Edit File: parser.pxi
# Parsers for XML and HTML from lxml.includes cimport xmlparser from lxml.includes cimport htmlparser class ParseError(LxmlSyntaxError): """Syntax error while parsing an XML document. For compatibility with ElementTree 1.3 and later. """ def __init__(self, message, code, line, column, filename=None): super(_ParseError, self).__init__(message) self.lineno, self.offset = (line, column - 1) self.code = code self.filename = filename @property def position(self): return self.lineno, self.offset + 1 @position.setter def position(self, new_pos): self.lineno, column = new_pos self.offset = column - 1 cdef object _ParseError = ParseError class XMLSyntaxError(ParseError): """Syntax error while parsing an XML document. """ cdef class ParserError(LxmlError): """Internal lxml parser error. """ @cython.final @cython.internal cdef class _ParserDictionaryContext: # Global parser context to share the string dictionary. # # This class is a delegate singleton! # # It creates _ParserDictionaryContext objects for each thread to keep thread state, # but those must never be used directly. Always stick to using the static # __GLOBAL_PARSER_CONTEXT as defined below the class. # cdef tree.xmlDict* _c_dict cdef _BaseParser _default_parser cdef list _implied_parser_contexts def __cinit__(self): self._c_dict = NULL self._implied_parser_contexts = [] def __dealloc__(self): if self._c_dict is not NULL: xmlparser.xmlDictFree(self._c_dict) cdef void initMainParserContext(self): u"""Put the global context into the thread dictionary of the main thread. To be called once and only in the main thread.""" thread_dict = python.PyThreadState_GetDict() if thread_dict is not NULL: (<dict>thread_dict)[u"_ParserDictionaryContext"] = self cdef _ParserDictionaryContext _findThreadParserContext(self): u"Find (or create) the _ParserDictionaryContext object for the current thread" cdef _ParserDictionaryContext context thread_dict = python.PyThreadState_GetDict() if thread_dict is NULL: return self d = <dict>thread_dict result = python.PyDict_GetItem(d, u"_ParserDictionaryContext") if result is not NULL: return <object>result context = <_ParserDictionaryContext>_ParserDictionaryContext.__new__(_ParserDictionaryContext) d[u"_ParserDictionaryContext"] = context return context cdef void setDefaultParser(self, _BaseParser parser): u"Set the default parser for the current thread" cdef _ParserDictionaryContext context context = self._findThreadParserContext() context._default_parser = parser cdef _BaseParser getDefaultParser(self): u"Return (or create) the default parser of the current thread" cdef _ParserDictionaryContext context context = self._findThreadParserContext() if context._default_parser is None: if self._default_parser is None: self._default_parser = __DEFAULT_XML_PARSER._copy() if context is not self: context._default_parser = self._default_parser._copy() return context._default_parser cdef tree.xmlDict* _getThreadDict(self, tree.xmlDict* default): u"Return the thread-local dict or create a new one if necessary." cdef _ParserDictionaryContext context context = self._findThreadParserContext() if context._c_dict is NULL: # thread dict not yet set up => use default or create a new one if default is not NULL: context._c_dict = default xmlparser.xmlDictReference(default) return default if self._c_dict is NULL: self._c_dict = xmlparser.xmlDictCreate() if context is not self: context._c_dict = xmlparser.xmlDictCreateSub(self._c_dict) return context._c_dict cdef void initThreadDictRef(self, tree.xmlDict** c_dict_ref): c_dict = c_dict_ref[0] c_thread_dict = self._getThreadDict(c_dict) if c_dict is c_thread_dict: return if c_dict is not NULL: xmlparser.xmlDictFree(c_dict) c_dict_ref[0] = c_thread_dict xmlparser.xmlDictReference(c_thread_dict) cdef void initParserDict(self, xmlparser.xmlParserCtxt* pctxt): u"Assure we always use the same string dictionary." self.initThreadDictRef(&pctxt.dict) pctxt.dictNames = 1 cdef void initXPathParserDict(self, xpath.xmlXPathContext* pctxt): u"Assure we always use the same string dictionary." self.initThreadDictRef(&pctxt.dict) cdef void initDocDict(self, xmlDoc* result): u"Store dict of last object parsed if no shared dict yet" # XXX We also free the result dict here if there already was one. # This case should only occur for new documents with empty dicts, # otherwise we'd free data that's in use => segfault self.initThreadDictRef(&result.dict) cdef _ParserContext findImpliedContext(self): u"""Return any current implied xml parser context for the current thread. This is used when the resolver functions are called with an xmlParserCtxt that was generated from within libxml2 (i.e. without a _ParserContext) - which happens when parsing schema and xinclude external references.""" cdef _ParserDictionaryContext context cdef _ParserContext implied_context # see if we have a current implied parser context = self._findThreadParserContext() if context._implied_parser_contexts: implied_context = context._implied_parser_contexts[-1] return implied_context return None cdef void pushImpliedContextFromParser(self, _BaseParser parser): u"Push a new implied context object taken from the parser." if parser is not None: self.pushImpliedContext(parser._getParserContext()) else: self.pushImpliedContext(None) cdef void pushImpliedContext(self, _ParserContext parser_context): u"Push a new implied context object." cdef _ParserDictionaryContext context context = self._findThreadParserContext() context._implied_parser_contexts.append(parser_context) cdef void popImpliedContext(self): u"Pop the current implied context object." cdef _ParserDictionaryContext context context = self._findThreadParserContext() context._implied_parser_contexts.pop() cdef _ParserDictionaryContext __GLOBAL_PARSER_CONTEXT = _ParserDictionaryContext() __GLOBAL_PARSER_CONTEXT.initMainParserContext() ############################################################ ## support for Python unicode I/O ############################################################ # name of Python Py_UNICODE encoding as known to libxml2 cdef const_char* _PY_UNICODE_ENCODING = NULL cdef int _setupPythonUnicode() except -1: u"""Sets _PY_UNICODE_ENCODING to the internal encoding name of Python unicode strings if libxml2 supports reading native Python unicode. This depends on iconv and the local Python installation, so we simply check if we find a matching encoding handler. """ cdef tree.xmlCharEncodingHandler* enchandler cdef Py_ssize_t l cdef const_char* enc cdef Py_UNICODE *uchars = [c'<', c't', c'e', c's', c't', c'/', c'>'] cdef const_xmlChar* buffer = <const_xmlChar*>uchars # apparently, libxml2 can't detect UTF-16 on some systems if (buffer[0] == c'<' and buffer[1] == c'\0' and buffer[2] == c't' and buffer[3] == c'\0'): enc = "UTF-16LE" elif (buffer[0] == c'\0' and buffer[1] == c'<' and buffer[2] == c'\0' and buffer[3] == c't'): enc = "UTF-16BE" else: # let libxml2 give it a try enc = _findEncodingName(buffer, sizeof(Py_UNICODE) * 7) if enc is NULL: # not my fault, it's YOUR broken system :) return 0 enchandler = tree.xmlFindCharEncodingHandler(enc) if enchandler is not NULL: global _PY_UNICODE_ENCODING tree.xmlCharEncCloseFunc(enchandler) _PY_UNICODE_ENCODING = enc return 0 cdef const_char* _findEncodingName(const_xmlChar* buffer, int size): u"Work around bug in libxml2: find iconv name of encoding on our own." cdef tree.xmlCharEncoding enc enc = tree.xmlDetectCharEncoding(buffer, size) if enc == tree.XML_CHAR_ENCODING_UTF16LE: if size >= 4 and (buffer[0] == <const_xmlChar>'\xFF' and buffer[1] == <const_xmlChar>'\xFE' and buffer[2] == 0 and buffer[3] == 0): return "UTF-32LE" # according to BOM else: return "UTF-16LE" elif enc == tree.XML_CHAR_ENCODING_UTF16BE: return "UTF-16BE" elif enc == tree.XML_CHAR_ENCODING_UCS4LE: return "UCS-4LE" elif enc == tree.XML_CHAR_ENCODING_UCS4BE: return "UCS-4BE" elif enc == tree.XML_CHAR_ENCODING_NONE: return NULL else: # returns a constant char*, no need to free it return tree.xmlGetCharEncodingName(enc) _setupPythonUnicode() ############################################################ ## support for file-like objects ############################################################ @cython.final @cython.internal cdef class _FileReaderContext: cdef object _filelike cdef object _encoding cdef object _url cdef object _bytes cdef _ExceptionContext _exc_context cdef Py_ssize_t _bytes_read cdef char* _c_url cdef bint _close_file_after_read def __cinit__(self, filelike, exc_context not None, url, encoding=None, bint close_file=False): self._exc_context = exc_context self._filelike = filelike self._close_file_after_read = close_file self._encoding = encoding if url is None: self._c_url = NULL else: url = _encodeFilename(url) self._c_url = _cstr(url) self._url = url self._bytes = b'' self._bytes_read = 0 cdef _close_file(self): if self._filelike is None or not self._close_file_after_read: return try: close = self._filelike.close except AttributeError: close = None finally: self._filelike = None if close is not None: close() cdef xmlparser.xmlParserInputBuffer* _createParserInputBuffer(self): cdef stdio.FILE* c_stream cdef xmlparser.xmlParserInputBuffer* c_buffer c_buffer = xmlparser.xmlAllocParserInputBuffer(0) c_stream = python.PyFile_AsFile(self._filelike) if c_stream is NULL: c_buffer.readcallback = _readFilelikeParser c_buffer.context = <python.PyObject*>self else: c_buffer.readcallback = _readFileParser c_buffer.context = c_stream return c_buffer cdef xmlparser.xmlParserInput* _createParserInput( self, xmlparser.xmlParserCtxt* ctxt): cdef xmlparser.xmlParserInputBuffer* c_buffer c_buffer = self._createParserInputBuffer() return xmlparser.xmlNewIOInputStream(ctxt, c_buffer, 0) cdef tree.xmlDtd* _readDtd(self): cdef xmlparser.xmlParserInputBuffer* c_buffer c_buffer = self._createParserInputBuffer() with nogil: return xmlparser.xmlIOParseDTD(NULL, c_buffer, 0) cdef xmlDoc* _readDoc(self, xmlparser.xmlParserCtxt* ctxt, int options): cdef xmlDoc* result cdef char* c_encoding cdef stdio.FILE* c_stream cdef xmlparser.xmlInputReadCallback c_read_callback cdef xmlparser.xmlInputCloseCallback c_close_callback cdef void* c_callback_context if self._encoding is None: c_encoding = NULL else: c_encoding = _cstr(self._encoding) c_stream = python.PyFile_AsFile(self._filelike) if c_stream is NULL: c_read_callback = _readFilelikeParser c_callback_context = <python.PyObject*>self else: c_read_callback = _readFileParser c_callback_context = c_stream orig_options = ctxt.options with nogil: if ctxt.html: result = htmlparser.htmlCtxtReadIO( ctxt, c_read_callback, NULL, c_callback_context, self._c_url, c_encoding, options) if result is not NULL: if _fixHtmlDictNames(ctxt.dict, result) < 0: tree.xmlFreeDoc(result) result = NULL else: result = xmlparser.xmlCtxtReadIO( ctxt, c_read_callback, NULL, c_callback_context, self._c_url, c_encoding, options) ctxt.options = orig_options # work around libxml2 problem try: self._close_file() except: self._exc_context._store_raised() finally: return result # swallow any exceptions cdef int copyToBuffer(self, char* c_buffer, int c_requested): cdef int c_byte_count = 0 cdef char* c_start cdef Py_ssize_t byte_count, remaining if self._bytes_read < 0: return 0 try: byte_count = python.PyBytes_GET_SIZE(self._bytes) remaining = byte_count - self._bytes_read while c_requested > remaining: c_start = _cstr(self._bytes) + self._bytes_read cstring_h.memcpy(c_buffer, c_start, remaining) c_byte_count += remaining c_buffer += remaining c_requested -= remaining self._bytes = self._filelike.read(c_requested) if not isinstance(self._bytes, bytes): if isinstance(self._bytes, unicode): if self._encoding is None: self._bytes = (<unicode>self._bytes).encode('utf8') else: self._bytes = python.PyUnicode_AsEncodedString( self._bytes, _cstr(self._encoding), NULL) else: self._close_file() raise TypeError, \ u"reading from file-like objects must return byte strings or unicode strings" remaining = python.PyBytes_GET_SIZE(self._bytes) if remaining == 0: self._bytes_read = -1 self._close_file() return c_byte_count self._bytes_read = 0 if c_requested > 0: c_start = _cstr(self._bytes) + self._bytes_read cstring_h.memcpy(c_buffer, c_start, c_requested) c_byte_count += c_requested self._bytes_read += c_requested except: c_byte_count = -1 self._exc_context._store_raised() try: self._close_file() except: self._exc_context._store_raised() finally: return c_byte_count # swallow any exceptions cdef int _readFilelikeParser(void* ctxt, char* c_buffer, int c_size) with gil: return (<_FileReaderContext>ctxt).copyToBuffer(c_buffer, c_size) cdef int _readFileParser(void* ctxt, char* c_buffer, int c_size) nogil: return stdio.fread(c_buffer, 1, c_size, <stdio.FILE*>ctxt) ############################################################ ## support for custom document loaders ############################################################ cdef xmlparser.xmlParserInput* _local_resolver(const_char* c_url, const_char* c_pubid, xmlparser.xmlParserCtxt* c_context) with gil: cdef _ResolverContext context cdef xmlparser.xmlParserInput* c_input cdef _InputDocument doc_ref cdef _FileReaderContext file_context # if there is no _ParserContext associated with the xmlParserCtxt # passed, check to see if the thread state object has an implied # context. if c_context._private is not NULL: context = <_ResolverContext>c_context._private else: context = __GLOBAL_PARSER_CONTEXT.findImpliedContext() if context is None: if __DEFAULT_ENTITY_LOADER is NULL: return NULL with nogil: # free the GIL as we might do serious I/O here (e.g. HTTP) c_input = __DEFAULT_ENTITY_LOADER(c_url, c_pubid, c_context) return c_input try: if c_url is NULL: url = None else: # parsing a related document (DTD etc.) => UTF-8 encoded URL? url = _decodeFilename(<const_xmlChar*>c_url) if c_pubid is NULL: pubid = None else: pubid = funicode(<const_xmlChar*>c_pubid) # always UTF-8 doc_ref = context._resolvers.resolve(url, pubid, context) except: context._store_raised() return NULL if doc_ref is not None: if doc_ref._type == PARSER_DATA_STRING: data = doc_ref._data_bytes filename = doc_ref._filename if not filename: filename = None elif not isinstance(filename, bytes): # most likely a text URL filename = filename.encode('utf8') if not isinstance(filename, bytes): filename = None c_input = xmlparser.xmlNewInputStream(c_context) if c_input is not NULL: if filename is not None: c_input.filename = <char *>tree.xmlStrdup(_xcstr(filename)) c_input.base = _xcstr(data) c_input.length = python.PyBytes_GET_SIZE(data) c_input.cur = c_input.base c_input.end = c_input.base + c_input.length elif doc_ref._type == PARSER_DATA_FILENAME: data = None c_filename = _cstr(doc_ref._filename) with nogil: # free the GIL as we might do serious I/O here c_input = xmlparser.xmlNewInputFromFile( c_context, c_filename) elif doc_ref._type == PARSER_DATA_FILE: file_context = _FileReaderContext(doc_ref._file, context, url, None, doc_ref._close_file) c_input = file_context._createParserInput(c_context) data = file_context else: data = None c_input = NULL if data is not None: context._storage.add(data) if c_input is not NULL: return c_input if __DEFAULT_ENTITY_LOADER is NULL: return NULL with nogil: # free the GIL as we might do serious I/O here (e.g. HTTP) c_input = __DEFAULT_ENTITY_LOADER(c_url, c_pubid, c_context) return c_input cdef xmlparser.xmlExternalEntityLoader __DEFAULT_ENTITY_LOADER __DEFAULT_ENTITY_LOADER = xmlparser.xmlGetExternalEntityLoader() cdef xmlparser.xmlExternalEntityLoader _register_document_loader() nogil: cdef xmlparser.xmlExternalEntityLoader old = xmlparser.xmlGetExternalEntityLoader() xmlparser.xmlSetExternalEntityLoader(<xmlparser.xmlExternalEntityLoader>_local_resolver) return old cdef void _reset_document_loader(xmlparser.xmlExternalEntityLoader old) nogil: xmlparser.xmlSetExternalEntityLoader(old) ############################################################ ## Parsers ############################################################ @cython.no_gc_clear # May have to call "self._validator.disconnect()" on dealloc. @cython.internal cdef class _ParserContext(_ResolverContext): cdef _ErrorLog _error_log cdef _ParserSchemaValidationContext _validator cdef xmlparser.xmlParserCtxt* _c_ctxt cdef xmlparser.xmlExternalEntityLoader _orig_loader cdef python.PyThread_type_lock _lock cdef _Document _doc cdef bint _collect_ids def __cinit__(self): self._c_ctxt = NULL self._collect_ids = True if not config.ENABLE_THREADING: self._lock = NULL else: self._lock = python.PyThread_allocate_lock() self._error_log = _ErrorLog() def __dealloc__(self): if config.ENABLE_THREADING and self._lock is not NULL: python.PyThread_free_lock(self._lock) self._lock = NULL if self._c_ctxt is not NULL: if <void*>self._validator is not NULL and self._validator is not None: # If the parser was not closed correctly (e.g. interrupted iterparse()), # and the schema validator wasn't freed and cleaned up yet, the libxml2 SAX # validator plug might still be in place, which will make xmlFreeParserCtxt() # crash when trying to xmlFree() a static SAX handler. # Thus, make sure we disconnect the handler interceptor here at the latest. self._validator.disconnect() xmlparser.xmlFreeParserCtxt(self._c_ctxt) cdef _ParserContext _copy(self): cdef _ParserContext context context = self.__class__() context._collect_ids = self._collect_ids context._validator = self._validator.copy() _initParserContext(context, self._resolvers._copy(), NULL) return context cdef void _initParserContext(self, xmlparser.xmlParserCtxt* c_ctxt): self._c_ctxt = c_ctxt c_ctxt._private = <void*>self cdef void _resetParserContext(self): if self._c_ctxt is not NULL: if self._c_ctxt.html: htmlparser.htmlCtxtReset(self._c_ctxt) self._c_ctxt.disableSAX = 0 # work around bug in libxml2 else: xmlparser.xmlClearParserCtxt(self._c_ctxt) # work around bug in libxml2 [2.9.10 .. 2.9.14]: # https://gitlab.gnome.org/GNOME/libxml2/-/issues/378 self._c_ctxt.nsNr = 0 cdef int prepare(self, bint set_document_loader=True) except -1: cdef int result if config.ENABLE_THREADING and self._lock is not NULL: with nogil: result = python.PyThread_acquire_lock( self._lock, python.WAIT_LOCK) if result == 0: raise ParserError, u"parser locking failed" self._error_log.clear() self._doc = None self._c_ctxt.sax.serror = _receiveParserError self._orig_loader = _register_document_loader() if set_document_loader else NULL if self._validator is not None: self._validator.connect(self._c_ctxt, self._error_log) return 0 cdef int cleanup(self) except -1: if self._orig_loader is not NULL: _reset_document_loader(self._orig_loader) try: if self._validator is not None: self._validator.disconnect() self._resetParserContext() self.clear() self._doc = None self._c_ctxt.sax.serror = NULL finally: if config.ENABLE_THREADING and self._lock is not NULL: python.PyThread_release_lock(self._lock) return 0 cdef object _handleParseResult(self, _BaseParser parser, xmlDoc* result, filename): c_doc = self._handleParseResultDoc(parser, result, filename) if self._doc is not None and self._doc._c_doc is c_doc: return self._doc else: return _documentFactory(c_doc, parser) cdef xmlDoc* _handleParseResultDoc(self, _BaseParser parser, xmlDoc* result, filename) except NULL: recover = parser._parse_options & xmlparser.XML_PARSE_RECOVER return _handleParseResult(self, self._c_ctxt, result, filename, recover, free_doc=self._doc is None) cdef _initParserContext(_ParserContext context, _ResolverRegistry resolvers, xmlparser.xmlParserCtxt* c_ctxt): _initResolverContext(context, resolvers) if c_ctxt is not NULL: context._initParserContext(c_ctxt) cdef void _forwardParserError(xmlparser.xmlParserCtxt* _parser_context, xmlerror.xmlError* error) with gil: (<_ParserContext>_parser_context._private)._error_log._receive(error) cdef void _receiveParserError(void* c_context, xmlerror.xmlError* error) nogil: if __DEBUG: if c_context is NULL or (<xmlparser.xmlParserCtxt*>c_context)._private is NULL: _forwardError(NULL, error) else: _forwardParserError(<xmlparser.xmlParserCtxt*>c_context, error) cdef int _raiseParseError(xmlparser.xmlParserCtxt* ctxt, filename, _ErrorLog error_log) except -1: if filename is not None and \ ctxt.lastError.domain == xmlerror.XML_FROM_IO: if isinstance(filename, bytes): filename = _decodeFilenameWithLength( <bytes>filename, len(<bytes>filename)) if ctxt.lastError.message is not NULL: try: message = ctxt.lastError.message.decode('utf-8') except UnicodeDecodeError: # the filename may be in there => play it safe message = ctxt.lastError.message.decode('iso8859-1') message = f"Error reading file '{filename}': {message.strip()}" else: message = f"Error reading '{filename}'" raise IOError, message elif error_log: raise error_log._buildParseException( XMLSyntaxError, u"Document is not well formed") elif ctxt.lastError.message is not NULL: message = ctxt.lastError.message.strip() code = ctxt.lastError.code line = ctxt.lastError.line column = ctxt.lastError.int2 if ctxt.lastError.line > 0: message = f"line {line}: {message}" raise XMLSyntaxError(message, code, line, column, filename) else: raise XMLSyntaxError(None, xmlerror.XML_ERR_INTERNAL_ERROR, 0, 0, filename) cdef xmlDoc* _handleParseResult(_ParserContext context, xmlparser.xmlParserCtxt* c_ctxt, xmlDoc* result, filename, bint recover, bint free_doc) except NULL: cdef bint well_formed if result is not NULL: __GLOBAL_PARSER_CONTEXT.initDocDict(result) if c_ctxt.myDoc is not NULL: if c_ctxt.myDoc is not result: __GLOBAL_PARSER_CONTEXT.initDocDict(c_ctxt.myDoc) tree.xmlFreeDoc(c_ctxt.myDoc) c_ctxt.myDoc = NULL if result is not NULL: if (context._validator is not None and not context._validator.isvalid()): well_formed = 0 # actually not 'valid', but anyway ... elif (not c_ctxt.wellFormed and not c_ctxt.html and c_ctxt.charset == tree.XML_CHAR_ENCODING_8859_1 and [1 for error in context._error_log if error.type == ErrorTypes.ERR_INVALID_CHAR]): # An encoding error occurred and libxml2 switched from UTF-8 # input to (undecoded) Latin-1, at some arbitrary point in the # document. Better raise an error than allowing for a broken # tree with mixed encodings. well_formed = 0 elif recover or (c_ctxt.wellFormed and c_ctxt.lastError.level < xmlerror.XML_ERR_ERROR): well_formed = 1 elif not c_ctxt.replaceEntities and not c_ctxt.validate \ and context is not None: # in this mode, we ignore errors about undefined entities for error in context._error_log.filter_from_errors(): if error.type != ErrorTypes.WAR_UNDECLARED_ENTITY and \ error.type != ErrorTypes.ERR_UNDECLARED_ENTITY: well_formed = 0 break else: well_formed = 1 else: well_formed = 0 if not well_formed: if free_doc: tree.xmlFreeDoc(result) result = NULL if context is not None and context._has_raised(): if result is not NULL: if free_doc: tree.xmlFreeDoc(result) result = NULL context._raise_if_stored() if result is NULL: if context is not None: _raiseParseError(c_ctxt, filename, context._error_log) else: _raiseParseError(c_ctxt, filename, None) else: if result.URL is NULL and filename is not None: result.URL = tree.xmlStrdup(_xcstr(filename)) if result.encoding is NULL: result.encoding = tree.xmlStrdup(<unsigned char*>"UTF-8") if context._validator is not None and \ context._validator._add_default_attributes: # we currently need to do this here as libxml2 does not # support inserting default attributes during parse-time # validation context._validator.inject_default_attributes(result) return result cdef int _fixHtmlDictNames(tree.xmlDict* c_dict, xmlDoc* c_doc) nogil: cdef xmlNode* c_node if c_doc is NULL: return 0 c_node = c_doc.children tree.BEGIN_FOR_EACH_ELEMENT_FROM(<xmlNode*>c_doc, c_node, 1) if c_node.type == tree.XML_ELEMENT_NODE: if _fixHtmlDictNodeNames(c_dict, c_node) < 0: return -1 tree.END_FOR_EACH_ELEMENT_FROM(c_node) return 0 cdef int _fixHtmlDictSubtreeNames(tree.xmlDict* c_dict, xmlDoc* c_doc, xmlNode* c_start_node) nogil: """ Move names to the dict, iterating in document order, starting at c_start_node. This is used in incremental parsing after each chunk. """ cdef xmlNode* c_node if not c_doc: return 0 if not c_start_node: return _fixHtmlDictNames(c_dict, c_doc) c_node = c_start_node tree.BEGIN_FOR_EACH_ELEMENT_FROM(<xmlNode*>c_doc, c_node, 1) if c_node.type == tree.XML_ELEMENT_NODE: if _fixHtmlDictNodeNames(c_dict, c_node) < 0: return -1 tree.END_FOR_EACH_ELEMENT_FROM(c_node) return 0 cdef inline int _fixHtmlDictNodeNames(tree.xmlDict* c_dict, xmlNode* c_node) nogil: cdef xmlNode* c_attr c_name = tree.xmlDictLookup(c_dict, c_node.name, -1) if c_name is NULL: return -1 if c_name is not c_node.name: tree.xmlFree(<char*>c_node.name) c_node.name = c_name c_attr = <xmlNode*>c_node.properties while c_attr is not NULL: c_name = tree.xmlDictLookup(c_dict, c_attr.name, -1) if c_name is NULL: return -1 if c_name is not c_attr.name: tree.xmlFree(<char*>c_attr.name) c_attr.name = c_name c_attr = c_attr.next return 0 @cython.internal cdef class _BaseParser: cdef ElementClassLookup _class_lookup cdef _ResolverRegistry _resolvers cdef _ParserContext _parser_context cdef _ParserContext _push_parser_context cdef int _parse_options cdef bint _for_html cdef bint _remove_comments cdef bint _remove_pis cdef bint _strip_cdata cdef bint _collect_ids cdef XMLSchema _schema cdef bytes _filename cdef readonly object target cdef object _default_encoding cdef tuple _events_to_collect # (event_types, tag) def __init__(self, int parse_options, bint for_html, XMLSchema schema, remove_comments, remove_pis, strip_cdata, collect_ids, target, encoding): cdef tree.xmlCharEncodingHandler* enchandler cdef int c_encoding if not isinstance(self, (XMLParser, HTMLParser)): raise TypeError, u"This class cannot be instantiated" self._parse_options = parse_options self.target = target self._for_html = for_html self._remove_comments = remove_comments self._remove_pis = remove_pis self._strip_cdata = strip_cdata self._collect_ids = collect_ids self._schema = schema self._resolvers = _ResolverRegistry() if encoding is None: self._default_encoding = None else: encoding = _utf8(encoding) enchandler = tree.xmlFindCharEncodingHandler(_cstr(encoding)) if enchandler is NULL: raise LookupError, f"unknown encoding: '{encoding}'" tree.xmlCharEncCloseFunc(enchandler) self._default_encoding = encoding cdef _setBaseURL(self, base_url): self._filename = _encodeFilename(base_url) cdef _collectEvents(self, event_types, tag): if event_types is None: event_types = () else: event_types = tuple(set(event_types)) _buildParseEventFilter(event_types) # purely for validation self._events_to_collect = (event_types, tag) cdef _ParserContext _getParserContext(self): cdef xmlparser.xmlParserCtxt* pctxt if self._parser_context is None: self._parser_context = self._createContext(self.target, None) self._parser_context._collect_ids = self._collect_ids if self._schema is not None: self._parser_context._validator = \ self._schema._newSaxValidator( self._parse_options & xmlparser.XML_PARSE_DTDATTR) pctxt = self._newParserCtxt() _initParserContext(self._parser_context, self._resolvers, pctxt) self._configureSaxContext(pctxt) return self._parser_context cdef _ParserContext _getPushParserContext(self): cdef xmlparser.xmlParserCtxt* pctxt if self._push_parser_context is None: self._push_parser_context = self._createContext( self.target, self._events_to_collect) self._push_parser_context._collect_ids = self._collect_ids if self._schema is not None: self._push_parser_context._validator = \ self._schema._newSaxValidator( self._parse_options & xmlparser.XML_PARSE_DTDATTR) pctxt = self._newPushParserCtxt() _initParserContext( self._push_parser_context, self._resolvers, pctxt) self._configureSaxContext(pctxt) return self._push_parser_context cdef _ParserContext _createContext(self, target, events_to_collect): cdef _SaxParserContext sax_context if target is not None: sax_context = _TargetParserContext(self) (<_TargetParserContext>sax_context)._setTarget(target) elif events_to_collect: sax_context = _SaxParserContext(self) else: # nothing special to configure return _ParserContext() if events_to_collect: events, tag = events_to_collect sax_context._setEventFilter(events, tag) return sax_context @cython.final cdef int _configureSaxContext(self, xmlparser.xmlParserCtxt* pctxt) except -1: if self._remove_comments: pctxt.sax.comment = NULL if self._remove_pis: pctxt.sax.processingInstruction = NULL if self._strip_cdata: # hard switch-off for CDATA nodes => makes them plain text pctxt.sax.cdataBlock = NULL cdef int _registerHtmlErrorHandler(self, xmlparser.xmlParserCtxt* c_ctxt) except -1: cdef xmlparser.xmlSAXHandler* sax = c_ctxt.sax if sax is not NULL and sax.initialized and sax.initialized != xmlparser.XML_SAX2_MAGIC: # need to extend SAX1 context to SAX2 to get proper error reports if <xmlparser.xmlSAXHandlerV1*>sax is &htmlparser.htmlDefaultSAXHandler: sax = <xmlparser.xmlSAXHandler*> tree.xmlMalloc(sizeof(xmlparser.xmlSAXHandler)) if sax is NULL: raise MemoryError() cstring_h.memcpy(sax, &htmlparser.htmlDefaultSAXHandler, sizeof(htmlparser.htmlDefaultSAXHandler)) c_ctxt.sax = sax sax.initialized = xmlparser.XML_SAX2_MAGIC sax.serror = _receiveParserError sax.startElementNs = NULL sax.endElementNs = NULL sax._private = NULL return 0 cdef xmlparser.xmlParserCtxt* _newParserCtxt(self) except NULL: cdef xmlparser.xmlParserCtxt* c_ctxt if self._for_html: c_ctxt = htmlparser.htmlCreateMemoryParserCtxt('dummy', 5) if c_ctxt is not NULL: self._registerHtmlErrorHandler(c_ctxt) else: c_ctxt = xmlparser.xmlNewParserCtxt() if c_ctxt is NULL: raise MemoryError c_ctxt.sax.startDocument = _initSaxDocument return c_ctxt cdef xmlparser.xmlParserCtxt* _newPushParserCtxt(self) except NULL: cdef xmlparser.xmlParserCtxt* c_ctxt cdef char* c_filename = _cstr(self._filename) if self._filename is not None else NULL if self._for_html: c_ctxt = htmlparser.htmlCreatePushParserCtxt( NULL, NULL, NULL, 0, c_filename, tree.XML_CHAR_ENCODING_NONE) if c_ctxt is not NULL: self._registerHtmlErrorHandler(c_ctxt) htmlparser.htmlCtxtUseOptions(c_ctxt, self._parse_options) else: c_ctxt = xmlparser.xmlCreatePushParserCtxt( NULL, NULL, NULL, 0, c_filename) if c_ctxt is not NULL: xmlparser.xmlCtxtUseOptions(c_ctxt, self._parse_options) if c_ctxt is NULL: raise MemoryError() c_ctxt.sax.startDocument = _initSaxDocument return c_ctxt @property def error_log(self): """The error log of the last parser run. """ cdef _ParserContext context context = self._getParserContext() return context._error_log.copy() @property def resolvers(self): """The custom resolver registry of this parser.""" return self._resolvers @property def version(self): """The version of the underlying XML parser.""" return u"libxml2 %d.%d.%d" % LIBXML_VERSION def setElementClassLookup(self, ElementClassLookup lookup = None): u":deprecated: use ``parser.set_element_class_lookup(lookup)`` instead." self.set_element_class_lookup(lookup) def set_element_class_lookup(self, ElementClassLookup lookup = None): u"""set_element_class_lookup(self, lookup = None) Set a lookup scheme for element classes generated from this parser. Reset it by passing None or nothing. """ self._class_lookup = lookup cdef _BaseParser _copy(self): u"Create a new parser with the same configuration." cdef _BaseParser parser parser = self.__class__() parser._parse_options = self._parse_options parser._for_html = self._for_html parser._remove_comments = self._remove_comments parser._remove_pis = self._remove_pis parser._strip_cdata = self._strip_cdata parser._filename = self._filename parser._resolvers = self._resolvers parser.target = self.target parser._class_lookup = self._class_lookup parser._default_encoding = self._default_encoding parser._schema = self._schema parser._events_to_collect = self._events_to_collect return parser def copy(self): u"""copy(self) Create a new parser with the same configuration. """ return self._copy() def makeelement(self, _tag, attrib=None, nsmap=None, **_extra): u"""makeelement(self, _tag, attrib=None, nsmap=None, **_extra) Creates a new element associated with this parser. """ return _makeElement(_tag, NULL, None, self, None, None, attrib, nsmap, _extra) # internal parser methods cdef xmlDoc* _parseUnicodeDoc(self, utext, char* c_filename) except NULL: u"""Parse unicode document, share dictionary if possible. """ cdef _ParserContext context cdef xmlDoc* result cdef xmlparser.xmlParserCtxt* pctxt cdef Py_ssize_t py_buffer_len cdef int buffer_len, c_kind cdef const_char* c_text cdef const_char* c_encoding = _PY_UNICODE_ENCODING cdef bint is_pep393_string = ( python.PEP393_ENABLED and python.PyUnicode_IS_READY(utext)) if is_pep393_string: c_text = <const_char*>python.PyUnicode_DATA(utext) py_buffer_len = python.PyUnicode_GET_LENGTH(utext) c_kind = python.PyUnicode_KIND(utext) if c_kind == 1: c_encoding = 'ISO-8859-1' elif c_kind == 2: py_buffer_len *= 2 if python.PY_BIG_ENDIAN: c_encoding = 'UTF-16BE' # actually UCS-2 else: c_encoding = 'UTF-16LE' # actually UCS-2 elif c_kind == 4: py_buffer_len *= 4 if python.PY_BIG_ENDIAN: c_encoding = 'UCS-4BE' else: c_encoding = 'UCS-4LE' else: assert False, f"Illegal Unicode kind {c_kind}" else: py_buffer_len = python.PyUnicode_GET_DATA_SIZE(utext) c_text = python.PyUnicode_AS_DATA(utext) assert 0 <= py_buffer_len <= limits.INT_MAX buffer_len = py_buffer_len context = self._getParserContext() context.prepare() try: pctxt = context._c_ctxt __GLOBAL_PARSER_CONTEXT.initParserDict(pctxt) orig_options = pctxt.options with nogil: if self._for_html: result = htmlparser.htmlCtxtReadMemory( pctxt, c_text, buffer_len, c_filename, c_encoding, self._parse_options) if result is not NULL: if _fixHtmlDictNames(pctxt.dict, result) < 0: tree.xmlFreeDoc(result) result = NULL else: result = xmlparser.xmlCtxtReadMemory( pctxt, c_text, buffer_len, c_filename, c_encoding, self._parse_options) pctxt.options = orig_options # work around libxml2 problem return context._handleParseResultDoc(self, result, None) finally: context.cleanup() cdef xmlDoc* _parseDoc(self, char* c_text, int c_len, char* c_filename) except NULL: u"""Parse document, share dictionary if possible. """ cdef _ParserContext context cdef xmlDoc* result cdef xmlparser.xmlParserCtxt* pctxt cdef char* c_encoding cdef tree.xmlCharEncoding enc context = self._getParserContext() context.prepare() try: pctxt = context._c_ctxt __GLOBAL_PARSER_CONTEXT.initParserDict(pctxt) if self._default_encoding is None: c_encoding = NULL # libxml2 (at least 2.9.3) does not recognise UTF-32 BOMs # NOTE: limit to problematic cases because it changes character offsets if c_len >= 4 and (c_text[0] == '\xFF' and c_text[1] == '\xFE' and c_text[2] == 0 and c_text[3] == 0): c_encoding = "UTF-32LE" c_text += 4 c_len -= 4 elif c_len >= 4 and (c_text[0] == 0 and c_text[1] == 0 and c_text[2] == '\xFE' and c_text[3] == '\xFF'): c_encoding = "UTF-32BE" c_text += 4 c_len -= 4 else: # no BOM => try to determine encoding enc = tree.xmlDetectCharEncoding(<const_xmlChar*>c_text, c_len) if enc == tree.XML_CHAR_ENCODING_UCS4LE: c_encoding = 'UTF-32LE' elif enc == tree.XML_CHAR_ENCODING_UCS4BE: c_encoding = 'UTF-32BE' else: c_encoding = _cstr(self._default_encoding) orig_options = pctxt.options with nogil: if self._for_html: result = htmlparser.htmlCtxtReadMemory( pctxt, c_text, c_len, c_filename, c_encoding, self._parse_options) if result is not NULL: if _fixHtmlDictNames(pctxt.dict, result) < 0: tree.xmlFreeDoc(result) result = NULL else: result = xmlparser.xmlCtxtReadMemory( pctxt, c_text, c_len, c_filename, c_encoding, self._parse_options) pctxt.options = orig_options # work around libxml2 problem return context._handleParseResultDoc(self, result, None) finally: context.cleanup() cdef xmlDoc* _parseDocFromFile(self, char* c_filename) except NULL: cdef _ParserContext context cdef xmlDoc* result cdef xmlparser.xmlParserCtxt* pctxt cdef char* c_encoding result = NULL context = self._getParserContext() context.prepare() try: pctxt = context._c_ctxt __GLOBAL_PARSER_CONTEXT.initParserDict(pctxt) if self._default_encoding is None: c_encoding = NULL else: c_encoding = _cstr(self._default_encoding) orig_options = pctxt.options with nogil: if self._for_html: result = htmlparser.htmlCtxtReadFile( pctxt, c_filename, c_encoding, self._parse_options) if result is not NULL: if _fixHtmlDictNames(pctxt.dict, result) < 0: tree.xmlFreeDoc(result) result = NULL else: result = xmlparser.xmlCtxtReadFile( pctxt, c_filename, c_encoding, self._parse_options) pctxt.options = orig_options # work around libxml2 problem return context._handleParseResultDoc(self, result, c_filename) finally: context.cleanup() cdef xmlDoc* _parseDocFromFilelike(self, filelike, filename, encoding) except NULL: cdef _ParserContext context cdef _FileReaderContext file_context cdef xmlDoc* result cdef xmlparser.xmlParserCtxt* pctxt cdef char* c_filename if not filename: filename = None context = self._getParserContext() context.prepare() try: pctxt = context._c_ctxt __GLOBAL_PARSER_CONTEXT.initParserDict(pctxt) file_context = _FileReaderContext( filelike, context, filename, encoding or self._default_encoding) result = file_context._readDoc(pctxt, self._parse_options) return context._handleParseResultDoc( self, result, filename) finally: context.cleanup() cdef void _initSaxDocument(void* ctxt) with gil: xmlparser.xmlSAX2StartDocument(ctxt) c_ctxt = <xmlparser.xmlParserCtxt*>ctxt c_doc = c_ctxt.myDoc # set up document dict if c_doc and c_ctxt.dict and not c_doc.dict: # I have no idea why libxml2 disables this - we need it c_ctxt.dictNames = 1 c_doc.dict = c_ctxt.dict xmlparser.xmlDictReference(c_ctxt.dict) # set up XML ID hash table if c_ctxt._private: context = <_ParserContext>c_ctxt._private if context._collect_ids: # keep the global parser dict from filling up with XML IDs if c_doc and not c_doc.ids: # memory errors are not fatal here c_dict = xmlparser.xmlDictCreate() if c_dict: c_doc.ids = tree.xmlHashCreateDict(0, c_dict) xmlparser.xmlDictFree(c_dict) else: c_doc.ids = tree.xmlHashCreate(0) else: c_ctxt.loadsubset |= xmlparser.XML_SKIP_IDS if c_doc and c_doc.ids and not tree.xmlHashSize(c_doc.ids): # already initialised but empty => clear tree.xmlHashFree(c_doc.ids, NULL) c_doc.ids = NULL ############################################################ ## ET feed parser ############################################################ cdef class _FeedParser(_BaseParser): cdef bint _feed_parser_running @property def feed_error_log(self): """The error log of the last (or current) run of the feed parser. Note that this is local to the feed parser and thus is different from what the ``error_log`` property returns. """ return self._getPushParserContext()._error_log.copy() cpdef feed(self, data): u"""feed(self, data) Feeds data to the parser. The argument should be an 8-bit string buffer containing encoded data, although Unicode is supported as long as both string types are not mixed. This is the main entry point to the consumer interface of a parser. The parser will parse as much of the XML stream as it can on each call. To finish parsing or to reset the parser, call the ``close()`` method. Both methods may raise ParseError if errors occur in the input data. If an error is raised, there is no longer a need to call ``close()``. The feed parser interface is independent of the normal parser usage. You can use the same parser as a feed parser and in the ``parse()`` function concurrently. """ cdef _ParserContext context cdef bytes bstring cdef xmlparser.xmlParserCtxt* pctxt cdef Py_ssize_t py_buffer_len, ustart cdef const_char* char_data cdef const_char* c_encoding cdef int buffer_len cdef int error cdef bint recover = self._parse_options & xmlparser.XML_PARSE_RECOVER if isinstance(data, bytes): if self._default_encoding is None: c_encoding = NULL else: c_encoding = self._default_encoding char_data = _cstr(data) py_buffer_len = python.PyBytes_GET_SIZE(data) ustart = 0 elif isinstance(data, unicode): c_encoding = b"UTF-8" char_data = NULL py_buffer_len = len(<unicode> data) ustart = 0 else: raise TypeError, u"Parsing requires string data" context = self._getPushParserContext() pctxt = context._c_ctxt error = 0 if not self._feed_parser_running: context.prepare(set_document_loader=False) self._feed_parser_running = 1 c_filename = (_cstr(self._filename) if self._filename is not None else NULL) # We have to give *mlCtxtResetPush() enough input to figure # out the character encoding (at least four bytes), # however if we give it all we got, we'll have nothing for # *mlParseChunk() and things go wrong. buffer_len = 0 if char_data is not NULL: buffer_len = 4 if py_buffer_len > 4 else <int>py_buffer_len orig_loader = _register_document_loader() if self._for_html: error = _htmlCtxtResetPush( pctxt, char_data, buffer_len, c_filename, c_encoding, self._parse_options) else: xmlparser.xmlCtxtUseOptions(pctxt, self._parse_options) error = xmlparser.xmlCtxtResetPush( pctxt, char_data, buffer_len, c_filename, c_encoding) _reset_document_loader(orig_loader) py_buffer_len -= buffer_len char_data += buffer_len if error: raise MemoryError() __GLOBAL_PARSER_CONTEXT.initParserDict(pctxt) #print pctxt.charset, 'NONE' if c_encoding is NULL else c_encoding fixup_error = 0 while py_buffer_len > 0 and (error == 0 or recover): if char_data is NULL: # Unicode parsing by converting chunks to UTF-8 buffer_len = 2**19 # len(bytes) <= 4 * (2**19) == 2 MiB bstring = (<unicode> data)[ustart : ustart+buffer_len].encode('UTF-8') ustart += buffer_len py_buffer_len -= buffer_len # may end up < 0 error, fixup_error = _parse_data_chunk(pctxt, <const char*> bstring, <int> len(bstring)) else: # Direct byte string parsing. buffer_len = <int>py_buffer_len if py_buffer_len <= limits.INT_MAX else limits.INT_MAX error, fixup_error = _parse_data_chunk(pctxt, char_data, buffer_len) py_buffer_len -= buffer_len char_data += buffer_len if fixup_error: context.store_exception(MemoryError()) if context._has_raised(): # propagate Python exceptions immediately recover = 0 error = 1 break if error and not pctxt.replaceEntities and not pctxt.validate: # in this mode, we ignore errors about undefined entities for entry in context._error_log.filter_from_errors(): if entry.type != ErrorTypes.WAR_UNDECLARED_ENTITY and \ entry.type != ErrorTypes.ERR_UNDECLARED_ENTITY: break else: error = 0 if not pctxt.wellFormed and pctxt.disableSAX and context._has_raised(): # propagate Python exceptions immediately recover = 0 error = 1 if fixup_error or not recover and (error or not pctxt.wellFormed): self._feed_parser_running = 0 try: context._handleParseResult(self, pctxt.myDoc, None) finally: context.cleanup() cpdef close(self): u"""close(self) Terminates feeding data to this parser. This tells the parser to process any remaining data in the feed buffer, and then returns the root Element of the tree that was parsed. This method must be called after passing the last chunk of data into the ``feed()`` method. It should only be called when using the feed parser interface, all other usage is undefined. """ if not self._feed_parser_running: raise XMLSyntaxError(u"no element found", xmlerror.XML_ERR_INTERNAL_ERROR, 0, 0, self._filename) context = self._getPushParserContext() pctxt = context._c_ctxt self._feed_parser_running = 0 if self._for_html: htmlparser.htmlParseChunk(pctxt, NULL, 0, 1) else: xmlparser.xmlParseChunk(pctxt, NULL, 0, 1) if (pctxt.recovery and not pctxt.disableSAX and isinstance(context, _SaxParserContext)): # apply any left-over 'end' events (<_SaxParserContext>context).flushEvents() try: result = context._handleParseResult(self, pctxt.myDoc, None) finally: context.cleanup() if isinstance(result, _Document): return (<_Document>result).getroot() else: return result cdef (int, int) _parse_data_chunk(xmlparser.xmlParserCtxt* c_ctxt, const char* char_data, int buffer_len): fixup_error = 0 with nogil: if c_ctxt.html: c_node = c_ctxt.node # last node where the parser stopped orig_loader = _register_document_loader() error = htmlparser.htmlParseChunk(c_ctxt, char_data, buffer_len, 0) _reset_document_loader(orig_loader) # and now for the fun part: move node names to the dict if c_ctxt.myDoc: fixup_error = _fixHtmlDictSubtreeNames( c_ctxt.dict, c_ctxt.myDoc, c_node) if c_ctxt.myDoc.dict and c_ctxt.myDoc.dict is not c_ctxt.dict: xmlparser.xmlDictFree(c_ctxt.myDoc.dict) c_ctxt.myDoc.dict = c_ctxt.dict xmlparser.xmlDictReference(c_ctxt.dict) else: orig_loader = _register_document_loader() error = xmlparser.xmlParseChunk(c_ctxt, char_data, buffer_len, 0) _reset_document_loader(orig_loader) return (error, fixup_error) cdef int _htmlCtxtResetPush(xmlparser.xmlParserCtxt* c_ctxt, const_char* c_data, int buffer_len, const_char* c_filename, const_char* c_encoding, int parse_options) except -1: cdef xmlparser.xmlParserInput* c_input_stream # libxml2 lacks an HTML push parser setup function error = xmlparser.xmlCtxtResetPush( c_ctxt, c_data, buffer_len, c_filename, c_encoding) if error: return error # fix libxml2 setup for HTML c_ctxt.progressive = 1 c_ctxt.html = 1 htmlparser.htmlCtxtUseOptions(c_ctxt, parse_options) return 0 ############################################################ ## XML parser ############################################################ cdef int _XML_DEFAULT_PARSE_OPTIONS _XML_DEFAULT_PARSE_OPTIONS = ( xmlparser.XML_PARSE_NOENT | xmlparser.XML_PARSE_NOCDATA | xmlparser.XML_PARSE_NONET | xmlparser.XML_PARSE_COMPACT | xmlparser.XML_PARSE_BIG_LINES ) cdef class XMLParser(_FeedParser): u"""XMLParser(self, encoding=None, attribute_defaults=False, dtd_validation=False, load_dtd=False, no_network=True, ns_clean=False, recover=False, schema: XMLSchema =None, huge_tree=False, remove_blank_text=False, resolve_entities=True, remove_comments=False, remove_pis=False, strip_cdata=True, collect_ids=True, target=None, compact=True) The XML parser. Parsers can be supplied as additional argument to various parse functions of the lxml API. A default parser is always available and can be replaced by a call to the global function 'set_default_parser'. New parsers can be created at any time without a major run-time overhead. The keyword arguments in the constructor are mainly based on the libxml2 parser configuration. A DTD will also be loaded if DTD validation or attribute default values are requested (unless you additionally provide an XMLSchema from which the default attributes can be read). Available boolean keyword arguments: - attribute_defaults - inject default attributes from DTD or XMLSchema - dtd_validation - validate against a DTD referenced by the document - load_dtd - use DTD for parsing - no_network - prevent network access for related files (default: True) - ns_clean - clean up redundant namespace declarations - recover - try hard to parse through broken XML - remove_blank_text - discard blank text nodes that appear ignorable - remove_comments - discard comments - remove_pis - discard processing instructions - strip_cdata - replace CDATA sections by normal text content (default: True) - compact - save memory for short text content (default: True) - collect_ids - use a hash table of XML IDs for fast access (default: True, always True with DTD validation) - resolve_entities - replace entities by their text value (default: True) - huge_tree - disable security restrictions and support very deep trees and very long text content (only affects libxml2 2.7+) Other keyword arguments: - encoding - override the document encoding - target - a parser target object that will receive the parse events - schema - an XMLSchema to validate against Note that you should avoid sharing parsers between threads. While this is not harmful, it is more efficient to use separate parsers. This does not apply to the default parser. """ def __init__(self, *, encoding=None, attribute_defaults=False, dtd_validation=False, load_dtd=False, no_network=True, ns_clean=False, recover=False, XMLSchema schema=None, huge_tree=False, remove_blank_text=False, resolve_entities=True, remove_comments=False, remove_pis=False, strip_cdata=True, collect_ids=True, target=None, compact=True): cdef int parse_options parse_options = _XML_DEFAULT_PARSE_OPTIONS if load_dtd: parse_options = parse_options | xmlparser.XML_PARSE_DTDLOAD if dtd_validation: parse_options = parse_options | xmlparser.XML_PARSE_DTDVALID | \ xmlparser.XML_PARSE_DTDLOAD if attribute_defaults: parse_options = parse_options | xmlparser.XML_PARSE_DTDATTR if schema is None: parse_options = parse_options | xmlparser.XML_PARSE_DTDLOAD if ns_clean: parse_options = parse_options | xmlparser.XML_PARSE_NSCLEAN if recover: parse_options = parse_options | xmlparser.XML_PARSE_RECOVER if remove_blank_text: parse_options = parse_options | xmlparser.XML_PARSE_NOBLANKS if huge_tree: parse_options = parse_options | xmlparser.XML_PARSE_HUGE if not no_network: parse_options = parse_options ^ xmlparser.XML_PARSE_NONET if not compact: parse_options = parse_options ^ xmlparser.XML_PARSE_COMPACT if not resolve_entities: parse_options = parse_options ^ xmlparser.XML_PARSE_NOENT if not strip_cdata: parse_options = parse_options ^ xmlparser.XML_PARSE_NOCDATA _BaseParser.__init__(self, parse_options, 0, schema, remove_comments, remove_pis, strip_cdata, collect_ids, target, encoding) cdef class XMLPullParser(XMLParser): """XMLPullParser(self, events=None, *, tag=None, **kwargs) XML parser that collects parse events in an iterator. The collected events are the same as for iterparse(), but the parser itself is non-blocking in the sense that it receives data chunks incrementally through its .feed() method, instead of reading them directly from a file(-like) object all by itself. By default, it collects Element end events. To change that, pass any subset of the available events into the ``events`` argument: ``'start'``, ``'end'``, ``'start-ns'``, ``'end-ns'``, ``'comment'``, ``'pi'``. To support loading external dependencies relative to the input source, you can pass the ``base_url``. """ def __init__(self, events=None, *, tag=None, base_url=None, **kwargs): XMLParser.__init__(self, **kwargs) if events is None: events = ('end',) self._setBaseURL(base_url) self._collectEvents(events, tag) def read_events(self): return (<_SaxParserContext?>self._getPushParserContext()).events_iterator cdef class ETCompatXMLParser(XMLParser): u"""ETCompatXMLParser(self, encoding=None, attribute_defaults=False, \ dtd_validation=False, load_dtd=False, no_network=True, \ ns_clean=False, recover=False, schema=None, \ huge_tree=False, remove_blank_text=False, resolve_entities=True, \ remove_comments=True, remove_pis=True, strip_cdata=True, \ target=None, compact=True) An XML parser with an ElementTree compatible default setup. See the XMLParser class for details. This parser has ``remove_comments`` and ``remove_pis`` enabled by default and thus ignores comments and processing instructions. """ def __init__(self, *, encoding=None, attribute_defaults=False, dtd_validation=False, load_dtd=False, no_network=True, ns_clean=False, recover=False, schema=None, huge_tree=False, remove_blank_text=False, resolve_entities=True, remove_comments=True, remove_pis=True, strip_cdata=True, target=None, compact=True): XMLParser.__init__(self, attribute_defaults=attribute_defaults, dtd_validation=dtd_validation, load_dtd=load_dtd, no_network=no_network, ns_clean=ns_clean, recover=recover, remove_blank_text=remove_blank_text, huge_tree=huge_tree, compact=compact, resolve_entities=resolve_entities, remove_comments=remove_comments, remove_pis=remove_pis, strip_cdata=strip_cdata, target=target, encoding=encoding, schema=schema) # ET 1.2 compatible name XMLTreeBuilder = ETCompatXMLParser cdef XMLParser __DEFAULT_XML_PARSER __DEFAULT_XML_PARSER = XMLParser() __GLOBAL_PARSER_CONTEXT.setDefaultParser(__DEFAULT_XML_PARSER) def set_default_parser(_BaseParser parser=None): u"""set_default_parser(parser=None) Set a default parser for the current thread. This parser is used globally whenever no parser is supplied to the various parse functions of the lxml API. If this function is called without a parser (or if it is None), the default parser is reset to the original configuration. Note that the pre-installed default parser is not thread-safe. Avoid the default parser in multi-threaded environments. You can create a separate parser for each thread explicitly or use a parser pool. """ if parser is None: parser = __DEFAULT_XML_PARSER __GLOBAL_PARSER_CONTEXT.setDefaultParser(parser) def get_default_parser(): u"get_default_parser()" return __GLOBAL_PARSER_CONTEXT.getDefaultParser() ############################################################ ## HTML parser ############################################################ cdef int _HTML_DEFAULT_PARSE_OPTIONS _HTML_DEFAULT_PARSE_OPTIONS = ( htmlparser.HTML_PARSE_RECOVER | htmlparser.HTML_PARSE_NONET | htmlparser.HTML_PARSE_COMPACT ) cdef class HTMLParser(_FeedParser): u"""HTMLParser(self, encoding=None, remove_blank_text=False, \ remove_comments=False, remove_pis=False, strip_cdata=True, \ no_network=True, target=None, schema: XMLSchema =None, \ recover=True, compact=True, collect_ids=True, huge_tree=False) The HTML parser. This parser allows reading HTML into a normal XML tree. By default, it can read broken (non well-formed) HTML, depending on the capabilities of libxml2. Use the 'recover' option to switch this off. Available boolean keyword arguments: - recover - try hard to parse through broken HTML (default: True) - no_network - prevent network access for related files (default: True) - remove_blank_text - discard empty text nodes that are ignorable (i.e. not actual text content) - remove_comments - discard comments - remove_pis - discard processing instructions - strip_cdata - replace CDATA sections by normal text content (default: True) - compact - save memory for short text content (default: True) - default_doctype - add a default doctype even if it is not found in the HTML (default: True) - collect_ids - use a hash table of XML IDs for fast access (default: True) - huge_tree - disable security restrictions and support very deep trees and very long text content (only affects libxml2 2.7+) Other keyword arguments: - encoding - override the document encoding - target - a parser target object that will receive the parse events - schema - an XMLSchema to validate against Note that you should avoid sharing parsers between threads for performance reasons. """ def __init__(self, *, encoding=None, remove_blank_text=False, remove_comments=False, remove_pis=False, strip_cdata=True, no_network=True, target=None, XMLSchema schema=None, recover=True, compact=True, default_doctype=True, collect_ids=True, huge_tree=False): cdef int parse_options parse_options = _HTML_DEFAULT_PARSE_OPTIONS if remove_blank_text: parse_options = parse_options | htmlparser.HTML_PARSE_NOBLANKS if not recover: parse_options = parse_options ^ htmlparser.HTML_PARSE_RECOVER if not no_network: parse_options = parse_options ^ htmlparser.HTML_PARSE_NONET if not compact: parse_options = parse_options ^ htmlparser.HTML_PARSE_COMPACT if not default_doctype: parse_options = parse_options ^ htmlparser.HTML_PARSE_NODEFDTD if huge_tree: parse_options = parse_options | xmlparser.XML_PARSE_HUGE _BaseParser.__init__(self, parse_options, 1, schema, remove_comments, remove_pis, strip_cdata, collect_ids, target, encoding) cdef HTMLParser __DEFAULT_HTML_PARSER __DEFAULT_HTML_PARSER = HTMLParser() cdef class HTMLPullParser(HTMLParser): """HTMLPullParser(self, events=None, *, tag=None, base_url=None, **kwargs) HTML parser that collects parse events in an iterator. The collected events are the same as for iterparse(), but the parser itself is non-blocking in the sense that it receives data chunks incrementally through its .feed() method, instead of reading them directly from a file(-like) object all by itself. By default, it collects Element end events. To change that, pass any subset of the available events into the ``events`` argument: ``'start'``, ``'end'``, ``'start-ns'``, ``'end-ns'``, ``'comment'``, ``'pi'``. To support loading external dependencies relative to the input source, you can pass the ``base_url``. """ def __init__(self, events=None, *, tag=None, base_url=None, **kwargs): HTMLParser.__init__(self, **kwargs) if events is None: events = ('end',) self._setBaseURL(base_url) self._collectEvents(events, tag) def read_events(self): return (<_SaxParserContext?>self._getPushParserContext()).events_iterator ############################################################ ## helper functions for document creation ############################################################ cdef xmlDoc* _parseDoc(text, filename, _BaseParser parser) except NULL: cdef char* c_filename cdef char* c_text cdef Py_ssize_t c_len cdef bint is_pep393_string if parser is None: parser = __GLOBAL_PARSER_CONTEXT.getDefaultParser() if not filename: c_filename = NULL else: filename_utf = _encodeFilenameUTF8(filename) c_filename = _cstr(filename_utf) if isinstance(text, unicode): is_pep393_string = ( python.PEP393_ENABLED and python.PyUnicode_IS_READY(text)) if is_pep393_string: c_len = python.PyUnicode_GET_LENGTH(text) * python.PyUnicode_KIND(text) else: c_len = python.PyUnicode_GET_DATA_SIZE(text) if c_len > limits.INT_MAX: return (<_BaseParser>parser)._parseDocFromFilelike( StringIO(text), filename, None) if _PY_UNICODE_ENCODING is NULL and not is_pep393_string: text = (<unicode>text).encode('utf8') return (<_BaseParser>parser)._parseDocFromFilelike( BytesIO(text), filename, "UTF-8") return (<_BaseParser>parser)._parseUnicodeDoc(text, c_filename) else: c_len = python.PyBytes_GET_SIZE(text) if c_len > limits.INT_MAX: return (<_BaseParser>parser)._parseDocFromFilelike( BytesIO(text), filename, None) c_text = _cstr(text) return (<_BaseParser>parser)._parseDoc(c_text, c_len, c_filename) cdef xmlDoc* _parseDocFromFile(filename8, _BaseParser parser) except NULL: if parser is None: parser = __GLOBAL_PARSER_CONTEXT.getDefaultParser() return (<_BaseParser>parser)._parseDocFromFile(_cstr(filename8)) cdef xmlDoc* _parseDocFromFilelike(source, filename, _BaseParser parser) except NULL: if parser is None: parser = __GLOBAL_PARSER_CONTEXT.getDefaultParser() return (<_BaseParser>parser)._parseDocFromFilelike(source, filename, None) cdef xmlDoc* _newXMLDoc() except NULL: cdef xmlDoc* result result = tree.xmlNewDoc(NULL) if result is NULL: raise MemoryError() if result.encoding is NULL: result.encoding = tree.xmlStrdup(<unsigned char*>"UTF-8") __GLOBAL_PARSER_CONTEXT.initDocDict(result) return result cdef xmlDoc* _newHTMLDoc() except NULL: cdef xmlDoc* result result = tree.htmlNewDoc(NULL, NULL) if result is NULL: raise MemoryError() __GLOBAL_PARSER_CONTEXT.initDocDict(result) return result cdef xmlDoc* _copyDoc(xmlDoc* c_doc, int recursive) except NULL: cdef xmlDoc* result if recursive: with nogil: result = tree.xmlCopyDoc(c_doc, recursive) else: result = tree.xmlCopyDoc(c_doc, 0) if result is NULL: raise MemoryError() __GLOBAL_PARSER_CONTEXT.initDocDict(result) return result cdef xmlDoc* _copyDocRoot(xmlDoc* c_doc, xmlNode* c_new_root) except NULL: u"Recursively copy the document and make c_new_root the new root node." cdef xmlDoc* result cdef xmlNode* c_node result = tree.xmlCopyDoc(c_doc, 0) # non recursive __GLOBAL_PARSER_CONTEXT.initDocDict(result) with nogil: c_node = tree.xmlDocCopyNode(c_new_root, result, 1) # recursive if c_node is NULL: raise MemoryError() tree.xmlDocSetRootElement(result, c_node) _copyTail(c_new_root.next, c_node) return result cdef xmlNode* _copyNodeToDoc(xmlNode* c_node, xmlDoc* c_doc) except NULL: u"Recursively copy the element into the document. c_doc is not modified." cdef xmlNode* c_root c_root = tree.xmlDocCopyNode(c_node, c_doc, 1) # recursive if c_root is NULL: raise MemoryError() _copyTail(c_node.next, c_root) return c_root ############################################################ ## API level helper functions for _Document creation ############################################################ cdef _Document _parseDocument(source, _BaseParser parser, base_url): cdef _Document doc source = _getFSPathOrObject(source) if _isString(source): # parse the file directly from the filesystem doc = _parseDocumentFromURL(_encodeFilename(source), parser) # fix base URL if requested if base_url is not None: base_url = _encodeFilenameUTF8(base_url) if doc._c_doc.URL is not NULL: tree.xmlFree(<char*>doc._c_doc.URL) doc._c_doc.URL = tree.xmlStrdup(_xcstr(base_url)) return doc if base_url is not None: url = base_url else: url = _getFilenameForFile(source) if hasattr(source, u'getvalue') and hasattr(source, u'tell'): # StringIO - reading from start? if source.tell() == 0: return _parseMemoryDocument(source.getvalue(), url, parser) # Support for file-like objects (urlgrabber.urlopen, ...) if hasattr(source, u'read'): return _parseFilelikeDocument(source, url, parser) raise TypeError, f"cannot parse from '{python._fqtypename(source).decode('UTF-8')}'" cdef _Document _parseDocumentFromURL(url, _BaseParser parser): c_doc = _parseDocFromFile(url, parser) return _documentFactory(c_doc, parser) cdef _Document _parseMemoryDocument(text, url, _BaseParser parser): if isinstance(text, unicode): if _hasEncodingDeclaration(text): raise ValueError( u"Unicode strings with encoding declaration are not supported. " u"Please use bytes input or XML fragments without declaration.") elif not isinstance(text, bytes): raise ValueError, u"can only parse strings" c_doc = _parseDoc(text, url, parser) return _documentFactory(c_doc, parser) cdef _Document _parseFilelikeDocument(source, url, _BaseParser parser): c_doc = _parseDocFromFilelike(source, url, parser) return _documentFactory(c_doc, parser)
Back to File Manager