Merge commit 'upstream/1.2.0.d20091224'

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diff --git a/src/engine/SCons/compat/builtins.py b/src/engine/SCons/compat/builtins.py
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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.
+#
+
+# Portions of the following are derived from the compat.py file in
+# Twisted, under the following copyright:
+#
+# Copyright (c) 2001-2004 Twisted Matrix Laboratories
+
+__doc__ = """
+Compatibility idioms for __builtin__ names
+
+This module adds names to the __builtin__ module for things that we want
+to use in SCons but which don't show up until later Python versions than
+the earliest ones we support.
+
+This module checks for the following __builtin__ names:
+
+        all()
+        any()
+        bool()
+        dict()
+        True
+        False
+        zip()
+
+Implementations of functions 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.)
+
+If you're looking at this with pydoc and various names don't show up in
+the FUNCTIONS or DATA output, that means those names are already built in
+to this version of Python and we don't need to add them from this module.
+"""
+
+__revision__ = "src/engine/SCons/compat/builtins.py 4577 2009/12/27 19:44:43 scons"
+
+import __builtin__
+
+try:
+    all
+except NameError:
+    # Pre-2.5 Python has no all() function.
+    def all(iterable):
+        """
+        Returns True if all elements of the iterable are true.
+        """
+        for element in iterable:
+            if not element:
+                return False
+        return True
+    __builtin__.all = all
+    all = all
+
+try:
+    any
+except NameError:
+    # Pre-2.5 Python has no any() function.
+    def any(iterable):
+        """
+        Returns True if any element of the iterable is true.
+        """
+        for element in iterable:
+            if element:
+                return True
+        return False
+    __builtin__.any = any
+    any = any
+
+try:
+    bool
+except NameError:
+    # Pre-2.2 Python has no bool() function.
+    def bool(value):
+        """Demote a value to 0 or 1, depending on its truth value.
+
+        This is not to be confused with types.BooleanType, which is
+        way too hard to duplicate in early Python versions to be
+        worth the trouble.
+        """
+        return not not value
+    __builtin__.bool = bool
+    bool = bool
+
+try:
+    dict
+except NameError:
+    # Pre-2.2 Python has no dict() keyword.
+    def dict(seq=[], **kwargs):
+        """
+        New dictionary initialization.
+        """
+        d = {}
+        for k, v in seq:
+            d[k] = v
+        d.update(kwargs)
+        return d
+    __builtin__.dict = dict
+
+try:
+    False
+except NameError:
+    # Pre-2.2 Python has no False keyword.
+    __builtin__.False = not 1
+    # Assign to False in this module namespace so it shows up in pydoc output.
+    False = False
+
+try:
+    True
+except NameError:
+    # Pre-2.2 Python has no True keyword.
+    __builtin__.True = not 0
+    # Assign to True in this module namespace so it shows up in pydoc output.
+    True = True
+
+try:
+    file
+except NameError:
+    # Pre-2.2 Python has no file() function.
+    __builtin__.file = open
+
+#
+try:
+    zip
+except NameError:
+    # Pre-2.2 Python has no zip() function.
+    def zip(*lists):
+        """
+        Emulates the behavior we need from the built-in zip() function
+        added in Python 2.2.
+
+        Returns a list of tuples, where each tuple contains the i-th
+        element rom each of the argument sequences.  The returned
+        list is truncated in length to the length of the shortest
+        argument sequence.
+        """
+        result = []
+        for i in xrange(min(map(len, lists))):
+            result.append(tuple(map(lambda l, i=i: l[i], lists)))
+        return result
+    __builtin__.zip = zip
+
+
+
+#if sys.version_info[:3] in ((2, 2, 0), (2, 2, 1)):
+#    def lstrip(s, c=string.whitespace):
+#        while s and s[0] in c:
+#            s = s[1:]
+#        return s
+#    def rstrip(s, c=string.whitespace):
+#        while s and s[-1] in c:
+#            s = s[:-1]
+#        return s
+#    def strip(s, c=string.whitespace, l=lstrip, r=rstrip):
+#        return l(r(s, c), c)
+#
+#    object.__setattr__(str, 'lstrip', lstrip)
+#    object.__setattr__(str, 'rstrip', rstrip)
+#    object.__setattr__(str, 'strip', strip)
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: