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local rawget, rawset, setmetatable =
rawget, rawset, setmetatable
local str_lower = string.lower
local _M = {
_VERSION = '0.12',
}
-- Returns an empty headers table with internalised case normalisation.
function _M.new()
local mt = {
normalised = {},
}
mt.__index = function(t, k)
return rawget(t, mt.normalised[str_lower(k)])
end
mt.__newindex = function(t, k, v)
local k_normalised = str_lower(k)
-- First time seeing this header field?
if not mt.normalised[k_normalised] then
-- Create a lowercased entry in the metatable proxy, with the value
-- of the given field case
mt.normalised[k_normalised] = k
-- Set the header using the given field case
rawset(t, k, v)
else
-- We're being updated just with a different field case. Use the
-- normalised metatable proxy to give us the original key case, and
-- perorm a rawset() to update the value.
rawset(t, mt.normalised[k_normalised], v)
end
end
return setmetatable({}, mt)
end
return _M