bi-interpret

#!/usr/bin/env php
<?php

require_once 'bi.php';	// Require the brainfuck library

if(in_array('-h', $argv) || in_array('-?', $argv) || in_array('--help', $argv)) {
	echo "\nUSAGE: ", $argv[0], " [-h | -? | --help | <input file>]\n\n",
	     "Reads brainfuck code to be interpreted from <input file> (or standard",
	     "input if no file is specified) then executes the specified program.  ",
	     "If one of -h, -? or --help is specified, print this message then ",
	     "exit.";
	exit;
}

if(count($argv) == 1) {
	if(!defined('STDIN')) {
		echo "Error: Cannot read from standard input.\n";
		exit(1);
	}
	$inputResource = STDIN;
} else {
	$inputResource = fopen($argv[1], 'r', true);
	if(!$inputResource) {
		echo "Error opening file `", $argv[1], "\n";
		exit(1);
	}
}

$inputFile = '';
while($line = fgets($inputResource)) {
	$inputFile .= $line;
}

$interpreter = new BrainfuckInterpreter();
$interpreter->Interpret($inputFile);