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EDIT :: readonlytree.pxi

# read-only tree implementation @cython.internal cdef class _ReadOnlyProxy: u"A read-only proxy class suitable for PIs/Comments (for internal use only!)." cdef bint _free_after_use cdef xmlNode* _c_node cdef _ReadOnlyProxy _source_proxy cdef list _dependent_proxies def __cinit__(self): self._c_node = NULL self._free_after_use = 0 cdef int _assertNode(self) except -1: u"""This is our way of saying: this proxy is invalid! """ if not self._c_node: raise ReferenceError("Proxy invalidated!") return 0 cdef int _raise_unsupported_type(self) except -1: raise TypeError(f"Unsupported node type: {self._c_node.type}") cdef void free_after_use(self): u"""Should the xmlNode* be freed when releasing the proxy? """ self._free_after_use = 1 @property def tag(self): """Element tag """ self._assertNode() if self._c_node.type == tree.XML_ELEMENT_NODE: return _namespacedName(self._c_node) elif self._c_node.type == tree.XML_PI_NODE: return ProcessingInstruction elif self._c_node.type == tree.XML_COMMENT_NODE: return Comment elif self._c_node.type == tree.XML_ENTITY_REF_NODE: return Entity else: self._raise_unsupported_type() @property def text(self): """Text before the first subelement. This is either a string or the value None, if there was no text. """ self._assertNode() if self._c_node.type == tree.XML_ELEMENT_NODE: return _collectText(self._c_node.children) elif self._c_node.type in (tree.XML_PI_NODE, tree.XML_COMMENT_NODE): if self._c_node.content is NULL: return '' else: return funicode(self._c_node.content) elif self._c_node.type == tree.XML_ENTITY_REF_NODE: return f'&{funicode(self._c_node.name)};' else: self._raise_unsupported_type() @property def tail(self): """Text after this element's end tag, but before the next sibling element's start tag. This is either a string or the value None, if there was no text. """ self._assertNode() return _collectText(self._c_node.next) @property def sourceline(self): """Original line number as found by the parser or None if unknown. """ cdef long line self._assertNode() line = tree.xmlGetLineNo(self._c_node) if line > 0: return line else: return None def __repr__(self): self._assertNode() if self._c_node.type == tree.XML_ELEMENT_NODE: return "<Element %s at 0x%x>" % (strrepr(self.tag), id(self)) elif self._c_node.type == tree.XML_COMMENT_NODE: return "<!--%s-->" % strrepr(self.text) elif self._c_node.type == tree.XML_ENTITY_NODE: return "&%s;" % strrepr(funicode(self._c_node.name)) elif self._c_node.type == tree.XML_PI_NODE: text = self.text if text: return "<?%s %s?>" % (strrepr(self.target), text) else: return "<?%s?>" % strrepr(self.target) else: self._raise_unsupported_type() def __getitem__(self, x): u"""Returns the subelement at the given position or the requested slice. """ cdef xmlNode* c_node = NULL cdef Py_ssize_t step = 0, slicelength = 0 cdef Py_ssize_t c, i cdef _node_to_node_function next_element cdef list result self._assertNode() if isinstance(x, slice): # slicing if _isFullSlice(<slice>x): return _collectChildren(self) _findChildSlice(<slice>x, self._c_node, &c_node, &step, &slicelength) if c_node is NULL: return [] if step > 0: next_element = _nextElement else: step = -step next_element = _previousElement result = [] c = 0 while c_node is not NULL and c < slicelength: result.append(_newReadOnlyProxy(self._source_proxy, c_node)) result.append(_elementFactory(self._doc, c_node)) c = c + 1 for i from 0 <= i < step: c_node = next_element(c_node) return result else: # indexing c_node = _findChild(self._c_node, x) if c_node is NULL: raise IndexError, u"list index out of range" return _newReadOnlyProxy(self._source_proxy, c_node) def __len__(self): u"""Returns the number of subelements. """ cdef Py_ssize_t c cdef xmlNode* c_node self._assertNode() c = 0 c_node = self._c_node.children while c_node is not NULL: if tree._isElement(c_node): c = c + 1 c_node = c_node.next return c def __nonzero__(self): cdef xmlNode* c_node self._assertNode() c_node = _findChildBackwards(self._c_node, 0) return c_node != NULL def __deepcopy__(self, memo): u"__deepcopy__(self, memo)" return self.__copy__() cpdef __copy__(self): u"__copy__(self)" cdef xmlDoc* c_doc cdef xmlNode* c_node cdef _Document new_doc if self._c_node is NULL: return self c_doc = _copyDocRoot(self._c_node.doc, self._c_node) # recursive new_doc = _documentFactory(c_doc, None) root = new_doc.getroot() if root is not None: return root # Comment/PI c_node = c_doc.children while c_node is not NULL and c_node.type != self._c_node.type: c_node = c_node.next if c_node is NULL: return None return _elementFactory(new_doc, c_node) def __iter__(self): return iter(self.getchildren()) def iterchildren(self, tag=None, *, reversed=False): u"""iterchildren(self, tag=None, reversed=False) Iterate over the children of this element. """ children = self.getchildren() if tag is not None and tag != '*': children = [ el for el in children if el.tag == tag ] if reversed: children = children[::-1] return iter(children) cpdef getchildren(self): u"""Returns all subelements. The elements are returned in document order. """ cdef xmlNode* c_node cdef list result self._assertNode() result = [] c_node = self._c_node.children while c_node is not NULL: if tree._isElement(c_node): result.append(_newReadOnlyProxy(self._source_proxy, c_node)) c_node = c_node.next return result def getparent(self): u"""Returns the parent of this element or None for the root element. """ cdef xmlNode* c_parent self._assertNode() c_parent = self._c_node.parent if c_parent is NULL or not tree._isElement(c_parent): return None else: return _newReadOnlyProxy(self._source_proxy, c_parent) def getnext(self): u"""Returns the following sibling of this element or None. """ cdef xmlNode* c_node self._assertNode() c_node = _nextElement(self._c_node) if c_node is not NULL: return _newReadOnlyProxy(self._source_proxy, c_node) return None def getprevious(self): u"""Returns the preceding sibling of this element or None. """ cdef xmlNode* c_node self._assertNode() c_node = _previousElement(self._c_node) if c_node is not NULL: return _newReadOnlyProxy(self._source_proxy, c_node) return None @cython.final @cython.internal cdef class _ReadOnlyPIProxy(_ReadOnlyProxy): """A read-only proxy for processing instructions (for internal use only!)""" @property def target(self): self._assertNode() return funicode(self._c_node.name) @cython.final @cython.internal cdef class _ReadOnlyEntityProxy(_ReadOnlyProxy): """A read-only proxy for entity references (for internal use only!)""" property name: def __get__(self): return funicode(self._c_node.name) def __set__(self, value): value_utf = _utf8(value) if u'&' in value or u';' in value: raise ValueError(f"Invalid entity name '{value}'") tree.xmlNodeSetName(self._c_node, _xcstr(value_utf)) @property def text(self): return f'&{funicode(self._c_node.name)};' @cython.internal cdef class _ReadOnlyElementProxy(_ReadOnlyProxy): """The main read-only Element proxy class (for internal use only!).""" @property def attrib(self): self._assertNode() return dict(_collectAttributes(self._c_node, 3)) @property def prefix(self): """Namespace prefix or None. """ self._assertNode() if self._c_node.ns is not NULL: if self._c_node.ns.prefix is not NULL: return funicode(self._c_node.ns.prefix) return None @property def nsmap(self): """Namespace prefix->URI mapping known in the context of this Element. This includes all namespace declarations of the parents. Note that changing the returned dict has no effect on the Element. """ self._assertNode() return _build_nsmap(self._c_node) def get(self, key, default=None): u"""Gets an element attribute. """ self._assertNode() return _getNodeAttributeValue(self._c_node, key, default) def keys(self): u"""Gets a list of attribute names. The names are returned in an arbitrary order (just like for an ordinary Python dictionary). """ self._assertNode() return _collectAttributes(self._c_node, 1) def values(self): u"""Gets element attributes, as a sequence. The attributes are returned in an arbitrary order. """ self._assertNode() return _collectAttributes(self._c_node, 2) def items(self): u"""Gets element attributes, as a sequence. The attributes are returned in an arbitrary order. """ self._assertNode() return _collectAttributes(self._c_node, 3) cdef _ReadOnlyProxy _newReadOnlyProxy( _ReadOnlyProxy source_proxy, xmlNode* c_node): cdef _ReadOnlyProxy el if c_node.type == tree.XML_ELEMENT_NODE: el = _ReadOnlyElementProxy.__new__(_ReadOnlyElementProxy) elif c_node.type == tree.XML_PI_NODE: el = _ReadOnlyPIProxy.__new__(_ReadOnlyPIProxy) elif c_node.type in (tree.XML_COMMENT_NODE, tree.XML_ENTITY_REF_NODE): el = _ReadOnlyProxy.__new__(_ReadOnlyProxy) else: raise TypeError(f"Unsupported element type: {c_node.type}") el._c_node = c_node _initReadOnlyProxy(el, source_proxy) return el cdef inline _initReadOnlyProxy(_ReadOnlyProxy el, _ReadOnlyProxy source_proxy): if source_proxy is None: el._source_proxy = el el._dependent_proxies = [el] else: el._source_proxy = source_proxy source_proxy._dependent_proxies.append(el) cdef _freeReadOnlyProxies(_ReadOnlyProxy sourceProxy): cdef xmlNode* c_node cdef _ReadOnlyProxy el if sourceProxy is None: return if sourceProxy._dependent_proxies is None: return for el in sourceProxy._dependent_proxies: c_node = el._c_node el._c_node = NULL if el._free_after_use: tree.xmlFreeNode(c_node) del sourceProxy._dependent_proxies[:] # opaque wrapper around non-element nodes, e.g. the document node # # This class does not imply any restrictions on modifiability or # read-only status of the node, so use with caution. @cython.internal cdef class _OpaqueNodeWrapper: cdef tree.xmlNode* _c_node def __init__(self): raise TypeError, u"This type cannot be instantiated from Python" @cython.final @cython.internal cdef class _OpaqueDocumentWrapper(_OpaqueNodeWrapper): cdef int _assertNode(self) except -1: u"""This is our way of saying: this proxy is invalid! """ assert self._c_node is not NULL, u"Proxy invalidated!" return 0 cpdef append(self, other_element): u"""Append a copy of an Element to the list of children. """ cdef xmlNode* c_next cdef xmlNode* c_node self._assertNode() c_node = _roNodeOf(other_element) if c_node.type == tree.XML_ELEMENT_NODE: if tree.xmlDocGetRootElement(<tree.xmlDoc*>self._c_node) is not NULL: raise ValueError, u"cannot append, document already has a root element" elif c_node.type not in (tree.XML_PI_NODE, tree.XML_COMMENT_NODE): raise TypeError, f"unsupported element type for top-level node: {c_node.type}" c_node = _copyNodeToDoc(c_node, <tree.xmlDoc*>self._c_node) c_next = c_node.next tree.xmlAddChild(self._c_node, c_node) _moveTail(c_next, c_node) def extend(self, elements): u"""Append a copy of all Elements from a sequence to the list of children. """ self._assertNode() for element in elements: self.append(element) cdef _OpaqueNodeWrapper _newOpaqueAppendOnlyNodeWrapper(xmlNode* c_node): cdef _OpaqueNodeWrapper node if c_node.type in (tree.XML_DOCUMENT_NODE, tree.XML_HTML_DOCUMENT_NODE): node = _OpaqueDocumentWrapper.__new__(_OpaqueDocumentWrapper) else: node = _OpaqueNodeWrapper.__new__(_OpaqueNodeWrapper) node._c_node = c_node return node # element proxies that allow restricted modification @cython.internal cdef class _ModifyContentOnlyProxy(_ReadOnlyProxy): u"""A read-only proxy that allows changing the text content. """ property text: def __get__(self): self._assertNode() if self._c_node.content is NULL: return '' else: return funicode(self._c_node.content) def __set__(self, value): cdef tree.xmlDict* c_dict self._assertNode() if value is None: c_text = <const_xmlChar*>NULL else: value = _utf8(value) c_text = _xcstr(value) tree.xmlNodeSetContent(self._c_node, c_text) @cython.final @cython.internal cdef class _ModifyContentOnlyPIProxy(_ModifyContentOnlyProxy): """A read-only proxy that allows changing the text/target content of a processing instruction. """ property target: def __get__(self): self._assertNode() return funicode(self._c_node.name) def __set__(self, value): self._assertNode() value = _utf8(value) c_text = _xcstr(value) tree.xmlNodeSetName(self._c_node, c_text) @cython.final @cython.internal cdef class _ModifyContentOnlyEntityProxy(_ModifyContentOnlyProxy): "A read-only proxy for entity references (for internal use only!)" property name: def __get__(self): return funicode(self._c_node.name) def __set__(self, value): value = _utf8(value) assert u'&' not in value and u';' not in value, \ f"Invalid entity name '{value}'" c_text = _xcstr(value) tree.xmlNodeSetName(self._c_node, c_text) @cython.final @cython.internal cdef class _AppendOnlyElementProxy(_ReadOnlyElementProxy): u"""A read-only element that allows adding children and changing the text content (i.e. everything that adds to the subtree). """ cpdef append(self, other_element): u"""Append a copy of an Element to the list of children. """ cdef xmlNode* c_next cdef xmlNode* c_node self._assertNode() c_node = _roNodeOf(other_element) c_node = _copyNodeToDoc(c_node, self._c_node.doc) c_next = c_node.next tree.xmlAddChild(self._c_node, c_node) _moveTail(c_next, c_node) def extend(self, elements): u"""Append a copy of all Elements from a sequence to the list of children. """ self._assertNode() for element in elements: self.append(element) property text: """Text before the first subelement. This is either a string or the value None, if there was no text. """ def __get__(self): self._assertNode() return _collectText(self._c_node.children) def __set__(self, value): self._assertNode() if isinstance(value, QName): value = _resolveQNameText(self, value).decode('utf8') _setNodeText(self._c_node, value) cdef _ReadOnlyProxy _newAppendOnlyProxy( _ReadOnlyProxy source_proxy, xmlNode* c_node): cdef _ReadOnlyProxy el if c_node.type == tree.XML_ELEMENT_NODE: el = _AppendOnlyElementProxy.__new__(_AppendOnlyElementProxy) elif c_node.type == tree.XML_PI_NODE: el = _ModifyContentOnlyPIProxy.__new__(_ModifyContentOnlyPIProxy) elif c_node.type == tree.XML_COMMENT_NODE: el = _ModifyContentOnlyProxy.__new__(_ModifyContentOnlyProxy) else: raise TypeError(f"Unsupported element type: {c_node.type}") el._c_node = c_node _initReadOnlyProxy(el, source_proxy) return el cdef xmlNode* _roNodeOf(element) except NULL: cdef xmlNode* c_node if isinstance(element, _Element): c_node = (<_Element>element)._c_node elif isinstance(element, _ReadOnlyProxy): c_node = (<_ReadOnlyProxy>element)._c_node elif isinstance(element, _OpaqueNodeWrapper): c_node = (<_OpaqueNodeWrapper>element)._c_node else: raise TypeError, f"invalid argument type {type(element)}" if c_node is NULL: raise TypeError, u"invalid element" return c_node cdef xmlNode* _nonRoNodeOf(element) except NULL: cdef xmlNode* c_node if isinstance(element, _Element): c_node = (<_Element>element)._c_node elif isinstance(element, _AppendOnlyElementProxy): c_node = (<_AppendOnlyElementProxy>element)._c_node elif isinstance(element, _OpaqueNodeWrapper): c_node = (<_OpaqueNodeWrapper>element)._c_node else: raise TypeError, f"invalid argument type {type(element)}" if c_node is NULL: raise TypeError, u"invalid element" return c_node

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