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<?php
/**
* @package dompdf
* @link https://github.com/dompdf/dompdf
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
namespace Dompdf\FrameDecorator;
use Dompdf\Cellmap;
use DOMNode;
use Dompdf\Css\Style;
use Dompdf\Dompdf;
use Dompdf\Frame;
/**
* Decorates Frames for table layout
*
* @package dompdf
*/
class Table extends AbstractFrameDecorator
{
public const VALID_CHILDREN = Style::TABLE_INTERNAL_TYPES;
/**
* List of all row-group display types.
*/
public const ROW_GROUPS = [
"table-row-group",
"table-header-group",
"table-footer-group"
];
/**
* The Cellmap object for this table. The cellmap maps table cells
* to rows and columns, and aids in calculating column widths.
*
* @var Cellmap
*/
protected $_cellmap;
/**
* Table header rows. Each table header is duplicated when a table
* spans pages.
*
* @var TableRowGroup[]
*/
protected $_headers;
/**
* Table footer rows. Each table footer is duplicated when a table
* spans pages.
*
* @var TableRowGroup[]
*/
protected $_footers;
/**
* Class constructor
*
* @param Frame $frame the frame to decorate
* @param Dompdf $dompdf
*/
public function __construct(Frame $frame, Dompdf $dompdf)
{
parent::__construct($frame, $dompdf);
$this->_cellmap = new Cellmap($this);
if ($frame->get_style()->table_layout === "fixed") {
$this->_cellmap->set_layout_fixed(true);
}
$this->_headers = [];
$this->_footers = [];
}
public function reset()
{
parent::reset();
$this->_cellmap->reset();
$this->_headers = [];
$this->_footers = [];
$this->_reflower->reset();
}
//........................................................................
/**
* Split the table at $row. $row and all subsequent rows will be
* added to the clone. This method is overridden in order to remove
* frames from the cellmap properly.
*/
public function split(?Frame $child = null, bool $page_break = false, bool $forced = false): void
{
if (is_null($child)) {
parent::split($child, $page_break, $forced);
return;
}
// If $child is a header or if it is the first non-header row, do
// not duplicate headers, simply move the table to the next page.
if (count($this->_headers)
&& !in_array($child, $this->_headers, true)
&& !in_array($child->get_prev_sibling(), $this->_headers, true)
) {
$first_header = null;
// Insert copies of the table headers before $child
foreach ($this->_headers as $header) {
$new_header = $header->deep_copy();
if (is_null($first_header)) {
$first_header = $new_header;
}
$this->insert_child_before($new_header, $child);
}
parent::split($first_header, $page_break, $forced);
} elseif (in_array($child->get_style()->display, self::ROW_GROUPS, true)) {
// Individual rows should have already been handled
parent::split($child, $page_break, $forced);
} else {
$iter = $child;
while ($iter) {
$this->_cellmap->remove_row($iter);
$iter = $iter->get_next_sibling();
}
parent::split($child, $page_break, $forced);
}
}
public function copy(DOMNode $node)
{
$deco = parent::copy($node);
// In order to keep columns' widths through pages
$deco->_cellmap->set_columns($this->_cellmap->get_columns());
$deco->_cellmap->lock_columns();
return $deco;
}
/**
* Static function to locate the parent table of a frame
*
* @param Frame $frame
*
* @return Table the table that is an ancestor of $frame
*/
public static function find_parent_table(Frame $frame)
{
while ($frame = $frame->get_parent()) {
if ($frame->is_table()) {
break;
}
}
return $frame;
}
/**
* Return this table's Cellmap
*
* @return Cellmap
*/
public function get_cellmap()
{
return $this->_cellmap;
}
//........................................................................
/**
* Check for text nodes between valid table children that only contain white
* space, except if white space is to be preserved.
*
* @param AbstractFrameDecorator $frame
*
* @return bool
*/
private function isEmptyTextNode(AbstractFrameDecorator $frame): bool
{
// This is based on the white-space pattern in `FrameReflower\Text`,
// i.e. only match on collapsible white space
$wsPattern = '/^[^\S\xA0\x{202F}\x{2007}]*$/u';
$validChildOrNull = function ($frame) {
return $frame === null
|| in_array($frame->get_style()->display, self::VALID_CHILDREN, true);
};
return $frame instanceof Text
&& !$frame->is_pre()
&& preg_match($wsPattern, $frame->get_text())
&& $validChildOrNull($frame->get_prev_sibling())
&& $validChildOrNull($frame->get_next_sibling());
}
/**
* Restructure tree so that the table has the correct structure. Misplaced
* children are appropriately wrapped in anonymous row groups, rows, and
* cells.
*
* https://www.w3.org/TR/CSS21/tables.html#anonymous-boxes
*/
public function normalize(): void
{
$column_caption = ["table-column-group", "table-column", "table-caption"];
$children = iterator_to_array($this->get_children());
$tbody = null;
foreach ($children as $child) {
$display = $child->get_style()->display;
if (in_array($display, self::ROW_GROUPS, true)) {
// Reset anonymous tbody
$tbody = null;
// Add headers and footers
if ($display === "table-header-group") {
$this->_headers[] = $child;
} elseif ($display === "table-footer-group") {
$this->_footers[] = $child;
}
continue;
}
if (in_array($display, $column_caption, true)) {
continue;
}
// Remove empty text nodes between valid children
if ($this->isEmptyTextNode($child)) {
$this->remove_child($child);
continue;
}
// Catch consecutive misplaced frames within a single anonymous group
if ($tbody === null) {
$tbody = $this->create_anonymous_child("tbody", "table-row-group");
$this->insert_child_before($tbody, $child);
}
$tbody->append_child($child);
}
// Handle empty table: Make sure there is at least one row group
if (!$this->get_first_child()) {
$tbody = $this->create_anonymous_child("tbody", "table-row-group");
$this->append_child($tbody);
}
foreach ($this->get_children() as $child) {
$display = $child->get_style()->display;
if (in_array($display, self::ROW_GROUPS, true)) {
$this->normalizeRowGroup($child);
}
}
}
private function normalizeRowGroup(AbstractFrameDecorator $frame): void
{
$children = iterator_to_array($frame->get_children());
$tr = null;
foreach ($children as $child) {
$display = $child->get_style()->display;
if ($display === "table-row") {
// Reset anonymous tr
$tr = null;
continue;
}
// Remove empty text nodes between valid children
if ($this->isEmptyTextNode($child)) {
$frame->remove_child($child);
continue;
}
// Catch consecutive misplaced frames within a single anonymous row
if ($tr === null) {
$tr = $frame->create_anonymous_child("tr", "table-row");
$frame->insert_child_before($tr, $child);
}
$tr->append_child($child);
}
// Handle empty row group: Make sure there is at least one row
if (!$frame->get_first_child()) {
$tr = $frame->create_anonymous_child("tr", "table-row");
$frame->append_child($tr);
}
foreach ($frame->get_children() as $child) {
$this->normalizeRow($child);
}
}
private function normalizeRow(AbstractFrameDecorator $frame): void
{
$children = iterator_to_array($frame->get_children());
$td = null;
foreach ($children as $child) {
$display = $child->get_style()->display;
if ($display === "table-cell") {
// Reset anonymous td
$td = null;
continue;
}
// Remove empty text nodes between valid children
if ($this->isEmptyTextNode($child)) {
$frame->remove_child($child);
continue;
}
// Catch consecutive misplaced frames within a single anonymous cell
if ($td === null) {
$td = $frame->create_anonymous_child("td", "table-cell");
$frame->insert_child_before($td, $child);
}
$td->append_child($child);
}
// Handle empty row: Make sure there is at least one cell
if (!$frame->get_first_child()) {
$td = $frame->create_anonymous_child("td", "table-cell");
$frame->append_child($td);
}
}
}
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