37 lines
1.1 KiB
TypeScript
37 lines
1.1 KiB
TypeScript
import { PublicKey } from '@solana/web3.js'
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import BN from 'bn.js'
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import { MintAccount, TokenAccount } from './tokens'
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function fixedPointToNumber(value: BN, decimals: number) {
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const divisor = new BN(10).pow(new BN(decimals))
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const quotient = value.div(divisor)
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const remainder = value.mod(divisor)
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return quotient.toNumber() + remainder.toNumber() / divisor.toNumber()
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}
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export function calculateBalance(
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mints: { [pk: string]: MintAccount },
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account: TokenAccount
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): number {
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const mint = mints[account.mint.toBase58()]
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return mint ? fixedPointToNumber(account.amount, mint.decimals) : 0
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}
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export function calculateSupply(
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mints: { [pk: string]: MintAccount },
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pk: PublicKey
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): number | undefined {
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const mint = mints[pk.toBase58()]
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return mint && fixedPointToNumber(mint.supply, mint.decimals)
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}
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export function calculateNativeAmountUnsafe(
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mints: { [pk: string]: MintAccount },
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pk: PublicKey,
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amount: number
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): BN {
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const mint = mints[pk.toBase58()]
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const nativeAmount = Math.round(amount * Math.pow(10, mint.decimals))
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return new BN(nativeAmount.toString())
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}
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