[LPeg] How can I parse a subset of markdown?

["Soni L." <fakedme@...>]

http://stackoverflow.com/q/38514522/3691554

I'm trying to parse a subset of markdown into a tree with LPeg. The idea 
is simple but I'm not sure what I'm doing. The whole spec for the thing 
I'm doing is here[1] and yes, that's a master branch github link, there 
are still some things I need to work out.

So, the basic idea is that I have: (put in a code block because that's 
the only thing that does preformatted text/doesn't strip spaces here)

    `> ` blocks, where the space is (greedy, non-backtracking) optional, as
        in `lpeg.P(">") * lpeg.P(" ")^-1`.

    `    ` "blocks", behave like in markdown (i.e. everything until the 
end of
        the line is not interpreted as markdown).

    #-###### "blocks", behave like in GFM (i.e. what follows is not 
interpreted,
        except for inline elements). This is easy, with something 
similar to:

    --
    local header = (lpeg.P("#") * lpeg.P("#")^-5 * lpeg.C(non_eol^1)) / 
process_header_elements
    --

        (it's much easier to use a function capture here than doing it in
        pure LPeg.)

    triple-` blocks, these are trivial. they're inspired by github 
markdown.

    single-` "blocks", these are supported as inline elements in hash 
blocks.

And I think that describes the whole thing really. My main issue is 
combining all the parts together, not the individual parsing of each 
part. Then I need to collect it all into a table, which should also be 
pretty easy.

(Now that I look at it I see that MDXML is *so* much simpler than 
markdown that you can probably parse the whole thing with a single 
regex. But regex doesn't let me collect into a table like I want.)

[1]: https://github.com/SoniEx2/MDXML/blob/master/README.md

PS: This post may look like shit, I copypasted it from SO.

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