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 except AttributeError:
105 collections.UserDict = UserDict.UserDict
109 except AttributeError:
111 collections.UserList = UserList.UserList
114 collections.UserString
115 except AttributeError:
117 collections.UserString = UserString.UserString
124 except AttributeError:
125 # Pre-2.2 Python has no fnmatch.filter() function.
126 def filter(names, pat):
127 """Return the subset of the list NAMES that match PAT"""
130 pat = os.path.normcase(pat)
131 if pat not in fnmatch._cache:
133 res = fnmatch.translate(pat)
134 fnmatch._cache[pat] = re.compile(res)
135 match = fnmatch._cache[pat].match
136 if os.path is posixpath:
137 # normcase on posix is NOP. Optimize it away from the loop.
143 if match(os.path.normcase(name)):
146 fnmatch.filter = filter
152 # Pre-2.6 Python has no io module.
153 import_as('_scons_io', 'io')
158 # Pre-2.3 Python has no itertools module.
159 import_as('_scons_itertools', 'itertools')
161 # If we need the compatibility version of textwrap, it must be imported
162 # before optparse, which uses it.
166 # Pre-2.3 Python has no textwrap module.
167 import_as('_scons_textwrap', 'textwrap')
172 # Pre-2.3 Python has no optparse module.
173 import_as('_scons_optparse', 'optparse')
178 except AttributeError:
179 # Pre-2.4 Python has no os.devnull attribute
181 _names = sys.builtin_module_names
182 if 'posix' in _names:
183 os.devnull = '/dev/null'
186 os.path.devnull = os.devnull
189 except AttributeError:
190 # Pre-2.4 Python has no os.path.lexists function
192 return os.path.exists(path) or os.path.islink(path)
193 os.path.lexists = lexists
199 # Pre-2.3 Python has no platform module.
200 import_as('_scons_platform', 'platform')
206 # Before Python 3.0, the 'queue' module was named 'Queue'.
208 file, filename, suffix_mode_type = imp.find_module('Queue')
209 imp.load_module('queue', file, filename, suffix_mode_type)
215 except AttributeError:
216 # Pre-2.3 Python has no shlex.split() function.
218 # The full white-space splitting semantics of shlex.split() are
219 # complicated to reproduce by hand, so just use a compatibility
220 # version of the shlex module cribbed from Python 2.5 with some
221 # minor modifications for older Python versions.
223 import_as('_scons_shlex', 'shlex')
229 except AttributeError:
230 # Pre-2.3 Python has no shutil.move() function.
232 # Cribbed from Python 2.5.
236 """Recursively move a file or directory to another location.
238 If the destination is on our current filesystem, then simply use
239 rename. Otherwise, copy src to the dst and then remove src.
240 A lot more could be done here... A look at a mv.c shows a lot of
241 the issues this implementation glosses over.
247 if os.path.isdir(src):
248 if shutil.destinsrc(src, dst):
249 raise Error, "Cannot move a directory '%s' into itself '%s'." % (src, dst)
250 shutil.copytree(src, dst, symlinks=True)
253 shutil.copy2(src,dst)
258 def destinsrc(src, dst):
259 src = os.path.abspath(src)
260 return os.path.abspath(dst)[:len(src)] == src
261 shutil.destinsrc = destinsrc
268 # Pre-2.4 Python has no subprocess module.
269 import_as('_scons_subprocess', 'subprocess')
274 except AttributeError:
275 # Pre-2.6 Python has no sys.intern() function.
278 sys.intern = __builtin__.intern
279 except AttributeError:
280 # Pre-2.x Python has no builtin intern() function.
287 except AttributeError:
288 # Pre-2.6 Python has no sys.maxsize attribute
289 # Wrapping sys in () is silly, but protects it from 2to3 renames fixer
290 sys.maxsize = (sys).maxint
296 except AttributeError:
297 # Pre-2.3 Python has no tempfile.mkstemp function, so try to simulate it.
298 # adapted from the mkstemp implementation in python 3.
301 def mkstemp(*args, **kw):
305 if 'text' in kw.keys() :
308 elif len( args ) == 4 :
311 flags = os.O_RDWR | os.O_CREAT | os.O_EXCL
312 if not text and hasattr( os, 'O_BINARY' ) :
313 flags = flags | os.O_BINARY
316 name = tempfile.mktemp(*args, **kw)
317 fd = os.open( name, flags, 0600 )
318 return (fd, os.path.abspath(name))
320 if e.errno == errno.EEXIST:
324 tempfile.mkstemp = mkstemp
328 # pre-2.7 doesn't have the memoryview() built-in
332 from types import SliceType
333 def __init__(self, obj):
334 # wrapping buffer in () keeps the fixer from changing it
335 self.obj = (buffer)(obj)
336 def __getitem__(self, indx):
337 if isinstance(indx, self.SliceType):
338 return self.obj[indx.start:indx.stop]
340 return self.obj[indx]
342 __builtin__.memoryview = memoryview
347 # indent-tabs-mode:nil
349 # vim: set expandtab tabstop=4 shiftwidth=4: