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The |NamedType| object represents a single name and ASN.1 type of a constructed ASN.1 type. |NamedType| objects are immutable and duck-type Python :class:`tuple` objects holding *name* and *asn1Object* components. Parameters ---------- name: :py:class:`str` Field name asn1Object: ASN.1 type object """ isOptional = False isDefaulted = False def __init__(self, name, asn1Object, openType=None): self.__name = name self.__type = asn1Object self.__nameAndType = name, asn1Object self.__openType = openType def __repr__(self): representation = '%s=%r' % (self.name, self.asn1Object) if self.openType: representation += ' openType: %r' % self.openType return '<%s object at 0x%x type %s>' % (self.__class__.__name__, id(self), representation) def __eq__(self, other): return self.__nameAndType == other def __ne__(self, other): return self.__nameAndType != other def __lt__(self, other): return self.__nameAndType < other def __le__(self, other): return self.__nameAndType <= other def __gt__(self, other): return self.__nameAndType > other def __ge__(self, other): return self.__nameAndType >= other def __hash__(self): return hash(self.__nameAndType) def __getitem__(self, idx): return self.__nameAndType[idx] def __iter__(self): return iter(self.__nameAndType) @property def name(self): return self.__name @property def asn1Object(self): return self.__type @property def openType(self): return self.__openType # Backward compatibility def getName(self): return self.name def getType(self): return self.asn1Object class OptionalNamedType(NamedType): __doc__ = NamedType.__doc__ isOptional = True class DefaultedNamedType(NamedType): __doc__ = NamedType.__doc__ isDefaulted = True class NamedTypes(object): """Create a collection of named fields for a constructed ASN.1 type. The NamedTypes object represents a collection of named fields of a constructed ASN.1 type. *NamedTypes* objects are immutable and duck-type Python :class:`dict` objects holding *name* as keys and ASN.1 type object as values. Parameters ---------- *namedTypes: :class:`~pyasn1.type.namedtype.NamedType` Examples -------- .. code-block:: python class Description(Sequence): ''' ASN.1 specification: Description ::= SEQUENCE { surname IA5String, first-name IA5String OPTIONAL, age INTEGER DEFAULT 40 } ''' componentType = NamedTypes( NamedType('surname', IA5String()), OptionalNamedType('first-name', IA5String()), DefaultedNamedType('age', Integer(40)) ) descr = Description() descr['surname'] = 'Smith' descr['first-name'] = 'John' """ def __init__(self, *namedTypes, **kwargs): self.__namedTypes = namedTypes self.__namedTypesLen = len(self.__namedTypes) self.__minTagSet = self.__computeMinTagSet() self.__nameToPosMap = self.__computeNameToPosMap() self.__tagToPosMap = self.__computeTagToPosMap() self.__ambiguousTypes = 'terminal' not in kwargs and self.__computeAmbiguousTypes() or {} self.__uniqueTagMap = self.__computeTagMaps(unique=True) self.__nonUniqueTagMap = self.__computeTagMaps(unique=False) self.__hasOptionalOrDefault = any([True for namedType in self.__namedTypes if namedType.isDefaulted or namedType.isOptional]) self.__hasOpenTypes = any([True for namedType in self.__namedTypes if namedType.openType]) self.__requiredComponents = frozenset( [idx for idx, nt in enumerate(self.__namedTypes) if not nt.isOptional and not nt.isDefaulted] ) self.__keys = frozenset([namedType.name for namedType in self.__namedTypes]) self.__values = tuple([namedType.asn1Object for namedType in self.__namedTypes]) self.__items = tuple([(namedType.name, namedType.asn1Object) for namedType in self.__namedTypes]) def __repr__(self): representation = ', '.join(['%r' % x for x in self.__namedTypes]) return '<%s object at 0x%x types %s>' % (self.__class__.__name__, id(self), representation) def __eq__(self, other): return self.__namedTypes == other def __ne__(self, other): return self.__namedTypes != other def __lt__(self, other): return self.__namedTypes < other def __le__(self, other): return self.__namedTypes <= other def __gt__(self, other): return self.__namedTypes > other def __ge__(self, other): return self.__namedTypes >= other def __hash__(self): return hash(self.__namedTypes) def __getitem__(self, idx): try: return self.__namedTypes[idx] except TypeError: return self.__namedTypes[self.__nameToPosMap[idx]] def __contains__(self, key): return key in self.__nameToPosMap def __iter__(self): return (x[0] for x in self.__namedTypes) if sys.version_info[0] <= 2: def __nonzero__(self): return self.__namedTypesLen > 0 else: def __bool__(self): return self.__namedTypesLen > 0 def __len__(self): return self.__namedTypesLen # Python dict protocol def values(self): return self.__values def keys(self): return self.__keys def items(self): return self.__items def clone(self): return self.__class__(*self.__namedTypes) class PostponedError(object): def __init__(self, errorMsg): self.__errorMsg = errorMsg def __getitem__(self, item): raise error.PyAsn1Error(self.__errorMsg) def __computeTagToPosMap(self): tagToPosMap = {} for idx, namedType in enumerate(self.__namedTypes): tagMap = namedType.asn1Object.tagMap if isinstance(tagMap, NamedTypes.PostponedError): return tagMap if not tagMap: continue for _tagSet in tagMap.presentTypes: if _tagSet in tagToPosMap: return NamedTypes.PostponedError('Duplicate component tag %s at %s' % (_tagSet, namedType)) tagToPosMap[_tagSet] = idx return tagToPosMap def __computeNameToPosMap(self): nameToPosMap = {} for idx, namedType in enumerate(self.__namedTypes): if namedType.name in nameToPosMap: return NamedTypes.PostponedError('Duplicate component name %s at %s' % (namedType.name, namedType)) nameToPosMap[namedType.name] = idx return nameToPosMap def __computeAmbiguousTypes(self): ambigiousTypes = {} partialAmbigiousTypes = () for idx, namedType in reversed(tuple(enumerate(self.__namedTypes))): if namedType.isOptional or namedType.isDefaulted: partialAmbigiousTypes = (namedType,) + partialAmbigiousTypes else: partialAmbigiousTypes = (namedType,) if len(partialAmbigiousTypes) == len(self.__namedTypes): ambigiousTypes[idx] = self else: ambigiousTypes[idx] = NamedTypes(*partialAmbigiousTypes, **dict(terminal=True)) return ambigiousTypes def getTypeByPosition(self, idx): """Return ASN.1 type object by its position in fields set. Parameters ---------- idx: :py:class:`int` Field index Returns ------- : ASN.1 type Raises ------ : :class:`~pyasn1.error.PyAsn1Error` If given position is out of fields range """ try: return self.__namedTypes[idx].asn1Object except IndexError: raise error.PyAsn1Error('Type position out of range') def getPositionByType(self, tagSet): """Return field position by its ASN.1 type. Parameters ---------- tagSet: :class:`~pysnmp.type.tag.TagSet` ASN.1 tag set distinguishing one ASN.1 type from others. Returns ------- : :py:class:`int` ASN.1 type position in fields set Raises ------ : :class:`~pyasn1.error.PyAsn1Error` If *tagSet* is not present or ASN.1 types are not unique within callee *NamedTypes* """ try: return self.__tagToPosMap[tagSet] except KeyError: raise error.PyAsn1Error('Type %s not found' % (tagSet,)) def getNameByPosition(self, idx): """Return field name by its position in fields set. Parameters ---------- idx: :py:class:`idx` Field index Returns ------- : :py:class:`str` Field name Raises ------ : :class:`~pyasn1.error.PyAsn1Error` If given field name is not present in callee *NamedTypes* """ try: return self.__namedTypes[idx].name except IndexError: raise error.PyAsn1Error('Type position out of range') def getPositionByName(self, name): """Return field position by filed name. Parameters ---------- name: :py:class:`str` Field name Returns ------- : :py:class:`int` Field position in fields set Raises ------ : :class:`~pyasn1.error.PyAsn1Error` If *name* is not present or not unique within callee *NamedTypes* """ try: return self.__nameToPosMap[name] except KeyError: raise error.PyAsn1Error('Name %s not found' % (name,)) def getTagMapNearPosition(self, idx): """Return ASN.1 types that are allowed at or past given field position. Some ASN.1 serialisation allow for skipping optional and defaulted fields. Some constructed ASN.1 types allow reordering of the fields. When recovering such objects it may be important to know which types can possibly be present at any given position in the field sets. Parameters ---------- idx: :py:class:`int` Field index Returns ------- : :class:`~pyasn1.type.tagmap.TagMap` Map if ASN.1 types allowed at given field position Raises ------ : :class:`~pyasn1.error.PyAsn1Error` If given position is out of fields range """ try: return self.__ambiguousTypes[idx].tagMap except KeyError: raise error.PyAsn1Error('Type position out of range') def getPositionNearType(self, tagSet, idx): """Return the closest field position where given ASN.1 type is allowed. Some ASN.1 serialisation allow for skipping optional and defaulted fields. Some constructed ASN.1 types allow reordering of the fields. When recovering such objects it may be important to know at which field position, in field set, given *tagSet* is allowed at or past *idx* position. Parameters ---------- tagSet: :class:`~pyasn1.type.tag.TagSet` ASN.1 type which field position to look up idx: :py:class:`int` Field position at or past which to perform ASN.1 type look up Returns ------- : :py:class:`int` Field position in fields set Raises ------ : :class:`~pyasn1.error.PyAsn1Error` If *tagSet* is not present or not unique within callee *NamedTypes* or *idx* is out of fields range """ try: return idx + self.__ambiguousTypes[idx].getPositionByType(tagSet) except KeyError: raise error.PyAsn1Error('Type position out of range') def __computeMinTagSet(self): minTagSet = None for namedType in self.__namedTypes: asn1Object = namedType.asn1Object try: tagSet = asn1Object.minTagSet except AttributeError: tagSet = asn1Object.tagSet if minTagSet is None or tagSet < minTagSet: minTagSet = tagSet return minTagSet or tag.TagSet() @property def minTagSet(self): """Return the minimal TagSet among ASN.1 type in callee *NamedTypes*. Some ASN.1 types/serialisation protocols require ASN.1 types to be arranged based on their numerical tag value. The *minTagSet* property returns that. Returns ------- : :class:`~pyasn1.type.tagset.TagSet` Minimal TagSet among ASN.1 types in callee *NamedTypes* """ return self.__minTagSet def __computeTagMaps(self, unique): presentTypes = {} skipTypes = {} defaultType = None for namedType in self.__namedTypes: tagMap = namedType.asn1Object.tagMap if isinstance(tagMap, NamedTypes.PostponedError): return tagMap for tagSet in tagMap: if unique and tagSet in presentTypes: return NamedTypes.PostponedError('Non-unique tagSet %s of %s at %s' % (tagSet, namedType, self)) presentTypes[tagSet] = namedType.asn1Object skipTypes.update(tagMap.skipTypes) if defaultType is None: defaultType = tagMap.defaultType elif tagMap.defaultType is not None: return NamedTypes.PostponedError('Duplicate default ASN.1 type at %s' % (self,)) return tagmap.TagMap(presentTypes, skipTypes, defaultType) @property def tagMap(self): """Return a *TagMap* object from tags and types recursively. Return a :class:`~pyasn1.type.tagmap.TagMap` object by combining tags from *TagMap* objects of children types and associating them with their immediate child type. Example ------- .. code-block:: python OuterType ::= CHOICE { innerType INTEGER } Calling *.tagMap* on *OuterType* will yield a map like this: .. code-block:: python Integer.tagSet -> Choice """ return self.__nonUniqueTagMap @property def tagMapUnique(self): """Return a *TagMap* object from unique tags and types recursively. Return a :class:`~pyasn1.type.tagmap.TagMap` object by combining tags from *TagMap* objects of children types and associating them with their immediate child type. Example ------- .. code-block:: python OuterType ::= CHOICE { innerType INTEGER } Calling *.tagMapUnique* on *OuterType* will yield a map like this: .. code-block:: python Integer.tagSet -> Choice Note ---- Duplicate *TagSet* objects found in the tree of children types would cause error. """ return self.__uniqueTagMap @property def hasOptionalOrDefault(self): return self.__hasOptionalOrDefault @property def hasOpenTypes(self): return self.__hasOpenTypes @property def namedTypes(self): return tuple(self.__namedTypes) @property def requiredComponents(self): return self.__requiredComponents