mirror of
https://github.com/Hopiu/linkchecker.git
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134 lines
4.8 KiB
Python
134 lines
4.8 KiB
Python
# Copyright (C) 2000-2018 Petr Dlouhy
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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"""
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HTML parser implemented using Beautiful Soup and html.parser.
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"""
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from io import BytesIO, StringIO
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from warnings import filterwarnings
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filterwarnings("ignore",
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message="The soupsieve package is not installed. CSS selectors cannot be used.",
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category=UserWarning, module="bs4")
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from bs4 import (BeautifulSoup, CData, Comment, Doctype, ProcessingInstruction,
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Tag)
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from ..containers import ListDict
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class Parser(object):
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handler = None
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encoding = None
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def __init__(self, handler):
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self.handler = handler
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self.reset()
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def feed(self, feed_text):
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if not self.html_doc:
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if isinstance(feed_text, bytes):
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self.html_doc = BytesIO()
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else:
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self.html_doc = StringIO()
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self.html_doc.write(feed_text)
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def feed_soup(self, soup):
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self.soup = soup
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def reset(self):
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self.soup = None
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self.html_doc = None
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self.tag_lineno = None
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self.tag_column = None
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self.last_tag_lineno = None
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self.last_tag_column = None
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def parse_contents(self, contents):
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for content in contents:
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if isinstance(content, Tag):
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attrs = ListDict()
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for k, v_list in sorted(content.attrs.items()):
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if not isinstance(v_list, list):
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v_list = [v_list]
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for v in v_list:
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# empty parameters returned by BS4
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# are sometimes in bytes:
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if v == b'':
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v = u''
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attrs[k] = v
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self.last_tag_lineno = self.tag_lineno
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self.last_tag_column = self.tag_column
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self.tag_lineno = content.sourceline
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self.tag_column = None if content.sourcepos is None \
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else content.sourcepos + 1
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if content.is_empty_element:
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self.handler.start_end_element(
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content.name, attrs, content.text.strip(),
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)
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else:
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self.handler.start_element(
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content.name, attrs, content.text.strip(),
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)
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if hasattr(content, 'contents'): # recursion
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self.parse_contents(content.contents)
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if hasattr(self.handler, 'end_element'):
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self.handler.end_element(content.name)
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if content.comments:
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for comment in content.comments:
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if hasattr(self.handler, 'comment'):
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self.handler.comment(comment)
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elif isinstance(content, Doctype):
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if hasattr(self.handler, 'doctype'):
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self.handler.doctype(content[7:])
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elif isinstance(content, Comment):
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if hasattr(self.handler, 'comment'):
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self.handler.comment(content.strip())
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elif isinstance(content, CData):
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if hasattr(self.handler, 'cdata'):
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self.handler.cdata(content)
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elif isinstance(content, ProcessingInstruction):
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if hasattr(self.handler, 'pi'):
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self.handler.pi(content.strip("? "))
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else:
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if hasattr(self.handler, 'characters'):
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self.handler.characters(content)
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def flush(self):
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if self.soup is None:
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self.soup = BeautifulSoup(self.html_doc.getvalue(), 'html.parser')
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if hasattr(self.soup, 'contents'):
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self.parse_contents(self.soup.contents)
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self.encoding = self.soup.original_encoding
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def debug(self, text):
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raise NotImplementedError("debug is not implemented")
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def lineno(self):
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return self.tag_lineno
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def last_lineno(self):
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return self.last_tag_lineno
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def column(self):
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return self.tag_column
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def last_column(self):
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return self.last_tag_column
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def parser(handler=None):
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return Parser(handler)
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