Gestionnaire de fichiers - Editer - /usr/lib/python2.7/site-packages/slip/dbus/introspection.py
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#!/usr/bin/python # -*- coding: utf-8 -*- """Classes and functions to easily access DBus introspection data.""" from xml.etree.ElementTree import ElementTree from StringIO import StringIO class IElemMeta(type): """Metaclass for introspection elements. Sets elemname class member automatically from class name if not set explicitly. Registers classes for their element names.""" elemnames_to_classes = {} @classmethod def clsname_to_elemname(cls, clsname): elemname = "" for c in clsname: c_lower = c.lower() if c_lower != c: if len(elemname): elemname += "_" elemname += c_lower return elemname def __new__(cls, name, bases, dct): if name == "IElem": return type.__new__(cls, name, bases, dct) if 'elemname' not in dct: if not name.startswith("IElem"): raise TypeError("Class '%s' needs to set elemname (or be " "called 'IElem...'))" % name) dct['elemname'] = IElemMeta.clsname_to_elemname(name[5:]) elemname = dct['elemname'] if elemname in IElemMeta.elemnames_to_classes: raise TypeError("Class '%s' tries to register duplicate elemname " "'%s'" % (name, elemname)) kls = type.__new__(cls, name, bases, dct) IElemMeta.elemnames_to_classes[elemname] = kls return kls class IElem(object): """Base class for introspection elements.""" __metaclass__ = IElemMeta def __new__(cls, elem, parent=None): kls = IElemMeta.elemnames_to_classes.get(elem.tag, IElemMeta.elemnames_to_classes[None]) return super(IElem, cls).__new__(kls, elem, parent) def __init__(self, elem, parent=None): self.elem = elem self.parent = parent self.child_elements = [ IElem(c, parent=self) for c in elem ] def __str__(self): s = "%s %r" % (self.elemname if self.elemname else "unknown:%s" % self.elem.tag, self.attrib) for c in self.child_elements: for cc in str(c).split("\n"): s+="\n %s" % (cc) return s @property def attrib(self): return self.elem.attrib class IElemUnknown(IElem): """Catch-all for unknown introspection elements.""" elemname = None class IElemNameMixin(object): """Mixin for introspection elements with names.""" @property def name(self): return self.attrib['name'] class IElemNode(IElem, IElemNameMixin): """Introspection node.""" def __init__(self, elem, parent=None): super(IElemNode, self).__init__(elem, parent) self.child_nodes = [ c for c in self.child_elements if isinstance(c, IElemNode) ] class IElemInterface(IElem): """Introspection interface.""" class IElemMethod(IElem): """Introspection interface method.""" class IElemArg(IElem): """Introspection method argument.""" class IElemSignal(IElem, IElemNameMixin): """Introspection interface signal.""" def introspect(string_or_file): tree = ElementTree() # assume string if read() method doesn't exist, works for string, unicode, # dbus.String if not hasattr(string_or_file, "read"): string_or_file = StringIO(string_or_file) xml_root = tree.parse(string_or_file) elem_root = IElem(xml_root) return elem_root
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