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