"""SCons.Environment Base class for construction Environments. These are the primary objects used to communicate dependency and construction information to the build engine. Keyword arguments supplied when the construction Environment is created are construction variables used to initialize the Environment """ # # __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__" import copy import os import sys import re import shlex from collections import UserDict import SCons.Action import SCons.Builder import SCons.Debug from SCons.Debug import logInstanceCreation import SCons.Defaults from SCons.Errors import UserError, BuildError import SCons.Memoize import SCons.Node import SCons.Node.Alias import SCons.Node.FS import SCons.Node.Python import SCons.Platform import SCons.SConf import SCons.SConsign import SCons.Subst import SCons.Tool import SCons.Util import SCons.Warnings class _Null(object): pass _null = _Null _warn_copy_deprecated = True _warn_source_signatures_deprecated = True _warn_target_signatures_deprecated = True CleanTargets = {} CalculatorArgs = {} semi_deepcopy = SCons.Util.semi_deepcopy semi_deepcopy_dict = SCons.Util.semi_deepcopy_dict def alias_builder(env, target, source): pass AliasBuilder = SCons.Builder.Builder(action = alias_builder, target_factory = SCons.Node.Alias.default_ans.Alias, source_factory = SCons.Node.FS.Entry, multi = 1, is_explicit = None, name='AliasBuilder') def apply_tools(env, tools, toolpath): # Store the toolpath in the Environment. if toolpath is not None: env['toolpath'] = toolpath if not tools: return # Filter out null tools from the list. for tool in [_f for _f in tools if _f]: if SCons.Util.is_List(tool) or isinstance(tool, tuple): toolname = tool[0] toolargs = tool[1] # should be a dict of kw args tool = env.Tool(toolname, **toolargs) else: env.Tool(tool) # These names are (or will be) controlled by SCons; users should never # set or override them. This warning can optionally be turned off, # but scons will still ignore the illegal variable names even if it's off. reserved_construction_var_names = [ 'CHANGED_SOURCES', 'CHANGED_TARGETS', 'SOURCE', 'SOURCES', 'TARGET', 'TARGETS', 'UNCHANGED_SOURCES', 'UNCHANGED_TARGETS', ] future_reserved_construction_var_names = [ #'HOST_OS', #'HOST_ARCH', #'HOST_CPU', ] def copy_non_reserved_keywords(dict): result = semi_deepcopy(dict) for k in list(result.keys()): if k in reserved_construction_var_names: msg = "Ignoring attempt to set reserved variable `$%s'" SCons.Warnings.warn(SCons.Warnings.ReservedVariableWarning, msg % k) del result[k] return result def _set_reserved(env, key, value): msg = "Ignoring attempt to set reserved variable `$%s'" SCons.Warnings.warn(SCons.Warnings.ReservedVariableWarning, msg % key) def _set_future_reserved(env, key, value): env._dict[key] = value msg = "`$%s' will be reserved in a future release and setting it will become ignored" SCons.Warnings.warn(SCons.Warnings.FutureReservedVariableWarning, msg % key) def _set_BUILDERS(env, key, value): try: bd = env._dict[key] for k in list(bd.keys()): del bd[k] except KeyError: bd = BuilderDict(bd, env) env._dict[key] = bd for k, v in value.items(): if not SCons.Builder.is_a_Builder(v): raise UserError('%s is not a Builder.' % repr(v)) bd.update(value) def _del_SCANNERS(env, key): del env._dict[key] env.scanner_map_delete() def _set_SCANNERS(env, key, value): env._dict[key] = value env.scanner_map_delete() def _delete_duplicates(l, keep_last): """Delete duplicates from a sequence, keeping the first or last.""" seen=set() result=[] if keep_last: # reverse in & out, then keep first l.reverse() for i in l: try: if i not in seen: result.append(i) seen.add(i) except TypeError: # probably unhashable. Just keep it. result.append(i) if keep_last: result.reverse() return result # The following is partly based on code in a comment added by Peter # Shannon at the following page (there called the "transplant" class): # # ASPN : Python Cookbook : Dynamically added methods to a class # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/81732 # # We had independently been using the idiom as BuilderWrapper, but # factoring out the common parts into this base class, and making # BuilderWrapper a subclass that overrides __call__() to enforce specific # Builder calling conventions, simplified some of our higher-layer code. class MethodWrapper(object): """ A generic Wrapper class that associates a method (which can actually be any callable) with an object. As part of creating this MethodWrapper object an attribute with the specified (by default, the name of the supplied method) is added to the underlying object. When that new "method" is called, our __call__() method adds the object as the first argument, simulating the Python behavior of supplying "self" on method calls. We hang on to the name by which the method was added to the underlying base class so that we can provide a method to "clone" ourselves onto a new underlying object being copied (without which we wouldn't need to save that info). """ def __init__(self, object, method, name=None): if name is None: name = method.__name__ self.object = object self.method = method self.name = name setattr(self.object, name, self) def __call__(self, *args, **kwargs): nargs = (self.object,) + args return self.method(*nargs, **kwargs) def clone(self, new_object): """ Returns an object that re-binds the underlying "method" to the specified new object. """ return self.__class__(new_object, self.method, self.name) class BuilderWrapper(MethodWrapper): """ A MethodWrapper subclass that that associates an environment with a Builder. This mainly exists to wrap the __call__() function so that all calls to Builders can have their argument lists massaged in the same way (treat a lone argument as the source, treat two arguments as target then source, make sure both target and source are lists) without having to have cut-and-paste code to do it. As a bit of obsessive backwards compatibility, we also intercept attempts to get or set the "env" or "builder" attributes, which were the names we used before we put the common functionality into the MethodWrapper base class. We'll keep this around for a while in case people shipped Tool modules that reached into the wrapper (like the Tool/qt.py module does, or did). There shouldn't be a lot attribute fetching or setting on these, so a little extra work shouldn't hurt. """ def __call__(self, target=None, source=_null, *args, **kw): if source is _null: source = target target = None if target is not None and not SCons.Util.is_List(target): target = [target] if source is not None and not SCons.Util.is_List(source): source = [source] return MethodWrapper.__call__(self, target, source, *args, **kw) def __repr__(self): return '' % repr(self.name) def __str__(self): return self.__repr__() def __getattr__(self, name): if name == 'env': return self.object elif name == 'builder': return self.method else: raise AttributeError(name) def __setattr__(self, name, value): if name == 'env': self.object = value elif name == 'builder': self.method = value else: self.__dict__[name] = value # This allows a Builder to be executed directly # through the Environment to which it's attached. # In practice, we shouldn't need this, because # builders actually get executed through a Node. # But we do have a unit test for this, and can't # yet rule out that it would be useful in the # future, so leave it for now. #def execute(self, **kw): # kw['env'] = self.env # self.builder.execute(**kw) class BuilderDict(UserDict): """This is a dictionary-like class used by an Environment to hold the Builders. We need to do this because every time someone changes the Builders in the Environment's BUILDERS dictionary, we must update the Environment's attributes.""" def __init__(self, dict, env): # Set self.env before calling the superclass initialization, # because it will end up calling our other methods, which will # need to point the values in this dictionary to self.env. self.env = env UserDict.__init__(self, dict) def __semi_deepcopy__(self): # These cannot be copied since they would both modify the same builder object, and indeed # just copying would modify the original builder raise TypeError( 'cannot semi_deepcopy a BuilderDict' ) def __setitem__(self, item, val): try: method = getattr(self.env, item).method except AttributeError: pass else: self.env.RemoveMethod(method) UserDict.__setitem__(self, item, val) BuilderWrapper(self.env, val, item) def __delitem__(self, item): UserDict.__delitem__(self, item) delattr(self.env, item) def update(self, dict): for i, v in dict.items(): self.__setitem__(i, v) _is_valid_var = re.compile(r'[_a-zA-Z]\w*$') def is_valid_construction_var(varstr): """Return if the specified string is a legitimate construction variable. """ return _is_valid_var.match(varstr) class SubstitutionEnvironment(object): """Base class for different flavors of construction environments. This class contains a minimal set of methods that handle construction variable expansion and conversion of strings to Nodes, which may or may not be actually useful as a stand-alone class. Which methods ended up in this class is pretty arbitrary right now. They're basically the ones which we've empirically determined are common to the different construction environment subclasses, and most of the others that use or touch the underlying dictionary of construction variables. Eventually, this class should contain all the methods that we determine are necessary for a "minimal" interface to the build engine. A full "native Python" SCons environment has gotten pretty heavyweight with all of the methods and Tools and construction variables we've jammed in there, so it would be nice to have a lighter weight alternative for interfaces that don't need all of the bells and whistles. (At some point, we'll also probably rename this class "Base," since that more reflects what we want this class to become, but because we've released comments that tell people to subclass Environment.Base to create their own flavors of construction environment, we'll save that for a future refactoring when this class actually becomes useful.) """ def __init__(self, **kw): """Initialization of an underlying SubstitutionEnvironment class. """ if SCons.Debug.track_instances: logInstanceCreation(self, 'Environment.SubstitutionEnvironment') self.fs = SCons.Node.FS.get_default_fs() self.ans = SCons.Node.Alias.default_ans self.lookup_list = SCons.Node.arg2nodes_lookups self._dict = kw.copy() self._init_special() self.added_methods = [] #self._memo = {} def _init_special(self): """Initial the dispatch tables for special handling of special construction variables.""" self._special_del = {} self._special_del['SCANNERS'] = _del_SCANNERS self._special_set = {} for key in reserved_construction_var_names: self._special_set[key] = _set_reserved for key in future_reserved_construction_var_names: self._special_set[key] = _set_future_reserved self._special_set['BUILDERS'] = _set_BUILDERS self._special_set['SCANNERS'] = _set_SCANNERS # Freeze the keys of self._special_set in a list for use by # methods that need to check. (Empirically, list scanning has # gotten better than dict.has_key() in Python 2.5.) self._special_set_keys = list(self._special_set.keys()) def __eq__(self, other): return self._dict == other._dict def __delitem__(self, key): special = self._special_del.get(key) if special: special(self, key) else: del self._dict[key] def __getitem__(self, key): return self._dict[key] def __setitem__(self, key, value): # This is heavily used. This implementation is the best we have # according to the timings in bench/env.__setitem__.py. # # The "key in self._special_set_keys" test here seems to perform # pretty well for the number of keys we have. A hard-coded # list works a little better in Python 2.5, but that has the # disadvantage of maybe getting out of sync if we ever add more # variable names. Using self._special_set.has_key() works a # little better in Python 2.4, but is worse than this test. # So right now it seems like a good trade-off, but feel free to # revisit this with bench/env.__setitem__.py as needed (and # as newer versions of Python come out). if key in self._special_set_keys: self._special_set[key](self, key, value) else: # If we already have the entry, then it's obviously a valid # key and we don't need to check. If we do check, using a # global, pre-compiled regular expression directly is more # efficient than calling another function or a method. if key not in self._dict \ and not _is_valid_var.match(key): raise UserError("Illegal construction variable `%s'" % key) self._dict[key] = value def get(self, key, default=None): """Emulates the get() method of dictionaries.""" return self._dict.get(key, default) def has_key(self, key): return key in self._dict def __contains__(self, key): return self._dict.__contains__(key) def items(self): return list(self._dict.items()) def arg2nodes(self, args, node_factory=_null, lookup_list=_null, **kw): if node_factory is _null: node_factory = self.fs.File if lookup_list is _null: lookup_list = self.lookup_list if not args: return [] args = SCons.Util.flatten(args) nodes = [] for v in args: if SCons.Util.is_String(v): n = None for l in lookup_list: n = l(v) if n is not None: break if n is not None: if SCons.Util.is_String(n): # n = self.subst(n, raw=1, **kw) kw['raw'] = 1 n = self.subst(n, **kw) if node_factory: n = node_factory(n) if SCons.Util.is_List(n): nodes.extend(n) else: nodes.append(n) elif node_factory: # v = node_factory(self.subst(v, raw=1, **kw)) kw['raw'] = 1 v = node_factory(self.subst(v, **kw)) if SCons.Util.is_List(v): nodes.extend(v) else: nodes.append(v) else: nodes.append(v) return nodes def gvars(self): return self._dict def lvars(self): return {} def subst(self, string, raw=0, target=None, source=None, conv=None, executor=None): """Recursively interpolates construction variables from the Environment into the specified string, returning the expanded result. Construction variables are specified by a $ prefix in the string and begin with an initial underscore or alphabetic character followed by any number of underscores or alphanumeric characters. The construction variable names may be surrounded by curly braces to separate the name from trailing characters. """ gvars = self.gvars() lvars = self.lvars() lvars['__env__'] = self if executor: lvars.update(executor.get_lvars()) return SCons.Subst.scons_subst(string, self, raw, target, source, gvars, lvars, conv) def subst_kw(self, kw, raw=0, target=None, source=None): nkw = {} for k, v in kw.items(): k = self.subst(k, raw, target, source) if SCons.Util.is_String(v): v = self.subst(v, raw, target, source) nkw[k] = v return nkw def subst_list(self, string, raw=0, target=None, source=None, conv=None, executor=None): """Calls through to SCons.Subst.scons_subst_list(). See the documentation for that function.""" gvars = self.gvars() lvars = self.lvars() lvars['__env__'] = self if executor: lvars.update(executor.get_lvars()) return SCons.Subst.scons_subst_list(string, self, raw, target, source, gvars, lvars, conv) def subst_path(self, path, target=None, source=None): """Substitute a path list, turning EntryProxies into Nodes and leaving Nodes (and other objects) as-is.""" if not SCons.Util.is_List(path): path = [path] def s(obj): """This is the "string conversion" routine that we have our substitutions use to return Nodes, not strings. This relies on the fact that an EntryProxy object has a get() method that returns the underlying Node that it wraps, which is a bit of architectural dependence that we might need to break or modify in the future in response to additional requirements.""" try: get = obj.get except AttributeError: obj = SCons.Util.to_String_for_subst(obj) else: obj = get() return obj r = [] for p in path: if SCons.Util.is_String(p): p = self.subst(p, target=target, source=source, conv=s) if SCons.Util.is_List(p): if len(p) == 1: p = p[0] else: # We have an object plus a string, or multiple # objects that we need to smush together. No choice # but to make them into a string. p = ''.join(map(SCons.Util.to_String_for_subst, p)) else: p = s(p) r.append(p) return r subst_target_source = subst def backtick(self, command): import subprocess # common arguments kw = { 'stdin' : 'devnull', 'stdout' : subprocess.PIPE, 'stderr' : subprocess.PIPE, 'universal_newlines' : True, } # if the command is a list, assume it's been quoted # othewise force a shell if not SCons.Util.is_List(command): kw['shell'] = True # run constructed command p = SCons.Action._subproc(self, command, **kw) out,err = p.communicate() status = p.wait() if err: sys.stderr.write("" + err) if status: raise OSError("'%s' exited %d" % (command, status)) return out def AddMethod(self, function, name=None): """ Adds the specified function as a method of this construction environment with the specified name. If the name is omitted, the default name is the name of the function itself. """ method = MethodWrapper(self, function, name) self.added_methods.append(method) def RemoveMethod(self, function): """ Removes the specified function's MethodWrapper from the added_methods list, so we don't re-bind it when making a clone. """ self.added_methods = [dm for dm in self.added_methods if dm.method is not function] def Override(self, overrides): """ Produce a modified environment whose variables are overridden by the overrides dictionaries. "overrides" is a dictionary that will override the variables of this environment. This function is much more efficient than Clone() or creating a new Environment because it doesn't copy the construction environment dictionary, it just wraps the underlying construction environment, and doesn't even create a wrapper object if there are no overrides. """ if not overrides: return self o = copy_non_reserved_keywords(overrides) if not o: return self overrides = {} merges = None for key, value in o.items(): if key == 'parse_flags': merges = value else: overrides[key] = SCons.Subst.scons_subst_once(value, self, key) env = OverrideEnvironment(self, overrides) if merges: env.MergeFlags(merges) return env def ParseFlags(self, *flags): """ Parse the set of flags and return a dict with the flags placed in the appropriate entry. The flags are treated as a typical set of command-line flags for a GNU-like toolchain and used to populate the entries in the dict immediately below. If one of the flag strings begins with a bang (exclamation mark), it is assumed to be a command and the rest of the string is executed; the result of that evaluation is then added to the dict. """ dict = { 'ASFLAGS' : SCons.Util.CLVar(''), 'CFLAGS' : SCons.Util.CLVar(''), 'CCFLAGS' : SCons.Util.CLVar(''), 'CXXFLAGS' : SCons.Util.CLVar(''), 'CPPDEFINES' : [], 'CPPFLAGS' : SCons.Util.CLVar(''), 'CPPPATH' : [], 'FRAMEWORKPATH' : SCons.Util.CLVar(''), 'FRAMEWORKS' : SCons.Util.CLVar(''), 'LIBPATH' : [], 'LIBS' : [], 'LINKFLAGS' : SCons.Util.CLVar(''), 'RPATH' : [], } def do_parse(arg): # if arg is a sequence, recurse with each element if not arg: return if not SCons.Util.is_String(arg): for t in arg: do_parse(t) return # if arg is a command, execute it if arg[0] == '!': arg = self.backtick(arg[1:]) # utility function to deal with -D option def append_define(name, dict = dict): t = name.split('=') if len(t) == 1: dict['CPPDEFINES'].append(name) else: dict['CPPDEFINES'].append([t[0], '='.join(t[1:])]) # Loop through the flags and add them to the appropriate option. # This tries to strike a balance between checking for all possible # flags and keeping the logic to a finite size, so it doesn't # check for some that don't occur often. It particular, if the # flag is not known to occur in a config script and there's a way # of passing the flag to the right place (by wrapping it in a -W # flag, for example) we don't check for it. Note that most # preprocessor options are not handled, since unhandled options # are placed in CCFLAGS, so unless the preprocessor is invoked # separately, these flags will still get to the preprocessor. # Other options not currently handled: # -iqoutedir (preprocessor search path) # -u symbol (linker undefined symbol) # -s (linker strip files) # -static* (linker static binding) # -shared* (linker dynamic binding) # -symbolic (linker global binding) # -R dir (deprecated linker rpath) # IBM compilers may also accept -qframeworkdir=foo params = shlex.split(arg) append_next_arg_to = None # for multi-word args for arg in params: if append_next_arg_to: if append_next_arg_to == 'CPPDEFINES': append_define(arg) elif append_next_arg_to == '-include': t = ('-include', self.fs.File(arg)) dict['CCFLAGS'].append(t) elif append_next_arg_to == '-imacros': t = ('-imacros', self.fs.File(arg)) dict['CCFLAGS'].append(t) elif append_next_arg_to == '-isysroot': t = ('-isysroot', arg) dict['CCFLAGS'].append(t) dict['LINKFLAGS'].append(t) elif append_next_arg_to == '-isystem': t = ('-isystem', arg) dict['CCFLAGS'].append(t) elif append_next_arg_to == '-iquote': t = ('-iquote', arg) dict['CCFLAGS'].append(t) elif append_next_arg_to == '-idirafter': t = ('-idirafter', arg) dict['CCFLAGS'].append(t) elif append_next_arg_to == '-arch': t = ('-arch', arg) dict['CCFLAGS'].append(t) dict['LINKFLAGS'].append(t) else: dict[append_next_arg_to].append(arg) append_next_arg_to = None elif not arg[0] in ['-', '+']: dict['LIBS'].append(self.fs.File(arg)) elif arg == '-dylib_file': dict['LINKFLAGS'].append(arg) append_next_arg_to = 'LINKFLAGS' elif arg[:2] == '-L': if arg[2:]: dict['LIBPATH'].append(arg[2:]) else: append_next_arg_to = 'LIBPATH' elif arg[:2] == '-l': if arg[2:]: dict['LIBS'].append(arg[2:]) else: append_next_arg_to = 'LIBS' elif arg[:2] == '-I': if arg[2:]: dict['CPPPATH'].append(arg[2:]) else: append_next_arg_to = 'CPPPATH' elif arg[:4] == '-Wa,': dict['ASFLAGS'].append(arg[4:]) dict['CCFLAGS'].append(arg) elif arg[:4] == '-Wl,': if arg[:11] == '-Wl,-rpath=': dict['RPATH'].append(arg[11:]) elif arg[:7] == '-Wl,-R,': dict['RPATH'].append(arg[7:]) elif arg[:6] == '-Wl,-R': dict['RPATH'].append(arg[6:]) else: dict['LINKFLAGS'].append(arg) elif arg[:4] == '-Wp,': dict['CPPFLAGS'].append(arg) elif arg[:2] == '-D': if arg[2:]: append_define(arg[2:]) else: append_next_arg_to = 'CPPDEFINES' elif arg == '-framework': append_next_arg_to = 'FRAMEWORKS' elif arg[:14] == '-frameworkdir=': dict['FRAMEWORKPATH'].append(arg[14:]) elif arg[:2] == '-F': if arg[2:]: dict['FRAMEWORKPATH'].append(arg[2:]) else: append_next_arg_to = 'FRAMEWORKPATH' elif arg in ['-mno-cygwin', '-pthread', '-openmp', '-fmerge-all-constants', '-fopenmp']: dict['CCFLAGS'].append(arg) dict['LINKFLAGS'].append(arg) elif arg == '-mwindows': dict['LINKFLAGS'].append(arg) elif arg[:5] == '-std=': if '++' in arg[5:]: key='CXXFLAGS' else: key='CFLAGS' dict[key].append(arg) elif arg[0] == '+': dict['CCFLAGS'].append(arg) dict['LINKFLAGS'].append(arg) elif arg in ['-include', '-imacros', '-isysroot', '-isystem', '-iquote', '-idirafter', '-arch']: append_next_arg_to = arg else: dict['CCFLAGS'].append(arg) for arg in flags: do_parse(arg) return dict def MergeFlags(self, args, unique=1, dict=None): """ Merge the dict in args into the construction variables of this env, or the passed-in dict. If args is not a dict, it is converted into a dict using ParseFlags. If unique is not set, the flags are appended rather than merged. """ if dict is None: dict = self if not SCons.Util.is_Dict(args): args = self.ParseFlags(args) if not unique: self.Append(**args) return self for key, value in args.items(): if not value: continue try: orig = self[key] except KeyError: orig = value else: if not orig: orig = value elif value: # Add orig and value. The logic here was lifted from # part of env.Append() (see there for a lot of comments # about the order in which things are tried) and is # used mainly to handle coercion of strings to CLVar to # "do the right thing" given (e.g.) an original CCFLAGS # string variable like '-pipe -Wall'. try: orig = orig + value except (KeyError, TypeError): try: add_to_orig = orig.append except AttributeError: value.insert(0, orig) orig = value else: add_to_orig(value) t = [] if key[-4:] == 'PATH': ### keep left-most occurence for v in orig: if v not in t: t.append(v) else: ### keep right-most occurence orig.reverse() for v in orig: if v not in t: t.insert(0, v) self[key] = t return self def default_decide_source(dependency, target, prev_ni, repo_node=None): f = SCons.Defaults.DefaultEnvironment().decide_source return f(dependency, target, prev_ni, repo_node) def default_decide_target(dependency, target, prev_ni, repo_node=None): f = SCons.Defaults.DefaultEnvironment().decide_target return f(dependency, target, prev_ni, repo_node) def default_copy_from_cache(src, dst): f = SCons.Defaults.DefaultEnvironment().copy_from_cache return f(src, dst) class Base(SubstitutionEnvironment): """Base class for "real" construction Environments. These are the primary objects used to communicate dependency and construction information to the build engine. Keyword arguments supplied when the construction Environment is created are construction variables used to initialize the Environment. """ ####################################################################### # This is THE class for interacting with the SCons build engine, # and it contains a lot of stuff, so we're going to try to keep this # a little organized by grouping the methods. ####################################################################### ####################################################################### # Methods that make an Environment act like a dictionary. These have # the expected standard names for Python mapping objects. Note that # we don't actually make an Environment a subclass of UserDict for # performance reasons. Note also that we only supply methods for # dictionary functionality that we actually need and use. ####################################################################### def __init__(self, platform=None, tools=None, toolpath=None, variables=None, parse_flags = None, **kw): """ Initialization of a basic SCons construction environment, including setting up special construction variables like BUILDER, PLATFORM, etc., and searching for and applying available Tools. Note that we do *not* call the underlying base class (SubsitutionEnvironment) initialization, because we need to initialize things in a very specific order that doesn't work with the much simpler base class initialization. """ if SCons.Debug.track_instances: logInstanceCreation(self, 'Environment.Base') self._memo = {} self.fs = SCons.Node.FS.get_default_fs() self.ans = SCons.Node.Alias.default_ans self.lookup_list = SCons.Node.arg2nodes_lookups self._dict = semi_deepcopy(SCons.Defaults.ConstructionEnvironment) self._init_special() self.added_methods = [] # We don't use AddMethod, or define these as methods in this # class, because we *don't* want these functions to be bound # methods. They need to operate independently so that the # settings will work properly regardless of whether a given # target ends up being built with a Base environment or an # OverrideEnvironment or what have you. self.decide_target = default_decide_target self.decide_source = default_decide_source self.copy_from_cache = default_copy_from_cache self._dict['BUILDERS'] = BuilderDict(self._dict['BUILDERS'], self) if platform is None: platform = self._dict.get('PLATFORM', None) if platform is None: platform = SCons.Platform.Platform() if SCons.Util.is_String(platform): platform = SCons.Platform.Platform(platform) self._dict['PLATFORM'] = str(platform) platform(self) self._dict['HOST_OS'] = self._dict.get('HOST_OS',None) self._dict['HOST_ARCH'] = self._dict.get('HOST_ARCH',None) # Now set defaults for TARGET_{OS|ARCH} self._dict['TARGET_OS'] = self._dict.get('TARGET_OS',None) self._dict['TARGET_ARCH'] = self._dict.get('TARGET_ARCH',None) # Apply the passed-in and customizable variables to the # environment before calling the tools, because they may use # some of them during initialization. if 'options' in kw: # Backwards compatibility: they may stll be using the # old "options" keyword. variables = kw['options'] del kw['options'] self.Replace(**kw) keys = list(kw.keys()) if variables: keys = keys + list(variables.keys()) variables.Update(self) save = {} for k in keys: try: save[k] = self._dict[k] except KeyError: # No value may have been set if they tried to pass in a # reserved variable name like TARGETS. pass SCons.Tool.Initializers(self) if tools is None: tools = self._dict.get('TOOLS', None) if tools is None: tools = ['default'] apply_tools(self, tools, toolpath) # Now restore the passed-in and customized variables # to the environment, since the values the user set explicitly # should override any values set by the tools. for key, val in save.items(): self._dict[key] = val # Finally, apply any flags to be merged in if parse_flags: self.MergeFlags(parse_flags) ####################################################################### # Utility methods that are primarily for internal use by SCons. # These begin with lower-case letters. ####################################################################### def get_builder(self, name): """Fetch the builder with the specified name from the environment. """ try: return self._dict['BUILDERS'][name] except KeyError: return None def get_CacheDir(self): try: path = self._CacheDir_path except AttributeError: path = SCons.Defaults.DefaultEnvironment()._CacheDir_path try: if path == self._last_CacheDir_path: return self._last_CacheDir except AttributeError: pass cd = SCons.CacheDir.CacheDir(path) self._last_CacheDir_path = path self._last_CacheDir = cd return cd def get_factory(self, factory, default='File'): """Return a factory function for creating Nodes for this construction environment. """ name = default try: is_node = issubclass(factory, SCons.Node.FS.Base) except TypeError: # The specified factory isn't a Node itself--it's # most likely None, or possibly a callable. pass else: if is_node: # The specified factory is a Node (sub)class. Try to # return the FS method that corresponds to the Node's # name--that is, we return self.fs.Dir if they want a Dir, # self.fs.File for a File, etc. try: name = factory.__name__ except AttributeError: pass else: factory = None if not factory: # They passed us None, or we picked up a name from a specified # class, so return the FS method. (Note that we *don't* # use our own self.{Dir,File} methods because that would # cause env.subst() to be called twice on the file name, # interfering with files that have $$ in them.) factory = getattr(self.fs, name) return factory @SCons.Memoize.CountMethodCall def _gsm(self): try: return self._memo['_gsm'] except KeyError: pass result = {} try: scanners = self._dict['SCANNERS'] except KeyError: pass else: # Reverse the scanner list so that, if multiple scanners # claim they can scan the same suffix, earlier scanners # in the list will overwrite later scanners, so that # the result looks like a "first match" to the user. if not SCons.Util.is_List(scanners): scanners = [scanners] else: scanners = scanners[:] # copy so reverse() doesn't mod original scanners.reverse() for scanner in scanners: for k in scanner.get_skeys(self): if k and self['PLATFORM'] == 'win32': k = k.lower() result[k] = scanner self._memo['_gsm'] = result return result def get_scanner(self, skey): """Find the appropriate scanner given a key (usually a file suffix). """ if skey and self['PLATFORM'] == 'win32': skey = skey.lower() return self._gsm().get(skey) def scanner_map_delete(self, kw=None): """Delete the cached scanner map (if we need to). """ try: del self._memo['_gsm'] except KeyError: pass def _update(self, dict): """Update an environment's values directly, bypassing the normal checks that occur when users try to set items. """ self._dict.update(dict) def get_src_sig_type(self): try: return self.src_sig_type except AttributeError: t = SCons.Defaults.DefaultEnvironment().src_sig_type self.src_sig_type = t return t def get_tgt_sig_type(self): try: return self.tgt_sig_type except AttributeError: t = SCons.Defaults.DefaultEnvironment().tgt_sig_type self.tgt_sig_type = t return t ####################################################################### # Public methods for manipulating an Environment. These begin with # upper-case letters. The essential characteristic of methods in # this section is that they do *not* have corresponding same-named # global functions. For example, a stand-alone Append() function # makes no sense, because Append() is all about appending values to # an Environment's construction variables. ####################################################################### def Append(self, **kw): """Append values to existing construction variables in an Environment. """ kw = copy_non_reserved_keywords(kw) for key, val in kw.items(): # It would be easier on the eyes to write this using # "continue" statements whenever we finish processing an item, # but Python 1.5.2 apparently doesn't let you use "continue" # within try:-except: blocks, so we have to nest our code. try: if key == 'CPPDEFINES' and SCons.Util.is_String(self._dict[key]): self._dict[key] = [self._dict[key]] orig = self._dict[key] except KeyError: # No existing variable in the environment, so just set # it to the new value. if key == 'CPPDEFINES' and SCons.Util.is_String(val): self._dict[key] = [val] else: self._dict[key] = val else: try: # Check if the original looks like a dictionary. # If it is, we can't just try adding the value because # dictionaries don't have __add__() methods, and # things like UserList will incorrectly coerce the # original dict to a list (which we don't want). update_dict = orig.update except AttributeError: try: # Most straightforward: just try to add them # together. This will work in most cases, when the # original and new values are of compatible types. self._dict[key] = orig + val except (KeyError, TypeError): try: # Check if the original is a list. add_to_orig = orig.append except AttributeError: # The original isn't a list, but the new # value is (by process of elimination), # so insert the original in the new value # (if there's one to insert) and replace # the variable with it. if orig: val.insert(0, orig) self._dict[key] = val else: # The original is a list, so append the new # value to it (if there's a value to append). if val: add_to_orig(val) else: # The original looks like a dictionary, so update it # based on what we think the value looks like. if SCons.Util.is_List(val): if key == 'CPPDEFINES': tmp = [] for (k, v) in orig.items(): if v is not None: tmp.append((k, v)) else: tmp.append((k,)) orig = tmp orig += val self._dict[key] = orig else: for v in val: orig[v] = None else: try: update_dict(val) except (AttributeError, TypeError, ValueError): if SCons.Util.is_Dict(val): for k, v in val.items(): orig[k] = v else: orig[val] = None self.scanner_map_delete(kw) # allow Dirs and strings beginning with # for top-relative # Note this uses the current env's fs (in self). def _canonicalize(self, path): if not SCons.Util.is_String(path): # typically a Dir path = str(path) if path and path[0] == '#': path = str(self.fs.Dir(path)) return path def AppendENVPath(self, name, newpath, envname = 'ENV', sep = os.pathsep, delete_existing=0): """Append path elements to the path 'name' in the 'ENV' dictionary for this environment. Will only add any particular path once, and will normpath and normcase all paths to help assure this. This can also handle the case where the env variable is a list instead of a string. If delete_existing is 0, a newpath which is already in the path will not be moved to the end (it will be left where it is). """ orig = '' if envname in self._dict and name in self._dict[envname]: orig = self._dict[envname][name] nv = SCons.Util.AppendPath(orig, newpath, sep, delete_existing, canonicalize=self._canonicalize) if envname not in self._dict: self._dict[envname] = {} self._dict[envname][name] = nv def AppendUnique(self, delete_existing=0, **kw): """Append values to existing construction variables in an Environment, if they're not already there. If delete_existing is 1, removes existing values first, so values move to end. """ kw = copy_non_reserved_keywords(kw) for key, val in kw.items(): if SCons.Util.is_List(val): val = _delete_duplicates(val, delete_existing) if key not in self._dict or self._dict[key] in ('', None): self._dict[key] = val elif SCons.Util.is_Dict(self._dict[key]) and \ SCons.Util.is_Dict(val): self._dict[key].update(val) elif SCons.Util.is_List(val): dk = self._dict[key] if key == 'CPPDEFINES': tmp = [] for i in val: if SCons.Util.is_List(i): if len(i) >= 2: tmp.append((i[0], i[1])) else: tmp.append((i[0],)) elif SCons.Util.is_Tuple(i): tmp.append(i) else: tmp.append((i,)) val = tmp # Construct a list of (key, value) tuples. if SCons.Util.is_Dict(dk): tmp = [] for (k, v) in dk.items(): if v is not None: tmp.append((k, v)) else: tmp.append((k,)) dk = tmp elif SCons.Util.is_String(dk): dk = [(dk,)] else: tmp = [] for i in dk: if SCons.Util.is_List(i): if len(i) >= 2: tmp.append((i[0], i[1])) else: tmp.append((i[0],)) elif SCons.Util.is_Tuple(i): tmp.append(i) else: tmp.append((i,)) dk = tmp else: if not SCons.Util.is_List(dk): dk = [dk] if delete_existing: dk = [x for x in dk if x not in val] else: val = [x for x in val if x not in dk] self._dict[key] = dk + val else: dk = self._dict[key] if SCons.Util.is_List(dk): if key == 'CPPDEFINES': tmp = [] for i in dk: if SCons.Util.is_List(i): if len(i) >= 2: tmp.append((i[0], i[1])) else: tmp.append((i[0],)) elif SCons.Util.is_Tuple(i): tmp.append(i) else: tmp.append((i,)) dk = tmp # Construct a list of (key, value) tuples. if SCons.Util.is_Dict(val): tmp = [] for (k, v) in val.items(): if v is not None: tmp.append((k, v)) else: tmp.append((k,)) val = tmp elif SCons.Util.is_String(val): val = [(val,)] if delete_existing: dk = list(filter(lambda x, val=val: x not in val, dk)) self._dict[key] = dk + val else: dk = [x for x in dk if x not in val] self._dict[key] = dk + val else: # By elimination, val is not a list. Since dk is a # list, wrap val in a list first. if delete_existing: dk = list(filter(lambda x, val=val: x not in val, dk)) self._dict[key] = dk + [val] else: if val not in dk: self._dict[key] = dk + [val] else: if key == 'CPPDEFINES': if SCons.Util.is_String(dk): dk = [dk] elif SCons.Util.is_Dict(dk): tmp = [] for (k, v) in dk.items(): if v is not None: tmp.append((k, v)) else: tmp.append((k,)) dk = tmp if SCons.Util.is_String(val): if val in dk: val = [] else: val = [val] elif SCons.Util.is_Dict(val): tmp = [] for i,j in val.items(): if j is not None: tmp.append((i,j)) else: tmp.append(i) val = tmp if delete_existing: dk = [x for x in dk if x not in val] self._dict[key] = dk + val self.scanner_map_delete(kw) def Clone(self, tools=[], toolpath=None, parse_flags = None, **kw): """Return a copy of a construction Environment. The copy is like a Python "deep copy"--that is, independent copies are made recursively of each objects--except that a reference is copied when an object is not deep-copyable (like a function). There are no references to any mutable objects in the original Environment. """ builders = self._dict.get('BUILDERS', {}) clone = copy.copy(self) # BUILDERS is not safe to do a simple copy clone._dict = semi_deepcopy_dict(self._dict, ['BUILDERS']) clone._dict['BUILDERS'] = BuilderDict(builders, clone) # Check the methods added via AddMethod() and re-bind them to # the cloned environment. Only do this if the attribute hasn't # been overwritten by the user explicitly and still points to # the added method. clone.added_methods = [] for mw in self.added_methods: if mw == getattr(self, mw.name): clone.added_methods.append(mw.clone(clone)) clone._memo = {} # Apply passed-in variables before the tools # so the tools can use the new variables kw = copy_non_reserved_keywords(kw) new = {} for key, value in kw.items(): new[key] = SCons.Subst.scons_subst_once(value, self, key) clone.Replace(**new) apply_tools(clone, tools, toolpath) # apply them again in case the tools overwrote them clone.Replace(**new) # Finally, apply any flags to be merged in if parse_flags: clone.MergeFlags(parse_flags) if SCons.Debug.track_instances: logInstanceCreation(self, 'Environment.EnvironmentClone') return clone def _changed_build(self, dependency, target, prev_ni, repo_node=None): if dependency.changed_state(target, prev_ni, repo_node): return 1 return self.decide_source(dependency, target, prev_ni, repo_node) def _changed_content(self, dependency, target, prev_ni, repo_node=None): return dependency.changed_content(target, prev_ni, repo_node) def _changed_source(self, dependency, target, prev_ni, repo_node=None): target_env = dependency.get_build_env() type = target_env.get_tgt_sig_type() if type == 'source': return target_env.decide_source(dependency, target, prev_ni, repo_node) else: return target_env.decide_target(dependency, target, prev_ni, repo_node) def _changed_timestamp_then_content(self, dependency, target, prev_ni, repo_node=None): return dependency.changed_timestamp_then_content(target, prev_ni, repo_node) def _changed_timestamp_newer(self, dependency, target, prev_ni, repo_node=None): return dependency.changed_timestamp_newer(target, prev_ni, repo_node) def _changed_timestamp_match(self, dependency, target, prev_ni, repo_node=None): return dependency.changed_timestamp_match(target, prev_ni, repo_node) def _copy_from_cache(self, src, dst): return self.fs.copy(src, dst) def _copy2_from_cache(self, src, dst): return self.fs.copy2(src, dst) def Decider(self, function): copy_function = self._copy2_from_cache if function in ('MD5', 'content'): if not SCons.Util.md5: raise UserError("MD5 signatures are not available in this version of Python.") function = self._changed_content elif function == 'MD5-timestamp': function = self._changed_timestamp_then_content elif function in ('timestamp-newer', 'make'): function = self._changed_timestamp_newer copy_function = self._copy_from_cache elif function == 'timestamp-match': function = self._changed_timestamp_match elif not callable(function): raise UserError("Unknown Decider value %s" % repr(function)) # We don't use AddMethod because we don't want to turn the # function, which only expects three arguments, into a bound # method, which would add self as an initial, fourth argument. self.decide_target = function self.decide_source = function self.copy_from_cache = copy_function def Detect(self, progs): """Return the first available program in progs. :param progs: one or more command names to check for :type progs: str or list :returns str: first name from progs that can be found. """ if not SCons.Util.is_List(progs): progs = [ progs ] for prog in progs: path = self.WhereIs(prog) if path: return prog return None def Dictionary(self, *args): """Return construction variables from an environment. :param *args: (optional) variable names to look up :returns: if args omitted, the dictionary of all constr. vars. If one arg, the corresponding value is returned. If more than one arg, a list of values is returned. :raises KeyError: if any of *args is not in the construction env. """ if not args: return self._dict dlist = [self._dict[x] for x in args] if len(dlist) == 1: dlist = dlist[0] return dlist def Dump(self, key=None): """ Return pretty-printed string of construction variables. :param key: if None, format the whole dict of variables. Else look up and format just the value for key. """ import pprint pp = pprint.PrettyPrinter(indent=2) if key: cvars = self.Dictionary(key) else: cvars = self.Dictionary() # TODO: pprint doesn't do a nice job on path-style values # if the paths contain spaces (i.e. Windows), because the # algorithm tries to break lines on spaces, while breaking # on the path-separator would be more "natural". Is there # a better way to format those? return pp.pformat(cvars) def FindIxes(self, paths, prefix, suffix): """ Search a list of paths for something that matches the prefix and suffix. paths - the list of paths or nodes. prefix - construction variable for the prefix. suffix - construction variable for the suffix. """ suffix = self.subst('$'+suffix) prefix = self.subst('$'+prefix) for path in paths: dir,name = os.path.split(str(path)) if name[:len(prefix)] == prefix and name[-len(suffix):] == suffix: return path def ParseConfig(self, command, function=None, unique=1): """ Use the specified function to parse the output of the command in order to modify the current environment. The 'command' can be a string or a list of strings representing a command and its arguments. 'Function' is an optional argument that takes the environment, the output of the command, and the unique flag. If no function is specified, MergeFlags, which treats the output as the result of a typical 'X-config' command (i.e. gtk-config), will merge the output into the appropriate variables. """ if function is None: def parse_conf(env, cmd, unique=unique): return env.MergeFlags(cmd, unique) function = parse_conf if SCons.Util.is_List(command): command = ' '.join(command) command = self.subst(command) return function(self, self.backtick(command)) def ParseDepends(self, filename, must_exist=None, only_one=0): """ Parse a mkdep-style file for explicit dependencies. This is completely abusable, and should be unnecessary in the "normal" case of proper SCons configuration, but it may help make the transition from a Make hierarchy easier for some people to swallow. It can also be genuinely useful when using a tool that can write a .d file, but for which writing a scanner would be too complicated. """ filename = self.subst(filename) try: with open(filename, 'r') as fp: lines = SCons.Util.LogicalLines(fp).readlines() except IOError: if must_exist: raise return lines = [l for l in lines if l[0] != '#'] tdlist = [] for line in lines: try: target, depends = line.split(':', 1) except (AttributeError, ValueError): # Throws AttributeError if line isn't a string. Can throw # ValueError if line doesn't split into two or more elements. pass else: tdlist.append((target.split(), depends.split())) if only_one: targets = [] for td in tdlist: targets.extend(td[0]) if len(targets) > 1: raise UserError( "More than one dependency target found in `%s': %s" % (filename, targets)) for target, depends in tdlist: self.Depends(target, depends) def Platform(self, platform): platform = self.subst(platform) return SCons.Platform.Platform(platform)(self) def Prepend(self, **kw): """Prepend values to existing construction variables in an Environment. """ kw = copy_non_reserved_keywords(kw) for key, val in kw.items(): # It would be easier on the eyes to write this using # "continue" statements whenever we finish processing an item, # but Python 1.5.2 apparently doesn't let you use "continue" # within try:-except: blocks, so we have to nest our code. try: orig = self._dict[key] except KeyError: # No existing variable in the environment, so just set # it to the new value. self._dict[key] = val else: try: # Check if the original looks like a dictionary. # If it is, we can't just try adding the value because # dictionaries don't have __add__() methods, and # things like UserList will incorrectly coerce the # original dict to a list (which we don't want). update_dict = orig.update except AttributeError: try: # Most straightforward: just try to add them # together. This will work in most cases, when the # original and new values are of compatible types. self._dict[key] = val + orig except (KeyError, TypeError): try: # Check if the added value is a list. add_to_val = val.append except AttributeError: # The added value isn't a list, but the # original is (by process of elimination), # so insert the the new value in the original # (if there's one to insert). if val: orig.insert(0, val) else: # The added value is a list, so append # the original to it (if there's a value # to append). if orig: add_to_val(orig) self._dict[key] = val else: # The original looks like a dictionary, so update it # based on what we think the value looks like. if SCons.Util.is_List(val): for v in val: orig[v] = None else: try: update_dict(val) except (AttributeError, TypeError, ValueError): if SCons.Util.is_Dict(val): for k, v in val.items(): orig[k] = v else: orig[val] = None self.scanner_map_delete(kw) def PrependENVPath(self, name, newpath, envname = 'ENV', sep = os.pathsep, delete_existing=1): """Prepend path elements to the path 'name' in the 'ENV' dictionary for this environment. Will only add any particular path once, and will normpath and normcase all paths to help assure this. This can also handle the case where the env variable is a list instead of a string. If delete_existing is 0, a newpath which is already in the path will not be moved to the front (it will be left where it is). """ orig = '' if envname in self._dict and name in self._dict[envname]: orig = self._dict[envname][name] nv = SCons.Util.PrependPath(orig, newpath, sep, delete_existing, canonicalize=self._canonicalize) if envname not in self._dict: self._dict[envname] = {} self._dict[envname][name] = nv def PrependUnique(self, delete_existing=0, **kw): """Prepend values to existing construction variables in an Environment, if they're not already there. If delete_existing is 1, removes existing values first, so values move to front. """ kw = copy_non_reserved_keywords(kw) for key, val in kw.items(): if SCons.Util.is_List(val): val = _delete_duplicates(val, not delete_existing) if key not in self._dict or self._dict[key] in ('', None): self._dict[key] = val elif SCons.Util.is_Dict(self._dict[key]) and \ SCons.Util.is_Dict(val): self._dict[key].update(val) elif SCons.Util.is_List(val): dk = self._dict[key] if not SCons.Util.is_List(dk): dk = [dk] if delete_existing: dk = [x for x in dk if x not in val] else: val = [x for x in val if x not in dk] self._dict[key] = val + dk else: dk = self._dict[key] if SCons.Util.is_List(dk): # By elimination, val is not a list. Since dk is a # list, wrap val in a list first. if delete_existing: dk = [x for x in dk if x not in val] self._dict[key] = [val] + dk else: if val not in dk: self._dict[key] = [val] + dk else: if delete_existing: dk = [x for x in dk if x not in val] self._dict[key] = val + dk self.scanner_map_delete(kw) def Replace(self, **kw): """Replace existing construction variables in an Environment with new construction variables and/or values. """ try: kwbd = kw['BUILDERS'] except KeyError: pass else: kwbd = BuilderDict(kwbd,self) del kw['BUILDERS'] self.__setitem__('BUILDERS', kwbd) kw = copy_non_reserved_keywords(kw) self._update(semi_deepcopy(kw)) self.scanner_map_delete(kw) def ReplaceIxes(self, path, old_prefix, old_suffix, new_prefix, new_suffix): """ Replace old_prefix with new_prefix and old_suffix with new_suffix. env - Environment used to interpolate variables. path - the path that will be modified. old_prefix - construction variable for the old prefix. old_suffix - construction variable for the old suffix. new_prefix - construction variable for the new prefix. new_suffix - construction variable for the new suffix. """ old_prefix = self.subst('$'+old_prefix) old_suffix = self.subst('$'+old_suffix) new_prefix = self.subst('$'+new_prefix) new_suffix = self.subst('$'+new_suffix) dir,name = os.path.split(str(path)) if name[:len(old_prefix)] == old_prefix: name = name[len(old_prefix):] if name[-len(old_suffix):] == old_suffix: name = name[:-len(old_suffix)] return os.path.join(dir, new_prefix+name+new_suffix) def SetDefault(self, **kw): for k in list(kw.keys()): if k in self._dict: del kw[k] self.Replace(**kw) def _find_toolpath_dir(self, tp): return self.fs.Dir(self.subst(tp)).srcnode().get_abspath() def Tool(self, tool, toolpath=None, **kw): if SCons.Util.is_String(tool): tool = self.subst(tool) if toolpath is None: toolpath = self.get('toolpath', []) toolpath = list(map(self._find_toolpath_dir, toolpath)) tool = SCons.Tool.Tool(tool, toolpath, **kw) tool(self) def WhereIs(self, prog, path=None, pathext=None, reject=[]): """Find prog in the path. """ if path is None: try: path = self['ENV']['PATH'] except KeyError: pass elif SCons.Util.is_String(path): path = self.subst(path) if pathext is None: try: pathext = self['ENV']['PATHEXT'] except KeyError: pass elif SCons.Util.is_String(pathext): pathext = self.subst(pathext) prog = SCons.Util.CLVar(self.subst(prog)) # support "program --with-args" path = SCons.Util.WhereIs(prog[0], path, pathext, reject) if path: return path return None ####################################################################### # Public methods for doing real "SCons stuff" (manipulating # dependencies, setting attributes on targets, etc.). These begin # with upper-case letters. The essential characteristic of methods # in this section is that they all *should* have corresponding # same-named global functions. ####################################################################### def Action(self, *args, **kw): def subst_string(a, self=self): if SCons.Util.is_String(a): a = self.subst(a) return a nargs = list(map(subst_string, args)) nkw = self.subst_kw(kw) return SCons.Action.Action(*nargs, **nkw) def AddPreAction(self, files, action): nodes = self.arg2nodes(files, self.fs.Entry) action = SCons.Action.Action(action) uniq = {} for executor in [n.get_executor() for n in nodes]: uniq[executor] = 1 for executor in uniq.keys(): executor.add_pre_action(action) return nodes def AddPostAction(self, files, action): nodes = self.arg2nodes(files, self.fs.Entry) action = SCons.Action.Action(action) uniq = {} for executor in [n.get_executor() for n in nodes]: uniq[executor] = 1 for executor in uniq.keys(): executor.add_post_action(action) return nodes def Alias(self, target, source=[], action=None, **kw): tlist = self.arg2nodes(target, self.ans.Alias) if not SCons.Util.is_List(source): source = [source] source = [_f for _f in source if _f] if not action: if not source: # There are no source files and no action, so just # return a target list of classic Alias Nodes, without # any builder. The externally visible effect is that # this will make the wrapping Script.BuildTask class # say that there's "Nothing to be done" for this Alias, # instead of that it's "up to date." return tlist # No action, but there are sources. Re-call all the target # builders to add the sources to each target. result = [] for t in tlist: bld = t.get_builder(AliasBuilder) result.extend(bld(self, t, source)) return result nkw = self.subst_kw(kw) nkw.update({ 'action' : SCons.Action.Action(action), 'source_factory' : self.fs.Entry, 'multi' : 1, 'is_explicit' : None, }) bld = SCons.Builder.Builder(**nkw) # Apply the Builder separately to each target so that the Aliases # stay separate. If we did one "normal" Builder call with the # whole target list, then all of the target Aliases would be # associated under a single Executor. result = [] for t in tlist: # Calling the convert() method will cause a new Executor to be # created from scratch, so we have to explicitly initialize # it with the target's existing sources, plus our new ones, # so nothing gets lost. b = t.get_builder() if b is None or b is AliasBuilder: b = bld else: nkw['action'] = b.action + action b = SCons.Builder.Builder(**nkw) t.convert() result.extend(b(self, t, t.sources + source)) return result def AlwaysBuild(self, *targets): tlist = [] for t in targets: tlist.extend(self.arg2nodes(t, self.fs.Entry)) for t in tlist: t.set_always_build() return tlist def Builder(self, **kw): nkw = self.subst_kw(kw) return SCons.Builder.Builder(**nkw) def CacheDir(self, path): import SCons.CacheDir if path is not None: path = self.subst(path) self._CacheDir_path = path def Clean(self, targets, files): global CleanTargets tlist = self.arg2nodes(targets, self.fs.Entry) flist = self.arg2nodes(files, self.fs.Entry) for t in tlist: try: CleanTargets[t].extend(flist) except KeyError: CleanTargets[t] = flist def Configure(self, *args, **kw): nargs = [self] if args: nargs = nargs + self.subst_list(args)[0] nkw = self.subst_kw(kw) nkw['_depth'] = kw.get('_depth', 0) + 1 try: nkw['custom_tests'] = self.subst_kw(nkw['custom_tests']) except KeyError: pass return SCons.SConf.SConf(*nargs, **nkw) def Command(self, target, source, action, **kw): """Builds the supplied target files from the supplied source files using the supplied action. Action may be any type that the Builder constructor will accept for an action.""" bkw = { 'action': action, 'target_factory': self.fs.Entry, 'source_factory': self.fs.Entry, } # source scanner try: bkw['source_scanner'] = kw['source_scanner'] except KeyError: pass else: del kw['source_scanner'] # target scanner try: bkw['target_scanner'] = kw['target_scanner'] except KeyError: pass else: del kw['target_scanner'] # source factory try: bkw['source_factory'] = kw['source_factory'] except KeyError: pass else: del kw['source_factory'] # target factory try: bkw['target_factory'] = kw['target_factory'] except KeyError: pass else: del kw['target_factory'] bld = SCons.Builder.Builder(**bkw) return bld(self, target, source, **kw) def Depends(self, target, dependency): """Explicity specify that 'target's depend on 'dependency'.""" tlist = self.arg2nodes(target, self.fs.Entry) dlist = self.arg2nodes(dependency, self.fs.Entry) for t in tlist: t.add_dependency(dlist) return tlist def Dir(self, name, *args, **kw): """ """ s = self.subst(name) if SCons.Util.is_Sequence(s): result=[] for e in s: result.append(self.fs.Dir(e, *args, **kw)) return result return self.fs.Dir(s, *args, **kw) def PyPackageDir(self, modulename): s = self.subst(modulename) if SCons.Util.is_Sequence(s): result=[] for e in s: result.append(self.fs.PyPackageDir(e)) return result return self.fs.PyPackageDir(s) def NoClean(self, *targets): """Tags a target so that it will not be cleaned by -c""" tlist = [] for t in targets: tlist.extend(self.arg2nodes(t, self.fs.Entry)) for t in tlist: t.set_noclean() return tlist def NoCache(self, *targets): """Tags a target so that it will not be cached""" tlist = [] for t in targets: tlist.extend(self.arg2nodes(t, self.fs.Entry)) for t in tlist: t.set_nocache() return tlist def Entry(self, name, *args, **kw): """ """ s = self.subst(name) if SCons.Util.is_Sequence(s): result=[] for e in s: result.append(self.fs.Entry(e, *args, **kw)) return result return self.fs.Entry(s, *args, **kw) def Environment(self, **kw): return SCons.Environment.Environment(**self.subst_kw(kw)) def Execute(self, action, *args, **kw): """Directly execute an action through an Environment """ action = self.Action(action, *args, **kw) result = action([], [], self) if isinstance(result, BuildError): errstr = result.errstr if result.filename: errstr = result.filename + ': ' + errstr sys.stderr.write("scons: *** %s\n" % errstr) return result.status else: return result def File(self, name, *args, **kw): """ """ s = self.subst(name) if SCons.Util.is_Sequence(s): result=[] for e in s: result.append(self.fs.File(e, *args, **kw)) return result return self.fs.File(s, *args, **kw) def FindFile(self, file, dirs): file = self.subst(file) nodes = self.arg2nodes(dirs, self.fs.Dir) return SCons.Node.FS.find_file(file, tuple(nodes)) def Flatten(self, sequence): return SCons.Util.flatten(sequence) def GetBuildPath(self, files): result = list(map(str, self.arg2nodes(files, self.fs.Entry))) if SCons.Util.is_List(files): return result else: return result[0] def Glob(self, pattern, ondisk=True, source=False, strings=False, exclude=None): return self.fs.Glob(self.subst(pattern), ondisk, source, strings, exclude) def Ignore(self, target, dependency): """Ignore a dependency.""" tlist = self.arg2nodes(target, self.fs.Entry) dlist = self.arg2nodes(dependency, self.fs.Entry) for t in tlist: t.add_ignore(dlist) return tlist def Literal(self, string): return SCons.Subst.Literal(string) def Local(self, *targets): ret = [] for targ in targets: if isinstance(targ, SCons.Node.Node): targ.set_local() ret.append(targ) else: for t in self.arg2nodes(targ, self.fs.Entry): t.set_local() ret.append(t) return ret def Precious(self, *targets): tlist = [] for t in targets: tlist.extend(self.arg2nodes(t, self.fs.Entry)) for t in tlist: t.set_precious() return tlist def Pseudo(self, *targets): tlist = [] for t in targets: tlist.extend(self.arg2nodes(t, self.fs.Entry)) for t in tlist: t.set_pseudo() return tlist def Repository(self, *dirs, **kw): dirs = self.arg2nodes(list(dirs), self.fs.Dir) self.fs.Repository(*dirs, **kw) def Requires(self, target, prerequisite): """Specify that 'prerequisite' must be built before 'target', (but 'target' does not actually depend on 'prerequisite' and need not be rebuilt if it changes).""" tlist = self.arg2nodes(target, self.fs.Entry) plist = self.arg2nodes(prerequisite, self.fs.Entry) for t in tlist: t.add_prerequisite(plist) return tlist def Scanner(self, *args, **kw): nargs = [] for arg in args: if SCons.Util.is_String(arg): arg = self.subst(arg) nargs.append(arg) nkw = self.subst_kw(kw) return SCons.Scanner.Base(*nargs, **nkw) def SConsignFile(self, name=".sconsign", dbm_module=None): if name is not None: name = self.subst(name) if not os.path.isabs(name): name = os.path.join(str(self.fs.SConstruct_dir), name) if name: name = os.path.normpath(name) sconsign_dir = os.path.dirname(name) if sconsign_dir and not os.path.exists(sconsign_dir): self.Execute(SCons.Defaults.Mkdir(sconsign_dir)) SCons.SConsign.File(name, dbm_module) def SideEffect(self, side_effect, target): """Tell scons that side_effects are built as side effects of building targets.""" side_effects = self.arg2nodes(side_effect, self.fs.Entry) targets = self.arg2nodes(target, self.fs.Entry) for side_effect in side_effects: if side_effect.multiple_side_effect_has_builder(): raise UserError("Multiple ways to build the same target were specified for: %s" % str(side_effect)) side_effect.add_source(targets) side_effect.side_effect = 1 self.Precious(side_effect) for target in targets: target.side_effects.append(side_effect) return side_effects def Split(self, arg): """This function converts a string or list into a list of strings or Nodes. This makes things easier for users by allowing files to be specified as a white-space separated list to be split. The input rules are: - A single string containing names separated by spaces. These will be split apart at the spaces. - A single Node instance - A list containing either strings or Node instances. Any strings in the list are not split at spaces. In all cases, the function returns a list of Nodes and strings.""" if SCons.Util.is_List(arg): return list(map(self.subst, arg)) elif SCons.Util.is_String(arg): return self.subst(arg).split() else: return [self.subst(arg)] def Value(self, value, built_value=None, name=None): """ """ return SCons.Node.Python.ValueWithMemo(value, built_value, name) def VariantDir(self, variant_dir, src_dir, duplicate=1): variant_dir = self.arg2nodes(variant_dir, self.fs.Dir)[0] src_dir = self.arg2nodes(src_dir, self.fs.Dir)[0] self.fs.VariantDir(variant_dir, src_dir, duplicate) def FindSourceFiles(self, node='.'): """ returns a list of all source files. """ node = self.arg2nodes(node, self.fs.Entry)[0] sources = [] def build_source(ss): for s in ss: if isinstance(s, SCons.Node.FS.Dir): build_source(s.all_children()) elif s.has_builder(): build_source(s.sources) elif isinstance(s.disambiguate(), SCons.Node.FS.File): sources.append(s) build_source(node.all_children()) def final_source(node): while node != node.srcnode(): node = node.srcnode() return node sources = list(map(final_source, sources)) # remove duplicates return list(set(sources)) def FindInstalledFiles(self): """ returns the list of all targets of the Install and InstallAs Builder. """ from SCons.Tool import install if install._UNIQUE_INSTALLED_FILES is None: install._UNIQUE_INSTALLED_FILES = SCons.Util.uniquer_hashables(install._INSTALLED_FILES) return install._UNIQUE_INSTALLED_FILES class OverrideEnvironment(Base): """A proxy that overrides variables in a wrapped construction environment by returning values from an overrides dictionary in preference to values from the underlying subject environment. This is a lightweight (I hope) proxy that passes through most use of attributes to the underlying Environment.Base class, but has just enough additional methods defined to act like a real construction environment with overridden values. It can wrap either a Base construction environment, or another OverrideEnvironment, which can in turn nest arbitrary OverrideEnvironments... Note that we do *not* call the underlying base class (SubsitutionEnvironment) initialization, because we get most of those from proxying the attributes of the subject construction environment. But because we subclass SubstitutionEnvironment, this class also has inherited arg2nodes() and subst*() methods; those methods can't be proxied because they need *this* object's methods to fetch the values from the overrides dictionary. """ def __init__(self, subject, overrides={}): if SCons.Debug.track_instances: logInstanceCreation(self, 'Environment.OverrideEnvironment') self.__dict__['__subject'] = subject self.__dict__['overrides'] = overrides # Methods that make this class act like a proxy. def __getattr__(self, name): attr = getattr(self.__dict__['__subject'], name) # Here we check if attr is one of the Wrapper classes. For # example when a pseudo-builder is being called from an # OverrideEnvironment. # # These wrappers when they're constructed capture the # Environment they are being constructed with and so will not # have access to overrided values. So we rebuild them with the # OverrideEnvironment so they have access to overrided values. if isinstance(attr, (MethodWrapper, BuilderWrapper)): return attr.clone(self) else: return attr def __setattr__(self, name, value): setattr(self.__dict__['__subject'], name, value) # Methods that make this class act like a dictionary. def __getitem__(self, key): try: return self.__dict__['overrides'][key] except KeyError: return self.__dict__['__subject'].__getitem__(key) def __setitem__(self, key, value): if not is_valid_construction_var(key): raise UserError("Illegal construction variable `%s'" % key) self.__dict__['overrides'][key] = value def __delitem__(self, key): try: del self.__dict__['overrides'][key] except KeyError: deleted = 0 else: deleted = 1 try: result = self.__dict__['__subject'].__delitem__(key) except KeyError: if not deleted: raise result = None return result def get(self, key, default=None): """Emulates the get() method of dictionaries.""" try: return self.__dict__['overrides'][key] except KeyError: return self.__dict__['__subject'].get(key, default) def has_key(self, key): try: self.__dict__['overrides'][key] return 1 except KeyError: return key in self.__dict__['__subject'] def __contains__(self, key): if self.__dict__['overrides'].__contains__(key): return 1 return self.__dict__['__subject'].__contains__(key) def Dictionary(self): """Emulates the items() method of dictionaries.""" d = self.__dict__['__subject'].Dictionary().copy() d.update(self.__dict__['overrides']) return d def items(self): """Emulates the items() method of dictionaries.""" return list(self.Dictionary().items()) # Overridden private construction environment methods. def _update(self, dict): """Update an environment's values directly, bypassing the normal checks that occur when users try to set items. """ self.__dict__['overrides'].update(dict) def gvars(self): return self.__dict__['__subject'].gvars() def lvars(self): lvars = self.__dict__['__subject'].lvars() lvars.update(self.__dict__['overrides']) return lvars # Overridden public construction environment methods. def Replace(self, **kw): kw = copy_non_reserved_keywords(kw) self.__dict__['overrides'].update(semi_deepcopy(kw)) # The entry point that will be used by the external world # to refer to a construction environment. This allows the wrapper # interface to extend a construction environment for its own purposes # by subclassing SCons.Environment.Base and then assigning the # class to SCons.Environment.Environment. Environment = Base def NoSubstitutionProxy(subject): """ An entry point for returning a proxy subclass instance that overrides the subst*() methods so they don't actually perform construction variable substitution. This is specifically intended to be the shim layer in between global function calls (which don't want construction variable substitution) and the DefaultEnvironment() (which would substitute variables if left to its own devices). We have to wrap this in a function that allows us to delay definition of the class until it's necessary, so that when it subclasses Environment it will pick up whatever Environment subclass the wrapper interface might have assigned to SCons.Environment.Environment. """ class _NoSubstitutionProxy(Environment): def __init__(self, subject): self.__dict__['__subject'] = subject def __getattr__(self, name): return getattr(self.__dict__['__subject'], name) def __setattr__(self, name, value): return setattr(self.__dict__['__subject'], name, value) def executor_to_lvars(self, kwdict): if 'executor' in kwdict: kwdict['lvars'] = kwdict['executor'].get_lvars() del kwdict['executor'] else: kwdict['lvars'] = {} def raw_to_mode(self, dict): try: raw = dict['raw'] except KeyError: pass else: del dict['raw'] dict['mode'] = raw def subst(self, string, *args, **kwargs): return string def subst_kw(self, kw, *args, **kwargs): return kw def subst_list(self, string, *args, **kwargs): nargs = (string, self,) + args nkw = kwargs.copy() nkw['gvars'] = {} self.executor_to_lvars(nkw) self.raw_to_mode(nkw) return SCons.Subst.scons_subst_list(*nargs, **nkw) def subst_target_source(self, string, *args, **kwargs): nargs = (string, self,) + args nkw = kwargs.copy() nkw['gvars'] = {} self.executor_to_lvars(nkw) self.raw_to_mode(nkw) return SCons.Subst.scons_subst(*nargs, **nkw) return _NoSubstitutionProxy(subject) # Local Variables: # tab-width:4 # indent-tabs-mode:nil # End: # vim: set expandtab tabstop=4 shiftwidth=4: