Created
November 3, 2023 10:48
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BigInt to string
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| import Foundation | |
| import BigInt | |
| extension BigUInt { | |
| func string(decimals: Int) -> String { | |
| "\(self)".bigIntToString(decimals: decimals) | |
| } | |
| } | |
| extension BigInt { | |
| func bigIntToString(decimals: Int) -> String { | |
| "\(self)".bigIntToString(decimals: decimals) | |
| } | |
| } | |
| extension String { | |
| func bigIntToString(decimals: Int) -> String { | |
| var amount = self.components(separatedBy: ".").first ?? "0" | |
| if self == "0" || decimals == 0 { | |
| return amount | |
| } | |
| let dt = (decimals 1) - amount.count | |
| if dt > 0 { | |
| for _ in 0..<dt { | |
| amount.insert("0", at: amount.startIndex) | |
| } | |
| } | |
| var offset = amount.count - decimals | |
| if offset == 0 { | |
| offset = 1 | |
| } | |
| let left = amount[0..<offset] | |
| let right = amount[offset..<offset min(amount.count - left.count, 6)] | |
| let formattedAmount = left "." right | |
| return formattedAmount.trimmingZeroDecimal | |
| } | |
| func bigInt(decimals: Int) -> BigInt { | |
| guard decimals >= 0 else { | |
| return 0 | |
| } | |
| var numbers = self.components(separatedBy: ".") | |
| if numbers.count == 1 { | |
| var number = numbers[0] | |
| number = String(repeating: "0", count: decimals) | |
| return BigInt(stringLiteral: number) | |
| } else if numbers.count == 2 { | |
| var head = numbers[0] | |
| var tail = numbers[1] | |
| if tail.count > decimals { | |
| tail = tail[0..<decimals] | |
| let number = head tail | |
| return BigInt(stringLiteral: number) | |
| } else { | |
| let offset = decimals - tail.count | |
| var number = head tail | |
| number = String(repeating: "0", count: offset) | |
| return BigInt(stringLiteral: number) | |
| } | |
| } | |
| return 0 | |
| } | |
| } |
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