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xmlschema.pxi
# support for XMLSchema validation from lxml.includes cimport xmlschema cdef class XMLSchemaError(LxmlError): """Base class of all XML Schema errors """ cdef class XMLSchemaParseError(XMLSchemaError): """Error while parsing an XML document as XML Schema. """ cdef class XMLSchemaValidateError(XMLSchemaError): """Error while validating an XML document with an XML Schema. """ ################################################################################ # XMLSchema cdef XPath _check_for_default_attributes = XPath( u"boolean(//xs:attribute[@default or @fixed][1])", namespaces={u'xs': u'http://www.w3.org/2001/XMLSchema'}) cdef class XMLSchema(_Validator): u"""XMLSchema(self, etree=None, file=None) Turn a document into an XML Schema validator. Either pass a schema as Element or ElementTree, or pass a file or filename through the ``file`` keyword argument. Passing the ``attribute_defaults`` boolean option will make the schema insert default/fixed attributes into validated documents. """ cdef xmlschema.xmlSchema* _c_schema cdef _Document _doc cdef bint _has_default_attributes cdef bint _add_attribute_defaults def __cinit__(self): self._has_default_attributes = True # play it safe self._add_attribute_defaults = False def __init__(self, etree=None, *, file=None, bint attribute_defaults=False): cdef xmlschema.xmlSchemaParserCtxt* parser_ctxt cdef xmlDoc* c_doc self._add_attribute_defaults = attribute_defaults _Validator.__init__(self) c_doc = NULL if etree is not None: doc = _documentOrRaise(etree) root_node = _rootNodeOrRaise(etree) c_doc = _copyDocRoot(doc._c_doc, root_node._c_node) self._doc = _documentFactory(c_doc, doc._parser) parser_ctxt = xmlschema.xmlSchemaNewDocParserCtxt(c_doc) elif file is not None: file = _getFSPathOrObject(file) if _isString(file): filename = _encodeFilename(file) parser_ctxt = xmlschema.xmlSchemaNewParserCtxt(_cstr(filename)) else: self._doc = _parseDocument(file, None, None) parser_ctxt = xmlschema.xmlSchemaNewDocParserCtxt(self._doc._c_doc) else: raise XMLSchemaParseError, u"No tree or file given" if parser_ctxt is NULL: raise MemoryError() xmlschema.xmlSchemaSetParserStructuredErrors( parser_ctxt, _receiveError, <void*>self._error_log) if self._doc is not None: # calling xmlSchemaParse on a schema with imports or # includes will cause libxml2 to create an internal # context for parsing, so push an implied context to route # resolve requests to the document's parser __GLOBAL_PARSER_CONTEXT.pushImpliedContextFromParser(self._doc._parser) with nogil: orig_loader = _register_document_loader() self._c_schema = xmlschema.xmlSchemaParse(parser_ctxt) _reset_document_loader(orig_loader) if self._doc is not None: __GLOBAL_PARSER_CONTEXT.popImpliedContext() xmlschema.xmlSchemaFreeParserCtxt(parser_ctxt) if self._c_schema is NULL: raise XMLSchemaParseError( self._error_log._buildExceptionMessage( u"Document is not valid XML Schema"), self._error_log) if self._doc is not None: self._has_default_attributes = _check_for_default_attributes(self._doc) self._add_attribute_defaults = attribute_defaults and self._has_default_attributes def __dealloc__(self): xmlschema.xmlSchemaFree(self._c_schema) def __call__(self, etree): u"""__call__(self, etree) Validate doc using XML Schema. Returns true if document is valid, false if not. """ cdef xmlschema.xmlSchemaValidCtxt* valid_ctxt cdef _Document doc cdef _Element root_node cdef xmlDoc* c_doc cdef int ret assert self._c_schema is not NULL, "Schema instance not initialised" doc = _documentOrRaise(etree) root_node = _rootNodeOrRaise(etree) valid_ctxt = xmlschema.xmlSchemaNewValidCtxt(self._c_schema) if valid_ctxt is NULL: raise MemoryError() try: if self._add_attribute_defaults: xmlschema.xmlSchemaSetValidOptions( valid_ctxt, xmlschema.XML_SCHEMA_VAL_VC_I_CREATE) self._error_log.clear() xmlschema.xmlSchemaSetValidStructuredErrors( valid_ctxt, _receiveError, <void*>self._error_log) c_doc = _fakeRootDoc(doc._c_doc, root_node._c_node) with nogil: ret = xmlschema.xmlSchemaValidateDoc(valid_ctxt, c_doc) _destroyFakeDoc(doc._c_doc, c_doc) finally: xmlschema.xmlSchemaFreeValidCtxt(valid_ctxt) if ret == -1: raise XMLSchemaValidateError( u"Internal error in XML Schema validation.", self._error_log) if ret == 0: return True else: return False cdef _ParserSchemaValidationContext _newSaxValidator( self, bint add_default_attributes): cdef _ParserSchemaValidationContext context context = _ParserSchemaValidationContext.__new__(_ParserSchemaValidationContext) context._schema = self context._add_default_attributes = (self._has_default_attributes and ( add_default_attributes or self._add_attribute_defaults)) return context @cython.final @cython.internal cdef class _ParserSchemaValidationContext: cdef XMLSchema _schema cdef xmlschema.xmlSchemaValidCtxt* _valid_ctxt cdef xmlschema.xmlSchemaSAXPlugStruct* _sax_plug cdef bint _add_default_attributes def __cinit__(self): self._valid_ctxt = NULL self._sax_plug = NULL self._add_default_attributes = False def __dealloc__(self): self.disconnect() if self._valid_ctxt: xmlschema.xmlSchemaFreeValidCtxt(self._valid_ctxt) cdef _ParserSchemaValidationContext copy(self): assert self._schema is not None, "_ParserSchemaValidationContext not initialised" return self._schema._newSaxValidator( self._add_default_attributes) cdef void inject_default_attributes(self, xmlDoc* c_doc): # we currently need to insert default attributes manually # after parsing, as libxml2 does not support this at parse # time if self._add_default_attributes: with nogil: xmlschema.xmlSchemaValidateDoc(self._valid_ctxt, c_doc) cdef int connect(self, xmlparser.xmlParserCtxt* c_ctxt, _BaseErrorLog error_log) except -1: if self._valid_ctxt is NULL: self._valid_ctxt = xmlschema.xmlSchemaNewValidCtxt( self._schema._c_schema) if self._valid_ctxt is NULL: raise MemoryError() if self._add_default_attributes: xmlschema.xmlSchemaSetValidOptions( self._valid_ctxt, xmlschema.XML_SCHEMA_VAL_VC_I_CREATE) if error_log is not None: xmlschema.xmlSchemaSetValidStructuredErrors( self._valid_ctxt, _receiveError, <void*>error_log) self._sax_plug = xmlschema.xmlSchemaSAXPlug( self._valid_ctxt, &c_ctxt.sax, &c_ctxt.userData) cdef void disconnect(self): if self._sax_plug is not NULL: xmlschema.xmlSchemaSAXUnplug(self._sax_plug) self._sax_plug = NULL if self._valid_ctxt is not NULL: xmlschema.xmlSchemaSetValidStructuredErrors( self._valid_ctxt, NULL, NULL) cdef bint isvalid(self): if self._valid_ctxt is NULL: return 1 # valid return xmlschema.xmlSchemaIsValid(self._valid_ctxt)
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