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util.serialization: Simpler metatable pre-processing

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It was too difficult to describe what it did.
This commit is contained in:
Kim Alvefur 2018-10-12 00:13:24 +02:00
parent 8d941e5d0f
commit e0a16c75dc
2 changed files with 20 additions and 14 deletions
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8
spec/util_serialization_spec.lua
View file

@ -44,6 +44,14 @@ describe("util.serialization", function ()
test({foo={[100]={{"bar"},{baz=1}}}});
test({["goto"] = {["function"]={["do"]="keywords"}}});
end);
it("can serialize with metatables", function ()
local s = serialization.new({ freeze = true });
local t = setmetatable({ a = "hi" }, { __freeze = function (t) return { t.a } end });
local rt = serialization.deserialize(s(t));
assert.same({"hi"}, rt);
end);
end);
end);

26
util/serialization.lua
View file

@ -139,25 +139,23 @@ local function new(opt)
end
o[t] = true;
if freeze then
if freeze == true then
-- opportunity to do pre-serialization
local mt = getmetatable(t);
local fr = (type(freeze) == "table" and freeze[mt]);
local mf = mt and mt.__freeze;
local tag;
if type(fr) == "string" then
tag = fr;
fr = mf;
elseif mt then
tag = mt.__type;
end
if type(fr) == "function" then
t = fr(t);
if type(tag) == "string" then
o[l], l = tag, l + 1;
if type(mt) == "table" then
local tag = mt.__name;
local fr = mt.__freeze;
if type(fr) == "function" then
t = fr(t);
if type(tag) == "string" then
o[l], l = tag, l + 1;
end
end
end
end
o[l], l = tstart, l + 1;
local indent = s_rep(indentwith, d);
local numkey = 1;