private void print(int addr, ValuePart val) //print each cell from address to address
{
switch (outputMode)
{
case OutputMode.ASCII:
for (int i = addr; i <= val.Address; i++)
{
Console.Write((char)tape[i]);
}
break;
case OutputMode.Decimal:
for (int i = addr; i <= val.Address; i++)
{
if (i > addr)
Console.Write("-");
Console.Write(tape[i]);
}
break;
case OutputMode.Hex:
for (int i = addr; i <= val.Address; i++)
{
if (i > addr)
Console.Write("-");
Console.Write(tape[i].ToString("X2"));
}
break;
}
}
private ExitStatus exit(ValuePart val) //attempt to return known exit status by value, else return unknown
{
ExitStatus status = ExitStatus.Unknown;
if (Enum.IsDefined(typeof(ExitStatus), val.Value))
status = (ExitStatus)val.Value;
return status;
}
private void set(int addr, ValuePart val) //set cell at address on tape to value
{
tape[addr] = (byte)val.Value;
}
private void div(int addr, ValuePart val) //divides the value at the given address on the tape by val
{
tape[addr] /= (byte)val.Value;
}
private void mod(int addr, ValuePart val) //sets the value at the given address on the tape to the mod of that value and val
{
tape[addr] %= (byte)val.Value;
}
private void mul(int addr, ValuePart val) //multiplies the value at the given address on the tape by val
{
tape[addr] *= (byte)val.Value;
}
private void sub(int addr, ValuePart val) //subtracts val from the value at given address on the tape
{
tape[addr] -= (byte)val.Value;
}
private void add(int addr, ValuePart val) //adds val to the value at given address on the tape
{
tape[addr] += (byte)val.Value;
}
private void lookahead(ValuePart val) //looks forward and begins execution at a flag with the same value (greedy)
{
for (; currentStatement < statements.Length; currentStatement++)
{
if ((Instruction)Convert.ToInt32(statements[currentStatement].Substring(0, 1), 16) == Instruction.Label
&& getValuePart(statements[currentStatement]).Value == val.Value) //if statement is a label and value part is equal to lookahead value
return;
}
}
private void input(int addr, ValuePart val) //get text input starting at addr, setting val cell to input end address
{
string input = Console.ReadLine();
int num;
if (int.TryParse(input, out num) && num < 256) //if input is just a number less than 256, set addr to that number
{
tape[addr] = (byte)num;
tape[val.Address] = 0x01;
return;
}
int i;
for (i = 0; i < input.Length; i++)
{
tape[i + addr] = (byte)input[i];
}
tape[val.Address] = (byte)(i + addr);
}