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# ObjectPath
ctypedef struct _ObjectPath:
const_xmlChar* href
const_xmlChar* name
Py_ssize_t index
cdef object _NO_DEFAULT = object()
cdef class ObjectPath:
u"""ObjectPath(path)
Immutable object that represents a compiled object path.
Example for a path: 'root.child[1].{other}child[25]'
"""
cdef readonly object find
cdef list _path
cdef object _path_str
cdef _ObjectPath* _c_path
cdef Py_ssize_t _path_len
def __init__(self, path):
if python._isString(path):
self._path = _parse_object_path_string(path)
self._path_str = path
else:
self._path = _parse_object_path_list(path)
self._path_str = u'.'.join(path)
self._path_len = len(self._path)
self._c_path = _build_object_path_segments(self._path)
self.find = self.__call__
def __dealloc__(self):
if self._c_path is not NULL:
python.lxml_free(self._c_path)
def __str__(self):
return self._path_str
def __call__(self, _Element root not None, *_default):
u"""Follow the attribute path in the object structure and return the
target attribute value.
If it it not found, either returns a default value (if one was passed
as second argument) or raises AttributeError.
"""
if _default:
if len(_default) > 1:
raise TypeError, u"invalid number of arguments: needs one or two"
default = _default[0]
else:
default = _NO_DEFAULT
return _find_object_path(root, self._c_path, self._path_len, default)
def hasattr(self, _Element root not None):
u"hasattr(self, root)"
try:
_find_object_path(root, self._c_path, self._path_len, _NO_DEFAULT)
except AttributeError:
return False
return True
def setattr(self, _Element root not None, value):
u"""setattr(self, root, value)
Set the value of the target element in a subtree.
If any of the children on the path does not exist, it is created.
"""
_create_object_path(root, self._c_path, self._path_len, 1, value)
def addattr(self, _Element root not None, value):
u"""addattr(self, root, value)
Append a value to the target element in a subtree.
If any of the children on the path does not exist, it is created.
"""
_create_object_path(root, self._c_path, self._path_len, 0, value)
cdef object __MATCH_PATH_SEGMENT = re.compile(
ur"(\.?)\s*(?:\{([^}]*)\})?\s*([^.{}\[\]\s]+)\s*(?:\[\s*([-0-9]+)\s*\])?",
re.U).match
cdef tuple _RELATIVE_PATH_SEGMENT = (None, None, 0)
cdef list _parse_object_path_string(_path):
u"""Parse object path string into a (ns, name, index) list.
"""
cdef bint has_dot
cdef unicode path
new_path = []
if isinstance(_path, bytes):
path = (<bytes>_path).decode('ascii')
elif type(_path) is not unicode:
path = unicode(_path)
else:
path = _path
path = path.strip()
if path == u'.':
return [_RELATIVE_PATH_SEGMENT]
path_pos = 0
while path:
match = __MATCH_PATH_SEGMENT(path, path_pos)
if match is None:
break
dot, ns, name, index = match.groups()
index = int(index) if index else 0
has_dot = dot == u'.'
if not new_path:
if has_dot:
# path '.child' => ignore root
new_path.append(_RELATIVE_PATH_SEGMENT)
elif index:
raise ValueError, u"index not allowed on root node"
elif not has_dot:
raise ValueError, u"invalid path"
if ns is not None:
ns = python.PyUnicode_AsUTF8String(ns)
name = python.PyUnicode_AsUTF8String(name)
new_path.append( (ns, name, index) )
path_pos = match.end()
if not new_path or len(path) > path_pos:
raise ValueError, u"invalid path"
return new_path
cdef list _parse_object_path_list(path):
u"""Parse object path sequence into a (ns, name, index) list.
"""
new_path = []
for item in path:
item = item.strip()
if not new_path and item == u'':
# path '.child' => ignore root
ns = name = None
index = 0
else:
ns, name = cetree.getNsTag(item)
c_name = _xcstr(name)
index_pos = tree.xmlStrchr(c_name, c'[')
if index_pos is NULL:
index = 0
else:
index_end = tree.xmlStrchr(index_pos + 1, c']')
if index_end is NULL:
raise ValueError, u"index must be enclosed in []"
index = int(index_pos[1:index_end - index_pos])
if not new_path and index != 0:
raise ValueError, u"index not allowed on root node"
name = <bytes>c_name[:index_pos - c_name]
new_path.append( (ns, name, index) )
if not new_path:
raise ValueError, u"invalid path"
return new_path
cdef _ObjectPath* _build_object_path_segments(list path_list) except NULL:
cdef _ObjectPath* c_path
cdef _ObjectPath* c_path_segments
c_path_segments = <_ObjectPath*>python.lxml_malloc(len(path_list), sizeof(_ObjectPath))
if c_path_segments is NULL:
raise MemoryError()
c_path = c_path_segments
for href, name, index in path_list:
c_path[0].href = _xcstr(href) if href is not None else NULL
c_path[0].name = _xcstr(name) if name is not None else NULL
c_path[0].index = index
c_path += 1
return c_path_segments
cdef _find_object_path(_Element root, _ObjectPath* c_path, Py_ssize_t c_path_len, default_value):
u"""Follow the path to find the target element.
"""
cdef tree.xmlNode* c_node
cdef Py_ssize_t c_index
c_node = root._c_node
c_name = c_path[0].name
c_href = c_path[0].href
if c_href is NULL or c_href[0] == c'\0':
c_href = tree._getNs(c_node)
if not cetree.tagMatches(c_node, c_href, c_name):
if default_value is not _NO_DEFAULT:
return default_value
else:
raise ValueError(
f"root element does not match: need {cetree.namespacedNameFromNsName(c_href, c_name)}, got {root.tag}")
while c_node is not NULL:
c_path_len -= 1
if c_path_len <= 0:
break
c_path += 1
if c_path[0].href is not NULL:
c_href = c_path[0].href # otherwise: keep parent namespace
c_name = tree.xmlDictExists(c_node.doc.dict, c_path[0].name, -1)
if c_name is NULL:
c_name = c_path[0].name
c_node = NULL
break
c_index = c_path[0].index
c_node = c_node.last if c_index < 0 else c_node.children
c_node = _findFollowingSibling(c_node, c_href, c_name, c_index)
if c_node is not NULL:
return cetree.elementFactory(root._doc, c_node)
elif default_value is not _NO_DEFAULT:
return default_value
else:
tag = cetree.namespacedNameFromNsName(c_href, c_name)
raise AttributeError, f"no such child: {tag}"
cdef _create_object_path(_Element root, _ObjectPath* c_path,
Py_ssize_t c_path_len, int replace, value):
u"""Follow the path to find the target element, build the missing children
as needed and set the target element to 'value'. If replace is true, an
existing value is replaced, otherwise the new value is added.
"""
cdef _Element child
cdef tree.xmlNode* c_node
cdef tree.xmlNode* c_child
cdef Py_ssize_t c_index
if c_path_len == 1:
raise TypeError, u"cannot update root node"
c_node = root._c_node
c_name = c_path[0].name
c_href = c_path[0].href
if c_href is NULL or c_href[0] == c'\0':
c_href = tree._getNs(c_node)
if not cetree.tagMatches(c_node, c_href, c_name):
raise ValueError(
f"root element does not match: need {cetree.namespacedNameFromNsName(c_href, c_name)}, got {root.tag}")
while c_path_len > 1:
c_path_len -= 1
c_path += 1
if c_path[0].href is not NULL:
c_href = c_path[0].href # otherwise: keep parent namespace
c_index = c_path[0].index
c_name = tree.xmlDictExists(c_node.doc.dict, c_path[0].name, -1)
if c_name is NULL:
c_name = c_path[0].name
c_child = NULL
else:
c_child = c_node.last if c_index < 0 else c_node.children
c_child = _findFollowingSibling(c_child, c_href, c_name, c_index)
if c_child is not NULL:
c_node = c_child
elif c_index != 0:
raise TypeError, u"creating indexed path attributes is not supported"
elif c_path_len == 1:
_appendValue(cetree.elementFactory(root._doc, c_node),
cetree.namespacedNameFromNsName(c_href, c_name),
value)
return
else:
child = cetree.makeSubElement(
cetree.elementFactory(root._doc, c_node),
cetree.namespacedNameFromNsName(c_href, c_name),
None, None, None, None)
c_node = child._c_node
# if we get here, the entire path was already there
if replace:
element = cetree.elementFactory(root._doc, c_node)
_replaceElement(element, value)
else:
_appendValue(cetree.elementFactory(root._doc, c_node.parent),
cetree.namespacedName(c_node), value)
cdef list _build_descendant_paths(tree.xmlNode* c_node, prefix_string):
u"""Returns a list of all descendant paths.
"""
cdef list path, path_list
tag = cetree.namespacedName(c_node)
if prefix_string:
if prefix_string[-1] != u'.':
prefix_string += u'.'
prefix_string = prefix_string + tag
else:
prefix_string = tag
path = [prefix_string]
path_list = []
_recursive_build_descendant_paths(c_node, path, path_list)
return path_list
cdef int _recursive_build_descendant_paths(tree.xmlNode* c_node,
list path, list path_list) except -1:
u"""Fills the list 'path_list' with all descendant paths, initial prefix
being in the list 'path'.
"""
cdef tree.xmlNode* c_child
tags = {}
path_list.append(u'.'.join(path))
c_href = tree._getNs(c_node)
c_child = c_node.children
while c_child is not NULL:
while c_child.type != tree.XML_ELEMENT_NODE:
c_child = c_child.next
if c_child is NULL:
return 0
if c_href is tree._getNs(c_child):
tag = pyunicode(c_child.name)
elif c_href is not NULL and tree._getNs(c_child) is NULL:
# special case: parent has namespace, child does not
tag = u'{}' + pyunicode(c_child.name)
else:
tag = cetree.namespacedName(c_child)
count = tags.get(tag)
if count is None:
tags[tag] = 1
else:
tags[tag] = count + 1
tag += f'[{count}]'
path.append(tag)
_recursive_build_descendant_paths(c_child, path, path_list)
del path[-1]
c_child = c_child.next
return 0