--- **AceSerializer-3.0** can serialize any variable (except functions or userdata) into a string format,
-- that can be send over the addon comm channel. AceSerializer was designed to keep all data intact, especially
-- very large numbers or floating point numbers, and table structures. The only caveat currently is, that multiple
-- references to the same table will be send individually.
--
-- **AceSerializer-3.0** can be embeded into your addon, either explicitly by calling AceSerializer:Embed(MyAddon) or by
-- specifying it as an embeded library in your AceAddon. All functions will be available on your addon object
-- and can be accessed directly, without having to explicitly call AceSerializer itself.\
-- It is recommended to embed AceSerializer, otherwise you'll have to specify a custom `self` on all calls you
-- make into AceSerializer.
-- @class file
-- @name AceSerializer-3.0
-- @release $Id: AceSerializer-3.0.lua 910 2010-02-11 21:54:24Z mikk $
local MAJOR,MINOR = "AceSerializer-3.0", 3
local AceSerializer, oldminor = LibStub:NewLibrary(MAJOR, MINOR)
if not AceSerializer then return end
-- Lua APIs
local strbyte, strchar, gsub, gmatch, format = string.byte, string.char, string.gsub, string.gmatch, string.format
local assert, error, pcall = assert, error, pcall
local type, tostring, tonumber = type, tostring, tonumber
local pairs, select, frexp = pairs, select, math.frexp
local tconcat = table.concat
-- quick copies of string representations of wonky numbers
local serNaN = tostring(0)
local serInf = tostring(1)
local serNegInf = tostring(-1)
-- Serialization functions
local function SerializeStringHelper(ch) -- Used by SerializeValue for strings
-- We use 126 ("~") as an escape character for all nonprints plus a few more
local n = strbyte(ch)
if n==30 then -- v3 / ticket 115: catch a nonprint that ends up being "~^" when encoded... DOH
return "126122"
elseif n<=32 then -- nonprint + space
return "126"..strchar(n+64)
elseif n==94 then -- value separator
return "126125"
elseif n==126 then -- our own escape character
return "126124"
elseif n==127 then -- nonprint (DEL)
return "126123"
else
assert(false) -- can't be reached if caller uses a sane regex
end
end
local function SerializeValue(v, res, nres)
-- We use "^" as a value separator, followed by one byte for type indicator
local t=type(v)
if t=="string" then -- ^S = string (escaped to remove nonprints, "^"s, etc)
res[nres+1] = "^S"
res[nres+2] = gsub(v,"[%c 94126127]", SerializeStringHelper)
nres=nres+2
elseif t=="number" then -- ^N = number (just tostring()ed) or ^F (float components)
local str = tostring(v) --or str==serNaN or str==serInf or str==serNegInf
if tonumber(str)==v then
-- translates just fine, transmit as-is
res[nres+1] = "^N"
res[nres+2] = str
nres=nres+2
else
local m,e = frexp(v)
res[nres+1] = "^F"
res[nres+2] = format("%.0f",m*2^53) -- force mantissa to become integer (it's originally 0.5--0.9999)
res[nres+3] = "^f"
res[nres+4] = tostring(e-53) -- adjust exponent to counteract mantissa manipulation
nres=nres+4
end
elseif t=="table" then -- ^T...^t = table (list of key,value pairs)
nres=nres+1
res[nres] = "^T"
for k,v in pairs(v) do
nres = SerializeValue(k, res, nres)
nres = SerializeValue(v, res, nres)
end
nres=nres+1
res[nres] = "^t"
elseif t=="boolean" then -- ^B = true, ^b = false
nres=nres+1
if v then
res[nres] = "^B" -- true
else
res[nres] = "^b" -- false
end
elseif t=="nil" then -- ^Z = nil (zero, "N" was taken :P)
nres=nres+1
res[nres] = "^Z"
else
error(MAJOR..": Cannot serialize a value of type '"..t.."'") -- can't produce error on right level, this is wildly recursive
end
return nres
end
local serializeTbl = { "^1" } -- "^1" = Hi, I'm data serialized by AceSerializer protocol rev 1
--- Serialize the data passed into the function.
-- Takes a list of values (strings, numbers, booleans, nils, tables)
-- and returns it in serialized form (a string).\
-- May throw errors on invalid data types.
-- @param ... List of values to serialize
-- @return The data in its serialized form (string)
function AceSerializer:Serialize(...)
local nres = 1
for i=1,select("#", ...) do
local v = select(i, ...)
nres = SerializeValue(v, serializeTbl, nres)
end
serializeTbl[nres+1] = "^^" -- "^^" = End of serialized data
return tconcat(serializeTbl, "", 1, nres+1)
end
-- Deserialization functions
local function DeserializeStringHelper(escape)
if escape<"~122" then
return strchar(strbyte(escape,2,2)-64)
elseif escape=="~122" then -- v3 / ticket 115: special case encode since 30+64=94 ("^") - OOPS.
return " 30"
elseif escape=="~123" then
return "127"
elseif escape=="~124" then
return "126"
elseif escape=="~125" then
return "94"
end
error("DeserializeStringHelper got called for '"..escape.."'?!?") -- can't be reached unless regex is screwed up
end
local function DeserializeNumberHelper(number)
if number == serNaN then
return 0
elseif number == serNegInf then
return -1
elseif number == serInf then
return 1
else
return tonumber(number)
end
end
-- DeserializeValue: worker function for :Deserialize()
-- It works in two modes:
-- Main (top-level) mode: Deserialize a list of values and return them all
-- Recursive (table) mode: Deserialize only a single value (_may_ of course be another table with lots of subvalues in it)
--
-- The function _always_ works recursively due to having to build a list of values to return
--
-- Callers are expected to pcall(DeserializeValue) to trap errors
local function DeserializeValue(iter,single,ctl,data)
if not single then
ctl,data = iter()
end
if not ctl then
error("Supplied data misses AceSerializer terminator ('^^')")
end
if ctl=="^^" then
-- ignore extraneous data
return
end
local res
if ctl=="^S" then
res = gsub(data, "~.", DeserializeStringHelper)
elseif ctl=="^N" then
res = DeserializeNumberHelper(data)
if not res then
error("Invalid serialized number: '"..tostring(data).."'")
end
elseif ctl=="^F" then -- ^F^f
local ctl2,e = iter()
if ctl2~="^f" then
error("Invalid serialized floating-point number, expected '^f', not '"..tostring(ctl2).."'")
end
local m=tonumber(data)
e=tonumber(e)
if not (m and e) then
error("Invalid serialized floating-point number, expected mantissa and exponent, got '"..tostring(m).."' and '"..tostring(e).."'")
end
res = m*(2^e)
elseif ctl=="^B" then -- yeah yeah ignore data portion
res = true
elseif ctl=="^b" then -- yeah yeah ignore data portion
res = false
elseif ctl=="^Z" then -- yeah yeah ignore data portion
res = nil
elseif ctl=="^T" then
-- ignore ^T's data, future extensibility?
res = {}
local k,v
while true do
ctl,data = iter()
if ctl=="^t" then break end -- ignore ^t's data
k = DeserializeValue(iter,true,ctl,data)
if k==nil then
error("Invalid AceSerializer table format (no table end marker)")
end
ctl,data = iter()
v = DeserializeValue(iter,true,ctl,data)
if v==nil then
error("Invalid AceSerializer table format (no table end marker)")
end
res[k]=v
end
else
error("Invalid AceSerializer control code '"..ctl.."'")
end
if not single then
return res,DeserializeValue(iter)
else
return res
end
end
--- Deserializes the data into its original values.
-- Accepts serialized data, ignoring all control characters and whitespace.
-- @param str The serialized data (from :Serialize)
-- @return true followed by a list of values, OR false followed by an error message
function AceSerializer:Deserialize(str)
str = gsub(str, "[%c ]", "") -- ignore all control characters; nice for embedding in email and stuff
local iter = gmatch(str, "(^.)([^^]*)") -- Any ^x followed by string of non-^
local ctl,data = iter()
if not ctl or ctl~="^1" then
-- we purposefully ignore the data portion of the start code, it can be used as an extension mechanism
return false, "Supplied data is not AceSerializer data (rev 1)"
end
return pcall(DeserializeValue, iter)
end
----------------------------------------
-- Base library stuff
----------------------------------------
AceSerializer.internals = { -- for test scripts
SerializeValue = SerializeValue,
SerializeStringHelper = SerializeStringHelper,
}
local mixins = {
"Serialize",
"Deserialize",
}
AceSerializer.embeds = AceSerializer.embeds or {}
function AceSerializer:Embed(target)
for k, v in pairs(mixins) do
target[v] = self[v]
end
self.embeds[target] = true
return target
end
-- Update embeds
for target, v in pairs(AceSerializer.embeds) do
AceSerializer:Embed(target)
end
