grokify/mogo

package currencyutil

import (
    "errors"
    "sort"
    "strings"

    "github.com/grokify/mogo/type/maputil"
)

type Currencies []Currency

func (c Currencies) Codes() []string {
    codes := []string{}
    for _, ci := range c {
        codes = append(codes, ci.Code)
    }
    sort.Strings(codes)
    return codes
}

type Currency struct {
    Code    string
    Symbol  string
    Country string
    Name    string
}

func (c *Currency) TrimSpace() {
    c.Code = strings.TrimSpace(c.Code)
    c.Symbol = strings.TrimSpace(c.Symbol)
    c.Country = strings.TrimSpace(c.Country)
    c.Name = strings.TrimSpace(c.Name)
}

type CurrencySet struct {
    Map map[string]Currency
}

var ErrNoCurrencyCode = errors.New("currency code not set")

func NewCurrencySet(c ...Currency) (CurrencySet, error) {
    set := CurrencySet{Map: map[string]Currency{}}
    err := set.Add(c...)
    return set, err
}

func (set *CurrencySet) Add(c ...Currency) error {
    for _, ci := range c {
        if strings.TrimSpace(ci.Code) == "" {
            return ErrNoCurrencyCode
        }
        set.Map[ci.Code] = ci
    }
    return nil
}

func (set CurrencySet) Codes() []string {
    return maputil.Keys(set.Map)
}