templates.py 文件源码

def parse_if(self, args):
        cond = self.parse_python('if %s: pass' % args).nodes[0]
        tag, value, body = self.parse(('else', 'elif', 'endif'))
        cond.tests[0] = (cond.tests[0][0], body)
        while 1:
            if tag == 'else':
                if value:
                    self.fail('unexpected data after else')
                tag, value, cond.else_ = self.parse(('endif',))
            elif tag == 'elif':
                expr = self.parse_python(value, 'eval')
                tag, value, body = self.parse(('else', 'elif', 'endif'))
                cond.tests.append((expr, body))
                continue
            break
        if value:
            self.fail('unexpected data after endif')
        return cond