Module:Road data/parser
Documentation for this module may be created at Module:Road data/parser/doc
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
