How to flatten a table in Lua 5.3+

This is a code I used for our game. It flattens a table and returns an associative table that maps a string key to its value.

Example:

So for what's the purpose of this thing? We used it as resource handles ^^
Kita mo yung resources sa log ng Counter Strike? Parang ganun.

So eto na siya:

Code:


local flatten
do
  local function _flatten(r, pr, ks, it, t, k, v)
    if v == nil then
      -- we're done
      if #ks == 0 then return r end
      -- unpack saved state (for ver 5.3 below just 'unpack')
      it, t, k, v = table.unpack(ks[#ks])
      ks[#ks] = nil
      pr[#pr] = nil
    else
      -- push the key as a prefix
      pr[#pr+1] = k
      if type(v) ~= 'table' then
        -- if it isnt a table, add to our results
        r[table.concat(pr, '.')] = tostring(v)
        pr[#pr] = nil
      else
        -- otherwise if it's a table save state
        ks[#ks + 1] = {it, t, k, v}
        it, t, k = pairs(v)
      end
    end

    return _flatten(r, pr, ks, it, t, it(t, k))
  end
  
  flatten = function(root)
    local it, t, v = pairs(root)
    return _flatten({}, {}, {}, it, t, it(t, v))
  end
    
end

Tell me kung may ganitong function na or optimal method. I made it in a few minutes and honestly hindi pa na u-unit test. However no bugs have been discovered yet that came from this function so far xD

Keep it up...

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Nice on up