public function testWireCountIsZeroToStart()
{
$circuit = new Circuit();
$this->assertCount(0, $circuit->getWires());
}
<?php
//middleware solution
$wires = [];
$instructions = ['123 -> x', '456 -> y', 'x AND y -> d', 'x OR y -> e', 'x LSHIFT 2 -> f', 'y RSHIFT 2 -> g', 'NOT x -> h', 'NOT y -> i'];
//$instructions = file('7.txt');
$circuit = new Circuit();
foreach ($instructions as $instruction) {
$circuit->processInstruction($instruction);
}
print_r($circuit->getWires());
class Circuit
{
private $wires = [];
public function processInstruction($instruction)
{
preg_match('/^(?<a>.* ?)(?<operator>(AND|OR|LSHIFT|RSHIFT|NOT))? ?(?<b>.*) -> (?<wire>.*)$/', $instruction, $matches);
print_r($matches);
// We are dealing with a gate
if (!empty($matches['operator'])) {
$gate = new LogicGate();
$input = $gate->process($matches['operator'], $this->getValue($matches['a']), $this->getValue($matches['b']));
} else {
$input = !empty($matches['a']) ? $matches['a'] : $matches['b'];
$input = $this->getValue($input);
}
$this->wires[$matches['wire']] = $input;
}
public function getValue($input)
{
return is_numeric($input) ? (int) $input : $this->getWireValue($input);
