Manuel Simon Hirsig
114 lines
5.1 KiB
Lua
114 lines
5.1 KiB
Lua
local type, setmetatable, setfenv, unpack, mask, _g = type, setmetatable, setfenv, unpack, bit.band, getfenv(0)
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local PRIVATE, PUBLIC, MUTABLE, PROPERTY = 0, 1, 2, 4
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local MODIFIER = {private=PRIVATE, public=PUBLIC, mutable=MUTABLE, property=PROPERTY}
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local MODIFIER_MASK, PROPERTY_MASK = {private=MUTABLE+PROPERTY, public=MUTABLE+PROPERTY, mutable=PRIVATE+PUBLIC}, PRIVATE+PUBLIC
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local error, import, define_property, lock_mt, env_mt, interface_mt, declarator_mt
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lock_mt = {}
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local _state, _modules = {}, {}
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function error(message, level, ...) _g.error(format(message, unpack(arg))..'\n'..debugstack(3, 5, 0), (level or 1) + 1) end
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function import(imports, t) for k, v in t do imports[type(k) == 'number' and v or k] = v end end
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declarator_mt = {__metatable=false}
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function define_property(self, key, t)
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local state = _state[self]
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for k, v in t do
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if k == 'get' then
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state.getters[key] = type(v) == 'function' and v or error('Getter must be function.', 3)
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elseif k == 'set' or error 'Malformed declaration.' then
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state.setters[key] = type(v) == 'function' and v or error('Setter must be function.', 3)
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end
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end
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end
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function declarator_mt.__index(self, key)
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local state, modifier = _state[self], MODIFIER[key]
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if modifier then
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state.modifiers = modifier + mask(MODIFIER_MASK[key], state.modifiers)
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return self
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elseif state.metadata[key] then
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error('Field "%s" already exists.', 2, key)
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else
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state.modifiers = PROPERTY + mask(PROPERTY_MASK, state.modifiers)
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return function(t) define_property(self, key, t) end
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end
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end
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function declarator_mt.__newindex(self, key, value)
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local state = _state[self]
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if state.metadata[key] then error('Field "%s" already exists.', 2, key) end
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state.metadata[key], state.data[key], state.modifiers = state.modifiers, value, PRIVATE
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end
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do
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local function index(access, default)
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return function(self, key)
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local state = _state[self]; local modifiers = state.metadata[key]
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if modifiers and mask(access+PROPERTY, modifiers) == access then
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return state.data[key]
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else
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local getter = state.getters[key]
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if getter then return getter() else return default[key] or error('No field "%s".', 2, key) end
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end
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end
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end
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env_mt = {__metatable=false, __index=index(PRIVATE, _g)}
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function env_mt.__newindex(self, key, value)
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local state = _state[self]; local modifiers = state.metadata[key]
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if modifiers then
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local setter = state.setters[key]
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if setter then return setter(value) end
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if mask(MUTABLE, modifiers) == 0 then error('Field "%s" is immutable.', 2, key) end
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else
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state.metadata[key] = PRIVATE
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end
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state.data[key] = value
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end
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interface_mt = {__metatable=false, __index=index(PUBLIC, {})}
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function interface_mt.__newindex(self, key, value)
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local state = _state[self]; local setter, metadata = state.setters[key], state.metadata or error('No field "%s".', 2, key)
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if mask(PUBLIC+PROPERTY, metadata) == PUBLIC+PROPERTY and setter then
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return setter(value)
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elseif mask(PUBLIC, metadata) == PUBLIC or error('Field "%s" is immutable.', 2, key) then
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state.data[key] = value
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end
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end
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end
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function _g.aux_module(name)
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if not _modules[name] then
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local state, declarator, env, interface, imports
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env, interface, declarator, imports = setmetatable({}, env_mt), setmetatable({}, interface_mt), setmetatable({}, declarator_mt), {}
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state = {
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name = name, env = env, interface = interface, declarator = declarator, imports = {}, declarator_state = PRIVATE,
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metadata = {_g=PRIVATE, _m=PRIVATE, _i=PRIVATE, import=PRIVATE, private=PROPERTY, public=PROPERTY, getter=PROPERTY, setter=PROPERTY, mutable=PROPERTY},
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data = {_g=_g, _m=env, _i=interface, import=function(t) import(imports, t) end},
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getters = {private=function() state.modifiers = PRIVATE return declarator end, public=function() state.modifiers = PUBLIC return declarator end, mutable=function() state.modifiers = MUTABLE return declarator end},
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setters = {},
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}
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_modules[name], _state[env], _state[interface], _state[declarator] = state, state, state, state
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end
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local module = _modules[name]
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setfenv(2, module.env)
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return module
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end
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local frame = CreateFrame 'Frame'
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frame:RegisterEvent 'PLAYER_LOGIN'
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frame:SetScript('OnEvent', function()
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lock_mt.__newindex = function() error 'Modules are frozen after the loading phase.' end
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local count = 0
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local t0 = GetTime()
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for _, module in _modules do
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local metadata, data, getters, setters = module.metadata, module.data, module.getters, module.setters
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for alias, name in module.imports do
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local import = _modules[name]
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if not import then error('Import failed. No module "%s".', 1, name) end
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local import_data, import_getters, import_setters = import.data, import.getters, import.setters
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if alias == '' then
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for key, modifiers in import.metadata do
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if metadata[key] then error('Import of "%s" failed. Conflict with "%s"', 1, name, key) end
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count = count + 1
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metadata[key], data[key], getters[key], setters[key] = modifiers, import_data[key], import_getters[key], import_setters[key]
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end
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else
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if metadata[alias] then error('') end
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metadata[alias], data[alias] = PRIVATE, module.interface
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end
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end
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end
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_g.aux.log('imported: '..count..' in '..(GetTime()-t0))
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end) |