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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package number
import (
"fmt"
"golang.org/x/text/internal/number"
"golang.org/x/text/language"
)
// An Option configures a Formatter.
type Option option
type option func(tag language.Tag, f *number.Formatter)
// TODO: SpellOut requires support of the ICU RBNF format.
// func SpellOut() Option
// NoSeparator causes a number to be displayed without grouping separators.
func NoSeparator() Option {
return func(t language.Tag, f *number.Formatter) {
f.GroupingSize = [2]uint8{}
}
}
// MaxIntegerDigits limits the number of integer digits, eliminating the
// most significant digits.
func MaxIntegerDigits(max int) Option {
return func(t language.Tag, f *number.Formatter) {
if max >= 1<<8 {
max = (1 << 8) - 1
}
f.MaxIntegerDigits = uint8(max)
}
}
// MinIntegerDigits specifies the minimum number of integer digits, adding
// leading zeros when needed.
func MinIntegerDigits(min int) Option {
return func(t language.Tag, f *number.Formatter) {
if min >= 1<<8 {
min = (1 << 8) - 1
}
f.MinIntegerDigits = uint8(min)
}
}
// MaxFractionDigits specifies the maximum number of fractional digits.
func MaxFractionDigits(max int) Option {
return func(t language.Tag, f *number.Formatter) {
if max >= 1<<15 {
max = (1 << 15) - 1
}
f.MaxFractionDigits = int16(max)
}
}
// MinFractionDigits specifies the minimum number of fractional digits.
func MinFractionDigits(min int) Option {
return func(t language.Tag, f *number.Formatter) {
if min >= 1<<8 {
min = (1 << 8) - 1
}
f.MinFractionDigits = uint8(min)
}
}
// Precision sets the maximum number of significant digits. A negative value
// means exact.
func Precision(prec int) Option {
return func(t language.Tag, f *number.Formatter) {
f.SetPrecision(prec)
}
}
// Scale simultaneously sets MinFractionDigits and MaxFractionDigits to the
// given value.
func Scale(decimals int) Option {
return func(t language.Tag, f *number.Formatter) {
f.SetScale(decimals)
}
}
// IncrementString sets the incremental value to which numbers should be
// rounded. For instance: Increment("0.05") will cause 1.44 to round to 1.45.
// IncrementString also sets scale to the scale of the increment.
func IncrementString(decimal string) Option {
increment := 0
scale := 0
d := decimal
p := 0
for ; p < len(d) && '0' <= d[p] && d[p] <= '9'; p++ {
increment *= 10
increment += int(d[p]) - '0'
}
if p < len(d) && d[p] == '.' {
for p++; p < len(d) && '0' <= d[p] && d[p] <= '9'; p++ {
increment *= 10
increment += int(d[p]) - '0'
scale++
}
}
if p < len(d) {
increment = 0
scale = 0
}
return func(t language.Tag, f *number.Formatter) {
f.Increment = uint32(increment)
f.IncrementScale = uint8(scale)
f.SetScale(scale)
}
}
func noop(language.Tag, *number.Formatter) {}
// PatternOverrides allows users to specify alternative patterns for specific
// languages. The Pattern will be overridden for all languages in a subgroup as
// well. The function will panic for invalid input. It is best to create this
// option at startup time.
// PatternOverrides must be the first Option passed to a formatter.
func PatternOverrides(patterns map[string]string) Option {
// TODO: make it so that it does not have to be the first option.
// TODO: use -x-nochild to indicate it does not override child tags.
m := map[language.Tag]*number.Pattern{}
for k, v := range patterns {
tag := language.MustParse(k)
p, err := number.ParsePattern(v)
if err != nil {
panic(fmt.Errorf("number: PatternOverrides: %v", err))
}
m[tag] = p
}
return func(t language.Tag, f *number.Formatter) {
// TODO: Use language grouping relation instead of parent relation.
// TODO: Should parent implement the grouping relation?
for lang := t; ; lang = t.Parent() {
if p, ok := m[lang]; ok {
f.Pattern = *p
break
}
if lang == language.Und {
break
}
}
}
}
// FormatWidth sets the total format width.
func FormatWidth(n int) Option {
if n <= 0 {
return noop
}
return func(t language.Tag, f *number.Formatter) {
f.FormatWidth = uint16(n)
if f.PadRune == 0 {
f.PadRune = ' '
}
}
}
// Pad sets the rune to be used for filling up to the format width.
func Pad(r rune) Option {
return func(t language.Tag, f *number.Formatter) {
f.PadRune = r
}
}
// TODO:
// - FormatPosition (using type aliasing?)
// - Multiplier: find a better way to represent and figure out what to do
// with clashes with percent/permille.
// - NumberingSystem(nu string): not accessible in number.Info now. Also, should
// this be keyed by language or generic?
// - SymbolOverrides(symbols map[string]map[number.SymbolType]string) Option
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