local lang_data = mw.loadData ('Module:Lang/data'); -- language name override and transliteration tool-tip tables local lang_name_table = lang_data.lang_name_table; -- language codes, names, regions, scripts, suppressed scripts  local lang_table = lang_name_table.lang; -- language codes, names local lang_dep_table = lang_name_table.lang_dep; -- deprecated language codes, names local override_table = lang_data.override;  local rev_lang_table = {}; -- same as lang_table reversed so language name is key and language tag is value local rev_lang_dep_table = {}; -- same as lang_dep_table reversed so language name is key and language tag is value local rev_override_table = {}; -- same as override_table except reversed local dedabbed_names_list = {}; -- holds a list of dedabbed name and tags   --[[--------------------------< R E V _ L I S T _ A D D >------------------------------------------------------  local function to add <name> (key) and <tag> (value) pair to <rev_list>  <name>/<tag> pairs where <tag> is ISO 639-1, overwrite all other <name>/<tag> pairs. When creating overrides, take care that the <name> is properly disambiguated to avoid improper masking  ]]  local function rev_list_add (rev_list, name, tag)  if rev_list[name] then -- if already in <rev_list>  if 2 == tag:len() then -- is this is a 2-characater code?  rev_list[name] = tag; -- yes, overwrite 3-characater language <name> and <tag> pair in <rev_list>  end  else -- here when not yet in <rev_list>  rev_list[name] = tag; -- add language <name> and <tag> (value) pair to <rev_list>  end end   --[[--------------------------< D E D A B B E D _ N A M E S _ L I S T _ A D D >--------------------------------  adds <name>/<tag> pairs to the dedabbed_names_list when <name> not already present. When <name> is present in the list, unsets the listed <tag> to empty string; cannot have different <name>/<tag> pairs where the table key (<name>) is shared with another <name>/<tag> pair.  ]]  local function dedabbed_names_list_add (dab, name, tag)  if 0 ~= dab then -- if dab was removed  if dedabbed_names_list[name] then -- if this dedabbed name is in the table then there are more than one name with different dabs  dedabbed_names_list[name] = ''; -- unset but not too unset  else  dedabbed_names_list[name] = tag; -- add name / tag pair in case this the only dedabbed name  end  end end   --[[--------------------------< D E D A B B E D _ T O _ R E V _ L I S T _ A D D >------------------------------  adds <name>/<tag> pairs to specified <rev_list> when <tag> is not empty string  ]]  local function dedabbed_to_rev_list_add (rev_list, name, tag)  for name, tag in pairs (dedabbed_names_list) do -- add dedabbed <name>/<tag> pairs to the reversed table  if '' ~= tag then -- when <name>/<tag> has not been unset because of multiple dabs  rev_list_add (rev_list, name, tag); -- add  end  end end   --[[--------------------------< T A G - F R O M - N A M E D A T A >------------------------------------------  Creates tag-from-name tables from the data in Module:Lang/data so that templates can get language tags from the same names as the {{lang}} templates get from those tags. The conversion prefers ISO 639-1 codes.  Data in these tables are used by tag_from_name() in Module:Lang  When <name> is disambiguated, will create an additional <name> entry without the dab as long as that action won't conflict with actual undabbed names in the source.  <name> without dab is always added to the list; this rule arises because of the three Marwari language code/name pairs:  mwr: Marwari -– not dabbed these will not have dedabbed entries because of mwr  rwr: Marwari (India)  mve: Marwari (Pakistan)  These all share the same base name so there will not not be an dedabbed entry:  ["yaka"] = "axk", -- this would be wrong for two of these languages  ["yaka (central african republic)"] = "axk",  ["yaka (congo)"] = "iyx",  ["yaka (democratic republic of congo)"] = "yaf",  Say that we find "axk". It has a dab so we add the dabbed form to rev_lang_table{}. Then we look in dedabbed_names_list{} to see if ["yaka"] is already there. It's not, so we add this:  ["yaka"] = "axk", Later we find "yaf". It has a dab so we add the dabbed form to rev_lang_table{}. Then we look in dedabbed_names_list{} to see if ["yaka"] is already there. It is, so that means that more than one language code could create an dedabbed language name key; there can be only one. Because ["yaka"] is already in the dedabbed_names_list{} table we unset the ["yaka"] entry to empty string:  ["yaka"] = '', later we find "iyx" and add it to rev_lang_table{}. We look in dedabbed_names_list{} and find ["yaka"] has been unset to empty string so do nothing.  When done adding names/codes to rev_lang_table{}, spin through dedabbed_names_list{} and add all non-empty-string name/code pairs to rev_lang_table{}.  This does not catch things like overrides ["pa"] = "Punjabi" and ["pnb"] = "Punjabi". "pa" and "pnb" are not synonyms but because the names are the same, will be treated like synonyms ("pnb" promotes to "pa"). To avoid this, disambiguate the override: ["pnb"] = {"Punjabi"} -> ["pnb"] = {"Punjabi (Western)"}  ]]  for tag, name_table in pairs (lang_table) do  if not override_table[tag] then -- only add names/tags from name_table when tag not present in override table  local name_raw = name_table[1]:lower(); -- there can be multiple names, always take the first name; may have disambiguation  local name, dab = name_raw:gsub ('%s+%b()', ''); -- remove parenthetical disambiguators or qualifiers from names that have them; <dab> non-zero when disambiguation removed   rev_list_add (rev_lang_table, name_raw, tag); -- add no-dab-names and names-with-dab here  dedabbed_names_list_add (dab, name, tag); -- add to dedabbed_names_list if dabbed  end end  dedabbed_to_rev_list_add (rev_lang_table, name, tag); -- add dedabbed name/tag pairs to the reversed table  dedabbed_names_list = {}; -- reset list of dedabbed names  for tag, name_table in pairs (lang_dep_table) do  if not override_table[tag] then -- only add names/tags from name_table when tag not present in override table  local name_raw = name_table[1]:lower(); -- there can be multiple names, always take the first name; may have disambiguation  local name, dab = name_raw:gsub ('%s+%b()', ''); -- remove parenthetical disambiguators or qualifiers from names that have them; <dab> non-zero when disambiguation removed   rev_list_add (rev_lang_dep_table, name_raw, tag); -- add no-dab-names and names-with-dab here  dedabbed_names_list_add (dab, name, tag); -- add to dedabbed_names_list if dabbed  end end  dedabbed_to_rev_list_add (rev_lang_dep_table, name, tag); -- add dedabbed name/tag pairs to the reversed table  dedabbed_names_list = {}; -- reset list of dedabbed names  for tag, name_table in pairs (override_table) do  local name_raw = name_table[1]:lower(); -- there can be multiple names, always take the first name  local name, dab = name_raw:gsub ('%s+%b()', ''); -- remove parenthetical disambiguators or qualifiers from names that have them   rev_list_add (rev_override_table, name_raw, tag);  dedabbed_names_list_add (dab, name, tag); -- add to dedabbed_names_list if dabbed end  dedabbed_to_rev_list_add (rev_override_table, name, tag); -- add dedabbed name/tag pairs to the reversed table  dedabbed_names_list = {}; -- reset list   --[[--------------------------< E X P O R T E D T A B L E S >------------------------------------------------ ]]  return {  rev_lang_table = rev_lang_table,  rev_lang_dep_table = rev_lang_dep_table,  rev_override_table = rev_override_table,  }