_block_header example

if (!empty($xi)) {
      $this->line_stats['counter']['x'] += $xi;
    }
    if (!empty($yi)) {
      $this->line_stats['counter']['y'] += $yi;
    }

    return $end;
  }

  protected 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') {
        
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