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local m = {}
local function tableLenEqual(t, len)
for key, value in pairs(t) do
len = len - 1
if len < 0 then
return false
end
end
return true
end
local function isSingleNode(ast)
if type(ast) ~= 'table' then
return false
end
local len = #ast
return len == 1 and tableLenEqual(ast, len)
end
function m.expandSingle(ast)
if isSingleNode(ast) then
return ast[1]
end
return ast
end
return m
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