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294 lines
8.4 KiB
Go
294 lines
8.4 KiB
Go
package locales
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import (
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"strconv"
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"time"
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"github.com/go-playground/locales/currency"
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)
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// // ErrBadNumberValue is returned when the number passed for
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// // plural rule determination cannot be parsed
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// type ErrBadNumberValue struct {
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// NumberValue string
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// InnerError error
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// }
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// // Error returns ErrBadNumberValue error string
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// func (e *ErrBadNumberValue) Error() string {
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// return fmt.Sprintf("Invalid Number Value '%s' %s", e.NumberValue, e.InnerError)
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// }
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// var _ error = new(ErrBadNumberValue)
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// PluralRule denotes the type of plural rules
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type PluralRule int
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// PluralRule's
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const (
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PluralRuleUnknown PluralRule = iota
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PluralRuleZero // zero
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PluralRuleOne // one - singular
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PluralRuleTwo // two - dual
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PluralRuleFew // few - paucal
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PluralRuleMany // many - also used for fractions if they have a separate class
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PluralRuleOther // other - required—general plural form—also used if the language only has a single form
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)
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const (
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pluralsString = "UnknownZeroOneTwoFewManyOther"
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)
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// Translator encapsulates an instance of a locale
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// NOTE: some values are returned as a []byte just in case the caller
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// wishes to add more and can help avoid allocations; otherwise just cast as string
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type Translator interface {
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// The following Functions are for overriding, debugging or developing
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// with a Translator Locale
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// Locale returns the string value of the translator
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Locale() string
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// returns an array of cardinal plural rules associated
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// with this translator
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PluralsCardinal() []PluralRule
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// returns an array of ordinal plural rules associated
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// with this translator
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PluralsOrdinal() []PluralRule
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// returns an array of range plural rules associated
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// with this translator
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PluralsRange() []PluralRule
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// returns the cardinal PluralRule given 'num' and digits/precision of 'v' for locale
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CardinalPluralRule(num float64, v uint64) PluralRule
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// returns the ordinal PluralRule given 'num' and digits/precision of 'v' for locale
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OrdinalPluralRule(num float64, v uint64) PluralRule
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// returns the ordinal PluralRule given 'num1', 'num2' and digits/precision of 'v1' and 'v2' for locale
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RangePluralRule(num1 float64, v1 uint64, num2 float64, v2 uint64) PluralRule
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// returns the locales abbreviated month given the 'month' provided
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MonthAbbreviated(month time.Month) string
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// returns the locales abbreviated months
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MonthsAbbreviated() []string
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// returns the locales narrow month given the 'month' provided
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MonthNarrow(month time.Month) string
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// returns the locales narrow months
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MonthsNarrow() []string
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// returns the locales wide month given the 'month' provided
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MonthWide(month time.Month) string
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// returns the locales wide months
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MonthsWide() []string
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// returns the locales abbreviated weekday given the 'weekday' provided
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WeekdayAbbreviated(weekday time.Weekday) string
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// returns the locales abbreviated weekdays
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WeekdaysAbbreviated() []string
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// returns the locales narrow weekday given the 'weekday' provided
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WeekdayNarrow(weekday time.Weekday) string
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// WeekdaysNarrowreturns the locales narrow weekdays
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WeekdaysNarrow() []string
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// returns the locales short weekday given the 'weekday' provided
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WeekdayShort(weekday time.Weekday) string
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// returns the locales short weekdays
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WeekdaysShort() []string
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// returns the locales wide weekday given the 'weekday' provided
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WeekdayWide(weekday time.Weekday) string
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// returns the locales wide weekdays
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WeekdaysWide() []string
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// The following Functions are common Formatting functionsfor the Translator's Locale
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// returns 'num' with digits/precision of 'v' for locale and handles both Whole and Real numbers based on 'v'
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FmtNumber(num float64, v uint64) string
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// returns 'num' with digits/precision of 'v' for locale and handles both Whole and Real numbers based on 'v'
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// NOTE: 'num' passed into FmtPercent is assumed to be in percent already
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FmtPercent(num float64, v uint64) string
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// returns the currency representation of 'num' with digits/precision of 'v' for locale
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FmtCurrency(num float64, v uint64, currency currency.Type) string
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// returns the currency representation of 'num' with digits/precision of 'v' for locale
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// in accounting notation.
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FmtAccounting(num float64, v uint64, currency currency.Type) string
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// returns the short date representation of 't' for locale
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FmtDateShort(t time.Time) string
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// returns the medium date representation of 't' for locale
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FmtDateMedium(t time.Time) string
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// returns the long date representation of 't' for locale
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FmtDateLong(t time.Time) string
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// returns the full date representation of 't' for locale
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FmtDateFull(t time.Time) string
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// returns the short time representation of 't' for locale
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FmtTimeShort(t time.Time) string
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// returns the medium time representation of 't' for locale
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FmtTimeMedium(t time.Time) string
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// returns the long time representation of 't' for locale
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FmtTimeLong(t time.Time) string
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// returns the full time representation of 't' for locale
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FmtTimeFull(t time.Time) string
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}
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// String returns the string value of PluralRule
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func (p PluralRule) String() string {
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switch p {
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case PluralRuleZero:
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return pluralsString[7:11]
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case PluralRuleOne:
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return pluralsString[11:14]
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case PluralRuleTwo:
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return pluralsString[14:17]
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case PluralRuleFew:
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return pluralsString[17:20]
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case PluralRuleMany:
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return pluralsString[20:24]
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case PluralRuleOther:
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return pluralsString[24:]
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default:
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return pluralsString[:7]
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}
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}
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//
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// Precision Notes:
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//
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// must specify a precision >= 0, and here is why https://play.golang.org/p/LyL90U0Vyh
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//
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// v := float64(3.141)
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// i := float64(int64(v))
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//
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// fmt.Println(v - i)
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//
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// or
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//
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// s := strconv.FormatFloat(v-i, 'f', -1, 64)
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// fmt.Println(s)
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//
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// these will not print what you'd expect: 0.14100000000000001
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// and so this library requires a precision to be specified, or
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// inaccurate plural rules could be applied.
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//
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//
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//
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// n - absolute value of the source number (integer and decimals).
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// i - integer digits of n.
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// v - number of visible fraction digits in n, with trailing zeros.
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// w - number of visible fraction digits in n, without trailing zeros.
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// f - visible fractional digits in n, with trailing zeros.
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// t - visible fractional digits in n, without trailing zeros.
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//
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//
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// Func(num float64, v uint64) // v = digits/precision and prevents -1 as a special case as this can lead to very unexpected behaviour, see precision note's above.
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//
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// n := math.Abs(num)
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// i := int64(n)
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// v := v
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//
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//
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// w := strconv.FormatFloat(num-float64(i), 'f', int(v), 64) // then parse backwards on string until no more zero's....
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// f := strconv.FormatFloat(n, 'f', int(v), 64) // then turn everything after decimal into an int64
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// t := strconv.FormatFloat(n, 'f', int(v), 64) // then parse backwards on string until no more zero's....
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//
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//
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//
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// General Inclusion Rules
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// - v will always be available inherently
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// - all require n
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// - w requires i
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//
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// W returns the number of visible fraction digits in N, without trailing zeros.
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func W(n float64, v uint64) (w int64) {
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s := strconv.FormatFloat(n-float64(int64(n)), 'f', int(v), 64)
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// with either be '0' or '0.xxxx', so if 1 then w will be zero
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// otherwise need to parse
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if len(s) != 1 {
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s = s[2:]
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end := len(s) + 1
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for i := end; i >= 0; i-- {
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if s[i] != '0' {
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end = i + 1
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break
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}
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}
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w = int64(len(s[:end]))
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}
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return
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}
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// F returns the visible fractional digits in N, with trailing zeros.
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func F(n float64, v uint64) (f int64) {
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s := strconv.FormatFloat(n-float64(int64(n)), 'f', int(v), 64)
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// with either be '0' or '0.xxxx', so if 1 then f will be zero
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// otherwise need to parse
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if len(s) != 1 {
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// ignoring error, because it can't fail as we generated
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// the string internally from a real number
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f, _ = strconv.ParseInt(s[2:], 10, 64)
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}
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return
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}
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// T returns the visible fractional digits in N, without trailing zeros.
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func T(n float64, v uint64) (t int64) {
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s := strconv.FormatFloat(n-float64(int64(n)), 'f', int(v), 64)
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// with either be '0' or '0.xxxx', so if 1 then t will be zero
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// otherwise need to parse
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if len(s) != 1 {
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s = s[2:]
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end := len(s) + 1
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for i := end; i >= 0; i-- {
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if s[i] != '0' {
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end = i + 1
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break
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}
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}
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// ignoring error, because it can't fail as we generated
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// the string internally from a real number
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t, _ = strconv.ParseInt(s[:end], 10, 64)
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}
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return
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}
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