require('strict')
return setmetatable({}, {
__index = function(t, k)
local what = mw.ustring[k]
if type(what) ~= "function" then
return what
end
return function(frame)
local fargs = frame.args
local fargsused = { tag = true }
local args = {}
local str_i = 1
while fargs['s' .. str_i] do
fargsused['s' .. str_i] = true
args[str_i] = fargs['s' .. str_i]
str_i = str_i + 1
end
for i, v in ipairs(fargs) do
fargsused[i] = true
args[i + str_i - 1] = tonumber(v) or v:gsub("^\\", "", 1)
end
if not fargs.tag then
return (what(unpack(args))) -- Outside parens truncate to first result avoiding tail call
end
local tagargs = {}
for x, y in pairs(fargs) do
if not fargsused[x] then tagargs[x] = y end
end
return frame:extensionTag{name = fargs.tag, content = what(unpack(args)), args = tagargs}
end
end
})
