Util.py.svn-base
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- """SCons.Util
- Various utility functions go here.
- """
- #
- # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 The SCons Foundation
- #
- # Permission is hereby granted, free of charge, to any person obtaining
- # a copy of this software and associated documentation files (the
- # "Software"), to deal in the Software without restriction, including
- # without limitation the rights to use, copy, modify, merge, publish,
- # distribute, sublicense, and/or sell copies of the Software, and to
- # permit persons to whom the Software is furnished to do so, subject to
- # the following conditions:
- #
- # The above copyright notice and this permission notice shall be included
- # in all copies or substantial portions of the Software.
- #
- # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
- # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
- # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- #
- __revision__ = "src/engine/SCons/Util.py 3057 2008/06/09 22:21:00 knight"
- import SCons.compat
- import copy
- import os
- import os.path
- import re
- import string
- import sys
- import types
- from UserDict import UserDict
- from UserList import UserList
- from UserString import UserString
- # Don't "from types import ..." these because we need to get at the
- # types module later to look for UnicodeType.
- DictType = types.DictType
- InstanceType = types.InstanceType
- ListType = types.ListType
- StringType = types.StringType
- TupleType = types.TupleType
- def dictify(keys, values, result={}):
- for k, v in zip(keys, values):
- result[k] = v
- return result
- _altsep = os.altsep
- if _altsep is None and sys.platform == 'win32':
- # My ActivePython 2.0.1 doesn't set os.altsep! What gives?
- _altsep = '/'
- if _altsep:
- def rightmost_separator(path, sep, _altsep=_altsep):
- rfind = string.rfind
- return max(rfind(path, sep), rfind(path, _altsep))
- else:
- rightmost_separator = string.rfind
- # First two from the Python Cookbook, just for completeness.
- # (Yeah, yeah, YAGNI...)
- def containsAny(str, set):
- """Check whether sequence str contains ANY of the items in set."""
- for c in set:
- if c in str: return 1
- return 0
- def containsAll(str, set):
- """Check whether sequence str contains ALL of the items in set."""
- for c in set:
- if c not in str: return 0
- return 1
- def containsOnly(str, set):
- """Check whether sequence str contains ONLY items in set."""
- for c in str:
- if c not in set: return 0
- return 1
- def splitext(path):
- "Same as os.path.splitext() but faster."
- sep = rightmost_separator(path, os.sep)
- dot = string.rfind(path, '.')
- # An ext is only real if it has at least one non-digit char
- if dot > sep and not containsOnly(path[dot:], "0123456789."):
- return path[:dot],path[dot:]
- else:
- return path,""
- def updrive(path):
- """
- Make the drive letter (if any) upper case.
- This is useful because Windows is inconsitent on the case
- of the drive letter, which can cause inconsistencies when
- calculating command signatures.
- """
- drive, rest = os.path.splitdrive(path)
- if drive:
- path = string.upper(drive) + rest
- return path
- class CallableComposite(UserList):
- """A simple composite callable class that, when called, will invoke all
- of its contained callables with the same arguments."""
- def __call__(self, *args, **kwargs):
- retvals = map(lambda x, args=args, kwargs=kwargs: apply(x,
- args,
- kwargs),
- self.data)
- if self.data and (len(self.data) == len(filter(callable, retvals))):
- return self.__class__(retvals)
- return NodeList(retvals)
- class NodeList(UserList):
- """This class is almost exactly like a regular list of Nodes
- (actually it can hold any object), with one important difference.
- If you try to get an attribute from this list, it will return that
- attribute from every item in the list. For example:
- >>> someList = NodeList([ ' foo ', ' bar ' ])
- >>> someList.strip()
- [ 'foo', 'bar' ]
- """
- def __nonzero__(self):
- return len(self.data) != 0
- def __str__(self):
- return string.join(map(str, self.data))
- def __getattr__(self, name):
- if not self.data:
- # If there is nothing in the list, then we have no attributes to
- # pass through, so raise AttributeError for everything.
- raise AttributeError, "NodeList has no attribute: %s" % name
- # Return a list of the attribute, gotten from every element
- # in the list
- attrList = map(lambda x, n=name: getattr(x, n), self.data)
- # Special case. If the attribute is callable, we do not want
- # to return a list of callables. Rather, we want to return a
- # single callable that, when called, will invoke the function on
- # all elements of this list.
- if self.data and (len(self.data) == len(filter(callable, attrList))):
- return CallableComposite(attrList)
- return self.__class__(attrList)
- _get_env_var = re.compile(r'^$([_a-zA-Z]w*|{[_a-zA-Z]w*})$')
- def get_environment_var(varstr):
- """Given a string, first determine if it looks like a reference
- to a single environment variable, like "$FOO" or "${FOO}".
- If so, return that variable with no decorations ("FOO").
- If not, return None."""
- mo=_get_env_var.match(to_String(varstr))
- if mo:
- var = mo.group(1)
- if var[0] == '{':
- return var[1:-1]
- else:
- return var
- else:
- return None
- class DisplayEngine:
- def __init__(self):
- self.__call__ = self.print_it
- def print_it(self, text, append_newline=1):
- if append_newline: text = text + 'n'
- try:
- sys.stdout.write(text)
- except IOError:
- # Stdout might be connected to a pipe that has been closed
- # by now. The most likely reason for the pipe being closed
- # is that the user has press ctrl-c. It this is the case,
- # then SCons is currently shutdown. We therefore ignore
- # IOError's here so that SCons can continue and shutdown
- # properly so that the .sconsign is correctly written
- # before SCons exits.
- pass
- def dont_print(self, text, append_newline=1):
- pass
- def set_mode(self, mode):
- if mode:
- self.__call__ = self.print_it
- else:
- self.__call__ = self.dont_print
- def render_tree(root, child_func, prune=0, margin=[0], visited={}):
- """
- Render a tree of nodes into an ASCII tree view.
- root - the root node of the tree
- child_func - the function called to get the children of a node
- prune - don't visit the same node twice
- margin - the format of the left margin to use for children of root.
- 1 results in a pipe, and 0 results in no pipe.
- visited - a dictionary of visited nodes in the current branch if not prune,
- or in the whole tree if prune.
- """
- rname = str(root)
- children = child_func(root)
- retval = ""
- for pipe in margin[:-1]:
- if pipe:
- retval = retval + "| "
- else:
- retval = retval + " "
- if visited.has_key(rname):
- return retval + "+-[" + rname + "]n"
- retval = retval + "+-" + rname + "n"
- if not prune:
- visited = copy.copy(visited)
- visited[rname] = 1
- for i in range(len(children)):
- margin.append(i<len(children)-1)
- retval = retval + render_tree(children[i], child_func, prune, margin, visited
- )
- margin.pop()
- return retval
- IDX = lambda N: N and 1 or 0
- def print_tree(root, child_func, prune=0, showtags=0, margin=[0], visited={}):
- """
- Print a tree of nodes. This is like render_tree, except it prints
- lines directly instead of creating a string representation in memory,
- so that huge trees can be printed.
- root - the root node of the tree
- child_func - the function called to get the children of a node
- prune - don't visit the same node twice
- showtags - print status information to the left of each node line
- margin - the format of the left margin to use for children of root.
- 1 results in a pipe, and 0 results in no pipe.
- visited - a dictionary of visited nodes in the current branch if not prune,
- or in the whole tree if prune.
- """
- rname = str(root)
- if showtags:
- if showtags == 2:
- print ' E = exists'
- print ' R = exists in repository only'
- print ' b = implicit builder'
- print ' B = explicit builder'
- print ' S = side effect'
- print ' P = precious'
- print ' A = always build'
- print ' C = current'
- print ' N = no clean'
- print ' H = no cache'
- print ''
- tags = ['[']
- tags.append(' E'[IDX(root.exists())])
- tags.append(' R'[IDX(root.rexists() and not root.exists())])
- tags.append(' BbB'[[0,1][IDX(root.has_explicit_builder())] +
- [0,2][IDX(root.has_builder())]])
- tags.append(' S'[IDX(root.side_effect)])
- tags.append(' P'[IDX(root.precious)])
- tags.append(' A'[IDX(root.always_build)])
- tags.append(' C'[IDX(root.is_up_to_date())])
- tags.append(' N'[IDX(root.noclean)])
- tags.append(' H'[IDX(root.nocache)])
- tags.append(']')
- else:
- tags = []
- def MMM(m):
- return [" ","| "][m]
- margins = map(MMM, margin[:-1])
- children = child_func(root)
- if prune and visited.has_key(rname) and children:
- print string.join(tags + margins + ['+-[', rname, ']'], '')
- return
- print string.join(tags + margins + ['+-', rname], '')
- visited[rname] = 1
- if children:
- margin.append(1)
- map(lambda C, cf=child_func, p=prune, i=IDX(showtags), m=margin, v=visited:
- print_tree(C, cf, p, i, m, v),
- children[:-1])
- margin[-1] = 0
- print_tree(children[-1], child_func, prune, IDX(showtags), margin, visited)
- margin.pop()
- # Functions for deciding if things are like various types, mainly to
- # handle UserDict, UserList and UserString like their underlying types.
- #
- # Yes, all of this manual testing breaks polymorphism, and the real
- # Pythonic way to do all of this would be to just try it and handle the
- # exception, but handling the exception when it's not the right type is
- # often too slow.
- try:
- class mystr(str):
- pass
- except TypeError:
- # An older Python version without new-style classes.
- #
- # The actual implementations here have been selected after timings
- # coded up in in bench/is_types.py (from the SCons source tree,
- # see the scons-src distribution), mostly against Python 1.5.2.
- # Key results from those timings:
- #
- # -- Storing the type of the object in a variable (t = type(obj))
- # slows down the case where it's a native type and the first
- # comparison will match, but nicely speeds up the case where
- # it's a different native type. Since that's going to be
- # common, it's a good tradeoff.
- #
- # -- The data show that calling isinstance() on an object that's
- # a native type (dict, list or string) is expensive enough
- # that checking up front for whether the object is of type
- # InstanceType is a pretty big win, even though it does slow
- # down the case where it really *is* an object instance a
- # little bit.
- def is_Dict(obj):
- t = type(obj)
- return t is DictType or
- (t is InstanceType and isinstance(obj, UserDict))
- def is_List(obj):
- t = type(obj)
- return t is ListType
- or (t is InstanceType and isinstance(obj, UserList))
- def is_Sequence(obj):
- t = type(obj)
- return t is ListType
- or t is TupleType
- or (t is InstanceType and isinstance(obj, UserList))
- def is_Tuple(obj):
- t = type(obj)
- return t is TupleType
- if hasattr(types, 'UnicodeType'):
- def is_String(obj):
- t = type(obj)
- return t is StringType
- or t is UnicodeType
- or (t is InstanceType and isinstance(obj, UserString))
- else:
- def is_String(obj):
- t = type(obj)
- return t is StringType
- or (t is InstanceType and isinstance(obj, UserString))
- def is_Scalar(obj):
- return is_String(obj) or not is_Sequence(obj)
- def flatten(obj, result=None):
- """Flatten a sequence to a non-nested list.
- Flatten() converts either a single scalar or a nested sequence
- to a non-nested list. Note that flatten() considers strings
- to be scalars instead of sequences like Python would.
- """
- if is_Scalar(obj):
- return [obj]
- if result is None:
- result = []
- for item in obj:
- if is_Scalar(item):
- result.append(item)
- else:
- flatten_sequence(item, result)
- return result
- def flatten_sequence(sequence, result=None):
- """Flatten a sequence to a non-nested list.
- Same as flatten(), but it does not handle the single scalar
- case. This is slightly more efficient when one knows that
- the sequence to flatten can not be a scalar.
- """
- if result is None:
- result = []
- for item in sequence:
- if is_Scalar(item):
- result.append(item)
- else:
- flatten_sequence(item, result)
- return result
- #
- # Generic convert-to-string functions that abstract away whether or
- # not the Python we're executing has Unicode support. The wrapper
- # to_String_for_signature() will use a for_signature() method if the
- # specified object has one.
- #
- if hasattr(types, 'UnicodeType'):
- UnicodeType = types.UnicodeType
- def to_String(s):
- if isinstance(s, UserString):
- t = type(s.data)
- else:
- t = type(s)
- if t is UnicodeType:
- return unicode(s)
- else:
- return str(s)
- else:
- to_String = str
- def to_String_for_signature(obj):
- try:
- f = obj.for_signature
- except AttributeError:
- return to_String_for_subst(obj)
- else:
- return f()
- def to_String_for_subst(s):
- if is_Sequence( s ):
- return string.join( map(to_String_for_subst, s) )
- return to_String( s )
- else:
- # A modern Python version with new-style classes, so we can just use
- # isinstance().
- #
- # We are using the following trick to speed-up these
- # functions. Default arguments are used to take a snapshot of the
- # the global functions and constants used by these functions. This
- # transforms accesses to global variable into local variables
- # accesses (i.e. LOAD_FAST instead of LOAD_GLOBAL).
- DictTypes = (dict, UserDict)
- ListTypes = (list, UserList)
- SequenceTypes = (list, tuple, UserList)
- # Empirically, Python versions with new-style classes all have
- # unicode.
- #
- # Note that profiling data shows a speed-up when comparing
- # explicitely with str and unicode instead of simply comparing
- # with basestring. (at least on Python 2.5.1)
- StringTypes = (str, unicode, UserString)
- # Empirically, it is faster to check explicitely for str and
- # unicode than for basestring.
- BaseStringTypes = (str, unicode)
- def is_Dict(obj, isinstance=isinstance, DictTypes=DictTypes):
- return isinstance(obj, DictTypes)
- def is_List(obj, isinstance=isinstance, ListTypes=ListTypes):
- return isinstance(obj, ListTypes)
- def is_Sequence(obj, isinstance=isinstance, SequenceTypes=SequenceTypes):
- return isinstance(obj, SequenceTypes)
- def is_Tuple(obj, isinstance=isinstance, tuple=tuple):
- return isinstance(obj, tuple)
- def is_String(obj, isinstance=isinstance, StringTypes=StringTypes):
- return isinstance(obj, StringTypes)
- def is_Scalar(obj, isinstance=isinstance, StringTypes=StringTypes, SequenceTypes=SequenceTypes):
- # Profiling shows that there is an impressive speed-up of 2x
- # when explicitely checking for strings instead of just not
- # sequence when the argument (i.e. obj) is already a string.
- # But, if obj is a not string than it is twice as fast to
- # check only for 'not sequence'. The following code therefore
- # assumes that the obj argument is a string must of the time.
- return isinstance(obj, StringTypes) or not isinstance(obj, SequenceTypes)
- def do_flatten(sequence, result, isinstance=isinstance,
- StringTypes=StringTypes, SequenceTypes=SequenceTypes):
- for item in sequence:
- if isinstance(item, StringTypes) or not isinstance(item, SequenceTypes):
- result.append(item)
- else:
- do_flatten(item, result)
- def flatten(obj, isinstance=isinstance, StringTypes=StringTypes,
- SequenceTypes=SequenceTypes, do_flatten=do_flatten):
- """Flatten a sequence to a non-nested list.
- Flatten() converts either a single scalar or a nested sequence
- to a non-nested list. Note that flatten() considers strings
- to be scalars instead of sequences like Python would.
- """
- if isinstance(obj, StringTypes) or not isinstance(obj, SequenceTypes):
- return [obj]
- result = []
- for item in obj:
- if isinstance(item, StringTypes) or not isinstance(item, SequenceTypes):
- result.append(item)
- else:
- do_flatten(item, result)
- return result
- def flatten_sequence(sequence, isinstance=isinstance, StringTypes=StringTypes,
- SequenceTypes=SequenceTypes, do_flatten=do_flatten):
- """Flatten a sequence to a non-nested list.
- Same as flatten(), but it does not handle the single scalar
- case. This is slightly more efficient when one knows that
- the sequence to flatten can not be a scalar.
- """
- result = []
- for item in sequence:
- if isinstance(item, StringTypes) or not isinstance(item, SequenceTypes):
- result.append(item)
- else:
- do_flatten(item, result)
- return result
- #
- # Generic convert-to-string functions that abstract away whether or
- # not the Python we're executing has Unicode support. The wrapper
- # to_String_for_signature() will use a for_signature() method if the
- # specified object has one.
- #
- def to_String(s,
- isinstance=isinstance, str=str,
- UserString=UserString, BaseStringTypes=BaseStringTypes):
- if isinstance(s,BaseStringTypes):
- # Early out when already a string!
- return s
- elif isinstance(s, UserString):
- # s.data can only be either a unicode or a regular
- # string. Please see the UserString initializer.
- return s.data
- else:
- return str(s)
- def to_String_for_subst(s,
- isinstance=isinstance, join=string.join, str=str, to_String=to_String,
- BaseStringTypes=BaseStringTypes, SequenceTypes=SequenceTypes,
- UserString=UserString):
-
- # Note that the test cases are sorted by order of probability.
- if isinstance(s, BaseStringTypes):
- return s
- elif isinstance(s, SequenceTypes):
- l = []
- for e in s:
- l.append(to_String_for_subst(e))
- return join( s )
- elif isinstance(s, UserString):
- # s.data can only be either a unicode or a regular
- # string. Please see the UserString initializer.
- return s.data
- else:
- return str(s)
- def to_String_for_signature(obj, to_String_for_subst=to_String_for_subst,
- AttributeError=AttributeError):
- try:
- f = obj.for_signature
- except AttributeError:
- return to_String_for_subst(obj)
- else:
- return f()
- # The SCons "semi-deep" copy.
- #
- # This makes separate copies of lists (including UserList objects)
- # dictionaries (including UserDict objects) and tuples, but just copies
- # references to anything else it finds.
- #
- # A special case is any object that has a __semi_deepcopy__() method,
- # which we invoke to create the copy, which is used by the BuilderDict
- # class because of its extra initialization argument.
- #
- # The dispatch table approach used here is a direct rip-off from the
- # normal Python copy module.
- _semi_deepcopy_dispatch = d = {}
- def _semi_deepcopy_dict(x):
- copy = {}
- for key, val in x.items():
- # The regular Python copy.deepcopy() also deepcopies the key,
- # as follows:
- #
- # copy[semi_deepcopy(key)] = semi_deepcopy(val)
- #
- # Doesn't seem like we need to, but we'll comment it just in case.
- copy[key] = semi_deepcopy(val)
- return copy
- d[types.DictionaryType] = _semi_deepcopy_dict
- def _semi_deepcopy_list(x):
- return map(semi_deepcopy, x)
- d[types.ListType] = _semi_deepcopy_list
- def _semi_deepcopy_tuple(x):
- return tuple(map(semi_deepcopy, x))
- d[types.TupleType] = _semi_deepcopy_tuple
- def _semi_deepcopy_inst(x):
- if hasattr(x, '__semi_deepcopy__'):
- return x.__semi_deepcopy__()
- elif isinstance(x, UserDict):
- return x.__class__(_semi_deepcopy_dict(x))
- elif isinstance(x, UserList):
- return x.__class__(_semi_deepcopy_list(x))
- else:
- return x
- d[types.InstanceType] = _semi_deepcopy_inst
- def semi_deepcopy(x):
- copier = _semi_deepcopy_dispatch.get(type(x))
- if copier:
- return copier(x)
- else:
- return x
- class Proxy:
- """A simple generic Proxy class, forwarding all calls to
- subject. So, for the benefit of the python newbie, what does
- this really mean? Well, it means that you can take an object, let's
- call it 'objA', and wrap it in this Proxy class, with a statement
- like this
- proxyObj = Proxy(objA),
- Then, if in the future, you do something like this
- x = proxyObj.var1,
- since Proxy does not have a 'var1' attribute (but presumably objA does),
- the request actually is equivalent to saying
- x = objA.var1
- Inherit from this class to create a Proxy."""
- def __init__(self, subject):
- """Wrap an object as a Proxy object"""
- self.__subject = subject
- def __getattr__(self, name):
- """Retrieve an attribute from the wrapped object. If the named
- attribute doesn't exist, AttributeError is raised"""
- return getattr(self.__subject, name)
- def get(self):
- """Retrieve the entire wrapped object"""
- return self.__subject
- def __cmp__(self, other):
- if issubclass(other.__class__, self.__subject.__class__):
- return cmp(self.__subject, other)
- return cmp(self.__dict__, other.__dict__)
- # attempt to load the windows registry module:
- can_read_reg = 0
- try:
- import _winreg
- can_read_reg = 1
- hkey_mod = _winreg
- RegOpenKeyEx = _winreg.OpenKeyEx
- RegEnumKey = _winreg.EnumKey
- RegEnumValue = _winreg.EnumValue
- RegQueryValueEx = _winreg.QueryValueEx
- RegError = _winreg.error
- except ImportError:
- try:
- import win32api
- import win32con
- can_read_reg = 1
- hkey_mod = win32con
- RegOpenKeyEx = win32api.RegOpenKeyEx
- RegEnumKey = win32api.RegEnumKey
- RegEnumValue = win32api.RegEnumValue
- RegQueryValueEx = win32api.RegQueryValueEx
- RegError = win32api.error
- except ImportError:
- class _NoError(Exception):
- pass
- RegError = _NoError
- if can_read_reg:
- HKEY_CLASSES_ROOT = hkey_mod.HKEY_CLASSES_ROOT
- HKEY_LOCAL_MACHINE = hkey_mod.HKEY_LOCAL_MACHINE
- HKEY_CURRENT_USER = hkey_mod.HKEY_CURRENT_USER
- HKEY_USERS = hkey_mod.HKEY_USERS
- def RegGetValue(root, key):
- """This utility function returns a value in the registry
- without having to open the key first. Only available on
- Windows platforms with a version of Python that can read the
- registry. Returns the same thing as
- SCons.Util.RegQueryValueEx, except you just specify the entire
- path to the value, and don't have to bother opening the key
- first. So:
- Instead of:
- k = SCons.Util.RegOpenKeyEx(SCons.Util.HKEY_LOCAL_MACHINE,
- r'SOFTWAREMicrosoftWindowsCurrentVersion')
- out = SCons.Util.RegQueryValueEx(k,
- 'ProgramFilesDir')
- You can write:
- out = SCons.Util.RegGetValue(SCons.Util.HKEY_LOCAL_MACHINE,
- r'SOFTWAREMicrosoftWindowsCurrentVersionProgramFilesDir')
- """
- # I would use os.path.split here, but it's not a filesystem
- # path...
- p = key.rfind('\') + 1
- keyp = key[:p]
- val = key[p:]
- k = RegOpenKeyEx(root, keyp)
- return RegQueryValueEx(k,val)
- if sys.platform == 'win32':
- def WhereIs(file, path=None, pathext=None, reject=[]):
- if path is None:
- try:
- path = os.environ['PATH']
- except KeyError:
- return None
- if is_String(path):
- path = string.split(path, os.pathsep)
- if pathext is None:
- try:
- pathext = os.environ['PATHEXT']
- except KeyError:
- pathext = '.COM;.EXE;.BAT;.CMD'
- if is_String(pathext):
- pathext = string.split(pathext, os.pathsep)
- for ext in pathext:
- if string.lower(ext) == string.lower(file[-len(ext):]):
- pathext = ['']
- break
- if not is_List(reject) and not is_Tuple(reject):
- reject = [reject]
- for dir in path:
- f = os.path.join(dir, file)
- for ext in pathext:
- fext = f + ext
- if os.path.isfile(fext):
- try:
- reject.index(fext)
- except ValueError:
- return os.path.normpath(fext)
- continue
- return None
- elif os.name == 'os2':
- def WhereIs(file, path=None, pathext=None, reject=[]):
- if path is None:
- try:
- path = os.environ['PATH']
- except KeyError:
- return None
- if is_String(path):
- path = string.split(path, os.pathsep)
- if pathext is None:
- pathext = ['.exe', '.cmd']
- for ext in pathext:
- if string.lower(ext) == string.lower(file[-len(ext):]):
- pathext = ['']
- break
- if not is_List(reject) and not is_Tuple(reject):
- reject = [reject]
- for dir in path:
- f = os.path.join(dir, file)
- for ext in pathext:
- fext = f + ext
- if os.path.isfile(fext):
- try:
- reject.index(fext)
- except ValueError:
- return os.path.normpath(fext)
- continue
- return None
- else:
- def WhereIs(file, path=None, pathext=None, reject=[]):
- import stat
- if path is None:
- try:
- path = os.environ['PATH']
- except KeyError:
- return None
- if is_String(path):
- path = string.split(path, os.pathsep)
- if not is_List(reject) and not is_Tuple(reject):
- reject = [reject]
- for d in path:
- f = os.path.join(d, file)
- if os.path.isfile(f):
- try:
- st = os.stat(f)
- except OSError:
- # os.stat() raises OSError, not IOError if the file
- # doesn't exist, so in this case we let IOError get
- # raised so as to not mask possibly serious disk or
- # network issues.
- continue
- if stat.S_IMODE(st[stat.ST_MODE]) & 0111:
- try:
- reject.index(f)
- except ValueError:
- return os.path.normpath(f)
- continue
- return None
- def PrependPath(oldpath, newpath, sep = os.pathsep):
- """This prepends newpath elements to the given oldpath. Will only
- add any particular path once (leaving the first one it encounters
- and ignoring the rest, to preserve path order), and will
- os.path.normpath and os.path.normcase all paths to help assure
- this. This can also handle the case where the given old path
- variable is a list instead of a string, in which case a list will
- be returned instead of a string.
- Example:
- Old Path: "/foo/bar:/foo"
- New Path: "/biz/boom:/foo"
- Result: "/biz/boom:/foo:/foo/bar"
- """
- orig = oldpath
- is_list = 1
- paths = orig
- if not is_List(orig) and not is_Tuple(orig):
- paths = string.split(paths, sep)
- is_list = 0
- if is_List(newpath) or is_Tuple(newpath):
- newpaths = newpath
- else:
- newpaths = string.split(newpath, sep)
- newpaths = newpaths + paths # prepend new paths
- normpaths = []
- paths = []
- # now we add them only if they are unique
- for path in newpaths:
- normpath = os.path.normpath(os.path.normcase(path))
- if path and not normpath in normpaths:
- paths.append(path)
- normpaths.append(normpath)
- if is_list:
- return paths
- else:
- return string.join(paths, sep)
- def AppendPath(oldpath, newpath, sep = os.pathsep):
- """This appends new path elements to the given old path. Will
- only add any particular path once (leaving the last one it
- encounters and ignoring the rest, to preserve path order), and
- will os.path.normpath and os.path.normcase all paths to help
- assure this. This can also handle the case where the given old
- path variable is a list instead of a string, in which case a list
- will be returned instead of a string.
- Example:
- Old Path: "/foo/bar:/foo"
- New Path: "/biz/boom:/foo"
- Result: "/foo/bar:/biz/boom:/foo"
- """
- orig = oldpath
- is_list = 1
- paths = orig
- if not is_List(orig) and not is_Tuple(orig):
- paths = string.split(paths, sep)
- is_list = 0
- if is_List(newpath) or is_Tuple(newpath):
- newpaths = newpath
- else:
- newpaths = string.split(newpath, sep)
- newpaths = paths + newpaths # append new paths
- newpaths.reverse()
- normpaths = []
- paths = []
- # now we add them only of they are unique
- for path in newpaths:
- normpath = os.path.normpath(os.path.normcase(path))
- if path and not normpath in normpaths:
- paths.append(path)
- normpaths.append(normpath)
- paths.reverse()
- if is_list:
- return paths
- else:
- return string.join(paths, sep)
- if sys.platform == 'cygwin':
- def get_native_path(path):
- """Transforms an absolute path into a native path for the system. In
- Cygwin, this converts from a Cygwin path to a Windows one."""
- return string.replace(os.popen('cygpath -w ' + path).read(), 'n', '')
- else:
- def get_native_path(path):
- """Transforms an absolute path into a native path for the system.
- Non-Cygwin version, just leave the path alone."""
- return path
- display = DisplayEngine()
- def Split(arg):
- if is_List(arg) or is_Tuple(arg):
- return arg
- elif is_String(arg):
- return string.split(arg)
- else:
- return [arg]
- class CLVar(UserList):
- """A class for command-line construction variables.
- This is a list that uses Split() to split an initial string along
- white-space arguments, and similarly to split any strings that get
- added. This allows us to Do the Right Thing with Append() and
- Prepend() (as well as straight Python foo = env['VAR'] + 'arg1
- arg2') regardless of whether a user adds a list or a string to a
- command-line construction variable.
- """
- def __init__(self, seq = []):
- UserList.__init__(self, Split(seq))
- def __coerce__(self, other):
- return (self, CLVar(other))
- def __str__(self):
- return string.join(self.data)
- # A dictionary that preserves the order in which items are added.
- # Submitted by David Benjamin to ActiveState's Python Cookbook web site:
- # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/107747
- # Including fixes/enhancements from the follow-on discussions.
- class OrderedDict(UserDict):
- def __init__(self, dict = None):
- self._keys = []
- UserDict.__init__(self, dict)
- def __delitem__(self, key):
- UserDict.__delitem__(self, key)
- self._keys.remove(key)
- def __setitem__(self, key, item):
- UserDict.__setitem__(self, key, item)
- if key not in self._keys: self._keys.append(key)
- def clear(self):
- UserDict.clear(self)
- self._keys = []
- def copy(self):
- dict = OrderedDict()
- dict.update(self)
- return dict
- def items(self):
- return zip(self._keys, self.values())
- def keys(self):
- return self._keys[:]
- def popitem(self):
- try:
- key = self._keys[-1]
- except IndexError:
- raise KeyError('dictionary is empty')
- val = self[key]
- del self[key]
- return (key, val)
- def setdefault(self, key, failobj = None):
- UserDict.setdefault(self, key, failobj)
- if key not in self._keys: self._keys.append(key)
- def update(self, dict):
- for (key, val) in dict.items():
- self.__setitem__(key, val)
- def values(self):
- return map(self.get, self._keys)
- class Selector(OrderedDict):
- """A callable ordered dictionary that maps file suffixes to
- dictionary values. We preserve the order in which items are added
- so that get_suffix() calls always return the first suffix added."""
- def __call__(self, env, source):
- try:
- ext = source[0].suffix
- except IndexError:
- ext = ""
- try:
- return self[ext]
- except KeyError:
- # Try to perform Environment substitution on the keys of
- # the dictionary before giving up.
- s_dict = {}
- for (k,v) in self.items():
- if not k is None:
- s_k = env.subst(k)
- if s_dict.has_key(s_k):
- # We only raise an error when variables point
- # to the same suffix. If one suffix is literal
- # and a variable suffix contains this literal,
- # the literal wins and we don't raise an error.
- raise KeyError, (s_dict[s_k][0], k, s_k)
- s_dict[s_k] = (k,v)
- try:
- return s_dict[ext][1]
- except KeyError:
- try:
- return self[None]
- except KeyError:
- return None
- if sys.platform == 'cygwin':
- # On Cygwin, os.path.normcase() lies, so just report back the
- # fact that the underlying Windows OS is case-insensitive.
- def case_sensitive_suffixes(s1, s2):
- return 0
- else:
- def case_sensitive_suffixes(s1, s2):
- return (os.path.normcase(s1) != os.path.normcase(s2))
- def adjustixes(fname, pre, suf, ensure_suffix=False):
- if pre:
- path, fn = os.path.split(os.path.normpath(fname))
- if fn[:len(pre)] != pre:
- fname = os.path.join(path, pre + fn)
- # Only append a suffix if the suffix we're going to add isn't already
- # there, and if either we've been asked to ensure the specific suffix
- # is present or there's no suffix on it at all.
- if suf and fname[-len(suf):] != suf and
- (ensure_suffix or not splitext(fname)[1]):
- fname = fname + suf
- return fname
- # From Tim Peters,
- # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52560
- # ASPN: Python Cookbook: Remove duplicates from a sequence
- # (Also in the printed Python Cookbook.)
- def unique(s):
- """Return a list of the elements in s, but without duplicates.
- For example, unique([1,2,3,1,2,3]) is some permutation of [1,2,3],
- unique("abcabc") some permutation of ["a", "b", "c"], and
- unique(([1, 2], [2, 3], [1, 2])) some permutation of
- [[2, 3], [1, 2]].
- For best speed, all sequence elements should be hashable. Then
- unique() will usually work in linear time.
- If not possible, the sequence elements should enjoy a total
- ordering, and if list(s).sort() doesn't raise TypeError it's
- assumed that they do enjoy a total ordering. Then unique() will
- usually work in O(N*log2(N)) time.
- If that's not possible either, the sequence elements must support
- equality-testing. Then unique() will usually work in quadratic
- time.
- """
- n = len(s)
- if n == 0:
- return []
- # Try using a dict first, as that's the fastest and will usually
- # work. If it doesn't work, it will usually fail quickly, so it
- # usually doesn't cost much to *try* it. It requires that all the
- # sequence elements be hashable, and support equality comparison.
- u = {}
- try:
- for x in s:
- u[x] = 1
- except TypeError:
- pass # move on to the next method
- else:
- return u.keys()
- del u
- # We can't hash all the elements. Second fastest is to sort,
- # which brings the equal elements together; then duplicates are
- # easy to weed out in a single pass.
- # NOTE: Python's list.sort() was designed to be efficient in the
- # presence of many duplicate elements. This isn't true of all
- # sort functions in all languages or libraries, so this approach
- # is more effective in Python than it may be elsewhere.
- try:
- t = list(s)
- t.sort()
- except TypeError:
- pass # move on to the next method
- else:
- assert n > 0
- last = t[0]
- lasti = i = 1
- while i < n:
- if t[i] != last:
- t[lasti] = last = t[i]
- lasti = lasti + 1
- i = i + 1
- return t[:lasti]
- del t
- # Brute force is all that's left.
- u = []
- for x in s:
- if x not in u:
- u.append(x)
- return u
- # From Alex Martelli,
- # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52560
- # ASPN: Python Cookbook: Remove duplicates from a sequence
- # First comment, dated 2001/10/13.
- # (Also in the printed Python Cookbook.)
- def uniquer(seq, idfun=None):
- if idfun is None:
- def idfun(x): return x
- seen = {}
- result = []
- for item in seq:
- marker = idfun(item)
- # in old Python versions:
- # if seen.has_key(marker)
- # but in new ones:
- if marker in seen: continue
- seen[marker] = 1
- result.append(item)
- return result
- # A more efficient implementation of Alex's uniquer(), this avoids the
- # idfun() argument and function-call overhead by assuming that all
- # items in the sequence are hashable.
- def uniquer_hashables(seq):
- seen = {}
- result = []
- for item in seq:
- #if not item in seen:
- if not seen.has_key(item):
- seen[item] = 1
- result.append(item)
- return result
- # Much of the logic here was originally based on recipe 4.9 from the
- # Python CookBook, but we had to dumb it way down for Python 1.5.2.
- class LogicalLines:
- def __init__(self, fileobj):
- self.fileobj = fileobj
- def readline(self):
- result = []
- while 1:
- line = self.fileobj.readline()
- if not line:
- break
- if line[-2:] == '\n':
- result.append(line[:-2])
- else:
- result.append(line)
- break
- return string.join(result, '')
- def readlines(self):
- result = []
- while 1:
- line = self.readline()
- if not line:
- break
- result.append(line)
- return result
- class UniqueList(UserList):
- def __init__(self, seq = []):
- UserList.__init__(self, seq)
- self.unique = True
- def __make_unique(self):
- if not self.unique:
- self.data = uniquer_hashables(self.data)
- self.unique = True
- def __lt__(self, other):
- self.__make_unique()
- return UserList.__lt__(self, other)
- def __le__(self, other):
- self.__make_unique()
- return UserList.__le__(self, other)
- def __eq__(self, other):
- self.__make_unique()
- return UserList.__eq__(self, other)
- def __ne__(self, other):
- self.__make_unique()
- return UserList.__ne__(self, other)
- def __gt__(self, other):
- self.__make_unique()
- return UserList.__gt__(self, other)
- def __ge__(self, other):
- self.__make_unique()
- return UserList.__ge__(self, other)
- def __cmp__(self, other):
- self.__make_unique()
- return UserList.__cmp__(self, other)
- def __len__(self):
- self.__make_unique()
- return UserList.__len__(self)
- def __getitem__(self, i):
- self.__make_unique()
- return UserList.__getitem__(self, i)
- def __setitem__(self, i, item):
- UserList.__setitem__(self, i, item)
- self.unique = False
- def __getslice__(self, i, j):
- self.__make_unique()
- return UserList.__getslice__(self, i, j)
- def __setslice__(self, i, j, other):
- UserList.__setslice__(self, i, j, other)
- self.unique = False
- def __add__(self, other):
- result = UserList.__add__(self, other)
- result.unique = False
- return result
- def __radd__(self, other):
- result = UserList.__radd__(self, other)
- result.unique = False
- return result
- def __iadd__(self, other):
- result = UserList.__iadd__(self, other)
- result.unique = False
- return result
- def __mul__(self, other):
- result = UserList.__mul__(self, other)
- result.unique = False
- return result
- def __rmul__(self, other):
- result = UserList.__rmul__(self, other)
- result.unique = False
- return result
- def __imul__(self, other):
- result = UserList.__imul__(self, other)
- result.unique = False
- return result
- def append(self, item):
- UserList.append(self, item)
- self.unique = False
- def insert(self, i):
- UserList.insert(self, i)
- self.unique = False
- def count(self, item):
- self.__make_unique()
- return UserList.count(self, item)
- def index(self, item):
- self.__make_unique()
- return UserList.index(self, item)
- def reverse(self):
- self.__make_unique()
- UserList.reverse(self)
- def sort(self, *args, **kwds):
- self.__make_unique()
- #return UserList.sort(self, *args, **kwds)
- return apply(UserList.sort, (self,)+args, kwds)
- def extend(self, other):
- UserList.extend(self, other)
- self.unique = False
- class Unbuffered:
- """
- A proxy class that wraps a file object, flushing after every write,
- and delegating everything else to the wrapped object.
- """
- def __init__(self, file):
- self.file = file
- def write(self, arg):
- try:
- self.file.write(arg)
- self.file.flush()
- except IOError:
- # Stdout might be connected to a pipe that has been closed
- # by now. The most likely reason for the pipe being closed
- # is that the user has press ctrl-c. It this is the case,
- # then SCons is currently shutdown. We therefore ignore
- # IOError's here so that SCons can continue and shutdown
- # properly so that the .sconsign is correctly written
- # before SCons exits.
- pass
- def __getattr__(self, attr):
- return getattr(self.file, attr)
- def make_path_relative(path):
- """ makes an absolute path name to a relative pathname.
- """
- if os.path.isabs(path):
- drive_s,path = os.path.splitdrive(path)
- import re
- if not drive_s:
- path=re.compile("/*(.*)").findall(path)[0]
- else:
- path=path[1:]
- assert( not os.path.isabs( path ) ), path
- return path
- # The original idea for AddMethod() and RenameFunction() come from the
- # following post to the ActiveState Python Cookbook:
- #
- # ASPN: Python Cookbook : Install bound methods in an instance
- # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/223613
- #
- # That code was a little fragile, though, so the following changes
- # have been wrung on it:
- #
- # * Switched the installmethod() "object" and "function" arguments,
- # so the order reflects that the left-hand side is the thing being
- # "assigned to" and the right-hand side is the value being assigned.
- #
- # * Changed explicit type-checking to the "try: klass = object.__class__"
- # block in installmethod() below so that it still works with the
- # old-style classes that SCons uses.
- #
- # * Replaced the by-hand creation of methods and functions with use of
- # the "new" module, as alluded to in Alex Martelli's response to the
- # following Cookbook post:
- #
- # ASPN: Python Cookbook : Dynamically added methods to a class
- # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/81732
- def AddMethod(object, function, name = None):
- """
- Adds either a bound method to an instance or an unbound method to
- a class. If name is ommited the name of the specified function
- is used by default.
- Example:
- a = A()
- def f(self, x, y):
- self.z = x + y
- AddMethod(f, A, "add")
- a.add(2, 4)
- print a.z
- AddMethod(lambda self, i: self.l[i], a, "listIndex")
- print a.listIndex(5)
- """
- import new
- if name is None:
- name = function.func_name
- else:
- function = RenameFunction(function, name)
- try:
- klass = object.__class__
- except AttributeError:
- # "object" is really a class, so it gets an unbound method.
- object.__dict__[name] = new.instancemethod(function, None, object)
- else:
- # "object" is really an instance, so it gets a bound method.
- object.__dict__[name] = new.instancemethod(function, object, klass)
- def RenameFunction(function, name):
- """
- Returns a function identical to the specified function, but with
- the specified name.
- """
- import new
- # Compatibility for Python 1.5 and 2.1. Can be removed in favor of
- # passing function.func_defaults directly to new.function() once
- # we base on Python 2.2 or later.
- func_defaults = function.func_defaults
- if func_defaults is None:
- func_defaults = ()
- return new.function(function.func_code,
- function.func_globals,
- name,
- func_defaults)
- md5 = False
- def MD5signature(s):
- return str(s)
- try:
- import hashlib
- except ImportError:
- pass
- else:
- if hasattr(hashlib, 'md5'):
- md5 = True
- def MD5signature(s):
- m = hashlib.md5()
- m.update(str(s))
- return m.hexdigest()
- def MD5collect(signatures):
- """
- Collects a list of signatures into an aggregate signature.
- signatures - a list of signatures
- returns - the aggregate signature
- """
- if len(signatures) == 1:
- return signatures[0]
- else:
- return MD5signature(string.join(signatures, ', '))
- # From Dinu C. Gherman,
- # Python Cookbook, second edition, recipe 6.17, p. 277.
- # Also:
- # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/68205
- # ASPN: Python Cookbook: Null Object Design Pattern
- class Null:
- """ Null objects always and reliably "do nothging." """
- def __new__(cls, *args, **kwargs):
- if not '_inst' in vars(cls):
- #cls._inst = type.__new__(cls, *args, **kwargs)
- cls._inst = apply(type.__new__, (cls,) + args, kwargs)
- return cls._inst
- def __init__(self, *args, **kwargs):
- pass
- def __call__(self, *args, **kwargs):
- return self
- def __repr__(self):
- return "Null()"
- def __nonzero__(self):
- return False
- def __getattr__(self, mname):
- return self
- def __setattr__(self, name, value):
- return self
- def __delattr__(self, name):
- return self
- del __revision__