View source for Module:Enum

-- <nowiki> awawa
local libraryUtil = require('libraryUtil')
local checkType = libraryUtil.checkType
local checkTypeMulti = libraryUtil.checkTypeMulti
local p = {}

function p.all(enum, fn, clone)
	checkType('Module:Enum.all', 1, enum, 'table')
	checkType('Module:Enum.all', 2, fn, 'function', true)
	checkType('Module:Enum.all', 3, clone, 'boolean', true)
	if clone then enum = mw.clone(enum) end
	fn = fn or function(item) return item end
	for _, item in ipairs(enum) do
		if not fn(item) then
			return false
		end
	end
	return true
end

function p.any(enum, fn, clone)
	checkType('Module:Enum.any', 1, enum, 'table')
	checkType('Module:Enum.any', 2, fn, 'function', true)
	checkType('Module:Enum.any', 3, clone, 'boolean', true)
	if clone then enum = mw.clone(enum) end
	fn = fn or function(item) return item end
	for _, item in ipairs(enum) do
		if fn(item) then
			return true
		end
	end
	return false
end

function p.contains(enum, elem, clone)
	checkType('Module:Enum.contains', 1, enum, 'table')
	checkType('Module:Enum.contains', 3, clone, 'boolean', true)
	if clone then enum = mw.clone(enum); elem = mw.clone(elem) end
	return p.any(enum, function(item) return item == elem end)
end

function p.each(enum, fn, clone)
	checkType('Module:Enum.each', 1, enum, 'table')
	checkType('Module:Enum.each', 2, fn, 'function')
	checkType('Module:Enum.each', 3, clone, 'boolean', true)
	if clone then enum = mw.clone(enum) end
	for _, item in ipairs(enum) do
		fn(item)
	end
end

function p.filter(enum, fn, clone)
	checkType('Module:Enum.filter', 1, enum, 'table')
	checkType('Module:Enum.filter', 2, fn, 'function', true)
	checkType('Module:Enum.filter', 3, clone, 'boolean', true)
	if clone then enum = mw.clone(enum) end
	fn = fn or function(item) return item end
	local r = {}
	for _, item in ipairs(enum) do
		if fn(item) then
			table.insert(r, item)
		end
	end
	return r
end

function p.find(enum, fn, default, clone)
	checkType('Module:Enum.find', 1, enum, 'table')
	checkType('Module:Enum.find', 2, fn, 'function')
	checkType('Module:Enum.find', 4, clone, 'boolean', true)
	if clone then enum = mw.clone(enum); default = mw.clone(default) end
	for _, item in ipairs(enum) do
		if fn(item) then
			return item
		end
	end
	return default
end

function p.find_index(enum, fn, default, clone)
	checkType('Module:Enum.find_index', 1, enum, 'table')
	checkType('Module:Enum.find_index', 2, fn, 'function')
	checkType('Module:Enum.find_index', 4, clone, 'boolean', true)
	if clone then enum = mw.clone(enum); default = mw.clone(default) end
	for index, item in ipairs(enum) do
		if fn(item) then
			return index
		end
	end
	return default
end

function p.newIncrementor(start, step)
	checkType('Module:Enum.newIncrementor', 1, start, 'number', true)
	checkType('Module:Enum.newIncrementor', 2, step, 'number', true)
	step = step or 1
	local n = (start or 1) - step
	local obj = {}
	return setmetatable(obj, {
		__call = function() n = n + step return n end,
		__tostring = function() return n end,
		__index = function() return n end,
		__newindex = function(self, k, v)
			if k == 'step' and type(v) == 'number' then
				step = v
			elseif type(v) == 'number' then
				n = v
			end
		end,
		__concat = function(x, y) return tostring(x) .. tostring(y) end
	})
end

function p.intersect(enum1, enum2, clone)
	checkType('Module:Enum.intersect', 1, enum1, 'table')
	checkType('Module:Enum.intersect', 2, enum2, 'table')
	checkType('Module:Enum.intersect', 3, clone, 'boolean', true)
	if clone then enum1 = mw.clone(enum1); enum2 = mw.clone(enum2) end
	local enum2Elements = {}
	local res = {}
	p.each(enum2, function(item) enum2Elements[item] = true end)
	p.each(enum1, function(item)
		if enum2Elements[item] then
			table.insert(res, item)
		end
	end)
	return res
end

function p.intersects(enum1, enum2, clone)
	checkType('Module:Enum.intersects', 1, enum1, 'table')
	checkType('Module:Enum.intersects', 2, enum2, 'table')
	checkType('Module:Enum.intersects', 3, clone, 'boolean', true)
	if clone then enum1 = mw.clone(enum1); enum2 = mw.clone(enum2) end
	return p.any(enum1, function(item1) return p.any(enum2, function(item2) return item1==item2 end) end)
end

function p.insert(enum1, enum2, index, clone)
	checkType('Module:Enum.insert', 1, enum1, 'table')
	checkType('Module:Enum.insert', 2, enum2, 'table')
	checkType('Module:Enum.insert', 3, index, 'number', true)
	checkType('Module:Enum.insert', 4, clone, 'boolean', true)
	if clone then enum1 = mw.clone(enum1); enum2 = mw.clone(enum2) end
	local len1 = #enum1
	local len2 = #enum2
	index = index or (len1 + 1)
	local res = {}

	for i = 1, (len1 + len2) do
		if i < index then
			res[i] = enum1[i]
		elseif i < (index + len2) then
			res[i] = enum2[i - index + 1]
		else
			res[i] = enum1[i - len2]
		end
	end

	return res
end

function p.map(enum, fn, clone)
	checkType('Module:Enum.map', 1, enum, 'table')
	checkType('Module:Enum.map', 2, fn, 'function')
	checkType('Module:Enum.map', 3, clone, 'boolean', true)
	if clone then enum = mw.clone(enum) end
	local r = {}
	for _, item in ipairs(enum) do
		local temp = fn(item) -- Only use first returned item
		table.insert(r, temp)
	end
	return r
end

function p.max_by(enum, fn, clone)
	checkType('Module:Enum.max_by', 1, enum, 'table')
	checkType('Module:Enum.max_by', 2, fn, 'function')
	checkType('Module:Enum.max_by', 3, clone, 'boolean', true)
	if clone then enum = mw.clone(enum) end
	return unpack(p.reduce(enum, function(new, old)
		local y = fn(new)
		return y > old[2] and {new, y} or old
	end, {0, 0}))
end

function p.range(start, stop, step)
	checkType('Module:Enum.range', 1, start, 'number')
	checkType('Module:Enum.range', 2, stop, 'number', true)
	checkType('Module:Enum.range', 3, step, 'number', true)
	local array = {}
	if not stop then
		stop = start
		start = 1
	end
	local j = 1
	for i = start, stop, step or 1 do
		array[j] = i
		j = j + 1
	end
	return array
end

function p.reduce(enum, fn, accumulator, clone)
	checkType('Module:Enum.reduce', 1, enum, 'table')
	checkType('Module:Enum.reduce', 2, fn, 'function')
	checkType('Module:Enum.reduce', 4, clone, 'boolean', true)
	if clone then enum = mw.clone(enum); accumulator = mw.clone(accumulator) end
	local acc = accumulator
	for index, item in ipairs(enum) do
		if index == 1 and not accumulator then
			acc = item
		else
			acc = fn(item, acc)
		end
	end
	return acc
end

function p.reject(enum, fn, clone)
	checkType('Module:Enum.reject', 1, enum, 'table')
	checkTypeMulti('Module:Enum.reject', 2, fn, {'function', 'table', 'nil'})
	checkType('Module:Enum.reject', 3, clone, 'boolean', true)
	if clone then enum = mw.clone(enum) end
	fn = fn or function(item) return item end
	local r = {}
	if type(fn) == 'function' then
		for index, item in ipairs(enum) do
			if not fn(item, index) then
				table.insert(r, item)
			end
		end
	else
		local rejectMap = {}
		for _, item in ipairs(fn) do
			rejectMap[item] = true
		end
		for _, item in ipairs(enum) do
			if not rejectMap[item] then
				table.insert(r, item)
			end
		end
	end
	return r
end

function p.scan(enum, fn, accumulator, clone)
	checkType('Module:Enum.scan', 1, enum, 'table')
	checkType('Module:Enum.scan', 2, fn, 'function')
	checkType('Module:Enum.scan', 4, clone, 'boolean', true)
	if clone then enum = mw.clone(enum); accumulator = mw.clone(accumulator) end
	local acc = accumulator
	local r = {}
	for index, item in ipairs(enum) do
		if index == 1 and not accumulator then
			acc = item
		else
			acc = fn(item, acc)
		end
		table.insert(r, acc)
	end
	return r
end

function p.slice(enum, start, finish, clone)
	checkType('Module:Enum.slice', 1, enum, 'table')
	checkType('Module:Enum.slice', 2, start, 'number', true)
	checkType('Module:Enum.slice', 3, finish, 'number', true)
	checkType('Module:Enum.slice', 4, clone, 'boolean', true)
	if clone then enum = mw.clone(enum) end
	start = start or 1
	finish = finish or #enum
	local r = {}
	for index, item in ipairs(enum) do
		if index >= start and index <= finish then
			table.insert(r, item)
		end
	end
	return r
end

function p.split(enum, count, clone)
	checkType('Module:Enum.split', 1, enum, 'table')
	checkType('Module:Enum.split', 2, count, 'number')
	checkType('Module:Enum.split', 3, clone, 'boolean', true)
	if clone then enum = mw.clone(enum) end
	if #enum < count then
		return enum, {}
	elseif count < 1 then
		return {}, enum
	end

	local x = {}
	local y = {}

	for i = 1, #enum do
		table.insert(
			i <= count and x or y,
			enum[i]
		)
	end
	return x, y
end

function p.sum(enum, clone)
	checkType('Module:Enum.sum', 1, enum, 'table')
	checkType('Module:Enum.sum', 2, clone, 'boolean', true)
	if clone then enum = mw.clone(enum) end
	return p.reduce(enum, function(x, y) return x + y end)
end

function p.take(enum, count, clone)
	checkType('Module:Enum.take', 1, enum, 'table')
	checkType('Module:Enum.take', 2, count, 'number')
	checkType('Module:Enum.take', 3, clone, 'boolean', true)
	if clone then enum = mw.clone(enum) end
	local x, _ = p.split(enum, count)
	return x
end

function p.take_every(enum, n, clone)
	checkType('Module:Enum.take_every', 1, enum, 'table')
	checkType('Module:Enum.take_every', 2, n, 'number')
	checkType('Module:Enum.take_every', 3, clone, 'boolean', true)
	if clone then enum = mw.clone(enum) end
	local r = {}
	for index, item in ipairs(enum) do
		if (index - 1) % n == 0 then
			table.insert(r, item)
		end
	end
	return r
end

function p.take_from(enum, index, count)
	checkType('Module:Enum.take_from', 1, enum, 'table')
	checkType('Module:Enum.take_from', 2, index, 'number')
	checkType('Module:Enum.take_from', 3, count, 'number')
	local x, _ = p.split(p.reject(enum,
		function(item, idx)
			return idx < index
		end
	), count)
	return x
end

function p.unique(enum, fn, clone)
	checkType('Module:Enum.unique', 1, enum, 'table')
	checkType('Module:Enum.unique', 2, fn, 'function', true)
	checkType('Module:Enum.unique', 3, clone, 'boolean', true)
	if clone then enum = mw.clone(enum) end
	fn = fn or function(item) return item end
	local r = {}
	local hash = {}
	for _, item in ipairs(enum) do
		local id = fn(item)
		if not hash[id] then
			table.insert(r, item)
			hash[id] = true
		end
	end
	return r
end

function p.zip(enums, clone)
	checkType('Module:Enum.zip', 1, enums, 'table')
	checkType('Module:Enum.zip', 2, clone, 'boolean', true)
	if clone then enums = mw.clone(enums) end
	local r = {}
	local _, longest = p.max_by(enums, function(enum) return #enum end)
	for i = 1, longest do
		local q = {}
		for j = 1, #enums do
			table.insert(q, enums[j][i])
		end
		table.insert(r, q)
	end
	return r
end

return p
-- </nowiki>
Description	What you type	What you get
Italic	''Italic text''	Italic text
Bold	'''Bold text'''	Bold text
Bold & italic	'''''Bold & italic text'''''	*Bold & italic text*