模块:Utils

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local p = {}

function p.getArg(input, index)
    if not index then index = 1 end
    if type(input) == "string" then return input end
    local result = input[index] or (input.args and input.args[index]) or input:getParent().args[index] or ""
    return result
end

function p.hasChinese(str)
    return type(str) == 'string' and
               string.match(str, "[\228-\233][\128-\191][\128-\191]") ~= nil
end

function p.LazyLoad(moduleName, toLowerCase)
    toLowerCase = toLowerCase or false
    local loaded = nil

    local function doLoad()
        if loaded == nil then
            loaded = mw.loadData(moduleName)
            if toLowerCase then
                local lowerCaseLoaded = {}
                for key, value in pairs(loaded) do
                    lowerCaseLoaded[string.lower(key)] = value
                end
                loaded = lowerCaseLoaded
            end
        end
        return loaded
    end

    local meta = {}
    meta.__index = function(_table, key) return doLoad()[key] end
    meta.__pairs = function(_table) return pairs(doLoad()) end
    meta.__ipairs = function(_table) return ipairs(doLoad()) end

    local ret = {}
    setmetatable(ret, meta)
    return ret
end

function p.ExpandTemplate(title, args)
    return mw.getCurrentFrame():expandTemplate{title = title, args = args}
end

function p.fileExists(filename)
    local url = mw.getCurrentFrame():callParserFunction('filepath', filename)
    return url ~= ''
end

function p.normalizeKey(text)
    if not text then return nil end
    return text:lower():gsub("_", " ")
end

p.lazyload = p.LazyLoad
p.lazyLoad = p.LazyLoad
p.expandTemplate = p.ExpandTemplate

return p