Module:Flags
All the logics of Template:Flags are handled here. This module works together with Module:Flags/MasterData and Module:Flags/LocaleData, where the flags data is maintained.
Features
rættaFunctionality implemented:
- Full name in English or the locale language: "Andorra".
- 2 letter code - link points to full name: "AD"
- 3 letter code - link points to full name: "AND"
- Nepal and Ohio flags are shown without border.
- When a name is not found in the list, attempts to offer a Commons image and a link e.g. "Berlin" or "WHO".
- Size as in "size=44px" or "size=40x44px" can be defined in any position.
- Nepal, Switzerland and Vatican City have a default size of 20x17px (for the rest it's 20x22px):
- Variants for historical flags "1901"
or "variant=1901" (for compatibility reasons) - Variants for labeled flags: "naval", "air force" and any other specified at FlagTranslations: "civil"
- "naval-RMAS" 
- Variant / label flags not found in FlagTranslations return the Flag of None but still point to the right article: "whatever"
- "quatsch" - Redirects (different names pointing to a same flag) are supported: "GB"
- "UK" - Full Commons filenames can be defined in tables when they don't follow the "Flag of " syntax: "File:Flag Belgium brussels"
- Localization: "Illes Balears"
- "中華人民共和國" 
- Localization + variants: "Afganistan" + "1901" - "Regne Unit" + "civil"
- Flags listed only in FlagTranslations always link to the local language article: parameter "Native Peoples of Colombia"
links to "Pueblos Indígenas de Colombia"
Roadmap
rætta- Performance testing.
- Extensive testing with copies of real pages, also for non-Latin scripts and Right-to-left languages.
- Cover the rest of functionality offered by other flag templates.
- Allow editors to define the year of the event, leaving to the template the task of finding the right flag.
local p = {}
-- Loading the flag translations module --
local translations = mw.loadData("Module:Flags/LocaleData")
local master = mw.loadData("Module:Flags/MasterData")
-- check if name is an original name in translation.fullname and
-- return its value, otherwise return nil
function check_translation(name)
local link
for translation, commonsName in pairs(translations.fullName) do
if commonsName == name then
link = translation
break --if found break out from the loop
end
end
return link
end
-- Size of flag --
-- Function to define the default size for the flag if needed
function defaultSize()
--todo: move exception to Module:Flags/MasterData
local sizeExceptions = { "Nepal", "Switzerland", "the Vatican City", }
local size = "20x22px" --initialize with default value
for some,exceptions in pairs(sizeExceptions) do
if commonsName == exceptions then
size = "20x17px"
break --if found break out from loop
end
end
return size
end
-- Assigning the parameter to a flag and a link
function p.flag(territory)
--always declare local variable, they are more efficient and dont pollute global namespace
local commonsName
local flagOf = "Flag_of_" -- Converts "Flag of" in a variable in order to accept images that don't follow this name schema
local link = ""
-- more efficient to access
local flag_code = territory.args[1] or ""
-- Searching in the master table only.
-- 2 letter code search
if #flag_code == 2 then
-- try to assign a value to commonsName and check for nil value
commonsName = master.twoLetter[flag_code]
--if check_translation return nil then it will execute the or part and assign commonsName to link
if commonsName then link = check_translation(commonsName) or commonsName; end
elseif #flag_code == 3 then -- 3 letter code search
commonsName = master.threeLetter[flag_code]
if commonsName then link = check_translation(commonsName) or commonsName; end
end
-- check if commonsName is still nil
if commonsName == nil then
-- check master.fullName table
commonsName = master.fullName[flag_code]
if commonsName then
link = check_translation(commonsName) or commonsName;
else -- Searching in FlagTranslations
commonsName = translations.fullName[flag_code]
if commonsName then
link = flag_code
else -- Fallback to Commons when the parameter doesn't have an entry in the tables
commonsName = flag_code
link = flag_code
end
end
end
-- Variant check for historical flags --
local variant = territory.args[3]
if variant and variant ~= "" then
commonsName = master.variant[commonsName .. "|" .. variant]
flagOf=""
end
-- Label check --
variant = territory.args[2]
if variant and variant ~="{{{2}}}" then
commonsName = master.variant[commonsName .. "|" .. variant]
flagOf=""
end
-- Digesting Commons flag files not following the format "Flag of "
-- These filenamess must be preceded by "File:" in the table values.
if commonsName ~= nil and string.find( commonsName, "File:", 1 ) == 1 then
commonsName = string.sub( commonsName, 6)
flagOf=""
end
-- Fallback for non-identified variant/label flags --
if commonsName == nil then commonsName = "Flag of None" end
-- Border for everybody except Nepal and Ohio
-- todo: move exception to Module:Flags/MasterData
local border = "border|"
if commonsName == "Nepal" or commonsName == "Ohio" then
border = ""
end
-- Checking whether a size parameter has been introduced, otherwise set default
if territory.args[4]:find("px", -2) ~= nil then
size = territory.args[4]
else
size = defaultSize(commonsName)
end
-- Customizing the link
openBrackets = "[["
closeBrackets = "]]"
if territory.args[5] == "" then
flagLink = ""
textLink = ""
openBrackets = ""
closeBrackets = ""
elseif territory.args[5] ~= "{{{link}}}" then
flagLink = territory.args[5]
textLink = territory.args[5] .. "|"
else flagLink = link
textLink = link .. "|"
end
-- Text in addition to flag
if territory.args[6] == "" then
text = " " .. openBrackets .. link .. closeBrackets
elseif territory.args[6] ~= "{{{text}}}" then
text = " " .. openBrackets .. textLink .. territory.args[6] .. closeBrackets
else text = ""
end
return '[[File:' .. flagOf .. commonsName .. '.svg|' .. border .. 'link=' .. flagLink .. '|'.. size .. ']]' .. text
end
return p