from html.parser import HTMLParser

class DivTracker(HTMLParser):
    def __init__(self):
        super().__init__()
        self.stack = []
        self.found_tab_backtest = False
        
    def handle_starttag(self, tag, attrs):
        if tag == 'div':
            attrs_dict = dict(attrs)
            if attrs_dict.get('id') == 'tab-backtest':
                self.found_tab_backtest = True
            
            if self.found_tab_backtest:
                self.stack.append(self.getpos())
                
    def handle_endtag(self, tag):
        if tag == 'div' and self.found_tab_backtest:
            if self.stack:
                self.stack.pop()

with open('templates/backtest.html', 'r', encoding='utf-8') as f:
    html = f.read()
    
# Only process up to tab-backtest end
end_idx = html.find('tab-backtest end')
if end_idx != -1:
    # include the </div> before it
    end_div_idx = html.rfind('</div>', 0, end_idx)
    html = html[:end_div_idx+6]
    
tracker = DivTracker()
tracker.feed(html)
print("Unclosed div start positions inside tab-backtest:")
for pos in tracker.stack:
    print(pos)