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