func (d *decoder) readDecimal() decimal.Decimal {
b := d.readBytes(16)
low64 := uint64((uint64(b[0]) << 0) |
(uint64(b[1]) << 8) |
(uint64(b[2]) << 16) |
(uint64(b[3]) << 24) |
(uint64(b[4]) << 32) |
(uint64(b[5]) << 40) |
(uint64(b[6]) << 48) |
(uint64(b[7]) << 56))
high64 := uint64((uint64(b[8]) << 0) |
(uint64(b[9]) << 8) |
(uint64(b[10]) << 16) |
(uint64(b[11]) << 24) |
(uint64(b[12]) << 32) |
(uint64(b[13]) << 40) |
(uint64(b[14]) << 48) |
(uint64(b[15]) << 56))
str := Dec128ToDecimal([2]uint64{low64, high64})
dcml, _ := decimal.Parse(str)
return dcml
}
func (s *S) TestDecimalStringRoundTrip(c *C) {
ten, err := decimal.Parse("10")
c.Assert(err, IsNil)
c.Assert(ten.String(), Equals, "10")
tenth, err := decimal.Parse("0.1")
c.Assert(err, IsNil)
c.Assert(tenth.String(), Equals, "0.1")
twoTenths, err := decimal.Parse("0.2")
c.Assert(err, IsNil)
c.Assert(twoTenths.String(), Equals, "0.2")
nineTenths, err := decimal.Parse("0.9")
c.Assert(err, IsNil)
c.Assert(nineTenths.String(), Equals, "0.9")
thousandth, err := decimal.Parse("0.001")
c.Assert(err, IsNil)
c.Assert(thousandth.String(), Equals, "0.001")
exponent, err := decimal.Parse("1e-5")
c.Assert(err, IsNil)
c.Assert(exponent.String(), Equals, "0.00001")
exponent2, err := decimal.Parse("2e-50")
c.Assert(err, IsNil)
c.Assert(exponent2.String(), Equals, "0.00000000000000000000000000000000000000000000000002")
float2, err := decimal.Parse("0.00000000000000000000000000000000000000000000000002")
c.Assert(err, IsNil)
c.Assert(float2.String(), Equals, "0.00000000000000000000000000000000000000000000000002")
infinity, err := decimal.Parse("Inf")
c.Assert(err, IsNil)
c.Assert(infinity.String(), Equals, "Infinity")
ninfinity, err := decimal.Parse("-Inf")
c.Assert(err, IsNil)
c.Assert(ninfinity.String(), Equals, "-Infinity")
failure, err := decimal.Parse("I am not a number!")
c.Assert(err, ErrorMatches, "Cannot create Decimal 'I am not a number!'")
c.Assert(failure.String(), Equals, "NaN")
}
