Manuel Simon Hirsig
115 lines
5.5 KiB
Lua
115 lines
5.5 KiB
Lua
if module then return end
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local setfenv, getmetatable, setmetatable, type, unpack, next, _G = setfenv, getmetatable, setmetatable, type, unpack, next, getfenv(0)
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local PUBLIC, PRIVATE = 1, 2
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local CALL, INDEX, NEWINDEX = 1, 2, 3
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local inspect
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do local function print(msg) DEFAULT_CHAT_FRAME:AddMessage(RED_FONT_COLOR_CODE..msg) end
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local mt = {__metatable=false, __pow=function(self, v) self(v); return v end}
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function mt:__call(...)
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for i = 1, arg.n do
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print('arg'..i..' = '..(type(arg[i]) == 'string' and '"'..arg[i]..'"' or tostring(arg[i])))
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if type(arg[i]) == 'table' and next(arg[i]) then
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print('{')
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for k, v in arg[i] do print(' '..(type(k) == 'string' and k or '['..tostring(k)..']')..' = '..(type(v) == 'string' and '"'..v..'"' or tostring(v))) end
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print('}')
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end
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end
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return unpack(arg)
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end
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inspect = setmetatable({}, mt)
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end
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local function error(msg, ...) return _G.error(format(msg or '', unpack(arg))..'\n'..debugstack(), 0) end
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local function import_error() error('Import error.') end
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local function declaration_error() error('Declaration error.') end
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local function collision_error(key) error('"%s" already exists.', key) end
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local function nil_error(key) if key then error('"%s" is nil.', key) else error('Callee is nil') end end
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local nop = function() end
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local function prototype() local eq = function() return true end
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return setmetatable({__metatable=false, __eq=eq}, {__metatable=false, __eq=eq, __call=function(self, t) return setmetatable(t, self) end})
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end
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local INTERFACE, ENVIRONMENT, DECLARATOR = prototype(), prototype(), prototype()
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local state = {}
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function INTERFACE:__index(key) self=state[self]
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if self.access[key] == PUBLIC then return self[CALL][key] or (self[INDEX][key] or nop)() end
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end
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function INTERFACE:__newindex(key, value) self=state[self]
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if self.access[key] == PUBLIC then (self[NEWINDEX][key] or nop)(value) end
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end
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function ENVIRONMENT:__index(key) self=state[self]
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local f = self[CALL][key]; if f then return f end
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local getter = self[INDEX][key]; if getter then return getter() end
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return _G[key] or self.declarator[key]
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end
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function ENVIRONMENT:__newindex(key, value) self=state[self]
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if self.access[key] then (self[NEWINDEX][key] or collision_error(key))(value) else self.declarator[key] = value end
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end
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ENVIRONMENT.__call = nop -- TODO
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do
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local ACCESS, EVENT = {public=PUBLIC, private=PRIVATE}, {call=CALL, get=INDEX, set=NEWINDEX}
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local function declare(self, access, name, handlers)
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self.access[name] = (not self.access[name] or collision_error(name)) and access or self.default_access or declaration_error()
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for event, handler in handlers do local handler = handler
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self[event][name] = type(handler) == 'function' and handler or (event == INDEX and function() return handler end or declaration_error())
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end
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end
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function DECLARATOR:__index(key) self=state[self]; local name, access = self.declaration_name, self.declaration_access
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if ACCESS[key] and (not access or declaration_error() and not name or nil_error(name)) then
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self.declaration_access = ACCESS[key]
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elseif not name or nil_error(name) then
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self.declaration_name = (type(key) == 'string' or access and declaration_error() or nil_error(name)) and key
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end
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return self.declarator
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end
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function DECLARATOR:__newindex(key, value) self=state[self]; local name, access = self.declaration_name, self.declaration_access
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if name then declare(self, access, name, {[EVENT[key] or nil_error(name)]=value})
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elseif access or self.default_access then declare(self, access, key, {[type(value) == 'function' and CALL or INDEX]=value})
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else _G[key] = (_G[key] == nil or collision_error(key)) and value end -- G.error(nil) TODO silent error?
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self.declaration_access, self.declaration_name = nil, nil
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end
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function DECLARATOR:__call(v) self=state[self]; local name, access = self.declaration_name, self.declaration_access
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if name then
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if type(v) ~= 'table' or getmetatable(v) ~= nil then (access and declaration_error() or nil_error)(name) end
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local f, getter, setter; f, getter, setter, v.call, v.get, v.set = v.call, v.get, v.set, nil, nil, nil
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if next(v) or f ~= nil and getter ~= nil then (access and declaration_error() or nil_error)(name) end
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declare(self, access, name, {[CALL]=f, [INDEX]=getter, [NEWINDEX]=setter})
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elseif access or nil_error() then self.default_access = access end
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self.declaration_access, self.declaration_name = nil, nil
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end
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DECLARATOR.__tostring = function() return 'NIL' end
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end
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local function import(self, interface)
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local module = (interface == INTERFACE or import_error()) and state[interface]
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for k, v in module.access do
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if v == PUBLIC and not self.access[k] then
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self.access[k], self[CALL][k], self[INDEX][k], self[NEWINDEX][k] = PRIVATE, module[CALL][k], module[INDEX][k], module[NEWINDEX][k]
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end
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end
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end
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setmetatable(_G, {
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__index = function(_, key)
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if key ~= 'module' then return nil end
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local interface, environment, declarator = INTERFACE {}, ENVIRONMENT {}, DECLARATOR {}
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local self; self = {
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access = {_G=PRIVATE, I=PRIVATE, M=PRIVATE, public=PRIVATE, private=PRIVATE, import=PRIVATE, _=PRIVATE, p=PRIVATE, error=PRIVATE, nop=PRIVATE},
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[CALL] = {_G=_G, I=interface, M=environment, import=function(interface) import(self, interface) end, p=inspect, error=error, nop=nop},
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[INDEX] = {public=function() return declarator.public end, private=function() return declarator.private end},
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[NEWINDEX] = {p=inspect, _=nop},
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declarator = declarator,
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}
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state[interface], state[environment], state[declarator] = self, self, self
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setfenv(2, environment)
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return interface
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end,
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}) |