func TestRound(t *testing.T) {
tests := []struct {
val, roundOn float64
places int
want float64
}{
{1234.56, .5, 1, 1234.6},
{123.445, .5, 2, 123.45},
}
for _, test := range tests {
have := util.Round(test.val, test.roundOn, test.places)
assert.EqualValues(t, test.want, have, "%v", test)
}
}
// Swedish applies the Swedish rounding. You may set the usual options.
// TODO: Consider text/currency package based on Valuta field
func (m Money) Swedish(opts ...Option) Money {
m.Option(opts...)
const (
roundOn float64 = .5
places int = 0
)
switch m.Interval {
case Interval005:
// NL, SG, SA, CH, TR, CL, IE
// 5 cent rounding
return m.Setf(util.Round(m.Getf()*20, roundOn, places) / 20) // base 5
case Interval010:
// New Zealand & Hong Kong
// 10 cent rounding
// In Sweden between 1985 and 1992, prices were rounded up for sales
// ending in 5 öre.
return m.Setf(util.Round(m.Getf()*10, roundOn, places) / 10)
case Interval015:
// 10 cent rounding, special case
// Special case: In NZ, it is up to the business to decide if they
// will round 5¢ intervals up or down. The majority of retailers follow
// government advice and round it down.
if m.m%5 == 0 {
m.m = m.m - 1
}
return m.Setf(util.Round(m.Getf()*10, roundOn, places) / 10)
case Interval025:
// round to quarter
return m.Setf(util.Round(m.Getf()*4, roundOn, places) / 4)
case Interval050:
// 50 cent rounding
// The system used in Sweden from 1992 to 2010, in Norway from 1993 to 2012,
// and in Denmark since 1 October 2008 is the following:
// Sales ending in 1–24 öre round down to 0 öre.
// Sales ending in 25–49 öre round up to 50 öre.
// Sales ending in 51–74 öre round down to 50 öre.
// Sales ending in 75–99 öre round up to the next whole Krone/krona.
return m.Setf(util.Round(m.Getf()*2, roundOn, places) / 2)
case Interval100:
// The system used in Sweden since 30 September 2010 and used in Norway since 1 May 2012.
// Sales ending in 1–49 öre/øre round down to 0 öre/øre.
// Sales ending in 50–99 öre/øre round up to the next whole krona/krone.
return m.Setf(util.Round(m.Getf()*1, roundOn, places) / 1) // ;-)
}
return m
}
// FmtFloat64 formats a float value, does internal maybe incorrect rounding.
// Thread safe
func (no *Number) FmtFloat64(w io.Writer, f float64) (int, error) {
sign := 1
if f < 0 {
sign = -sign
}
// Special cases:
// NaN = "NaN"
// +Inf = "+Infinity"
// -Inf = "-Infinity"
if math.IsNaN(f) {
return w.Write(no.sym.Nan)
}
if f > floatMax64 {
no.mu.Lock()
defer no.mu.Unlock()
no.clearBuf()
wr := utf8.EncodeRune(no.buf, no.sym.Infinity)
return w.Write(no.buf[:wr])
}
if f < -floatMax64 {
no.mu.Lock()
defer no.mu.Unlock()
no.clearBuf()
wr := utf8.EncodeRune(no.buf, no.sym.MinusSign)
wr += utf8.EncodeRune(no.buf[wr:], no.sym.Infinity)
no.buf = no.buf[:numberBufferSize]
return w.Write(no.buf[:wr])
}
if isInt(f) { // check if float is integer value
return no.FmtInt64(w, int64(f))
}
usedFmt, err := no.GetFormat(sign < 0)
if err != nil {
if PkgLog.IsDebug() {
PkgLog.Debug("i18n.Number.FmtFloat64.GetFormat", "err", err, "format", usedFmt.String())
}
return 0, errgo.Mask(err)
}
// to test the next lines: http://play.golang.org/p/L0ykFv3G4B
precPow10 := math.Pow10(usedFmt.precision)
var modf float64
if f > 0 {
modf = f + (5 / (precPow10 * 10))
} else {
modf = f - (5 / (precPow10 * 10))
}
intgr, fracf := math.Modf(modf)
if fracf < 0 {
fracf = -fracf
}
fracI := int64(util.Round(fracf*precPow10, 0, usedFmt.precision))
return no.FmtNumber(w, sign, int64(intgr), intLen(fracI), fracI)
}
// Mul multiplies two Currency types. Both types must have the same precision.
func (m Money) Mul(d Money) Money {
// @todo c.m*d.m will overflow int64
r := util.Round(float64(m.m*d.m)/m.dpf, .5, 0)
return m.Set(int64(r))
}