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serializer.pxi
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serializer.pxi
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# XML serialization and output functions
class SerialisationError(LxmlError):
u"""A libxml2 error that occurred during serialisation.
"""
cdef enum _OutputMethods:
OUTPUT_METHOD_XML
OUTPUT_METHOD_HTML
OUTPUT_METHOD_TEXT
cdef int _findOutputMethod(method) except -1:
if method is None:
return OUTPUT_METHOD_XML
method = method.lower()
if method == u"xml":
return OUTPUT_METHOD_XML
if method == u"html":
return OUTPUT_METHOD_HTML
if method == u"text":
return OUTPUT_METHOD_TEXT
raise ValueError, u"unknown output method %r" % method
cdef _textToString(xmlNode* c_node, encoding, bint with_tail):
cdef bint needs_conversion
cdef const_xmlChar* c_text
cdef xmlNode* c_text_node
cdef tree.xmlBuffer* c_buffer
cdef int error_result
c_buffer = tree.xmlBufferCreate()
if c_buffer is NULL:
raise MemoryError()
with nogil:
error_result = tree.xmlNodeBufGetContent(c_buffer, c_node)
if with_tail:
c_text_node = _textNodeOrSkip(c_node.next)
while c_text_node is not NULL:
tree.xmlBufferWriteChar(c_buffer, <const_char*>c_text_node.content)
c_text_node = _textNodeOrSkip(c_text_node.next)
c_text = tree.xmlBufferContent(c_buffer)
if error_result < 0 or c_text is NULL:
tree.xmlBufferFree(c_buffer)
raise SerialisationError, u"Error during serialisation (out of memory?)"
try:
needs_conversion = 0
if encoding is _unicode:
needs_conversion = 1
elif encoding is not None:
# Python prefers lower case encoding names
encoding = encoding.lower()
if encoding not in (u'utf8', u'utf-8'):
if encoding == u'ascii':
if isutf8(c_text):
# will raise a decode error below
needs_conversion = 1
else:
needs_conversion = 1
if needs_conversion:
text = python.PyUnicode_DecodeUTF8(
<const_char*>c_text, tree.xmlBufferLength(c_buffer), 'strict')
if encoding is not _unicode:
encoding = _utf8(encoding)
text = python.PyUnicode_AsEncodedString(
text, encoding, 'strict')
else:
text = (<unsigned char*>c_text)[:tree.xmlBufferLength(c_buffer)]
finally:
tree.xmlBufferFree(c_buffer)
return text
cdef _tostring(_Element element, encoding, doctype, method,
bint write_xml_declaration, bint write_complete_document,
bint pretty_print, bint with_tail, int standalone):
u"""Serialize an element to an encoded string representation of its XML
tree.
"""
cdef tree.xmlOutputBuffer* c_buffer
cdef tree.xmlBuf* c_result_buffer
cdef tree.xmlCharEncodingHandler* enchandler
cdef const_char* c_enc
cdef const_xmlChar* c_version
cdef const_xmlChar* c_doctype
cdef int c_method
cdef int error_result
if element is None:
return None
_assertValidNode(element)
c_method = _findOutputMethod(method)
if c_method == OUTPUT_METHOD_TEXT:
return _textToString(element._c_node, encoding, with_tail)
if encoding is None or encoding is _unicode:
c_enc = NULL
else:
encoding = _utf8(encoding)
c_enc = _cstr(encoding)
if doctype is None:
c_doctype = NULL
else:
doctype = _utf8(doctype)
c_doctype = _xcstr(doctype)
# it is necessary to *and* find the encoding handler *and* use
# encoding during output
enchandler = tree.xmlFindCharEncodingHandler(c_enc)
if enchandler is NULL and c_enc is not NULL:
if encoding is not None:
encoding = encoding.decode('UTF-8')
raise LookupError, u"unknown encoding: '%s'" % encoding
c_buffer = tree.xmlAllocOutputBuffer(enchandler)
if c_buffer is NULL:
tree.xmlCharEncCloseFunc(enchandler)
raise MemoryError()
with nogil:
_writeNodeToBuffer(c_buffer, element._c_node, c_enc, c_doctype, c_method,
write_xml_declaration, write_complete_document,
pretty_print, with_tail, standalone)
tree.xmlOutputBufferFlush(c_buffer)
if c_buffer.conv is not NULL:
c_result_buffer = c_buffer.conv
else:
c_result_buffer = c_buffer.buffer
error_result = c_buffer.error
if error_result != xmlerror.XML_ERR_OK:
tree.xmlOutputBufferClose(c_buffer)
_raiseSerialisationError(error_result)
try:
if encoding is _unicode:
result = (<unsigned char*>tree.xmlBufContent(
c_result_buffer))[:tree.xmlBufLength(c_result_buffer)].decode('UTF-8')
else:
result = <bytes>(<unsigned char*>tree.xmlBufContent(
c_result_buffer))[:tree.xmlBufLength(c_result_buffer)]
finally:
error_result = tree.xmlOutputBufferClose(c_buffer)
if error_result < 0:
_raiseSerialisationError(error_result)
return result
cdef bytes _tostringC14N(element_or_tree, bint exclusive, bint with_comments, inclusive_ns_prefixes):
cdef xmlDoc* c_doc
cdef xmlChar* c_buffer = NULL
cdef int byte_count = -1
cdef bytes result
cdef _Document doc
cdef _Element element
cdef xmlChar **c_inclusive_ns_prefixes
if isinstance(element_or_tree, _Element):
_assertValidNode(<_Element>element_or_tree)
doc = (<_Element>element_or_tree)._doc
c_doc = _plainFakeRootDoc(doc._c_doc, (<_Element>element_or_tree)._c_node, 0)
else:
doc = _documentOrRaise(element_or_tree)
_assertValidDoc(doc)
c_doc = doc._c_doc
c_inclusive_ns_prefixes = _convert_ns_prefixes(c_doc.dict, inclusive_ns_prefixes) if inclusive_ns_prefixes else NULL
try:
with nogil:
byte_count = c14n.xmlC14NDocDumpMemory(
c_doc, NULL, exclusive, c_inclusive_ns_prefixes, with_comments, &c_buffer)
finally:
_destroyFakeDoc(doc._c_doc, c_doc)
if c_inclusive_ns_prefixes is not NULL:
python.PyMem_Free(c_inclusive_ns_prefixes)
if byte_count < 0 or c_buffer is NULL:
if c_buffer is not NULL:
tree.xmlFree(c_buffer)
raise C14NError, u"C14N failed"
try:
result = c_buffer[:byte_count]
finally:
tree.xmlFree(c_buffer)
return result
cdef _raiseSerialisationError(int error_result):
if error_result == xmlerror.XML_ERR_NO_MEMORY:
raise MemoryError()
message = ErrorTypes._getName(error_result)
if message is None:
message = u"unknown error %d" % error_result
raise SerialisationError, message
############################################################
# low-level serialisation functions
cdef void _writeDoctype(tree.xmlOutputBuffer* c_buffer,
const_xmlChar* c_doctype) nogil:
tree.xmlOutputBufferWrite(c_buffer, tree.xmlStrlen(c_doctype),
<const_char*>c_doctype)
tree.xmlOutputBufferWriteString(c_buffer, "\n")
cdef void _writeNodeToBuffer(tree.xmlOutputBuffer* c_buffer,
xmlNode* c_node, const_char* encoding, const_xmlChar* c_doctype,
int c_method, bint write_xml_declaration,
bint write_complete_document,
bint pretty_print, bint with_tail,
int standalone) nogil:
cdef xmlNode* c_nsdecl_node
cdef xmlDoc* c_doc = c_node.doc
if write_xml_declaration and c_method == OUTPUT_METHOD_XML:
_writeDeclarationToBuffer(c_buffer, c_doc.version, encoding, standalone)
if c_doctype:
_writeDoctype(c_buffer, c_doctype)
# write internal DTD subset, preceding PIs/comments, etc.
if write_complete_document and not c_buffer.error:
if c_doctype is NULL:
_writeDtdToBuffer(c_buffer, c_doc, c_node.name, encoding)
_writePrevSiblings(c_buffer, c_node, encoding, pretty_print)
c_nsdecl_node = c_node
if not c_node.parent or c_node.parent.type != tree.XML_DOCUMENT_NODE:
# copy the node and add namespaces from parents
# this is required to make libxml write them
c_nsdecl_node = tree.xmlCopyNode(c_node, 2)
if not c_nsdecl_node:
c_buffer.error = xmlerror.XML_ERR_NO_MEMORY
return
_copyParentNamespaces(c_node, c_nsdecl_node)
c_nsdecl_node.parent = c_node.parent
c_nsdecl_node.children = c_node.children
c_nsdecl_node.last = c_node.last
# write node
if c_method == OUTPUT_METHOD_HTML:
tree.htmlNodeDumpFormatOutput(
c_buffer, c_doc, c_nsdecl_node, encoding, pretty_print)
else:
tree.xmlNodeDumpOutput(
c_buffer, c_doc, c_nsdecl_node, 0, pretty_print, encoding)
if c_nsdecl_node is not c_node:
# clean up
c_nsdecl_node.children = c_nsdecl_node.last = NULL
tree.xmlFreeNode(c_nsdecl_node)
if c_buffer.error:
return
# write tail, trailing comments, etc.
if with_tail:
_writeTail(c_buffer, c_node, encoding, pretty_print)
if write_complete_document:
_writeNextSiblings(c_buffer, c_node, encoding, pretty_print)
if pretty_print:
tree.xmlOutputBufferWrite(c_buffer, 1, "\n")
cdef void _writeDeclarationToBuffer(tree.xmlOutputBuffer* c_buffer,
const_xmlChar* version, const_char* encoding,
int standalone) nogil:
if version is NULL:
version = <unsigned char*>"1.0"
tree.xmlOutputBufferWrite(c_buffer, 15, "<?xml version='")
tree.xmlOutputBufferWriteString(c_buffer, <const_char*>version)
tree.xmlOutputBufferWrite(c_buffer, 12, "' encoding='")
tree.xmlOutputBufferWriteString(c_buffer, encoding)
if standalone == 0:
tree.xmlOutputBufferWrite(c_buffer, 20, "' standalone='no'?>\n")
elif standalone == 1:
tree.xmlOutputBufferWrite(c_buffer, 21, "' standalone='yes'?>\n")
else:
tree.xmlOutputBufferWrite(c_buffer, 4, "'?>\n")
cdef void _writeDtdToBuffer(tree.xmlOutputBuffer* c_buffer,
xmlDoc* c_doc, const_xmlChar* c_root_name,
const_char* encoding) nogil:
cdef tree.xmlDtd* c_dtd
cdef xmlNode* c_node
c_dtd = c_doc.intSubset
if not c_dtd or not c_dtd.name:
return
if tree.xmlStrcmp(c_root_name, c_dtd.name) != 0:
return
tree.xmlOutputBufferWrite(c_buffer, 10, "<!DOCTYPE ")
tree.xmlOutputBufferWriteString(c_buffer, <const_char*>c_dtd.name)
if c_dtd.SystemID and c_dtd.SystemID[0] != c'\0':
if c_dtd.ExternalID != NULL and c_dtd.ExternalID[0] != c'\0':
tree.xmlOutputBufferWrite(c_buffer, 9, ' PUBLIC "')
tree.xmlOutputBufferWriteString(c_buffer, <const_char*>c_dtd.ExternalID)
tree.xmlOutputBufferWrite(c_buffer, 3, '" "')
else:
tree.xmlOutputBufferWrite(c_buffer, 9, ' SYSTEM "')
tree.xmlOutputBufferWriteString(c_buffer, <const_char*>c_dtd.SystemID)
tree.xmlOutputBufferWrite(c_buffer, 1, '"')
if not c_dtd.entities and not c_dtd.elements and \
not c_dtd.attributes and not c_dtd.notations and \
not c_dtd.pentities:
tree.xmlOutputBufferWrite(c_buffer, 2, '>\n')
return
tree.xmlOutputBufferWrite(c_buffer, 3, ' [\n')
if c_dtd.notations and not c_buffer.error:
c_buf = tree.xmlBufferCreate()
if not c_buf:
c_buffer.error = xmlerror.XML_ERR_NO_MEMORY
return
tree.xmlDumpNotationTable(c_buf, <tree.xmlNotationTable*>c_dtd.notations)
tree.xmlOutputBufferWrite(
c_buffer, tree.xmlBufferLength(c_buf),
<const_char*>tree.xmlBufferContent(c_buf))
tree.xmlBufferFree(c_buf)
c_node = c_dtd.children
while c_node and not c_buffer.error:
tree.xmlNodeDumpOutput(c_buffer, c_node.doc, c_node, 0, 0, encoding)
c_node = c_node.next
tree.xmlOutputBufferWrite(c_buffer, 3, "]>\n")
cdef void _writeTail(tree.xmlOutputBuffer* c_buffer, xmlNode* c_node,
const_char* encoding, bint pretty_print) nogil:
u"Write the element tail."
c_node = c_node.next
while c_node and c_node.type == tree.XML_TEXT_NODE and not c_buffer.error:
tree.xmlNodeDumpOutput(c_buffer, c_node.doc, c_node, 0,
pretty_print, encoding)
c_node = c_node.next
cdef void _writePrevSiblings(tree.xmlOutputBuffer* c_buffer, xmlNode* c_node,
const_char* encoding, bint pretty_print) nogil:
cdef xmlNode* c_sibling
if c_node.parent and _isElement(c_node.parent):
return
# we are at a root node, so add PI and comment siblings
c_sibling = c_node
while c_sibling.prev and \
(c_sibling.prev.type == tree.XML_PI_NODE or \
c_sibling.prev.type == tree.XML_COMMENT_NODE):
c_sibling = c_sibling.prev
while c_sibling is not c_node and not c_buffer.error:
tree.xmlNodeDumpOutput(c_buffer, c_node.doc, c_sibling, 0,
pretty_print, encoding)
if pretty_print:
tree.xmlOutputBufferWriteString(c_buffer, "\n")
c_sibling = c_sibling.next
cdef void _writeNextSiblings(tree.xmlOutputBuffer* c_buffer, xmlNode* c_node,
const_char* encoding, bint pretty_print) nogil:
cdef xmlNode* c_sibling
if c_node.parent and _isElement(c_node.parent):
return
# we are at a root node, so add PI and comment siblings
c_sibling = c_node.next
while not c_buffer.error and c_sibling and \
(c_sibling.type == tree.XML_PI_NODE or \
c_sibling.type == tree.XML_COMMENT_NODE):
if pretty_print:
tree.xmlOutputBufferWriteString(c_buffer, "\n")
tree.xmlNodeDumpOutput(c_buffer, c_node.doc, c_sibling, 0,
pretty_print, encoding)
c_sibling = c_sibling.next
############################################################
# output to file-like objects
@cython.final
@cython.internal
cdef class _FilelikeWriter:
cdef object _filelike
cdef object _close_filelike
cdef _ExceptionContext _exc_context
cdef _ErrorLog error_log
def __cinit__(self, filelike, exc_context=None, compression=None):
if compression is not None and compression > 0:
filelike = gzip.GzipFile(
fileobj=filelike, mode=u'wb', compresslevel=compression)
self._close_filelike = filelike.close
self._filelike = filelike
if exc_context is None:
self._exc_context = _ExceptionContext()
else:
self._exc_context = exc_context
self.error_log = _ErrorLog()
cdef tree.xmlOutputBuffer* _createOutputBuffer(
self, tree.xmlCharEncodingHandler* enchandler) except NULL:
cdef tree.xmlOutputBuffer* c_buffer
c_buffer = tree.xmlOutputBufferCreateIO(
<tree.xmlOutputWriteCallback>_writeFilelikeWriter, _closeFilelikeWriter,
<python.PyObject*>self, enchandler)
if c_buffer is NULL:
raise IOError, u"Could not create I/O writer context."
return c_buffer
cdef int write(self, char* c_buffer, int size):
try:
if self._filelike is None:
raise IOError, u"File is already closed"
py_buffer = <bytes>c_buffer[:size]
self._filelike.write(py_buffer)
return size
except:
self._exc_context._store_raised()
return -1
cdef int close(self):
try:
if self._close_filelike is not None:
self._close_filelike()
# we should not close the file here as we didn't open it
self._filelike = None
return 0
except:
self._exc_context._store_raised()
return -1
cdef int _writeFilelikeWriter(void* ctxt, char* c_buffer, int len):
return (<_FilelikeWriter>ctxt).write(c_buffer, len)
cdef int _closeFilelikeWriter(void* ctxt):
return (<_FilelikeWriter>ctxt).close()
cdef _tofilelike(f, _Element element, encoding, doctype, method,
bint write_xml_declaration, bint write_doctype,
bint pretty_print, bint with_tail, int standalone,
int compression):
cdef python.PyThreadState* state = NULL
cdef _FilelikeWriter writer = None
cdef tree.xmlOutputBuffer* c_buffer
cdef tree.xmlCharEncodingHandler* enchandler
cdef const_char* c_enc
cdef const_xmlChar* c_doctype
cdef int error_result
if encoding is None:
c_enc = NULL
else:
encoding = _utf8(encoding)
c_enc = _cstr(encoding)
if doctype is None:
c_doctype = NULL
else:
doctype = _utf8(doctype)
c_doctype = _xcstr(doctype)
c_method = _findOutputMethod(method)
if c_method == OUTPUT_METHOD_TEXT:
data = _textToString(element._c_node, encoding, with_tail)
if compression:
bytes_out = BytesIO()
gzip_file = gzip.GzipFile(
fileobj=bytes_out, mode=u'wb', compresslevel=compression)
try:
gzip_file.write(data)
finally:
gzip_file.close()
data = bytes_out
if _isString(f):
filename8 = _encodeFilename(f)
f = open(filename8, u'wb')
try:
f.write(data)
finally:
f.close()
else:
f.write(data)
return
writer = _create_output_buffer(f, c_enc, compression, &c_buffer)
if writer is None:
state = python.PyEval_SaveThread()
_writeNodeToBuffer(c_buffer, element._c_node, c_enc, c_doctype, c_method,
write_xml_declaration, write_doctype,
pretty_print, with_tail, standalone)
error_result = c_buffer.error
if error_result == xmlerror.XML_ERR_OK:
error_result = tree.xmlOutputBufferClose(c_buffer)
if error_result > 0:
error_result = xmlerror.XML_ERR_OK
else:
tree.xmlOutputBufferClose(c_buffer)
if writer is None:
python.PyEval_RestoreThread(state)
else:
writer._exc_context._raise_if_stored()
if error_result != xmlerror.XML_ERR_OK:
_raiseSerialisationError(error_result)
cdef _create_output_buffer(f, const_char* c_enc, int compression,
tree.xmlOutputBuffer** c_buffer_ret):
cdef tree.xmlOutputBuffer* c_buffer
cdef _FilelikeWriter writer
enchandler = tree.xmlFindCharEncodingHandler(c_enc)
if enchandler is NULL:
raise LookupError(u"unknown encoding: '%s'" %
c_enc.decode(u'UTF-8') if c_enc is not NULL else u'')
try:
if _isString(f):
filename8 = _encodeFilename(f)
c_buffer = tree.xmlOutputBufferCreateFilename(
_cstr(filename8), enchandler, compression)
if c_buffer is NULL:
return python.PyErr_SetFromErrno(IOError) # raises IOError
writer = None
elif hasattr(f, u'write'):
writer = _FilelikeWriter(f, compression=compression)
c_buffer = writer._createOutputBuffer(enchandler)
else:
raise TypeError(
u"File or filename expected, got '%s'" %
python._fqtypename(f).decode('UTF-8'))
except:
tree.xmlCharEncCloseFunc(enchandler)
raise
c_buffer_ret[0] = c_buffer
return writer
cdef xmlChar **_convert_ns_prefixes(tree.xmlDict* c_dict, ns_prefixes) except NULL:
cdef size_t i, num_ns_prefixes = len(ns_prefixes)
# Need to allocate one extra memory block to handle last NULL entry
c_ns_prefixes = <xmlChar **>python.PyMem_Malloc(sizeof(xmlChar*) * (num_ns_prefixes + 1))
i = 0
try:
for prefix in ns_prefixes:
prefix_utf = _utf8(prefix)
c_prefix = tree.xmlDictExists(c_dict, _xcstr(prefix_utf), len(prefix_utf))
if c_prefix:
# unknown prefixes do not need to get serialised
c_ns_prefixes[i] = <xmlChar*>c_prefix
i += 1
except:
python.PyMem_Free(c_ns_prefixes)
raise
c_ns_prefixes[i] = NULL # append end marker
return c_ns_prefixes
cdef _tofilelikeC14N(f, _Element element, bint exclusive, bint with_comments,
int compression, inclusive_ns_prefixes):
cdef _FilelikeWriter writer = None
cdef tree.xmlOutputBuffer* c_buffer
cdef xmlChar **c_inclusive_ns_prefixes = NULL
cdef char* c_filename
cdef xmlDoc* c_base_doc
cdef xmlDoc* c_doc
cdef int bytes = -1
c_base_doc = element._c_node.doc
c_doc = _fakeRootDoc(c_base_doc, element._c_node)
try:
c_inclusive_ns_prefixes = _convert_ns_prefixes(c_doc.dict, inclusive_ns_prefixes) if inclusive_ns_prefixes else NULL
if _isString(f):
filename8 = _encodeFilename(f)
c_filename = _cstr(filename8)
with nogil:
bytes = c14n.xmlC14NDocSave(c_doc, NULL, exclusive, c_inclusive_ns_prefixes,
with_comments, c_filename, compression)
elif hasattr(f, u'write'):
writer = _FilelikeWriter(f, compression=compression)
c_buffer = writer._createOutputBuffer(NULL)
with writer.error_log:
bytes = c14n.xmlC14NDocSaveTo(c_doc, NULL, exclusive, c_inclusive_ns_prefixes,
with_comments, c_buffer)
if bytes >= 0:
bytes = tree.xmlOutputBufferClose(c_buffer)
else:
tree.xmlOutputBufferClose(c_buffer)
else:
raise TypeError, \
u"File or filename expected, got '%s'" % python._fqtypename(f).decode('UTF-8')
finally:
_destroyFakeDoc(c_base_doc, c_doc)
if c_inclusive_ns_prefixes is not NULL:
python.PyMem_Free(c_inclusive_ns_prefixes)
if writer is not None:
writer._exc_context._raise_if_stored()
if bytes < 0:
message = u"C14N failed"
if writer is not None:
errors = writer.error_log
if len(errors):
message = errors[0].message
raise C14NError, message
# incremental serialisation
cdef class xmlfile:
"""xmlfile(self, output_file, encoding=None, compression=None)
A simple mechanism for incremental XML serialisation.
Usage example:
with xmlfile("somefile.xml", encoding='utf-8') as xf:
xf.write_declaration(standalone=True)
xf.write_doctype('<!DOCTYPE root SYSTEM "some.dtd">')
# generate an element (the root element)
with xf.Element('root'):
# write a complete Element into the open root element
xf.write(etree.Element('test'))
# generate and write more Elements, e.g. through iterparse
for element in generate_some_elements():
# serialise generated elements into the XML file
xf.write(element)
"""
cdef object output_file
cdef object encoding
cdef int compresslevel
cdef _IncrementalFileWriter writer
def __init__(self, output_file not None, encoding=None, compression=None):
self.output_file = output_file
self.encoding = _utf8orNone(encoding)
self.compresslevel = compression or 0
def __enter__(self):
assert self.output_file is not None
cdef _IncrementalFileWriter writer = _IncrementalFileWriter(
self.output_file, self.encoding, self.compresslevel)
self.writer = writer
return writer
def __exit__(self, exc_type, exc_val, exc_tb):
if self.writer is not None:
raise_on_error = exc_type is None
self.writer._close(raise_on_error)
cdef enum _IncrementalFileWriterStatus:
WRITER_STARTING = 0
WRITER_DECL_WRITTEN = 1
WRITER_DTD_WRITTEN = 2
WRITER_IN_ELEMENT = 3
WRITER_FINISHED = 4
@cython.final
@cython.internal
cdef class _IncrementalFileWriter:
cdef tree.xmlOutputBuffer* _c_out
cdef object _encoding
cdef const_char* _c_encoding
cdef object _target
cdef list _element_stack
cdef int _status
def __cinit__(self, outfile, bytes encoding, int compresslevel):
self._status = WRITER_STARTING
self._element_stack = []
if encoding is None:
encoding = b'ASCII'
self._encoding = encoding
self._c_encoding = _cstr(encoding) if encoding is not None else NULL
self._target = _create_output_buffer(outfile, self._c_encoding, compresslevel, &self._c_out)
def write_declaration(self, version=None, standalone=None, doctype=None):
"""write_declaration(self, version=None, standalone=None, doctype=None)
Write an XML declaration and (optionally) a doctype into the file.
"""
assert self._c_out is not NULL
cdef const_xmlChar* c_version
cdef int c_standalone
if self._status >= WRITER_DECL_WRITTEN:
raise LxmlSyntaxError("XML declaration already written")
version = _utf8orNone(version)
c_version = _xcstr(version) if version is not None else NULL
doctype = _utf8orNone(doctype)
if standalone is None:
c_standalone = -1
else:
c_standalone = 1 if standalone else 0
_writeDeclarationToBuffer(self._c_out, c_version, self._c_encoding, c_standalone)
if doctype is not None:
_writeDoctype(self._c_out, _xcstr(doctype))
self._status = WRITER_DTD_WRITTEN
else:
self._status = WRITER_DECL_WRITTEN
self._handle_error(xmlerror.XML_ERR_OK)
def write_doctype(self, doctype):
"""write_doctype(self, doctype)
Writes the given doctype declaration verbatimly into the file.
"""
assert self._c_out is not NULL
if doctype is None:
return
if self._status >= WRITER_DTD_WRITTEN:
raise LxmlSyntaxError("DOCTYPE already written or cannot write it here")
doctype = _utf8(doctype)
_writeDoctype(self._c_out, _xcstr(doctype))
self._status = WRITER_DTD_WRITTEN
self._handle_error(xmlerror.XML_ERR_OK)
def element(self, tag, attrib=None, nsmap=None, **_extra):
"""element(self, tag, attrib=None, nsmap=None, **_extra)
Returns a context manager that writes an opening and closing tag.
"""
assert self._c_out is not NULL
attributes = []
if attrib is not None:
if isinstance(attrib, (dict, _Attrib)):
attrib = attrib.items()
for name, value in attrib:
if name not in _extra:
ns, name = _getNsTag(name)
attributes.append((ns, name, _utf8(value)))
if _extra:
for name, value in _extra.iteritems():
ns, name = _getNsTag(name)
attributes.append((ns, name, _utf8(value)))
reversed_nsmap = {}
if nsmap:
for prefix, ns in nsmap.items():
if prefix is not None:
prefix = _utf8(prefix)
_prefixValidOrRaise(prefix)
reversed_nsmap[_utf8(ns)] = prefix
ns, name = _getNsTag(tag)
return _FileWriterElement(self, (ns, name, attributes, reversed_nsmap))
cdef _write_qname(self, bytes name, bytes prefix):
if prefix is not None:
tree.xmlOutputBufferWrite(self._c_out, len(prefix), _cstr(prefix))
tree.xmlOutputBufferWrite(self._c_out, 1, ':')
tree.xmlOutputBufferWrite(self._c_out, len(name), _cstr(name))
cdef _write_start_element(self, element_config):
if self._status > WRITER_IN_ELEMENT:
raise LxmlSyntaxError("cannot append trailing element to complete XML document")
ns, name, attributes, nsmap = element_config
flat_namespace_map, new_namespaces = self._collect_namespaces(nsmap)
prefix = self._find_prefix(ns, flat_namespace_map, new_namespaces)
tree.xmlOutputBufferWrite(self._c_out, 1, '<')
self._write_qname(name, prefix)
self._write_attributes_and_namespaces(
attributes, flat_namespace_map, new_namespaces)
tree.xmlOutputBufferWrite(self._c_out, 1, '>')
self._handle_error(xmlerror.XML_ERR_OK)
self._element_stack.append((ns, name, prefix, flat_namespace_map))
self._status = WRITER_IN_ELEMENT
cdef _write_attributes_and_namespaces(self, list attributes,
dict flat_namespace_map,
list new_namespaces):
if attributes:
# _find_prefix() may append to new_namespaces => build them first
attributes = [
(self._find_prefix(ns, flat_namespace_map, new_namespaces), name, value)
for ns, name, value in attributes ]
if new_namespaces:
new_namespaces.sort()
self._write_attributes_list(new_namespaces)
if attributes:
self._write_attributes_list(attributes)
cdef _write_attributes_list(self, list attributes):
for prefix, name, value in attributes:
tree.xmlOutputBufferWrite(self._c_out, 1, ' ')
self._write_qname(name, prefix)
tree.xmlOutputBufferWrite(self._c_out, 2, '="')
tree.xmlOutputBufferWriteEscape(self._c_out, _xcstr(value), NULL)
tree.xmlOutputBufferWrite(self._c_out, 1, '"')
cdef _write_end_element(self, element_config):
if self._status != WRITER_IN_ELEMENT:
raise LxmlSyntaxError("not in an element")
if not self._element_stack or self._element_stack[-1][:2] != element_config[:2]:
raise LxmlSyntaxError("inconsistent exit action in context manager")
name, prefix = self._element_stack.pop()[1:3]
tree.xmlOutputBufferWrite(self._c_out, 2, '</')
self._write_qname(name, prefix)
tree.xmlOutputBufferWrite(self._c_out, 1, '>')
if not self._element_stack:
self._status = WRITER_FINISHED
self._handle_error(xmlerror.XML_ERR_OK)
cdef _find_prefix(self, bytes href, dict flat_namespaces_map, list new_namespaces):
if href is None:
return None
if href in flat_namespaces_map:
return flat_namespaces_map[href]
# need to create a new prefix
prefixes = flat_namespaces_map.values()
i = 0
while True:
prefix = _utf8('ns%d' % i)
if prefix not in prefixes:
new_namespaces.append((b'xmlns', prefix, href))
flat_namespaces_map[href] = prefix
return prefix
i += 1
def _collect_namespaces(self, dict nsmap):
new_namespaces = []
flat_namespaces_map = {}
for ns, prefix in nsmap.iteritems():
flat_namespaces_map[ns] = prefix
if prefix is None:
new_namespaces.append((None, b'xmlns', ns))
else:
new_namespaces.append((b'xmlns', prefix, ns))
# merge in flat namespace map of parent
if self._element_stack:
for ns, prefix in (<dict>self._element_stack[-1][-1]).iteritems():
if flat_namespaces_map.get(ns) is None:
# unknown or empty prefix => prefer a 'real' prefix
flat_namespaces_map[ns] = prefix
return flat_namespaces_map, new_namespaces
def write(self, *args, bint with_tail=True, bint pretty_print=False):
"""write(self, *args, with_tail=True, pretty_print=False)
Write subtrees or strings into the file.
"""
assert self._c_out is not NULL
for content in args:
if _isString(content):
if self._status != WRITER_IN_ELEMENT:
if self._status > WRITER_IN_ELEMENT or content.strip():
raise LxmlSyntaxError("not in an element")
content = _utf8(content)
tree.xmlOutputBufferWriteEscape(self._c_out, _xcstr(content), NULL)
elif iselement(content):
if self._status > WRITER_IN_ELEMENT:
raise LxmlSyntaxError("cannot append trailing element to complete XML document")
_writeNodeToBuffer(self._c_out, (<_Element>content)._c_node,
self._c_encoding, NULL, OUTPUT_METHOD_XML,
False, False, pretty_print, with_tail, False)
if (<_Element>content)._c_node.type == tree.XML_ELEMENT_NODE:
if not self._element_stack:
self._status = WRITER_FINISHED
else:
raise TypeError("got invalid input value of type %s, expected string or Element" % type(content))
self._handle_error(xmlerror.XML_ERR_OK)
cdef _close(self, bint raise_on_error):
if raise_on_error:
if self._status < WRITER_IN_ELEMENT:
raise LxmlSyntaxError("no content written")
if self._element_stack:
raise LxmlSyntaxError("pending open tags on close")
error_result = self._c_out.error
if error_result == xmlerror.XML_ERR_OK:
error_result = tree.xmlOutputBufferClose(self._c_out)
if error_result > 0:
error_result = xmlerror.XML_ERR_OK
else:
tree.xmlOutputBufferClose(self._c_out)
if raise_on_error:
self._handle_error(error_result)
cdef _handle_error(self, int error_result):
if error_result == xmlerror.XML_ERR_OK:
error_result = self._c_out.error
if error_result != xmlerror.XML_ERR_OK:
if self._writer is not None:
self._writer._exc_context._raise_if_stored()
_raiseSerialisationError(error_result)
@cython.final
@cython.internal
cdef class _FileWriterElement:
cdef object _element
cdef _IncrementalFileWriter _writer
def __cinit__(self, _IncrementalFileWriter writer not None, element_config):
self._writer = writer
self._element = element_config
def __enter__(self):
self._writer._write_start_element(self._element)
def __exit__(self, exc_type, exc_val, exc_tb):
self._writer._write_end_element(self._element)
# dump node to file (mainly for debug)
cdef _dumpToFile(f, xmlNode* c_node, bint pretty_print, bint with_tail):
cdef tree.xmlOutputBuffer* c_buffer
cdef stdio.FILE* c_file
c_file = python.PyFile_AsFile(f)
if c_file is NULL:
raise ValueError, u"not a file"
c_buffer = tree.xmlOutputBufferCreateFile(c_file, NULL)
tree.xmlNodeDumpOutput(c_buffer, c_node.doc, c_node, 0, pretty_print, NULL)
if with_tail:
_writeTail(c_buffer, c_node, NULL, 0)
if not pretty_print:
# not written yet
tree.xmlOutputBufferWriteString(c_buffer, '\n')
tree.xmlOutputBufferFlush(c_buffer)