Aer Interpreter Source
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class Brainfuck {
private string $code;
private int $code_pointer;
private int[] $cells;
private int $pointer;
private string $input;
private int $input_pointer;
private int[] $buffer;
private string $output;
public void __construct(string $code, string $input = NULL) {
$this->code = $code;
$this->input = $input;
}
public void run() {
while ($this->code_pointer < strlen($this->code)) {
$this->interpret($this->code[$this->code_pointer]);
$this->code_pointer++;
}
print($this->output);
}
private void interpret(string $command) {
if(!$this->cells[$this->pointer]) {
$this->cells[$this->pointer] = 0;
}
switch ($command) {
case '>' :
$this->pointer++;
break;
case '<' :
$this->pointer--;
break;
case '+' :
$this->cells[$this->pointer]++;
if($this->cells[$this->pointer] > 255) {
$this->cells[$this->pointer] = 0;
}
break;
case '-' :
$this->cells[$this->pointer]--;
if($this->cells[$this->pointer] < 0) {
$this->cells[$this->pointer] = 255;
}
break;
case '.' :
$this->output += chr($this->cells[$this->pointer]);
break;
case ',' :
$this->cells[$this->pointer] = $this->input[$this->input_pointer] ? ord($this->input[$this->input_pointer]) : 0;
$this->input_pointer++;
break;
case '[' :
if($this->cells[$this->pointer] == 0) {
int $delta = 1;
while($delta && $this->code_pointer++ < strlen($this->code)) {
switch ($this->code[$this->code_pointer]) {
case '[' :
$delta++;
break;
case ']' :
$delta--;
break;
}
}
} else {
$this->buffer[] = $this->code_pointer;
}
break;
case ']' :
$this->code_pointer = array_pop($this->buffer) - 1;
}
}
}
class Program {
void main() {
object $bf;
string $code;
resource $dir;
string $file;
string[] $files;
string $input;
$dir = opendir('tests/data/brainfuck');
while($file = readdir($dir)) {
if($file == '.' || $file == '..') {
continue;
}
$files[] = $file;
}
sort($files);
unset($file);
for(int $n = 0; $n < sizeof($files); $n++) {
print('Executing "' + $files[$n] + '"' + "\n");
$code = file_get_contents('tests/data/brainfuck/' + $files[$n]);
$bf = new Brainfuck($code, $input);
$bf->run();
print("\n");
}
closedir($dir);
}
}