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Diffstat (limited to 'setuptools/depends.py')
| -rw-r--r-- | setuptools/depends.py | 246 |
1 files changed, 0 insertions, 246 deletions
diff --git a/setuptools/depends.py b/setuptools/depends.py deleted file mode 100644 index 20e5cec..0000000 --- a/setuptools/depends.py +++ /dev/null @@ -1,246 +0,0 @@ -from __future__ import generators -import sys, imp, marshal -from imp import PKG_DIRECTORY, PY_COMPILED, PY_SOURCE, PY_FROZEN -from distutils.version import StrictVersion, LooseVersion - -__all__ = [ - 'Require', 'find_module', 'get_module_constant', 'extract_constant' -] - -class Require: - """A prerequisite to building or installing a distribution""" - - def __init__(self,name,requested_version,module,homepage='', - attribute=None,format=None - ): - - if format is None and requested_version is not None: - format = StrictVersion - - if format is not None: - requested_version = format(requested_version) - if attribute is None: - attribute = '__version__' - - self.__dict__.update(locals()) - del self.self - - - def full_name(self): - """Return full package/distribution name, w/version""" - if self.requested_version is not None: - return '%s-%s' % (self.name,self.requested_version) - return self.name - - - def version_ok(self,version): - """Is 'version' sufficiently up-to-date?""" - return self.attribute is None or self.format is None or \ - str(version)<>"unknown" and version >= self.requested_version - - - def get_version(self, paths=None, default="unknown"): - - """Get version number of installed module, 'None', or 'default' - - Search 'paths' for module. If not found, return 'None'. If found, - return the extracted version attribute, or 'default' if no version - attribute was specified, or the value cannot be determined without - importing the module. The version is formatted according to the - requirement's version format (if any), unless it is 'None' or the - supplied 'default'. - """ - - if self.attribute is None: - try: - f,p,i = find_module(self.module,paths) - if f: f.close() - return default - except ImportError: - return None - - v = get_module_constant(self.module,self.attribute,default,paths) - - if v is not None and v is not default and self.format is not None: - return self.format(v) - - return v - - - def is_present(self,paths=None): - """Return true if dependency is present on 'paths'""" - return self.get_version(paths) is not None - - - def is_current(self,paths=None): - """Return true if dependency is present and up-to-date on 'paths'""" - version = self.get_version(paths) - if version is None: - return False - return self.version_ok(version) - - -def _iter_code(code): - - """Yield '(op,arg)' pair for each operation in code object 'code'""" - - from array import array - from dis import HAVE_ARGUMENT, EXTENDED_ARG - - bytes = array('b',code.co_code) - eof = len(code.co_code) - - ptr = 0 - extended_arg = 0 - - while ptr<eof: - - op = bytes[ptr] - - if op>=HAVE_ARGUMENT: - - arg = bytes[ptr+1] + bytes[ptr+2]*256 + extended_arg - ptr += 3 - - if op==EXTENDED_ARG: - extended_arg = arg * 65536L - continue - - else: - arg = None - ptr += 1 - - yield op,arg - - - - - - - - - - -def find_module(module, paths=None): - """Just like 'imp.find_module()', but with package support""" - - parts = module.split('.') - - while parts: - part = parts.pop(0) - f, path, (suffix,mode,kind) = info = imp.find_module(part, paths) - - if kind==PKG_DIRECTORY: - parts = parts or ['__init__'] - paths = [path] - - elif parts: - raise ImportError("Can't find %r in %s" % (parts,module)) - - return info - - - - - - - - - - - - - - - - - - - - - - - - -def get_module_constant(module, symbol, default=-1, paths=None): - - """Find 'module' by searching 'paths', and extract 'symbol' - - Return 'None' if 'module' does not exist on 'paths', or it does not define - 'symbol'. If the module defines 'symbol' as a constant, return the - constant. Otherwise, return 'default'.""" - - try: - f, path, (suffix,mode,kind) = find_module(module,paths) - except ImportError: - # Module doesn't exist - return None - - try: - if kind==PY_COMPILED: - f.read(8) # skip magic & date - code = marshal.load(f) - elif kind==PY_FROZEN: - code = imp.get_frozen_object(module) - elif kind==PY_SOURCE: - code = compile(f.read(), path, 'exec') - else: - # Not something we can parse; we'll have to import it. :( - if module not in sys.modules: - imp.load_module(module,f,path,(suffix,mode,kind)) - return getattr(sys.modules[module],symbol,None) - - finally: - if f: - f.close() - - return extract_constant(code,symbol,default) - - - - - - - - -def extract_constant(code,symbol,default=-1): - - """Extract the constant value of 'symbol' from 'code' - - If the name 'symbol' is bound to a constant value by the Python code - object 'code', return that value. If 'symbol' is bound to an expression, - return 'default'. Otherwise, return 'None'. - - Return value is based on the first assignment to 'symbol'. 'symbol' must - be a global, or at least a non-"fast" local in the code block. That is, - only 'STORE_NAME' and 'STORE_GLOBAL' opcodes are checked, and 'symbol' - must be present in 'code.co_names'. - """ - - if symbol not in code.co_names: - # name's not there, can't possibly be an assigment - return None - - name_idx = list(code.co_names).index(symbol) - - STORE_NAME = 90 - STORE_GLOBAL = 97 - LOAD_CONST = 100 - - const = default - - for op, arg in _iter_code(code): - - if op==LOAD_CONST: - const = code.co_consts[arg] - elif arg==name_idx and (op==STORE_NAME or op==STORE_GLOBAL): - return const - else: - const = default - - - - - - - |