Text_Diff_Renderer::_block( $xbeg, $xlen, $ybeg, $ylen, $edits )

151    function _block($xbeg, $xlen, $ybeg, $ylen, &$edits)152    {153        $output = $this->_startBlock($this->_blockHeader($xbeg, $xlen, $ybeg, $ylen));154 155        foreach ($edits as $edit) {156            switch (strtolower(get_class($edit))) {157            case 'text_diff_op_copy':158                $output .= $this->_context($edit->orig);159                break;160 161            case 'text_diff_op_add':162                $output .= $this->_added($edit->final);163                break;164 165            case 'text_diff_op_delete':166                $output .= $this->_deleted($edit->orig);167                break;168 169            case 'text_diff_op_change':170                $output .= $this->_changed($edit->orig, $edit->final);171                break;172            }173        }174 175        return $output . $this->_endBlock();176    }