public static bool TryLoad(ProtocolSettings settings, DataCache snapshot, UInt160 scriptHash, out Nep17Contract contract)
{
if (scriptHash == NativeContract.NEO.Hash)
{
contract = Nep17Contract.Create(NativeContract.NEO);
return(true);
}
if (scriptHash == NativeContract.GAS.Hash)
{
contract = Nep17Contract.Create(NativeContract.GAS);
return(true);
}
var contractState = NativeContract.ContractManagement.GetContract(snapshot, scriptHash);
if (contractState != null)
{
using var sb = new ScriptBuilder();
sb.EmitDynamicCall(scriptHash, "symbol");
sb.EmitDynamicCall(scriptHash, "decimals");
using var engine = sb.Invoke(settings, snapshot);
if (engine.State != VMState.FAULT && engine.ResultStack.Count >= 2)
{
var decimals = (byte)engine.ResultStack.Pop <Neo.VM.Types.Integer>().GetInteger();
var symbol = Encoding.UTF8.GetString(engine.ResultStack.Pop().GetSpan());
contract = new Nep17Contract(symbol, decimals, scriptHash);
return(true);
}
}
contract = default;
return(false);
}
public static bool TryLoad(DataCache snapshot, UInt160 scriptHash, out Nep17Contract contract)
{
if (scriptHash == NativeContract.NEO.Hash)
{
contract = new Nep17Contract(
NativeContract.NEO.Name,
NativeContract.NEO.Symbol,
NativeContract.NEO.Decimals,
NativeContract.NEO.Hash);
return(true);
}
if (scriptHash == NativeContract.GAS.Hash)
{
contract = new Nep17Contract(
NativeContract.GAS.Name,
NativeContract.GAS.Symbol,
NativeContract.GAS.Decimals,
NativeContract.GAS.Hash);
return(true);
}
var contractState = NativeContract.ContractManagement.GetContract(snapshot, scriptHash);
if (contractState != null)
{
using var sb = new ScriptBuilder();
sb.EmitDynamicCall(scriptHash, "symbol");
sb.EmitDynamicCall(scriptHash, "decimals");
using var engine = Neo.SmartContract.ApplicationEngine.Run(sb.ToArray(), snapshot);
if (engine.State != VMState.FAULT && engine.ResultStack.Count >= 2)
{
var decimals = (byte)engine.ResultStack.Pop <Neo.VM.Types.Integer>().GetInteger();
var symbol = Encoding.UTF8.GetString(engine.ResultStack.Pop().GetSpan());
contract = new Nep17Contract(contractState.Manifest.Name, symbol, decimals, scriptHash);
return(true);
}
}
contract = default;
return(false);
}