4 # Permission is hereby granted, free of charge, to any person obtaining
5 # a copy of this software and associated documentation files (the
6 # "Software"), to deal in the Software without restriction, including
7 # without limitation the rights to use, copy, modify, merge, publish,
8 # distribute, sublicense, and/or sell copies of the Software, and to
9 # permit persons to whom the Software is furnished to do so, subject to
10 # the following conditions:
12 # The above copyright notice and this permission notice shall be included
13 # in all copies or substantial portions of the Software.
15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
16 # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
17 # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
19 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
20 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
21 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 SCons compatibility package for old Python versions
27 This subpackage holds modules that provide backwards-compatible
28 implementations of various things that we'd like to use in SCons but which
29 only show up in later versions of Python than the early, old version(s)
32 Other code will not generally reference things in this package through
33 the SCons.compat namespace. The modules included here add things to
34 the __builtin__ namespace or the global module list so that the rest
35 of our code can use the objects and names imported here regardless of
38 Simply enough, things that go in the __builtin__ name space come from
41 The rest of the things here will be in individual compatibility modules
42 that are either: 1) suitably modified copies of the future modules that
43 we want to use; or 2) backwards compatible re-implementations of the
44 specific portions of a future module's API that we want to use.
46 GENERAL WARNINGS: Implementations of functions in the SCons.compat
47 modules are *NOT* guaranteed to be fully compliant with these functions in
48 later versions of Python. We are only concerned with adding functionality
49 that we actually use in SCons, so be wary if you lift this code for
50 other uses. (That said, making these more nearly the same as later,
51 official versions is still a desirable goal, we just don't need to be
54 We name the compatibility modules with an initial '_scons_' (for example,
55 _scons_subprocess.py is our compatibility module for subprocess) so
56 that we can still try to import the real module name and fall back to
57 our compatibility module if we get an ImportError. The import_as()
58 function defined below loads the module as the "real" name (without the
59 '_scons'), after which all of the "import {module}" statements in the
60 rest of our code will find our pre-loaded compatibility module.
63 __revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
65 def import_as(module, name):
67 Imports the specified module (from our local directory) as the
72 dir = os.path.split(__file__)[0]
73 file, filename, suffix_mode_type = imp.find_module(module, [dir])
74 imp.load_module(name, file, filename, suffix_mode_type)
81 # Pre-2.5 Python has no hashlib module.
83 import_as('_scons_hashlib', 'hashlib')
85 # If we failed importing our compatibility module, it probably
86 # means this version of Python has no md5 module. Don't do
87 # anything and let the higher layer discover this fact, so it
88 # can fall back to using timestamp.
94 # Pre-2.4 Python has no native set type
95 import_as('_scons_sets', 'sets')
96 import __builtin__, sets
97 __builtin__.set = sets.Set
103 # Pre-2.4 Python has no collections module.
104 import_as('_scons_collections', 'collections')
108 except AttributeError:
110 collections.UserDict = UserDict.UserDict
114 except AttributeError:
116 collections.UserList = UserList.UserList
119 collections.UserString
120 except AttributeError:
122 collections.UserString = UserString.UserString
129 except AttributeError:
130 # Pre-2.2 Python has no fnmatch.filter() function.
131 def filter(names, pat):
132 """Return the subset of the list NAMES that match PAT"""
135 pat = os.path.normcase(pat)
136 if pat not in fnmatch._cache:
138 res = fnmatch.translate(pat)
139 fnmatch._cache[pat] = re.compile(res)
140 match = fnmatch._cache[pat].match
141 if os.path is posixpath:
142 # normcase on posix is NOP. Optimize it away from the loop.
148 if match(os.path.normcase(name)):
151 fnmatch.filter = filter
157 # Pre-2.6 Python has no io module.
158 import_as('_scons_io', 'io')
163 # Pre-2.3 Python has no itertools module.
164 import_as('_scons_itertools', 'itertools')
166 # If we need the compatibility version of textwrap, it must be imported
167 # before optparse, which uses it.
171 # Pre-2.3 Python has no textwrap module.
172 import_as('_scons_textwrap', 'textwrap')
177 # Pre-2.3 Python has no optparse module.
178 import_as('_scons_optparse', 'optparse')
183 except AttributeError:
184 # Pre-2.4 Python has no os.devnull attribute
186 _names = sys.builtin_module_names
187 if 'posix' in _names:
188 os.devnull = '/dev/null'
191 os.path.devnull = os.devnull
194 except AttributeError:
195 # Pre-2.4 Python has no os.path.lexists function
197 return os.path.exists(path) or os.path.islink(path)
198 os.path.lexists = lexists
202 # Use the "imp" module to protect the import from fixers.
204 cPickle = imp.load_module('cPickle', *imp.find_module('cPickle'))
205 except ImportError, e:
206 # The "cPickle" module has already been eliminated in favor of
207 # having "import pickle" import the fast version when available.
211 sys.modules['pickle'] = cPickle
216 # Use the "imp" module to protect the import from fixers.
218 cProfile = imp.load_module('cProfile', *imp.find_module('cProfile'))
220 # The "cProfile" module has already been eliminated in favor of
221 # having "import profile" import the fast version when available.
225 sys.modules['profile'] = cProfile
232 # Pre-2.3 Python has no platform module.
233 import_as('_scons_platform', 'platform')
239 # Before Python 3.0, the 'queue' module was named 'Queue'.
241 file, filename, suffix_mode_type = imp.find_module('Queue')
242 imp.load_module('queue', file, filename, suffix_mode_type)
248 except AttributeError:
249 # Pre-2.3 Python has no shlex.split() function.
251 # The full white-space splitting semantics of shlex.split() are
252 # complicated to reproduce by hand, so just use a compatibility
253 # version of the shlex module cribbed from Python 2.5 with some
254 # minor modifications for older Python versions.
256 import_as('_scons_shlex', 'shlex')
262 except AttributeError:
263 # Pre-2.3 Python has no shutil.move() function.
265 # Cribbed from Python 2.5.
269 """Recursively move a file or directory to another location.
271 If the destination is on our current filesystem, then simply use
272 rename. Otherwise, copy src to the dst and then remove src.
273 A lot more could be done here... A look at a mv.c shows a lot of
274 the issues this implementation glosses over.
280 if os.path.isdir(src):
281 if shutil.destinsrc(src, dst):
282 raise Error, "Cannot move a directory '%s' into itself '%s'." % (src, dst)
283 shutil.copytree(src, dst, symlinks=True)
286 shutil.copy2(src,dst)
291 def destinsrc(src, dst):
292 src = os.path.abspath(src)
293 return os.path.abspath(dst)[:len(src)] == src
294 shutil.destinsrc = destinsrc
301 # Pre-2.4 Python has no subprocess module.
302 import_as('_scons_subprocess', 'subprocess')
307 except AttributeError:
308 # Pre-2.6 Python has no sys.intern() function.
311 sys.intern = __builtin__.intern
312 except AttributeError:
313 # Pre-2.x Python has no builtin intern() function.
320 except AttributeError:
321 # Pre-2.6 Python has no sys.maxsize attribute
322 # Wrapping sys in () is silly, but protects it from 2to3 renames fixer
323 sys.maxsize = (sys).maxint
329 except AttributeError:
330 # Pre-2.3 Python has no tempfile.mkstemp function, so try to simulate it.
331 # adapted from the mkstemp implementation in python 3.
334 def mkstemp(*args, **kw):
338 if 'text' in kw.keys() :
341 elif len( args ) == 4 :
344 flags = os.O_RDWR | os.O_CREAT | os.O_EXCL
345 if not text and hasattr( os, 'O_BINARY' ) :
346 flags = flags | os.O_BINARY
349 name = tempfile.mktemp(*args, **kw)
350 fd = os.open( name, flags, 0600 )
351 return (fd, os.path.abspath(name))
353 if e.errno == errno.EEXIST:
357 tempfile.mkstemp = mkstemp
361 # pre-2.7 doesn't have the memoryview() built-in
365 from types import SliceType
366 def __init__(self, obj):
367 # wrapping buffer in () keeps the fixer from changing it
368 self.obj = (buffer)(obj)
369 def __getitem__(self, indx):
370 if isinstance(indx, self.SliceType):
371 return self.obj[indx.start:indx.stop]
373 return self.obj[indx]
375 __builtin__.memoryview = memoryview
380 # indent-tabs-mode:nil
382 # vim: set expandtab tabstop=4 shiftwidth=4: