README

universal-translator

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Universal Translator is an i18n Translator for Go/Golang using CLDR data + pluralization rules

Why another i18n library?

Because none of the plural rules seem to be correct out there, including the previous implementation of this package, so I took it upon myself to create locales for everyone to use; this package is a thin wrapper around locales in order to store and translate text for use in your applications.

Features

  • Rules generated from the CLDR data, v30.0.3
  • Contains Cardinal, Ordinal and Range Plural Rules
  • Contains Month, Weekday and Timezone translations built in
  • Contains Date & Time formatting functions
  • Contains Number, Currency, Accounting and Percent formatting functions
  • Supports the "Gregorian" calendar only ( my time isn't unlimited, had to draw the line somewhere )
  • Support loading translations from files
  • Exporting translations to file(s), mainly for getting them professionally translated
  • Code Generation for translation files -> Go code.. i.e. after it has been professionally translated
  • Tests for all languages, I need help with this, please see here

Installation

Use go get

go get github.com/go-playground/universal-translator

Usage & Documentation

Please see https://godoc.org/github.com/go-playground/universal-translator for usage docs

Examples:

File formatting

All types, Plain substitution, Cardinal, Ordinal and Range translations can all be contained withing the same file(s); they are only separated for easy viewing.

Examples:
Basic Makeup

NOTE: not all fields are needed for all translation types, see examples

{
    "locale": "en",
    "key": "days-left",
    "trans": "You have {0} day left.",
    "type": "Cardinal",
    "rule": "One",
    "override": false
}
Field Description
locale The locale for which the translation is for.
key The translation key that will be used to store and lookup each translation; normally it is a string or integer.
trans The actual translation text.
type The type of translation Cardinal, Ordinal, Range or "" for a plain substitution(not required to be defined if plain used)
rule The plural rule for which the translation is for eg. One, Two, Few, Many or Other.(not required to be defined if plain used)
override If you wish to override an existing translation that has already been registered, set this to 'true'. 99% of the time there is no need to define it.

Help With Tests

To anyone interesting in helping or contributing, I sure could use some help creating tests for each language. Please see issue here for details.

License

Distributed under MIT License, please see license file in code for more details.

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Documentation

Index

Constants

This section is empty.

Variables

var (
	// ErrUnknowTranslation indicates the translation could not be found
	ErrUnknowTranslation = errors.New("Unknown Translation")
)

Functions

This section is empty.

Types

type ErrBadParamSyntax

type ErrBadParamSyntax struct {
	// contains filtered or unexported fields
}

ErrBadParamSyntax is the error representing a bad parameter definition in a translation eg. This is a {must-be-int}

func (*ErrBadParamSyntax) Error

func (e *ErrBadParamSyntax) Error() string

Error returns ErrBadParamSyntax error message

type ErrBadPluralDefinition

type ErrBadPluralDefinition struct {
	// contains filtered or unexported fields
}

ErrBadPluralDefinition is the error representing an incorrect plural definition usually found within translations defined within files during the import process.

func (*ErrBadPluralDefinition) Error

func (e *ErrBadPluralDefinition) Error() string

Error returns ErrBadPluralDefinition's internal error text

type ErrCardinalTranslation

type ErrCardinalTranslation struct {
	// contains filtered or unexported fields
}

ErrCardinalTranslation is the error representing a cardinal translation error

func (*ErrCardinalTranslation) Error

func (e *ErrCardinalTranslation) Error() string

Error returns ErrCardinalTranslation's internal error text

type ErrConflictingTranslation

type ErrConflictingTranslation struct {
	// contains filtered or unexported fields
}

ErrConflictingTranslation is the error representing a conflicting translation

func (*ErrConflictingTranslation) Error

func (e *ErrConflictingTranslation) Error() string

Error returns ErrConflictingTranslation's internal error text

type ErrExistingTranslator

type ErrExistingTranslator struct {
	// contains filtered or unexported fields
}

ErrExistingTranslator is the error representing a conflicting translator

func (*ErrExistingTranslator) Error

func (e *ErrExistingTranslator) Error() string

Error returns ErrExistingTranslator's internal error text

type ErrMissingBracket

type ErrMissingBracket struct {
	// contains filtered or unexported fields
}

ErrMissingBracket is the error representing a missing bracket in a translation eg. This is a {0 <-- missing ending '}'

func (*ErrMissingBracket) Error

func (e *ErrMissingBracket) Error() string

Error returns ErrMissingBracket error message

type ErrMissingLocale

type ErrMissingLocale struct {
	// contains filtered or unexported fields
}

ErrMissingLocale is the error representing an expected locale that could not be found aka locale not registered with the UniversalTranslator Instance

func (*ErrMissingLocale) Error

func (e *ErrMissingLocale) Error() string

Error returns ErrMissingLocale's internal error text

type ErrMissingPluralTranslation

type ErrMissingPluralTranslation struct {
	// contains filtered or unexported fields
}

ErrMissingPluralTranslation is the error signifying a missing translation given the locales plural rules.

func (*ErrMissingPluralTranslation) Error

func (e *ErrMissingPluralTranslation) Error() string

Error returns ErrMissingPluralTranslation's internal error text

type ErrOrdinalTranslation

type ErrOrdinalTranslation struct {
	// contains filtered or unexported fields
}

ErrOrdinalTranslation is the error representing an ordinal translation error

func (*ErrOrdinalTranslation) Error

func (e *ErrOrdinalTranslation) Error() string

Error returns ErrOrdinalTranslation's internal error text

type ErrRangeTranslation

type ErrRangeTranslation struct {
	// contains filtered or unexported fields
}

ErrRangeTranslation is the error representing a range translation error

func (*ErrRangeTranslation) Error

func (e *ErrRangeTranslation) Error() string

Error returns ErrRangeTranslation's internal error text

type ImportExportFormat

type ImportExportFormat uint8

ImportExportFormat is the format of the file import or export

const (
	FormatJSON ImportExportFormat = iota
)

supported Export Formats

type Translator

type Translator interface {
	locales.Translator

	// adds a normal translation for a particular language/locale
	// {#} is the only replacement type accepted and are ad infinitum
	// eg. one: '{0} day left' other: '{0} days left'
	Add(key interface{}, text string, override bool) error

	// adds a cardinal plural translation for a particular language/locale
	// {0} is the only replacement type accepted and only one variable is accepted as
	// multiple cannot be used for a plural rule determination, unless it is a range;
	// see AddRange below.
	// eg. in locale 'en' one: '{0} day left' other: '{0} days left'
	AddCardinal(key interface{}, text string, rule locales.PluralRule, override bool) error

	// adds an ordinal plural translation for a particular language/locale
	// {0} is the only replacement type accepted and only one variable is accepted as
	// multiple cannot be used for a plural rule determination, unless it is a range;
	// see AddRange below.
	// eg. in locale 'en' one: '{0}st day of spring' other: '{0}nd day of spring'
	// - 1st, 2nd, 3rd...
	AddOrdinal(key interface{}, text string, rule locales.PluralRule, override bool) error

	// adds a range plural translation for a particular language/locale
	// {0} and {1} are the only replacement types accepted and only these are accepted.
	// eg. in locale 'nl' one: '{0}-{1} day left' other: '{0}-{1} days left'
	AddRange(key interface{}, text string, rule locales.PluralRule, override bool) error

	// creates the translation for the locale given the 'key' and params passed in
	T(key interface{}, params ...string) (string, error)

	// creates the cardinal translation for the locale given the 'key', 'num' and 'digit' arguments
	//  and param passed in
	C(key interface{}, num float64, digits uint64, param string) (string, error)

	// creates the ordinal translation for the locale given the 'key', 'num' and 'digit' arguments
	// and param passed in
	O(key interface{}, num float64, digits uint64, param string) (string, error)

	//  creates the range translation for the locale given the 'key', 'num1', 'digit1', 'num2' and
	//  'digit2' arguments and 'param1' and 'param2' passed in
	R(key interface{}, num1 float64, digits1 uint64, num2 float64, digits2 uint64, param1, param2 string) (string, error)

	// VerifyTranslations checks to ensures that no plural rules have been
	// missed within the translations.
	VerifyTranslations() error
}

Translator is universal translators translator instance which is a thin wrapper around locales.Translator instance providing some extra functionality

type UniversalTranslator

type UniversalTranslator struct {
	// contains filtered or unexported fields
}

UniversalTranslator holds all locale & translation data

func New

func New(fallback locales.Translator, supportedLocales ...locales.Translator) *UniversalTranslator

New returns a new UniversalTranslator instance set with the fallback locale and locales it should support

func (*UniversalTranslator) AddTranslator

func (t *UniversalTranslator) AddTranslator(translator locales.Translator, override bool) error

AddTranslator adds the supplied translator, if it already exists the override param will be checked and if false an error will be returned, otherwise the translator will be overridden; if the fallback matches the supplied translator it will be overridden as well NOTE: this is normally only used when translator is embedded within a library

func (*UniversalTranslator) Export

func (t *UniversalTranslator) Export(format ImportExportFormat, dirname string) error

Export writes the translations out to a file on disk.

NOTE: this currently only works with string or int translations keys.

func (*UniversalTranslator) FindTranslator

func (t *UniversalTranslator) FindTranslator(locales ...string) (trans Translator, found bool)

FindTranslator trys to find a Translator based on an array of locales and returns the first one it can find, otherwise returns the fallback translator.

func (*UniversalTranslator) GetFallback

func (t *UniversalTranslator) GetFallback() Translator

GetFallback returns the fallback locale

func (*UniversalTranslator) GetTranslator

func (t *UniversalTranslator) GetTranslator(locale string) (trans Translator, found bool)

GetTranslator returns the specified translator for the given locale, or fallback if not found

func (*UniversalTranslator) Import

func (t *UniversalTranslator) Import(format ImportExportFormat, dirnameOrFilename string) error

Import reads the translations out of a file or directory on disk.

NOTE: this currently only works with string or int translations keys.

func (*UniversalTranslator) ImportByReader

func (t *UniversalTranslator) ImportByReader(format ImportExportFormat, reader io.Reader) error

ImportByReader imports the the translations found within the contents read from the supplied reader.

NOTE: generally used when assets have been embedded into the binary and are already in memory.

func (*UniversalTranslator) VerifyTranslations

func (t *UniversalTranslator) VerifyTranslations() (err error)

VerifyTranslations runs through all locales and identifies any issues eg. missing plural rules for a locale