modlib/func.lua

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-- Localize globals
local error, modlib, unpack = error, modlib, unpack
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-- Set environment
local _ENV = {}
setfenv(1, _ENV)
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no_op = function() end
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function curry(func, ...)
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local args = { ... }
return function(...) return func(unpack(args), ...) end
end
function curry_tail(func, ...)
local args = { ... }
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return function(...) return func(unpack(modlib.table.concat({...}, args))) end
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end
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function curry_full(func, ...)
local args = { ... }
return function() return func(unpack(args)) end
end
function args(...)
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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
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-- 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
-- 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
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function override_chain(func, override)
return function(...)
func(...)
return override(...)
end
end
function assert(value, callback)
if not value then
error(callback())
end
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end
--+ Calls func using the provided arguments, deepcopies all arguments
function call_by_value(func, ...)
return func(unpack(modlib.table.deepcopy{...}))
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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
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end
-- Export environment
return _ENV