require('strict');  
local getArgs = require ('Module:Arguments').getArgs;
local lang_module = require ('Module:Lang');
local yes_no = require('Module:Yesno')  
local defined_values = {
italic = {['no']='no', ['off']='no'}, -- values accepted by |italic= and |italics=; expects 'no' so 'off' must be translated
paren = {['no']=true, ['off']=true, ['omit']=true}, -- values accepted by |paren=
}  
local messages_t = {
tag_required = 'an IETF language tag as parameter } is required', -- for
name_required = 'a name as parameter } is required',  
tag_required_idx = 'an IETF language tag in |tag%s= is required', -- for when called from
name_required_idx = 'a name in |name%s= is required',  
empty_list = 'list is empty', -- for
positional = 'positional parameters not supported',  
br_list = '&lt;br /> lists not allowed', -- for
list_markup = 'list markup expected for multiple names',
malformed_param = 'parameter value is malformed',
}  
local help_links_t = {
['native name'] = 'help',
['native name checker'] = 'help',
['native name list'] = 'help',
}  
local error_cats_t = {
['native name'] = '',
['native name checker'] = '',
['native name list'] = '',
}  
----------------------------< E R R O R _ M S G >------------------------------------------------------------  
returns a formatted error message  
local function error_msg (msg, template, index)
local cat = ((0 == mw.title.getCurrentTitle.namespace) and error_cats_t[template]) or '';
if index then
local message = string.format (msg, index);
return string.format ('<span>Error : %s (%s)</span>%s', template, message, help_links_t[template], cat)
end
return string.format ('<span>Error : %s (%s)</span>%s', template, msg, help_links_t[template], cat)
end  
--[=[-------------------------< _ N A T I V E _ N A M E >------------------------------------------------------  
implements ; entry point from a module  
<args_t> is a table of parameter name/value pairs. Parameters that are supported are:
args_t[1] - IETF language tag (required)
args_t[2] - the native name (required)
args_t.italic - accepts string values 'no' or 'off'; expects 'no' so 'off' must be translated
args_t.italics - alias of |italic=
args_t.paren - accepts 'omit', 'off', or 'no'
args_t.icon - alias of paren
args_t.parensize -
args_t.fontsize - deprecated alias of |parensize=
args_t.nolink - any value inhibits wikilinking of language name  
args_t.suppress_empty_list_error - when set to 'yes', suppresses an 'empty' error message; mostly for use within another template  
this function calls these functions in Module:lang:
_is_ietf_tag
_lang
_name_from_tag  
TODO:
add support for romanization and transliteration?
add support for postfix so that 'mis' can render something like this:  
Chotilapacquen (Coahuiltecan)  
]=]  
local function _native_name (args_t)
local template = (args_t.template and args_t.template) or 'native name'; -- for error messaging; use 'native name list' when called from native_name_list, etc  
if not (args_t[1] or args_t[2]) and yes_no (args_t.suppress_empty_list_error) then
return ''; -- if empty list error is suppressed, return empty string
elseif not args_t[1] then
return error_msg ((args_t.index and messages_t.tag_required_idx) or messages_t.tag_required, template, args_t.index)
elseif not args_t[2] then
return error_msg ((args_t.index and messages_t.name_required_idx) or messages_t.name_required, template, args_t.index)
end  
args_t.italic = args_t.italics or args_t.italic; -- plural form first in but singular form for
args_t.italic = defined_values.italic[args_t.italic] or nil; -- translate assigned value
args_t.italics = nil; -- so unset as unneeded  
args_t.paren = args_t.paren or args_t.icon;
args_t.icon = nil; -- unset as unneeded  
args_t.parensize = args_t.parensize or args_t.fontsize or '100%';
args_t.fontsize = nil; -- unset as unneeded  
if not lang_module._is_ietf_tag (args_t[1]) then
args_t[1] = lang_module._tag_from_name ({args_t[1]});
if args_t[1]:find ('Error') then
return error_msg ((args_t.index and messages_t.tag_required_idx) or messages_t.tag_required, template, args_t.index)
end
end  
local out_t = {};  
table.insert (out_t, lang_module._lang ({args_t[1], args_t[2], ['italic']=args_t.italic, ['template']=template}));
if not defined_values.paren[args_t.paren] then
table.insert (out_t, '&nbsp;');  
table.insert (out_t, table.concat ({
'<span>'}));  
if args_t.nolink then
table.insert (out_t, table.concat ({'(', lang_module._name_from_tag ({args_t[1], ['template']=template}), ')'}));
else
if lang_module._is_ietf_tag (args_t[1]) then
table.insert (out_t, table.concat ({'(', lang_module._name_from_tag ({args_t[1], ['link'] ='yes', ['template']=template}), ')'}));
else
table.insert (out_t, '(language?)'); -- TODO: any reason to keep this?
end
end  
table.insert (out_t, '</span>');
end  
return table.concat (out_t);
end  
----------------------------< N A T I V E _ N A M E >--------------------------------------------------------  
implements ; entry point from the template  
local function native_name
return _native_name (getArgs );
end  
--tag1= required)
args_t.namen - the native name (|name1= required)
args_t.italicn - accepts string values 'no' or 'off'
args_t.italicsn - alias of |italicn=
args_t.parenn - accepts 'omit', 'off', or 'no'
args_t.iconn - alias of paren
args_t.parensizen -
args_t.fontsizen - deprecated alias of |parensizen=
args_t.nolinkn - any value inhibits wikilinking of language name  
also supports:
args_t.postfixn - wikitext to be appended to list item n (references other appropriate text)
args_t.suppress_empty_list_error - when set to 'yes', suppresses an 'empty list' error message; mostly for use within another template  
local function _native_name_list (args_t)
if args_t[1] then
return error_msg (messages_t.positional, 'native name list')
end  
local unsorted_enumerators_t = {} -- unsorted k/v table of tagn and namen enumerators where k is the enumerator and v is always true  
for param, _ in pairs (args_t) do -- loop through all parameters
local enumerator = mw.ustring.match (param, "^tag(%d+)$") -- is this a |tagn= parameter? extract enumerator if present
if enumerator then -- if there is an enumerator
unsorted_enumerators_t[tonumber(enumerator)] = true -- add enumerator to the table
else
local name_match = mw.ustring.match (param, "^name(%d+)$") -- is this a |tagn= parameter? extract enumerator if present
if name_match then -- if there is an enumerator
unsorted_enumerators_t[tonumber (name_match)] = true -- add enumerator to the table
end
end
end  
local enumerators_t = {} -- will hold a sorted sequence of enumerators
for n, _ in pairs (unsorted_enumerators_t) do -- loop through the k/v table of enumerators
table.insert (enumerators_t, n) -- add the enumerator to the sequence
end
table.sort (enumerators_t) -- and ascending sort  
local list_t = {}; -- list of formatted native names goes here  
for _, n in ipairs (enumerators_t) do -- loop through the sorted enumerators
table.insert (list_t, table.concat ({
_native_name ({ -- go render the native name
args_t['tag'..n],
args_t['name'..n],
['italic'] = args_t['italic'..n],
['italics'] = args_t['italics'..n],
['paren'] = args_t['paren'..n],
['icon'] = args_t['icon'..n],
['parensize'] = args_t['parensize'..n],
['fontsize'] = args_t['fontsize'..n],
['nolink'] = args_t['nolink'..n],
['template'] = 'native name list', -- for error messaging
['index'] = n, -- for error messaging
}),
args_t['postfix'..n] or '',
}));
end  
if 0 == #list_t then
return (yes_no (args_t.suppress_empty_list_error) and '') or -- return empty string when error suppressed
error_msg (messages_t.empty_list, 'native name list'); -- otherwise error
elseif 1 == #list_t then
return list_t[1]; -- return the very short list; TODO: add error?
else
return require ('Module:List').unbulleted (list_t); -- use unbulleted list from module
end
end  
----------------------------< N A T I V E _ N A M E _ L I S T >----------------------------------------------