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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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@ -120,15 +120,8 @@ function core.serialize(x)
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elseif tp == "function" then
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return string.format("loadstring(%q)", string.dump(x))
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elseif tp == "number" then
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-- Serialize integers with string.format to prevent
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-- scientific notation, which doesn't preserve
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-- precision and breaks things like node position
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-- hashes. Serialize floats normally.
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if math.floor(x) == x then
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return string.format("%d", x)
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else
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return tostring(x)
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end
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-- Serialize numbers reversibly with string.format
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return string.format("%.17g", x)
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elseif tp == "table" then
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local vals = {}
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local idx_dumped = {}
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@ -18,6 +18,18 @@ describe("serialize", function()
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assert.same(test_in, test_out)
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end)
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it("handles precise numbers", function()
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local test_in = 0.2695949158945771
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local test_out = core.deserialize(core.serialize(test_in))
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assert.same(test_in, test_out)
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end)
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it("handles big integers", function()
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local test_in = 269594915894577
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local test_out = core.deserialize(core.serialize(test_in))
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assert.same(test_in, test_out)
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end)
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it("handles recursive structures", function()
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local test_in = { hello = "world" }
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test_in.foo = test_in
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