local p = {}  
function p.main  
--Get input arguments
local args = require('Module:Arguments').getArgs(,{valueFunc =
function(key,value)
if value then
value = mw.text.trim(value)
--Change empty string to nil for all args except 'image' and ''
if key=="image" or key=="" or value~="" then
return value
end
end
return nil
end
})  
--Call main function
return p.luaMain(,args)  
end  
function p.luaMain(,args)  
local function emp2nil(x)
if x=="" then return nil else return x end
end
local function space2emp(x)
if string.find(x,"^%s*$") then return "" else return x end
end
local function nopx(x)
if x~=nil and (string.find(x,"^%d+$") or string.find(x,"^%d+px$")) then return string.gsub(x,"^(.*)px","%1") else return nil end
end  
--Country & mode parameters
local mode = string.lower(args[1] or "usc")
local mi = string.sub(mode,1,1)
local ms = string.sub(mode,2,2)
local mn = string.sub(mode,3,3)
local me = string.sub(mode,4,-1)  
local country = args[2] or ""
local avar = args["avar"] or args["altvar"]
local clink = args["clink"] or args["link"]  
--Get country data & altvar data
local data, alink, amap, asuf
if avar then
local age = args["age"] or ""
local aalias
amap, aalias = require("Module:Flagg/Altvar data").alttable(age)
avar = string.gsub(string.lower(avar or ""),"[ \-]","")
avar = aalias[avar] or avar
if not amap[avar] then error("Unknown avar") end
local apar = {altvar=amap[avar].altvar;mw=amap[avar].mw;age=amap[avar].age;variant=args["variant"] or args[3]}
data = require("Module:CountryData").gettable(,country,apar)
asuf = amap[avar].altlink
alink = data["link alias-"..amap[avar].altvar] or (clink or data["shortname alias"] or data.alias or country).." "..asuf
else
data = (args["nodata"] and {}) or require("Module:CountryData").gettable(,country,{variant=args["variant"] or args[3]})
avar = ""
amap = {[""]={altvar=""}}
end  
--Name and link parameters
clink = clink or data.alias or country  
local pref = args["pref"]
local suff = args["suff"] or asuf
if not pref and not suff then --Default prefix
pref = "Flag of"
end
local yn_map = {[""]=0; ["0"]=0; ["no"]=0; ["n"]=0; ["1"]=1; ["yes"]=1; ["y"]=1}
local fthe = (args["pthe"] and yn_map[args["pthe"]]~=0) or (args["the"] and yn_map[args["the"]]~=0)
local nthe = (args["nthe"] and yn_map[args["nthe"]]~=0) or (args["the"] and yn_map[args["the"]]~=0)
fthe = fthe and (pref and "t" or "T").."he " or ""
nthe = nthe and (pref and "t" or "T").."he " or ""
local flink = args["plink"] or args["flink"] or alink
or clink=="" and "" or space2emp((pref or "").." ")..fthe..clink..space2emp(" "..(suff or ""))
local fsec = args["psection"] or args["section"]
local csec = args["csection"] or args["section"]
fsec = fsec and "#"..fsec or ""
csec = csec and "#"..csec or ""  
if string.find(me,"f") then
if mw.title.new( flink ).exists == false then
flink = clink
end
end  
local name = args["name"]
if not name then
local cname = string.find(me,"e") and (data["name alias-"..amap[avar].altvar] or data["shortname alias"] or data.alias) or country
if mn == "f" then
name = cname=="" and "" or space2emp((pref or "").." ")..nthe..cname..space2emp(" "..(suff or ""))
else
name = cname
end
end  
--Image parameters
local pimage = args["image"]
local placeholder = "Flag placeholder.svg"
local variant = args["variant"] or args[3] or ""
local image_map = {[""]=placeholder; [""]=placeholder; ["blank"]=placeholder}
if pimage then --Remove namespace
pimage = string.gsub(pimage,"^[Ff][Ii][Ll][Ee]:","")
pimage = string.gsub(pimage,"^[Ii][Mm][Aa][Gg][Ee]:","")
end
local iname = image_map[pimage] or pimage  
local size = args["size"] or args["sz"]
local size_map = {xs="12x8px"; s="17x11px"; m="23x15px"; l="32x21px"; xl="46x30px"}
if size==nil or string.find(size,"^%d*x?%d+px$") then
--valid EIS size (..px, x..px or ..x..px) or unset
elseif string.find(size,"^%d*x?%d+$") then --EIS size without "px" suffix
size=size.."px"
else --size from map, or invalid value
size = size_map[size] or nil
end
local = args[""]  
if iname then
size = size or "23x15px"
if yn_map[]==0 then = "" else = "|" end
else
iname = data["flag alias-"..amap[avar].altvar.."-"..variant] or data["flag alias-"..variant] or data["flag alias-"..amap[avar].altvar] or data["flag alias"] or placeholder
size = size or emp2nil(data.size) or "23x15px"
if then
if yn_map[]==0 then = "" else = "|" end
else
local autoborder = data["-"..variant] or data["-"..amap[avar].altvar] or data.
if autoborder and autoborder~="" then = "" else = "|" end
end
end  
local am = ""
if args["alt"] or string.find(me,"a") then
am = args["alt"] or args["name"] or country
am = am.."|"..am
end  
--Build display name
local text = args["text"]
if not text then
if mn=="x" then --no text
text = ""
elseif mn=="p" or mn=="f" then --prefix/suffix link
text = flink=="" and name or ""..name..""
elseif mn=="b" then --both prefix/suffix and normal country link
local preflink = pref and (flink=="" and pref.." " or ""..pref.." ") or ""
local sufflink = suff and (flink=="" and " "..suff or " "..suff.."") or ""
local namelink = (name=="" and "" or nthe)..(clink=="" and name or ""..name.."")
text = preflink..namelink..sufflink
elseif mn=="d" then --data template
local title = mw.title.new("Template:Country data "..country)
--check if redirect
if title.isRedirect then
text = "<span class=\"plainlinks\">["..title:fullUrl("redirect=no").." "..name.."]</span>"
else
text = ""..name..""
end
elseif mn=="u" then --unlinked
text = name
else --country link (default)
text = clink=="" and name or ""..name..""
end
end  
--Build image
local ilink = args["ilink"]
if not ilink then
if mi=="x" or (iname==placeholder and pimage~=placeholder) then --no image/invisible image
iname = placeholder
= ""
ilink = "|link="
am = ""
elseif mi=="i" then --image page link
ilink = ""
elseif mi=="c" then --country link
ilink = "|link="..clink..(clink=="" and "" or csec)
elseif mi=="p" or mi=="f" then --prefix/suffix link
ilink = "|link="..flink..(flink=="" and "" or fsec)
elseif mi=="d" then --data template
local title = mw.title.new("Template:Country data "..country)
--check if redirect
if title.isRedirect then
ilink = "|link="..title:fullUrl("redirect=no")
else
ilink = "|link="..title.fullText
end
else --unlinked (default)
ilink = "|link="
end
end
if am == "" and string.find(me,"l") then
am = mw.ustring.sub(ilink,7,-1)
end
local image = ""  
if iname==placeholder then
if require('Module:yesno')(args["noredlink"]) == false then
iname = ''
image = ":Template:Country data "..country..""
end
if (args["missingcategory"] or *) ~= * then
image = image..args["missingcategory"]
end
if string.find(me,"b") then
text = ''
end
end  
--Combine image and name with separator
local align = args["align"] or args["al"]
local nalign = args["nalign"] or args["nal"]
local align_map = {="", l="", ="", centre="", c="", middle="", m="", ="", r=""}
local out
if string.find(me,"r") then
--image of name
if (ms=="x" and mi=="x") or (string.find(me,"o") and iname==placeholder and pimage~=placeholder) then --name only
out = text
elseif ms=="x" then --no separator
out = text.."<span class=\"flagicon\">"..image.."</span>"
elseif ms=="n" then --non-breaking space
out = text.."<span class=\"flagicon\">&nbsp;"..image.."</span>"
elseif ms=="l" then --line break
out = text.."<span class=\"flagicon\">
"..image.."</span>"
elseif ms=="t" then --table cell
out = "style=\"text-align:"..(align_map[nalign] or "").."\"|"..text.."||style=\"text-align:"..(align_map[align] or "")..";\"|<span class=\"flagicon\">"..image.."</span>"
else --fixed-width span box (default)
local width = args["width"] or args["w"] or require("Module:Flaglist").luawidth(size)
out = text.."&nbsp;<span class=\"flagicon\" style=\"display:inline-block;width:"..width.."px;text-align:"..(align_map[align] or "")..";\">"..image.."</span>"
end
else --image of name
if (ms=="x" and mi=="x") or (string.find(me,"o") and iname==placeholder and pimage~=placeholder) then --name only
out = text
elseif ms=="x" then --no separator