modlib/func.lua
2021-07-14 10:26:57 +02:00

175 lines
3.1 KiB
Lua

-- Localize globals
local error, coroutine, modlib, unpack
= error, coroutine, modlib, unpack
-- Set environment
local _ENV = {}
setfenv(1, _ENV)
no_op = function() end
function curry(func, ...)
local args = { ... }
return function(...) return func(unpack(args), ...) end
end
function curry_tail(func, ...)
local args = { ... }
return function(...) return func(unpack(modlib.table.concat({...}, args))) end
end
function curry_full(func, ...)
local args = { ... }
return function() return func(unpack(args)) end
end
function args(...)
local args = { ... }
return function(func) return func(unpack(args)) end
end
function value(val) return function() return val end end
function values(...)
local args = { ... }
return function() return unpack(args) end
end
-- Equivalent to `for x, y, z in iterator(...) do callback(x, y, z) end`
function iterate(callback, iterator, ...)
local function _iterate(iterable, state, ...)
local function loop(...)
if ... == nil then return end
callback(...)
return loop(iterable(state, ...))
end
return loop(iterable(state, ...))
end
return _iterate(iterator(...))
end
function for_generator(caller, ...)
local co = coroutine.create(function(...)
return caller(function(...)
return coroutine.yield(...)
end, ...)
end)
local args = {...}
return function()
if coroutine.status(co) == "dead" then
return
end
local function _iterate(status, ...)
if not status then
error((...))
end
return ...
end
return _iterate(coroutine.resume(co, unpack(args)))
end
end
-- Does not use select magic, stops at the first nil value
function aggregate(binary_func, total, ...)
if total == nil then return end
local function _aggregate(value, ...)
if value == nil then return end
total = binary_func(total, value)
return _aggregate(...)
end
_aggregate(...)
return total
end
function override_chain(func, override)
return function(...)
func(...)
return override(...)
end
end
function assert(value, callback)
if not value then
error(callback())
end
end
--+ Calls func using the provided arguments, deepcopies all arguments
function call_by_value(func, ...)
return func(unpack(modlib.table.deepcopy{...}))
end
-- Functional wrappers for Lua's builtin metatable operators (arithmetic, concatenation, length, comparison, indexing, call)
function add(a, b)
return a + b
end
function mul(a, b)
return a * b
end
function div(a, b)
return a / b
end
function mod(a, b)
return a % b
end
function pow(a, b)
return a ^ b
end
function unm(a)
return -a
end
function concat(a, b)
return a .. b
end
function len(a)
return #a
end
function eq(a, b)
return a == b
end
function lt(a, b)
return a < b
end
function le(a, b)
return a <= b
end
function index(object, key)
return object[key]
end
function newindex(object, key, value)
object[key] = value
end
function call(object, ...)
object(...)
end
-- Functional wrappers for logical operators, suffixed with _ to avoid a syntax error
function not_(a)
return not a
end
function and_(a, b)
return a and b
end
function or_(a, b)
return a or b
end
-- Export environment
return _ENV