rdfhash

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

namespace RdfHash;

use RdfHash\RdfHashing;
use EasyRdf\Graph;

require("./vendor/autoload.php");

function arguments($argv) {
    $_ARG = array();
    foreach ($argv as $arg) {
        if (preg_match('/--([^=]+)=(.*)/',$arg,$reg)) {
            $_ARG[$reg[1]] = $reg[2];
        } elseif(preg_match('/--?([a-zA-Z0-9]+)/',$arg,$reg)) {
            $_ARG[$reg[1]] = 'true';
        }
    }
    return $_ARG;
}

function printHelpAndExit($message = null) {
    if (!is_null($message)) {
        print($message);
    }
    print("\nUsage: rdfhash --source\n");
    print("  --source : file or url of rdf source\n");
    exit;
}

function getFile($filename) {
    $filename = realpath($filename);
    if (file_exists($filename) && is_readable($filename)) {
        $graph = new \EasyRdf\Graph();
        $graph->parseFile($filename);
        return $graph;
    }
    throw new \Exception("File not found or un-readable");
}

function getUrl($source) {
    $graph = new \EasyRdf\Graph();
    $graph->load($source);
    return $graph;
}

$arguments = arguments($argv);

if (!isset($arguments['source'])) {
    printHelpAndExit("You must provide a source path or url\n");
}

if (strpos($arguments['source'], 'http') === 0) {
    $graph = getUrl($arguments['source']);
} else {
    $graph = getFile($arguments['source']);
}

if (isset($arguments['debug'])) {
  $string = RdfHashing::getGraphString($graph);
  print($string . "\n");
}
$hash = RdfHashing::calculate($graph);
print($hash);
exit;