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lib_wiki.php
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lib_wiki.php
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<?php
define('TLB_WIKI_SLUG_HOME_PAGE', 'WelcomeWikiVisitors');
function wiki_camel_to_spaced(string $str = null) : ?string
{
if ($str === null)
return null;
return preg_replace('/([a-z\\p{Ll}])([A-Z\\p{Lu}])/u', '\\1 \\2', $str);
}
function wiki_slug_to_title(string $slug) : string
{
return wiki_camel_to_spaced($slug);
}
function wiki_posts_readable_by_slugP(string $slug, string $subslug = null) : bool
{
$DB = db_pdo();
if ($subslug !== null)
return count($DB->queryFetchAll('SELECT slug FROM post_wiki_note_dated WHERE slug = ? AND date = ? LIMIT 1', [ $slug, $subslug ])) > 0;
return count($DB->queryFetchAll('SELECT _url_slug FROM post_wiki WHERE _url_slug = ? LIMIT 1', [ $slug ])) > 0;
}
function wiki_maintenance_refresh_slug_reverse_index_formH() : string
{
$action_name = 'Refresh slug reverse index';
return '
<form method="post" action="?set=post_wiki&slug=TlbWikiReverseSlugIndex&service=TlbWikiReverseSlugIndex">
<button name="action" value="rebuild-slug-reverse-index" class="strut-12">' .H($action_name) .'</button>
</form>';
}
function wiki_slug_re() : string
{
return '#\\b([A-Z\\p{Lu}][a-z\\p{Ll}]+([A-Z\\p{Lu}][a-z\\p{Ll}]+)+)([/]([0-9-]+))?\\b#u';
}
# careful: it's not "IS" this a slug, but rather *does it contain* a slug
# due to missing start, end anchors
function wiki_contains_slugP(string $slug_candidate) : bool
{
return preg_match(wiki_slug_re(), $slug_candidate, $matches);
}
function wiki_slug_to_linkH(string $slug, string $value_override = null) : string
{
$value = $value_override ?? $slug;
if (wiki_posts_readable_by_slugP($slug))
return '<a href="?set=post_wiki&slug=' .HU($slug) .'">' .H($value) .'</a>';
else
return '<a href="?set=post_wiki&slug=' .HU($slug) .'" class="broken-link">' .H($value) .'</a>';
}
function wiki_encode_html(string $str, array $data) : array
{
return [ H($str), $data ];
}
# https://tools.ietf.org/html/rfc3986#section-2.2
function wiki_href_re() : string { return '`(https?://[][a-zA-Z0-9-._~:/?#@!$&\'()*+,;=%]+([.]jpe?g|[.]gif|[.]png|[.]svg))|(https?://[a-zA-Z0-9-._~:/?#@!$&\'()*+,;=%]+)`'; }
function wiki_links(string $str, array $data) : array # [ $a, $data ]
{
$DC = function(string $str) : string
{
return str_replace('%%', '%', $str);
};
$str = preg_replace_callback(
wiki_href_re(),
function(array $matches) use(&$data, $DC) : string
{
if ($matches[2]??null)
$data[] = '<img src="' .H($DC($matches[1])) .'">';
else
$data[] = '<a href="' .H($DC($matches[3])) .'">' .H($DC($matches[3])) .'</a>';
return '%' .count($data) .'$s';
},
$str );
return [ $str, $data ];
}
function wiki_slugs_to_links(string $str, array $data) : array # [ $a, $data, $slugs ]
{
$slugs = [];
$str = preg_replace_callback(wiki_slug_re(),
function(array $matches) use(&$data, &$slugs)
{
$slugs[] = $slug = $matches[1];
$subslug = $matches[4]??null;
if ($subslug === null)
$hxU = $cx = null;
else
[ $hxU, $cx ] = [ 'subslug=' .U($matches[4]), '/' .$matches[4] ];
if (wiki_posts_readable_by_slugP($slug, $subslug))
$data[] = '<a href="?set=post_wiki&slug=' .HU($slug) .'&' .H($hxU) .'">' .H($slug .$cx) .'</a>';
else
$data[] = '<a href="?set=post_wiki&slug=' .HU($slug) .'&' .H($hxU) .'" class="broken-link">' .H($slug .$cx) .'</a>';
return '%' .(count($data)) .'$s';
},
$str );
return [ $str, $data, $slugs ];
}
function wiki_linear_formatting(string $str, array $data) : array # [ $a, $data ]
{
$DC = function(string $str) { return str_replace('%%', '%', $str); };
$str = preg_replace_callback(
"/`([^`]+)`/U",
function ($matches) use(&$data, $DC)
{
$data[] = '<code>';
$data[] = H($DC($matches[1]));
$data[] = '</code>';
return '%' .(count($data)-2) .'$s' .'%' .(count($data)-1) .'$s' .'%' .count($data) .'$s';
},
$str );
$str = preg_replace_callback(
"/'''(.*)'''/U",
function ($matches) use(&$data)
{
$data[] = '<b>';
$data[] = '</b>';
return '%' .(count($data)-1) .'$s' .$matches[1] .'%' .count($data) .'$s';
},
$str );
$str = preg_replace_callback(
"/''(.*)''/U",
function ($matches) use(&$data)
{
$data[] = '<em>';
$data[] = '</em>';
return '%' .(count($data)-1) .'$s' .$matches[1] .'%' .count($data) .'$s';
},
$str );
$str = preg_replace_callback(
"/~~(.*)~~/U",
function ($matches) use(&$data)
{
$data[] = '<strike>';
$data[] = '</strike>';
return '%' .(count($data)-1) .'$s' .$matches[1] .'%' .count($data) .'$s';
},
$str );
return [ $str, $data ];
}
function wiki_block_formatting(string $str, array $data) : array # [ $a, $data ]
{
$ret = [];
$p = null;
$DC = function(string $str) { return str_replace('%%', '%', $str); };
$ctx = function($v = null) : ?string
{
static $c;
$old = $c;
if ($v === -1) {
$c = null;
if ($old)
return "</$old>\n";
else
return null; }
if ($v !== null)
$c = $v;
if ($v !== $old) {
if ($old)
return "\n</$old >\n<$c>\n";
else
return "<$c>\n"; }
return null;
};
# wait what?
$uLL = function(int $level = 0) : ?string
{
static $u = 0;
$a = [];
$level *= 2;
$lowered = false;
if ($u)
if ($level <= $u)
$a[] = "</li>";
if ($level)
if ($level === $u)
$a[] = str_repeat("\t", max($u-1, 0)) ."<li class=t1>";
while ($level > $u) {
$a[] = "\n" .str_repeat("\t", $u++) ."<ul>";
$a[] = str_repeat("\t", $u++) ."<li>"; }
$tt = "";
while ($level < $u) {
$lowered = true;
$a[] = str_repeat("\t", ($u-- -2)) ."</ul>";
if ($u>1)
$a[] = str_repeat("\t", ($u-- -2)) ."</li>";
else
$u--;
}
if ($lowered)
if ($level)
{
$a[] = str_repeat("\t", $level-1) ."<li class=t9>";
}
if ($lowered && !$level)
$a[] = '';
if (empty($a))
return null;
return implode("\n", $a);
};
$P = function(string $str = null) use(&$data) : ?string
{
if ($str === null)
return null;
$data[] = $str;
return '%' .count($data) .'$s';
};
foreach (explode("\n", $str) as $line) {
if ($line === '') {
$ret[] = $P($uLL(0));
$ret[] = $P($ctx(-1)); }
if (preg_match('/^-{4,}(.*)/', $line, $matches)) {
$ret[] = $P($uLL(0));
$ret[] = $P($ctx(-1));
$line = $matches[1];
$ret[] = $P("<hr>\n"); }
# <ul>
if (preg_match('/^([*]+)(.*)/', $line, $matches)) {
$ret[] = $P($ctx(-1));
$ret[] = $P($uLL($level = strlen($matches[1])))
.$matches[2];
$line = null; continue; }
# <h2 ... h6>
if (preg_match('/^(={1,})(.+)/', $line, $matches)) {
$ret[] = $P($ctx(-1));
$ret[] = $P('<h' .(strlen($matches[1])+1) .'>');
$ret[] = $matches[2];
$ret[] = $P('</h' .(strlen($matches[1])+1) .'>');
$line = null; continue; }
# <dl>
# empty <dt> serves as quotation
if (false
|| preg_match("/^[\t]([^:]+):[\t ](.*)/", $line, $matches)
|| preg_match("/^[ ]{4,4}([^:]+):[\t ](.*)/", $line, $matches)
|| preg_match("/^[ ]([ ]):[ ](.*)/", $line, $matches)) {
$ret[] = $P($uLL(0));
$ret[] = $P($ctx('dl'));
$p = 0;
$ret[] = $P("<dt>");
$ret[] = $matches[1];
$ret[] = $P("</dt>\n\t<dd>");
# FixMe - <dd> is a flow element, we should handle that properly
$ret[] = $matches[2];
$ret[] = $P("</dd>\n");
$line = null; continue; }
# <pre>
if (preg_match('/^([ \\t].+)/', $line, $matches)) {
$ret[] = $P($uLL(0));
$ret[] = $P($ctx('pre') .H($DC($matches[1])));
$line = null; continue; }
if ($line) {
$ret[] = $P($ctx('p'));
$ret[] = $line ."\n"; } }
$ret[] = $P($uLL(0));
$ret[] = $P($ctx(-1));
return [ implode("\n", array_filter($ret, function($v) { return !is_null($v); })), $data ];
}
function wiki_post_body_to_htmlH(string $body) : string
{
return _wiki_post_body_processing($body)[0];
}
function wiki_post_body_to_slugs(string $body) : array
{
return array_unique(_wiki_post_body_processing($body)[1]);
}
function _wiki_post_body_processing(string $body) : array # [ string $html, array $slugs ]
{
$preescape = function(string $str) { return str_replace('%', '%%', $str); };
$XAPPLY = function(string $str, array $data, string $callback) : array /* [ $str, $data ] */
{
$a = $callback($str, $data);
[$str, $newdata] = $a;
$data = $data + $newdata;
$a[0] = $str;
$a[1] = $data;
return $a;
};
$str = $preescape($body);
$data = [];
[ $str, $data ] = $XAPPLY($str, $data, 'wiki_block_formatting');
[ $str, $data ] = $XAPPLY($str, $data, 'wiki_linear_formatting');
[ $str, $data ] = $XAPPLY($str, $data, 'wiki_links');
[ $str, $data, $slugs ] = $XAPPLY($str, $data, 'wiki_slugs_to_links');
[ $str, $data ] = $XAPPLY($str, $data, 'wiki_encode_html');
return [ vsprintf($str, $data), $slugs ];
}
function wiki_maintenance_rebuild_slug_reverse_index()
{
$DB = db_pdo();
$DB->beginTransaction();
$DB->exec('DELETE FROM _wiki_slug_use');
$a = $DB->queryFetchAll('SELECT * FROM wiki');
$St = $DB->prepare('INSERT INTO _wiki_slug_use (from_slug, to_slug) VALUES (?, ?)');
foreach ($a as $rcd)
foreach (wiki_post_body_to_slugs($rcd['body']) as $slug)
$St->execute([ $rcd['slug'], $slug ]);
$DB->commit();
}
function wiki_post_meta(array $rcd) : string
{
return sprintf('Wiki page for %s',
$rcd['_url_slug'] );
}
function wiki_connection_post_url(string $connection, string $slug) : string
{
$curl = tlb_connection_url($connection);
return $curl .'?set=post_wiki&slug=' .U($slug);
}
function wiki_rcd(string $slug) : array /* a record */
{
return db_pdo()->queryFetchOne('SELECT * FROM wiki WHERE slug = ? ', [ $slug ]);
}
function wiki_rcd_relevant_from_connection(string $connection, string $_url_slug) : array
{
if ($connection === tlb_address())
return wiki_rcd($_url_slug);
$curl = tlb_connection_url($connection);
$url = $curl .'/wiki-text.php?slug=' .U($_url_slug);
$body = tlb_download_connection($url);
return compact('_url_slug', 'body');
}
function wiki_reverse_index_from_connection(string $connection, string $_url_slug) : array
{
$curl = tlb_connection_url($connection);
$url = $curl .'/wiki-reverse-index.php?slug=' .U($_url_slug);
$slugA = array_filter(explode(',', tlb_download_connection($url)), 'strlen');
$body = null;
return array_map(
function($slug) use($body) { return compact('slug', 'body'); },
$slugA );
}
function wiki_edit_conflict($post_data, $post_original, $latest)
{
die('edit conflict');
}
function wiki_article_body_redirect_slug(string $body) : ?string
{
$slug1 = preg_match('#^redirect:(.+)#', $body, $matches1)
? $matches1[1]
: null;
preg_match(wiki_slug_re(), $slug1, $matches2);
return (($matches2[0]??null) === ($matches2[1]??-1))
? $slug1
: null;
}