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nsclasses.pxi

# 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

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