/// <summary>
/// Parse an incoming line based on '->'
/// </summary>
private Day7Operation ParseLine(string line)
{
var parts = line.Split("->", StringSplitOptions.TrimEntries);
if (parts.Length != 2)
{
throw new Exception($"Invalid split: {line}");
}
// Start our return object
var ret = new Day7Operation()
{
outputRegister = parts[1]
};
// 2 params:
// AND
// OR
// LSHIFT
// RSHIFT
// NOT = 1 param
// SET (1234 -> abc) = No params-ish
var matches = (new Regex("^([a-z0-9]+) (AND|OR|LSHIFT|RSHIFT) ([a-z0-9]+)$")).Match(parts[0]);
if (matches.Success)
{
ret.inA = matches.Groups[1].Value;
ret.operation = matches.Groups[2].Value;
ret.inB = matches.Groups[3].Value;
UInt16 o;
if (UInt16.TryParse(ret.inA, out o))
{
ret.inA = string.Empty;
ret.inAVal = o;
}
if (UInt16.TryParse(ret.inB, out o))
{
ret.inB = string.Empty;
ret.inBVal = o;
}
return(ret);
}
matches = (new Regex("^(NOT) ([a-z]+)$")).Match(parts[0]);
if (matches.Success)
{
ret.inA = matches.Groups[2].Value;
ret.operation = matches.Groups[1].Value;
return(ret);
}
matches = (new Regex("^([0-9a-z]+)$")).Match(parts[0]);
if (matches.Success)
{
ret.inA = matches.Groups[1].Value;
ret.operation = "SET";
// If this is a hard-coded integer, this is a starting point
UInt16 o;
if (UInt16.TryParse(ret.inA, out o))
{
ret.setValue = o;
ret.order = 0;
}
return(ret);
}
// No results
throw new Exception($"Unable to find a match for: {line}");
}
private void ProcessOperation(Day7Operation operation)
{
UInt16 value = 0;
switch (operation.operation)
{
case "SET":
{
if (operation.setValue < UInt16.MaxValue)
{
value = operation.setValue;
}
else
{
value = GetRegister(operation.inA);
}
break;
}
case "AND":
{
UInt16 a = operation.inAVal < UInt16.MaxValue ? operation.inAVal : GetRegister(operation.inA);
UInt16 b = operation.inBVal < UInt16.MaxValue ? operation.inBVal : GetRegister(operation.inB);
value = (UInt16)(a & b);
break;
}
case "OR":
{
UInt16 a = operation.inAVal < UInt16.MaxValue ? operation.inAVal : GetRegister(operation.inA);
UInt16 b = operation.inBVal < UInt16.MaxValue ? operation.inBVal : GetRegister(operation.inB);
value = (UInt16)(a | b);
break;
}
case "NOT":
{
UInt16 a = operation.inAVal < UInt16.MaxValue ? operation.inAVal : GetRegister(operation.inA);
value = (UInt16)(~a);
break;
}
case "LSHIFT":
{
UInt16 a = operation.inAVal < UInt16.MaxValue ? operation.inAVal : GetRegister(operation.inA);
UInt16 b = operation.inBVal < UInt16.MaxValue ? operation.inBVal : GetRegister(operation.inB);
value = (UInt16)(a << b);
break;
}
case "RSHIFT":
{
UInt16 a = operation.inAVal < UInt16.MaxValue ? operation.inAVal : GetRegister(operation.inA);
UInt16 b = operation.inBVal < UInt16.MaxValue ? operation.inBVal : GetRegister(operation.inB);
value = (UInt16)(a >> b);
break;
}
}
SaveRegister(operation.outputRegister, value);
}