# Copyright (C) 2000-2018 Petr Dlouhy
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
HTML parser implemented using Beautiful Soup and html.parser.
"""

from warnings import filterwarnings

filterwarnings("ignore",
    message="The soupsieve package is not installed. CSS selectors cannot be used.",
    category=UserWarning, module="bs4")

from bs4 import BeautifulSoup, Tag


def make_soup(markup, from_encoding=None):
    return BeautifulSoup(markup, "html.parser", from_encoding=from_encoding,
                         multi_valued_attributes=None)

class Parser(object):
    handler = None

    def __init__(self, handler):
        self.handler = handler

    def feed_soup(self, soup):
        self.parse_contents(soup.contents)

    def parse_contents(self, contents):
        for content in contents:
            if isinstance(content, Tag):
                self.handler.start_element(
                    content.name, content.attrs, content.text.strip(),
                    content.sourceline,
                    None if content.sourcepos is None
                    else content.sourcepos + 1
                )
                if hasattr(content, 'contents'):  # recursion
                    self.parse_contents(content.contents)


def parser(handler=None):
    return Parser(handler)