/// <summary>
/// Runs the specified program.
/// </summary>
/// <param name="instructions">The program instructions.</param>
/// <returns>
/// A <see cref="Cpu"/> containing the value of each CPU register at the end of the program.
/// </returns>
private static Cpu RunProgram(ICollection <string> instructions)
{
var program = instructions
.Select((p) => new Instruction(p))
.ToList();
var cpu = new Cpu();
foreach (Instruction instruction in program)
{
int conditionRegisterValue = cpu.GetValueOrDefault(instruction.ConditionRegister);
if (!Evaluate(conditionRegisterValue, instruction.ConditionComparand, instruction.ConditionOperator))
{
continue;
}
if (!cpu.ContainsKey(instruction.TargetRegister))
{
cpu[instruction.TargetRegister] = 0;
}
if (instruction.TargetOperator)
{
cpu[instruction.TargetRegister] += instruction.OperatorValue;
}
else
{
cpu[instruction.TargetRegister] -= instruction.OperatorValue;
}
cpu.HighestValue = Math.Max(cpu.HighestValue, cpu.Values.DefaultIfEmpty().Max());
}
return(cpu);
}