require('Module:No globals');
local getArgs = require ('Module:Arguments').getArgs;
local override_data = mw.loadData ('Module:Language/data/ISO 639 override');
local parts = {
{'Module:Language/data/iana languages', 1},
{'Module:Language/data/ISO 639-2', 2},
{'Module:Language/data/ISO 639-3', 3},
{'Module:Language/data/ISO 639-5', 5},
}
--[[--------------------------< E R R O R _ M E S S A G E S >--------------------------------------------------
]]
local error_messages = {
['err_msg'] = '<span style="font-size:100%;" class="error show_639_err_msgs">error: $1</span>[[Category:ISO 639 name template errors]]',
['err_text'] = { -- error messages used only in the code to name functions
['ietf'] = '$1 is an IETF tag', -- $1 is the ietf tag
['required'] = 'ISO 639$1 code is required', -- $1 is the 639 '-1', '-2', '-3', '-5' part suffix; may be empty string
['not_code'] = '$1 is not an ISO 639$2 code', -- $1 is non-code input; $2 is 639 part suffix; may be empty string
-- code to name functions and iso_639_name_to_code()
['not_found'] = '$1 not found in ISO 639-$2 list', -- $1 is code or language name; $2 is 639 part suffix(es)
-- iso_639_name_to_code() only
['name'] = 'language name required',
['not_part'] = '$1 not an ISO 639 part', -- $1 is invalid 639 suffix (without hyphen)
['no_code'] = 'no code in ISO 639-$1 for $2', -- $1 is 639 part suffix; $2 is language name
['code_name'] = 'language code or name required', -- iso_639() only
}
}
--[[--------------------------< S U B S T I T U T E >----------------------------------------------------------
Populates numbered arguments in a message string using an argument table.
]]
local function substitute (msg, args)
return args and mw.message.newRawMessage (msg, args):plain() or msg;
end
--[[--------------------------< E R R O R _ M S G >------------------------------------------------------------
create an error message
]]
local function error_msg (msg, arg, hide)
return not hide and substitute (error_messages.err_msg, substitute (error_messages.err_text[msg], arg)) or '';
end
--[[--------------------------< I S _ S E T >------------------------------------------------------------------
Returns true if argument is set; false otherwise. Argument is 'set' when it exists (not nil) or when it is not an empty string.
]]
local function is_set( var )
return not (var == nil or var == '');
end
--[=[-------------------------< M A K E _ W I K I L I N K >----------------------------------------------------
Makes a wikilink; when both link and display text is provided, returns a wikilink in the form [[L|D]]; if only
link is provided, returns a wikilink in the form [[L]]; if neither are provided or link is omitted, returns an
empty string.
]=]
local function make_wikilink (link, display)
if is_set (link) then
if is_set (display) then
return table.concat ({'[[', link, '|', display, ']]'});
else
return table.concat ({'[[', link, ']]'});
end
else
return '';
end
end
--[[--------------------------< L A N G _ N A M E _ G E T >----------------------------------------------------
returns first listed language name for code from data{} table; strips parenthetical disambiguation; wikilinks to
the language article if link is true; returns nil else
]]
local function lang_name_get (code, data, link, label)
local name;
if data[code] then
name = data[code][1]:gsub ('%s*%b()', ''); -- get the name and strip parenthetical disambiguators if any
if link then -- make a link to the language article?
if name:find ('languages') then
name = make_wikilink (name, label); -- simple wikilink for collective languages unless there is a label
elseif override_data.article_name[code] then
name = make_wikilink (override_data.article_name[code][1], label or name); -- language name or label with wikilink from override data
else
name = make_wikilink (name .. ' language', label or name); -- [[name language|name]] or [[name language|label]]
end
end
return name;
end
end
--[[--------------------------< A D D _ I E T F _ E R R O R _ M S G >------------------------------------------
assembles return-text (language code, language name, or error message) with IETF error message into properly
formatted readable text
]]
local function add_ietf_error_msg (text, ietf_err, hide)
if hide then
ietf_err = '';
end
return table.concat ({
text, -- code name, language name, or error message
'' ~= ietf_err and ' ' or '', -- needs a space when ietf_err is not empty
ietf_err,}); -- tack on ietf error message if one exists
end
--[[--------------------------< G E T _ P A R T _ I N D E X >--------------------------------------------------
gets index suitable for parts{} table from ISO 639-<part> (usually args[2])
return valid index [1] - [4]; nil else
]]
local function get_part_index (part)
return ({1, 2, 3, nil, 4})[tonumber(part)];
end
--[[--------------------------< I S O _ 6 3 9 _ C O D E _ T O _ N A M E _ C O M M O N >------------------------
this is code that is common to all of the iso_639_code_n_to_name() functions which serve only as template entry points to
provide the frame, the name of the appropriate data source, and to identify which 639 part applies.
this function returns a language name or an error message.
a second retval used by _iso_639_code_to_name() is true when a code is found; nil else
]]
local function iso_639_code_to_name_common (args, source, part)
local hide = 'yes' == args['hide-err'];
if not args[1] then -- if code not provided in the template call
return error_msg ('required', '-' .. part, hide); -- abandon
end
local code; -- used for error messaging
local ietf_err; -- holds an error message when args[1] (language code) is in IETF tag form (may or may not be a valid IETF tag)
code, ietf_err = args[1]:gsub('(.-)%-.*', '%1'); -- strip ietf subtags; ietf_err is non-zero when subtags are stripped
ietf_err = (0 ~= ietf_err) and error_msg ('ietf', args[1], hide) or ''; -- when tags are stripped create an error message; empty string for concatenation else
if (1 == part and 2 ~= #code) or (1 < part and 3 ~= #code) then -- 639-1 codes are 2 characters only; all others 3 characters
return error_msg ('not_code', {code, '-' .. part}, hide);
end
local data = override_data['override_' .. part]; -- get override data for this part
local name = lang_name_get (code:lower(), data, args.link, args.label); -- get override language name if there is one
if not name then
data = mw.loadData (source); -- get the data for this ISO 639 part
name = lang_name_get (code:lower(), data, args.link, args.label); -- get language name if there is one
if not name then
return error_msg ('not_found', {code, part}, hide); -- code not found, return error message
end
end
return add_ietf_error_msg (name, ietf_err, hide), true; -- return language name with ietf error message if any; true because we found a code
end
--[[--------------------------< _ I S O _ 6 3 9 _ C O D E _ T O _ N A M E >------------------------------------
searches through the ISO 639 language tables for a name that matches the supplied code. on success returns first
language name that matches code from template frame perhaps with an error message and a second return value of true;
on failure returns an error message and a second return value of nil. The second return value is a return value
used by iso_639_code_exists()
looks first in the override data and then sequentially in the 639-1, -2, -3, and -5 data
]]
local function _iso_639_code_to_name (frame)
local args = getArgs(frame);
local hide = 'yes' == args['hide-err'];
if not args[1] then -- if code not provided in the template call
return error_msg ('required', '', hide); -- abandon
end
-- local code = args[1]; -- used in error messaging
local name; -- the retrieved language name and / or error message
local found; -- set to true when language name is found
for _, part in ipairs (parts) do
name, found = iso_639_code_to_name_common (args, part[1], part[2]);
if found then
return name, true; -- second retval for iso_639_name_exists()
end
end
return error_msg ('not_found', {args[1], '1, -2, -3, -5'}, hide); -- here when code (args[1]) is not found in the data tables
end
--[[--------------------------< I S O _ 6 3 9 _ C O D E _ T O _ N A M E >--------------------------------------
template entry point; returns first language name that matches code from template frame or an error message
looks first in the override data and then sequentially in the 639-1, -2, -3, and -5 data
]]
local function iso_639_code_to_name (frame)
local ret_val = _iso_639_code_to_name (frame); -- ignore second return value
return ret_val; -- return language name and / or error message
end
--[[--------------------------< I S O _ 6 3 9 _ C O D E _ E X I S T S >----------------------------------------
template entry point; returns true if language code maps to a language name; intended as a replacement for:
{{#exist:Template:ISO 639 name <code>|<exists>|<doesn't exist>}}
Instead of that expensive parser function call use this function:
{{#if:{{#invoke:ISO 639 name|iso_639_code_exists|<code>}}|<exists>|<doesn't exist>}}
on success, returns true; nil else
]]
local function iso_639_code_exists (frame)
local _, exists;
_, exists = _iso_639_code_to_name (frame); -- ignore name/error message return; <exists> is true when name found for code; nil else
return exists;
end
--[[--------------------------< I S O _ 6 3 9 _ C O D E _ 1 _ T O _ N A M E >----------------------------------
template entry point; returns first language name that matches ISO 639-1 code from template frame or an error message
]]
local function iso_639_code_1_to_name (frame)
local args = getArgs (frame);
local retval = iso_639_code_to_name_common (args, parts[1][1], parts[1][2]); -- suppress second return value
return retval;
end
--[[--------------------------< I S O _ 6 3 9 _ C O D E _ 2 _ T O _ N A M E >----------------------------------
template entry point; returns first language name that matches ISO 639-2 code from template frame or an error message
]]
local function iso_639_code_2_to_name (frame)
local args = getArgs (frame);
local retval = iso_639_code_to_name_common (args, parts[2][1], parts[2][2]); -- suppress second return value
return retval;
end
--[[--------------------------< I S O _ 6 3 9 _ C O D E _ 3 _ T O _ N A M E >----------------------------------
template entry point; returns first language name that matches ISO 639-3 code from template frame or an error message
]]
local function iso_639_code_3_to_name (frame)
local args = getArgs (frame);
local retval = iso_639_code_to_name_common (args, parts[3][1], parts[3][2]); -- suppress second return value
return retval;
end
--[[--------------------------< I S O _ 6 3 9 _ C O D E _ 5 _ T O _ N A M E >----------------------------------
template entry point; returns first language name that matches ISO 639-5 code from template frame or an error message
]]
local function iso_639_code_5_to_name (frame)
local args = getArgs (frame);
local retval = iso_639_code_to_name_common (args, parts[4][1], parts[4][2]); -- index [4] -> part 5 because there is no part 4; suppress second return value
return retval;
end
--[[--------------------------< _ I S O _ 6 3 9 _ N A M E _ T O _ C O D E >------------------------------------
module entry point; returns ISO 639-1, -2, -3, or -5 code associated with language name according to part (1, 2, 3, 5) argument;
when part is not provided scans 1, 2, 3 , 5 and returns first code
override data are examined first
<args> is frame arguments from getArgs(frame)
]]
local function _iso_639_name_to_code (args)
local hide = 'yes' == args['hide-err'];
if not args[1] then
return error_msg ('name', '', hide);
end
local name = args[1]; -- used in error messaging
local lc_name = name:lower(); -- holds lowercase version of name for indexing into the data table
local part_idx;
if args[2] then
part_idx = get_part_index (args[2]);
if not part_idx then
return error_msg ('not_part', args[2], hide); -- abandon; args[2] is not a valid ISO 639 part
end
end
local part = args[2];
local name_data = {};
if part then
name_data = override_data['override_' .. part]; -- select the override table for the specified part
for k, v in pairs (name_data) do -- spin through the override table for the specified part
if lc_name == v[1]:lower() then -- if name is found
return k; -- return the code
end
end
else -- part not specified
for _, part in ipairs ({'1', '2', '3', '5'}) do -- search the part in order
name_data = override_data['override_' .. part];
for k, v in pairs (name_data) do -- spin through the override table for the specified part
if lc_name == v[1]:lower() then -- if name is found
return k; -- return the code
end
end
end
end
local name_data = mw.loadData ('Module:Language/data/ISO 639 name to code'); -- ISO 639 language names to code table
if name_data[lc_name] then
if part_idx then -- if a specific part was specified
if '' == name_data[lc_name][part_idx] then -- empty string when specified part does not have code for specified language name
return error_msg ('no_code', {part, name}, hide); -- no code in ISO 639-part for language
else
return name_data[lc_name][part_idx]; -- part has code for language name
end
else
for _, v in ipairs ({1, 2, 3, 5-1}) do -- no part provided, scan through name's list of codes to get the first available code
if '' ~= name_data[lc_name][v] then -- empty string when specified part does not have code for specified language name
return name_data[lc_name][v]; -- return the first available code
end
end
end
else
return error_msg ('not_found', {name, part or '1, -2, -3, -5'}, hide);
end
end
--[[--------------------------< I S O _ 6 3 9 _ N A M E _ T O _ C O D E >--------------------------------------------------
template entry point; returns ISO 639-1, -2, -3, or -5 code associated with language name according to part (1, 2, 3, 5) argument;
when part is not provided scans 1, 2, 3 , 5 and returns first code
override data are examined first
args[1] is language name
args[2] is ISO 639 part
]]
local function iso_639_name_to_code (frame)
local args = getArgs(frame);
return _iso_639_name_to_code (args);
end
--[[--------------------------< I S O _ 6 3 9 >----------------------------------------------------------------
template entry point.
returns:
language name if args[1] is valid language code
language code if args[1] is valid language name
this function is constrained to the ISO 639 part specified in args[2] which must be 1, 2, 3, or 5. When not provided
all parts are tested. The first match is found
]]
local function iso_639 (frame)
local args = getArgs (frame);
local hide = 'yes' == args['hide-err'];
local result;
local found; -- set to true when language name is found
if not args[1] then
return error_msg ('code_name', '', hide);
end
if args[2] then -- if ISO 639 part supplied
local part_idx = get_part_index (args[2]); -- fix part 5; 1-3 same, 4 and anything else nil
if not part_idx then
return error_msg ('not_part', args[2], hide); -- abandon args[2] is not a valid ISO 639 part
end
result, found = iso_639_code_to_name_common (args, parts[part_idx][1], parts[part_idx][2]); -- attempt to find a code match
if found then
return result; -- found the code so return the language name
end
return iso_639_name_to_code (frame); -- might be a language name; return code if it is; error message or empty string else
else
for _, part in ipairs (parts) do -- for each of the iso 639 parts
result, found = iso_639_code_to_name_common (args, part[1], part[2]); -- attempt to find a code match
if found then
return result; -- found the code so return the language name
end
end
end
return iso_639_name_to_code (frame); -- might be a language name; return code if it is; error message or empty string else
end
--[[--------------------------< E X P O R T E D F U N C T I O N S >------------------------------------------
]]
return {
iso_639 = iso_639, -- returns code when given name; returns name when given code
iso_639_code_exists = iso_639_code_exists,
iso_639_code_to_name = iso_639_code_to_name,
iso_639_code_1_to_name = iso_639_code_1_to_name,
iso_639_code_2_to_name = iso_639_code_2_to_name,
iso_639_code_3_to_name = iso_639_code_3_to_name,
iso_639_code_5_to_name = iso_639_code_5_to_name,
iso_639_name_to_code = iso_639_name_to_code,
};
