Created
September 10, 2012 15:13
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python:htmlparser
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| #!/usr/bin/env python | |
| # -*- coding: utf-8 -*- | |
| import html.parser | |
| class ContentParser(html.parser.HTMLParser): | |
| def __init__(self, begin_tag, stop_tag): | |
| html.parser.HTMLParser.__init__(self) | |
| tag_temple = ('type', 'name', 'attrs', 'contains_me') | |
| self.begin_tag = dict(zip(tag_temple, begin_tag)) | |
| self.begin_tag.setdefault('contains_me', False) | |
| self.stop_tag = dict(zip(tag_temple, stop_tag)) | |
| self.stop_tag.setdefault('contains_me', False) | |
| def reset(self): | |
| html.parser.HTMLParser.reset(self) | |
| self.switch_flag = False | |
| self.content = [''] | |
| def begin_now(self): | |
| self.switch_flag = True | |
| return | |
| def stop_now(self): | |
| self.switch_flag = False | |
| return | |
| @staticmethod | |
| def tag_process(tag_type, target_tag, target_action, tag, attrs): | |
| def has_attr(match_attrs, source_attrs): | |
| match_dict = dict(match_attrs) | |
| source_dict = dict(source_attrs) | |
| if 'class' in match_dict: | |
| if 'class' in source_dict: | |
| if set(str.split(match_dict.pop('class'))).issubset(set(str.split(source_dict.pop('class')))): | |
| pass | |
| else: | |
| return False | |
| else: | |
| return False | |
| return set(match_dict.items()).issubset(set(source_dict.items())) | |
| if target_tag['type'] == tag_type: | |
| if tag == target_tag['name']: | |
| if target_tag['attrs'] is None or len(target_tag['attrs']) == 0 or tag_type == 'endtag': | |
| target_action() | |
| return True | |
| else: | |
| if len(target_tag['attrs']) > len(attrs): | |
| return False | |
| else: | |
| if has_attr(target_tag['attrs'], attrs): | |
| target_action() | |
| return True | |
| else: | |
| return False | |
| else: | |
| return False | |
| else: | |
| return False | |
| def pre_tag_process(self, tag_type, tag, attrs = None): | |
| def get_tag_text(): | |
| if tag_type == 'endtag': | |
| return '</{0}>'.format(tag) | |
| else: | |
| return self.get_starttag_text() | |
| if self.switch_flag == False: | |
| if self.tag_process(tag_type, self.begin_tag, self.begin_now, tag, attrs) == True: | |
| if self.begin_tag['contains_me'] == False: | |
| self.content = [] | |
| else: | |
| self.content = [get_tag_text()] | |
| return True | |
| else: | |
| return False | |
| else: | |
| if self.tag_process(tag_type, self.stop_tag, self.stop_now, tag, attrs) == True: | |
| if self.stop_tag['contains_me'] == False: | |
| return False | |
| else: | |
| self.content.append(get_tag_text()) | |
| return True | |
| else: | |
| self.content.append(get_tag_text()) | |
| return True | |
| def handle_starttag(self, tag, attrs): | |
| self.pre_tag_process('starttag', tag, attrs) | |
| def handle_endtag(self, tag): | |
| self.pre_tag_process('endtag', tag) | |
| def handle_startendtag(self, tag, attrs): | |
| self.pre_tag_process('startendtag', tag, attrs) | |
| def handle_data(self, data): | |
| if self.switch_flag == False: | |
| return False | |
| else: | |
| self.content.append(data) | |
| return True | |
| def main(): | |
| page = '<html><h1 id="q" class="a c b">Title</h1><p>Im a paragraph!</p><p>Another paragraph</p></html>' | |
| myparser = ContentParser(['starttag', 'h1', [('class','a b'), ('id', 'q')], True], ['endtag', 'p', None, True]) | |
| myparser.feed(page) | |
| print(''.join(myparser.content)) | |
| myparser.reset() | |
| print(myparser.content) | |
| if __name__ == '__main__': | |
| main() |
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