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Andrew Dolgov
227
lib/htmlpurifier/library/HTMLPurifier/ChildDef/Table.php
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227
lib/htmlpurifier/library/HTMLPurifier/ChildDef/Table.php
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<?php
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/**
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* Definition for tables. The general idea is to extract out all of the
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* essential bits, and then reconstruct it later.
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*
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* This is a bit confusing, because the DTDs and the W3C
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* validators seem to disagree on the appropriate definition. The
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* DTD claims:
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*
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* (CAPTION?, (COL*|COLGROUP*), THEAD?, TFOOT?, TBODY+)
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*
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* But actually, the HTML4 spec then has this to say:
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*
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* The TBODY start tag is always required except when the table
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* contains only one table body and no table head or foot sections.
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* The TBODY end tag may always be safely omitted.
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*
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* So the DTD is kind of wrong. The validator is, unfortunately, kind
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* of on crack.
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*
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* The definition changed again in XHTML1.1; and in my opinion, this
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* formulation makes the most sense.
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*
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* caption?, ( col* | colgroup* ), (( thead?, tfoot?, tbody+ ) | ( tr+ ))
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*
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* Essentially, we have two modes: thead/tfoot/tbody mode, and tr mode.
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* If we encounter a thead, tfoot or tbody, we are placed in the former
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* mode, and we *must* wrap any stray tr segments with a tbody. But if
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* we don't run into any of them, just have tr tags is OK.
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*/
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class HTMLPurifier_ChildDef_Table extends HTMLPurifier_ChildDef
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{
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public $allow_empty = false;
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public $type = 'table';
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public $elements = array('tr' => true, 'tbody' => true, 'thead' => true,
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'tfoot' => true, 'caption' => true, 'colgroup' => true, 'col' => true);
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public function __construct() {}
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public function validateChildren($tokens_of_children, $config, $context) {
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if (empty($tokens_of_children)) return false;
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// this ensures that the loop gets run one last time before closing
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// up. It's a little bit of a hack, but it works! Just make sure you
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// get rid of the token later.
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$tokens_of_children[] = false;
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// only one of these elements is allowed in a table
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$caption = false;
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$thead = false;
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$tfoot = false;
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// as many of these as you want
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$cols = array();
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$content = array();
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$nesting = 0; // current depth so we can determine nodes
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$is_collecting = false; // are we globbing together tokens to package
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// into one of the collectors?
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$collection = array(); // collected nodes
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$tag_index = 0; // the first node might be whitespace,
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// so this tells us where the start tag is
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$tbody_mode = false; // if true, then we need to wrap any stray
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// <tr>s with a <tbody>.
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foreach ($tokens_of_children as $token) {
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$is_child = ($nesting == 0);
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if ($token === false) {
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// terminating sequence started
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} elseif ($token instanceof HTMLPurifier_Token_Start) {
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$nesting++;
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} elseif ($token instanceof HTMLPurifier_Token_End) {
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$nesting--;
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}
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// handle node collection
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if ($is_collecting) {
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if ($is_child) {
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// okay, let's stash the tokens away
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// first token tells us the type of the collection
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switch ($collection[$tag_index]->name) {
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case 'tbody':
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$tbody_mode = true;
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case 'tr':
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$content[] = $collection;
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break;
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case 'caption':
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if ($caption !== false) break;
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$caption = $collection;
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break;
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case 'thead':
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case 'tfoot':
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$tbody_mode = true;
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// XXX This breaks rendering properties with
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// Firefox, which never floats a <thead> to
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// the top. Ever. (Our scheme will float the
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// first <thead> to the top.) So maybe
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// <thead>s that are not first should be
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// turned into <tbody>? Very tricky, indeed.
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// access the appropriate variable, $thead or $tfoot
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$var = $collection[$tag_index]->name;
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if ($$var === false) {
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$$var = $collection;
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} else {
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// Oops, there's a second one! What
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// should we do? Current behavior is to
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// transmutate the first and last entries into
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// tbody tags, and then put into content.
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// Maybe a better idea is to *attach
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// it* to the existing thead or tfoot?
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// We don't do this, because Firefox
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// doesn't float an extra tfoot to the
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// bottom like it does for the first one.
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$collection[$tag_index]->name = 'tbody';
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$collection[count($collection)-1]->name = 'tbody';
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$content[] = $collection;
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}
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break;
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case 'colgroup':
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$cols[] = $collection;
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break;
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}
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$collection = array();
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$is_collecting = false;
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$tag_index = 0;
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} else {
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// add the node to the collection
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$collection[] = $token;
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}
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}
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// terminate
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if ($token === false) break;
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if ($is_child) {
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// determine what we're dealing with
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if ($token->name == 'col') {
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// the only empty tag in the possie, we can handle it
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// immediately
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$cols[] = array_merge($collection, array($token));
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$collection = array();
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$tag_index = 0;
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continue;
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}
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switch($token->name) {
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case 'caption':
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case 'colgroup':
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case 'thead':
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case 'tfoot':
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case 'tbody':
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case 'tr':
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$is_collecting = true;
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$collection[] = $token;
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continue;
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default:
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if (!empty($token->is_whitespace)) {
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$collection[] = $token;
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$tag_index++;
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}
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continue;
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}
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}
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}
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if (empty($content)) return false;
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$ret = array();
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if ($caption !== false) $ret = array_merge($ret, $caption);
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if ($cols !== false) foreach ($cols as $token_array) $ret = array_merge($ret, $token_array);
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if ($thead !== false) $ret = array_merge($ret, $thead);
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if ($tfoot !== false) $ret = array_merge($ret, $tfoot);
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if ($tbody_mode) {
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// a little tricky, since the start of the collection may be
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// whitespace
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$inside_tbody = false;
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foreach ($content as $token_array) {
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// find the starting token
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foreach ($token_array as $t) {
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if ($t->name === 'tr' || $t->name === 'tbody') {
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break;
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}
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} // iterator variable carries over
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if ($t->name === 'tr') {
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if ($inside_tbody) {
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$ret = array_merge($ret, $token_array);
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} else {
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$ret[] = new HTMLPurifier_Token_Start('tbody');
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$ret = array_merge($ret, $token_array);
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$inside_tbody = true;
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}
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} elseif ($t->name === 'tbody') {
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if ($inside_tbody) {
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$ret[] = new HTMLPurifier_Token_End('tbody');
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$inside_tbody = false;
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$ret = array_merge($ret, $token_array);
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} else {
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$ret = array_merge($ret, $token_array);
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}
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} else {
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trigger_error("tr/tbody in content invariant failed in Table ChildDef", E_USER_ERROR);
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}
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}
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if ($inside_tbody) {
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$ret[] = new HTMLPurifier_Token_End('tbody');
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}
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} else {
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foreach ($content as $token_array) {
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// invariant: everything in here is <tr>s
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$ret = array_merge($ret, $token_array);
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}
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}
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if (!empty($collection) && $is_collecting == false){
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// grab the trailing space
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$ret = array_merge($ret, $collection);
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}
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array_pop($tokens_of_children); // remove phantom token
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return ($ret === $tokens_of_children) ? true : $ret;
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}
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}
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// vim: et sw=4 sts=4
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