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lxml
apihelpers.pxi
# Private/public helper functions for API functions from lxml.includes cimport uri cdef void displayNode(xmlNode* c_node, indent): # to help with debugging cdef xmlNode* c_child try: print indent * u' ', <long>c_node c_child = c_node.children while c_child is not NULL: displayNode(c_child, indent + 1) c_child = c_child.next finally: return # swallow any exceptions cdef inline int _assertValidNode(_Element element) except -1: assert element._c_node is not NULL, u"invalid Element proxy at %s" % id(element) cdef inline int _assertValidDoc(_Document doc) except -1: assert doc._c_doc is not NULL, u"invalid Document proxy at %s" % id(doc) cdef _Document _documentOrRaise(object input): u"""Call this to get the document of a _Document, _ElementTree or _Element object, or to raise an exception if it can't be determined. Should be used in all API functions for consistency. """ cdef _Document doc if isinstance(input, _ElementTree): if (<_ElementTree>input)._context_node is not None: doc = (<_ElementTree>input)._context_node._doc else: doc = None elif isinstance(input, _Element): doc = (<_Element>input)._doc elif isinstance(input, _Document): doc = <_Document>input else: raise TypeError, f"Invalid input object: {python._fqtypename(input).decode('utf8')}" if doc is None: raise ValueError, f"Input object has no document: {python._fqtypename(input).decode('utf8')}" _assertValidDoc(doc) return doc cdef _Element _rootNodeOrRaise(object input): u"""Call this to get the root node of a _Document, _ElementTree or _Element object, or to raise an exception if it can't be determined. Should be used in all API functions for consistency. """ cdef _Element node if isinstance(input, _ElementTree): node = (<_ElementTree>input)._context_node elif isinstance(input, _Element): node = <_Element>input elif isinstance(input, _Document): node = (<_Document>input).getroot() else: raise TypeError, f"Invalid input object: {python._fqtypename(input).decode('utf8')}" if (node is None or not node._c_node or node._c_node.type != tree.XML_ELEMENT_NODE): raise ValueError, f"Input object is not an XML element: {python._fqtypename(input).decode('utf8')}" _assertValidNode(node) return node cdef bint _isAncestorOrSame(xmlNode* c_ancestor, xmlNode* c_node): while c_node: if c_node is c_ancestor: return True c_node = c_node.parent return False cdef _Element _makeElement(tag, xmlDoc* c_doc, _Document doc, _BaseParser parser, text, tail, attrib, nsmap, dict extra_attrs): u"""Create a new element and initialize text content, namespaces and attributes. This helper function will reuse as much of the existing document as possible: If 'parser' is None, the parser will be inherited from 'doc' or the default parser will be used. If 'doc' is None, 'c_doc' is used to create a new _Document and the new element is made its root node. If 'c_doc' is also NULL, a new xmlDoc will be created. """ cdef xmlNode* c_node if doc is not None: c_doc = doc._c_doc ns_utf, name_utf = _getNsTag(tag) if parser is not None and parser._for_html: _htmlTagValidOrRaise(name_utf) if c_doc is NULL: c_doc = _newHTMLDoc() else: _tagValidOrRaise(name_utf) if c_doc is NULL: c_doc = _newXMLDoc() c_node = _createElement(c_doc, name_utf) if c_node is NULL: if doc is None and c_doc is not NULL: tree.xmlFreeDoc(c_doc) raise MemoryError() try: if doc is None: tree.xmlDocSetRootElement(c_doc, c_node) doc = _documentFactory(c_doc, parser) if text is not None: _setNodeText(c_node, text) if tail is not None: _setTailText(c_node, tail) # add namespaces to node if necessary _setNodeNamespaces(c_node, doc, ns_utf, nsmap) _initNodeAttributes(c_node, doc, attrib, extra_attrs) return _elementFactory(doc, c_node) except: # free allocated c_node/c_doc unless Python does it for us if c_node.doc is not c_doc: # node not yet in document => will not be freed by document if tail is not None: _removeText(c_node.next) # tail tree.xmlFreeNode(c_node) if doc is None: # c_doc will not be freed by doc tree.xmlFreeDoc(c_doc) raise cdef int _initNewElement(_Element element, bint is_html, name_utf, ns_utf, _BaseParser parser, attrib, nsmap, dict extra_attrs) except -1: u"""Initialise a new Element object. This is used when users instantiate a Python Element subclass directly, without it being mapped to an existing XML node. """ cdef xmlDoc* c_doc cdef xmlNode* c_node cdef _Document doc if is_html: _htmlTagValidOrRaise(name_utf) c_doc = _newHTMLDoc() else: _tagValidOrRaise(name_utf) c_doc = _newXMLDoc() c_node = _createElement(c_doc, name_utf) if c_node is NULL: if c_doc is not NULL: tree.xmlFreeDoc(c_doc) raise MemoryError() tree.xmlDocSetRootElement(c_doc, c_node) doc = _documentFactory(c_doc, parser) # add namespaces to node if necessary _setNodeNamespaces(c_node, doc, ns_utf, nsmap) _initNodeAttributes(c_node, doc, attrib, extra_attrs) _registerProxy(element, doc, c_node) element._init() return 0 cdef _Element _makeSubElement(_Element parent, tag, text, tail, attrib, nsmap, dict extra_attrs): u"""Create a new child element and initialize text content, namespaces and attributes. """ cdef xmlNode* c_node cdef xmlDoc* c_doc if parent is None or parent._doc is None: return None _assertValidNode(parent) ns_utf, name_utf = _getNsTag(tag) c_doc = parent._doc._c_doc if parent._doc._parser is not None and parent._doc._parser._for_html: _htmlTagValidOrRaise(name_utf) else: _tagValidOrRaise(name_utf) c_node = _createElement(c_doc, name_utf) if c_node is NULL: raise MemoryError() tree.xmlAddChild(parent._c_node, c_node) try: if text is not None: _setNodeText(c_node, text) if tail is not None: _setTailText(c_node, tail) # add namespaces to node if necessary _setNodeNamespaces(c_node, parent._doc, ns_utf, nsmap) _initNodeAttributes(c_node, parent._doc, attrib, extra_attrs) return _elementFactory(parent._doc, c_node) except: # make sure we clean up in case of an error _removeNode(parent._doc, c_node) raise cdef int _setNodeNamespaces(xmlNode* c_node, _Document doc, object node_ns_utf, object nsmap) except -1: u"""Lookup current namespace prefixes, then set namespace structure for node (if 'node_ns_utf' was provided) and register new ns-prefix mappings. 'node_ns_utf' should only be passed for a newly created node. """ cdef xmlNs* c_ns cdef list nsdefs if nsmap: for prefix, href in _iter_nsmap(nsmap): href_utf = _utf8(href) _uriValidOrRaise(href_utf) c_href = _xcstr(href_utf) if prefix is not None: prefix_utf = _utf8(prefix) _prefixValidOrRaise(prefix_utf) c_prefix = _xcstr(prefix_utf) else: c_prefix = <const_xmlChar*>NULL # add namespace with prefix if it is not already known c_ns = tree.xmlSearchNs(doc._c_doc, c_node, c_prefix) if c_ns is NULL or \ c_ns.href is NULL or \ tree.xmlStrcmp(c_ns.href, c_href) != 0: c_ns = tree.xmlNewNs(c_node, c_href, c_prefix) if href_utf == node_ns_utf: tree.xmlSetNs(c_node, c_ns) node_ns_utf = None if node_ns_utf is not None: _uriValidOrRaise(node_ns_utf) doc._setNodeNs(c_node, _xcstr(node_ns_utf)) return 0 cdef dict _build_nsmap(xmlNode* c_node): """ Namespace prefix->URI mapping known in the context of this Element. This includes all namespace declarations of the parents. """ cdef xmlNs* c_ns nsmap = {} while c_node is not NULL and c_node.type == tree.XML_ELEMENT_NODE: c_ns = c_node.nsDef while c_ns is not NULL: if c_ns.prefix or c_ns.href: prefix = funicodeOrNone(c_ns.prefix) if prefix not in nsmap: nsmap[prefix] = funicodeOrNone(c_ns.href) c_ns = c_ns.next c_node = c_node.parent return nsmap cdef _iter_nsmap(nsmap): """ Create a reproducibly ordered iterable from an nsmap mapping. Tries to preserve an existing order and sorts if it assumes no order. The difference to _iter_attrib() is that None doesn't sort with strings in Py3.x. """ if python.PY_VERSION_HEX >= 0x03060000: # dicts are insertion-ordered in Py3.6+ => keep the user provided order. if isinstance(nsmap, dict): return nsmap.items() if len(nsmap) <= 1: return nsmap.items() # nsmap will usually be a plain unordered dict => avoid type checking overhead if type(nsmap) is not dict and isinstance(nsmap, OrderedDict): return nsmap.items() # keep existing order if None not in nsmap: return sorted(nsmap.items()) # Move the default namespace to the end. This makes sure libxml2 # prefers a prefix if the ns is defined redundantly on the same # element. That way, users can work around a problem themselves # where default namespace attributes on non-default namespaced # elements serialise without prefix (i.e. into the non-default # namespace). default_ns = nsmap[None] nsdefs = [(k, v) for k, v in nsmap.items() if k is not None] nsdefs.sort() nsdefs.append((None, default_ns)) return nsdefs cdef _iter_attrib(attrib): """ Create a reproducibly ordered iterable from an attrib mapping. Tries to preserve an existing order and sorts if it assumes no order. """ # dicts are insertion-ordered in Py3.6+ => keep the user provided order. if python.PY_VERSION_HEX >= 0x03060000 and isinstance(attrib, dict) or ( isinstance(attrib, (_Attrib, OrderedDict))): return attrib.items() # assume it's an unordered mapping of some kind return sorted(attrib.items()) cdef _initNodeAttributes(xmlNode* c_node, _Document doc, attrib, dict extra): u"""Initialise the attributes of an element node. """ cdef bint is_html cdef xmlNs* c_ns if attrib is not None and not hasattr(attrib, u'items'): raise TypeError, f"Invalid attribute dictionary: {python._fqtypename(attrib).decode('utf8')}" if not attrib and not extra: return # nothing to do is_html = doc._parser._for_html seen = set() if extra: if python.PY_VERSION_HEX >= 0x03060000: for name, value in extra.items(): _addAttributeToNode(c_node, doc, is_html, name, value, seen) else: for name, value in sorted(extra.items()): _addAttributeToNode(c_node, doc, is_html, name, value, seen) if attrib: for name, value in _iter_attrib(attrib): _addAttributeToNode(c_node, doc, is_html, name, value, seen) cdef int _addAttributeToNode(xmlNode* c_node, _Document doc, bint is_html, name, value, set seen_tags) except -1: ns_utf, name_utf = tag = _getNsTag(name) if tag in seen_tags: return 0 seen_tags.add(tag) if not is_html: _attributeValidOrRaise(name_utf) value_utf = _utf8(value) if ns_utf is None: tree.xmlNewProp(c_node, _xcstr(name_utf), _xcstr(value_utf)) else: _uriValidOrRaise(ns_utf) c_ns = doc._findOrBuildNodeNs(c_node, _xcstr(ns_utf), NULL, 1) tree.xmlNewNsProp(c_node, c_ns, _xcstr(name_utf), _xcstr(value_utf)) return 0 ctypedef struct _ns_node_ref: xmlNs* ns xmlNode* node cdef int _collectNsDefs(xmlNode* c_element, _ns_node_ref **_c_ns_list, size_t *_c_ns_list_len, size_t *_c_ns_list_size) except -1: c_ns_list = _c_ns_list[0] cdef size_t c_ns_list_len = _c_ns_list_len[0] cdef size_t c_ns_list_size = _c_ns_list_size[0] c_nsdef = c_element.nsDef while c_nsdef is not NULL: if c_ns_list_len >= c_ns_list_size: if c_ns_list is NULL: c_ns_list_size = 20 else: c_ns_list_size *= 2 c_nsref_ptr = <_ns_node_ref*> python.lxml_realloc( c_ns_list, c_ns_list_size, sizeof(_ns_node_ref)) if c_nsref_ptr is NULL: if c_ns_list is not NULL: python.lxml_free(c_ns_list) _c_ns_list[0] = NULL raise MemoryError() c_ns_list = c_nsref_ptr c_ns_list[c_ns_list_len] = _ns_node_ref(c_nsdef, c_element) c_ns_list_len += 1 c_nsdef = c_nsdef.next _c_ns_list_size[0] = c_ns_list_size _c_ns_list_len[0] = c_ns_list_len _c_ns_list[0] = c_ns_list cdef int _removeUnusedNamespaceDeclarations(xmlNode* c_element, set prefixes_to_keep) except -1: u"""Remove any namespace declarations from a subtree that are not used by any of its elements (or attributes). If a 'prefixes_to_keep' is provided, it must be a set of prefixes. Any corresponding namespace mappings will not be removed as part of the cleanup. """ cdef xmlNode* c_node cdef _ns_node_ref* c_ns_list = NULL cdef size_t c_ns_list_size = 0 cdef size_t c_ns_list_len = 0 cdef size_t i if c_element.parent and c_element.parent.type == tree.XML_DOCUMENT_NODE: # include declarations on the document node _collectNsDefs(c_element.parent, &c_ns_list, &c_ns_list_len, &c_ns_list_size) tree.BEGIN_FOR_EACH_ELEMENT_FROM(c_element, c_element, 1) # collect all new namespace declarations into the ns list if c_element.nsDef: _collectNsDefs(c_element, &c_ns_list, &c_ns_list_len, &c_ns_list_size) # remove all namespace declarations from the list that are referenced if c_ns_list_len and c_element.type == tree.XML_ELEMENT_NODE: c_node = c_element while c_node and c_ns_list_len: if c_node.ns: for i in range(c_ns_list_len): if c_node.ns is c_ns_list[i].ns: c_ns_list_len -= 1 c_ns_list[i] = c_ns_list[c_ns_list_len] #c_ns_list[c_ns_list_len] = _ns_node_ref(NULL, NULL) break if c_node is c_element: # continue with attributes c_node = <xmlNode*>c_element.properties else: c_node = c_node.next tree.END_FOR_EACH_ELEMENT_FROM(c_element) if c_ns_list is NULL: return 0 # free all namespace declarations that remained in the list, # except for those we should keep explicitly cdef xmlNs* c_nsdef for i in range(c_ns_list_len): if prefixes_to_keep is not None: if c_ns_list[i].ns.prefix and c_ns_list[i].ns.prefix in prefixes_to_keep: continue c_node = c_ns_list[i].node c_nsdef = c_node.nsDef if c_nsdef is c_ns_list[i].ns: c_node.nsDef = c_node.nsDef.next else: while c_nsdef.next is not c_ns_list[i].ns: c_nsdef = c_nsdef.next c_nsdef.next = c_nsdef.next.next tree.xmlFreeNs(c_ns_list[i].ns) if c_ns_list is not NULL: python.lxml_free(c_ns_list) return 0 cdef xmlNs* _searchNsByHref(xmlNode* c_node, const_xmlChar* c_href, bint is_attribute): u"""Search a namespace declaration that covers a node (element or attribute). For attributes, try to find a prefixed namespace declaration instead of the default namespaces. This helps in supporting round-trips for attributes on elements with a different namespace. """ cdef xmlNs* c_ns cdef xmlNs* c_default_ns = NULL cdef xmlNode* c_element if c_href is NULL or c_node is NULL or c_node.type == tree.XML_ENTITY_REF_NODE: return NULL if tree.xmlStrcmp(c_href, tree.XML_XML_NAMESPACE) == 0: # no special cases here, let libxml2 handle this return tree.xmlSearchNsByHref(c_node.doc, c_node, c_href) if c_node.type == tree.XML_ATTRIBUTE_NODE: is_attribute = 1 while c_node is not NULL and c_node.type != tree.XML_ELEMENT_NODE: c_node = c_node.parent c_element = c_node while c_node is not NULL: if c_node.type == tree.XML_ELEMENT_NODE: c_ns = c_node.nsDef while c_ns is not NULL: if c_ns.href is not NULL and tree.xmlStrcmp(c_href, c_ns.href) == 0: if c_ns.prefix is NULL and is_attribute: # for attributes, continue searching a named # prefix, but keep the first default namespace # declaration that we found if c_default_ns is NULL: c_default_ns = c_ns elif tree.xmlSearchNs( c_element.doc, c_element, c_ns.prefix) is c_ns: # start node is in namespace scope => found! return c_ns c_ns = c_ns.next if c_node is not c_element and c_node.ns is not NULL: # optimise: the node may have the namespace itself c_ns = c_node.ns if c_ns.href is not NULL and tree.xmlStrcmp(c_href, c_ns.href) == 0: if c_ns.prefix is NULL and is_attribute: # for attributes, continue searching a named # prefix, but keep the first default namespace # declaration that we found if c_default_ns is NULL: c_default_ns = c_ns elif tree.xmlSearchNs( c_element.doc, c_element, c_ns.prefix) is c_ns: # start node is in namespace scope => found! return c_ns c_node = c_node.parent # nothing found => use a matching default namespace or fail if c_default_ns is not NULL: if tree.xmlSearchNs(c_element.doc, c_element, NULL) is c_default_ns: return c_default_ns return NULL cdef int _replaceNodeByChildren(_Document doc, xmlNode* c_node) except -1: # NOTE: this does not deallocate the node, just unlink it! cdef xmlNode* c_parent cdef xmlNode* c_child if c_node.children is NULL: tree.xmlUnlinkNode(c_node) return 0 c_parent = c_node.parent # fix parent links of children c_child = c_node.children while c_child is not NULL: c_child.parent = c_parent c_child = c_child.next # fix namespace references of children if their parent's namespace # declarations get lost if c_node.nsDef is not NULL: c_child = c_node.children while c_child is not NULL: moveNodeToDocument(doc, doc._c_doc, c_child) c_child = c_child.next # fix sibling links to/from child slice if c_node.prev is NULL: c_parent.children = c_node.children else: c_node.prev.next = c_node.children c_node.children.prev = c_node.prev if c_node.next is NULL: c_parent.last = c_node.last else: c_node.next.prev = c_node.last c_node.last.next = c_node.next # unlink c_node c_node.children = c_node.last = NULL c_node.parent = c_node.next = c_node.prev = NULL return 0 cdef object _attributeValue(xmlNode* c_element, xmlAttr* c_attrib_node): c_href = _getNs(<xmlNode*>c_attrib_node) value = tree.xmlGetNsProp(c_element, c_attrib_node.name, c_href) try: result = funicode(value) finally: tree.xmlFree(value) return result cdef object _attributeValueFromNsName(xmlNode* c_element, const_xmlChar* c_href, const_xmlChar* c_name): c_result = tree.xmlGetNsProp(c_element, c_name, c_href) if c_result is NULL: return None try: result = funicode(c_result) finally: tree.xmlFree(c_result) return result cdef object _getNodeAttributeValue(xmlNode* c_node, key, default): ns, tag = _getNsTag(key) c_href = <const_xmlChar*>NULL if ns is None else _xcstr(ns) c_result = tree.xmlGetNsProp(c_node, _xcstr(tag), c_href) if c_result is NULL: # XXX free namespace that is not in use..? return default try: result = funicode(c_result) finally: tree.xmlFree(c_result) return result cdef inline object _getAttributeValue(_Element element, key, default): return _getNodeAttributeValue(element._c_node, key, default) cdef int _setAttributeValue(_Element element, key, value) except -1: cdef const_xmlChar* c_value cdef xmlNs* c_ns ns, tag = _getNsTag(key) is_html = element._doc._parser._for_html if not is_html: _attributeValidOrRaise(tag) c_tag = _xcstr(tag) if value is None and is_html: c_value = NULL else: if isinstance(value, QName): value = _resolveQNameText(element, value) else: value = _utf8(value) c_value = _xcstr(value) if ns is None: c_ns = NULL else: c_ns = element._doc._findOrBuildNodeNs(element._c_node, _xcstr(ns), NULL, 1) tree.xmlSetNsProp(element._c_node, c_ns, c_tag, c_value) return 0 cdef int _delAttribute(_Element element, key) except -1: ns, tag = _getNsTag(key) c_href = <const_xmlChar*>NULL if ns is None else _xcstr(ns) if _delAttributeFromNsName(element._c_node, c_href, _xcstr(tag)): raise KeyError, key return 0 cdef int _delAttributeFromNsName(xmlNode* c_node, const_xmlChar* c_href, const_xmlChar* c_name): c_attr = tree.xmlHasNsProp(c_node, c_name, c_href) if c_attr is NULL: # XXX free namespace that is not in use..? return -1 tree.xmlRemoveProp(c_attr) return 0 cdef list _collectAttributes(xmlNode* c_node, int collecttype): u"""Collect all attributes of a node in a list. Depending on collecttype, it collects either the name (1), the value (2) or the name-value tuples. """ cdef Py_ssize_t count c_attr = c_node.properties count = 0 while c_attr is not NULL: if c_attr.type == tree.XML_ATTRIBUTE_NODE: count += 1 c_attr = c_attr.next if not count: return [] attributes = [None] * count c_attr = c_node.properties count = 0 while c_attr is not NULL: if c_attr.type == tree.XML_ATTRIBUTE_NODE: if collecttype == 1: item = _namespacedName(<xmlNode*>c_attr) elif collecttype == 2: item = _attributeValue(c_node, c_attr) else: item = (_namespacedName(<xmlNode*>c_attr), _attributeValue(c_node, c_attr)) attributes[count] = item count += 1 c_attr = c_attr.next return attributes cdef object __RE_XML_ENCODING = re.compile( ur'^(<\?xml[^>]+)\s+encoding\s*=\s*["\'][^"\']*["\'](\s*\?>|)', re.U) cdef object __REPLACE_XML_ENCODING = __RE_XML_ENCODING.sub cdef object __HAS_XML_ENCODING = __RE_XML_ENCODING.match cdef object _stripEncodingDeclaration(object xml_string): # this is a hack to remove the XML encoding declaration from unicode return __REPLACE_XML_ENCODING(ur'\g<1>\g<2>', xml_string) cdef bint _hasEncodingDeclaration(object xml_string) except -1: # check if a (unicode) string has an XML encoding declaration return __HAS_XML_ENCODING(xml_string) is not None cdef inline bint _hasText(xmlNode* c_node): return c_node is not NULL and _textNodeOrSkip(c_node.children) is not NULL cdef inline bint _hasTail(xmlNode* c_node): return c_node is not NULL and _textNodeOrSkip(c_node.next) is not NULL cdef inline bint _hasNonWhitespaceTail(xmlNode* c_node): return _hasNonWhitespaceText(c_node, tail=True) cdef bint _hasNonWhitespaceText(xmlNode* c_node, bint tail=False): c_text_node = c_node and _textNodeOrSkip(c_node.next if tail else c_node.children) if c_text_node is NULL: return False while c_text_node is not NULL: if c_text_node.content[0] != c'\0' and not _collectText(c_text_node).isspace(): return True c_text_node = _textNodeOrSkip(c_text_node.next) return False cdef _collectText(xmlNode* c_node): u"""Collect all text nodes and return them as a unicode string. Start collecting at c_node. If there was no text to collect, return None """ cdef Py_ssize_t scount cdef xmlChar* c_text cdef xmlNode* c_node_cur # check for multiple text nodes scount = 0 c_text = NULL c_node_cur = c_node = _textNodeOrSkip(c_node) while c_node_cur is not NULL: if c_node_cur.content[0] != c'\0': c_text = c_node_cur.content scount += 1 c_node_cur = _textNodeOrSkip(c_node_cur.next) # handle two most common cases first if c_text is NULL: return '' if scount > 0 else None if scount == 1: return funicode(c_text) # the rest is not performance critical anymore result = b'' while c_node is not NULL: result += <unsigned char*>c_node.content c_node = _textNodeOrSkip(c_node.next) return funicode(<const_xmlChar*><unsigned char*>result) cdef void _removeText(xmlNode* c_node): u"""Remove all text nodes. Start removing at c_node. """ cdef xmlNode* c_next c_node = _textNodeOrSkip(c_node) while c_node is not NULL: c_next = _textNodeOrSkip(c_node.next) tree.xmlUnlinkNode(c_node) tree.xmlFreeNode(c_node) c_node = c_next cdef xmlNode* _createTextNode(xmlDoc* doc, value) except NULL: cdef xmlNode* c_text_node if isinstance(value, CDATA): c_text_node = tree.xmlNewCDataBlock( doc, _xcstr((<CDATA>value)._utf8_data), python.PyBytes_GET_SIZE((<CDATA>value)._utf8_data)) else: text = _utf8(value) c_text_node = tree.xmlNewDocText(doc, _xcstr(text)) if not c_text_node: raise MemoryError() return c_text_node cdef int _setNodeText(xmlNode* c_node, value) except -1: # remove all text nodes at the start first _removeText(c_node.children) if value is None: return 0 # now add new text node with value at start c_text_node = _createTextNode(c_node.doc, value) if c_node.children is NULL: tree.xmlAddChild(c_node, c_text_node) else: tree.xmlAddPrevSibling(c_node.children, c_text_node) return 0 cdef int _setTailText(xmlNode* c_node, value) except -1: # remove all text nodes at the start first _removeText(c_node.next) if value is None: return 0 # now append new text node with value c_text_node = _createTextNode(c_node.doc, value) tree.xmlAddNextSibling(c_node, c_text_node) return 0 cdef bytes _resolveQNameText(_Element element, value): cdef xmlNs* c_ns ns, tag = _getNsTag(value) if ns is None: return tag else: c_ns = element._doc._findOrBuildNodeNs( element._c_node, _xcstr(ns), NULL, 0) return python.PyBytes_FromFormat('%s:%s', c_ns.prefix, _cstr(tag)) cdef inline bint _hasChild(xmlNode* c_node): return c_node is not NULL and _findChildForwards(c_node, 0) is not NULL cdef inline Py_ssize_t _countElements(xmlNode* c_node): u"Counts the elements within the following siblings and the node itself." cdef Py_ssize_t count count = 0 while c_node is not NULL: if _isElement(c_node): count += 1 c_node = c_node.next return count cdef int _findChildSlice( slice sliceobject, xmlNode* c_parent, xmlNode** c_start_node, Py_ssize_t* c_step, Py_ssize_t* c_length) except -1: u"""Resolve a children slice. Returns the start node, step size and the slice length in the pointer arguments. """ cdef Py_ssize_t start = 0, stop = 0, childcount childcount = _countElements(c_parent.children) if childcount == 0: c_start_node[0] = NULL c_length[0] = 0 if sliceobject.step is None: c_step[0] = 1 else: python._PyEval_SliceIndex(sliceobject.step, c_step) return 0 python.PySlice_GetIndicesEx( sliceobject, childcount, &start, &stop, c_step, c_length) if start > childcount / 2: c_start_node[0] = _findChildBackwards(c_parent, childcount - start - 1) else: c_start_node[0] = _findChild(c_parent, start) return 0 cdef bint _isFullSlice(slice sliceobject) except -1: u"""Conservative guess if this slice is a full slice as in ``s[:]``. """ cdef Py_ssize_t step = 0 if sliceobject is None: return 0 if sliceobject.start is None and \ sliceobject.stop is None: if sliceobject.step is None: return 1 python._PyEval_SliceIndex(sliceobject.step, &step) if step == 1: return 1 return 0 return 0 cdef _collectChildren(_Element element): cdef xmlNode* c_node cdef list result = [] c_node = element._c_node.children if c_node is not NULL: if not _isElement(c_node): c_node = _nextElement(c_node) while c_node is not NULL: result.append(_elementFactory(element._doc, c_node)) c_node = _nextElement(c_node) return result cdef inline xmlNode* _findChild(xmlNode* c_node, Py_ssize_t index): if index < 0: return _findChildBackwards(c_node, -index - 1) else: return _findChildForwards(c_node, index) cdef inline xmlNode* _findChildForwards(xmlNode* c_node, Py_ssize_t index): u"""Return child element of c_node with index, or return NULL if not found. """ cdef xmlNode* c_child cdef Py_ssize_t c c_child = c_node.children c = 0 while c_child is not NULL: if _isElement(c_child): if c == index: return c_child c += 1 c_child = c_child.next return NULL cdef inline xmlNode* _findChildBackwards(xmlNode* c_node, Py_ssize_t index): u"""Return child element of c_node with index, or return NULL if not found. Search from the end. """ cdef xmlNode* c_child cdef Py_ssize_t c c_child = c_node.last c = 0 while c_child is not NULL: if _isElement(c_child): if c == index: return c_child c += 1 c_child = c_child.prev return NULL cdef inline xmlNode* _textNodeOrSkip(xmlNode* c_node) nogil: u"""Return the node if it's a text node. Skip over ignorable nodes in a series of text nodes. Return NULL if a non-ignorable node is found. This is used to skip over XInclude nodes when collecting adjacent text nodes. """ while c_node is not NULL: if c_node.type == tree.XML_TEXT_NODE or \ c_node.type == tree.XML_CDATA_SECTION_NODE: return c_node elif c_node.type == tree.XML_XINCLUDE_START or \ c_node.type == tree.XML_XINCLUDE_END: c_node = c_node.next else: return NULL return NULL cdef inline xmlNode* _nextElement(xmlNode* c_node): u"""Given a node, find the next sibling that is an element. """ if c_node is NULL: return NULL c_node = c_node.next while c_node is not NULL: if _isElement(c_node): return c_node c_node = c_node.next return NULL cdef inline xmlNode* _previousElement(xmlNode* c_node): u"""Given a node, find the next sibling that is an element. """ if c_node is NULL: return NULL c_node = c_node.prev while c_node is not NULL: if _isElement(c_node): return c_node c_node = c_node.prev return NULL cdef inline xmlNode* _parentElement(xmlNode* c_node): u"Given a node, find the parent element." if c_node is NULL or not _isElement(c_node): return NULL c_node = c_node.parent if c_node is NULL or not _isElement(c_node): return NULL return c_node cdef inline bint _tagMatches(xmlNode* c_node, const_xmlChar* c_href, const_xmlChar* c_name): u"""Tests if the node matches namespace URI and tag name. A node matches if it matches both c_href and c_name. A node matches c_href if any of the following is true: * c_href is NULL * its namespace is NULL and c_href is the empty string * its namespace string equals the c_href string A node matches c_name if any of the following is true: * c_name is NULL * its name string equals the c_name string """ if c_node is NULL: return 0 if c_node.type != tree.XML_ELEMENT_NODE: # not an element, only succeed if we match everything return c_name is NULL and c_href is NULL if c_name is NULL: if c_href is NULL: # always match return 1 else: c_node_href = _getNs(c_node) if c_node_href is NULL: return c_href[0] == c'\0' else: return tree.xmlStrcmp(c_node_href, c_href) == 0 elif c_href is NULL: if _getNs(c_node) is not NULL: return 0 return c_node.name == c_name or tree.xmlStrcmp(c_node.name, c_name) == 0 elif c_node.name == c_name or tree.xmlStrcmp(c_node.name, c_name) == 0: c_node_href = _getNs(c_node) if c_node_href is NULL: return c_href[0] == c'\0' else: return tree.xmlStrcmp(c_node_href, c_href) == 0 else: return 0 cdef inline bint _tagMatchesExactly(xmlNode* c_node, qname* c_qname): u"""Tests if the node matches namespace URI and tag name. This differs from _tagMatches() in that it does not consider a NULL value in qname.href a wildcard, and that it expects the c_name to be taken from the doc dict, i.e. it only compares the names by address. A node matches if it matches both href and c_name of the qname. A node matches c_href if any of the following is true: * its namespace is NULL and c_href is the empty string * its namespace string equals the c_href string A node matches c_name if any of the following is true: * c_name is NULL * its name string points to the same address (!) as c_name """ return _nsTagMatchesExactly(_getNs(c_node), c_node.name, c_qname) cdef inline bint _nsTagMatchesExactly(const_xmlChar* c_node_href, const_xmlChar* c_node_name, qname* c_qname): u"""Tests if name and namespace URI match those of c_qname. This differs from _tagMatches() in that it does not consider a NULL value in qname.href a wildcard, and that it expects the c_name to be taken from the doc dict, i.e. it only compares the names by address. A node matches if it matches both href and c_name of the qname. A node matches c_href if any of the following is true: * its namespace is NULL and c_href is the empty string * its namespace string equals the c_href string A node matches c_name if any of the following is true: * c_name is NULL * its name string points to the same address (!) as c_name """ cdef char* c_href if c_qname.c_name is not NULL and c_qname.c_name is not c_node_name: return 0 if c_qname.href is NULL: return 1 c_href = python.__cstr(c_qname.href) if c_href[0] == '\0': return c_node_href is NULL or c_node_href[0] == '\0' elif c_node_href is NULL: return 0 else: return tree.xmlStrcmp(<const_xmlChar*>c_href, c_node_href) == 0 cdef Py_ssize_t _mapTagsToQnameMatchArray(xmlDoc* c_doc, list ns_tags, qname* c_ns_tags, bint force_into_dict) except -1: u"""Map a sequence of (name, namespace) pairs to a qname array for efficient matching with _tagMatchesExactly() above. Note that each qname struct in the array owns its href byte string object if it is not NULL. """ cdef Py_ssize_t count = 0, i cdef bytes ns, tag for ns, tag in ns_tags: if tag is None: c_tag = <const_xmlChar*>NULL elif force_into_dict: c_tag = tree.xmlDictLookup(c_doc.dict, _xcstr(tag), len(tag)) if c_tag is NULL: # clean up before raising the error for i in xrange(count): cpython.ref.Py_XDECREF(c_ns_tags[i].href) raise MemoryError() else: c_tag = tree.xmlDictExists(c_doc.dict, _xcstr(tag), len(tag)) if c_tag is NULL: # not in the dict => not in the document continue c_ns_tags[count].c_name = c_tag if ns is None: c_ns_tags[count].href = NULL else: cpython.ref.Py_INCREF(ns) # keep an owned reference! c_ns_tags[count].href = <python.PyObject*>ns count += 1 return count cdef int _removeNode(_Document doc, xmlNode* c_node) except -1: u"""Unlink and free a node and subnodes if possible. Otherwise, make sure it's self-contained. """ cdef xmlNode* c_next c_next = c_node.next tree.xmlUnlinkNode(c_node) _moveTail(c_next, c_node) if not attemptDeallocation(c_node): # make namespaces absolute moveNodeToDocument(doc, c_node.doc, c_node) return 0 cdef int _removeSiblings(xmlNode* c_element, tree.xmlElementType node_type, bint with_tail) except -1: cdef xmlNode* c_node cdef xmlNode* c_next c_node = c_element.next while c_node is not NULL: c_next = _nextElement(c_node) if c_node.type == node_type: if with_tail: _removeText(c_node.next) tree.xmlUnlinkNode(c_node) attemptDeallocation(c_node) c_node = c_next c_node = c_element.prev while c_node is not NULL: c_next = _previousElement(c_node) if c_node.type == node_type: if with_tail: _removeText(c_node.next) tree.xmlUnlinkNode(c_node) attemptDeallocation(c_node) c_node = c_next return 0 cdef void _moveTail(xmlNode* c_tail, xmlNode* c_target): cdef xmlNode* c_next # tail support: look for any text nodes trailing this node and # move them too c_tail = _textNodeOrSkip(c_tail) while c_tail is not NULL: c_next = _textNodeOrSkip(c_tail.next) c_target = tree.xmlAddNextSibling(c_target, c_tail) c_tail = c_next cdef int _copyTail(xmlNode* c_tail, xmlNode* c_target) except -1: cdef xmlNode* c_new_tail # tail copying support: look for any text nodes trailing this node and # copy it to the target node c_tail = _textNodeOrSkip(c_tail) while c_tail is not NULL: if c_target.doc is not c_tail.doc: c_new_tail = tree.xmlDocCopyNode(c_tail, c_target.doc, 0) else: c_new_tail = tree.xmlCopyNode(c_tail, 0) if c_new_tail is NULL: raise MemoryError() c_target = tree.xmlAddNextSibling(c_target, c_new_tail) c_tail = _textNodeOrSkip(c_tail.next) return 0 cdef int _copyNonElementSiblings(xmlNode* c_node, xmlNode* c_target) except -1: cdef xmlNode* c_copy cdef xmlNode* c_sibling = c_node while c_sibling.prev != NULL and \ (c_sibling.prev.type == tree.XML_PI_NODE or c_sibling.prev.type == tree.XML_COMMENT_NODE or c_sibling.prev.type == tree.XML_DTD_NODE): c_sibling = c_sibling.prev while c_sibling != c_node: if c_sibling.type == tree.XML_DTD_NODE: c_copy = <xmlNode*>_copyDtd(<tree.xmlDtd*>c_sibling) if c_sibling == <xmlNode*>c_node.doc.intSubset: c_target.doc.intSubset = <tree.xmlDtd*>c_copy else: # c_sibling == c_node.doc.extSubset c_target.doc.extSubset = <tree.xmlDtd*>c_copy else: c_copy = tree.xmlDocCopyNode(c_sibling, c_target.doc, 1) if c_copy is NULL: raise MemoryError() tree.xmlAddPrevSibling(c_target, c_copy) c_sibling = c_sibling.next while c_sibling.next != NULL and \ (c_sibling.next.type == tree.XML_PI_NODE or c_sibling.next.type == tree.XML_COMMENT_NODE): c_sibling = c_sibling.next c_copy = tree.xmlDocCopyNode(c_sibling, c_target.doc, 1) if c_copy is NULL: raise MemoryError() tree.xmlAddNextSibling(c_target, c_copy) cdef int _deleteSlice(_Document doc, xmlNode* c_node, Py_ssize_t count, Py_ssize_t step) except -1: u"""Delete slice, ``count`` items starting with ``c_node`` with a step width of ``step``. """ cdef xmlNode* c_next cdef Py_ssize_t c, i cdef _node_to_node_function next_element if c_node is NULL: return 0 if step > 0: next_element = _nextElement else: step = -step next_element = _previousElement # now start deleting nodes c = 0 c_next = c_node while c_node is not NULL and c < count: for i in range(step): c_next = next_element(c_next) if c_next is NULL: break _removeNode(doc, c_node) c += 1 c_node = c_next return 0 cdef int _replaceSlice(_Element parent, xmlNode* c_node, Py_ssize_t slicelength, Py_ssize_t step, bint left_to_right, elements) except -1: u"""Replace the slice of ``count`` elements starting at ``c_node`` with positive step width ``step`` by the Elements in ``elements``. The direction is given by the boolean argument ``left_to_right``. ``c_node`` may be NULL to indicate the end of the children list. """ cdef xmlNode* c_orig_neighbour cdef xmlNode* c_next cdef xmlDoc* c_source_doc cdef _Element element cdef Py_ssize_t seqlength, i, c cdef _node_to_node_function next_element assert step > 0 if left_to_right: next_element = _nextElement else: next_element = _previousElement if not isinstance(elements, (list, tuple)): elements = list(elements) if step != 1 or not left_to_right: # *replacing* children stepwise with list => check size! seqlength = len(elements) if seqlength != slicelength: raise ValueError, f"attempt to assign sequence of size {seqlength} " \ f"to extended slice of size {slicelength}" if c_node is NULL: # no children yet => add all elements straight away if left_to_right: for element in elements: assert element is not None, u"Node must not be None" _appendChild(parent, element) else: for element in elements: assert element is not None, u"Node must not be None" _prependChild(parent, element) return 0 # remove the elements first as some might be re-added if left_to_right: # L->R, remember left neighbour c_orig_neighbour = _previousElement(c_node) else: # R->L, remember right neighbour c_orig_neighbour = _nextElement(c_node) # We remove the original slice elements one by one. Since we hold # a Python reference to all elements that we will insert, it is # safe to let _removeNode() try (and fail) to free them even if # the element itself or one of its descendents will be reinserted. c = 0 c_next = c_node while c_node is not NULL and c < slicelength: for i in range(step): c_next = next_element(c_next) if c_next is NULL: break _removeNode(parent._doc, c_node) c += 1 c_node = c_next # make sure each element is inserted only once elements = iter(elements) # find the first node right of the new insertion point if left_to_right: if c_orig_neighbour is not NULL: c_node = next_element(c_orig_neighbour) else: # before the first element c_node = _findChildForwards(parent._c_node, 0) elif c_orig_neighbour is NULL: # at the end, but reversed stepping # append one element and go to the next insertion point for element in elements: assert element is not None, u"Node must not be None" _appendChild(parent, element) c_node = element._c_node if slicelength > 0: slicelength -= 1 for i in range(1, step): c_node = next_element(c_node) if c_node is NULL: break break else: c_node = c_orig_neighbour if left_to_right: # adjust step size after removing slice as we are not stepping # over the newly inserted elements step -= 1 # now insert elements where we removed them if c_node is not NULL: for element in elements: assert element is not None, u"Node must not be None" _assertValidNode(element) # move element and tail over c_source_doc = element._c_node.doc c_next = element._c_node.next tree.xmlAddPrevSibling(c_node, element._c_node) _moveTail(c_next, element._c_node) # integrate element into new document moveNodeToDocument(parent._doc, c_source_doc, element._c_node) # stop at the end of the slice if slicelength > 0: slicelength -= 1 for i in range(step): c_node = next_element(c_node) if c_node is NULL: break if c_node is NULL: break else: # everything inserted return 0 # append the remaining elements at the respective end if left_to_right: for element in elements: assert element is not None, u"Node must not be None" _assertValidNode(element) _appendChild(parent, element) else: for element in elements: assert element is not None, u"Node must not be None" _assertValidNode(element) _prependChild(parent, element) return 0 cdef int _linkChild(xmlNode* c_parent, xmlNode* c_node) except -1: """Adaptation of 'xmlAddChild()' that deep-fix the document links iteratively. """ assert _isElement(c_node) c_node.parent = c_parent if c_parent.children is NULL: c_parent.children = c_parent.last = c_node else: c_node.prev = c_parent.last c_parent.last.next = c_node c_parent.last = c_node _setTreeDoc(c_node, c_parent.doc) return 0 cdef int _appendChild(_Element parent, _Element child) except -1: u"""Append a new child to a parent element. """ c_node = child._c_node c_source_doc = c_node.doc # prevent cycles if _isAncestorOrSame(c_node, parent._c_node): raise ValueError("cannot append parent to itself") # store possible text node c_next = c_node.next # move node itself tree.xmlUnlinkNode(c_node) # do not call xmlAddChild() here since it would deep-traverse the tree _linkChild(parent._c_node, c_node) _moveTail(c_next, c_node) # uh oh, elements may be pointing to different doc when # parent element has moved; change them too.. moveNodeToDocument(parent._doc, c_source_doc, c_node) return 0 cdef int _prependChild(_Element parent, _Element child) except -1: u"""Prepend a new child to a parent element. """ c_node = child._c_node c_source_doc = c_node.doc # prevent cycles if _isAncestorOrSame(c_node, parent._c_node): raise ValueError("cannot append parent to itself") # store possible text node c_next = c_node.next # move node itself c_child = _findChildForwards(parent._c_node, 0) if c_child is NULL: tree.xmlUnlinkNode(c_node) # do not call xmlAddChild() here since it would deep-traverse the tree _linkChild(parent._c_node, c_node) else: tree.xmlAddPrevSibling(c_child, c_node) _moveTail(c_next, c_node) # uh oh, elements may be pointing to different doc when # parent element has moved; change them too.. moveNodeToDocument(parent._doc, c_source_doc, c_node) return 0 cdef int _appendSibling(_Element element, _Element sibling) except -1: u"""Add a new sibling behind an element. """ return _addSibling(element, sibling, as_next=True) cdef int _prependSibling(_Element element, _Element sibling) except -1: u"""Add a new sibling before an element. """ return _addSibling(element, sibling, as_next=False) cdef int _addSibling(_Element element, _Element sibling, bint as_next) except -1: c_node = sibling._c_node c_source_doc = c_node.doc # prevent cycles if _isAncestorOrSame(c_node, element._c_node): if element._c_node is c_node: return 0 # nothing to do raise ValueError("cannot add ancestor as sibling, please break cycle first") # store possible text node c_next = c_node.next # move node itself if as_next: tree.xmlAddNextSibling(element._c_node, c_node) else: tree.xmlAddPrevSibling(element._c_node, c_node) _moveTail(c_next, c_node) # uh oh, elements may be pointing to different doc when # parent element has moved; change them too.. moveNodeToDocument(element._doc, c_source_doc, c_node) return 0 cdef inline bint isutf8(const_xmlChar* s): cdef xmlChar c = s[0] while c != c'\0': if c & 0x80: return True s += 1 c = s[0] return False cdef bint isutf8l(const_xmlChar* s, size_t length): """ Search for non-ASCII characters in the string, knowing its length in advance. """ cdef unsigned int i cdef unsigned long non_ascii_mask cdef const unsigned long *lptr = <const unsigned long*> s cdef const unsigned long *end = lptr + length // sizeof(unsigned long) if length >= sizeof(non_ascii_mask): # Build constant 0x80808080... mask (and let the C compiler fold it). non_ascii_mask = 0 for i in range(sizeof(non_ascii_mask) // 2): non_ascii_mask = (non_ascii_mask << 16) | 0x8080 # Advance to long-aligned character before we start reading longs. while (<size_t>s) % sizeof(unsigned long) and s < <const_xmlChar *>end: if s[0] & 0x80: return True s += 1 # Read one long at a time lptr = <const unsigned long*> s while lptr < end: if lptr[0] & non_ascii_mask: return True lptr += 1 s = <const_xmlChar *>lptr while s < (<const_xmlChar *>end + length % sizeof(unsigned long)): if s[0] & 0x80: return True s += 1 return False cdef int _is_valid_xml_ascii(bytes pystring): """Check if a string is XML ascii content.""" cdef signed char ch # When ch is a *signed* char, non-ascii characters are negative integers # and xmlIsChar_ch does not accept them. for ch in pystring: if not tree.xmlIsChar_ch(ch): return 0 return 1 cdef bint _is_valid_xml_utf8(bytes pystring): u"""Check if a string is like valid UTF-8 XML content.""" cdef const_xmlChar* s = _xcstr(pystring) cdef const_xmlChar* c_end = s + len(pystring) cdef unsigned long next3 = 0 if s < c_end - 2: next3 = (s[0] << 8) | (s[1]) while s < c_end - 2: next3 = 0x00ffffff & ((next3 << 8) | s[2]) if s[0] & 0x80: # 0xefbfbe and 0xefbfbf are utf-8 encodings of # forbidden characters \ufffe and \uffff if next3 == 0x00efbfbe or next3 == 0x00efbfbf: return 0 # 0xeda080 and 0xedbfbf are utf-8 encodings of # \ud800 and \udfff. Anything between them (inclusive) # is forbidden, because they are surrogate blocks in utf-16. if 0x00eda080 <= next3 <= 0x00edbfbf: return 0 elif not tree.xmlIsChar_ch(s[0]): return 0 # invalid ascii char s += 1 while s < c_end: if not s[0] & 0x80 and not tree.xmlIsChar_ch(s[0]): return 0 # invalid ascii char s += 1 return 1 cdef inline object funicodeOrNone(const_xmlChar* s): return funicode(s) if s is not NULL else None cdef inline object funicodeOrEmpty(const_xmlChar* s): return funicode(s) if s is not NULL else '' cdef object funicode(const_xmlChar* s): cdef Py_ssize_t slen cdef const_xmlChar* spos cdef bint is_non_ascii if python.LXML_UNICODE_STRINGS: return s.decode('UTF-8') spos = s is_non_ascii = 0 while spos[0] != c'\0': if spos[0] & 0x80: is_non_ascii = 1 break spos += 1 slen = spos - s if spos[0] != c'\0': slen += cstring_h.strlen(<const char*> spos) if is_non_ascii: return s[:slen].decode('UTF-8') return <bytes>s[:slen] cdef bytes _utf8(object s): """Test if a string is valid user input and encode it to UTF-8. Reject all bytes/unicode input that contains non-XML characters. Reject all bytes input that contains non-ASCII characters. """ cdef int valid cdef bytes utf8_string if python.IS_PYTHON2 and type(s) is bytes: utf8_string = <bytes>s valid = _is_valid_xml_ascii(utf8_string) elif isinstance(s, unicode): utf8_string = (<unicode>s).encode('utf8') valid = _is_valid_xml_utf8(utf8_string) elif isinstance(s, (bytes, bytearray)): utf8_string = bytes(s) valid = _is_valid_xml_ascii(utf8_string) else: raise TypeError("Argument must be bytes or unicode, got '%.200s'" % type(s).__name__) if not valid: raise ValueError( "All strings must be XML compatible: Unicode or ASCII, no NULL bytes or control characters") return utf8_string cdef bytes _utf8orNone(object s): return _utf8(s) if s is not None else None cdef strrepr(s): """Build a representation of strings which we can use in __repr__ methods, e.g. _Element.__repr__(). """ return s.encode('unicode-escape') if python.IS_PYTHON2 else s cdef enum: NO_FILE_PATH = 0 ABS_UNIX_FILE_PATH = 1 ABS_WIN_FILE_PATH = 2 REL_FILE_PATH = 3 cdef bint _isFilePath(const_xmlChar* c_path): u"simple heuristic to see if a path is a filename" cdef xmlChar c # test if it looks like an absolute Unix path or a Windows network path if c_path[0] == c'/': return ABS_UNIX_FILE_PATH # test if it looks like an absolute Windows path or URL if c'a' <= c_path[0] <= c'z' or c'A' <= c_path[0] <= c'Z': c_path += 1 if c_path[0] == c':' and c_path[1] in b'\0\\': return ABS_WIN_FILE_PATH # C: or C:\... # test if it looks like a URL with scheme:// while c'a' <= c_path[0] <= c'z' or c'A' <= c_path[0] <= c'Z': c_path += 1 if c_path[0] == c':' and c_path[1] == c'/' and c_path[2] == c'/': return NO_FILE_PATH # assume it's a relative path return REL_FILE_PATH cdef object _NO_FSPATH = object() cdef object _getFSPathOrObject(object obj): """ Get the __fspath__ attribute of an object if it exists. Otherwise, the original object is returned. """ if _isString(obj): return obj if python.PY_VERSION_HEX >= 0x03060000: try: return python.PY_FSPath(obj) except TypeError: return obj fspath = getattr(obj, '__fspath__', _NO_FSPATH) if fspath is not _NO_FSPATH and callable(fspath): return fspath() return obj cdef object _encodeFilename(object filename): u"""Make sure a filename is 8-bit encoded (or None). """ if filename is None: return None elif isinstance(filename, bytes): return filename elif isinstance(filename, unicode): filename8 = (<unicode>filename).encode('utf8') if _isFilePath(<unsigned char*>filename8): try: return python.PyUnicode_AsEncodedString( filename, _C_FILENAME_ENCODING, NULL) except UnicodeEncodeError: pass return filename8 else: raise TypeError("Argument must be string or unicode.") cdef object _decodeFilename(const_xmlChar* c_path): u"""Make the filename a unicode string if we are in Py3. """ return _decodeFilenameWithLength(c_path, tree.xmlStrlen(c_path)) cdef object _decodeFilenameWithLength(const_xmlChar* c_path, size_t c_len): u"""Make the filename a unicode string if we are in Py3. """ if _isFilePath(c_path): try: return python.PyUnicode_Decode( <const_char*>c_path, c_len, _C_FILENAME_ENCODING, NULL) except UnicodeDecodeError: pass try: return (<unsigned char*>c_path)[:c_len].decode('UTF-8') except UnicodeDecodeError: # this is a stupid fallback, but it might still work... return (<unsigned char*>c_path)[:c_len].decode('latin-1', 'replace') cdef object _encodeFilenameUTF8(object filename): u"""Recode filename as UTF-8. Tries ASCII, local filesystem encoding and UTF-8 as source encoding. """ cdef char* c_filename if filename is None: return None elif isinstance(filename, bytes): if not isutf8l(<bytes>filename, len(<bytes>filename)): # plain ASCII! return filename c_filename = _cstr(<bytes>filename) try: # try to decode with default encoding filename = python.PyUnicode_Decode( c_filename, len(<bytes>filename), _C_FILENAME_ENCODING, NULL) except UnicodeDecodeError as decode_exc: try: # try if it's proper UTF-8 (<bytes>filename).decode('utf8') return filename except UnicodeDecodeError: raise decode_exc # otherwise re-raise original exception if isinstance(filename, unicode): return (<unicode>filename).encode('utf8') else: raise TypeError("Argument must be string or unicode.") cdef tuple _getNsTag(tag): u"""Given a tag, find namespace URI and tag name. Return None for NS uri if no namespace URI provided. """ return __getNsTag(tag, 0) cdef tuple _getNsTagWithEmptyNs(tag): u"""Given a tag, find namespace URI and tag name. Return None for NS uri if no namespace URI provided, or the empty string if namespace part is '{}'. """ return __getNsTag(tag, 1) cdef tuple __getNsTag(tag, bint empty_ns): cdef char* c_tag cdef char* c_ns_end cdef Py_ssize_t taglen cdef Py_ssize_t nslen cdef bytes ns = None # _isString() is much faster than isinstance() if not _isString(tag) and isinstance(tag, QName): tag = (<QName>tag).text tag = _utf8(tag) c_tag = _cstr(tag) if c_tag[0] == c'{': c_tag += 1 c_ns_end = cstring_h.strchr(c_tag, c'}') if c_ns_end is NULL: raise ValueError, u"Invalid tag name" nslen = c_ns_end - c_tag taglen = python.PyBytes_GET_SIZE(tag) - nslen - 2 if taglen == 0: raise ValueError, u"Empty tag name" if nslen > 0: ns = <bytes>c_tag[:nslen] elif empty_ns: ns = b'' tag = <bytes>c_ns_end[1:taglen+1] elif python.PyBytes_GET_SIZE(tag) == 0: raise ValueError, u"Empty tag name" return ns, tag cdef inline int _pyXmlNameIsValid(name_utf8): return _xmlNameIsValid(_xcstr(name_utf8)) and b':' not in name_utf8 cdef inline int _pyHtmlNameIsValid(name_utf8): return _htmlNameIsValid(_xcstr(name_utf8)) cdef inline int _xmlNameIsValid(const_xmlChar* c_name): return tree.xmlValidateNameValue(c_name) cdef int _htmlNameIsValid(const_xmlChar* c_name): if c_name is NULL or c_name[0] == c'\0': return 0 while c_name[0] != c'\0': if c_name[0] in b'&<>/"\'\t\n\x0B\x0C\r ': return 0 c_name += 1 return 1 cdef bint _characterReferenceIsValid(const_xmlChar* c_name): cdef bint is_hex if c_name[0] == c'x': c_name += 1 is_hex = 1 else: is_hex = 0 if c_name[0] == c'\0': return 0 while c_name[0] != c'\0': if c_name[0] < c'0' or c_name[0] > c'9': if not is_hex: return 0 if not (c'a' <= c_name[0] <= c'f'): if not (c'A' <= c_name[0] <= c'F'): return 0 c_name += 1 return 1 cdef int _tagValidOrRaise(tag_utf) except -1: if not _pyXmlNameIsValid(tag_utf): raise ValueError(f"Invalid tag name {(<bytes>tag_utf).decode('utf8')!r}") return 0 cdef int _htmlTagValidOrRaise(tag_utf) except -1: if not _pyHtmlNameIsValid(tag_utf): raise ValueError(f"Invalid HTML tag name {(<bytes>tag_utf).decode('utf8')!r}") return 0 cdef int _attributeValidOrRaise(name_utf) except -1: if not _pyXmlNameIsValid(name_utf): raise ValueError(f"Invalid attribute name {(<bytes>name_utf).decode('utf8')!r}") return 0 cdef int _prefixValidOrRaise(tag_utf) except -1: if not _pyXmlNameIsValid(tag_utf): raise ValueError(f"Invalid namespace prefix {(<bytes>tag_utf).decode('utf8')!r}") return 0 cdef int _uriValidOrRaise(uri_utf) except -1: cdef uri.xmlURI* c_uri = uri.xmlParseURI(_cstr(uri_utf)) if c_uri is NULL: raise ValueError(f"Invalid namespace URI {(<bytes>uri_utf).decode('utf8')!r}") uri.xmlFreeURI(c_uri) return 0 cdef inline object _namespacedName(xmlNode* c_node): return _namespacedNameFromNsName(_getNs(c_node), c_node.name) cdef object _namespacedNameFromNsName(const_xmlChar* href, const_xmlChar* name): if href is NULL: return funicode(name) elif not python.IS_PYPY and (python.LXML_UNICODE_STRINGS or isutf8(name) or isutf8(href)): return python.PyUnicode_FromFormat("{%s}%s", href, name) else: s = python.PyBytes_FromFormat("{%s}%s", href, name) if python.IS_PYPY and (python.LXML_UNICODE_STRINGS or isutf8l(s, len(s))): return (<bytes>s).decode('utf8') else: return s cdef _getFilenameForFile(source): u"""Given a Python File or Gzip object, give filename back. Returns None if not a file object. """ # urllib2 provides a geturl() method try: return source.geturl() except: pass # file instances have a name attribute try: filename = source.name if _isString(filename): return os_path_abspath(filename) except: pass # gzip file instances have a filename attribute (before Py3k) try: filename = source.filename if _isString(filename): return os_path_abspath(filename) except: pass # can't determine filename return None
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