95 lines
1.8 KiB
Lua
95 lines
1.8 KiB
Lua
local function split(s, delimiter)
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local result = {};
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for match in (s..delimiter):gmatch("(.-)"..delimiter) do
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table.insert(result, match);
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end
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return result;
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end
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local function filter(tableIn, predicate)
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local out = {}
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for _, val in ipairs(tableIn) do
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if predicate(val) then
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table.insert(out, val)
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end
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end
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return out
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end
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local function clamp(x, min, max)
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if x < min then
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x = min
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end
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if x > max then
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x = max
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end
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return x
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end
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local function round(num)
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return num + (2^52 + 2^51) - (2^52 + 2^51)
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end
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local function sign(x)
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return (
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(x > 0) and 1
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or
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(x < 0) and -1
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or
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0
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)
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end
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local function roundToZero(x)
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if x < 0 then
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return math.ceil(x)
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elseif x > 0 then
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return math.floor(x)
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else
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return 0
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end
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end
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local function areaOverlap(x, y, areaX, areaY, areaW, areaH)
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return x > areaX and y > areaY and x < areaX + areaW and y < areaY + areaH
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end
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local function lerp(x, x0, y0, x1, y1)
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return y0 + (x - x0) * (y1 - y0) / (x1 - x0)
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end
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local function mix(x, y, a)
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return (1 - a) * x + a * y
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end
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--modulo operation for index value
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local function modIndex(index, mod)
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return (index - 1) % mod + 1
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end
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local function firstAlphaNum(s)
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for i = 1, string.len(s) do
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local byte = string.byte(s, i);
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if ((byte >= 65 and byte <= 90) or (byte >= 97 and byte <= 122) or (byte >= 48 and byte <= 57)) then
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return string.sub(s, i, i);
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end
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end
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return '';
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end
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return {
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split = split,
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filter = filter,
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clamp = clamp,
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round = round,
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sign = sign,
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roundToZero = roundToZero,
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areaOverlap = areaOverlap,
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lerp = lerp,
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mix = mix,
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modIndex = modIndex,
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firstAlphaNum = firstAlphaNum,
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}
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