path: root/ethutil/common.go

package ethutil

import (
    "fmt"
    "math/big"
)

// The different number of units
var (
    Douglas  = BigPow(10, 42)
    Einstein = BigPow(10, 21)
    Ether    = BigPow(10, 18)
    Finney   = BigPow(10, 15)
    Szabo    = BigPow(10, 12)
    Shannon  = BigPow(10, 9)
    Babbage  = BigPow(10, 6)
    Ada      = BigPow(10, 3)
    Wei      = big.NewInt(1)
)

//
// Currency to string
// Returns a string representing a human readable format
func CurrencyToString(num *big.Int) string {
    switch {
    case num.Cmp(Douglas) >= 0:
        return fmt.Sprintf("%v Douglas", new(big.Int).Div(num, Douglas))
    case num.Cmp(Einstein) >= 0:
        return fmt.Sprintf("%v Einstein", new(big.Int).Div(num, Einstein))
    case num.Cmp(Ether) >= 0:
        return fmt.Sprintf("%v Ether", new(big.Int).Div(num, Ether))
    case num.Cmp(Finney) >= 0:
        return fmt.Sprintf("%v Finney", new(big.Int).Div(num, Finney))
    case num.Cmp(Szabo) >= 0:
        return fmt.Sprintf("%v Szabo", new(big.Int).Div(num, Szabo))
    case num.Cmp(Shannon) >= 0:
        return fmt.Sprintf("%v Shannon", new(big.Int).Div(num, Shannon))
    case num.Cmp(Babbage) >= 0:
        return fmt.Sprintf("%v Babbage", new(big.Int).Div(num, Babbage))
    case num.Cmp(Ada) >= 0:
        return fmt.Sprintf("%v Ada", new(big.Int).Div(num, Ada))
    }

    return fmt.Sprintf("%v Wei", num)
}

// Common big integers often used
var (
    Big1   = big.NewInt(1)
    Big2   = big.NewInt(2)
    Big0   = big.NewInt(0)
    Big32  = big.NewInt(32)
    Big256 = big.NewInt(0xff)
)