public bool ReadRecord(out PopCommand record)
{
record = default;
unsafe
{
fixed(byte *pByte = this.buffer)
{
// This pointer points to the current read point in the
// instruction stream.
byte *pCur = pByte;
// This points to the first byte past the end of the
// instruction stream (i.e. when to stop)
byte *pEndOfInstructions = pByte + this.currentReadOffset;
if ((pCur >= pEndOfInstructions)) //reach end
{
return(false);
}
RecordHeader *pCurRecord = (RecordHeader *)pCur;
if (pCurRecord->Type != RecordType.Pop)
{
return(false);
}
//pop command consumes no space
this.currentReadOffset += pCurRecord->Size;
return(true);
}
}
}
public void Pop(PopCommand command)
{
_file.WriteLine($"// Pop {command.Arg1} {command.Arg2}");
var segment = command.Arg1 switch
{
"local" => "LCL",
"argument" => "ARG",
"this" => "THIS",
"that" => "THAT",
_ => ""
};
if (!string.IsNullOrEmpty(segment))
{
this.PopToARegister();
_file.WriteLine("D=M");
_file.WriteLine($"@{segment}");
_file.WriteLine($"A=M");
for (int i = 0; i < command.Arg2; i++)
{
_file.WriteLine($"A=A+1");
}
_file.WriteLine($"M=D");
return;
}
var baseAddress = command.Arg1 switch
{
"temp" => "5",
"pointer" => "3",
_ => ""
};
if (!string.IsNullOrEmpty(baseAddress))
{
this.PopToARegister();
_file.WriteLine($"D=M");
_file.WriteLine($"@{baseAddress}");
for (int i = 0; i < command.Arg2; i++)
{
_file.WriteLine($"A=A+1");
}
_file.WriteLine($"M=D");
return;
}
if (command.Arg1 == "static")
{
this.PopToARegister();
_file.WriteLine($"D=M");
_file.WriteLine($"@{_name}.{command.Arg2}");
_file.WriteLine($"M=D");
return;
}
Debugger.WriteLine($"\"{command.Arg1}\"");
}
public void Run_Passes_InputOperationIsCorrect()
{
// Arrange
CommandContext context = new CommandContext();
context.PushStack(new MutableKeyValuePair <string, object>("var2", 5));
var stackSizeExpected = 0;
var pop = new PopCommand(context);
// Act
pop.Run();
// Assert
Assert.Equal(stackSizeExpected, context.Stack.Count);
}
public LoginPageModel(IAppStoreContainer storeContainer, AuthenticationActionCreator authenticationActionCreator)
{
var store = storeContainer.Store;
store.Subscribe(s =>
{
IsLoggingIn = s.AuthenticationState.IsLoggingIn;
if (s.AuthenticationState.Exception != null)
{
CoreMethods.DisplayAlert("An error occured",
s.AuthenticationState.Exception.Message, "OK");
return;
}
if (!string.IsNullOrEmpty(s.AuthenticationState.SessionId))
{
PopCommand.Execute(null);
}
});
PopCommand = new Command(() =>
{
CoreMethods.PopPageModel(true, true);
});
LoginCommand = new Command(() =>
{
if (string.IsNullOrEmpty(Username) || string.IsNullOrEmpty(Password))
{
CoreMethods.DisplayAlert("An error occured",
"All fields are required", "OK");
return;
}
store.Dispatch(authenticationActionCreator.LoginAction(new Model.Credentials
{
Password = Password,
Username = Username
}));
});
}
