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feat: support for number format and rounding
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| Original file line number | Diff line number | Diff line change |
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@@ -97,6 +97,7 @@ issues: | |
| - path: _test\.go | ||
| linters: | ||
| - gomnd | ||
| - funlen | ||
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| - linters: | ||
| - gomnd | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| package number | ||
|
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| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "strings" | ||
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| "github.com/shopspring/decimal" | ||
| ) | ||
|
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| func New(opt ...Option) *Options { | ||
| opts := *defaultOptions | ||
|
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| for _, o := range opt { | ||
| o.apply(&opts) | ||
| } | ||
|
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| return &opts | ||
| } | ||
|
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| // DecimalFormat produces a string form of the given decimal.Decimal in base 10 | ||
| // | ||
| // ref: https://github.com/dustin/go-humanize/blob/master/commaf.go#L13 | ||
| func DecimalFormat(d decimal.Decimal, opts *Options) (formatted string) { | ||
| defer func() { | ||
| formatted = removeNonBreakingSpace(formatted) | ||
| }() | ||
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| buf := &bytes.Buffer{} | ||
| s := d.String() | ||
| parts := strings.Split(s, ".") | ||
| if opts.decimalPlaces != nil && len(parts) > 1 && *opts.decimalPlaces < uint(len(parts[1])) { | ||
| s = d.StringFixed(int32(*opts.decimalPlaces)) | ||
| } | ||
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| if d.Sign() < 0 { | ||
| s = s[1:] | ||
| buf.WriteByte('-') | ||
| d.Abs() | ||
| } | ||
|
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| parts = strings.Split(s, ".") | ||
| buf.WriteString(formatGroup(parts[0], opts.groupSize, opts.secondaryGroupSize, opts.groupSeparator)) | ||
| if len(parts) == 1 && (opts.decimalPlaces == nil || *opts.decimalPlaces == 0) { | ||
| return buf.String() | ||
| } | ||
|
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| if opts.decimalPlaces != nil { | ||
| if len(parts) == 1 { | ||
| parts = append(parts, "") | ||
| } | ||
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| if size := *opts.decimalPlaces - uint(len(parts[1])); size > 0 { | ||
| parts[1] += fmt.Sprintf("%0*d", size, 0) | ||
| } | ||
|
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| parts[1] = parts[1][:*opts.decimalPlaces] | ||
| } | ||
|
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| buf.WriteByte(opts.decimalSeparator) | ||
| buf.WriteString(formatFraction(parts[1], opts.fractionGroupSize, opts.fractionGroupSeparator)) | ||
|
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| return strings.TrimRight(buf.String(), string(opts.fractionGroupSeparator)) | ||
| } | ||
|
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| func formatGroup(num string, groupSize, secondaryGroupSize uint, groupSeparator byte) string { | ||
| var buf = new(bytes.Buffer) | ||
| var pos uint = 0 | ||
| iLen := uint(len(num)) | ||
| if groupSize > 1 { | ||
| if groupSize < iLen { | ||
| iLen -= groupSize | ||
| if secondaryGroupSize > 0 { | ||
| groupSize = secondaryGroupSize | ||
| } | ||
|
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| if subPOS := iLen % groupSize; subPOS != 0 { | ||
| pos += subPOS | ||
| buf.WriteString(num[:pos]) | ||
| buf.WriteByte(groupSeparator) | ||
| } | ||
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| for ; pos < iLen; pos += groupSize { | ||
| buf.WriteString(num[pos : pos+groupSize]) | ||
| buf.WriteByte(groupSeparator) | ||
| } | ||
|
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| buf.WriteString(num[iLen:]) | ||
| } else { | ||
| buf.WriteString(num) | ||
| } | ||
| } | ||
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| return buf.String() | ||
| } | ||
|
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| func formatFraction(num string, fractionGroupSize uint, fractionGroupSeparator byte) string { | ||
| var buf = new(bytes.Buffer) | ||
| var pos uint = 0 | ||
| fLen := uint(len(num)) | ||
| if fractionGroupSize == 0 { | ||
| buf.WriteString(num) | ||
| return buf.String() | ||
| } | ||
|
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| lastPOS := fLen % fractionGroupSize | ||
| for ; pos < fLen-lastPOS; pos += fractionGroupSize { | ||
| buf.WriteString(num[pos : pos+fractionGroupSize]) | ||
| buf.WriteByte(fractionGroupSeparator) | ||
| } | ||
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| if lastPOS > 0 { | ||
| buf.WriteString(num[pos : pos+lastPOS]) | ||
| buf.WriteByte(fractionGroupSeparator) | ||
| } | ||
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| return buf.String() | ||
| } | ||
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| // DecimalRound sets d to its value rounded to the given precision using the given rounding mode. | ||
| // | ||
| // Returns d, which was modified in place. | ||
| func DecimalRound(d decimal.Decimal, opts *Options) (decimal.Decimal, error) { | ||
| if !opts.mode.Valid() { | ||
| return decimal.Decimal{}, ErrInvalidRM | ||
| } | ||
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| return modeHandles[opts.mode](d, opts.prec) | ||
| } |
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