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-- helper script to execute same `callback` function for every section

-- to the same section belong blocks beginning by header and ending by last block before next header

-- it is possible to skip some header (= absorb it's content into current section),

-- with `condition` function, returning `true`

return function (blocks, callback, condition)

local start

local i = 1

repeat

local el = blocks[i]

if el.tag=="Header" and el.identifier~="" then

local skip = condition and condition(el, blocks, i)

if not skip then

if start then

i = callback(blocks, start, i) or i

assert(blocks[i]==el,"wrong index returned by callback")

end

start = i

end

i = i+1

until not blocks[i]

if start then

callback(blocks, start, i)

end