Is it possible to generate a table of contents based on h1/h2/h3 HTML tags?

Example:

toc()

< h1>test
< h2>test1
< h1>test2
< h2>test3
< h1>test4
< h2>test5

Results in:

1. test
1.1 test1
2. test2
2.1 test3
3. test4
3.1 test5

...the text...