func TestDecGobEncoding(t *testing.T) {
var medium bytes.Buffer
enc := gob.NewEncoder(&medium)
dec := gob.NewDecoder(&medium)
for i, test := range decGobEncodingTests {
for j := 0; j < 2; j++ {
for k := inf.Scale(-5); k <= 5; k++ {
medium.Reset() // empty buffer for each test case (in case of failures)
stest := test
if j != 0 {
// negative numbers
stest = "-" + test
}
var tx inf.Dec
tx.SetString(stest)
tx.SetScale(k) // test with positive, negative, and zero scale
if err := enc.Encode(&tx); err != nil {
t.Errorf("#%d%c: encoding failed: %s", i, 'a'+j, err)
}
var rx inf.Dec
if err := dec.Decode(&rx); err != nil {
t.Errorf("#%d%c: decoding failed: %s", i, 'a'+j, err)
}
if rx.Cmp(&tx) != 0 {
t.Errorf("#%d%c: transmission failed: got %s want %s", i, 'a'+j, &rx, &tx)
}
}
}
}
}
// ParseQuantity turns str into a Quantity, or returns an error.
func ParseQuantity(str string) (*Quantity, error) {
parts := splitRE.FindStringSubmatch(strings.TrimSpace(str))
// regexp returns are entire match, followed by an entry for each () section.
if len(parts) != 3 {
return nil, ErrFormatWrong
}
amount := new(inf.Dec)
if _, ok := amount.SetString(parts[1]); !ok {
return nil, ErrNumeric
}
base, exponent, format, ok := quantitySuffixer.interpret(suffix(parts[2]))
if !ok {
return nil, ErrSuffix
}
// So that no one but us has to think about suffixes, remove it.
if base == 10 {
amount.SetScale(amount.Scale() + inf.Scale(-exponent))
} else if base == 2 {
// numericSuffix = 2 ** exponent
numericSuffix := big.NewInt(1).Lsh(bigOne, uint(exponent))
ub := amount.UnscaledBig()
amount.SetUnscaledBig(ub.Mul(ub, numericSuffix))
}
// Cap at min/max bounds.
sign := amount.Sign()
if sign == -1 {
amount.Neg(amount)
}
// This rounds non-zero values up to the minimum representable
// value, under the theory that if you want some resources, you
// should get some resources, even if you asked for way too small
// of an amount.
// Arguably, this should be inf.RoundHalfUp (normal rounding), but
// that would have the side effect of rounding values < .5m to zero.
if v, ok := amount.Unscaled(); v != int64(0) || !ok {
amount.Round(amount, 3, inf.RoundUp)
}
// The max is just a simple cap.
if amount.Cmp(maxAllowed) > 0 {
amount.Set(maxAllowed)
}
if format == BinarySI && amount.Cmp(decOne) < 0 && amount.Cmp(decZero) > 0 {
// This avoids rounding and hopefully confusion, too.
format = DecimalSI
}
if sign == -1 {
amount.Neg(amount)
}
return &Quantity{amount, format}, nil
}
// Reset implements the protobuf marshalling interface.
func (q *Quantity) Unmarshal(data []byte) error {
p := QuantityProto{}
if err := p.Unmarshal(data); err != nil {
return err
}
q.Format = p.Format
b := big.NewInt(0)
b.SetBytes(p.Bigint)
q.Amount = inf.NewDecBig(b, inf.Scale(p.Scale))
return nil
}
func unmarshalDecimal(info TypeInfo, data []byte, value interface{}) error {
switch v := value.(type) {
case Unmarshaler:
return v.UnmarshalCQL(info, data)
case *inf.Dec:
scale := decInt(data[0:4])
unscaled := decBigInt2C(data[4:], nil)
*v = *inf.NewDecBig(unscaled, inf.Scale(scale))
return nil
}
return unmarshalErrorf("can not unmarshal %s into %T", info, value)
}
func unmarshalDecimal(info *TypeInfo, data []byte, value interface{}) error {
switch v := value.(type) {
case Unmarshaler:
return v.UnmarshalCQL(info, data)
case **inf.Dec:
if len(data) > 4 {
scale := binary.BigEndian.Uint32(data[0:4])
unscaled := new(big.Int).SetBytes(data[4:])
*v = inf.NewDecBig(unscaled, inf.Scale(scale))
}
return nil
}
return unmarshalErrorf("can not unmarshal %s into %T", info, value)
}
func unmarshalDecimal(info *TypeInfo, data []byte, value interface{}) error {
switch v := value.(type) {
case Unmarshaler:
return v.UnmarshalCQL(info, data)
case **inf.Dec:
if len(data) > 4 {
scale := decInt(data[0:4])
unscaled := decBigInt2C(data[4:])
*v = inf.NewDecBig(unscaled, inf.Scale(scale))
return nil
} else if len(data) == 0 {
*v = nil
return nil
} else {
return unmarshalErrorf("can not unmarshal %s into %T", info, value)
}
}
return unmarshalErrorf("can not unmarshal %s into %T", info, value)
}
func dec(i int64, exponent int) *inf.Dec {
// See the below test-- scale is the negative of an exponent.
return inf.NewDec(i, inf.Scale(-exponent))
}
q.Amount.SetScale(0)
q.Amount.SetUnscaled(c.Int63())
return
}
// Be sure to test cases like 1Mi
q.Amount.SetScale(0)
q.Amount.SetUnscaled(c.Int63n(1024) << uint(10*c.Intn(5)))
return
}
if c.RandBool() {
q.Format = DecimalSI
} else {
q.Format = DecimalExponent
}
if c.RandBool() {
q.Amount.SetScale(inf.Scale(c.Intn(4)))
q.Amount.SetUnscaled(c.Int63())
return
}
// Be sure to test cases like 1M
q.Amount.SetScale(inf.Scale(3 - c.Intn(15)))
q.Amount.SetUnscaled(c.Int63n(1000))
},
)
func TestJSON(t *testing.T) {
for i := 0; i < 500; i++ {
q := &Quantity{}
fuzzer.Fuzz(q)
b, err := json.Marshal(q)
if err != nil {
// infScale adapts a Scale value to an inf.Scale value.
func (s Scale) infScale() inf.Scale {
return inf.Scale(-s) // inf.Scale is upside-down
}
func dec(i int64, exponent int) *inf.Dec {
return inf.NewDec(i, inf.Scale(-exponent))
}