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# xml_reader.py
#
# Copyright 2021 James Westman <james@jwestman.net>
#
# This file is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 3 of the
# License, or (at your option) any later version.
#
# This file is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# SPDX-License-Identifier: LGPL-3.0-or-later
import typing as T
from collections import defaultdict
from functools import cached_property
from xml import sax
# To speed up parsing, we ignore all tags except these
PARSE_GIR = set(
[
"repository",
"namespace",
"class",
"interface",
"property",
"glib:signal",
"include",
"implements",
"type",
"parameter",
"parameters",
"enumeration",
"member",
"bitfield",
]
)
class Element:
def __init__(self, tag: str, attrs: T.Dict[str, str]):
self.tag = tag
self.attrs = attrs
self.children: T.List["Element"] = []
self.cdata_chunks: T.List[str] = []
@cached_property
def cdata(self):
return "".join(self.cdata_chunks)
def get_elements(self, name: str) -> T.List["Element"]:
return [child for child in self.children if child.tag == name]
def __getitem__(self, key: str):
return self.attrs.get(key)
class Handler(sax.handler.ContentHandler):
def __init__(self):
self.root = None
self.stack = []
def startElement(self, name, attrs):
element = Element(name, attrs.copy())
if len(self.stack):
last = self.stack[-1]
last.children.append(element)
else:
self.root = element
self.stack.append(element)
def endElement(self, name):
self.stack.pop()
def characters(self, content):
self.stack[-1].cdata_chunks.append(content)
def parse(filename):
parser = sax.make_parser()
handler = Handler()
parser.setContentHandler(handler)
parser.parse(filename)
return handler.root
def parse_string(xml):
handler = Handler()
parser = sax.parseString(xml, handler)
return handler.root
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