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# This module builds XML trees but does not parse them, so it does not need
# defusedxml
import xml.etree.ElementTree as ET
from contextlib import contextmanager
try:
import lxml.etree
HAVE_LXML = True
except ModuleNotFoundError:
HAVE_LXML = False
class Builder:
def __init__(self, etreebuilder=None):
if etreebuilder is None:
etreebuilder = ET.TreeBuilder()
self.etreebuilder = etreebuilder
self.default_namespace = None
def _decorate_tag_name(self, tag: str):
if self.default_namespace is not None and not tag.startswith("{"):
return "{" + self.default_namespace + "}" + tag
return tag
def add(self, tag: str, value: str, **attrs):
tag = self._decorate_tag_name(tag)
self.etreebuilder.start(tag, attrs)
if value is not None:
self.etreebuilder.data(value)
self.etreebuilder.end(tag)
@contextmanager
def element(self, tag: str, **attrs):
tag = self._decorate_tag_name(tag)
self.etreebuilder.start(tag, attrs)
yield self
self.etreebuilder.end(tag)
@contextmanager
def override_default_namespace(self, ns):
b = Builder(self.etreebuilder)
b.default_namespace = ns
yield b
def get_tree(self):
root = self.etreebuilder.close()
return ET.ElementTree(root)
if HAVE_LXML:
class LXMLBuilder:
def __init__(self, etreebuilder=None):
if etreebuilder is None:
etreebuilder = lxml.etree.TreeBuilder()
self.etreebuilder = etreebuilder
self.default_namespace = None
def _decorate_tag_name(self, tag: str):
if self.default_namespace is not None and not tag.startswith("{"):
return "{" + self.default_namespace + "}" + tag
return tag
def add(self, tag: str, value: str, **attrs):
tag = self._decorate_tag_name(tag)
self.etreebuilder.start(tag, attrs)
if value is not None:
self.etreebuilder.data(value)
self.etreebuilder.end(tag)
@contextmanager
def element(self, tag: str, **attrs):
tag = self._decorate_tag_name(tag)
self.etreebuilder.start(tag, attrs)
yield self
self.etreebuilder.end(tag)
@contextmanager
def override_default_namespace(self, ns):
b = Builder(self.etreebuilder)
b.default_namespace = ns
yield b
def get_tree(self):
root = self.etreebuilder.close()
return lxml.etree.ElementTree(root)
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