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dec_coin.go
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dec_coin.go
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package types
import (
"fmt"
"strings"
sdk "github.com/cosmos/cosmos-sdk/types"
)
// Coins which can have additional decimal points
type DecCoin struct {
Denom string `json:"denom"`
Amount sdk.Dec `json:"amount"`
}
func NewDecCoin(denom string, amount int64) DecCoin {
return DecCoin{
Denom: denom,
Amount: sdk.NewDec(amount),
}
}
func NewDecCoinFromDec(denom string, amount sdk.Dec) DecCoin {
return DecCoin{
Denom: denom,
Amount: amount,
}
}
func NewDecCoinFromCoin(coin sdk.Coin) DecCoin {
return DecCoin{
Denom: coin.Denom,
Amount: sdk.NewDecFromInt(coin.Amount),
}
}
// Adds amounts of two coins with same denom
func (coin DecCoin) Plus(coinB DecCoin) DecCoin {
if coin.Denom != coinB.Denom {
panic(fmt.Sprintf("coin denom different: %v %v\n", coin.Denom, coinB.Denom))
}
return DecCoin{coin.Denom, coin.Amount.Add(coinB.Amount)}
}
// Subtracts amounts of two coins with same denom
func (coin DecCoin) Minus(coinB DecCoin) DecCoin {
if coin.Denom != coinB.Denom {
panic(fmt.Sprintf("coin denom different: %v %v\n", coin.Denom, coinB.Denom))
}
return DecCoin{coin.Denom, coin.Amount.Sub(coinB.Amount)}
}
// return the decimal coins with trunctated decimals, and return the change
func (coin DecCoin) TruncateDecimal() (sdk.Coin, DecCoin) {
truncated := coin.Amount.TruncateInt()
change := coin.Amount.Sub(sdk.NewDecFromInt(truncated))
return sdk.NewCoin(coin.Denom, truncated), DecCoin{coin.Denom, change}
}
//_______________________________________________________________________
// coins with decimal
type DecCoins []DecCoin
func NewDecCoins(coins sdk.Coins) DecCoins {
dcs := make(DecCoins, len(coins))
for i, coin := range coins {
dcs[i] = NewDecCoinFromCoin(coin)
}
return dcs
}
// return the coins with trunctated decimals, and return the change
func (coins DecCoins) TruncateDecimal() (sdk.Coins, DecCoins) {
changeSum := DecCoins{}
out := make(sdk.Coins, len(coins))
for i, coin := range coins {
truncated, change := coin.TruncateDecimal()
out[i] = truncated
changeSum = changeSum.Plus(DecCoins{change})
}
return out, changeSum
}
// Plus combines two sets of coins
// CONTRACT: Plus will never return Coins where one Coin has a 0 amount.
func (coins DecCoins) Plus(coinsB DecCoins) DecCoins {
sum := ([]DecCoin)(nil)
indexA, indexB := 0, 0
lenA, lenB := len(coins), len(coinsB)
for {
if indexA == lenA {
if indexB == lenB {
return sum
}
return append(sum, coinsB[indexB:]...)
} else if indexB == lenB {
return append(sum, coins[indexA:]...)
}
coinA, coinB := coins[indexA], coinsB[indexB]
switch strings.Compare(coinA.Denom, coinB.Denom) {
case -1:
sum = append(sum, coinA)
indexA++
case 0:
if coinA.Amount.Add(coinB.Amount).IsZero() {
// ignore 0 sum coin type
} else {
sum = append(sum, coinA.Plus(coinB))
}
indexA++
indexB++
case 1:
sum = append(sum, coinB)
indexB++
}
}
}
// Negative returns a set of coins with all amount negative
func (coins DecCoins) Negative() DecCoins {
res := make([]DecCoin, 0, len(coins))
for _, coin := range coins {
res = append(res, DecCoin{
Denom: coin.Denom,
Amount: coin.Amount.Neg(),
})
}
return res
}
// Minus subtracts a set of coins from another (adds the inverse)
func (coins DecCoins) Minus(coinsB DecCoins) DecCoins {
return coins.Plus(coinsB.Negative())
}
// multiply all the coins by a decimal
func (coins DecCoins) MulDec(d sdk.Dec) DecCoins {
res := make([]DecCoin, len(coins))
for i, coin := range coins {
product := DecCoin{
Denom: coin.Denom,
Amount: coin.Amount.Mul(d),
}
res[i] = product
}
return res
}
// divide all the coins by a decimal
func (coins DecCoins) QuoDec(d sdk.Dec) DecCoins {
res := make([]DecCoin, len(coins))
for i, coin := range coins {
quotient := DecCoin{
Denom: coin.Denom,
Amount: coin.Amount.Quo(d),
}
res[i] = quotient
}
return res
}
// returns the amount of a denom from deccoins
func (coins DecCoins) AmountOf(denom string) sdk.Dec {
switch len(coins) {
case 0:
return sdk.ZeroDec()
case 1:
coin := coins[0]
if coin.Denom == denom {
return coin.Amount
}
return sdk.ZeroDec()
default:
midIdx := len(coins) / 2 // binary search
coin := coins[midIdx]
if denom < coin.Denom {
return coins[:midIdx].AmountOf(denom)
} else if denom == coin.Denom {
return coin.Amount
} else {
return coins[midIdx+1:].AmountOf(denom)
}
}
}
// has a negative DecCoin amount
func (coins DecCoins) HasNegative() bool {
for _, coin := range coins {
if coin.Amount.IsNegative() {
return true
}
}
return false
}
// return whether all coins are zero
func (coins DecCoins) IsZero() bool {
for _, coin := range coins {
if !coin.Amount.IsZero() {
return false
}
}
return true
}