Manuel Simon Hirsig
78 lines
2.5 KiB
Lua
78 lines
2.5 KiB
Lua
local DECLARED, MUTABLE, PUBLIC = 1, 2, 4
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local DECLARED_KEY, MUTABLE_KEY, PUBLIC_KEY = 'declared', 'mutable', 'public'
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local MODIFIER_VALUE = {[DECLARED_KEY]=DECLARED, [MUTABLE_KEY]=MUTABLE, [PUBLIC_KEY]=PUBLIC}
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local band, bor, bnot = bit.band, bit.bor, bit.bnot
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local _G = getfenv(0)
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local _state, _data, _metadata = {}, {}, setmetatable({}, {__index=function() return 0 end})
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--local function_mt = {
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-- __call = function(self, ...)
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-- local f = state[self]
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-- getfenv(f).__ = {}
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-- f(unpack(arg))
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-- getfenv(f).__ = temp
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-- end,
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--}
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--local method_mt = {
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-- __call = function(self, ...)
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-- local f = self[1]
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-- local temp = getfenv(f)
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-- setfenv(f, state[self])
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-- f(...)
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-- setfenv(f, temp)
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-- end,
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--}
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local environment_mt = {
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__metatable = false,
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__index = function(self, key)
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if _metadata[self][key] == 0 then return _G[key] or error('No key "'..key..'".', 2) end
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return _data[self][key]
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end,
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__newindex = function(self, key, value)
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local m = _metadata[self][key]
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if band(bor(DECLARED, MUTABLE), m) == DECLARED then error('"'..key..'" is immutable.', 2) end
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_data[self][key] = value
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_metadata[self][key] = bor(1, m)
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end,
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}
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local interface_mt = {
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__metatable = false,
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__index = function(self, key)
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if band(PUBLIC_V, _metadata[self][key]) == 0 then error('No key "'..key..'".', 2) end
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return _data[self][key]
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end,
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__newindex = function() error('Unsupported operation.', 2) end,
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}
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local modifier_mt = {
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__metatable = false,
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__call = function(self, key)
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_state[self] = MODIFIER_VALUE[key]
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end,
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__index = function(self, key)
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local value = MODIFIER_VALUE[key]
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if not value then error('Unsupported operation.', 2) end
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_state[self] = bor(_state[self], value)
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return self
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end,
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__newindex = function(self, key, value)
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if _metadata[self][key] then error('Duplicate key "'..key..'".', 2) end
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_data[self][key] = value
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_metadata[self][key] = bor(_state[self], DECLARED)
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end,
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}
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function aux_module()
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local modifier, environment, interface = setmetatable({}, modifier_mt), setmetatable({}, environment_mt), setmetatable({}, interface_mt)
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local data, metadata = {mutable=modifier, public=modifier}, {mutable=1, public=1}
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_data[modifier], _data[environment], _data[interface] = data, data, data
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_metadata[modifier], _metadata[environment], _metadata[interface] = metadata, metadata, metadata
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_state[modifier] = 1
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environment.mutable.__()
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environment.m = environment -- TODO for compatibility, remove later
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setfenv(2, environment)
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return interface
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end |