# XSLT
from lxml.includes cimport xslt
cdef class XSLTError(LxmlError):
"""Base class of all XSLT errors.
"""
cdef class XSLTParseError(XSLTError):
"""Error parsing a stylesheet document.
"""
cdef class XSLTApplyError(XSLTError):
"""Error running an XSL transformation.
"""
class XSLTSaveError(XSLTError, SerialisationError):
"""Error serialising an XSLT result.
"""
cdef class XSLTExtensionError(XSLTError):
"""Error registering an XSLT extension.
"""
# version information
LIBXSLT_COMPILED_VERSION = __unpackIntVersion(xslt.LIBXSLT_VERSION)
LIBXSLT_VERSION = __unpackIntVersion(xslt.xsltLibxsltVersion)
################################################################################
# Where do we store what?
#
# xsltStylesheet->doc->_private
# == _XSLTResolverContext for XSL stylesheet
#
# xsltTransformContext->_private
# == _XSLTResolverContext for transformed document
#
################################################################################
################################################################################
# XSLT document loaders
@cython.final
@cython.internal
cdef class _XSLTResolverContext(_ResolverContext):
cdef xmlDoc* _c_style_doc
cdef _BaseParser _parser
cdef _XSLTResolverContext _copy(self):
cdef _XSLTResolverContext context
context = _XSLTResolverContext()
_initXSLTResolverContext(context, self._parser)
context._c_style_doc = self._c_style_doc
return context
cdef _initXSLTResolverContext(_XSLTResolverContext context,
_BaseParser parser):
_initResolverContext(context, parser.resolvers)
context._parser = parser
context._c_style_doc = NULL
cdef xmlDoc* _xslt_resolve_from_python(const_xmlChar* c_uri, void* c_context,
int parse_options, int* error) with gil:
# call the Python document loaders
cdef _XSLTResolverContext context
cdef _ResolverRegistry resolvers
cdef _InputDocument doc_ref
cdef xmlDoc* c_doc
cdef xmlDoc* c_return_doc = NULL
error[0] = 0
context = <_XSLTResolverContext>c_context
# shortcut if we resolve the stylesheet itself
c_doc = context._c_style_doc
try:
if c_doc is not NULL and c_doc.URL is not NULL:
if tree.xmlStrcmp(c_uri, c_doc.URL) == 0:
c_return_doc = _copyDoc(c_doc, 1)
return c_return_doc # 'goto', see 'finally' below
# delegate to the Python resolvers
resolvers = context._resolvers
if tree.xmlStrncmp(<unsigned char*>'string://__STRING__XSLT__/', c_uri, 26) == 0:
c_uri += 26
uri = _decodeFilename(c_uri)
doc_ref = resolvers.resolve(uri, None, context)
if doc_ref is not None:
if doc_ref._type == PARSER_DATA_STRING:
c_return_doc = _parseDoc(
doc_ref._data_bytes, doc_ref._filename, context._parser)
elif doc_ref._type == PARSER_DATA_FILENAME:
c_return_doc = _parseDocFromFile(
doc_ref._filename, context._parser)
elif doc_ref._type == PARSER_DATA_FILE:
c_return_doc = _parseDocFromFilelike(
doc_ref._file, doc_ref._filename, context._parser)
elif doc_ref._type == PARSER_DATA_EMPTY:
c_return_doc = _newXMLDoc()
if c_return_doc is not NULL and c_return_doc.URL is NULL:
c_return_doc.URL = tree.xmlStrdup(c_uri)
except:
error[0] = 1
context._store_raised()
finally:
return c_return_doc # and swallow any further exceptions
cdef void _xslt_store_resolver_exception(const_xmlChar* c_uri, void* context,
xslt.xsltLoadType c_type) with gil:
try:
message = f"Cannot resolve URI {_decodeFilename(c_uri)}"
if c_type == xslt.XSLT_LOAD_DOCUMENT:
exception = XSLTApplyError(message)
else:
exception = XSLTParseError(message)
(<_XSLTResolverContext>context)._store_exception(exception)
except BaseException as e:
(<_XSLTResolverContext>context)._store_exception(e)
finally:
return # and swallow any further exceptions
cdef xmlDoc* _xslt_doc_loader(const_xmlChar* c_uri, tree.xmlDict* c_dict,
int parse_options, void* c_ctxt,
xslt.xsltLoadType c_type) nogil:
# nogil => no Python objects here, may be called without thread context !
cdef xmlDoc* c_doc
cdef xmlDoc* result
cdef void* c_pcontext
cdef int error = 0
# find resolver contexts of stylesheet and transformed doc
if c_type == xslt.XSLT_LOAD_DOCUMENT:
# transformation time
c_pcontext = (<xslt.xsltTransformContext*>c_ctxt)._private
elif c_type == xslt.XSLT_LOAD_STYLESHEET:
# include/import resolution while parsing
c_pcontext = (<xslt.xsltStylesheet*>c_ctxt).doc._private
else:
c_pcontext = NULL
if c_pcontext is NULL:
# can't call Python without context, fall back to default loader
return XSLT_DOC_DEFAULT_LOADER(
c_uri, c_dict, parse_options, c_ctxt, c_type)
c_doc = _xslt_resolve_from_python(c_uri, c_pcontext, parse_options, &error)
if c_doc is NULL and not error:
c_doc = XSLT_DOC_DEFAULT_LOADER(
c_uri, c_dict, parse_options, c_ctxt, c_type)
if c_doc is NULL:
_xslt_store_resolver_exception(c_uri, c_pcontext, c_type)
if c_doc is not NULL and c_type == xslt.XSLT_LOAD_STYLESHEET:
c_doc._private = c_pcontext
return c_doc
cdef xslt.xsltDocLoaderFunc XSLT_DOC_DEFAULT_LOADER = xslt.xsltDocDefaultLoader
xslt.xsltSetLoaderFunc(<xslt.xsltDocLoaderFunc>_xslt_doc_loader)
################################################################################
# XSLT file/network access control
cdef class XSLTAccessControl:
u"""XSLTAccessControl(self, read_file=True, write_file=True, create_dir=True, read_network=True, write_network=True)
Access control for XSLT: reading/writing files, directories and
network I/O. Access to a type of resource is granted or denied by
passing any of the following boolean keyword arguments. All of
them default to True to allow access.
- read_file
- write_file
- create_dir
- read_network
- write_network
For convenience, there is also a class member `DENY_ALL` that
provides an XSLTAccessControl instance that is readily configured
to deny everything, and a `DENY_WRITE` member that denies all
write access but allows read access.
See `XSLT`.
"""
cdef xslt.xsltSecurityPrefs* _prefs
def __cinit__(self):
self._prefs = xslt.xsltNewSecurityPrefs()
if self._prefs is NULL:
raise MemoryError()
def __init__(self, *, bint read_file=True, bint write_file=True, bint create_dir=True,
bint read_network=True, bint write_network=True):
self._setAccess(xslt.XSLT_SECPREF_READ_FILE, read_file)
self._setAccess(xslt.XSLT_SECPREF_WRITE_FILE, write_file)
self._setAccess(xslt.XSLT_SECPREF_CREATE_DIRECTORY, create_dir)
self._setAccess(xslt.XSLT_SECPREF_READ_NETWORK, read_network)
self._setAccess(xslt.XSLT_SECPREF_WRITE_NETWORK, write_network)
DENY_ALL = XSLTAccessControl(
read_file=False, write_file=False, create_dir=False,
read_network=False, write_network=False)
DENY_WRITE = XSLTAccessControl(
read_file=True, write_file=False, create_dir=False,
read_network=True, write_network=False)
def __dealloc__(self):
if self._prefs is not NULL:
xslt.xsltFreeSecurityPrefs(self._prefs)
@cython.final
cdef _setAccess(self, xslt.xsltSecurityOption option, bint allow):
cdef xslt.xsltSecurityCheck function
if allow:
function = xslt.xsltSecurityAllow
else:
function = xslt.xsltSecurityForbid
xslt.xsltSetSecurityPrefs(self._prefs, option, function)
@cython.final
cdef void _register_in_context(self, xslt.xsltTransformContext* ctxt):
xslt.xsltSetCtxtSecurityPrefs(self._prefs, ctxt)
property options:
u"The access control configuration as a map of options."
def __get__(self):
return {
u'read_file': self._optval(xslt.XSLT_SECPREF_READ_FILE),
u'write_file': self._optval(xslt.XSLT_SECPREF_WRITE_FILE),
u'create_dir': self._optval(xslt.XSLT_SECPREF_CREATE_DIRECTORY),
u'read_network': self._optval(xslt.XSLT_SECPREF_READ_NETWORK),
u'write_network': self._optval(xslt.XSLT_SECPREF_WRITE_NETWORK),
}
@cython.final
cdef _optval(self, xslt.xsltSecurityOption option):
cdef xslt.xsltSecurityCheck function
function = xslt.xsltGetSecurityPrefs(self._prefs, option)
if function is <xslt.xsltSecurityCheck>xslt.xsltSecurityAllow:
return True
elif function is <xslt.xsltSecurityCheck>xslt.xsltSecurityForbid:
return False
else:
return None
def __repr__(self):
items = sorted(self.options.items())
return u"%s(%s)" % (
python._fqtypename(self).decode('UTF-8').split(u'.')[-1],
u', '.join([u"%s=%r" % item for item in items]))
################################################################################
# XSLT
cdef int _register_xslt_function(void* ctxt, name_utf, ns_utf):
if ns_utf is None:
return 0
# libxml2 internalises the strings if ctxt has a dict
return xslt.xsltRegisterExtFunction(
<xslt.xsltTransformContext*>ctxt, _xcstr(name_utf), _xcstr(ns_utf),
<xslt.xmlXPathFunction>_xpath_function_call)
cdef dict EMPTY_DICT = {}
@cython.final
@cython.internal
cdef class _XSLTContext(_BaseContext):
cdef xslt.xsltTransformContext* _xsltCtxt
cdef _ReadOnlyElementProxy _extension_element_proxy
cdef dict _extension_elements
def __cinit__(self):
self._xsltCtxt = NULL
self._extension_elements = EMPTY_DICT
def __init__(self, namespaces, extensions, error_log, enable_regexp,
build_smart_strings):
if extensions is not None and extensions:
for ns_name_tuple, extension in extensions.items():
if ns_name_tuple[0] is None:
raise XSLTExtensionError, \
u"extensions must not have empty namespaces"
if isinstance(extension, XSLTExtension):
if self._extension_elements is EMPTY_DICT:
self._extension_elements = {}
extensions = extensions.copy()
ns_utf = _utf8(ns_name_tuple[0])
name_utf = _utf8(ns_name_tuple[1])
self._extension_elements[(ns_utf, name_utf)] = extension
del extensions[ns_name_tuple]
_BaseContext.__init__(self, namespaces, extensions, error_log, enable_regexp,
build_smart_strings)
cdef _BaseContext _copy(self):
cdef _XSLTContext context
context = <_XSLTContext>_BaseContext._copy(self)
context._extension_elements = self._extension_elements
return context
cdef register_context(self, xslt.xsltTransformContext* xsltCtxt,
_Document doc):
self._xsltCtxt = xsltCtxt
self._set_xpath_context(xsltCtxt.xpathCtxt)
self._register_context(doc)
self.registerLocalFunctions(xsltCtxt, _register_xslt_function)
self.registerGlobalFunctions(xsltCtxt, _register_xslt_function)
_registerXSLTExtensions(xsltCtxt, self._extension_elements)
cdef free_context(self):
self._cleanup_context()
self._release_context()
if self._xsltCtxt is not NULL:
xslt.xsltFreeTransformContext(self._xsltCtxt)
self._xsltCtxt = NULL
self._release_temp_refs()
@cython.final
@cython.internal
@cython.freelist(8)
cdef class _XSLTQuotedStringParam:
u"""A wrapper class for literal XSLT string parameters that require
quote escaping.
"""
cdef bytes strval
def __cinit__(self, strval):
self.strval = _utf8(strval)
@cython.no_gc_clear
cdef class XSLT:
u"""XSLT(self, xslt_input, extensions=None, regexp=True, access_control=None)
Turn an XSL document into an XSLT object.
Calling this object on a tree or Element will execute the XSLT::
transform = etree.XSLT(xsl_tree)
result = transform(xml_tree)
Keyword arguments of the constructor:
- extensions: a dict mapping ``(namespace, name)`` pairs to
extension functions or extension elements
- regexp: enable exslt regular expression support in XPath
(default: True)
- access_control: access restrictions for network or file
system (see `XSLTAccessControl`)
Keyword arguments of the XSLT call:
- profile_run: enable XSLT profiling (default: False)
Other keyword arguments of the call are passed to the stylesheet
as parameters.
"""
cdef _XSLTContext _context
cdef xslt.xsltStylesheet* _c_style
cdef _XSLTResolverContext _xslt_resolver_context
cdef XSLTAccessControl _access_control
cdef _ErrorLog _error_log
def __cinit__(self):
self._c_style = NULL
def __init__(self, xslt_input, *, extensions=None, regexp=True,
access_control=None):
cdef xslt.xsltStylesheet* c_style = NULL
cdef xmlDoc* c_doc
cdef _Document doc
cdef _Element root_node
doc = _documentOrRaise(xslt_input)
root_node = _rootNodeOrRaise(xslt_input)
# set access control or raise TypeError
self._access_control = access_control
# make a copy of the document as stylesheet parsing modifies it
c_doc = _copyDocRoot(doc._c_doc, root_node._c_node)
# make sure we always have a stylesheet URL
if c_doc.URL is NULL:
doc_url_utf = python.PyUnicode_AsASCIIString(
f"string://__STRING__XSLT__/{id(self)}.xslt")
c_doc.URL = tree.xmlStrdup(_xcstr(doc_url_utf))
self._error_log = _ErrorLog()
self._xslt_resolver_context = _XSLTResolverContext()
_initXSLTResolverContext(self._xslt_resolver_context, doc._parser)
# keep a copy in case we need to access the stylesheet via 'document()'
self._xslt_resolver_context._c_style_doc = _copyDoc(c_doc, 1)
c_doc._private = <python.PyObject*>self._xslt_resolver_context
with self._error_log:
c_style = xslt.xsltParseStylesheetDoc(c_doc)
if c_style is NULL or c_style.errors:
tree.xmlFreeDoc(c_doc)
if c_style is not NULL:
xslt.xsltFreeStylesheet(c_style)
self._xslt_resolver_context._raise_if_stored()
# last error seems to be the most accurate here
if self._error_log.last_error is not None and \
self._error_log.last_error.message:
raise XSLTParseError(self._error_log.last_error.message,
self._error_log)
else:
raise XSLTParseError(
self._error_log._buildExceptionMessage(
u"Cannot parse stylesheet"),
self._error_log)
c_doc._private = NULL # no longer used!
self._c_style = c_style
self._context = _XSLTContext(None, extensions, self._error_log, regexp, True)
def __dealloc__(self):
if self._xslt_resolver_context is not None and \
self._xslt_resolver_context._c_style_doc is not NULL:
tree.xmlFreeDoc(self._xslt_resolver_context._c_style_doc)
# this cleans up the doc copy as well
if self._c_style is not NULL:
xslt.xsltFreeStylesheet(self._c_style)
property error_log:
u"The log of errors and warnings of an XSLT execution."
def __get__(self):
return self._error_log.copy()
@staticmethod
def strparam(strval):
u"""strparam(strval)
Mark an XSLT string parameter that requires quote escaping
before passing it into the transformation. Use it like this::
result = transform(doc, some_strval = XSLT.strparam(
'''it's \"Monty Python's\" ...'''))
Escaped string parameters can be reused without restriction.
"""
return _XSLTQuotedStringParam(strval)
@staticmethod
def set_global_max_depth(int max_depth):
u"""set_global_max_depth(max_depth)
The maximum traversal depth that the stylesheet engine will allow.
This does not only count the template recursion depth but also takes
the number of variables/parameters into account. The required setting
for a run depends on both the stylesheet and the input data.
Example::
XSLT.set_global_max_depth(5000)
Note that this is currently a global, module-wide setting because
libxslt does not support it at a per-stylesheet level.
"""
if max_depth < 0:
raise ValueError("cannot set a maximum stylesheet traversal depth < 0")
xslt.xsltMaxDepth = max_depth
def apply(self, _input, *, profile_run=False, **kw):
u"""apply(self, _input, profile_run=False, **kw)
:deprecated: call the object, not this method."""
return self(_input, profile_run=profile_run, **kw)
def tostring(self, _ElementTree result_tree):
u"""tostring(self, result_tree)
Save result doc to string based on stylesheet output method.
:deprecated: use str(result_tree) instead.
"""
return str(result_tree)
def __deepcopy__(self, memo):
return self.__copy__()
def __copy__(self):
return _copyXSLT(self)
def __call__(self, _input, *, profile_run=False, **kw):
u"""__call__(self, _input, profile_run=False, **kw)
Execute the XSL transformation on a tree or Element.
Pass the ``profile_run`` option to get profile information
about the XSLT. The result of the XSLT will have a property
xslt_profile that holds an XML tree with profiling data.
"""
cdef _XSLTContext context = None
cdef _XSLTResolverContext resolver_context
cdef _Document input_doc
cdef _Element root_node
cdef _Document result_doc
cdef _Document profile_doc = None
cdef xmlDoc* c_profile_doc
cdef xslt.xsltTransformContext* transform_ctxt
cdef xmlDoc* c_result = NULL
cdef xmlDoc* c_doc
cdef tree.xmlDict* c_dict
cdef const_char** params = NULL
assert self._c_style is not NULL, "XSLT stylesheet not initialised"
input_doc = _documentOrRaise(_input)
root_node = _rootNodeOrRaise(_input)
c_doc = _fakeRootDoc(input_doc._c_doc, root_node._c_node)
transform_ctxt = xslt.xsltNewTransformContext(self._c_style, c_doc)
if transform_ctxt is NULL:
_destroyFakeDoc(input_doc._c_doc, c_doc)
raise MemoryError()
# using the stylesheet dict is safer than using a possibly
# unrelated dict from the current thread. Almost all
# non-input tag/attr names will come from the stylesheet
# anyway.
if transform_ctxt.dict is not NULL:
xmlparser.xmlDictFree(transform_ctxt.dict)
if kw:
# parameter values are stored in the dict
# => avoid unnecessarily cluttering the global dict
transform_ctxt.dict = xmlparser.xmlDictCreateSub(self._c_style.doc.dict)
if transform_ctxt.dict is NULL:
xslt.xsltFreeTransformContext(transform_ctxt)
raise MemoryError()
else:
transform_ctxt.dict = self._c_style.doc.dict
xmlparser.xmlDictReference(transform_ctxt.dict)
xslt.xsltSetCtxtParseOptions(
transform_ctxt, input_doc._parser._parse_options)
if profile_run:
transform_ctxt.profile = 1
try:
context = self._context._copy()
context.register_context(transform_ctxt, input_doc)
resolver_context = self._xslt_resolver_context._copy()
transform_ctxt._private = <python.PyObject*>resolver_context
_convert_xslt_parameters(transform_ctxt, kw, ¶ms)
c_result = self._run_transform(
c_doc, params, context, transform_ctxt)
if params is not NULL:
# deallocate space for parameters
python.lxml_free(params)
if transform_ctxt.state != xslt.XSLT_STATE_OK:
if c_result is not NULL:
tree.xmlFreeDoc(c_result)
c_result = NULL
if transform_ctxt.profile:
c_profile_doc = xslt.xsltGetProfileInformation(transform_ctxt)
if c_profile_doc is not NULL:
profile_doc = _documentFactory(
c_profile_doc, input_doc._parser)
finally:
if context is not None:
context.free_context()
_destroyFakeDoc(input_doc._c_doc, c_doc)
try:
if resolver_context is not None and resolver_context._has_raised():
if c_result is not NULL:
tree.xmlFreeDoc(c_result)
c_result = NULL
resolver_context._raise_if_stored()
if context._exc._has_raised():
if c_result is not NULL:
tree.xmlFreeDoc(c_result)
c_result = NULL
context._exc._raise_if_stored()
if c_result is NULL:
# last error seems to be the most accurate here
error = self._error_log.last_error
if error is not None and error.message:
if error.line > 0:
message = f"{error.message}, line {error.line}"
else:
message = error.message
elif error is not None and error.line > 0:
message = f"Error applying stylesheet, line {error.line}"
else:
message = u"Error applying stylesheet"
raise XSLTApplyError(message, self._error_log)
finally:
if resolver_context is not None:
resolver_context.clear()
result_doc = _documentFactory(c_result, input_doc._parser)
c_dict = c_result.dict
xmlparser.xmlDictReference(c_dict)
__GLOBAL_PARSER_CONTEXT.initThreadDictRef(&c_result.dict)
if c_dict is not c_result.dict or \
self._c_style.doc.dict is not c_result.dict or \
input_doc._c_doc.dict is not c_result.dict:
with nogil:
if c_dict is not c_result.dict:
fixThreadDictNames(<xmlNode*>c_result,
c_dict, c_result.dict)
if self._c_style.doc.dict is not c_result.dict:
fixThreadDictNames(<xmlNode*>c_result,
self._c_style.doc.dict, c_result.dict)
if input_doc._c_doc.dict is not c_result.dict:
fixThreadDictNames(<xmlNode*>c_result,
input_doc._c_doc.dict, c_result.dict)
xmlparser.xmlDictFree(c_dict)
return _xsltResultTreeFactory(result_doc, self, profile_doc)
cdef xmlDoc* _run_transform(self, xmlDoc* c_input_doc,
const_char** params, _XSLTContext context,
xslt.xsltTransformContext* transform_ctxt):
cdef xmlDoc* c_result
xslt.xsltSetTransformErrorFunc(transform_ctxt, <void*>self._error_log,
<xmlerror.xmlGenericErrorFunc>_receiveXSLTError)
if self._access_control is not None:
self._access_control._register_in_context(transform_ctxt)
with self._error_log, nogil:
c_result = xslt.xsltApplyStylesheetUser(
self._c_style, c_input_doc, params, NULL, NULL, transform_ctxt)
return c_result
cdef _convert_xslt_parameters(xslt.xsltTransformContext* transform_ctxt,
dict parameters, const_char*** params_ptr):
cdef Py_ssize_t i, parameter_count
cdef const_char** params
cdef tree.xmlDict* c_dict = transform_ctxt.dict
params_ptr[0] = NULL
parameter_count = len(parameters)
if parameter_count == 0:
return
# allocate space for parameters
# * 2 as we want an entry for both key and value,
# and + 1 as array is NULL terminated
params = <const_char**>python.lxml_malloc(parameter_count * 2 + 1, sizeof(const_char*))
if not params:
raise MemoryError()
try:
i = 0
for key, value in parameters.iteritems():
k = _utf8(key)
if isinstance(value, _XSLTQuotedStringParam):
v = (<_XSLTQuotedStringParam>value).strval
xslt.xsltQuoteOneUserParam(
transform_ctxt, _xcstr(k), _xcstr(v))
else:
if isinstance(value, XPath):
v = (<XPath>value)._path
else:
v = _utf8(value)
params[i] = <const_char*>tree.xmlDictLookup(c_dict, _xcstr(k), len(k))
i += 1
params[i] = <const_char*>tree.xmlDictLookup(c_dict, _xcstr(v), len(v))
i += 1
except:
python.lxml_free(params)
raise
params[i] = NULL
params_ptr[0] = params
cdef XSLT _copyXSLT(XSLT stylesheet):
cdef XSLT new_xslt
cdef xmlDoc* c_doc
assert stylesheet._c_style is not NULL, "XSLT stylesheet not initialised"
new_xslt = XSLT.__new__(XSLT)
new_xslt._access_control = stylesheet._access_control
new_xslt._error_log = _ErrorLog()
new_xslt._context = stylesheet._context._copy()
new_xslt._xslt_resolver_context = stylesheet._xslt_resolver_context._copy()
new_xslt._xslt_resolver_context._c_style_doc = _copyDoc(
stylesheet._xslt_resolver_context._c_style_doc, 1)
c_doc = _copyDoc(stylesheet._c_style.doc, 1)
new_xslt._c_style = xslt.xsltParseStylesheetDoc(c_doc)
if new_xslt._c_style is NULL:
tree.xmlFreeDoc(c_doc)
raise MemoryError()
return new_xslt
@cython.final
cdef class _XSLTResultTree(_ElementTree):
"""The result of an XSLT evaluation.
Use ``str()`` or ``bytes()`` (or ``unicode()`` in Python 2.x) to serialise to a string,
and the ``.write_output()`` method to write serialise to a file.
"""
cdef XSLT _xslt
cdef _Document _profile
cdef xmlChar* _buffer
cdef Py_ssize_t _buffer_len
cdef Py_ssize_t _buffer_refcnt
def write_output(self, file, *, compression=0):
"""write_output(self, file, *, compression=0)
Serialise the XSLT output to a file or file-like object.
As opposed to the generic ``.write()`` method, ``.write_output()`` serialises
the result as defined by the ``<xsl:output>`` tag.
"""
cdef _FilelikeWriter writer = None
cdef _Document doc
cdef int r, c_compression
cdef const_xmlChar* c_encoding = NULL
cdef tree.xmlOutputBuffer* c_buffer
if self._context_node is not None:
doc = self._context_node._doc
else:
doc = None
if doc is None:
doc = self._doc
if doc is None:
raise XSLTSaveError("No document to serialise")
c_compression = compression or 0
if _isString(file):
file_path = _encodeFilename(file)
c_filename = _cstr(file_path)
with nogil:
r = xslt.xsltSaveResultToFilename(
c_filename, doc._c_doc, self._xslt._c_style, c_compression)
else:
xslt.LXML_GET_XSLT_ENCODING(c_encoding, self._xslt._c_style)
writer = _create_output_buffer(file, <const_char*>c_encoding, compression, &c_buffer, close=False)
if writer is None:
with nogil:
r = xslt.xsltSaveResultTo(c_buffer, doc._c_doc, self._xslt._c_style)
else:
r = xslt.xsltSaveResultTo(c_buffer, doc._c_doc, self._xslt._c_style)
if writer is not None:
writer._exc_context._raise_if_stored()
if r == -1:
python.PyErr_SetFromErrno(XSLTSaveError) # raises
cdef _saveToStringAndSize(self, xmlChar** s, int* l):
cdef _Document doc
cdef int r
if self._context_node is not None:
doc = self._context_node._doc
else:
doc = None
if doc is None:
doc = self._doc
if doc is None:
s[0] = NULL
return
with nogil:
r = xslt.xsltSaveResultToString(s, l, doc._c_doc,
self._xslt._c_style)
if r == -1:
raise MemoryError()
def __str__(self):
cdef xmlChar* s = NULL
cdef int l = 0
if not python.IS_PYTHON2:
return self.__unicode__()
self._saveToStringAndSize(&s, &l)
if s is NULL:
return ''
# we must not use 'funicode()' here as this is not always UTF-8
try:
result = <bytes>s[:l]
finally:
tree.xmlFree(s)
return result
def __unicode__(self):
cdef xmlChar* encoding
cdef xmlChar* s = NULL
cdef int l = 0
self._saveToStringAndSize(&s, &l)
if s is NULL:
return u''
encoding = self._xslt._c_style.encoding
try:
if encoding is NULL:
result = s[:l].decode('UTF-8')
else:
result = s[:l].decode(encoding)
finally:
tree.xmlFree(s)
return _stripEncodingDeclaration(result)
def __getbuffer__(self, Py_buffer* buffer, int flags):
cdef int l = 0
if buffer is NULL:
return
if self._buffer is NULL or flags & python.PyBUF_WRITABLE:
self._saveToStringAndSize(<xmlChar**>&buffer.buf, &l)
buffer.len = l
if self._buffer is NULL and not flags & python.PyBUF_WRITABLE:
self._buffer = <xmlChar*>buffer.buf
self._buffer_len = l
self._buffer_refcnt = 1
else:
buffer.buf = self._buffer
buffer.len = self._buffer_len
self._buffer_refcnt += 1
if flags & python.PyBUF_WRITABLE:
buffer.readonly = 0
else:
buffer.readonly = 1
if flags & python.PyBUF_FORMAT:
buffer.format = "B"
else:
buffer.format = NULL
buffer.ndim = 0
buffer.shape = NULL
buffer.strides = NULL
buffer.suboffsets = NULL
buffer.itemsize = 1
buffer.internal = NULL
if buffer.obj is not self: # set by Cython?
buffer.obj = self
def __releasebuffer__(self, Py_buffer* buffer):
if buffer is NULL:
return
if <xmlChar*>buffer.buf is self._buffer:
self._buffer_refcnt -= 1
if self._buffer_refcnt == 0:
tree.xmlFree(<char*>self._buffer)
self._buffer = NULL
else:
tree.xmlFree(<char*>buffer.buf)
buffer.buf = NULL
property xslt_profile:
u"""Return an ElementTree with profiling data for the stylesheet run.
"""
def __get__(self):
cdef object root
if self._profile is None:
return None
root = self._profile.getroot()
if root is None:
return None
return ElementTree(root)
def __del__(self):
self._profile = None
cdef _xsltResultTreeFactory(_Document doc, XSLT xslt, _Document profile):
cdef _XSLTResultTree result
result = <_XSLTResultTree>_newElementTree(doc, None, _XSLTResultTree)
result._xslt = xslt
result._profile = profile
return result
# functions like "output" and "write" are a potential security risk, but we
# rely on the user to configure XSLTAccessControl as needed
xslt.xsltRegisterAllExtras()
# enable EXSLT support for XSLT
xslt.exsltRegisterAll()
################################################################################
# XSLT PI support
cdef object _RE_PI_HREF = re.compile(ur'\s+href\s*=\s*(?:\'([^\']*)\'|"([^"]*)")')
cdef object _FIND_PI_HREF = _RE_PI_HREF.findall
cdef object _REPLACE_PI_HREF = _RE_PI_HREF.sub
cdef XPath __findStylesheetByID = None
cdef _findStylesheetByID(_Document doc, id):
global __findStylesheetByID
if __findStylesheetByID is None:
__findStylesheetByID = XPath(
u"//xsl:stylesheet[@xml:id = $id]",
namespaces={u"xsl" : u"http://www.w3.org/1999/XSL/Transform"})
return __findStylesheetByID(doc, id=id)
cdef class _XSLTProcessingInstruction(PIBase):
def parseXSL(self, parser=None):
u"""parseXSL(self, parser=None)
Try to parse the stylesheet referenced by this PI and return
an ElementTree for it. If the stylesheet is embedded in the
same document (referenced via xml:id), find and return an
ElementTree for the stylesheet Element.
The optional ``parser`` keyword argument can be passed to specify the
parser used to read from external stylesheet URLs.
"""
cdef _Document result_doc
cdef _Element result_node
cdef bytes href_utf
cdef const_xmlChar* c_href
cdef xmlAttr* c_attr
_assertValidNode(self)
if self._c_node.content is NULL:
raise ValueError, u"PI lacks content"
hrefs = _FIND_PI_HREF(u' ' + (<unsigned char*>self._c_node.content).decode('UTF-8'))
if len(hrefs) != 1:
raise ValueError, u"malformed PI attributes"
hrefs = hrefs[0]
href_utf = utf8(hrefs[0] or hrefs[1])
c_href = _xcstr(href_utf)
if c_href[0] != c'#':
# normal URL, try to parse from it
c_href = tree.xmlBuildURI(
c_href,
tree.xmlNodeGetBase(self._c_node.doc, self._c_node))
if c_href is not NULL:
try:
href_utf = <unsigned char*>c_href
finally:
tree.xmlFree(<char*>c_href)
result_doc = _parseDocumentFromURL(href_utf, parser)
return _elementTreeFactory(result_doc, None)
# ID reference to embedded stylesheet
# try XML:ID lookup
_assertValidDoc(self._doc)
c_href += 1 # skip leading '#'
c_attr = tree.xmlGetID(self._c_node.doc, c_href)
if c_attr is not NULL and c_attr.doc is self._c_node.doc:
result_node = _elementFactory(self._doc, c_attr.parent)
return _elementTreeFactory(result_node._doc, result_node)
# try XPath search
root = _findStylesheetByID(self._doc, funicode(c_href))
if not root:
raise ValueError, u"reference to non-existing embedded stylesheet"
elif len(root) > 1:
raise ValueError, u"ambiguous reference to embedded stylesheet"
result_node = root[0]
return _elementTreeFactory(result_node._doc, result_node)
def set(self, key, value):
u"""set(self, key, value)
Supports setting the 'href' pseudo-attribute in the text of
the processing instruction.
"""
if key != u"href":
raise AttributeError, \
u"only setting the 'href' attribute is supported on XSLT-PIs"
if value is None:
attrib = u""
elif u'"' in value or u'>' in value:
raise ValueError, u"Invalid URL, must not contain '\"' or '>'"
else:
attrib = f' href="{value}"'
text = u' ' + self.text
if _FIND_PI_HREF(text):
self.text = _REPLACE_PI_HREF(attrib, text)
else:
self.text = text + attrib