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Documentation for this module may be created at Module:EntityListAbstract/doc

local util_args = require('Module:ArgsUtil')
local util_html = require("Module:HtmlUtil")
local util_map = require('Module:MapUtil')
local util_table = require("Module:TableUtil")
local util_text = require("Module:TextUtil")
local util_vars = require("Module:VarsUtil")
local i18n = require("Module:I18nUtil")
local lang = mw.getLanguage('en')

local LCS = require('Module:LuaClassSystem')

local p = LCS.class()
local h = {}

p.Entity = nil

function p:init(strs, opts)
	if not opts then opts = {} end
	self.sep = opts.sep or ','
	if not strs or (opts.alreadyCast and #strs == 0) then
		self.is_nil = true
		self.objs = {}
		return
	end
	if type(strs) == 'string' then
		strs = util_text.split(strs, self.sep)
	end
	
	-- so we can build a compound role from already-created objects
	-- instead of first having to cast back as string
	if opts.alreadyCast then
		self.objs = strs
	else
		self.objs = self:castEntities(strs, opts)
	end
end

function p:castEntities(strs, opts)
	if not self.Entity then
		error('Missing self.Entity, cannot cast')
	end
	local ret = {}
	for _, str in ipairs(strs) do
		ret[#ret+1] = self.Entity(str, opts)
	end
	return ret
end

function p.__ipairs(tbl)
	local function stateless_iter(tbl, i)
		-- Implement your own index, value selection logic
		i = i + 1
		local val = tbl.objs[i]
		if val ~= nil then return i, val end
	end

	-- return iterator function, table, and starting point
	return stateless_iter, tbl, 0
end

function p:iter()
	local i = 0
	local function localIter()
		i = i + 1
		local val = self.objs[i]
		if val ~= nil then return i, val end
	end
	return localIter
end

function p:exists()
	return not self.is_nil
end

function p:tostring()
	if self.is_nil then return end
	if self.objs then
		return util_table.concat(self, self.sep, tostring)
	end
	return 'Attempting to tostring something we cannot'
end

function p:first()
	return self.objs[1]
end

function p:names(opts)
	if self.is_nil then return end
	if not opts then opts = {} end
	local tbl = {}
	for _, obj in ipairs(self) do
		tbl[#tbl+1] = obj:name(opts)
	end
	return util_table.concat(tbl, opts.sep)
end

function p:get(length, opts)
	if self.is_nil then return end
	if not opts then opts = {} end
	local tbl = {}
	for _, obj in ipairs(self) do
		tbl[#tbl+1] = obj:get(length)
	end
	return util_table.concat(tbl, opts.sep)
end

function p:links(opts)
	if self.is_nil then return end
	if not opts then opts = {} end
	local tbl = {}
	for _, obj in ipairs(self) do
		tbl[#tbl+1] = obj:link(opts)
	end
	return util_table.concat(tbl, opts.sep)
end

function p:flairs(opts)
	if self.is_nil then return end
	if not opts then opts = {} end
	local tbl = {}
	for _, obj in ipairs(self) do
		tbl[#tbl+1] = obj:flair(opts)
	end
	return util_table.concat(tbl, opts.sep)
end

function p:flairlinks(opts)
	if self.is_nil then return end
	if not opts then opts = {} end
	local tbl = {}
	for _, obj in ipairs(self) do
		tbl[#tbl+1] = obj:flairlink(opts)
	end
	return util_table.concat(tbl, opts.sep)
end

function p:images(opts)
	if self.is_nil then return end
	if not opts then opts = {} end
	local tbl = {}
	for _, obj in ipairs(self) do
		tbl[#tbl+1] = obj:image(opts)
	end
	return util_table.concat(tbl, opts.sep or '')
end

function p:imagelinks(opts)
	if self.is_nil then return end
	if not opts then opts = {} end
	local tbl = {}
	for _, obj in ipairs(self) do
		tbl[#tbl+1] = obj:imagelink(opts)
	end
	return util_table.concat(tbl, opts.sep)
end

function p:has(len, str)
	for _, v in ipairs(self) do
		if v:get(len) == str then
			return true
		end
	end
	return false
end

function p:_or(entity)
	if self.is_nil then
		return entity
	end
	return self
end

return p
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