None:
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return b'N.'
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if isinstance(obj, SCons.Util.BaseStringTypes):
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return SCons.Util.to_bytes(obj)
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inst_class = obj.__class__
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inst_class_name = bytearray(obj.__class__.__name__,'utf-8')
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inst_class_module = bytearray(obj.__class__.__module__,'utf-8')
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inst_class_hierarchy = bytearray(repr(inspect.getclasstree([obj.__class__,])),'utf-8')
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# print("ICH:%s : %s"%(inst_class_hierarchy, repr(obj)))
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properties = [(p, getattr(obj, p, "None")) for p in dir(obj) if not (p[:2] == '__' or inspect.ismethod(getattr(obj, p)) or inspect.isbuiltin(getattr(obj,p))) ]
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properties.sort()
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properties_str = ','.join(["%s=%s"%(p[0],p[1]) for p in properties])
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properties_bytes = bytearray(properties_str,'utf-8')
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methods = [p for p in dir(obj) if inspect.ismethod(getattr(obj, p))]
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methods.sort()
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method_contents = []
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for m in methods:
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# print("Method:%s"%m)
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v = _function_contents(getattr(obj, m))
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# print("[%s->]V:%s [%s]"%(m,v,type(v)))
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method_contents.append(v)
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retval = bytearray(b'{')
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retval.extend(inst_class_name)
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retval.extend(b":")
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retval.extend(inst_class_module)
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retval.extend(b'}[[')
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retval.extend(inst_class_hierarchy)
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retval.extend(b']]{{')
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retval.extend(bytearray(b",").join(method_contents))
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retval.extend(b"}}{{{")
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retval.extend(properties_bytes)
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retval.extend(b'}}}')
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return retval
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# print("class :%s"%inst_class)
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# print("class_name :%s"%inst_class_name)
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# print("class_module :%s"%inst_class_module)
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# print("Class hier :\n%s"%pp.pformat(inst_class_hierarchy))
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# print("Inst Properties:\n%s"%pp.pformat(properties))
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# print("Inst Methods :\n%s"%pp.pformat(methods))
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def _actionAppend(act1, act2):
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# This function knows how to slap two actions together.
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# Mainly, it handles ListActions by concatenating into
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# a single ListAction.
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a1 = Action(act1)
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a2 = Action(act2)
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if a1 is None:
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return a2
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if a2 is None:
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return a1
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if isinstance(a1, ListAction):
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if isinstance(a2, ListAction):
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return ListAction(a1.list + a2.list)
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else:
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return ListAction(a1.list + [ a2 ])
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else:
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if isinstance(a2, ListAction):
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return ListAction([ a1 ] + a2.list)
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else:
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return ListAction([ a1, a2 ])
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def _do_create_keywords(args, kw):
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"""This converts any arguments after the action argument into
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their equivalent keywords and adds them to the kw argument.
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"""
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v = kw.get('varlist', ())
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# prevent varlist="FOO" from being interpreted as ['F', 'O', 'O']
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if is_String(v): v = (v,)
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kw['varlist'] = tuple(v)
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if args:
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# turn positional args into equivalent keywords
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cmdstrfunc = args[0]
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if cmdstrfunc is None or is_String(cmdstrfunc):
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kw['cmdstr'] = cmdstrfunc
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elif callable(cmdstrfunc):
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kw['strfunction'] = cmdstrfunc
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else:
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raise SCons.Errors.UserError(
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'Invalid command display variable type. '
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'You must either pass a string or a callback which '
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'accepts (target, source, env) as parameters.')
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if len(args) > 1:
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kw['varlist'] = tuple(SCons.Util.flatten(args[1:])) + kw['varlist']
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if kw.get('strfunction', _null) is not _null \
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and kw.get('cmdstr', _null) is not _null:
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raise SCons.Errors.UserError(
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'Cannot have both strfunction and cmdstr args to Action()')
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def _do_create_action(act, kw):
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"""This is the actual "implementation" for the
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Action factory method, below. This handles the
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fact that passing lists to Action() itself has
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different semantics than passing lists as elements
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of lists.
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The former will create a ListAction, the latter
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will create a CommandAction by converting the inner
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list elements to strings."""
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if isinstance(act, ActionBase):
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return act
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if is_String(act):
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var=SCons.Util.get_environment_var(act)
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if var:
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# This looks like a string that is purely an Environment
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# variable reference, like "$FOO" or "${FOO}". We do
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# something special here...we lazily evaluate the contents
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# of that Environment variable, so a user could put something
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# like a function or a CommandGenerator in that variable
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# instead of a string.
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return LazyAction(var, kw)
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commands = str(act).split('\n')
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if len(commands) == 1:
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return CommandAction(commands[0], **kw)
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# The list of string commands may include a LazyAction, so we
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# reprocess them via _do_create_list_action.
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return _do_create_list_action(commands, kw)
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if is_List(act):
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return CommandAction(act, **kw)
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if callable(act):
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try:
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gen = kw['generator']
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del kw['generator']
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except KeyError:
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gen = 0
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if gen:
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action_type = CommandGeneratorAction
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else:
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action_type = FunctionAction
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return action_type(act, kw)
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# Catch a common error case with a nice message:
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if isinstance(act, int) or isinstance(act, float):
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raise TypeError("Don't know how to create an Action from a number (%s)"%act)
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# Else fail silently (???)
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return None
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def _do_create_list_action(act, kw):
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"""A factory for list actions. Convert the input list into Actions
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and then wrap them in a ListAction."""
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acts = []
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for a in act:
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aa = _do_create_action(a, kw)
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if aa is not None: acts.append(aa)
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if not acts:
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return ListAction([])
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elif len(acts) == 1:
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return acts[0]
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else:
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return ListAction(acts)
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def Action(act, *args, **kw):
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"""A factory for action objects."""
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# Really simple: the _do_create_* routines do the heavy lifting.
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_do_create_keywords(args, kw)
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if is_List(act):
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return _do_create_list_action(act, kw)
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return _do_create_action(act, kw)
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|
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class ActionBase:
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"""Base class for all types of action objects that can be held by
|
|
other objects (Builders, Executors, etc.) This provides the
|
|
common methods for manipulating and combining those actions."""
|
|
|
|
def __eq__(self, other):
|
|
return self.__dict__ == other
|
|
|
|
def no_batch_key(self, env, target, source):
|
|
return None
|
|
|
|
batch_key = no_batch_key
|
|
|
|
def genstring(self, target, source, env):
|
|
return str(self)
|
|
|
|
def get_contents(self, target, source, env):
|
|
result = self.get_presig(target, source, env)
|
|
|
|
if not isinstance(result,(bytes, bytearray)):
|
|
result = bytearray(result, 'utf-8')
|
|
else:
|
|
# Make a copy and put in bytearray, without this the contents returned by get_presig
|
|
# can be changed by the logic below, appending with each call and causing very
|
|
# hard to track down issues...
|
|
result = bytearray(result)
|
|
|
|
# At this point everything should be a bytearray
|
|
|
|
# This should never happen, as the Action() factory should wrap
|
|
# the varlist, but just in case an action is created directly,
|
|
# we duplicate this check here.
|
|
vl = self.get_varlist(target, source, env)
|
|
if is_String(vl): vl = (vl,)
|
|
for v in vl:
|
|
# do the subst this way to ignore $(...$) parts:
|
|
if isinstance(result, bytearray):
|
|
result.extend(SCons.Util.to_bytes(env.subst_target_source('${'+v+'}', SCons.Subst.SUBST_SIG, target, source)))
|
|
else:
|
|
raise Exception("WE SHOULD NEVER GET HERE result should be bytearray not:%s"%type(result))
|
|
# result.append(SCons.Util.to_bytes(env.subst_target_source('${'+v+'}', SCons.Subst.SUBST_SIG, target, source)))
|
|
|
|
|
|
if isinstance(result, (bytes,bytearray)):
|
|
return result
|
|
else:
|
|
raise Exception("WE SHOULD NEVER GET HERE - #2 result should be bytearray not:%s" % type(result))
|
|
# return b''.join(result)
|
|
|
|
def __add__(self, other):
|
|
return _actionAppend(self, other)
|
|
|
|
def __radd__(self, other):
|
|
return _actionAppend(other, self)
|
|
|
|
def presub_lines(self, env):
|
|
# CommandGeneratorAction needs a real environment
|
|
# in order to return the proper string here, since
|
|
# it may call LazyAction, which looks up a key
|
|
# in that env. So we temporarily remember the env here,
|
|
# and CommandGeneratorAction will use this env
|
|
# when it calls its _generate method.
|
|
self.presub_env = env
|
|
lines = str(self).split('\n')
|
|
self.presub_env = None # don't need this any more
|
|
return lines
|
|
|
|
def get_varlist(self, target, source, env, executor=None):
|
|
return self.varlist
|
|
|
|
def get_targets(self, env, executor):
|
|
"""
|
|
Returns the type of targets ($TARGETS, $CHANGED_TARGETS) used
|
|
by this action.
|
|
"""
|
|
return self.targets
|
|
|
|
|
|
class _ActionAction(ActionBase):
|
|
"""Base class for actions that create output objects."""
|
|
def __init__(self, cmdstr=_null, strfunction=_null, varlist=(),
|
|
presub=_null, chdir=None, exitstatfunc=None,
|
|
batch_key=None, targets='$TARGETS',
|
|
**kw):
|
|
self.cmdstr = cmdstr
|
|
if strfunction is not _null:
|
|
if strfunction is None:
|
|
self.cmdstr = None
|
|
else:
|
|
self.strfunction = strfunction
|
|
self.varlist = varlist
|
|
self.presub = presub
|
|
self.chdir = chdir
|
|
if not exitstatfunc:
|
|
exitstatfunc = default_exitstatfunc
|
|
self.exitstatfunc = exitstatfunc
|
|
|
|
self.targets = targets
|
|
|
|
if batch_key:
|
|
if not callable(batch_key):
|
|
# They have set batch_key, but not to their own
|
|
# callable. The default behavior here will batch
|
|
# *all* targets+sources using this action, separated
|
|
# for each construction environment.
|
|
def default_batch_key(self, env, target, source):
|
|
return (id(self), id(env))
|
|
batch_key = default_batch_key
|
|
SCons.Util.AddMethod(self, batch_key, 'batch_key')
|
|
|
|
def print_cmd_line(self, s, target, source, env):
|
|
"""
|
|
In python 3, and in some of our tests, sys.stdout is
|
|
a String io object, and it takes unicode strings only
|
|
This code assumes s is a regular string.
|
|
"""
|
|
sys.stdout.write(s + "\n")
|
|
|
|
def __call__(self, target, source, env,
|
|
exitstatfunc=_null,
|
|
presub=_null,
|
|
show=_null,
|
|
execute=_null,
|
|
chdir=_null,
|
|
executor=None):
|
|
if not is_List(target):
|
|
target = [target]
|
|
if not is_List(source):
|
|
source = [source]
|
|
|
|
if presub is _null:
|
|
presub = self.presub
|
|
if presub is _null:
|
|
presub = print_actions_presub
|
|
if exitstatfunc is _null:
|
|
exitstatfunc = self.exitstatfunc
|
|
if show is _null:
|
|
show = print_actions
|
|
if execute is _null:
|
|
execute = execute_actions
|
|
if chdir is _null:
|
|
chdir = self.chdir
|
|
save_cwd = None
|
|
if chdir:
|
|
save_cwd = os.getcwd()
|
|
try:
|
|
chdir = str(chdir.get_abspath())
|
|
except AttributeError:
|
|
if not is_String(chdir):
|
|
if executor:
|
|
chdir = str(executor.batches[0].targets[0].dir)
|
|
else:
|
|
chdir = str(target[0].dir)
|
|
if presub:
|
|
if executor:
|
|
target = executor.get_all_targets()
|
|
source = executor.get_all_sources()
|
|
t = ' and '.join(map(str, target))
|
|
l = '\n '.join(self.presub_lines(env))
|
|
out = "Building %s with action:\n %s\n" % (t, l)
|
|
sys.stdout.write(out)
|
|
cmd = None
|
|
if show and self.strfunction:
|
|
if executor:
|
|
target = executor.get_all_targets()
|
|
source = executor.get_all_sources()
|
|
try:
|
|
cmd = self.strfunction(target, source, env, executor)
|
|
except TypeError:
|
|
cmd = self.strfunction(target, source, env)
|
|
if cmd:
|
|
if chdir:
|
|
cmd = ('os.chdir(%s)\n' % repr(chdir)) + cmd
|
|
try:
|
|
get = env.get
|
|
except AttributeError:
|
|
print_func = self.print_cmd_line
|
|
else:
|
|
print_func = get('PRINT_CMD_LINE_FUNC')
|
|
if not print_func:
|
|
print_func = self.print_cmd_line
|
|
print_func(cmd, target, source, env)
|
|
stat = 0
|
|
if execute:
|
|
if chdir:
|
|
os.chdir(chdir)
|
|
try:
|
|
stat = self.execute(target, source, env, executor=executor)
|
|
if isinstance(stat, SCons.Errors.BuildError):
|
|
s = exitstatfunc(stat.status)
|
|
if s:
|
|
stat.status = s
|
|
else:
|
|
stat = s
|
|
else:
|
|
stat = exitstatfunc(stat)
|
|
finally:
|
|
if save_cwd:
|
|
os.chdir(save_cwd)
|
|
if cmd and save_cwd:
|
|
print_func('os.chdir(%s)' % repr(save_cwd), target, source, env)
|
|
|
|
return stat
|
|
|
|
|
|
def _string_from_cmd_list(cmd_list):
|
|
"""Takes a list of command line arguments and returns a pretty
|
|
representation for printing."""
|
|
cl = []
|
|
for arg in map(str, cmd_list):
|
|
if ' ' in arg or '\t' in arg:
|
|
arg = '"' + arg + '"'
|
|
cl.append(arg)
|
|
return ' '.join(cl)
|
|
|
|
default_ENV = None
|
|
|
|
|
|
def get_default_ENV(env):
|
|
"""
|
|
A fiddlin' little function that has an 'import SCons.Environment' which
|
|
can't be moved to the top level without creating an import loop. Since
|
|
this import creates a local variable named 'SCons', it blocks access to
|
|
the global variable, so we move it here to prevent complaints about local
|
|
variables being used uninitialized.
|
|
"""
|
|
global default_ENV
|
|
try:
|
|
return env['ENV']
|
|
except KeyError:
|
|
if not default_ENV:
|
|
import SCons.Environment
|
|
# This is a hideously expensive way to get a default shell
|
|
# environment. What it really should do is run the platform
|
|
# setup to get the default ENV. Fortunately, it's incredibly
|
|
# rare for an Environment not to have a shell environment, so
|
|
# we're not going to worry about it overmuch.
|
|
default_ENV = SCons.Environment.Environment()['ENV']
|
|
return default_ENV
|
|
|
|
|
|
def _subproc(scons_env, cmd, error='ignore', **kw):
|
|
"""Wrapper for subprocess which pulls from construction env.
|
|
|
|
Use for calls to subprocess which need to interpolate values from
|
|
an SCons construction environment into the environment passed to
|
|
subprocess. Adds an an error-handling argument. Adds ability
|
|
to specify std{in,out,err} with "'devnull'" tag.
|
|
"""
|
|
# TODO: just uses subprocess.DEVNULL now, we can drop the "devnull"
|
|
# string now - it is a holdover from Py2, which didn't have DEVNULL.
|
|
for stream in 'stdin', 'stdout', 'stderr':
|
|
io = kw.get(stream)
|
|
if is_String(io) and io == 'devnull':
|
|
kw[stream] = DEVNULL
|
|
|
|
# Figure out what shell environment to use
|
|
ENV = kw.get('env', None)
|
|
if ENV is None: ENV = get_default_ENV(scons_env)
|
|
|
|
# Ensure that the ENV values are all strings:
|
|
new_env = {}
|
|
for key, value in ENV.items():
|
|
if is_List(value):
|
|
# If the value is a list, then we assume it is a path list,
|
|
# because that's a pretty common list-like value to stick
|
|
# in an environment variable:
|
|
value = SCons.Util.flatten_sequence(value)
|
|
new_env[key] = os.pathsep.join(map(str, value))
|
|
else:
|
|
# It's either a string or something else. If it's a string,
|
|
# we still want to call str() because it might be a *Unicode*
|
|
# string, which makes subprocess.Popen() gag. If it isn't a
|
|
# string or a list, then we just coerce it to a string, which
|
|
# is the proper way to handle Dir and File instances and will
|
|
# produce something reasonable for just about everything else:
|
|
new_env[key] = str(value)
|
|
kw['env'] = new_env
|
|
|
|
try:
|
|
pobj = subprocess.Popen(cmd, **kw)
|
|
except EnvironmentError as e:
|
|
if error == 'raise': raise
|
|
# return a dummy Popen instance that only returns error
|
|
class dummyPopen:
|
|
def __init__(self, e):
|
|
self.exception = e
|
|
# Add the following two to enable using the return value as a context manager
|
|
# for example
|
|
# with Action._subproc(...) as po:
|
|
# logic here which uses po
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, *args):
|
|
pass
|
|
|
|
def communicate(self, input=None):
|
|
return ('', '')
|
|
|
|
def wait(self):
|
|
return -self.exception.errno
|
|
|
|
stdin = None
|
|
class f:
|
|
def read(self): return ''
|
|
def readline(self): return ''
|
|
def __iter__(self): return iter(())
|
|
stdout = stderr = f()
|
|
pobj = dummyPopen(e)
|
|
finally:
|
|
# clean up open file handles stored in parent's kw
|
|
for k, v in kw.items():
|
|
if inspect.ismethod(getattr(v, 'close', None)):
|
|
v.close()
|
|
|
|
return pobj
|
|
|
|
|
|
class CommandAction(_ActionAction):
|
|
"""Class for command-execution actions."""
|
|
def __init__(self, cmd, **kw):
|
|
# Cmd can actually be a list or a single item; if it's a
|
|
# single item it should be the command string to execute; if a
|
|
# list then it should be the words of the command string to
|
|
# execute. Only a single command should be executed by this
|
|
# object; lists of commands should be handled by embedding
|
|
# these objects in a ListAction object (which the Action()
|
|
# factory above does). cmd will be passed to
|
|
# Environment.subst_list() for substituting environment
|
|
# variables.
|
|
if SCons.Debug.track_instances: logInstanceCreation(self, 'Action.CommandAction')
|
|
|
|
_ActionAction.__init__(self, **kw)
|
|
if is_List(cmd):
|
|
if [c for c in cmd if is_List(c)]:
|
|
raise TypeError("CommandAction should be given only "
|
|
"a single command")
|
|
self.cmd_list = cmd
|
|
|
|
def __str__(self):
|
|
if is_List(self.cmd_list):
|
|
return ' '.join(map(str, self.cmd_list))
|
|
return str(self.cmd_list)
|
|
|
|
def process(self, target, source, env, executor=None):
|
|
if executor:
|
|
result = env.subst_list(self.cmd_list, 0, executor=executor)
|
|
else:
|
|
result = env.subst_list(self.cmd_list, 0, target, source)
|
|
silent = None
|
|
ignore = None
|
|
while True:
|
|
try: c = result[0][0][0]
|
|
except IndexError: c = None
|
|
if c == '@': silent = 1
|
|
elif c == '-': ignore = 1
|
|
else: break
|
|
result[0][0] = result[0][0][1:]
|
|
try:
|
|
if not result[0][0]:
|
|
result[0] = result[0][1:]
|
|
except IndexError:
|
|
pass
|
|
return result, ignore, silent
|
|
|
|
def strfunction(self, target, source, env, executor=None):
|
|
if self.cmdstr is None:
|
|
return None
|
|
if self.cmdstr is not _null:
|
|
from SCons.Subst import SUBST_RAW
|
|
if executor:
|
|
c = env.subst(self.cmdstr, SUBST_RAW, executor=executor)
|
|
else:
|
|
c = env.subst(self.cmdstr, SUBST_RAW, target, source)
|
|
if c:
|
|
return c
|
|
cmd_list, ignore, silent = self.process(target, source, env, executor)
|
|
if silent:
|
|
return ''
|
|
return _string_from_cmd_list(cmd_list[0])
|
|
|
|
def execute(self, target, source, env, executor=None):
|
|
"""Execute a command action.
|
|
|
|
This will handle lists of commands as well as individual commands,
|
|
because construction variable substitution may turn a single
|
|
"command" into a list. This means that this class can actually
|
|
handle lists of commands, even though that's not how we use it
|
|
externally.
|
|
"""
|
|
escape_list = SCons.Subst.escape_list
|
|
flatten_sequence = SCons.Util.flatten_sequence
|
|
|
|
try:
|
|
shell = env['SHELL']
|
|
except KeyError:
|
|
raise SCons.Errors.UserError('Missing SHELL construction variable.')
|
|
|
|
try:
|
|
spawn = env['SPAWN']
|
|
except KeyError:
|
|
raise SCons.Errors.UserError('Missing SPAWN construction variable.')
|
|
else:
|
|
if is_String(spawn):
|
|
spawn = env.subst(spawn, raw=1, conv=lambda x: x)
|
|
|
|
escape = env.get('ESCAPE', lambda x: x)
|
|
|
|
ENV = get_default_ENV(env)
|
|
|
|
# Ensure that the ENV values are all strings:
|
|
for key, value in ENV.items():
|
|
if not is_String(value):
|
|
if is_List(value):
|
|
# If the value is a list, then we assume it is a
|
|
# path list, because that's a pretty common list-like
|
|
# value to stick in an environment variable:
|
|
value = flatten_sequence(value)
|
|
ENV[key] = os.pathsep.join(map(str, value))
|
|
else:
|
|
# If it isn't a string or a list, then we just coerce
|
|
# it to a string, which is the proper way to handle
|
|
# Dir and File instances and will produce something
|
|
# reasonable for just about everything else:
|
|
ENV[key] = str(value)
|
|
|
|
if executor:
|
|
target = executor.get_all_targets()
|
|
source = executor.get_all_sources()
|
|
cmd_list, ignore, silent = self.process(target, list(map(rfile, source)), env, executor)
|
|
|
|
# Use len() to filter out any "command" that's zero-length.
|
|
for cmd_line in filter(len, cmd_list):
|
|
# Escape the command line for the interpreter we are using.
|
|
cmd_line = escape_list(cmd_line, escape)
|
|
result = spawn(shell, escape, cmd_line[0], cmd_line, ENV)
|
|
if not ignore and result:
|
|
msg = "Error %s" % result
|
|
return SCons.Errors.BuildError(errstr=msg,
|
|
status=result,
|
|
action=self,
|
|
command=cmd_line)
|
|
return 0
|
|
|
|
def get_presig(self, target, source, env, executor=None):
|
|
"""Return the signature contents of this action's command line.
|
|
|
|
This strips $(-$) and everything in between the string,
|
|
since those parts don't affect signatures.
|
|
"""
|
|
from SCons.Subst import SUBST_SIG
|
|
cmd = self.cmd_list
|
|
if is_List(cmd):
|
|
cmd = ' '.join(map(str, cmd))
|
|
else:
|
|
cmd = str(cmd)
|
|
if executor:
|
|
return env.subst_target_source(cmd, SUBST_SIG, executor=executor)
|
|
else:
|
|
return env.subst_target_source(cmd, SUBST_SIG, target, source)
|
|
|
|
def get_implicit_deps(self, target, source, env, executor=None):
|
|
"""Return the implicit dependencies of this action's command line."""
|
|
icd = env.get('IMPLICIT_COMMAND_DEPENDENCIES', True)
|
|
if is_String(icd) and icd[:1] == '$':
|
|
icd = env.subst(icd)
|
|
|
|
if not icd or str(icd).lower() in ('0', 'none', 'false', 'no', 'off'):
|
|
return []
|
|
|
|
try:
|
|
icd_int = int(icd)
|
|
except ValueError:
|
|
icd_int = None
|
|
|
|
if (icd_int and icd_int > 1) or str(icd).lower() == 'all':
|
|
# An integer value greater than 1 specifies the number of entries
|
|
# to scan. "all" means to scan all.
|
|
return self._get_implicit_deps_heavyweight(target, source, env, executor, icd_int)
|
|
else:
|
|
# Everything else (usually 1 or True) means that we want
|
|
# lightweight dependency scanning.
|
|
return self._get_implicit_deps_lightweight(target, source, env, executor)
|
|
|
|
def _get_implicit_deps_lightweight(self, target, source, env, executor):
|
|
"""
|
|
Lightweight dependency scanning involves only scanning the first entry
|
|
in an action string, even if it contains &&.
|
|
"""
|
|
from SCons.Subst import SUBST_SIG
|
|
if executor:
|
|
cmd_list = env.subst_list(self.cmd_list, SUBST_SIG, executor=executor)
|
|
else:
|
|
cmd_list = env.subst_list(self.cmd_list, SUBST_SIG, target, source)
|
|
res = []
|
|
for cmd_line in cmd_list:
|
|
if cmd_line:
|
|
d = str(cmd_line[0])
|
|
m = strip_quotes.match(d)
|
|
if m:
|
|
d = m.group(1)
|
|
d = env.WhereIs(d)
|
|
if d:
|
|
res.append(env.fs.File(d))
|
|
return res
|
|
|
|
def _get_implicit_deps_heavyweight(self, target, source, env, executor,
|
|
icd_int):
|
|
"""
|
|
Heavyweight dependency scanning involves scanning more than just the
|
|
first entry in an action string. The exact behavior depends on the
|
|
value of icd_int. Only files are taken as implicit dependencies;
|
|
directories are ignored.
|
|
|
|
If icd_int is an integer value, it specifies the number of entries to
|
|
scan for implicit dependencies. Action strings are also scanned after
|
|
a &&. So for example, if icd_int=2 and the action string is
|
|
"cd <some_dir> && $PYTHON $SCRIPT_PATH <another_path>", the implicit
|
|
dependencies would be the path to the python binary and the path to the
|
|
script.
|
|
|
|
If icd_int is None, all entries are scanned for implicit dependencies.
|
|
"""
|
|
|
|
# Avoid circular and duplicate dependencies by not providing source,
|
|
# target, or executor to subst_list. This causes references to
|
|
# $SOURCES, $TARGETS, and all related variables to disappear.
|
|
from SCons.Subst import SUBST_SIG
|
|
cmd_list = env.subst_list(self.cmd_list, SUBST_SIG, conv=lambda x: x)
|
|
res = []
|
|
|
|
for cmd_line in cmd_list:
|
|
if cmd_line:
|
|
entry_count = 0
|
|
for entry in cmd_line:
|
|
d = str(entry)
|
|
if ((icd_int is None or entry_count < icd_int) and
|
|
not d.startswith(('&', '-', '/') if os.name == 'nt'
|
|
else ('&', '-'))):
|
|
m = strip_quotes.match(d)
|
|
if m:
|
|
d = m.group(1)
|
|
|
|
if d:
|
|
# Resolve the first entry in the command string using
|
|
# PATH, which env.WhereIs() looks in.
|
|
# For now, only match files, not directories.
|
|
p = os.path.abspath(d) if os.path.isfile(d) else None
|
|
if not p and entry_count == 0:
|
|
p = env.WhereIs(d)
|
|
|
|
if p:
|
|
res.append(env.fs.File(p))
|
|
|
|
entry_count = entry_count + 1
|
|
else:
|
|
entry_count = 0 if d == '&&' else entry_count + 1
|
|
|
|
# Despite not providing source and target to env.subst() above, we
|
|
# can still end up with sources in this list. For example, files in
|
|
# LIBS will still resolve in env.subst(). This won't result in
|
|
# circular dependencies, but it causes problems with cache signatures
|
|
# changing between full and incremental builds.
|
|
return [r for r in res if r not in target and r not in source]
|
|
|
|
|
|
class CommandGeneratorAction(ActionBase):
|
|
"""Class for command-generator actions."""
|
|
def __init__(self, generator, kw):
|
|
if SCons.Debug.track_instances: logInstanceCreation(self, 'Action.CommandGeneratorAction')
|
|
self.generator = generator
|
|
self.gen_kw = kw
|
|
self.varlist = kw.get('varlist', ())
|
|
self.targets = kw.get('targets', '$TARGETS')
|
|
|
|
def _generate(self, target, source, env, for_signature, executor=None):
|
|
# ensure that target is a list, to make it easier to write
|
|
# generator functions:
|
|
if not is_List(target):
|
|
target = [target]
|
|
|
|
if executor:
|
|
target = executor.get_all_targets()
|
|
source = executor.get_all_sources()
|
|
ret = self.generator(target=target,
|
|
source=source,
|
|
env=env,
|
|
for_signature=for_signature)
|
|
gen_cmd = Action(ret, **self.gen_kw)
|
|
if not gen_cmd:
|
|
raise SCons.Errors.UserError("Object returned from command generator: %s cannot be used to create an Action." % repr(ret))
|
|
return gen_cmd
|
|
|
|
def __str__(self):
|
|
try:
|
|
env = self.presub_env
|
|
except AttributeError:
|
|
env = None
|
|
if env is None:
|
|
env = SCons.Defaults.DefaultEnvironment()
|
|
act = self._generate([], [], env, 1)
|
|
return str(act)
|
|
|
|
def batch_key(self, env, target, source):
|
|
return self._generate(target, source, env, 1).batch_key(env, target, source)
|
|
|
|
def genstring(self, target, source, env, executor=None):
|
|
return self._generate(target, source, env, 1, executor).genstring(target, source, env)
|
|
|
|
def __call__(self, target, source, env, exitstatfunc=_null, presub=_null,
|
|
show=_null, execute=_null, chdir=_null, executor=None):
|
|
act = self._generate(target, source, env, 0, executor)
|
|
if act is None:
|
|
raise SCons.Errors.UserError(
|
|
"While building `%s': "
|
|
"Cannot deduce file extension from source files: %s"
|
|
% (repr(list(map(str, target))), repr(list(map(str, source))))
|
|
)
|
|
return act(
|
|
target, source, env, exitstatfunc, presub, show, execute, chdir, executor
|
|
)
|
|
|
|
def get_presig(self, target, source, env, executor=None):
|
|
"""Return the signature contents of this action's command line.
|
|
|
|
This strips $(-$) and everything in between the string,
|
|
since those parts don't affect signatures.
|
|
"""
|
|
return self._generate(target, source, env, 1, executor).get_presig(target, source, env)
|
|
|
|
def get_implicit_deps(self, target, source, env, executor=None):
|
|
return self._generate(target, source, env, 1, executor).get_implicit_deps(target, source, env)
|
|
|
|
def get_varlist(self, target, source, env, executor=None):
|
|
return self._generate(target, source, env, 1, executor).get_varlist(target, source, env, executor)
|
|
|
|
def get_targets(self, env, executor):
|
|
return self._generate(None, None, env, 1, executor).get_targets(env, executor)
|
|
|
|
|
|
class LazyAction(CommandGeneratorAction, CommandAction):
|
|
"""
|
|
A LazyAction is a kind of hybrid generator and command action for
|
|
strings of the form "$VAR". These strings normally expand to other
|
|
strings (think "$CCCOM" to "$CC -c -o $TARGET $SOURCE"), but we also
|
|
want to be able to replace them with functions in the construction
|
|
environment. Consequently, we want lazy evaluation and creation of
|
|
an Action in the case of the function, but that's overkill in the more
|
|
normal case of expansion to other strings.
|
|
|
|
So we do this with a subclass that's both a generator *and*
|
|
a command action. The overridden methods all do a quick check
|
|
of the construction variable, and if it's a string we just call
|
|
the corresponding CommandAction method to do the heavy lifting.
|
|
If not, then we call the same-named CommandGeneratorAction method.
|
|
The CommandGeneratorAction methods work by using the overridden
|
|
_generate() method, that is, our own way of handling "generation" of
|
|
an action based on what's in the construction variable.
|
|
"""
|
|
|
|
def __init__(self, var, kw):
|
|
if SCons.Debug.track_instances: logInstanceCreation(self, 'Action.LazyAction')
|
|
CommandAction.__init__(self, '${'+var+'}', **kw)
|
|
self.var = SCons.Util.to_String(var)
|
|
self.gen_kw = kw
|
|
|
|
def get_parent_class(self, env):
|
|
c = env.get(self.var)
|
|
if is_String(c) and '\n' not in c:
|
|
return CommandAction
|
|
return CommandGeneratorAction
|
|
|
|
def _generate_cache(self, env):
|
|
if env:
|
|
c = env.get(self.var, '')
|
|
else:
|
|
c = ''
|
|
gen_cmd = Action(c, **self.gen_kw)
|
|
if not gen_cmd:
|
|
raise SCons.Errors.UserError("$%s value %s cannot be used to create an Action." % (self.var, repr(c)))
|
|
return gen_cmd
|
|
|
|
def _generate(self, target, source, env, for_signature, executor=None):
|
|
return self._generate_cache(env)
|
|
|
|
def __call__(self, target, source, env, *args, **kw):
|
|
c = self.get_parent_class(env)
|
|
return c.__call__(self, target, source, env, *args, **kw)
|
|
|
|
def get_presig(self, target, source, env):
|
|
c = self.get_parent_class(env)
|
|
return c.get_presig(self, target, source, env)
|
|
|
|
def get_varlist(self, target, source, env, executor=None):
|
|
c = self.get_parent_class(env)
|
|
return c.get_varlist(self, target, source, env, executor)
|
|
|
|
|
|
class FunctionAction(_ActionAction):
|
|
"""Class for Python function actions."""
|
|
|
|
def __init__(self, execfunction, kw):
|
|
if SCons.Debug.track_instances: logInstanceCreation(self, 'Action.FunctionAction')
|
|
|
|
self.execfunction = execfunction
|
|
try:
|
|
self.funccontents = _callable_contents(execfunction)
|
|
except AttributeError:
|
|
try:
|
|
# See if execfunction will do the heavy lifting for us.
|
|
self.gc = execfunction.get_contents
|
|
except AttributeError:
|
|
# This is weird, just do the best we can.
|
|
self.funccontents = _object_contents(execfunction)
|
|
|
|
_ActionAction.__init__(self, **kw)
|
|
|
|
def function_name(self):
|
|
try:
|
|
return self.execfunction.__name__
|
|
except AttributeError:
|
|
try:
|
|
return self.execfunction.__class__.__name__
|
|
except AttributeError:
|
|
return "unknown_python_function"
|
|
|
|
def strfunction(self, target, source, env, executor=None):
|
|
if self.cmdstr is None:
|
|
return None
|
|
if self.cmdstr is not _null:
|
|
from SCons.Subst import SUBST_RAW
|
|
if executor:
|
|
c = env.subst(self.cmdstr, SUBST_RAW, executor=executor)
|
|
else:
|
|
c = env.subst(self.cmdstr, SUBST_RAW, target, source)
|
|
if c:
|
|
return c
|
|
|
|
def array(a):
|
|
def quote(s):
|
|
try:
|
|
str_for_display = s.str_for_display
|
|
except AttributeError:
|
|
s = repr(s)
|
|
else:
|
|
s = str_for_display()
|
|
return s
|
|
return '[' + ", ".join(map(quote, a)) + ']'
|
|
try:
|
|
strfunc = self.execfunction.strfunction
|
|
except AttributeError:
|
|
pass
|
|
else:
|
|
if strfunc is None:
|
|
return None
|
|
if callable(strfunc):
|
|
return strfunc(target, source, env)
|
|
name = self.function_name()
|
|
tstr = array(target)
|
|
sstr = array(source)
|
|
return "%s(%s, %s)" % (name, tstr, sstr)
|
|
|
|
def __str__(self):
|
|
name = self.function_name()
|
|
if name == 'ActionCaller':
|
|
return str(self.execfunction)
|
|
return "%s(target, source, env)" % name
|
|
|
|
def execute(self, target, source, env, executor=None):
|
|
exc_info = (None,None,None)
|
|
try:
|
|
if executor:
|
|
target = executor.get_all_targets()
|
|
source = executor.get_all_sources()
|
|
rsources = list(map(rfile, source))
|
|
try:
|
|
result = self.execfunction(target=target, source=rsources, env=env)
|
|
except KeyboardInterrupt as e:
|
|
raise
|
|
except SystemExit as e:
|
|
raise
|
|
except Exception as e:
|
|
result = e
|
|
exc_info = sys.exc_info()
|
|
|
|
if result:
|
|
result = SCons.Errors.convert_to_BuildError(result, exc_info)
|
|
result.node=target
|
|
result.action=self
|
|
try:
|
|
result.command=self.strfunction(target, source, env, executor)
|
|
except TypeError:
|
|
result.command=self.strfunction(target, source, env)
|
|
|
|
# FIXME: This maintains backward compatibility with respect to
|
|
# which type of exceptions were returned by raising an
|
|
# exception and which ones were returned by value. It would
|
|
# probably be best to always return them by value here, but
|
|
# some codes do not check the return value of Actions and I do
|
|
# not have the time to modify them at this point.
|
|
if (exc_info[1] and
|
|
not isinstance(exc_info[1],EnvironmentError)):
|
|
raise result
|
|
|
|
return result
|
|
finally:
|
|
# Break the cycle between the traceback object and this
|
|
# function stack frame. See the sys.exc_info() doc info for
|
|
# more information about this issue.
|
|
del exc_info
|
|
|
|
def get_presig(self, target, source, env):
|
|
"""Return the signature contents of this callable action."""
|
|
try:
|
|
return self.gc(target, source, env)
|
|
except AttributeError:
|
|
return self.funccontents
|
|
|
|
def get_implicit_deps(self, target, source, env):
|
|
return []
|
|
|
|
class ListAction(ActionBase):
|
|
"""Class for lists of other actions."""
|
|
def __init__(self, actionlist):
|
|
if SCons.Debug.track_instances: logInstanceCreation(self, 'Action.ListAction')
|
|
def list_of_actions(x):
|
|
if isinstance(x, ActionBase):
|
|
return x
|
|
return Action(x)
|
|
self.list = list(map(list_of_actions, actionlist))
|
|
# our children will have had any varlist
|
|
# applied; we don't need to do it again
|
|
self.varlist = ()
|
|
self.targets = '$TARGETS'
|
|
|
|
def genstring(self, target, source, env):
|
|
return '\n'.join([a.genstring(target, source, env) for a in self.list])
|
|
|
|
def __str__(self):
|
|
return '\n'.join(map(str, self.list))
|
|
|
|
def presub_lines(self, env):
|
|
return SCons.Util.flatten_sequence(
|
|
[a.presub_lines(env) for a in self.list])
|
|
|
|
def get_presig(self, target, source, env):
|
|
"""Return the signature contents of this action list.
|
|
|
|
Simple concatenation of the signatures of the elements.
|
|
"""
|
|
return b"".join([bytes(x.get_contents(target, source, env)) for x in self.list])
|
|
|
|
def __call__(self, target, source, env, exitstatfunc=_null, presub=_null,
|
|
show=_null, execute=_null, chdir=_null, executor=None):
|
|
if executor:
|
|
target = executor.get_all_targets()
|
|
source = executor.get_all_sources()
|
|
for act in self.list:
|
|
stat = act(target, source, env, exitstatfunc, presub,
|
|
show, execute, chdir, executor)
|
|
if stat:
|
|
return stat
|
|
return 0
|
|
|
|
def get_implicit_deps(self, target, source, env):
|
|
result = []
|
|
for act in self.list:
|
|
result.extend(act.get_implicit_deps(target, source, env))
|
|
return result
|
|
|
|
def get_varlist(self, target, source, env, executor=None):
|
|
result = OrderedDict()
|
|
for act in self.list:
|
|
for var in act.get_varlist(target, source, env, executor):
|
|
result[var] = True
|
|
return list(result.keys())
|
|
|
|
|
|
class ActionCaller:
|
|
"""A class for delaying calling an Action function with specific
|
|
(positional and keyword) arguments until the Action is actually
|
|
executed.
|
|
|
|
This class looks to the rest of the world like a normal Action object,
|
|
but what it's really doing is hanging on to the arguments until we
|
|
have a target, source and env to use for the expansion.
|
|
"""
|
|
def __init__(self, parent, args, kw):
|
|
self.parent = parent
|
|
self.args = args
|
|
self.kw = kw
|
|
|
|
def get_contents(self, target, source, env):
|
|
actfunc = self.parent.actfunc
|
|
try:
|
|
# "self.actfunc" is a function.
|
|
contents = actfunc.__code__.co_code
|
|
except AttributeError:
|
|
# "self.actfunc" is a callable object.
|
|
try:
|
|
contents = actfunc.__call__.__func__.__code__.co_code
|
|
except AttributeError:
|
|
# No __call__() method, so it might be a builtin
|
|
# or something like that. Do the best we can.
|
|
contents = repr(actfunc)
|
|
|
|
return contents
|
|
|
|
def subst(self, s, target, source, env):
|
|
# If s is a list, recursively apply subst()
|
|
# to every element in the list
|
|
if is_List(s):
|
|
result = []
|
|
for elem in s:
|
|
result.append(self.subst(elem, target, source, env))
|
|
return self.parent.convert(result)
|
|
|
|
# Special-case hack: Let a custom function wrapped in an
|
|
# ActionCaller get at the environment through which the action
|
|
# was called by using this hard-coded value as a special return.
|
|
if s == '$__env__':
|
|
return env
|
|
elif is_String(s):
|
|
return env.subst(s, 1, target, source)
|
|
return self.parent.convert(s)
|
|
|
|
def subst_args(self, target, source, env):
|
|
return [self.subst(x, target, source, env) for x in self.args]
|
|
|
|
def subst_kw(self, target, source, env):
|
|
kw = {}
|
|
for key in list(self.kw.keys()):
|
|
kw[key] = self.subst(self.kw[key], target, source, env)
|
|
return kw
|
|
|
|
def __call__(self, target, source, env, executor=None):
|
|
args = self.subst_args(target, source, env)
|
|
kw = self.subst_kw(target, source, env)
|
|
return self.parent.actfunc(*args, **kw)
|
|
|
|
def strfunction(self, target, source, env):
|
|
args = self.subst_args(target, source, env)
|
|
kw = self.subst_kw(target, source, env)
|
|
return self.parent.strfunc(*args, **kw)
|
|
|
|
def __str__(self):
|
|
return self.parent.strfunc(*self.args, **self.kw)
|
|
|
|
|
|
class ActionFactory:
|
|
"""A factory class that will wrap up an arbitrary function
|
|
as an SCons-executable Action object.
|
|
|
|
The real heavy lifting here is done by the ActionCaller class.
|
|
We just collect the (positional and keyword) arguments that we're
|
|
called with and give them to the ActionCaller object we create,
|
|
so it can hang onto them until it needs them.
|
|
"""
|
|
def __init__(self, actfunc, strfunc, convert=lambda x: x):
|
|
self.actfunc = actfunc
|
|
self.strfunc = strfunc
|
|
self.convert = convert
|
|
|
|
def __call__(self, *args, **kw):
|
|
ac = ActionCaller(self, args, kw)
|
|
action = Action(ac, strfunction=ac.strfunction)
|
|
return action
|
|
|
|
# Local Variables:
|
|
# tab-width:4
|
|
# indent-tabs-mode:nil
|
|
# End:
|
|
# vim: set expandtab tabstop=4 shiftwidth=4:
|