#!/usr/bin/php
<?php
/** Converts TriG, Turtle, N3, N-QUADS or N-TRIPLES input to TriG, Turtle, N-QUADS or N-TRIPLES*/
include_once __DIR__.'/../vendor/autoload.php';
use pietercolpaert\hardf\TriGParser;
use pietercolpaert\hardf\TriGWriter;

$informat = 'turtle';
if (isset($argv[1])) {
    $informat = $argv[1];
}

$outformat = 'n-triples';
if (isset($argv[2])) {
    $outformat = $argv[2];
}

$writer = new TriGWriter(['format' => $outformat]);
$parser = new TriGParser(['format' => $informat], function ($error, $triple) use (&$writer) {
    if (!isset($error) && !isset($triple)) { //flags end
        echo $writer->end();
    } elseif (!$error) {
        $writer->addTriple($triple);
        echo $writer->read();
    } else {
        fwrite(STDERR, $error->getMessage()."\n");
    }
});

while ($line = fgets(STDIN)) {
    $parser->parseChunk($line);
}
$parser->end();