Модул:Table

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local p = {}

-- A number of functions, most of them imported from [[wikt:Module:table]], a
-- spinoff of [[Module:TableTools]].

local libraryUtil = require('libraryUtil')
local checkType = libraryUtil.checkType
local checkTypeMulti = libraryUtil.checkTypeMulti

local function _check(funcName, expectType)
	if type(expectType) == "string" then
		return function(argIndex, arg, nilOk)
			checkType(funcName, argIndex, arg, expectType, nilOk)
		end
	else
		return function(argIndex, arg, expectType, nilOk)
			if type(expectType) == "table" then
				checkTypeMulti(funcName, argIndex, arg, expectType, nilOk)
			else
				checkType(funcName, argIndex, arg, expectType, nilOk)
			end
		end
	end
end

--[[
	Returns a list of the keys in a table, sorted using either a default
	comparison function or a custom keySort function.
]]
function p.keysToList(t, keySort, checked)
	if not checked then
		local check = _check('keysToList')
		check(1, t, 'table')
		check(2, keySort, 'function', true)
	end
	
	local list = {}
	local index = 1
	for key, value in pairs(t) do
		list[index] = key
		index = index + 1
	end
	
	-- Place numbers before strings, otherwise sort using <.
	if not keySort then
		keySort = function(item1, item2)
			-- "number" < "string", so numbers will be sorted before strings.
			local type1, type2 = type(item1), type(item2)
			if type1 ~= type2 then
				return type1 < type2
			else
				return item1 < item2
			end
		end
	end
	
	table.sort(list, keySort)
	
	return list
end

--[[
	Iterates through a table, with the keys sorted using the keysToList function.
	If there are only numerical keys, sparseIpairs is probably more efficient.
]]
function p.sortedPairs(t, keySort)
	local check = _check('keysToList')
	check(1, t, 'table')
	check(2, keySort, 'function', true)
	
	local list = p.keysToList(t, keySort, true)
	
	local i = 0
	return function()
		i = i + 1
		local key = list[i]
		if key ~= nil then
			return key, t[key]
		else
			return nil, nil
		end
	end
end

--[[
	Returns true if all keys in the table are consecutive integers starting at 1.
--]]
function p.isArray(t)
	checkType("isArray", 1, t, "table")
	
	local i = 0
	for k, v in pairs(t) do
		i = i + 1
		if t[i] == nil then
			return false
		end
	end
	return true
end

-- { "a", "b", "c" } -> { a = 1, b = 2, c = 3 }
function p.invert(array)
	checkType("invert", 1, array, "table")
	
	local map = {}
	for i, v in ipairs(array) do
		map[v] = i
	end
	
	return map
end

--[[
	{ "a", "b", "c" } -> { ["a"] = true, ["b"] = true, ["c"] = true }
--]]
function p.listToSet(t)
	checkType("listToSet", 1, t, "table")
	
	local set = {}
	for _, item in ipairs(t) do
		set[item] = true
	end
	
	return set
end

--[[
	Recursive deep copy function
]]
function p.deepCopy(orig, noMetatable)
    local orig_type = type(orig)
    local copy
    if orig_type == 'table' then
        copy = {}
        for orig_key, orig_value in pairs(orig) do
            copy[p.deepCopy(orig_key, noMetatable)] = p.deepCopy(orig_value, noMetatable)
        end
        if not noMetatable then
        	setmetatable(copy, p.deepCopy(getmetatable(orig)))
        end
    else -- number, string, boolean, etc
        copy = orig
    end
    return copy
end


--[[
	Concatenates all values in the table that are indexed by a number, in order.
	sparseConcat{ a, nil, c, d }  =>  "acd"
	sparseConcat{ nil, b, c, d }  =>  "bcd"
]]
function p.sparseConcat(t, sep, i, j)
	local list = {}
	
	local list_i = 0
	for _, v in require("Module:TableTools").sparseIpairs(t) do
		list_i = list_i + 1
		list[list_i] = v
	end
	
	return table.concat(list, sep, i, j)
end


return p