Module:Road data/parser

local p = {} local format = string.format local gsub = mw.ustring.gsub local trim = mw.text.trim local upper = mw.ustring.upper

local prepattern = "%[(%w+)%|(.*)%|(.*)%|(.*)%]" local pattern = "%%(%w+)%%"

local function parser(formatStr, args, form) local function ifexists(name) if name == '' then return false end local title if form == 'shield' then title = mw.title.new(name, 'Media') else title = mw.title.new(name, 0) end return title.exists end local function testArgs(test, equals, ifexists, ifnot) if equals ~= '' then if args[test] == equals then return ifexists else return ifnot end else if args[test] and args[test] ~= '' then return ifexists else return ifnot end end end local formatTable = {} -- Recursively dig into tables that could be parser hooks or argument tables. local function formatStrInTable(formatStr) if type(formatStr) ~= "table" then return formatStr end formatTable = formatStr local hook = formatStr.hook local both = formatStr[2] if both then local first = formatStrInTable(formatStr[1]) local second = formatStrInTable(both) return {first, second} elseif hook then local hooksModule = require "Module:Road data/parser/hooks" local hookFunction = hooksModule[hook] or error("Hook '" .. hook .. "' does not exist", 0) return formatStrInTable(hookFunction(formatStr, args)) else local arg = args[formatStr.arg or "route"] return formatStrInTable(formatStr[arg] or formatStr.default) end end local function parse(formatStr) local preprocessed = gsub(formatStr, prepattern, testArgs) local parsedStr = gsub(preprocessed, pattern, args) local final = trim(parsedStr) if formatTable.ifexists then local exists = ifexists(final) if exists then return final else return parser(formatTable.otherwise, args, form) end end return final end formatStr = formatStrInTable(formatStr) if not formatStr or formatStr ==  then return  end if type(formatStr) == 'table' then local first = parse(formatStr[1]) local second = parse(formatStr[2]) return first, second else return parse(formatStr) end end

local function formatString(args, form) local function getTypeData(module, type) local success, moduleData = pcall(mw.loadData, module) if not success then return '' end local typeTable = moduleData[type] or moduleData[''] local defaultTable = moduleData[''] or {} if typeTable then local alias = typeTable.alias if alias then local aliasedModule = "Module:Road data/strings/" .. alias.module local aliasedType = alias.type return getTypeData(aliasedModule, aliasedType) end return typeTable[form] or defaultTable[form] or '' else return '' end end local stateCountries = {USA = true, CAN = true} local state = upper(args.state or '') local country if args.country then country = upper(args.country) else local countryModule = mw.loadData("Module:Road data/countrymask") country = countryModule[state] or 'UNK' end local typeArg = args.type local module if stateCountries[country] and state ~= '' then module = format("Module:Road data/strings/%s/%s", country, state) else module = format("Module:Road data/strings/%s", country) end return getTypeData(module, typeArg) end

function p.parser(passedArgs, form) local args = {state = passedArgs.state, type = passedArgs.type, route = passedArgs.route, denom = passedArgs.denom, county = passedArgs.county, dab = passedArgs.dab, country = passedArgs.country, township = passedArgs.township} local formatStr = formatString(args, form) if not formatStr or formatStr == '' then return nil end return parser(formatStr, args, form) end

return p