data-updates.lua

local fuel_values = {
  ["crude-oil"] = "1.4MJ",
  ["light-oil"] = "1.5MJ",
  ["heavy-oil"] = "1MJ",
  ["petroleum-gas"] = "1.5MJ",
  ["diesel-fuel"] = "2MJ",
}

local emissions = {
  ["crude-oil"] = 1.4,
  ["light-oil"] = 1.2,
  ["heavy-oil"] = 1.3,
  ["petroleum-gas"] = 1,
  ["diesel-fuel"] = 0.8,
}

local parse_energy = function(energy)
  local ending = energy:sub(energy:len())
  if not (ending == "J" or ending == "W") then
    error(ending.. " is not a valid unit of energy")
  end
  local magnitude = energy:sub(energy:len() - 1, energy:len() - 1)
  local multiplier = 1
  if type(magnitude) == "number" then
    return tonumber(energy:sub(1, energy:len()-1))
  end
  local char = {
    k = 1000,
    M = 1000000,
    G = 1000000000,
    T = 1000000000000,
    P = 1000000000000000,
    E = 1000000000000000000,
    Z = 1000000000000000000000,
    Y = 1000000000000000000000000
  }
  multiplier = char[magnitude]
  if not multiplier then error(magnitude.. " is not valid magnitude") end
  return tonumber(energy:sub(1, energy:len()-2)) * multiplier
end

local names = {}

for k, fluid in pairs (data.raw.fluid) do
  if not fluid.fuel_value then
    fluid.fuel_value = fuel_values[fluid.name]
  end
  if not fluid.emissions_multiplier then
    fluid.emissions_multiplier = emissions[fluid.name]
  end
end