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minetest.serialize: Reversible number serialization (#9722)

* minetest.serialize: Reversible number to string conversion

The %a format is not supported in Lua 5.1.
This commit also adds two tests for number serialization.
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HybridDog committed Apr 22, 2020
1 parent 4361bfc commit 5355cb1d87f60bc5548a8a9311e597b9c6046013
Showing with 14 additions and 9 deletions.
  1. +2 −9 builtin/common/serialize.lua
  2. +12 −0 builtin/common/tests/serialize_spec.lua
@@ -120,15 +120,8 @@ function core.serialize(x)
elseif tp == "function" then
return string.format("loadstring(%q)", string.dump(x))
elseif tp == "number" then
-- Serialize integers with string.format to prevent
-- scientific notation, which doesn't preserve
-- precision and breaks things like node position
-- hashes. Serialize floats normally.
if math.floor(x) == x then
return string.format("%d", x)
else
return tostring(x)
end
-- Serialize numbers reversibly with string.format
return string.format("%.17g", x)
elseif tp == "table" then
local vals = {}
local idx_dumped = {}
@@ -18,6 +18,18 @@ describe("serialize", function()
assert.same(test_in, test_out)
end)

it("handles precise numbers", function()
local test_in = 0.2695949158945771
local test_out = core.deserialize(core.serialize(test_in))
assert.same(test_in, test_out)
end)

it("handles big integers", function()
local test_in = 269594915894577
local test_out = core.deserialize(core.serialize(test_in))
assert.same(test_in, test_out)
end)

it("handles recursive structures", function()
local test_in = { hello = "world" }
test_in.foo = test_in

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