Replace the JavaScript mobile app with a native Swift iOS wallet

2026-09-19 13:33:11 +08:00
parent d80b58b704
commit 3e1a39d4d7
79 changed files with 25482 additions and 4023 deletions
@@ -0,0 +1,53 @@
+import Foundation
+
+/// Exact decimal <-> drops conversion (1 XRP = 1_000_000 drops) without
+/// floating point rounding errors.
+enum XRPAmount {
+  static let dropsPerXRP: UInt64 = 1_000_000
+  static let maxDrops: UInt64 = 100_000_000_000 * dropsPerXRP  // 1e11 XRP
+
+  static func drops(fromXRP value: String) throws -> UInt64 {
+    let text = value.trimmingCharacters(in: .whitespacesAndNewlines)
+    guard !text.isEmpty, !text.hasPrefix("-"), !text.hasPrefix("+") else {
+      throw XRPError.rpc("Enter a valid amount")
+    }
+    let parts = text.split(separator: ".", omittingEmptySubsequences: false)
+    guard parts.count <= 2 else { throw XRPError.rpc("Enter a valid amount") }
+
+    let wholeText = parts[0].isEmpty ? "0" : String(parts[0])
+    guard let whole = UInt64(wholeText) else { throw XRPError.rpc("Enter a valid amount") }
+
+    var fraction: UInt64 = 0
+    if parts.count == 2 {
+      let fractionText = String(parts[1])
+      guard fractionText.count <= 6, fractionText.allSatisfy({ $0.isNumber }) else {
+        throw XRPError.rpc("XRP supports at most 6 decimal places")
+      }
+      let padded = fractionText.padding(toLength: 6, withPad: "0", startingAt: 0)
+      guard let parsed = UInt64(padded) else { throw XRPError.rpc("Enter a valid amount") }
+      fraction = parsed
+    }
+
+    let (wholeDrops, overflow) = whole.multipliedReportingOverflow(by: dropsPerXRP)
+    guard !overflow else { throw XRPError.rpc("Amount is too large") }
+    let (total, carry) = wholeDrops.addingReportingOverflow(fraction)
+    guard !carry, total <= maxDrops else { throw XRPError.rpc("Amount is too large") }
+    return total
+  }
+
+  static func xrp(fromDrops drops: String) -> String {
+    guard let value = UInt64(drops.trimmingCharacters(in: .whitespacesAndNewlines)) else {
+      return "0"
+    }
+    return xrp(fromDrops: value)
+  }
+
+  static func xrp(fromDrops value: UInt64) -> String {
+    let whole = value / dropsPerXRP
+    let fraction = value % dropsPerXRP
+    if fraction == 0 { return String(whole) }
+    var fractionText = String(format: "%06llu", fraction)
+    while fractionText.hasSuffix("0") { fractionText.removeLast() }
+    return "\(whole).\(fractionText)"
+  }
+}