- Create Economist SubmissionTracking package correctly: * mainArticle = full blog post content * coverLetter = 216-word SIR— letter * Links to blog post via blogPostId - Archive 'Letter to The Economist' from blog posts (it's the cover letter) - Fix date display on article cards (use published_at) - Target publication already displaying via blue badge Database changes: - Make blogPostId optional in SubmissionTracking model - Economist package ID: 68fa85ae49d4900e7f2ecd83 - Le Monde package ID: 68fa2abd2e6acd5691932150 Next: Enhanced modal with tabs, validation, export 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
717 lines
26 KiB
Python
717 lines
26 KiB
Python
"""Base and meta classes enabling declarative definition of custom element classes."""
|
|
|
|
from __future__ import annotations
|
|
|
|
import re
|
|
from typing import Any, Callable, Iterable, Protocol, Sequence, Type, cast
|
|
|
|
from lxml import etree
|
|
from lxml.etree import ElementBase, _Element # pyright: ignore[reportPrivateUsage]
|
|
|
|
from pptx.exc import InvalidXmlError
|
|
from pptx.oxml import oxml_parser
|
|
from pptx.oxml.ns import NamespacePrefixedTag, _nsmap, qn # pyright: ignore[reportPrivateUsage]
|
|
from pptx.util import lazyproperty
|
|
|
|
|
|
class AttributeType(Protocol):
|
|
"""Interface for an object that can act as an attribute type.
|
|
|
|
An attribute-type specifies how values are transformed to and from the XML "string" value of the
|
|
attribute.
|
|
"""
|
|
|
|
@classmethod
|
|
def from_xml(cls, xml_value: str) -> Any:
|
|
"""Transform an attribute value to a Python value."""
|
|
...
|
|
|
|
@classmethod
|
|
def to_xml(cls, value: Any) -> str:
|
|
"""Transform a Python value to a str value suitable to this XML attribute."""
|
|
...
|
|
|
|
|
|
def OxmlElement(nsptag_str: str, nsmap: dict[str, str] | None = None) -> BaseOxmlElement:
|
|
"""Return a "loose" lxml element having the tag specified by `nsptag_str`.
|
|
|
|
`nsptag_str` must contain the standard namespace prefix, e.g. 'a:tbl'. The resulting element is
|
|
an instance of the custom element class for this tag name if one is defined.
|
|
"""
|
|
nsptag = NamespacePrefixedTag(nsptag_str)
|
|
nsmap = nsmap if nsmap is not None else nsptag.nsmap
|
|
return oxml_parser.makeelement(nsptag.clark_name, nsmap=nsmap)
|
|
|
|
|
|
def serialize_for_reading(element: ElementBase):
|
|
"""
|
|
Serialize *element* to human-readable XML suitable for tests. No XML
|
|
declaration.
|
|
"""
|
|
xml = etree.tostring(element, encoding="unicode", pretty_print=True)
|
|
return XmlString(xml)
|
|
|
|
|
|
class XmlString(str):
|
|
"""Provides string comparison override suitable for serialized XML; useful for tests."""
|
|
|
|
# ' <w:xyz xmlns:a="http://ns/decl/a" attr_name="val">text</w:xyz>'
|
|
# | | || |
|
|
# +----------+------------------------------------------++-----------+
|
|
# front attrs | text
|
|
# close
|
|
|
|
_xml_elm_line_patt = re.compile(r"( *</?[\w:]+)(.*?)(/?>)([^<]*</[\w:]+>)?")
|
|
|
|
def __eq__(self, other: object) -> bool:
|
|
if not isinstance(other, str):
|
|
return False
|
|
lines = self.splitlines()
|
|
lines_other = other.splitlines()
|
|
if len(lines) != len(lines_other):
|
|
return False
|
|
for line, line_other in zip(lines, lines_other):
|
|
if not self._eq_elm_strs(line, line_other):
|
|
return False
|
|
return True
|
|
|
|
def __ne__(self, other: object) -> bool:
|
|
return not self.__eq__(other)
|
|
|
|
def _attr_seq(self, attrs: str) -> list[str]:
|
|
"""Return a sequence of attribute strings parsed from *attrs*.
|
|
|
|
Each attribute string is stripped of whitespace on both ends.
|
|
"""
|
|
attrs = attrs.strip()
|
|
attr_lst = attrs.split()
|
|
return sorted(attr_lst)
|
|
|
|
def _eq_elm_strs(self, line: str, line_2: str) -> bool:
|
|
"""True if the element in `line_2` is XML-equivalent to the element in `line`.
|
|
|
|
In particular, the order of attributes in XML is not significant.
|
|
"""
|
|
front, attrs, close, text = self._parse_line(line)
|
|
front_2, attrs_2, close_2, text_2 = self._parse_line(line_2)
|
|
if front != front_2:
|
|
return False
|
|
if self._attr_seq(attrs) != self._attr_seq(attrs_2):
|
|
return False
|
|
if close != close_2:
|
|
return False
|
|
if text != text_2:
|
|
return False
|
|
return True
|
|
|
|
def _parse_line(self, line: str):
|
|
"""Return front, attrs, close, text 4-tuple result of parsing XML element string `line`."""
|
|
match = self._xml_elm_line_patt.match(line)
|
|
if match is None:
|
|
raise ValueError("`line` does not match pattern for an XML element")
|
|
front, attrs, close, text = [match.group(n) for n in range(1, 5)]
|
|
return front, attrs, close, text
|
|
|
|
|
|
class MetaOxmlElement(type):
|
|
"""Metaclass for BaseOxmlElement."""
|
|
|
|
def __init__(cls, clsname: str, bases: tuple[type, ...], clsdict: dict[str, Any]):
|
|
dispatchable = (
|
|
OneAndOnlyOne,
|
|
OneOrMore,
|
|
OptionalAttribute,
|
|
RequiredAttribute,
|
|
ZeroOrMore,
|
|
ZeroOrOne,
|
|
ZeroOrOneChoice,
|
|
)
|
|
for key, value in clsdict.items():
|
|
if isinstance(value, dispatchable):
|
|
value.populate_class_members(cls, key)
|
|
|
|
|
|
class BaseAttribute:
|
|
"""Base class for OptionalAttribute and RequiredAttribute, providing common methods."""
|
|
|
|
def __init__(self, attr_name: str, simple_type: type[AttributeType]):
|
|
self._attr_name = attr_name
|
|
self._simple_type = simple_type
|
|
|
|
def populate_class_members(self, element_cls: Type[BaseOxmlElement], prop_name: str):
|
|
"""
|
|
Add the appropriate methods to *element_cls*.
|
|
"""
|
|
self._element_cls = element_cls
|
|
self._prop_name = prop_name
|
|
|
|
self._add_attr_property()
|
|
|
|
def _add_attr_property(self):
|
|
"""Add a read/write `{prop_name}` property to the element class.
|
|
|
|
The property returns the interpreted value of this attribute on access and changes the
|
|
attribute value to its ST_* counterpart on assignment.
|
|
"""
|
|
property_ = property(self._getter, self._setter, None)
|
|
# assign unconditionally to overwrite element name definition
|
|
setattr(self._element_cls, self._prop_name, property_)
|
|
|
|
@property
|
|
def _clark_name(self):
|
|
if ":" in self._attr_name:
|
|
return qn(self._attr_name)
|
|
return self._attr_name
|
|
|
|
@property
|
|
def _getter(self) -> Callable[[BaseOxmlElement], Any]:
|
|
"""Callable suitable for the "get" side of the attribute property descriptor."""
|
|
raise NotImplementedError("must be implemented by each subclass")
|
|
|
|
@property
|
|
def _setter(self) -> Callable[[BaseOxmlElement, Any], None]:
|
|
"""Callable suitable for the "set" side of the attribute property descriptor."""
|
|
raise NotImplementedError("must be implemented by each subclass")
|
|
|
|
|
|
class OptionalAttribute(BaseAttribute):
|
|
"""Defines an optional attribute on a custom element class.
|
|
|
|
An optional attribute returns a default value when not present for reading. When assigned
|
|
|None|, the attribute is removed.
|
|
"""
|
|
|
|
def __init__(self, attr_name: str, simple_type: type[AttributeType], default: Any = None):
|
|
super(OptionalAttribute, self).__init__(attr_name, simple_type)
|
|
self._default = default
|
|
|
|
@property
|
|
def _docstring(self):
|
|
"""
|
|
Return the string to use as the ``__doc__`` attribute of the property
|
|
for this attribute.
|
|
"""
|
|
return (
|
|
"%s type-converted value of ``%s`` attribute, or |None| (or spec"
|
|
"ified default value) if not present. Assigning the default valu"
|
|
"e causes the attribute to be removed from the element."
|
|
% (self._simple_type.__name__, self._attr_name)
|
|
)
|
|
|
|
@property
|
|
def _getter(self) -> Callable[[BaseOxmlElement], Any]:
|
|
"""Callable suitable for the "get" side of the attribute property descriptor."""
|
|
|
|
def get_attr_value(obj: BaseOxmlElement) -> Any:
|
|
attr_str_value = obj.get(self._clark_name)
|
|
if attr_str_value is None:
|
|
return self._default
|
|
return self._simple_type.from_xml(attr_str_value)
|
|
|
|
get_attr_value.__doc__ = self._docstring
|
|
return get_attr_value
|
|
|
|
@property
|
|
def _setter(self) -> Callable[[BaseOxmlElement, Any], None]:
|
|
"""Callable suitable for the "set" side of the attribute property descriptor."""
|
|
|
|
def set_attr_value(obj: BaseOxmlElement, value: Any) -> None:
|
|
# -- when an XML attribute has a default value, setting it to that default removes the
|
|
# -- attribute from the element (when it is present)
|
|
if value == self._default:
|
|
if self._clark_name in obj.attrib:
|
|
del obj.attrib[self._clark_name]
|
|
return
|
|
str_value = self._simple_type.to_xml(value)
|
|
obj.set(self._clark_name, str_value)
|
|
|
|
return set_attr_value
|
|
|
|
|
|
class RequiredAttribute(BaseAttribute):
|
|
"""Defines a required attribute on a custom element class.
|
|
|
|
A required attribute is assumed to be present for reading, so does not have a default value;
|
|
its actual value is always used. If missing on read, an |InvalidXmlError| is raised. It also
|
|
does not remove the attribute if |None| is assigned. Assigning |None| raises |TypeError| or
|
|
|ValueError|, depending on the simple type of the attribute.
|
|
"""
|
|
|
|
@property
|
|
def _getter(self) -> Callable[[BaseOxmlElement], Any]:
|
|
"""Callable suitable for the "get" side of the attribute property descriptor."""
|
|
|
|
def get_attr_value(obj: BaseOxmlElement) -> Any:
|
|
attr_str_value = obj.get(self._clark_name)
|
|
if attr_str_value is None:
|
|
raise InvalidXmlError(
|
|
"required '%s' attribute not present on element %s" % (self._attr_name, obj.tag)
|
|
)
|
|
return self._simple_type.from_xml(attr_str_value)
|
|
|
|
get_attr_value.__doc__ = self._docstring
|
|
return get_attr_value
|
|
|
|
@property
|
|
def _docstring(self):
|
|
"""
|
|
Return the string to use as the ``__doc__`` attribute of the property
|
|
for this attribute.
|
|
"""
|
|
return "%s type-converted value of ``%s`` attribute." % (
|
|
self._simple_type.__name__,
|
|
self._attr_name,
|
|
)
|
|
|
|
@property
|
|
def _setter(self) -> Callable[[BaseOxmlElement, Any], None]:
|
|
"""Callable suitable for the "set" side of the attribute property descriptor."""
|
|
|
|
def set_attr_value(obj: BaseOxmlElement, value: Any) -> None:
|
|
str_value = self._simple_type.to_xml(value)
|
|
obj.set(self._clark_name, str_value)
|
|
|
|
return set_attr_value
|
|
|
|
|
|
class _BaseChildElement:
|
|
"""Base class for the child element classes corresponding to varying cardinalities.
|
|
|
|
Subclasses include ZeroOrOne and ZeroOrMore.
|
|
"""
|
|
|
|
def __init__(self, nsptagname: str, successors: Sequence[str] = ()):
|
|
super(_BaseChildElement, self).__init__()
|
|
self._nsptagname = nsptagname
|
|
self._successors = successors
|
|
|
|
def populate_class_members(self, element_cls: Type[BaseOxmlElement], prop_name: str):
|
|
"""Baseline behavior for adding the appropriate methods to `element_cls`."""
|
|
self._element_cls = element_cls
|
|
self._prop_name = prop_name
|
|
|
|
def _add_adder(self):
|
|
"""Add an ``_add_x()`` method to the element class for this child element."""
|
|
|
|
def _add_child(obj: BaseOxmlElement, **attrs: Any):
|
|
new_method = getattr(obj, self._new_method_name)
|
|
child = new_method()
|
|
for key, value in attrs.items():
|
|
setattr(child, key, value)
|
|
insert_method = getattr(obj, self._insert_method_name)
|
|
insert_method(child)
|
|
return child
|
|
|
|
_add_child.__doc__ = (
|
|
"Add a new ``<%s>`` child element unconditionally, inserted in t"
|
|
"he correct sequence." % self._nsptagname
|
|
)
|
|
self._add_to_class(self._add_method_name, _add_child)
|
|
|
|
def _add_creator(self):
|
|
"""Add a `_new_{prop_name}()` method to the element class.
|
|
|
|
This method creates a new, empty element of the correct type, having no attributes.
|
|
"""
|
|
creator = self._creator
|
|
creator.__doc__ = (
|
|
'Return a "loose", newly created ``<%s>`` element having no attri'
|
|
"butes, text, or children." % self._nsptagname
|
|
)
|
|
self._add_to_class(self._new_method_name, creator)
|
|
|
|
def _add_getter(self):
|
|
"""Add a read-only `{prop_name}` property to the parent element class.
|
|
|
|
The property locates and returns this child element or `None` if not present.
|
|
"""
|
|
property_ = property(self._getter, None, None)
|
|
# assign unconditionally to overwrite element name definition
|
|
setattr(self._element_cls, self._prop_name, property_)
|
|
|
|
def _add_inserter(self):
|
|
"""Add an ``_insert_x()`` method to the element class for this child element."""
|
|
|
|
def _insert_child(obj: BaseOxmlElement, child: BaseOxmlElement):
|
|
obj.insert_element_before(child, *self._successors)
|
|
return child
|
|
|
|
_insert_child.__doc__ = (
|
|
"Return the passed ``<%s>`` element after inserting it as a chil"
|
|
"d in the correct sequence." % self._nsptagname
|
|
)
|
|
self._add_to_class(self._insert_method_name, _insert_child)
|
|
|
|
def _add_list_getter(self):
|
|
"""
|
|
Add a read-only ``{prop_name}_lst`` property to the element class to
|
|
retrieve a list of child elements matching this type.
|
|
"""
|
|
prop_name = f"{self._prop_name}_lst"
|
|
property_ = property(self._list_getter, None, None)
|
|
setattr(self._element_cls, prop_name, property_)
|
|
|
|
@lazyproperty
|
|
def _add_method_name(self):
|
|
return "_add_%s" % self._prop_name
|
|
|
|
def _add_to_class(self, name: str, method: Callable[..., Any]):
|
|
"""Add `method` to the target class as `name`, unless `name` is already defined there."""
|
|
if hasattr(self._element_cls, name):
|
|
return
|
|
setattr(self._element_cls, name, method)
|
|
|
|
@property
|
|
def _creator(self) -> Callable[[BaseOxmlElement], BaseOxmlElement]:
|
|
"""Callable that creates a new, empty element of the child type, having no attributes."""
|
|
|
|
def new_child_element(obj: BaseOxmlElement):
|
|
return OxmlElement(self._nsptagname)
|
|
|
|
return new_child_element
|
|
|
|
@property
|
|
def _getter(self) -> Callable[[BaseOxmlElement], BaseOxmlElement | None]:
|
|
"""Callable suitable for the "get" side of the property descriptor.
|
|
|
|
This default getter returns the child element with matching tag name or |None| if not
|
|
present.
|
|
"""
|
|
|
|
def get_child_element(obj: BaseOxmlElement) -> BaseOxmlElement | None:
|
|
return obj.find(qn(self._nsptagname))
|
|
|
|
get_child_element.__doc__ = (
|
|
"``<%s>`` child element or |None| if not present." % self._nsptagname
|
|
)
|
|
return get_child_element
|
|
|
|
@lazyproperty
|
|
def _insert_method_name(self):
|
|
return "_insert_%s" % self._prop_name
|
|
|
|
@property
|
|
def _list_getter(self) -> Callable[[BaseOxmlElement], list[BaseOxmlElement]]:
|
|
"""Callable suitable for the "get" side of a list property descriptor."""
|
|
|
|
def get_child_element_list(obj: BaseOxmlElement) -> list[BaseOxmlElement]:
|
|
return cast("list[BaseOxmlElement]", obj.findall(qn(self._nsptagname)))
|
|
|
|
get_child_element_list.__doc__ = (
|
|
"A list containing each of the ``<%s>`` child elements, in the o"
|
|
"rder they appear." % self._nsptagname
|
|
)
|
|
return get_child_element_list
|
|
|
|
@lazyproperty
|
|
def _remove_method_name(self):
|
|
return "_remove_%s" % self._prop_name
|
|
|
|
@lazyproperty
|
|
def _new_method_name(self):
|
|
return "_new_%s" % self._prop_name
|
|
|
|
|
|
class Choice(_BaseChildElement):
|
|
"""Defines a child element belonging to a group, only one of which may appear as a child."""
|
|
|
|
@property
|
|
def nsptagname(self):
|
|
return self._nsptagname
|
|
|
|
def populate_class_members( # pyright: ignore[reportIncompatibleMethodOverride]
|
|
self, element_cls: Type[BaseOxmlElement], group_prop_name: str, successors: Sequence[str]
|
|
):
|
|
"""Add the appropriate methods to `element_cls`."""
|
|
self._element_cls = element_cls
|
|
self._group_prop_name = group_prop_name
|
|
self._successors = successors
|
|
|
|
self._add_getter()
|
|
self._add_creator()
|
|
self._add_inserter()
|
|
self._add_adder()
|
|
self._add_get_or_change_to_method()
|
|
|
|
def _add_get_or_change_to_method(self) -> None:
|
|
"""Add a `get_or_change_to_x()` method to the element class for this child element."""
|
|
|
|
def get_or_change_to_child(obj: BaseOxmlElement):
|
|
child = getattr(obj, self._prop_name)
|
|
if child is not None:
|
|
return child
|
|
remove_group_method = getattr(obj, self._remove_group_method_name)
|
|
remove_group_method()
|
|
add_method = getattr(obj, self._add_method_name)
|
|
child = add_method()
|
|
return child
|
|
|
|
get_or_change_to_child.__doc__ = (
|
|
"Return the ``<%s>`` child, replacing any other group element if" " found."
|
|
) % self._nsptagname
|
|
self._add_to_class(self._get_or_change_to_method_name, get_or_change_to_child)
|
|
|
|
@property
|
|
def _prop_name(self):
|
|
"""
|
|
Calculate property name from tag name, e.g. a:schemeClr -> schemeClr.
|
|
"""
|
|
if ":" in self._nsptagname:
|
|
start = self._nsptagname.index(":") + 1
|
|
else:
|
|
start = 0
|
|
return self._nsptagname[start:]
|
|
|
|
@lazyproperty
|
|
def _get_or_change_to_method_name(self):
|
|
return "get_or_change_to_%s" % self._prop_name
|
|
|
|
@lazyproperty
|
|
def _remove_group_method_name(self):
|
|
return "_remove_%s" % self._group_prop_name
|
|
|
|
|
|
class OneAndOnlyOne(_BaseChildElement):
|
|
"""Defines a required child element for MetaOxmlElement."""
|
|
|
|
def __init__(self, nsptagname: str):
|
|
super(OneAndOnlyOne, self).__init__(nsptagname, ())
|
|
|
|
def populate_class_members(self, element_cls: Type[BaseOxmlElement], prop_name: str):
|
|
"""
|
|
Add the appropriate methods to *element_cls*.
|
|
"""
|
|
super(OneAndOnlyOne, self).populate_class_members(element_cls, prop_name)
|
|
self._add_getter()
|
|
|
|
@property
|
|
def _getter(self) -> Callable[[BaseOxmlElement], BaseOxmlElement]:
|
|
"""Callable suitable for the "get" side of the property descriptor."""
|
|
|
|
def get_child_element(obj: BaseOxmlElement) -> BaseOxmlElement:
|
|
child = obj.find(qn(self._nsptagname))
|
|
if child is None:
|
|
raise InvalidXmlError(
|
|
"required ``<%s>`` child element not present" % self._nsptagname
|
|
)
|
|
return child
|
|
|
|
get_child_element.__doc__ = "Required ``<%s>`` child element." % self._nsptagname
|
|
return get_child_element
|
|
|
|
|
|
class OneOrMore(_BaseChildElement):
|
|
"""Defines a repeating child element for MetaOxmlElement that must appear at least once."""
|
|
|
|
def populate_class_members(self, element_cls: Type[BaseOxmlElement], prop_name: str):
|
|
"""Add the appropriate methods to *element_cls*."""
|
|
super(OneOrMore, self).populate_class_members(element_cls, prop_name)
|
|
self._add_list_getter()
|
|
self._add_creator()
|
|
self._add_inserter()
|
|
self._add_adder()
|
|
self._add_public_adder()
|
|
delattr(element_cls, prop_name)
|
|
|
|
def _add_public_adder(self) -> None:
|
|
"""Add a public `.add_x()` method to the parent element class."""
|
|
|
|
def add_child(obj: BaseOxmlElement) -> BaseOxmlElement:
|
|
private_add_method = getattr(obj, self._add_method_name)
|
|
child = private_add_method()
|
|
return child
|
|
|
|
add_child.__doc__ = (
|
|
"Add a new ``<%s>`` child element unconditionally, inserted in t"
|
|
"he correct sequence." % self._nsptagname
|
|
)
|
|
self._add_to_class(self._public_add_method_name, add_child)
|
|
|
|
@lazyproperty
|
|
def _public_add_method_name(self):
|
|
"""
|
|
add_childElement() is public API for a repeating element, allowing
|
|
new elements to be added to the sequence. May be overridden to
|
|
provide a friendlier API to clients having domain appropriate
|
|
parameter names for required attributes.
|
|
"""
|
|
return "add_%s" % self._prop_name
|
|
|
|
|
|
class ZeroOrMore(_BaseChildElement):
|
|
"""
|
|
Defines an optional repeating child element for MetaOxmlElement.
|
|
"""
|
|
|
|
def populate_class_members(self, element_cls: Type[BaseOxmlElement], prop_name: str):
|
|
"""
|
|
Add the appropriate methods to *element_cls*.
|
|
"""
|
|
super(ZeroOrMore, self).populate_class_members(element_cls, prop_name)
|
|
self._add_list_getter()
|
|
self._add_creator()
|
|
self._add_inserter()
|
|
self._add_adder()
|
|
delattr(element_cls, prop_name)
|
|
|
|
|
|
class ZeroOrOne(_BaseChildElement):
|
|
"""Defines an optional child element for MetaOxmlElement."""
|
|
|
|
def populate_class_members(self, element_cls: Type[BaseOxmlElement], prop_name: str):
|
|
"""Add the appropriate methods to `element_cls`."""
|
|
super(ZeroOrOne, self).populate_class_members(element_cls, prop_name)
|
|
self._add_getter()
|
|
self._add_creator()
|
|
self._add_inserter()
|
|
self._add_adder()
|
|
self._add_get_or_adder()
|
|
self._add_remover()
|
|
|
|
def _add_get_or_adder(self):
|
|
"""Add a `.get_or_add_x()` method to the element class for this child element."""
|
|
|
|
def get_or_add_child(obj: BaseOxmlElement) -> BaseOxmlElement:
|
|
child = getattr(obj, self._prop_name)
|
|
if child is None:
|
|
add_method = getattr(obj, self._add_method_name)
|
|
child = add_method()
|
|
return child
|
|
|
|
get_or_add_child.__doc__ = (
|
|
"Return the ``<%s>`` child element, newly added if not present."
|
|
) % self._nsptagname
|
|
self._add_to_class(self._get_or_add_method_name, get_or_add_child)
|
|
|
|
def _add_remover(self):
|
|
"""Add a `._remove_x()` method to the element class for this child element."""
|
|
|
|
def _remove_child(obj: BaseOxmlElement) -> None:
|
|
obj.remove_all(self._nsptagname)
|
|
|
|
_remove_child.__doc__ = f"Remove all `{self._nsptagname}` child elements."
|
|
self._add_to_class(self._remove_method_name, _remove_child)
|
|
|
|
@lazyproperty
|
|
def _get_or_add_method_name(self):
|
|
return "get_or_add_%s" % self._prop_name
|
|
|
|
|
|
class ZeroOrOneChoice(_BaseChildElement):
|
|
"""An `EG_*` element group where at most one of its members may appear as a child."""
|
|
|
|
def __init__(self, choices: Iterable[Choice], successors: Iterable[str] = ()):
|
|
self._choices = tuple(choices)
|
|
self._successors = tuple(successors)
|
|
|
|
def populate_class_members(self, element_cls: Type[BaseOxmlElement], prop_name: str):
|
|
"""Add the appropriate methods to `element_cls`."""
|
|
super(ZeroOrOneChoice, self).populate_class_members(element_cls, prop_name)
|
|
self._add_choice_getter()
|
|
for choice in self._choices:
|
|
choice.populate_class_members(element_cls, self._prop_name, self._successors)
|
|
self._add_group_remover()
|
|
|
|
def _add_choice_getter(self):
|
|
"""Add a read-only `.{prop_name}` property to the element class.
|
|
|
|
The property returns the present member of this group, or |None| if none are present.
|
|
"""
|
|
property_ = property(self._choice_getter, None, None)
|
|
# assign unconditionally to overwrite element name definition
|
|
setattr(self._element_cls, self._prop_name, property_)
|
|
|
|
def _add_group_remover(self):
|
|
"""Add a `._remove_eg_x()` method to the element class for this choice group."""
|
|
|
|
def _remove_choice_group(obj: BaseOxmlElement) -> None:
|
|
for tagname in self._member_nsptagnames:
|
|
obj.remove_all(tagname)
|
|
|
|
_remove_choice_group.__doc__ = "Remove the current choice group child element if present."
|
|
self._add_to_class(self._remove_choice_group_method_name, _remove_choice_group)
|
|
|
|
@property
|
|
def _choice_getter(self):
|
|
"""
|
|
Return a function object suitable for the "get" side of the property
|
|
descriptor.
|
|
"""
|
|
|
|
def get_group_member_element(obj: BaseOxmlElement) -> BaseOxmlElement | None:
|
|
return cast(
|
|
"BaseOxmlElement | None", obj.first_child_found_in(*self._member_nsptagnames)
|
|
)
|
|
|
|
get_group_member_element.__doc__ = (
|
|
"Return the child element belonging to this element group, or "
|
|
"|None| if no member child is present."
|
|
)
|
|
return get_group_member_element
|
|
|
|
@lazyproperty
|
|
def _member_nsptagnames(self) -> list[str]:
|
|
"""Sequence of namespace-prefixed tagnames, one for each member element of choice group."""
|
|
return [choice.nsptagname for choice in self._choices]
|
|
|
|
@lazyproperty
|
|
def _remove_choice_group_method_name(self):
|
|
"""Function-name for choice remover."""
|
|
return f"_remove_{self._prop_name}"
|
|
|
|
|
|
# -- lxml typing isn't quite right here, just ignore this error on _Element --
|
|
class BaseOxmlElement(etree.ElementBase, metaclass=MetaOxmlElement):
|
|
"""Effective base class for all custom element classes.
|
|
|
|
Adds standardized behavior to all classes in one place.
|
|
"""
|
|
|
|
def __repr__(self):
|
|
return "<%s '<%s>' at 0x%0x>" % (
|
|
self.__class__.__name__,
|
|
self._nsptag,
|
|
id(self),
|
|
)
|
|
|
|
def first_child_found_in(self, *tagnames: str) -> _Element | None:
|
|
"""First child with tag in `tagnames`, or None if not found."""
|
|
for tagname in tagnames:
|
|
child = self.find(qn(tagname))
|
|
if child is not None:
|
|
return child
|
|
return None
|
|
|
|
def insert_element_before(self, elm: ElementBase, *tagnames: str):
|
|
successor = self.first_child_found_in(*tagnames)
|
|
if successor is not None:
|
|
successor.addprevious(elm)
|
|
else:
|
|
self.append(elm)
|
|
return elm
|
|
|
|
def remove_all(self, *tagnames: str) -> None:
|
|
"""Remove child elements with tagname (e.g. "a:p") in `tagnames`."""
|
|
for tagname in tagnames:
|
|
matching = self.findall(qn(tagname))
|
|
for child in matching:
|
|
self.remove(child)
|
|
|
|
@property
|
|
def xml(self) -> str:
|
|
"""XML string for this element, suitable for testing purposes.
|
|
|
|
Pretty printed for readability and without an XML declaration at the top.
|
|
"""
|
|
return serialize_for_reading(self)
|
|
|
|
def xpath(self, xpath_str: str) -> Any: # pyright: ignore[reportIncompatibleMethodOverride]
|
|
"""Override of `lxml` _Element.xpath() method.
|
|
|
|
Provides standard Open XML namespace mapping (`nsmap`) in centralized location.
|
|
"""
|
|
return super().xpath(xpath_str, namespaces=_nsmap)
|
|
|
|
@property
|
|
def _nsptag(self) -> str:
|
|
return NamespacePrefixedTag.from_clark_name(self.tag)
|