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add fract/trunc functions to zig RocDec

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Folkert 2024-01-29 12:44:34 +01:00
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95
crates/compiler/builtins/bitcode/src/dec.zig
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@ -340,6 +340,17 @@ pub const RocDec = extern struct {
}
}
fn trunc(self: RocDec) RocDec {
return RocDec.sub(self, self.fract());
}
fn fract(self: RocDec) RocDec {
const sign = std.math.sign(self.num);
const digits = @mod(sign * self.num, RocDec.one_point_zero.num);
return RocDec{ .num = sign * digits };
}
pub fn mul(self: RocDec, other: RocDec) RocDec {
const answer = RocDec.mulWithOverflow(self, other);
@ -1195,6 +1206,90 @@ test "log: 1" {
try expectEqual(RocDec.fromU64(0), RocDec.log(RocDec.fromU64(1)));
}
test "fract: 0" {
var roc_str = RocStr.init("0", 1);
var dec = RocDec.fromStr(roc_str).?;
try expectEqual(RocDec{ .num = 0 }, dec.fract());
}
test "fract: 1" {
var roc_str = RocStr.init("1", 1);
var dec = RocDec.fromStr(roc_str).?;
try expectEqual(RocDec{ .num = 0 }, dec.fract());
}
test "fract: 123.45" {
var roc_str = RocStr.init("123.45", 6);
var dec = RocDec.fromStr(roc_str).?;
try expectEqual(RocDec{ .num = 450000000000000000 }, dec.fract());
}
test "fract: -123.45" {
var roc_str = RocStr.init("-123.45", 7);
var dec = RocDec.fromStr(roc_str).?;
try expectEqual(RocDec{ .num = -450000000000000000 }, dec.fract());
}
test "fract: .45" {
var roc_str = RocStr.init(".45", 3);
var dec = RocDec.fromStr(roc_str).?;
try expectEqual(RocDec{ .num = 450000000000000000 }, dec.fract());
}
test "fract: -0.00045" {
const dec: RocDec = .{ .num = -450000000000000 };
const res = dec.fract();
try expectEqual(dec.num, res.num);
}
test "trunc: 0" {
var roc_str = RocStr.init("0", 1);
var dec = RocDec.fromStr(roc_str).?;
try expectEqual(RocDec{ .num = 0 }, dec.trunc());
}
test "trunc: 1" {
var roc_str = RocStr.init("1", 1);
var dec = RocDec.fromStr(roc_str).?;
try expectEqual(RocDec.one_point_zero, dec.trunc());
}
test "trunc: 123.45" {
var roc_str = RocStr.init("123.45", 6);
var dec = RocDec.fromStr(roc_str).?;
try expectEqual(RocDec{ .num = 123000000000000000000 }, dec.trunc());
}
test "trunc: -123.45" {
var roc_str = RocStr.init("-123.45", 7);
var dec = RocDec.fromStr(roc_str).?;
try expectEqual(RocDec{ .num = -123000000000000000000 }, dec.trunc());
}
test "trunc: .45" {
var roc_str = RocStr.init(".45", 3);
var dec = RocDec.fromStr(roc_str).?;
try expectEqual(RocDec{ .num = 0 }, dec.trunc());
}
test "trunc: -0.00045" {
const dec: RocDec = .{ .num = -450000000000000 };
const res = dec.trunc();
try expectEqual(RocDec{ .num = 0 }, res);
}
// exports
pub fn fromStr(arg: RocStr) callconv(.C) num_.NumParseResult(i128) {