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2,399 bytes added ,  19:38, 8 November 2018
--[[
__ __ _ _ _____ _ _ _ _
| \/ | ___ __| |_ _| | ___ _| ___|_ _| | | |__ __ _ ___| | __
| |\/| |/ _ \ / _` | | | | |/ _ (_) |_ / _` | | | '_ \ / _` |/ __| |/ /
| | | | (_) | (_| | |_| | | __/_| _| (_| | | | |_) | (_| | (__| <
|_| |_|\___/ \__,_|\__,_|_|\___(_)_| \__,_|_|_|_.__/ \__,_|\___|_|\_\

Authors and maintainers:
* User:Zolo - original version
* User:Jarekt
]]

local p = {}

--[[
translatelua

Allows easy translation or internalization of pages in Lua.

Example Usage from a template:
{{#invoke: fallback|translatelua| i18n/oil on canvas|lang={{{lang|}}}}}

Parameters:
frame.args.1 - name of translation module
frame.args.2 - field name of the structure in Module:[frame.args.1] to use
frame.args.lang - desired language (often user's native language)

Error Handling:

]]
function p.translatelua(frame)
local lang = mw.text.trim(frame.args.lang)
local page = require('Module:' .. mw.text.trim(frame.args[1])) -- page should only contain a simple of translations
if not lang or lang == '' then
lang = frame:callParserFunction("int", "lang")
end
if frame.args[2] then
page = page[mw.text.trim(frame.args[2])]
end

local langList = mw.language.getFallbacksFor(lang)
table.insert(langList,1,lang)
for _,language in ipairs(langList) do
if page[language] then
return page[language]
end
end
end

--[[
fblist

Similar to mw.language.getFallbacksFor(lang) but uses Commons old fallback chain

Parameters:
lang - desired language (often user's native language)

Error Handling:

]]
function p.fblist(lang) -- list the full fallback chain from a language to en
local fbtable = p.fallbackloop{lang:lower()}
table.insert(fbtable, 'default')
table.insert(fbtable, 'en')
return fbtable
end

local function _inArray(x, t)
for i, v in ipairs(t) do
if v == x then return i end
end
return -1
end

function p.fallbackloop(fbtable) --list of fallback languages in string format (more convenient than tables)
local langlist = require('Module:Fallbacklist')
local changes = false
for i, j in ipairs(fbtable) do
local seq = langlist[j]
if seq then
for k, l in ipairs(seq) do
if _inArray(l, fbtable) == -1 then
table.insert(fbtable, l)
changes = true
end
end
end
end
if changes then
return p.fallbackloop(fbtable)
end
return fbtable
end

return p
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