txtBlock = '

para text 
block 1



para text 
block 2
'


text = '
! section!1

some text as a 

block asdf

!! section 1.1 

* ul.li
* ul.li
** ul.ul.li

! seciton 2

{{{
    pre block
}}}

slice: value 1

/%some hidden
text%/
'

ometa P {
  text  = (~'\n' char)+:c           -> c.join(''),

  pIndi = (``\n\n'')+,
  paraBlock = (~pIndi char)+:c      -> c.join(''),
  para = pIndi paraBlock:y       -> ['p', y]
         | para:xx -> ['xx',xx],

  sIndi = ``\n! '',
//  sBlock = (~sIndi char)+:c               -> c.join(''),
  sBlock = (~sIndi para)*:x                 -> x,
  section = sIndi spaces text:t sBlock:x  -> ['h1', t, x],
 

  hStart = ``/%'',
  hEnd   = ``%/'',
  hBlock = (~hEnd char)+:c            -> c.join(''),
  hidden = hStart hBlock:x            -> ['hidden', x],

//  h1    = ``!'' spaces text:x         -> ['h1', x],
//  h2    = ``!!'' spaces text:x        -> ['h2', x],
//  line         = h2 | h1,
  line = section | hidden | para,

//  linef        = line:l '\n'               -> l
//               | line | '\n',

  linef        = line:l                -> l
                 | line,

  expr         = linef*:l                  -> l.join('')
}

tree = P.matchAll(txtBlock, 'para')