public function parse($instruction)
{
list($sources, $target) = explode(" -> ", $instruction);
if (is_numeric($sources)) {
return $this->circuit->sendSignal($target, $sources);
}
$parts = explode(" ", $sources);
if (count($parts) == 1) {
$value = $this->circuit->getWireValue($sources);
if (is_null($value)) {
return false;
}
return $this->circuit->sendSignal($target, $value);
}
if (count($parts) == 2) {
list($not, $source) = $parts;
$value = $this->circuit->getWireValue($source);
if (is_null($value)) {
return false;
}
return $this->circuit->sendSignal($target, ~$value);
}
list($source1, $type, $source2) = $parts;
$source1 = is_numeric($source1) ? $source1 : $this->circuit->getWireValue($source1);
$source2 = is_numeric($source2) ? $source2 : $this->circuit->getWireValue($source2);
if (is_null($source1) || is_null($source2)) {
return false;
}
switch ($type) {
case "AND":
$this->circuit->sendSignal($target, $source1 & $source2);
break;
case "OR":
$this->circuit->sendSignal($target, $source1 | $source2);
break;
case "LSHIFT":
$this->circuit->sendSignal($target, $source1 << $source2);
break;
case "RSHIFT":
$this->circuit->sendSignal($target, $source1 >> $source2);
break;
}
}
public function __invoke()
{
$circuit = new Circuit(new WiresCollection());
$parser = new InstructionsParser($circuit);
$input = file_get_contents(__DIR__ . "/../../input/Day7/Puzzle1");
$instructions = explode(PHP_EOL, $input);
while (true) {
foreach ($instructions as $k => $instruction) {
if ($parser->parse($instruction) !== false) {
unset($instructions[$k]);
}
}
if (empty($instructions)) {
break;
}
}
echo "Signal provided to wire 'a':" . $circuit->getWireValue("a");
}
