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A copy of the ZPL should accompany this distribution. # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS # FOR A PARTICULAR PURPOSE. # ############################################################################## """Verify interface implementations """ from zope.interface.exceptions import BrokenImplementation, DoesNotImplement from zope.interface.exceptions import BrokenMethodImplementation from types import FunctionType, MethodType from zope.interface.interface import fromMethod, fromFunction, Method import sys # This will be monkey-patched when running under Zope 2, so leave this # here: MethodTypes = (MethodType, ) def _verify(iface, candidate, tentative=0, vtype=None): """Verify that 'candidate' might correctly implements 'iface'. This involves: o Making sure the candidate defines all the necessary methods o Making sure the methods have the correct signature o Making sure the candidate asserts that it implements the interface Note that this isn't the same as verifying that the class does implement the interface. If optional tentative is true, suppress the "is implemented by" test. """ if vtype == 'c': tester = iface.implementedBy else: tester = iface.providedBy if not tentative and not tester(candidate): raise DoesNotImplement(iface) # Here the `desc` is either an `Attribute` or `Method` instance for name, desc in iface.namesAndDescriptions(1): try: attr = getattr(candidate, name) except AttributeError: if (not isinstance(desc, Method)) and vtype == 'c': # We can't verify non-methods on classes, since the # class may provide attrs in it's __init__. continue raise BrokenImplementation(iface, name) if not isinstance(desc, Method): # If it's not a method, there's nothing else we can test continue if isinstance(attr, FunctionType): if sys.version[0] == '3' and isinstance(candidate, type): # This is an "unbound method" in Python 3. meth = fromFunction(attr, iface, name=name, imlevel=1) #pragma NO COVERAGE else: # Nope, just a normal function meth = fromFunction(attr, iface, name=name) elif (isinstance(attr, MethodTypes) and type(attr.__func__) is FunctionType): meth = fromMethod(attr, iface, name) elif isinstance(attr, property) and vtype == 'c': # We without an instance we cannot be sure it's not a # callable. continue else: if not callable(attr): raise BrokenMethodImplementation(name, "Not a method") # sigh, it's callable, but we don't know how to introspect it, so # we have to give it a pass. continue #pragma NO COVERAGE # Make sure that the required and implemented method signatures are # the same. desc = desc.getSignatureInfo() meth = meth.getSignatureInfo() mess = _incompat(desc, meth) if mess: raise BrokenMethodImplementation(name, mess) return True def verifyClass(iface, candidate, tentative=0): return _verify(iface, candidate, tentative, vtype='c') def verifyObject(iface, candidate, tentative=0): return _verify(iface, candidate, tentative, vtype='o') def _incompat(required, implemented): #if (required['positional'] != # implemented['positional'][:len(required['positional'])] # and implemented['kwargs'] is None): # return 'imlementation has different argument names' if len(implemented['required']) > len(required['required']): return 'implementation requires too many arguments' if ((len(implemented['positional']) < len(required['positional'])) and not implemented['varargs']): return "implementation doesn't allow enough arguments" if required['kwargs'] and not implemented['kwargs']: return "implementation doesn't support keyword arguments" if required['varargs'] and not implemented['varargs']: return "implementation doesn't support variable arguments"