public function runDiff($parent, $a, $b, $flags, $output)
{
$ct = coopy_Coopy::compareTables3($parent, $a, $b, $flags);
$align = $ct->align();
$td = new coopy_TableDiff($align, $flags);
$o = new coopy_SimpleTable(0, 0);
$os = new coopy_Tables($o);
$td->hiliteWithNesting($os);
$use_color = $flags->terminal_format === "ansi";
if ($flags->terminal_format === null) {
if (($output === null || $output === "-") && ($this->output_format === "copy" || $this->output_format === "csv")) {
if ($this->io !== null) {
if ($this->io->isTtyKnown()) {
$use_color = $this->io->isTty();
}
}
}
}
$this->saveTables($output, $os, $use_color);
}
