forked from thrasher-corp/gocryptotrader
/
pair.go
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/
pair.go
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package currency
import (
"encoding/json"
"fmt"
"strings"
)
// NewPairDelimiter splits the desired currency string at delimeter, the returns
// a Pair struct
func NewPairDelimiter(currencyPair, delimiter string) Pair {
result := strings.Split(currencyPair, delimiter)
return Pair{
Delimiter: delimiter,
Base: NewCode(result[0]),
Quote: NewCode(result[1]),
}
}
// NewPairFromStrings returns a CurrencyPair without a delimiter
func NewPairFromStrings(baseCurrency, quoteCurrency string) Pair {
return Pair{
Base: NewCode(baseCurrency),
Quote: NewCode(quoteCurrency),
}
}
// NewPair returns a currency pair from currency codes
func NewPair(baseCurrency, quoteCurrency Code) Pair {
return Pair{
Base: baseCurrency,
Quote: quoteCurrency,
}
}
// NewPairWithDelimiter returns a CurrencyPair with a delimiter
func NewPairWithDelimiter(base, quote, delimiter string) Pair {
return Pair{
Base: NewCode(base),
Quote: NewCode(quote),
Delimiter: delimiter,
}
}
// NewPairFromIndex returns a CurrencyPair via a currency string and specific
// index
func NewPairFromIndex(currencyPair, index string) (Pair, error) {
i := strings.Index(currencyPair, index)
if i == -1 {
return Pair{},
fmt.Errorf("index %s not found in currency pair string", index)
}
if i == 0 {
return NewPairFromStrings(currencyPair[0:len(index)],
currencyPair[len(index):]),
nil
}
return NewPairFromStrings(currencyPair[0:i], currencyPair[i:]), nil
}
// NewPairFromString converts currency string into a new CurrencyPair
// with or without delimeter
func NewPairFromString(currencyPair string) Pair {
delimiters := []string{"_", "-", "/", ":"}
var delimiter string
for _, x := range delimiters {
if strings.Contains(currencyPair, x) {
delimiter = x
return NewPairDelimiter(currencyPair, delimiter)
}
}
return NewPairFromStrings(currencyPair[0:3], currencyPair[3:])
}
// NewPairFromFormattedPairs matches a supplied currency pair to a list of pairs
// with a specific format. This is helpful for exchanges which
// provide currency pairs with no delimiter so we can match it with a list and
// apply the same format
func NewPairFromFormattedPairs(currencyPair string, pairs Pairs, pairFmt PairFormat) Pair {
for x := range pairs {
if strings.EqualFold(pairs[x].Format(pairFmt.Delimiter,
pairFmt.Uppercase).String(), currencyPair) {
return pairs[x]
}
}
return NewPairFromString(currencyPair)
}
// String returns a currency pair string
func (p Pair) String() string {
return p.Base.String() + p.Delimiter + p.Quote.String()
}
// Lower converts the pair object to lowercase
func (p Pair) Lower() Pair {
return Pair{
Delimiter: p.Delimiter,
Base: p.Base.Lower(),
Quote: p.Quote.Lower(),
}
}
// Upper converts the pair object to uppercase
func (p Pair) Upper() Pair {
return Pair{
Delimiter: p.Delimiter,
Base: p.Base.Upper(),
Quote: p.Quote.Upper(),
}
}
// UnmarshalJSON comforms type to the umarshaler interface
func (p *Pair) UnmarshalJSON(d []byte) error {
var pair string
err := json.Unmarshal(d, &pair)
if err != nil {
return err
}
*p = NewPairFromString(pair)
return nil
}
// MarshalJSON conforms type to the marshaler interface
func (p Pair) MarshalJSON() ([]byte, error) {
return json.Marshal(p.String())
}
// Format changes the currency based on user preferences overriding the default
// String() display
func (p Pair) Format(delimiter string, uppercase bool) Pair {
p.Delimiter = delimiter
if uppercase {
return p.Upper()
}
return p.Lower()
}
// Equal compares two currency pairs and returns whether or not they are equal
func (p Pair) Equal(cPair Pair) bool {
return strings.EqualFold(p.Base.String(), cPair.Base.String()) &&
strings.EqualFold(p.Quote.String(), cPair.Quote.String())
}
// EqualIncludeReciprocal compares two currency pairs and returns whether or not
// they are the same including reciprocal currencies.
func (p Pair) EqualIncludeReciprocal(cPair Pair) bool {
if p.Base.Item == cPair.Base.Item &&
p.Quote.Item == cPair.Quote.Item ||
p.Base.Item == cPair.Quote.Item &&
p.Quote.Item == cPair.Base.Item {
return true
}
return false
}
// IsCryptoPair checks to see if the pair is a crypto pair e.g. BTCLTC
func (p Pair) IsCryptoPair() bool {
return storage.IsCryptocurrency(p.Base) &&
storage.IsCryptocurrency(p.Quote)
}
// IsCryptoFiatPair checks to see if the pair is a crypto fiat pair e.g. BTCUSD
func (p Pair) IsCryptoFiatPair() bool {
return storage.IsCryptocurrency(p.Base) &&
storage.IsFiatCurrency(p.Quote) ||
storage.IsFiatCurrency(p.Base) &&
storage.IsCryptocurrency(p.Quote)
}
// IsFiatPair checks to see if the pair is a fiat pair e.g. EURUSD
func (p Pair) IsFiatPair() bool {
return storage.IsFiatCurrency(p.Base) && storage.IsFiatCurrency(p.Quote)
}
// IsInvalid checks invalid pair if base and quote are the same
func (p Pair) IsInvalid() bool {
return p.Base.Item == p.Quote.Item
}
// Swap turns the currency pair into its reciprocal
func (p Pair) Swap() Pair {
p.Base, p.Quote = p.Quote, p.Base
return p
}
// IsEmpty returns whether or not the pair is empty or is missing a currency
// code
func (p Pair) IsEmpty() bool {
return p.Base.IsEmpty() || p.Quote.IsEmpty()
}
// ContainsCurrency checks to see if a pair contains a specific currency
func (p Pair) ContainsCurrency(c Code) bool {
return p.Base.Item == c.Item || p.Quote.Item == c.Item
}
// Pair holds currency pair information
type Pair struct {
Delimiter string `json:"delimiter"`
Base Code `json:"base"`
Quote Code `json:"quote"`
}