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466 lines (435 loc) · 10 KB
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local c = require "stable.raw"
local int64 = require "int64"
local assert = assert
local rawset = rawset
local rawget = rawget
local stable_get = assert(c.get)
local stable_set = assert(c.set)
local stable_settable = assert(c.settable)
local stable = {}
--[[
type info
{
type1 = { -- named struct
key1 = "typename", -- object named "typename" , it can be struct or enum
key2 = "*typename", -- object array
key3 = "*number", -- array number
key4 = "*boolean", -- array boolean
key5 = "number", -- number , default is 0
key6 = "boolean", -- boolean, default is false
key7 = "string", -- string, default is ""
key8 = "", -- string, default is ""
key9 = 1, -- number with default value
key10 = true, -- boolean with default value
key11 = { -- anonymous struct
key1 = 1,
}
key12 = { "ENUM1", "ENUM2" } -- anonymous enum
},
type2 = { -- named enum
"ENUM1",
"ENUM2",
},
}
]]
local _typeinfo -- table
local _bind -- function
local _create_node -- function
local function _next(self, key)
local next_key
if key == nil then
next_key = self.__iter[1]
else
local prev_key = self.__get[key]
next_key = self.__iter[prev_key+1]
end
if next_key then
return next_key, self[next_key]
end
end
local _array_meta
local function _bind_array(self , typename)
if typename == "*number" then
self.__type = "number"
elseif typename == "*boolean" then
self.__type = "boolean"
elseif typename == "*string" then
self.__type = "string"
elseif typename == "*userdata" then
self.__type = "userdata"
else
typename = string.sub(typename,2)
local typeinfo = assert(_typeinfo[typename],typename)
if typeinfo[1] == "enum" then
self.__type = typeinfo.id_name
self.__enum = typeinfo.name_id
else
self.__type = typename
end
end
return setmetatable(self, _array_meta)
end
local function default_node(parent_handle, typename, index)
local old = stable_get(parent_handle, index)
local sub
if old == nil then
sub = _create_node(typename)
stable_settable(parent_handle, index, sub.__handle)
elseif string.byte(typename) == 42 then -- '*'
-- It's a array
sub = {}
sub.__handle = old
_bind_array(sub, typename)
else
sub = _bind(old, _typeinfo[typename])
end
return sub
end
local function init_map(sobj, map)
for k,v in pairs(map) do
local value = rawget(sobj,k)
if value == nil then
sobj[k] = v
else
init_map(value, v)
end
end
end
local _struct_meta = {
__index = function(t,k)
local it = t.__get
local index = it[k]
assert(index, k)
local v = stable_get(t.__handle, index)
if type(v) == "userdata" then
local typename = t.__default[k]
if type(typename) ~= "string" then
-- It's a int64
return v
elseif string.byte(typename) == 42 then -- '*'
-- It's a array
local obj = {}
obj.__handle = v
_bind_array(obj, typename)
rawset(t,k,obj)
return obj
else
local obj = _bind(v, _typeinfo[typename])
rawset(t,k,obj)
return obj
end
else
local enum = it[index]
if enum then
return assert(enum[v],v)
else
return v
end
end
end,
__newindex = function(t,k,v)
local it = t.__set
local index = it[k]
local enum = it[index]
if enum then
stable_set(t.__handle, index , assert(enum[v],v))
elseif type(v) == "table" then
local sub = default_node(t.__handle, t.__default[k], index)
rawset(t, k , sub)
init_map(sub, v)
else
stable_set(t.__handle, index , v)
end
end,
__pairs = function(t)
return _next, t
end
}
local function _next_array(t,prev)
local n = stable_get(t.__handle, 's') + 1
local index = prev + 1
if index < n then
return index,t[index]
end
end
-- _array_meta is local
_array_meta = {
__index = function(t,index)
local n = stable_get(t.__handle, 's')
if index > n then
-- todo: remove resize
stable.resize(t, index)
return rawget(t,index)
end
local obj = stable_get(t.__handle, index)
if obj then
local typename = t.__type
local typeinfo = _typeinfo[typename]
if typeinfo then
obj = _bind(obj, typeinfo)
rawset(t,index,obj)
return obj
elseif type(typename) == "table" then
-- It's a enum
return assert(typename[obj],obj)
end
end
return obj
end,
__newindex = function(t,index,v)
local n = stable_get(t.__handle, 's')
if index > n then
stable.resize(t, index)
end
local enum_set = rawget(t,"__enum")
if enum_set then
stable_set(t.__handle, index, assert(enum_set[v],v))
else
local typename = type(v)
if typename == "table" then
local sub = rawget(t, index)
init_map(sub,v)
else
assert(typename == t.__type)
stable_set(t.__handle, index, v)
end
end
end,
__pairs = function(t)
return _next_array , t , 0
end,
__ipairs = function(t)
return _next_array , t , 0
end,
__len = function(t)
return stable_get(t.__handle , 's')
end,
}
-- local function
function _bind( handle, typeinfo)
local self = {}
self.__handle = handle
self.__iter = typeinfo.iter
self.__get = typeinfo.get
self.__set = typeinfo.set
self.__default = typeinfo.default
return setmetatable(self, _struct_meta)
end
local function gen_index(tbl)
local index = {}
for k in pairs(tbl) do
table.insert(index,k)
end
table.sort(index)
local ret = {}
for k,v in ipairs(index) do
ret[v] = k
end
return ret
end
local _init_typeinfo -- function
local function _init_struct(info , src)
info.iter = {}
info.get = {}
info.set = {}
info.default = {}
local anonymous = 0
local index_table = gen_index(src)
for k,v in pairs(src) do
local i = index_table[k]
info.iter[i] = k
info.get[k] = i
info.set[k] = i
local t = type(v)
if t == "table" then
-- anonymous struct or enum
local anonymous_name = "___anonymous__" .. tostring(anonymous)
local anonymous_type = {}
_typeinfo[anonymous_name] = anonymous_type
_init_typeinfo(anonymous_type , v)
if v[1] then
-- It's an enum
info.set[i] = anonymous_type.name_id
info.get[i] = anonymous_type.id_name
info.default[k] = 1
else
-- It's a struct
info.default[k] = anonymous_name
end
anonymous = anonymous + 1
elseif t == "string" then
if v == "number" then
info.default[k] = 0
elseif v == "boolean" then
info.default[k] = false
elseif v == "string" or v == "" then
info.default[k] = ""
elseif v == "userdata" then
info.default[k] = int64.new(0)
else
-- default is typename
local fc = string.byte(v)
if fc == 42 or fc == 46 then -- '*' or '.'
info.default[k] = v
else
local typeinfo = _typeinfo[v]
if typeinfo[1] == "enum" then
info.set[i] = typeinfo.name_id
info.get[i] = typeinfo.id_name
info.default[k] = 1
else
info.default[k] = v
end
end
end
else
info.default[k] = v
end
end
end
local function _init_enum(info, src)
info.name_id = {}
info.id_name = {}
for k,v in ipairs(src) do
info.name_id[v]=k
info.id_name[k]=v
end
end
-- local function defined
function _init_typeinfo(info, src)
if src[1] then
info[1] = "enum"
_init_enum(info,src)
else
info[1] = "struct"
_init_struct(info,src)
end
end
function stable.init(typeinfo)
_typeinfo = {}
for k,v in pairs(typeinfo) do
if v[1] then
_typeinfo[k] = { "enum" }
_init_enum(_typeinfo[k],v)
else
_typeinfo[k] = { "struct" }
end
end
for k,v in pairs(typeinfo) do
if _typeinfo[k][1] == "struct" then
_init_struct(_typeinfo[k],v)
end
end
return _typeinfo
end
local function _init(self, typename)
local tinfo = _typeinfo[typename]
for key,default in pairs(tinfo.default) do
local index = tinfo.get[key]
if type(default) == "string" then
if string.byte(default) == 46 then -- '.'
stable_set(self.__handle, index, string.sub(default,2))
elseif default == "" then
stable_set(self.__handle, index, default)
else
local sub = _create_node(default)
stable_settable(self.__handle, index, sub.__handle)
rawset(self, key , sub)
end
else
stable_set(self.__handle, index, default)
end
end
end
function stable.bind( handle , typename)
local self = _bind( handle , _typeinfo[typename])
local gcobj = c.grab(handle)
rawset(self, "__gc" , gcobj)
return self
end
-- create_node is local
function _create_node(typename)
local self = {}
self.__handle = c.create()
if string.byte(typename) == 42 then
-- '*' == 42 , It's a array
stable_set(self.__handle, 's' , 0)
return _bind_array(self, typename)
end
self.__iter = _typeinfo[typename].iter
self.__get = _typeinfo[typename].get
self.__set = _typeinfo[typename].set
self.__default = _typeinfo[typename].default
_init(self, typename)
return setmetatable(self, _struct_meta)
end
function stable.create(typename)
local self = _create_node( typename )
local gcobj = c.grab(self.__handle)
c.decref(self.__handle)
rawset(self,"__gc", gcobj)
return self
end
local _default_value = {
number = 0,
boolean = false,
string = "",
userdata = int64.new(0),
}
local function _reset_default(self,typename)
if string.byte(typename) == 42 then
stable.resize(self,0)
return
end
local tinfo = _typeinfo[typename]
for key,default in pairs(tinfo.default) do
local index = tinfo.get[key]
if type(default) == "string" then
if string.byte(default) == 46 then
stable_set(self.__handle, index, string.sub(default,2))
elseif default == "" then
stable_set(self.__handle, index, default)
else
_reset_default(self[key] , default)
end
else
stable_set(self.__handle, index, default)
end
end
end
function stable.resize(t,size)
local n = assert(stable_get(t.__handle,'s'))
local typename = t.__type
local default
if type(typename) == "table" then
-- enum
default = 1
else
default = _default_value[typename]
end
if size > n then
if default then
for i = n+1,size do
stable_set(t.__handle, i , default)
end
else
for i = n+1,size do
local obj = default_node(t.__handle, typename, i)
rawset(t,i,obj)
end
end
else
if default then
for i = size+1, n do
stable_set(t.__handle, i , default)
end
else
for i = size+1, n do
_reset_default(t[i], t.__type)
rawset(t,i,nil)
end
end
end
stable_set(t.__handle,'s',size)
end
return stable
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