indent_list_to_xml.php

<?php
function indent_list_to_array(&$lines)
{
    $res = Array();
    $indent_size = get_indent_size(current($lines));
    while (true) {
        $current_line = current($lines);
        //echo "$current_line \n";
        $line_content = trim($current_line);
        if (get_indent_size($current_line) < $indent_size) {
            break;
        }
        if (false === next($lines)) break;
        if (empty($line_content)) continue;
        if (get_indent_size(current($lines)) > $indent_size) {
            $res[$current_line] = indent_list_to_array($lines);
        } else {
            $res[$current_line] = Array();
        }
    }
    return $res;

}//end indent_list_to_array()


function get_indent_size($s)
{
    $res = 0;
    while ($s{$res} == "\t") {
        $res++;
    }
    return $res;

}//end get_indent_size()


function print_array_xml_r($res, $indent='')
{
    if (empty($res)) {
        echo '(empty)';
    } else {
        foreach ($res as $item => $kids) {
            echo $indent.'<term name="'.htmlspecialchars(trim($item)).'">';
            if (!empty($kids)) {
                echo "\n";
                echo $indent."\t".'<relation name="Category">'."\n";
                print_array_xml_r($kids, $indent."\t\t");
                echo $indent."\t".'</relation>'."\n";
                echo $indent;
            }
            echo '</term>'."\n";
        }
    }

}//end print_array_xml_r()


// MAIN //
if ($argc != 2) {
    echo "Usage: php indent_list_to_xml inputfile.txt > outputfile.xml \n";
    exit();
}
?>
<thesaurus>
<?php
    $lines = file($argv[1]);
    reset($lines);
    $res = indent_list_to_array($lines, $res);
    print_array_xml_r($res, "\t\t");
?>
</thesaurus>