#!/usr/bin/php
<?php
/**
 * Anonymize a XSL-FO file from STDIN and print to STDOUT
 * This is handy for posting internal FO files e.g. to public mailing lists
 *
 * @author Philipp Wagner <mail@philipp-wagner.com>
 * @version 20080504
 */

/* utf-8 won't work here as a we have no way of working with
   multi-byte characters. */
$input = utf8_decode(file_get_contents('php://stdin'));

$insideTag = false;
$output = '';
for ($i=0; $i<strlen($input); $i++) {
    $char = $input[$i];
    $outChar = $char;
    if ($char == '<') $insideTag = true;
    if (!$insideTag) {
        if (preg_match('/[^\s\.\?\=]/', $char)) {
            $outChar = 'x';
        }
    }
    if ($char == '>') $insideTag = false;
    $output .= $outChar;
}
echo $output;
?>