Add AccountId

Sources/hedera/account/AccountId.swift

@@ -0,0 +1,42 @@
+public struct AccountId {
+    let shard: UInt64
+    let realm: UInt64
+    let num: UInt64
+
+    public init(accountNum: UInt64) {
+        self = AccountId(shard: 0, realm: 0, num: accountNum)
+    }
+
+    public init(shard: UInt64, realm: UInt64, num: UInt64) {
+        self.shard = shard
+        self.realm = realm
+        self.num = num
+    }
+}
+
+extension AccountId: CustomStringConvertible, CustomDebugStringConvertible {
+    public var description: String {
+        return "\(shard).\(realm).\(num)"
+    }
+
+    public var debugDescription: String {
+        return description
+    }
+}
+
+extension AccountId: LosslessStringConvertible {
+    public init?(_ description: String) {
+        let parts = description.split(separator: ".")
+        if parts.count != 3 {
+            return nil
+        }
+
+        guard let shard = UInt64(parts[parts.startIndex], radix: 10) else { return nil }
+        guard let realm = UInt64(parts[parts.startIndex.advanced(by: 1)], radix: 10) else { return nil }
+        guard let num = UInt64(parts[parts.startIndex.advanced(by: 2)], radix: 10) else { return nil }
+
+        self.shard = shard
+        self.realm = realm
+        self.num = num
+    }
+}

Tests/hederaTests/XCTestManifests.swift

@@ -6,6 +6,7 @@ public func allTests() -> [XCTestCaseEntry] {
         testCase(Ed25519PrivateKeyTests.allTests),
         testCase(Ed25519PublicKeyTests.allTests),
         testCase(HexTests.allTests),
+        testCase(AccountIdTests.allTests),
     ]
 }
 #endif

Tests/hederaTests/account/AccountIdTests.swift

@@ -0,0 +1,37 @@
+import XCTest
+import hedera
+
+final class AccountIdTests: XCTestCase {
+    static let allTests = [
+        ("testToString", testToString),
+        ("testFromString", testFromString),
+        ("testFromBadStrings", testFromBadStrings),
+    ]
+
+    func testToString() {
+        let id = AccountId(shard: 1, realm: 2, num: 3)
+        XCTAssertEqual(String(id), "1.2.3")
+    }
+
+    func testFromString() {
+        let id = AccountId("0.0.2")
+        XCTAssertNotNil(id)
+    }
+
+    func testFromBadStrings() {
+        var id = AccountId("0.0")
+        XCTAssertNil(id)
+
+        id = AccountId("a.2.3")
+        XCTAssertNil(id)
+
+        id = AccountId("1.b.3")
+        XCTAssertNil(id)
+
+        id = AccountId("1.2.c")
+        XCTAssertNil(id)
+
+        id = AccountId("1.2.3.4")
+        XCTAssertNil(id)
+    }
+}