lua script support? + question about a specific file

[daisukidaisy]

ok so whitty mod found a way to implement complex accuracy via a .lua script file
(Kade_Engine_Complex_accuracy.lua in scripts folder)
is it currently possible to add this to leather engine? + how compatible is it?

[Leather128]

Well it's been about 6 days, and now I've gotta say that uhm... On the latest commits this lua script can be used to do what I think is the same thing the lua you are talking about does.

local a1 = 0.254829592;
local a2 = -0.284496736;
local a3 = 1.421413741;
local a4 = -1.453152027;
local a5 = 1.061405429;
local p = 0.3275911;
local curTotalNotesHit = 0
local counterUpdated = 0

local ourAccuracy = 0

local ratingStr = "N/A"

function playerOneSing(data, songPos, type, strumTime)
    updateAccuracy(strumTime, songPos, 0)
end

function updateAccuracy(strumTime, songPos, rOffset) -- HELPER FUNCTION
    local noteDiffSign = strumTime - songPos + rOffset
    local noteDiffAbs = math.abs(noteDiffSign)
    local totalNotesForNow = handleNoteDiff(noteDiffAbs)
    local rawJudgements = cancelExistingJudgements(noteDiffAbs)

    curTotalNotesHit = curTotalNotesHit + totalNotesForNow
    counterUpdated = counterUpdated + 1
    curAccuracy = curTotalNotesHit / counterUpdated
    ratingStr = accuracyToRatingString(curAccuracy * 100)

    ourAccuracy = math.max(0, curAccuracy)
end

function update(elapsed)
    setProperty("", "accuracy", roundDecimal(math.max(0, ourAccuracy) * 100, 3))
    setProperty("", "ratingStr", ratingStr)
end

function roundDecimal(value, precision)
    local multi = 1

    for i = 0, precision - 1 do
        multi = multi * 10
    end

    return math.floor(value * multi) / multi
end

function cancelExistingJudgements(diff) -- HELPER FUNCTION
    if diff < 46.0 then
        return 1.0
    elseif diff < 91.0 then
        return 0.75
    elseif diff < 136.0 then
        return 0.5
    else
        return 0.0
    end
end


function accuracyToRatingString(accuracy) -- HELPER FUNCTION
    -- Please don't cancel me for repeat if else statements blame python 3.10 for not releasing sooner
    if accuracy >= 99.9935 then
        return 'AAAAA'
    elseif accuracy >= 99.980 then
        return 'AAAA:'
    elseif accuracy >= 99.970 then
        return 'AAAA.'
    elseif accuracy >= 99.955 then
        return 'AAAA'
    elseif accuracy >= 99.90 then
        return 'AAA:'
    elseif accuracy >= 99.80 then
        return 'AAA.'
    elseif accuracy >= 99.70 then
        return 'AAA'
    elseif accuracy >= 99 then
        return 'AA:'
    elseif accuracy >= 96.50 then
        return 'AA.'
    elseif accuracy >= 93 then
        return 'AA'
    elseif accuracy >= 90 then
        return 'A:'
    elseif accuracy >= 85 then
        return 'A.'
    elseif accuracy >= 80 then
        return 'A'
    elseif accuracy >= 70 then
        return 'B'
    elseif accuracy >= 60 then
        return 'C'
    else
        return 'D'
    end
end

function handleNoteDiff(diff) -- HELPER FUNCTION
    local maxms = diff
    local ts = 1

    local max_points = 1.0;
    local miss_weight = -1.0; -- used to be -5.5; this should be a lot less harsh.
    local ridic = 5 * ts;
    local max_boo_weight = 166
    local ts_pow = 0.75;
    local zero = 65 * ts^ts_pow
    local power = 2.5;
    local dev = 22.7 * ts^ts_pow

    if (maxms <= ridic) then -- // anything below this (judge scaled) threshold is counted as full pts
        return max_points
    elseif (maxms <= zero) then -- // ma/pa region, exponential
        return max_points * erf((zero - maxms) / dev)
    elseif (maxms <= max_boo_weight) then -- // cb region, linear
        return (maxms - zero) * miss_weight / (max_boo_weight - zero)
    else
        return miss_weight
    end
end

function erf(x)  -- HELPER FUNCTION
    local sign = 1;
    if (x < 0) then
        sign = -1;
    end
    x = math.abs(x);
    local t = 1.0 / (1.0 + p * x);
    local y = 1.0 - (((((a5 * t + a4) * t) + a3) * t + a2) * t + a1) * t * math.exp(-x * x);

    return sign * y;
end

function playerOneMiss()
    updateAccuracy(400, 0, 0)
end

(yes this is basically just the whitty script but edited to work on leather engine)