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93 lines
2.6 KiB
Python
93 lines
2.6 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 xml import sax
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from .utils import lazy_prop
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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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"repository", "namespace", "class", "interface", "property", "glib:signal",
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"include", "implements", "type", "parameter", "parameters", "enumeration",
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"member",
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])
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class Element:
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def __init__(self, tag, attrs):
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self.tag = tag
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self.attrs = attrs
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self.children = defaultdict(list)
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self.cdata_chunks = []
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@lazy_prop
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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):
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return self.children.get(name, [])
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def __getitem__(self, key):
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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, parse_type):
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self.root = None
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self.stack = []
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self.skipping = 0
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self._interesting_elements = parse_type
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def startElement(self, name, attrs):
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if name not in self._interesting_elements:
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self.skipping += 1
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if self.skipping > 0:
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return
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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[name].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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if self.skipping == 0:
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self.stack.pop()
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if name not in self._interesting_elements:
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self.skipping -= 1
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def characters(self, content):
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if not self.skipping:
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self.stack[-1].cdata_chunks.append(content)
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def parse(filename, parse_type):
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parser = sax.make_parser()
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handler = Handler(parse_type)
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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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