path: root/common/size.go

package common

import (
    "fmt"
    "math/big"
)

type StorageSize float64

func (self StorageSize) String() string {
    if self > 1000000 {
        return fmt.Sprintf("%.2f mB", self/1000000)
    } else if self > 1000 {
        return fmt.Sprintf("%.2f kB", self/1000)
    } else {
        return fmt.Sprintf("%.2f B", self)
    }
}

// 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 {
    var (
        fin   *big.Int = num
        denom string   = "Wei"
    )

    switch {
    case num.Cmp(Douglas) >= 0:
        fin = new(big.Int).Div(num, Douglas)
        denom = "Douglas"
    case num.Cmp(Einstein) >= 0:
        fin = new(big.Int).Div(num, Einstein)
        denom = "Einstein"
    case num.Cmp(Ether) >= 0:
        fin = new(big.Int).Div(num, Ether)
        denom = "Ether"
    case num.Cmp(Finney) >= 0:
        fin = new(big.Int).Div(num, Finney)
        denom = "Finney"
    case num.Cmp(Szabo) >= 0:
        fin = new(big.Int).Div(num, Szabo)
        denom = "Szabo"
    case num.Cmp(Shannon) >= 0:
        fin = new(big.Int).Div(num, Shannon)
        denom = "Shannon"
    case num.Cmp(Babbage) >= 0:
        fin = new(big.Int).Div(num, Babbage)
        denom = "Babbage"
    case num.Cmp(Ada) >= 0:
        fin = new(big.Int).Div(num, Ada)
        denom = "Ada"
    }

    // TODO add comment clarifying expected behavior
    if len(fin.String()) > 5 {
        return fmt.Sprintf("%sE%d %s", fin.String()[0:5], len(fin.String())-5, denom)
    }

    return fmt.Sprintf("%v %s", fin, denom)
}