function _block($xbeg, $xlen, $ybeg, $ylen, &$edits) {
$this
->_start_block($this
->_block_header($xbeg, $xlen, $ybeg, $ylen));
foreach ($edits as $edit) {
if ($edit->type == 'copy') {
$this
->_context($edit->orig);
}
elseif ($edit->type == 'add') {
$this
->_added($edit->closing);
}
elseif ($edit->type == 'delete') {
$this
->_deleted($edit->orig);
}
elseif ($edit->type == 'change') {
$this
->_changed($edit->orig, $edit->closing);
}
else {
trigger_error('Unknown edit type', E_USER_ERROR);
}
}
$this
->_end_block();
}