[Python-markdown-discuss] Adding source line information to HTML nodes

Hi Waylan and all,

In ReText, we (Maurice van der Pot and I) want to implement the synchronized
scrolling of editor and preview areas. For that, we need to add the information
about source line numbers to the HTML.

Maurice has implemented an extension (attached below) that:

  * Has a preprocessor that inserts placeholders with text '$posmapmarker$N' to
    empty lines, where N is line number.

  * Has a block processor that parses these placeholders, gets the previous
    element, and sets an HTML attribute on it.

This works, but is a bit hacky, and also works only on top-level elements (for
example this way it's impossible to set source information on list items).

Does anybody know of a better way of implementing such a thing using our
extension API?

--
Dmitry Shachnev