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Fix math.round floating point bug (#14757)

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kromka-chleba 2024-06-24 19:57:06 +00:00 committed by GitHub
parent 157d129e30
commit 28857841aa
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2 changed files with 21 additions and 4 deletions
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11
builtin/common/misc_helpers.lua
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@ -240,12 +240,15 @@ function math.factorial(x)
return v
end
function math.round(x)
if x >= 0 then
return math.floor(x + 0.5)
if x < 0 then
local int = math.ceil(x)
local frac = x - int
return int - ((frac <= -0.5) and 1 or 0)
end
return math.ceil(x - 0.5)
local int = math.floor(x)
local frac = x - int
return int + ((frac >= 0.5) and 1 or 0)
end
local formspec_escapes = {

14
builtin/common/tests/misc_helpers_spec.lua
View File

@ -176,3 +176,17 @@ describe("formspec_escape", function()
assert.equal("\\[Hello\\\\\\[", core.formspec_escape("[Hello\\["))
end)
end)
describe("math", function()
it("round()", function()
assert.equal(0, math.round(0))
assert.equal(10, math.round(10.3))
assert.equal(11, math.round(10.5))
assert.equal(11, math.round(10.7))
assert.equal(-10, math.round(-10.3))
assert.equal(-11, math.round(-10.5))
assert.equal(-11, math.round(-10.7))
assert.equal(0, math.round(0.49999999999999994))
assert.equal(0, math.round(-0.49999999999999994))
end)
end)