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Force balance tags in news #82

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166 changes: 165 additions & 1 deletion wwwroot/includes/news.php
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,170 @@ function link_replace( $str ) {
return str_replace("https://springrts.com/", "/", $str);
}

/**
* Balances tags of string using a modified stack.
*
* @since 2.0.4
* @since 5.3.0 Improve accuracy and add support for custom element tags.
*
* @author Leonard Lin <[email protected]>
* @license GPL
* @copyright November 4, 2001
* @version 1.1
* @todo Make better - change loop condition to $text in 1.2
* @internal Modified by Scott Reilly (coffee2code) 02 Aug 2004
* 1.1 Fixed handling of append/stack pop order of end text
* Added Cleaning Hooks
* 1.0 First Version
*
* @param string $text Text to be balanced.
* @return string Balanced text.
*/
function force_balance_tags( $text ) {
$tagstack = array();
$stacksize = 0;
$tagqueue = '';
$newtext = '';
// Known single-entity/self-closing tags.
$single_tags = array( 'area', 'base', 'basefont', 'br', 'col', 'command', 'embed', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param', 'source', 'track', 'wbr' );
// Tags that can be immediately nested within themselves.
$nestable_tags = array( 'article', 'aside', 'blockquote', 'details', 'div', 'figure', 'object', 'q', 'section', 'span' );

// WP bug fix for comments - in case you REALLY meant to type '< !--'.
$text = str_replace( '< !--', '< !--', $text );
// WP bug fix for LOVE <3 (and other situations with '<' before a number).
$text = preg_replace( '#<([0-9]{1})#', '&lt;$1', $text );

/**
* Matches supported tags.
*
* To get the pattern as a string without the comments paste into a PHP
* REPL like `php -a`.
*
* @see https://html.spec.whatwg.org/#elements-2
* @see https://html.spec.whatwg.org/multipage/custom-elements.html#valid-custom-element-name
*
* @example
* ~# php -a
* php > $s = [paste copied contents of expression below including parentheses];
* php > echo $s;
*/
$tag_pattern = (
'#<' . // Start with an opening bracket.
'(/?)' . // Group 1 - If it's a closing tag it'll have a leading slash.
'(' . // Group 2 - Tag name.
// Custom element tags have more lenient rules than HTML tag names.
'(?:[a-z](?:[a-z0-9._]*)-(?:[a-z0-9._-]+)+)' .
'|' .
// Traditional tag rules approximate HTML tag names.
'(?:[\w:]+)' .
')' .
'(?:' .
// We either immediately close the tag with its '>' and have nothing here.
'\s*' .
'(/?)' . // Group 3 - "attributes" for empty tag.
'|' .
// Or we must start with space characters to separate the tag name from the attributes (or whitespace).
'(\s+)' . // Group 4 - Pre-attribute whitespace.
'([^>]*)' . // Group 5 - Attributes.
')' .
'>#' // End with a closing bracket.
);

while ( preg_match( $tag_pattern, $text, $regex ) ) {
$full_match = $regex[0];
$has_leading_slash = ! empty( $regex[1] );
$tag_name = $regex[2];
$tag = strtolower( $tag_name );
$is_single_tag = in_array( $tag, $single_tags, true );
$pre_attribute_ws = isset( $regex[4] ) ? $regex[4] : '';
$attributes = trim( isset( $regex[5] ) ? $regex[5] : $regex[3] );
$has_self_closer = '/' === substr( $attributes, -1 );

$newtext .= $tagqueue;

$i = strpos( $text, $full_match );
$l = strlen( $full_match );

// Clear the shifter.
$tagqueue = '';
if ( $has_leading_slash ) { // End tag.
// If too many closing tags.
if ( $stacksize <= 0 ) {
$tag = '';
// Or close to be safe $tag = '/' . $tag.

// If stacktop value = tag close value, then pop.
} elseif ( $tagstack[ $stacksize - 1 ] === $tag ) { // Found closing tag.
$tag = '</' . $tag . '>'; // Close tag.
array_pop( $tagstack );
$stacksize--;
} else { // Closing tag not at top, search for it.
for ( $j = $stacksize - 1; $j >= 0; $j-- ) {
if ( $tagstack[ $j ] === $tag ) {
// Add tag to tagqueue.
for ( $k = $stacksize - 1; $k >= $j; $k-- ) {
$tagqueue .= '</' . array_pop( $tagstack ) . '>';
$stacksize--;
}
break;
}
}
$tag = '';
}
} else { // Begin tag.
if ( $has_self_closer ) { // If it presents itself as a self-closing tag...
// ...but it isn't a known single-entity self-closing tag, then don't let it be treated as such
// and immediately close it with a closing tag (the tag will encapsulate no text as a result).
if ( ! $is_single_tag ) {
$attributes = trim( substr( $attributes, 0, -1 ) ) . "></$tag";
}
} elseif ( $is_single_tag ) { // Else if it's a known single-entity tag but it doesn't close itself, do so.
$pre_attribute_ws = ' ';
$attributes .= '/';
} else { // It's not a single-entity tag.
// If the top of the stack is the same as the tag we want to push, close previous tag.
if ( $stacksize > 0 && ! in_array( $tag, $nestable_tags, true ) && $tagstack[ $stacksize - 1 ] === $tag ) {
$tagqueue = '</' . array_pop( $tagstack ) . '>';
$stacksize--;
}
$stacksize = array_push( $tagstack, $tag );
}

// Attributes.
if ( $has_self_closer && $is_single_tag ) {
// We need some space - avoid <br/> and prefer <br />.
$pre_attribute_ws = ' ';
}

$tag = '<' . $tag . $pre_attribute_ws . $attributes . '>';
// If already queuing a close tag, then put this tag on too.
if ( ! empty( $tagqueue ) ) {
$tagqueue .= $tag;
$tag = '';
}
}
$newtext .= substr( $text, 0, $i ) . $tag;
$text = substr( $text, $i + $l );
}

// Clear tag queue.
$newtext .= $tagqueue;

// Add remaining text.
$newtext .= $text;

while ( $x = array_pop( $tagstack ) ) {
$newtext .= '</' . $x . '>'; // Add remaining tags to close.
}

// WP fix for the bug with HTML comments.
$newtext = str_replace( '< !--', '<!--', $newtext );
$newtext = str_replace( '< !--', '< !--', $newtext );

return $newtext;
}

function get_news($db) {
$sql = "SELECT t.topic_id, topic_poster, p.post_text, u.username, u.user_email, t.topic_time, t.topic_posts_approved, t.topic_title, t.forum_id
FROM phpbb3_topics AS t, phpbb3_users AS u, phpbb3_posts AS p
Expand Down Expand Up @@ -47,7 +211,7 @@ function get_news($db) {
}
$postlink = '/phpbb/viewtopic.php?t=' . $row['topic_id'] ;
$title = makelink($postlink, $title);
$newstext = link_replace(parse_bbcode($row['post_text']));
$newstext = link_replace(force_balance_tags(parse_bbcode($row['post_text'])));
$poster = $row['username'];
$postdate = date("Y-m-d H:i", $row['topic_time']);
$newsdata = array( $title, $newstext, $poster, $postdate);
Expand Down