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+#
+# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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.
+#
+
+__doc__ = """
+SCons compatibility package for old Python versions
+
+This subpackage holds modules that provide backwards-compatible
+implementations of various things that we'd like to use in SCons but which
+only show up in later versions of Python than the early, old version(s)
+we still support.
+
+Other code will not generally reference things in this package through
+the SCons.compat namespace.  The modules included here add things to
+the __builtin__ namespace or the global module list so that the rest
+of our code can use the objects and names imported here regardless of
+Python version.
+
+Simply enough, things that go in the __builtin__ name space come from
+our builtins module.
+
+The rest of the things here will be in individual compatibility modules
+that are either: 1) suitably modified copies of the future modules that
+we want to use; or 2) backwards compatible re-implementations of the
+specific portions of a future module's API that we want to use.
+
+GENERAL WARNINGS:  Implementations of functions in the SCons.compat
+modules are *NOT* guaranteed to be fully compliant with these functions in
+later versions of Python.  We are only concerned with adding functionality
+that we actually use in SCons, so be wary if you lift this code for
+other uses.  (That said, making these more nearly the same as later,
+official versions is still a desirable goal, we just don't need to be
+obsessive about it.)
+
+We name the compatibility modules with an initial '_scons_' (for example,
+_scons_subprocess.py is our compatibility module for subprocess) so
+that we can still try to import the real module name and fall back to
+our compatibility module if we get an ImportError.  The import_as()
+function defined below loads the module as the "real" name (without the
+'_scons'), after which all of the "import {module}" statements in the
+rest of our code will find our pre-loaded compatibility module.
+"""
+
+__revision__ = "src/engine/SCons/compat/__init__.py 4577 2009/12/27 19:43:56 scons"
+
+def import_as(module, name):
+    """
+    Imports the specified module (from our local directory) as the
+    specified name.
+    """
+    import imp
+    import os.path
+    dir = os.path.split(__file__)[0]
+    file, filename, suffix_mode_type = imp.find_module(module, [dir])
+    imp.load_module(name, file, filename, suffix_mode_type)
+
+import builtins
+
+try:
+    import hashlib
+except ImportError:
+    # Pre-2.5 Python has no hashlib module.
+    try:
+        import_as('_scons_hashlib', 'hashlib')
+    except ImportError:
+        # If we failed importing our compatibility module, it probably
+        # means this version of Python has no md5 module.  Don't do
+        # anything and let the higher layer discover this fact, so it
+        # can fall back to using timestamp.
+        pass
+
+try:
+    set
+except NameError:
+    # Pre-2.4 Python has no native set type
+    try:
+        # Python 2.2 and 2.3 can use the copy of the 2.[45] sets module
+        # that we grabbed.
+        import_as('_scons_sets', 'sets')
+    except (ImportError, SyntaxError):
+        # Python 1.5 (ImportError, no __future_ module) and 2.1
+        # (SyntaxError, no generators in __future__) will blow up
+        # trying to import the 2.[45] sets module, so back off to a
+        # custom sets module that can be discarded easily when we
+        # stop supporting those versions.
+        import_as('_scons_sets15', 'sets')
+    import __builtin__
+    import sets
+    __builtin__.set = sets.Set
+
+import fnmatch
+try:
+    fnmatch.filter
+except AttributeError:
+    # Pre-2.2 Python has no fnmatch.filter() function.
+    def filter(names, pat):
+        """Return the subset of the list NAMES that match PAT"""
+        import os,posixpath
+        result=[]
+        pat = os.path.normcase(pat)
+        if not fnmatch._cache.has_key(pat):
+            import re
+            res = fnmatch.translate(pat)
+            fnmatch._cache[pat] = re.compile(res)
+        match = fnmatch._cache[pat].match
+        if os.path is posixpath:
+            # normcase on posix is NOP. Optimize it away from the loop.
+            for name in names:
+                if match(name):
+                    result.append(name)
+        else:
+            for name in names:
+                if match(os.path.normcase(name)):
+                    result.append(name)
+        return result
+    fnmatch.filter = filter
+    del filter
+
+try:
+    import itertools
+except ImportError:
+    # Pre-2.3 Python has no itertools module.
+    import_as('_scons_itertools', 'itertools')
+
+# If we need the compatibility version of textwrap, it  must be imported
+# before optparse, which uses it.
+try:
+    import textwrap
+except ImportError:
+    # Pre-2.3 Python has no textwrap module.
+    import_as('_scons_textwrap', 'textwrap')
+
+try:
+    import optparse
+except ImportError:
+    # Pre-2.3 Python has no optparse module.
+    import_as('_scons_optparse', 'optparse')
+
+import os
+try:
+    os.devnull
+except AttributeError:
+    # Pre-2.4 Python has no os.devnull attribute
+    import sys
+    _names = sys.builtin_module_names
+    if 'posix' in _names:
+        os.devnull = '/dev/null'
+    elif 'nt' in _names:
+        os.devnull = 'nul'
+    os.path.devnull = os.devnull
+try:
+    os.path.lexists
+except AttributeError:
+    # Pre-2.4 Python has no os.path.lexists function
+    def lexists(path):
+        return os.path.exists(path) or os.path.islink(path)
+    os.path.lexists = lexists
+
+
+try:
+    import platform
+except ImportError:
+    # Pre-2.3 Python has no platform module.
+    import_as('_scons_platform', 'platform')
+
+
+import shlex
+try:
+    shlex.split
+except AttributeError:
+    # Pre-2.3 Python has no shlex.split() function.
+    #
+    # The full white-space splitting semantics of shlex.split() are
+    # complicated to reproduce by hand, so just use a compatibility
+    # version of the shlex module cribbed from Python 2.5 with some
+    # minor modifications for older Python versions.
+    del shlex
+    import_as('_scons_shlex', 'shlex')
+
+
+import shutil
+try:
+    shutil.move
+except AttributeError:
+    # Pre-2.3 Python has no shutil.move() function.
+    #
+    # Cribbed from Python 2.5.
+    import os
+
+    def move(src, dst):
+        """Recursively move a file or directory to another location.
+
+        If the destination is on our current filesystem, then simply use
+        rename.  Otherwise, copy src to the dst and then remove src.
+        A lot more could be done here...  A look at a mv.c shows a lot of
+        the issues this implementation glosses over.
+
+        """
+        try:
+            os.rename(src, dst)
+        except OSError:
+            if os.path.isdir(src):
+                if shutil.destinsrc(src, dst):
+                    raise Error, "Cannot move a directory '%s' into itself '%s'." % (src, dst)
+                shutil.copytree(src, dst, symlinks=True)
+                shutil.rmtree(src)
+            else:
+                shutil.copy2(src,dst)
+                os.unlink(src)
+    shutil.move = move
+    del move
+
+    def destinsrc(src, dst):
+        src = os.path.abspath(src)
+        return os.path.abspath(dst)[:len(src)] == src
+    shutil.destinsrc = destinsrc
+    del destinsrc
+
+
+try:
+    import subprocess
+except ImportError:
+    # Pre-2.4 Python has no subprocess module.
+    import_as('_scons_subprocess', 'subprocess')
+
+import sys
+try:
+    sys.version_info
+except AttributeError:
+    # Pre-1.6 Python has no sys.version_info
+    import string
+    version_string = string.split(sys.version)[0]
+    version_ints = map(int, string.split(version_string, '.'))
+    sys.version_info = tuple(version_ints + ['final', 0])
+
+try:
+    import UserString
+except ImportError:
+    # Pre-1.6 Python has no UserString module.
+    import_as('_scons_UserString', 'UserString')
+
+import tempfile
+try:
+    tempfile.mkstemp
+except AttributeError:
+    # Pre-2.3 Python has no tempfile.mkstemp function, so try to simulate it.
+    # adapted from the mkstemp implementation in python 3.
+    import os
+    import errno
+    def mkstemp(*args, **kw):
+        text = False
+        # TODO (1.5)
+        #if 'text' in kw :
+        if 'text' in kw.keys() :
+            text = kw['text']
+            del kw['text']
+        elif len( args ) == 4 :
+            text = args[3]
+            args = args[:3]
+        flags = os.O_RDWR | os.O_CREAT | os.O_EXCL
+        if not text and hasattr( os, 'O_BINARY' ) :
+            flags = flags | os.O_BINARY
+        while True:
+            try :
+                name = apply(tempfile.mktemp, args, kw)
+                fd = os.open( name, flags, 0600 )
+                return (fd, os.path.abspath(name))
+            except OSError, e:
+                if e.errno == errno.EEXIST:
+                    continue
+                raise
+
+    tempfile.mkstemp = mkstemp
+    del mkstemp
+
+
+
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: