181 lines
4.5 KiB
Lua
181 lines
4.5 KiB
Lua
--[[ Stateless utilities missing in lua standard library ]]
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---@param number number
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function round(number) return math.floor(number + 0.5) end
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---@param min number
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---@param value number
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---@param max number
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function clamp(min, value, max) return math.max(min, math.min(value, max)) end
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---@param rgba string `rrggbb` or `rrggbbaa` hex string.
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function serialize_rgba(rgba)
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local a = rgba:sub(7, 8)
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return {
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color = rgba:sub(5, 6) .. rgba:sub(3, 4) .. rgba:sub(1, 2),
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opacity = clamp(0, tonumber(#a == 2 and a or 'ff', 16) / 255, 1),
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}
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end
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-- Trim any `char` from the end of the string.
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---@param str string
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---@param char string
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---@return string
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function trim_end(str, char)
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local char, end_i = char:byte(), 0
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for i = #str, 1, -1 do
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if str:byte(i) ~= char then
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end_i = i
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break
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end
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end
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return str:sub(1, end_i)
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end
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---@param str string
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---@param pattern string
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---@return string[]
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function split(str, pattern)
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local list = {}
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local full_pattern = '(.-)' .. pattern
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local last_end = 1
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local start_index, end_index, capture = str:find(full_pattern, 1)
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while start_index do
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list[#list + 1] = capture
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last_end = end_index + 1
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start_index, end_index, capture = str:find(full_pattern, last_end)
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end
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if last_end <= (#str + 1) then
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capture = str:sub(last_end)
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list[#list + 1] = capture
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end
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return list
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end
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-- Get index of the last appearance of `sub` in `str`.
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---@param str string
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---@param sub string
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---@return integer|nil
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function string_last_index_of(str, sub)
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local sub_length = #sub
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for i = #str, 1, -1 do
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for j = 1, sub_length do
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if str:byte(i + j - 1) ~= sub:byte(j) then break end
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if j == sub_length then return i end
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end
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end
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end
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---@param itable table
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---@param value any
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---@return integer|nil
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function itable_index_of(itable, value)
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for index, item in ipairs(itable) do
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if item == value then return index end
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end
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end
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---@param itable table
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---@param compare fun(value: any, index: number)
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---@param from_end? boolean Search from the end of the table.
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---@return number|nil index
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---@return any|nil value
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function itable_find(itable, compare, from_end)
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local from, to, step = from_end and #itable or 1, from_end and 1 or #itable, from_end and -1 or 1
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for index = from, to, step do
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if compare(itable[index], index) then return index, itable[index] end
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end
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end
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---@param itable table
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---@param decider fun(value: any, index: number)
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function itable_filter(itable, decider)
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local filtered = {}
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for index, value in ipairs(itable) do
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if decider(value, index) then filtered[#filtered + 1] = value end
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end
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return filtered
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end
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---@param itable table
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---@param value any
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function itable_remove(itable, value)
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return itable_filter(itable, function(item) return item ~= value end)
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end
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---@param itable table
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---@param start_pos? integer
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---@param end_pos? integer
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function itable_slice(itable, start_pos, end_pos)
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start_pos = start_pos and start_pos or 1
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end_pos = end_pos and end_pos or #itable
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if end_pos < 0 then end_pos = #itable + end_pos + 1 end
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if start_pos < 0 then start_pos = #itable + start_pos + 1 end
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local new_table = {}
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for index, value in ipairs(itable) do
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if index >= start_pos and index <= end_pos then
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new_table[#new_table + 1] = value
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end
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end
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return new_table
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end
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---@generic T
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---@param a T[]|nil
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---@param b T[]|nil
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---@return T[]
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function itable_join(a, b)
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local result = {}
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if a then for _, value in ipairs(a) do result[#result + 1] = value end end
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if b then for _, value in ipairs(b) do result[#result + 1] = value end end
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return result
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end
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---@param target any[]
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---@param source any[]
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function itable_append(target, source)
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for _, value in ipairs(source) do target[#target + 1] = value end
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return target
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end
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---@param target any[]
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---@param source any[]
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---@param props? string[]
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function table_assign(target, source, props)
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if props then
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for _, name in ipairs(props) do target[name] = source[name] end
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else
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for prop, value in pairs(source) do target[prop] = value end
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end
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return target
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end
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---@generic T
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---@param table T
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---@return T
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function table_shallow_copy(table)
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local result = {}
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for key, value in pairs(table) do result[key] = value end
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return result
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end
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--[[ EASING FUNCTIONS ]]
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function ease_out_quart(x) return 1 - ((1 - x) ^ 4) end
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function ease_out_sext(x) return 1 - ((1 - x) ^ 6) end
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--[[ CLASSES ]]
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---@class Class
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Class = {}
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function Class:new(...)
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local object = setmetatable({}, {__index = self})
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object:init(...)
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return object
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end
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function Class:init() end
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function Class:destroy() end
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function class(parent) return setmetatable({}, {__index = parent or Class}) end
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