| | |
|---|
| | | local digit_sep_esc |
|---|
| | | do |
|---|
| | | local sep = technic.config:get("digit_separator") |
|---|
| | | sep = tonumber(sep) and string.char(sep) or sep or " " |
|---|
| | | -- Escape for gsub |
|---|
| | | for magic in ("().%+-*?[^$"):gmatch(".") do |
|---|
| | | if sep == magic then |
|---|
| | | sep = "%"..sep |
|---|
| | | end |
|---|
| | | local constant_digit_count = technic.config:get("constant_digit_count") |
|---|
| | | |
|---|
| | | -- converts a number to a readable string with SI prefix, e.g. 10000 → "10 k", |
|---|
| | | -- 15 → "15 ", 0.1501 → "150.1 m" |
|---|
| | | -- a non-breaking space (U+a0) instead of a usual one is put after number |
|---|
| | | -- The precision is 4 digits |
|---|
| | | local prefixes = {[-8] = "y", [-7] = "z", [-6] = "a", [-5] = "f", [-4] = "p", |
|---|
| | | [-3] = "n", [-2] = "µ", [-1] = "m", [0] = "", [1] = "k", [2] = "M", |
|---|
| | | [3] = "G", [4] = "T", [5] = "P", [6] = "E", [7] = "Z", [8] = "Y"} |
|---|
| | | function technic.pretty_num(num) |
|---|
| | | -- the small number added is due to floating point inaccuracy |
|---|
| | | local b = math.floor(math.log10(math.abs(num)) +0.000001) |
|---|
| | | local pref_i |
|---|
| | | if b ~= 0 then |
|---|
| | | -- b is decremented by 1 to avoid a single digit with many decimals, |
|---|
| | | -- e.g. instead of 1.021 MEU, 1021 kEU is shown |
|---|
| | | pref_i = math.floor((b - 1) / 3) |
|---|
| | | else |
|---|
| | | -- as special case, avoid showing e.g. 1100 mEU instead of 1.1 EU |
|---|
| | | pref_i = 0 |
|---|
| | | end |
|---|
| | | digit_sep_esc = sep |
|---|
| | | if not prefixes[pref_i] then |
|---|
| | | -- This happens for 0, nan, inf, very big values, etc. |
|---|
| | | if num == 0 then |
|---|
| | | -- handle 0 explicilty to avoid showing "-0" |
|---|
| | | if not constant_digit_count then |
|---|
| | | return "0 " |
|---|
| | | end |
|---|
| | | -- gives 0.000 |
|---|
| | | return string.format("%.3f ", 0) |
|---|
| | | end |
|---|
| | | return string.format("%.4g ", num) |
|---|
| | | end |
|---|
| | | |
|---|
| | | num = num * 10 ^ (-3 * pref_i) |
|---|
| | | if constant_digit_count then |
|---|
| | | local comma_digits_cnt = 3 - (b - 3 * pref_i) |
|---|
| | | return string.format("%." .. comma_digits_cnt .. "f %s", |
|---|
| | | num, prefixes[pref_i]) |
|---|
| | | end |
|---|
| | | return string.format("%.4g %s", num, prefixes[pref_i]) |
|---|
| | | end |
|---|
| | | |
|---|
| | | -- some unittests |
|---|
| | | assert(technic.pretty_num(-0) == "0 ") |
|---|
| | | assert(technic.pretty_num(0) == "0 ") |
|---|
| | | assert(technic.pretty_num(1234) == "1234 ") |
|---|
| | | assert(technic.pretty_num(123456789) == "123.5 M") |
|---|
| | | |
|---|
| | | function technic.pretty_num(num) |
|---|
| | | local str, k = tostring(num), nil |
|---|
| | | repeat |
|---|
| | | str, k = str:gsub("^(-?%d+)(%d%d%d)", "%1"..digit_sep_esc.."%2") |
|---|
| | | until k == 0 |
|---|
| | | return str |
|---|
| | | |
|---|
| | | -- used to display power values |
|---|
| | | function technic.EU_string(num) |
|---|
| | | return technic.pretty_num(num) .. "EU" |
|---|
| | | end |
|---|
| | | |
|---|
| | | |
|---|
