Adding new decoders & encoders to retrieve decimals

Trust/Vendors/New Group/Commands/GetERC20Decimals.swift

@@ -0,0 +1,26 @@
+// Copyright SIX DAY LLC. All rights reserved.
+
+import Foundation
+import TrustKeystore
+
+struct GetERC20DecimalsEncode: Web3Request {
+    typealias Response = String
+
+    static let abi = "{\"constant\":true,\"inputs\":[],\"name\":\"decimals\",\"outputs\":[{\"name\":\"\",\"type\":\"uint8\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}"
+
+    var type: Web3RequestType {
+        let run = "web3.eth.abi.encodeFunctionCall(\(GetERC20DecimalsEncode.abi), [])"
+        return .script(command: run)
+    }
+}
+
+struct GetERC20DecimalsDecode: Web3Request {
+    typealias Response = String
+
+    let data: String
+
+    var type: Web3RequestType {
+        let run = "web3.eth.abi.decodeParameter('uint8', '\(data)')"
+        return .script(command: run)
+    }
+}