ExperimentalGear/scripts/common/util.lua

local function areaOverlap(x, y, areaX, areaY, areaW, areaH)
    return x > areaX and y > areaY and x < areaX + areaW and y < areaY + areaH
end

--modulo operation for index value
local function modIndex(index, mod)
    return (index - 1) % mod + 1
end

local function firstAlphaNum(s)
  for i = 1, string.len(s) do
    local byte = string.byte(s, i);
    if ((byte >= 65 and byte <= 90) or (byte >= 97 and byte <= 122) or (byte >= 48 and byte <= 57)) then
      return string.sub(s, i, i);
    end
  end

  return '';
end

return {
    areaOverlap = areaOverlap,
    modIndex = modIndex,
    firstAlphaNum = firstAlphaNum,
}