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File Name : 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 "" % 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

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2026-03-03 09:04:35
..	dir	-	root/root	0755	2026-03-03 09:06:27
__pycache__	dir	-	root/root	0755	2026-03-03 09:04:35
html	dir	-	root/root	0755	2026-03-03 09:04:35
includes	dir	-	root/root	0755	2026-03-03 09:04:35
isoschematron	dir	-	root/root	0755	2026-03-03 09:04:35
ElementInclude.py	text/x-script.python	8.36 KB	root/root	0644	2026-02-13 12:40:39
__init__.py	text/x-script.python	575 B	root/root	0644	2026-02-13 12:40:39
_elementpath.cpython-311-x86_64-linux-gnu.so	application/x-pie-executable	225.27 KB	root/root	0755	2026-02-13 12:41:00
_elementpath.py	text/x-script.python	10.49 KB	root/root	0644	2026-02-13 12:40:39
apihelpers.pxi	text/x-script.python	62.94 KB	root/root	0644	2026-02-13 12:40:39
builder.cpython-311-x86_64-linux-gnu.so	application/x-pie-executable	120.73 KB	root/root	0755	2026-02-13 12:41:00
builder.py	text/x-script.python	7.96 KB	root/root	0644	2026-02-13 12:40:39
classlookup.pxi	text/x-script.python	21.94 KB	root/root	0644	2026-02-13 12:40:39
cleanup.pxi	text/x-script.python	8.26 KB	root/root	0644	2026-02-13 12:40:39
cssselect.py	text/plain	3.29 KB	root/root	0644	2026-02-13 12:40:39
debug.pxi	text/x-script.python	3.21 KB	root/root	0644	2026-02-13 12:40:39
docloader.pxi	text/x-script.python	5.65 KB	root/root	0644	2026-02-13 12:40:39
doctestcompare.py	text/plain	17.91 KB	root/root	0644	2026-02-13 12:40:39
dtd.pxi	text/x-script.python	14.86 KB	root/root	0644	2026-02-13 12:40:39
etree.cpython-311-x86_64-linux-gnu.so	application/x-pie-executable	5.53 MB	root/root	0755	2026-02-13 12:41:00
etree.h	text/x-c	8.37 KB	root/root	0644	2026-02-13 12:40:39
etree.pyx	text/x-script.python	129.31 KB	root/root	0644	2026-02-13 12:40:39
etree_api.h	text/x-c	17.06 KB	root/root	0644	2026-02-13 12:40:39
extensions.pxi	text/x-script.python	32.46 KB	root/root	0644	2026-02-13 12:40:39
iterparse.pxi	text/x-script.python	16.22 KB	root/root	0644	2026-02-13 12:40:39
lxml.etree.h	text/x-c	8.37 KB	root/root	0644	2026-02-13 12:40:39
lxml.etree_api.h	text/x-c	17.06 KB	root/root	0644	2026-02-13 12:40:39
nsclasses.pxi	text/x-script.python	8.93 KB	root/root	0644	2026-02-13 12:40:39
objectify.cpython-311-x86_64-linux-gnu.so	application/x-pie-executable	3.2 MB	root/root	0755	2026-02-13 12:41:00
objectify.pyx	text/x-script.python	75.29 KB	root/root	0644	2026-02-13 12:40:39
objectpath.pxi	text/x-script.python	11.21 KB	root/root	0644	2026-02-13 12:40:39
parser.pxi	text/x-script.python	76.41 KB	root/root	0644	2026-02-13 12:40:39
parsertarget.pxi	text/x-script.python	6.7 KB	root/root	0644	2026-02-13 12:40:39
proxy.pxi	text/plain	23.01 KB	root/root	0644	2026-02-13 12:40:39
public-api.pxi	text/plain	6.5 KB	root/root	0644	2026-02-13 12:40:39
pyclasslookup.py	text/x-script.python	92 B	root/root	0644	2026-02-13 12:40:39
readonlytree.pxi	text/x-script.python	18.6 KB	root/root	0644	2026-02-13 12:40:39
relaxng.pxi	text/x-script.python	5.94 KB	root/root	0644	2026-02-13 12:40:39
sax.cpython-311-x86_64-linux-gnu.so	application/x-pie-executable	196.95 KB	root/root	0755	2026-02-13 12:41:00
sax.py	text/x-script.python	9.18 KB	root/root	0644	2026-02-13 12:40:39
saxparser.pxi	text/x-script.python	31.78 KB	root/root	0644	2026-02-13 12:40:39
schematron.pxi	text/x-script.python	5.65 KB	root/root	0644	2026-02-13 12:40:39
serializer.pxi	text/x-script.python	66.41 KB	root/root	0644	2026-02-13 12:40:39
usedoctest.py	text/plain	230 B	root/root	0644	2026-02-13 12:40:39
xinclude.pxi	text/x-script.python	2.4 KB	root/root	0644	2026-02-13 12:40:39
xmlerror.pxi	text/x-script.python	48.37 KB	root/root	0644	2026-02-13 12:40:39
xmlid.pxi	text/x-script.python	5.92 KB	root/root	0644	2026-02-13 12:40:39
xmlschema.pxi	text/x-script.python	7.89 KB	root/root	0644	2026-02-13 12:40:39
xpath.pxi	text/x-script.python	19.11 KB	root/root	0644	2026-02-13 12:40:39
xslt.pxi	text/x-script.python	35.83 KB	root/root	0644	2026-02-13 12:40:39
xsltext.pxi	text/x-script.python	10.83 KB	root/root	0644	2026-02-13 12:40:39

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