Модул:language utilities

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local export = {}

-- Look up an item from the table of language data, and return it.
-- This function allows templates to access this data.
-- Returns an empty string if the item does not exist.
function export.lookup_language(frame)
    local languages = mw.loadData("Module:languages")
    
    local args = frame.args
    local lang = args[1] or error("Language code has not been specified. Please pass parameter 1 to the module invocation.")
    local langinfo = languages[lang] or error("The language code \"" .. lang .. "\" is not valid.")
    
    -- The item that the caller wanted to look up
    local itemname = args[2] or error("Type of information to look up has not been specified. Please pass parameter 2 to the module invocation.")
    local item = langinfo[itemname] or ""
    
    if type(item) == "table" then
        return item[tonumber(args[3] or 1)] or ""
    else
        return item or ""
    end
end

function export.lookup_family(frame)
    local families = mw.loadData("Module:families")
    
    local args = frame.args
    local fam = args[1] or error("Family code has not been specified. Please pass parameter 1 to the module invocation.")
    local faminfo = families[fam] or error("The family code \"" .. fam .. "\" is not valid.")
    
    -- The item that the caller wanted to look up
    local itemname = args[2] or error("Type of information to look up has not been specified. Please pass parameter 2 to the module invocation.")
    local item = faminfo[itemname] or ""
    
    if type(item) == "table" then
        return item[tonumber(args[3] or 1)] or ""
    else
        return item or ""
    end
end

function export.language_exists(frame)
    local languages = mw.loadData("Module:languages")
    
    local args = frame.args
    local lang = args[1] or error("Language code has not been specified. Please pass parameter 1 to the module invocation.")
    
    if languages[lang] then
        return "1"
    else
        return ""
    end
end

function export.family_exists(frame)
    local families = mw.loadData("Module:families")
    
    local args = frame.args
    local fam = args[1] or error("Family code has not been specified. Please pass parameter 1 to the module invocation.")
    
    if families[fam] then
        return "1"
    else
        return ""
    end
end

return export