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Diffstat (limited to 'src/engine/SCons/compat/builtins.py')
| -rw-r--r-- | src/engine/SCons/compat/builtins.py | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/src/engine/SCons/compat/builtins.py b/src/engine/SCons/compat/builtins.py new file mode 100644 index 0000000..a79b2ad --- /dev/null +++ b/src/engine/SCons/compat/builtins.py @@ -0,0 +1,187 @@ +# +# 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: |