public static IInstruction Create(char instruction, TapeMemory tapeMemory, BrainmessProgram program)
{
IInstruction iInstruction = null;
switch (instruction)
{
case '>':
iInstruction = new ForwardInstruction(tapeMemory, program);
break;
case '<':
iInstruction = new BackwardInstruction(tapeMemory, program);
break;
case '+':
iInstruction = new IncreamentInstruction(tapeMemory, program);
break;
case '-':
iInstruction = new DecreamentInstruction(tapeMemory, program);
break;
case '.':
iInstruction = new OutputInstruction(tapeMemory, program);
break;
case ',':
iInstruction = new InputInstruction(tapeMemory, program);
break;
case '[':
iInstruction = new LoopForwardInstruction(tapeMemory, program);
break;
case ']':
iInstruction = new LoopBackwardInstruction(tapeMemory, program);
break;
}
return iInstruction;
}
public void TestLoopBackwardInstruction()
{
var loopBackwardInstruction = new LoopBackwardInstruction
(
new TapeMemory(),
new BrainmessProgram
{
Instructions = "--[++++]",
InstructionPointer = 5
}
) {TapeMemory = {CurrentCellValue = 1}};
loopBackwardInstruction.Execute();
Assert.AreEqual(2, loopBackwardInstruction.Program.InstructionPointer);
}