hint: paragraph parsing

[Asko Kauppi <asko.kauppi@...>]

Linewise splitting of string data is quite trivial with string.gfind() 
but handling paragraphs (split at 2 or more newlines, with spaces 
ignored) is tougher.

Here's a solution I crafted, and which seems to work.  I was especially 
delighted by the usability of 'capture position' to get info where the 
iterator is going. I believe this trick can be usable elsewhere, too.  
Without it, you won't know if your patterns jump over stuff or not.

Here's the code fragment:

	local ret= {}
    local last_pos

    -- note: '()' captures the position index
    --
    for s, pos in string.gfind( str, "(.-\n%s*\n)()" ) do    -- hey, 
this works even with >2 linefeeds! (also linefeed is %s :)
        --
        --io.stderr:write( "<<<<<<\n"..s.."\n>>>>>>\n" )

        last_pos= pos   -- remember last position (for tail handling)

        Loc_AddParagraph( ret, s )
    end

    -- The left-overs..
    --
    Loc_AddParagraph( ret, string.sub( str, last_pos ) )

-ak