You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
282 lines
8.9 KiB
Cython
282 lines
8.9 KiB
Cython
# module-level API for namespace implementations
|
|
|
|
cdef class LxmlRegistryError(LxmlError):
|
|
"""Base class of lxml registry errors.
|
|
"""
|
|
|
|
cdef class NamespaceRegistryError(LxmlRegistryError):
|
|
"""Error registering a namespace extension.
|
|
"""
|
|
|
|
|
|
@cython.internal
|
|
cdef class _NamespaceRegistry:
|
|
u"Dictionary-like namespace registry"
|
|
cdef object _ns_uri
|
|
cdef bytes _ns_uri_utf
|
|
cdef dict _entries
|
|
cdef char* _c_ns_uri_utf
|
|
def __cinit__(self, ns_uri):
|
|
self._ns_uri = ns_uri
|
|
if ns_uri is None:
|
|
self._ns_uri_utf = None
|
|
self._c_ns_uri_utf = NULL
|
|
else:
|
|
self._ns_uri_utf = _utf8(ns_uri)
|
|
self._c_ns_uri_utf = _cstr(self._ns_uri_utf)
|
|
self._entries = {}
|
|
|
|
def update(self, class_dict_iterable):
|
|
u"""update(self, class_dict_iterable)
|
|
|
|
Forgivingly update the registry.
|
|
|
|
``class_dict_iterable`` may be a dict or some other iterable
|
|
that yields (name, value) pairs.
|
|
|
|
If a value does not match the required type for this registry,
|
|
or if the name starts with '_', it will be silently discarded.
|
|
This allows registrations at the module or class level using
|
|
vars(), globals() etc."""
|
|
if hasattr(class_dict_iterable, u'items'):
|
|
class_dict_iterable = class_dict_iterable.items()
|
|
for name, item in class_dict_iterable:
|
|
if (name is None or name[:1] != '_') and callable(item):
|
|
self[name] = item
|
|
|
|
def __getitem__(self, name):
|
|
if name is not None:
|
|
name = _utf8(name)
|
|
return self._get(name)
|
|
|
|
def __delitem__(self, name):
|
|
if name is not None:
|
|
name = _utf8(name)
|
|
del self._entries[name]
|
|
|
|
cdef object _get(self, object name):
|
|
cdef python.PyObject* dict_result
|
|
dict_result = python.PyDict_GetItem(self._entries, name)
|
|
if dict_result is NULL:
|
|
raise KeyError, u"Name not registered."
|
|
return <object>dict_result
|
|
|
|
cdef object _getForString(self, char* name):
|
|
cdef python.PyObject* dict_result
|
|
dict_result = python.PyDict_GetItem(self._entries, name)
|
|
if dict_result is NULL:
|
|
raise KeyError, u"Name not registered."
|
|
return <object>dict_result
|
|
|
|
def __iter__(self):
|
|
return iter(self._entries)
|
|
|
|
def items(self):
|
|
return list(self._entries.items())
|
|
|
|
def iteritems(self):
|
|
return iter(self._entries.items())
|
|
|
|
def clear(self):
|
|
self._entries.clear()
|
|
|
|
def __call__(self, obj):
|
|
# Usage as decorator:
|
|
# ns = lookup.get_namespace("...")
|
|
# @ns('abc')
|
|
# class element(ElementBase): pass
|
|
#
|
|
# @ns
|
|
# class elementname(ElementBase): pass
|
|
|
|
if obj is None or python._isString(obj):
|
|
# @ns(None) or @ns('tag')
|
|
return partial(self.__deco, obj)
|
|
# plain @ns decorator
|
|
self[obj.__name__] = obj
|
|
return obj
|
|
|
|
def __deco(self, name, obj):
|
|
self[name] = obj
|
|
return obj
|
|
|
|
|
|
@cython.final
|
|
@cython.internal
|
|
cdef class _ClassNamespaceRegistry(_NamespaceRegistry):
|
|
u"Dictionary-like registry for namespace implementation classes"
|
|
def __setitem__(self, name, item):
|
|
if not isinstance(item, type) or not issubclass(item, ElementBase):
|
|
raise NamespaceRegistryError, \
|
|
u"Registered element classes must be subtypes of ElementBase"
|
|
if name is not None:
|
|
name = _utf8(name)
|
|
self._entries[name] = item
|
|
|
|
def __repr__(self):
|
|
return u"Namespace(%r)" % self._ns_uri
|
|
|
|
|
|
cdef class ElementNamespaceClassLookup(FallbackElementClassLookup):
|
|
u"""ElementNamespaceClassLookup(self, fallback=None)
|
|
|
|
Element class lookup scheme that searches the Element class in the
|
|
Namespace registry.
|
|
|
|
Usage:
|
|
|
|
>>> lookup = ElementNamespaceClassLookup()
|
|
>>> ns_elements = lookup.get_namespace("http://schema.org/Movie")
|
|
|
|
>>> @ns_elements
|
|
... class movie(ElementBase):
|
|
... "Element implementation for 'movie' tag (using class name) in schema namespace."
|
|
|
|
>>> @ns_elements("movie")
|
|
... class MovieElement(ElementBase):
|
|
... "Element implementation for 'movie' tag (explicit tag name) in schema namespace."
|
|
"""
|
|
cdef dict _namespace_registries
|
|
def __cinit__(self):
|
|
self._namespace_registries = {}
|
|
|
|
def __init__(self, ElementClassLookup fallback=None):
|
|
FallbackElementClassLookup.__init__(self, fallback)
|
|
self._lookup_function = _find_nselement_class
|
|
|
|
def get_namespace(self, ns_uri):
|
|
u"""get_namespace(self, ns_uri)
|
|
|
|
Retrieve the namespace object associated with the given URI.
|
|
Pass None for the empty namespace.
|
|
|
|
Creates a new namespace object if it does not yet exist."""
|
|
if ns_uri:
|
|
ns_utf = _utf8(ns_uri)
|
|
else:
|
|
ns_utf = None
|
|
try:
|
|
return self._namespace_registries[ns_utf]
|
|
except KeyError:
|
|
registry = self._namespace_registries[ns_utf] = \
|
|
_ClassNamespaceRegistry(ns_uri)
|
|
return registry
|
|
|
|
cdef object _find_nselement_class(state, _Document doc, xmlNode* c_node):
|
|
cdef python.PyObject* dict_result
|
|
cdef ElementNamespaceClassLookup lookup
|
|
cdef _NamespaceRegistry registry
|
|
if state is None:
|
|
return _lookupDefaultElementClass(None, doc, c_node)
|
|
|
|
lookup = <ElementNamespaceClassLookup>state
|
|
if c_node.type != tree.XML_ELEMENT_NODE:
|
|
return _callLookupFallback(lookup, doc, c_node)
|
|
|
|
c_namespace_utf = _getNs(c_node)
|
|
if c_namespace_utf is not NULL:
|
|
dict_result = python.PyDict_GetItem(
|
|
lookup._namespace_registries, <unsigned char*>c_namespace_utf)
|
|
else:
|
|
dict_result = python.PyDict_GetItem(
|
|
lookup._namespace_registries, None)
|
|
if dict_result is not NULL:
|
|
registry = <_NamespaceRegistry>dict_result
|
|
classes = registry._entries
|
|
|
|
if c_node.name is not NULL:
|
|
dict_result = python.PyDict_GetItem(
|
|
classes, <unsigned char*>c_node.name)
|
|
else:
|
|
dict_result = NULL
|
|
|
|
if dict_result is NULL:
|
|
dict_result = python.PyDict_GetItem(classes, None)
|
|
|
|
if dict_result is not NULL:
|
|
return <object>dict_result
|
|
return _callLookupFallback(lookup, doc, c_node)
|
|
|
|
|
|
################################################################################
|
|
# XPath extension functions
|
|
|
|
cdef dict __FUNCTION_NAMESPACE_REGISTRIES
|
|
__FUNCTION_NAMESPACE_REGISTRIES = {}
|
|
|
|
def FunctionNamespace(ns_uri):
|
|
u"""FunctionNamespace(ns_uri)
|
|
|
|
Retrieve the function namespace object associated with the given
|
|
URI.
|
|
|
|
Creates a new one if it does not yet exist. A function namespace
|
|
can only be used to register extension functions.
|
|
|
|
Usage:
|
|
|
|
>>> ns_functions = FunctionNamespace("http://schema.org/Movie")
|
|
|
|
>>> @ns_functions # uses function name
|
|
... def add2(x):
|
|
... return x + 2
|
|
|
|
>>> @ns_functions("add3") # uses explicit name
|
|
... def add_three(x):
|
|
... return x + 3
|
|
"""
|
|
ns_utf = _utf8(ns_uri) if ns_uri else None
|
|
try:
|
|
return __FUNCTION_NAMESPACE_REGISTRIES[ns_utf]
|
|
except KeyError:
|
|
registry = __FUNCTION_NAMESPACE_REGISTRIES[ns_utf] = \
|
|
_XPathFunctionNamespaceRegistry(ns_uri)
|
|
return registry
|
|
|
|
@cython.internal
|
|
cdef class _FunctionNamespaceRegistry(_NamespaceRegistry):
|
|
def __setitem__(self, name, item):
|
|
if not callable(item):
|
|
raise NamespaceRegistryError, \
|
|
u"Registered functions must be callable."
|
|
if not name:
|
|
raise ValueError, \
|
|
u"extensions must have non empty names"
|
|
self._entries[_utf8(name)] = item
|
|
|
|
def __repr__(self):
|
|
return u"FunctionNamespace(%r)" % self._ns_uri
|
|
|
|
@cython.final
|
|
@cython.internal
|
|
cdef class _XPathFunctionNamespaceRegistry(_FunctionNamespaceRegistry):
|
|
cdef object _prefix
|
|
cdef bytes _prefix_utf
|
|
|
|
property prefix:
|
|
u"Namespace prefix for extension functions."
|
|
def __del__(self):
|
|
self._prefix = None # no prefix configured
|
|
self._prefix_utf = None
|
|
def __get__(self):
|
|
if self._prefix is None:
|
|
return ''
|
|
else:
|
|
return self._prefix
|
|
def __set__(self, prefix):
|
|
if prefix == '':
|
|
prefix = None # empty prefix
|
|
self._prefix_utf = _utf8(prefix) if prefix is not None else None
|
|
self._prefix = prefix
|
|
|
|
cdef list _find_all_extension_prefixes():
|
|
u"Internal lookup function to find all function prefixes for XSLT/XPath."
|
|
cdef _XPathFunctionNamespaceRegistry registry
|
|
cdef list ns_prefixes = []
|
|
for registry in __FUNCTION_NAMESPACE_REGISTRIES.itervalues():
|
|
if registry._prefix_utf is not None:
|
|
if registry._ns_uri_utf is not None:
|
|
ns_prefixes.append(
|
|
(registry._prefix_utf, registry._ns_uri_utf))
|
|
return ns_prefixes
|