Checking in vendor folder for ease of using go get.

vendor/golang.org/x/text/currency/currency.go

@@ -0,0 +1,185 @@
+// Copyright 2015 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.
+
+//go:generate go run gen.go gen_common.go -output tables.go
+
+// Package currency contains currency-related functionality.
+//
+// NOTE: the formatting functionality is currently under development and may
+// change without notice.
+package currency // import "golang.org/x/text/currency"
+
+import (
+	"errors"
+	"sort"
+
+	"golang.org/x/text/internal/tag"
+	"golang.org/x/text/language"
+)
+
+// TODO:
+// - language-specific currency names.
+// - currency formatting.
+// - currency information per region
+// - register currency code (there are no private use area)
+
+// TODO: remove Currency type from package language.
+
+// Kind determines the rounding and rendering properties of a currency value.
+type Kind struct {
+	rounding rounding
+	// TODO: formatting type: standard, accounting. See CLDR.
+}
+
+type rounding byte
+
+const (
+	standard rounding = iota
+	cash
+)
+
+var (
+	// Standard defines standard rounding and formatting for currencies.
+	Standard Kind = Kind{rounding: standard}
+
+	// Cash defines rounding and formatting standards for cash transactions.
+	Cash Kind = Kind{rounding: cash}
+
+	// Accounting defines rounding and formatting standards for accounting.
+	Accounting Kind = Kind{rounding: standard}
+)
+
+// Rounding reports the rounding characteristics for the given currency, where
+// scale is the number of fractional decimals and increment is the number of
+// units in terms of 10^(-scale) to which to round to.
+func (k Kind) Rounding(cur Unit) (scale, increment int) {
+	info := currency.Elem(int(cur.index))[3]
+	switch k.rounding {
+	case standard:
+		info &= roundMask
+	case cash:
+		info >>= cashShift
+	}
+	return int(roundings[info].scale), int(roundings[info].increment)
+}
+
+// Unit is an ISO 4217 currency designator.
+type Unit struct {
+	index uint16
+}
+
+// String returns the ISO code of u.
+func (u Unit) String() string {
+	if u.index == 0 {
+		return "XXX"
+	}
+	return currency.Elem(int(u.index))[:3]
+}
+
+// Amount creates an Amount for the given currency unit and amount.
+func (u Unit) Amount(amount interface{}) Amount {
+	// TODO: verify amount is a supported number type
+	return Amount{amount: amount, currency: u}
+}
+
+var (
+	errSyntax = errors.New("currency: tag is not well-formed")
+	errValue  = errors.New("currency: tag is not a recognized currency")
+)
+
+// ParseISO parses a 3-letter ISO 4217 currency code. It returns an error if s
+// is not well-formed or not a recognized currency code.
+func ParseISO(s string) (Unit, error) {
+	var buf [4]byte // Take one byte more to detect oversize keys.
+	key := buf[:copy(buf[:], s)]
+	if !tag.FixCase("XXX", key) {
+		return Unit{}, errSyntax
+	}
+	if i := currency.Index(key); i >= 0 {
+		if i == xxx {
+			return Unit{}, nil
+		}
+		return Unit{uint16(i)}, nil
+	}
+	return Unit{}, errValue
+}
+
+// MustParseISO is like ParseISO, but panics if the given currency unit
+// cannot be parsed. It simplifies safe initialization of Unit values.
+func MustParseISO(s string) Unit {
+	c, err := ParseISO(s)
+	if err != nil {
+		panic(err)
+	}
+	return c
+}
+
+// FromRegion reports the currency unit that is currently legal tender in the
+// given region according to CLDR. It will return false if region currently does
+// not have a legal tender.
+func FromRegion(r language.Region) (currency Unit, ok bool) {
+	x := regionToCode(r)
+	i := sort.Search(len(regionToCurrency), func(i int) bool {
+		return regionToCurrency[i].region >= x
+	})
+	if i < len(regionToCurrency) && regionToCurrency[i].region == x {
+		return Unit{regionToCurrency[i].code}, true
+	}
+	return Unit{}, false
+}
+
+// FromTag reports the most likely currency for the given tag. It considers the
+// currency defined in the -u extension and infers the region if necessary.
+func FromTag(t language.Tag) (Unit, language.Confidence) {
+	if cur := t.TypeForKey("cu"); len(cur) == 3 {
+		c, _ := ParseISO(cur)
+		return c, language.Exact
+	}
+	r, conf := t.Region()
+	if cur, ok := FromRegion(r); ok {
+		return cur, conf
+	}
+	return Unit{}, language.No
+}
+
+var (
+	// Undefined and testing.
+	XXX Unit = Unit{}
+	XTS Unit = Unit{xts}
+
+	// G10 currencies https://en.wikipedia.org/wiki/G10_currencies.
+	USD Unit = Unit{usd}
+	EUR Unit = Unit{eur}
+	JPY Unit = Unit{jpy}
+	GBP Unit = Unit{gbp}
+	CHF Unit = Unit{chf}
+	AUD Unit = Unit{aud}
+	NZD Unit = Unit{nzd}
+	CAD Unit = Unit{cad}
+	SEK Unit = Unit{sek}
+	NOK Unit = Unit{nok}
+
+	// Additional common currencies as defined by CLDR.
+	BRL Unit = Unit{brl}
+	CNY Unit = Unit{cny}
+	DKK Unit = Unit{dkk}
+	INR Unit = Unit{inr}
+	RUB Unit = Unit{rub}
+	HKD Unit = Unit{hkd}
+	IDR Unit = Unit{idr}
+	KRW Unit = Unit{krw}
+	MXN Unit = Unit{mxn}
+	PLN Unit = Unit{pln}
+	SAR Unit = Unit{sar}
+	THB Unit = Unit{thb}
+	TRY Unit = Unit{try}
+	TWD Unit = Unit{twd}
+	ZAR Unit = Unit{zar}
+
+	// Precious metals.
+	XAG Unit = Unit{xag}
+	XAU Unit = Unit{xau}
+	XPT Unit = Unit{xpt}
+	XPD Unit = Unit{xpd}
+)