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# 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 int initMainParserContext(self) except -1:
"""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)["_ParserDictionaryContext"] = self
cdef _ParserDictionaryContext _findThreadParserContext(self):
"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, "_ParserDictionaryContext")
if result is not NULL:
return <object>result
context = <_ParserDictionaryContext>_ParserDictionaryContext.__new__(_ParserDictionaryContext)
d["_ParserDictionaryContext"] = context
return context
cdef int setDefaultParser(self, _BaseParser parser) except -1:
"Set the default parser for the current thread"
cdef _ParserDictionaryContext context
context = self._findThreadParserContext()
context._default_parser = parser
cdef _BaseParser getDefaultParser(self):
"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):
"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 int initThreadDictRef(self, tree.xmlDict** c_dict_ref) except -1:
c_dict = c_dict_ref[0]
c_thread_dict = self._getThreadDict(c_dict)
if c_dict is c_thread_dict:
return 0
if c_dict is not NULL:
xmlparser.xmlDictFree(c_dict)
c_dict_ref[0] = c_thread_dict
xmlparser.xmlDictReference(c_thread_dict)
cdef int initParserDict(self, xmlparser.xmlParserCtxt* pctxt) except -1:
"Assure we always use the same string dictionary."
self.initThreadDictRef(&pctxt.dict)
pctxt.dictNames = 1
cdef int initXPathParserDict(self, xpath.xmlXPathContext* pctxt) except -1:
"Assure we always use the same string dictionary."
self.initThreadDictRef(&pctxt.dict)
cdef int initDocDict(self, xmlDoc* result) except -1:
"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):
"""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 int pushImpliedContextFromParser(self, _BaseParser parser) except -1:
"Push a new implied context object taken from the parser."
if parser is not None:
self.pushImpliedContext(parser._getParserContext())
else:
self.pushImpliedContext(None)
cdef int pushImpliedContext(self, _ParserContext parser_context) except -1:
"Push a new implied context object."
cdef _ParserDictionaryContext context
context = self._findThreadParserContext()
context._implied_parser_contexts.append(parser_context)
cdef int popImpliedContext(self) except -1:
"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:
"""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):
"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> b'\xFF' and
buffer[1] == <const_xmlChar> b'\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)
# Python 3.12 removed support for "Py_UNICODE".
if python.PY_VERSION_HEX < 0x030C0000:
_setupPythonUnicode()
cdef unicode _find_PyUCS4EncodingName():
"""
Find a suitable encoding for Py_UCS4 PyUnicode strings in libxml2.
"""
ustring = "<xml>\U0001F92A</xml>"
cdef const xmlChar* buffer = <const xmlChar*> python.PyUnicode_DATA(ustring)
cdef Py_ssize_t py_buffer_len = python.PyUnicode_GET_LENGTH(ustring)
encoding_name = ''
cdef tree.xmlCharEncoding enc = tree.xmlDetectCharEncoding(buffer, py_buffer_len)
enchandler = tree.xmlGetCharEncodingHandler(enc)
if enchandler is not NULL:
try:
if enchandler.name:
encoding_name = enchandler.name.decode('UTF-8')
finally:
tree.xmlCharEncCloseFunc(enchandler)
else:
c_name = tree.xmlGetCharEncodingName(enc)
if c_name:
encoding_name = c_name.decode('UTF-8')
if encoding_name and not encoding_name.endswith('LE') and not encoding_name.endswith('BE'):
encoding_name += 'BE' if python.PY_BIG_ENDIAN else 'LE'
return encoding_name or None
_pyucs4_encoding_name = _find_PyUCS4EncodingName()
############################################################
## 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) noexcept:
cdef xmlparser.xmlParserInputBuffer* c_buffer = xmlparser.xmlAllocParserInputBuffer(0)
if c_buffer:
c_buffer.readcallback = _readFilelikeParser
c_buffer.context = <python.PyObject*> self
return c_buffer
cdef xmlparser.xmlParserInput* _createParserInput(
self, xmlparser.xmlParserCtxt* ctxt) noexcept:
cdef xmlparser.xmlParserInputBuffer* c_buffer = self._createParserInputBuffer()
if not c_buffer:
return NULL
return xmlparser.xmlNewIOInputStream(ctxt, c_buffer, 0)
cdef tree.xmlDtd* _readDtd(self) noexcept:
cdef xmlparser.xmlParserInputBuffer* c_buffer = self._createParserInputBuffer()
if not c_buffer:
return NULL
with nogil:
return xmlparser.xmlIOParseDTD(NULL, c_buffer, 0)
cdef xmlDoc* _readDoc(self, xmlparser.xmlParserCtxt* ctxt, int options) noexcept:
cdef xmlDoc* result
cdef void* c_callback_context = <python.PyObject*> self
cdef char* c_encoding = _cstr(self._encoding) if self._encoding is not None else NULL
orig_options = ctxt.options
with nogil:
if ctxt.html:
result = htmlparser.htmlCtxtReadIO(
ctxt, _readFilelikeParser, 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, _readFilelikeParser, 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) noexcept:
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, \
"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) noexcept with gil:
return (<_FileReaderContext>ctxt).copyToBuffer(c_buffer, c_size)
cdef int _readFileParser(void* ctxt, char* c_buffer, int c_size) noexcept 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) noexcept 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() noexcept nogil:
cdef xmlparser.xmlExternalEntityLoader old = xmlparser.xmlGetExternalEntityLoader()
xmlparser.xmlSetExternalEntityLoader(<xmlparser.xmlExternalEntityLoader>_local_resolver)
return old
cdef void _reset_document_loader(xmlparser.xmlExternalEntityLoader old) noexcept 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) noexcept:
self._c_ctxt = c_ctxt
c_ctxt._private = <void*>self
cdef void _resetParserContext(self) noexcept:
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, "parser locking failed"
self._error_log.clear()
self._doc = None
# Need a cast here because older libxml2 releases do not use 'const' in the functype.
self._c_ctxt.sax.serror = <xmlerror.xmlStructuredErrorFunc> _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, const xmlerror.xmlError* error) noexcept with gil:
(<_ParserContext>_parser_context._private)._error_log._receive(error)
cdef void _receiveParserError(void* c_context, const xmlerror.xmlError* error) noexcept 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, "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. This is fixed in libxml2 2.12.
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) noexcept 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) noexcept 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) noexcept 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 bint _resolve_external_entities
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, bint resolve_external_entities=True):
cdef tree.xmlCharEncodingHandler* enchandler
cdef int c_encoding
if not isinstance(self, (XMLParser, HTMLParser)):
raise TypeError, "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._resolve_external_entities = resolve_external_entities
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
if not self._resolve_external_entities:
pctxt.sax.getEntity = _getInternalEntityOnly
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
# Need a cast here because older libxml2 releases do not use 'const' in the functype.
sax.serror = <xmlerror.xmlStructuredErrorFunc> _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 "libxml2 %d.%d.%d" % LIBXML_VERSION
def set_element_class_lookup(self, ElementClassLookup lookup = None):
"""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):
"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):
"""copy(self)
Create a new parser with the same configuration.
"""
return self._copy()
def makeelement(self, _tag, attrib=None, nsmap=None, **_extra):
"""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:
"""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
if python.PyUnicode_IS_READY(utext):
# PEP-393 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:
if python.PyUnicode_MAX_CHAR_VALUE(utext) <= 127:
c_encoding = 'UTF-8'
else:
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 = 'UTF-32BE' # actually UCS-4
else:
c_encoding = 'UTF-32LE' # actually UCS-4
else:
assert False, f"Illegal Unicode kind {c_kind}"
else:
# old Py_UNICODE string
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:
"""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] == b'\xFF' and c_text[1] == b'\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] == b'\xFE' and c_text[3] == b'\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 tree.xmlEntity* _getInternalEntityOnly(void* ctxt, const_xmlChar* name) noexcept nogil:
"""
Callback function to intercept the entity resolution when external entity loading is disabled.
"""
cdef tree.xmlEntity* entity = xmlparser.xmlSAX2GetEntity(ctxt, name)
if not entity:
return NULL
if entity.etype not in (
tree.xmlEntityType.XML_EXTERNAL_GENERAL_PARSED_ENTITY,
tree.xmlEntityType.XML_EXTERNAL_GENERAL_UNPARSED_ENTITY,
tree.xmlEntityType.XML_EXTERNAL_PARAMETER_ENTITY):
return entity
# Reject all external entities and fail the parsing instead. There is currently
# no way in libxml2 to just prevent the entity resolution in this case.
cdef xmlerror.xmlError c_error
cdef xmlerror.xmlStructuredErrorFunc err_func
cdef xmlparser.xmlParserInput* parser_input
cdef void* err_context
c_ctxt = <xmlparser.xmlParserCtxt *> ctxt
err_func = xmlerror.xmlStructuredError
if err_func:
parser_input = c_ctxt.input
# Copied from xmlVErrParser() in libxml2: get current input from stack.
if parser_input and parser_input.filename is NULL and c_ctxt.inputNr > 1:
parser_input = c_ctxt.inputTab[c_ctxt.inputNr - 2]
c_error = xmlerror.xmlError(
domain=xmlerror.xmlErrorDomain.XML_FROM_PARSER,
code=xmlerror.xmlParserErrors.XML_ERR_EXT_ENTITY_STANDALONE,
level=xmlerror.xmlErrorLevel.XML_ERR_FATAL,
message=b"External entity resolution is disabled for security reasons "
b"when resolving '&%s;'. Use 'XMLParser(resolve_entities=True)' "
b"if you consider it safe to enable it.",
file=parser_input.filename,
node=entity,
str1=<char*> name,
str2=NULL,
str3=NULL,
line=parser_input.line if parser_input else 0,
int1=0,
int2=parser_input.col if parser_input else 0,
)
err_context = xmlerror.xmlStructuredErrorContext
err_func(err_context, &c_error)
c_ctxt.wellFormed = 0
# The entity was looked up and does not need to be freed.
return NULL
cdef void _initSaxDocument(void* ctxt) noexcept 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):
"""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, "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):
"""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("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):
"""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)
- huge_tree - disable security restrictions and support very deep trees
and very long text content (only affects libxml2 2.7+)
Other keyword arguments:
- resolve_entities - replace entities by their text value: False for keeping the
entity references, True for resolving them, and 'internal' for resolving
internal definitions only (no external file/URL access).
The default used to be True and was changed to 'internal' in lxml 5.0.
- encoding - override the document encoding (note: libiconv encoding name)
- 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='internal',
remove_comments=False, remove_pis=False, strip_cdata=True,
collect_ids=True, target=None, compact=True):
cdef int parse_options
cdef bint resolve_external = True
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
elif resolve_entities == 'internal':
resolve_external = False
if not strip_cdata:
parse_options = parse_options ^ xmlparser.XML_PARSE_NOCDATA
_BaseParser.__init__(self, parse_options, False, schema,
remove_comments, remove_pis, strip_cdata,
collect_ids, target, encoding, resolve_external)
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):
"""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):
"""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():
"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):
"""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 (note: libiconv encoding name)
- 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, True, 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
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):
if python.PyUnicode_IS_READY(text):
# PEP-393 Unicode string
c_len = python.PyUnicode_GET_LENGTH(text) * python.PyUnicode_KIND(text)
else:
# old Py_UNICODE string
c_len = python.PyUnicode_GET_DATA_SIZE(text)
if c_len > limits.INT_MAX:
return (<_BaseParser>parser)._parseDocFromFilelike(
StringIO(text), filename, None)
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:
"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:
"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, 'getvalue') and hasattr(source, '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, '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(
"Unicode strings with encoding declaration are not supported. "
"Please use bytes input or XML fragments without declaration.")
elif not isinstance(text, bytes):
raise ValueError, "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)