Search moodle.org's
Developer Documentation

See Release Notes
Long Term Support Release

  • Bug fixes for general core bugs in 3.9.x will end* 10 May 2021 (12 months).
  • Bug fixes for security issues in 3.9.x will end* 8 May 2023 (36 months).
  • PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
<?php

/**
 * Definition for tables.  The general idea is to extract out all of the
 * essential bits, and then reconstruct it later.
 *
 * This is a bit confusing, because the DTDs and the W3C
 * validators seem to disagree on the appropriate definition. The
 * DTD claims:
 *
 *      (CAPTION?, (COL*|COLGROUP*), THEAD?, TFOOT?, TBODY+)
 *
 * But actually, the HTML4 spec then has this to say:
 *
 *      The TBODY start tag is always required except when the table
 *      contains only one table body and no table head or foot sections.
 *      The TBODY end tag may always be safely omitted.
 *
 * So the DTD is kind of wrong.  The validator is, unfortunately, kind
 * of on crack.
 *
 * The definition changed again in XHTML1.1; and in my opinion, this
 * formulation makes the most sense.
 *
 *      caption?, ( col* | colgroup* ), (( thead?, tfoot?, tbody+ ) | ( tr+ ))
 *
 * Essentially, we have two modes: thead/tfoot/tbody mode, and tr mode.
 * If we encounter a thead, tfoot or tbody, we are placed in the former
 * mode, and we *must* wrap any stray tr segments with a tbody. But if
 * we don't run into any of them, just have tr tags is OK.
 */
class HTMLPurifier_ChildDef_Table extends HTMLPurifier_ChildDef
{
    /**
     * @type bool
     */
    public $allow_empty = false;

    /**
     * @type string
     */
    public $type = 'table';

    /**
     * @type array
     */
    public $elements = array(
        'tr' => true,
        'tbody' => true,
        'thead' => true,
        'tfoot' => true,
        'caption' => true,
        'colgroup' => true,
        'col' => true
    );

    public function __construct()
    {
    }

    /**
     * @param array $children
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return array
     */
    public function validateChildren($children, $config, $context)
    {
        if (empty($children)) {
            return false;
        }

        // only one of these elements is allowed in a table
        $caption = false;
        $thead = false;
        $tfoot = false;

        // whitespace
        $initial_ws = array();
        $after_caption_ws = array();
        $after_thead_ws = array();
        $after_tfoot_ws = array();

        // as many of these as you want
        $cols = array();
        $content = array();

        $tbody_mode = false; // if true, then we need to wrap any stray
                             // <tr>s with a <tbody>.

        $ws_accum =& $initial_ws;

        foreach ($children as $node) {
            if ($node instanceof HTMLPurifier_Node_Comment) {
                $ws_accum[] = $node;
                continue;
            }
            switch ($node->name) {
            case 'tbody':
                $tbody_mode = true;
                // fall through
            case 'tr':
                $content[] = $node;
                $ws_accum =& $content;
                break;
            case 'caption':
                // there can only be one caption!
                if ($caption !== false)  break;
                $caption = $node;
                $ws_accum =& $after_caption_ws;
                break;
            case 'thead':
                $tbody_mode = true;
                // XXX This breaks rendering properties with
                // Firefox, which never floats a <thead> to
                // the top. Ever. (Our scheme will float the
                // first <thead> to the top.)  So maybe
                // <thead>s that are not first should be
                // turned into <tbody>? Very tricky, indeed.
                if ($thead === false) {
                    $thead = $node;
                    $ws_accum =& $after_thead_ws;
                } else {
                    // Oops, there's a second one! What
                    // should we do?  Current behavior is to
                    // transmutate the first and last entries into
                    // tbody tags, and then put into content.
                    // Maybe a better idea is to *attach
                    // it* to the existing thead or tfoot?
                    // We don't do this, because Firefox
                    // doesn't float an extra tfoot to the
                    // bottom like it does for the first one.
                    $node->name = 'tbody';
                    $content[] = $node;
                    $ws_accum =& $content;
                }
                break;
            case 'tfoot':
                // see above for some aveats
                $tbody_mode = true;
                if ($tfoot === false) {
                    $tfoot = $node;
                    $ws_accum =& $after_tfoot_ws;
                } else {
                    $node->name = 'tbody';
                    $content[] = $node;
                    $ws_accum =& $content;
                }
                break;
            case 'colgroup':
            case 'col':
                $cols[] = $node;
                $ws_accum =& $cols;
                break;
            case '#PCDATA':
                // How is whitespace handled? We treat is as sticky to
                // the *end* of the previous element. So all of the
                // nonsense we have worked on is to keep things
                // together.
                if (!empty($node->is_whitespace)) {
                    $ws_accum[] = $node;
                }
                break;
            }
        }

< if (empty($content)) {
> if (empty($content) && $thead === false && $tfoot === false) {
return false; } $ret = $initial_ws; if ($caption !== false) { $ret[] = $caption; $ret = array_merge($ret, $after_caption_ws); } if ($cols !== false) { $ret = array_merge($ret, $cols); } if ($thead !== false) { $ret[] = $thead; $ret = array_merge($ret, $after_thead_ws); } if ($tfoot !== false) { $ret[] = $tfoot; $ret = array_merge($ret, $after_tfoot_ws); } if ($tbody_mode) { // we have to shuffle tr into tbody $current_tr_tbody = null; foreach($content as $node) { switch ($node->name) { case 'tbody': $current_tr_tbody = null; $ret[] = $node; break; case 'tr': if ($current_tr_tbody === null) { $current_tr_tbody = new HTMLPurifier_Node_Element('tbody'); $ret[] = $current_tr_tbody; } $current_tr_tbody->children[] = $node; break; case '#PCDATA': //assert($node->is_whitespace); if ($current_tr_tbody === null) { $ret[] = $node; } else { $current_tr_tbody->children[] = $node; } break; } } } else { $ret = array_merge($ret, $content); } return $ret; } } // vim: et sw=4 sts=4