local p = { } -- Package to be exported
local getArgs = require('Module:Arguments').getArgs -- Import module function to work with passed arguments
local lang = mw.getContentLanguage -- Retrieve built-in locale for date formatting
local format = mw.ustring.format -- String formatting function
local = mw.getCurrentFrame  
local routeStates = { } -- Table with route statuses.
-- The following tables include the following entries:
row: The start of the row, for this particular type (color)
established: The string to be output in the "Formed" column. For future routes, "proposed" is displayed here. Otherwise, display the year passed in the established parameter.
removed: The string to be output in the "Removed" column. In the case of routeStates.former, the year that the route was decommissioned is output instead.
---
routeStates.current = {row = "|-", removed = "current"} -- Data for current routes
routeStates.future = {row = '|- title="Future route"', established = "proposed", removed = "—"} -- Data for future routes
routeStates.former = {row = '|- title="Former route"'} -- Data for former routes
routeStates.formeroverride = {row = '|- title="Former route"', removed = "—"} -- Data for routes marked as former by override
routeStates.unknown = {row = "|-", removed = "—"} -- Data for route with unknown status  
function getRouteState(established, decommissioned)
-- This function is passed the dates given for the established and decommissioned fields to the template.
It then returns the entry in the routeStates table corresponding to the status of the route.
---
if decommissioned == 'yes' then --If the decommissioned property just says "yes", then mark it as a former route and display default data.
return routeStates.formeroverride
elseif decommissioned then -- If the route is decommissioned, then it must be a former route.
return routeStates.former
elseif not established then -- Without the establishment date, there is not enough information to determine the status of the route.
return routeStates.unknown
elseif established == 'proposed' then -- If the "established date" is the string 'proposed', then it must be a future route.
return routeStates.future
else -- If of the first three conditions are true, then it must be a current route.
return routeStates.current
end
end  
function dtsYearCore(date, circa)
-- A limited replacement for . This is passed a date and derives a sort key from it. It returns a string with the hidden sort key, along with the year of the original date.
if not date then return false end -- If the date is an empty string, stop and go back to whence it came.
local year = lang:formatDate('Y', date) -- This invocation of lang:formatDate returns just the year.
if year == date then -- If the provided date is just the year:
date = date .. "-01-01" -- Tack on January 1 for the sort key to work .
end
local month = lang:formatDate('m', date) -- Stores the month of the date.
local day = lang:formatDate('d', date) -- Stores the day for this date.
local dtsStr = string.format("%05d-%02d-%02d", year, month, day) -- Create and store the formatted hidden sort key. The year must be five digits, per convention.
local spanParams = {} -- These CSS properties hide the sort key from normal view.
local dtsSpan = mw.text.tag({name='span', content=dtsStr, attrs=spanParams}) -- This generates the HTML code necessary for the hidden sort key.
if circa == 'yes' then -- If the date is tagged as circa,
return dtsSpan .. "<abbr title=\"circa\">c.</abbr><span style=\"white-space:nowrap;\">&thinsp;" .. year .. "</span>" -- Add the circa abbreviation to the display. Derived from
else -- Otherwise,
return dtsSpan .. year -- Return the hidden sort key concatenated with the year for this date.
end
end  
function dtsYear(date, circa)
local success, result = pcall(dtsYearCore, date, circa)
if success then
return result
else
return string.format('%s<span>Error: Invalid date "%s".</span>', circa and '<abbr title="circa">c.</abbr>&thinsp;' or '', date)
end
end  
function removed(routeState, decommissioned, circa)
-- This function returns the proper value for the removed column.
return routeState.removed or dtsYear(decommissioned, circa) -- Returns the removed attribute of the provided routeState table or, if empty, the dtsYear-formatted decommissioned date.
end  
function formed(routeState, established, circa)
-- This function returns the proper value for the formed column.
return routeState.established or dtsYear(established, circa) or "—" -- Returns 'proposed' if the route is proposed, the dtsYear-formatted established date if one was provided, or an em-dash.
end  
function sortkey(args)
-- This function return the sort key for the route (not to be confused with the previous function, which generates a sort key for the established and decommissioned dates.)
local key = args.sortkey
local type = args.type
local route = args.route or ''
if key then -- If a sort key already exists:
return key -- Simply return it.
else -- Otherwise:
local routeKey
local routeNum = tonumber(route)
if routeNum then
routeKey = string.format('%04d', route) -- This invocation is equivalent to the template. It zero-pads the given route number up to 4 digits.
else
local num, suffix = string.match(route, "(%d*)(.+)")
routeKey = (tonumber(num) and string.format('%04d', num) or '') .. suffix
end
return type .. routeKey -- Return the sort key for this route, composed of the type and zero-padded route number.
end
end  
function termini(args)
-- This function determines if this is a beltway or not, and displays the termini columns appropriately.
local beltway = args["beltway"] -- Text in this parameter will span both termini columns.
local terminus_a = args["terminus_a"] or '—' -- Southern or western terminus
local terminus_b = args["terminus_b"] or '—' -- Northern or eastern terminus  
if beltway then
return "|colspan=2—"
local established_ref = args.established_ref or ''  
return "||||length_km"] or '' -- Length in kilometers
local mi = args["length_mi"] or '' -- Length in miles
local ref = args["length_ref" ] or ''  
if mi == * and km == * then
return format("|align=—||align=—")
elseif mi ~= '0' and km == '' then
return format("|||mi", "km", disp = "output number only"}}
else
return format("|||km", "mi", disp = "output number only"}}
end
end  
function localname(args)
-- This function generates a "Local names" cell if necessary
local enabled = args[1] or ''
local localName = args["local"] or ''
if mw.text.trim(enabled) == "local" then
return "|" .. localName
else
return ''
end
end  
function notes(notes)
-- This function generates a "Notes" cell if necessary.
if notes == '' then
return '| ' --create empty cell
elseif notes then
return '|' .. notes --display notes in cell
else
return '' --create no cell
end
end  
function gap(args)
local text = args.text or "*Number not designated*"  
if notes then
return '|align= colspan=7|' .. text --display notes in cell
else
return '|align= colspan=6|' .. text --display notes in cell
end
end  
function route(args)
-- This function displays the shield and link.
local format = mw.ustring.format
local parserModule = require "Module:Road data/parser"
local parser = parserModule.parser  
local noshield = args.noshield
local bannerFile = parser(args, 'banner')
local banner
if not noshield and bannerFile and bannerFile ~= '' then
local widthCode = parser(args, 'width') or 'square'
if widthCode == 'square' then
banner = format("", bannerFile)
elseif widthCode == 'expand' then
local route = args.route
if #route >= 3 then
banner = format("", bannerFile)
else
banner = format("", bannerFile)
end
elseif widthCode == 'wide' then
banner = format("", bannerFile)
elseif widthCode == 'MOSupp' then
local route = args.route
if #route >= 2 then
banner = format("", bannerFile)
else
banner = format("", bannerFile)
end
elseif widthCode == 'US1926' then
banner = format("", bannerFile)
elseif args.state == 'CA' then
local route = args.route
local type = args.type
if type == 'US-Bus' then