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<?php
/**
* Holder for stripped items when parsing wiki markup.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Parser
*/
namespace MediaWiki\Parser;
use Closure;
use InvalidArgumentException;
use Wikimedia\Parsoid\Fragments\PFragment;
/**
* @todo document, briefly.
* @newable
* @ingroup Parser
*/
class StripState {
/** @var array[] */
protected $data;
/** @var array[] */
protected $extra;
/** @var string */
protected $regex;
protected ?Parser $parser;
/** @var array */
protected $circularRefGuard;
/** @var int */
protected $depth = 0;
/** @var int */
protected $highestDepth = 0;
/** @var int */
protected $expandSize = 0;
/** @var int */
protected $depthLimit = 20;
/** @var int */
protected $sizeLimit = 5_000_000;
/**
* @stable to call
*
* @param Parser|null $parser
* @param array $options
*/
public function __construct( ?Parser $parser = null, $options = [] ) {
$this->data = [
'nowiki' => [],
'general' => []
];
$this->extra = [];
$this->regex = '/' . Parser::MARKER_PREFIX . "([^\x7f<>&'\"]+)" . Parser::MARKER_SUFFIX . '/';
$this->circularRefGuard = [];
$this->parser = $parser;
if ( isset( $options['depthLimit'] ) ) {
$this->depthLimit = $options['depthLimit'];
}
if ( isset( $options['sizeLimit'] ) ) {
$this->sizeLimit = $options['sizeLimit'];
}
}
/**
* Add a nowiki strip item
* @param string $marker
* @param string|Closure $value
* @param ?string $extra Used to distinguish items added by <nowiki>
* from items added by other mechanisms.
*/
public function addNoWiki( $marker, $value, ?string $extra = null ) {
$this->addItem( 'nowiki', $marker, $value, $extra );
}
/**
* @param string $marker
* @param string|Closure $value
*/
public function addGeneral( $marker, $value ) {
$this->addItem( 'general', $marker, $value );
}
/**
* @param string $marker
* @param string|Closure $value
* @since 1.44
* @internal Parsoid use only.
*/
public function addExtTag( $marker, $value ) {
$this->addItem( 'exttag', $marker, $value );
}
/**
* @param string $marker
* @param PFragment $extra
* @since 1.44
* @internal Parsoid use only.
*/
public function addParsoidOpaque( $marker, PFragment $extra ) {
$this->addItem( 'parsoid', $marker, '<parsoid opaque>', $extra );
}
/**
* @param string $type
* @param-taint $type none
* @param string $marker
* @param-taint $marker none
* @param string|Closure $value
* @param string|PFragment|null $extra
* @param-taint $value exec_html
*/
protected function addItem( $type, $marker, $value, $extra = null ) {
if ( !preg_match( $this->regex, $marker, $m ) ) {
throw new InvalidArgumentException( "Invalid marker: $marker" );
}
$this->data[$type][$m[1]] = $value;
if ( $extra !== null ) {
$this->extra[$type][$m[1]] = $extra;
}
}
/**
* @param string $text
* @return mixed
*/
public function unstripGeneral( $text ) {
return $this->unstripType( 'general', $text );
}
/**
* @param string $text
* @return mixed
*/
public function unstripNoWiki( $text ) {
return $this->unstripType( 'nowiki', $text );
}
/**
* @param string $text
* @param callable $callback
* @return string
* @unstable Temporarily used by Scribunto
*/
public function replaceNoWikis( string $text, callable $callback ): string {
// Shortcut
if ( !count( $this->data['nowiki'] ) ) {
return $text;
}
$callback = function ( $m ) use ( $callback ) {
$marker = $m[1];
if ( isset( $this->data['nowiki'][$marker] ) ) {
$value = $this->data['nowiki'][$marker];
if ( $value instanceof Closure ) {
$value = $value();
}
$this->expandSize += strlen( $value );
if ( $this->expandSize > $this->sizeLimit ) {
return $this->getLimitationWarning( 'unstrip-size', $this->sizeLimit );
}
return $callback( $value );
} else {
return $m[0];
}
};
return preg_replace_callback( $this->regex, $callback, $text );
}
/**
* Split the given text by strip markers, returning an array
* of [ 'type' => ..., 'content' => ... ] elements. The type
* property is:
* - 'string' for plain strings and 'exttag' strip markers
* - otherwise, name of the strip marker that generated the 'content' value
* @return array<string|array{type:string,content:string}>
*/
public function split( string $text ): array {
$result = [];
$pieces = preg_split( $this->regex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
for ( $i = 0; $i < count( $pieces ); $i++ ) {
if ( $i % 2 === 0 ) {
$result[] = [
'type' => 'string',
'content' => $pieces[$i],
];
continue;
}
$marker = $pieces[$i];
foreach ( $this->data as $type => $items ) {
if ( isset( $items[$marker] ) ) {
$value = $items[$marker];
$extra = $this->extra[$type][$marker] ?? null;
if ( $value instanceof Closure ) {
$value = $value();
}
if ( $type === 'exttag' ) {
// Catch circular refs / enforce depth limits
// similar to code in unstripType().
if ( isset( $this->circularRefGuard[$marker] ) ) {
$result[] = [
'type' => 'string',
'content' => $this->getWarning( 'parser-unstrip-loop-warning' )
];
continue;
}
if ( $this->depth > $this->highestDepth ) {
$this->highestDepth = $this->depth;
}
if ( $this->depth >= $this->depthLimit ) {
$result[] = [
'type' => 'string',
'content' => $this->getLimitationWarning( 'unstrip-depth', $this->depthLimit )
];
continue;
}
// For exttag types, the output size should include the output of
// the extension, but don't think unstripType is doing that, and so
// we aren't doing that either here. But this is kinda broken.
// See T380758#10355050.
$this->expandSize += strlen( $value );
if ( $this->expandSize > $this->sizeLimit ) {
$result[] = [
'type' => 'string',
'content' => $this->getLimitationWarning( 'unstrip-size', $this->sizeLimit )
];
continue;
}
$this->circularRefGuard[$marker] = true;
$this->depth++;
$result = array_merge( $result, $this->split( $value ) );
$this->depth--;
unset( $this->circularRefGuard[$marker] );
} else {
$result[] = [
'type' => $type,
'content' => $value,
'extra' => $extra,
'marker' => Parser::MARKER_PREFIX . $marker . Parser::MARKER_SUFFIX,
];
}
continue 2;
}
}
$result[] = [
'type' => 'unknown',
'content' => null,
'marker' => Parser::MARKER_PREFIX . $marker . Parser::MARKER_SUFFIX,
];
}
return $result;
}
/**
* @param string $text
* @return mixed
*/
public function unstripBoth( $text ) {
$text = $this->unstripType( 'general', $text );
$text = $this->unstripType( 'nowiki', $text );
return $text;
}
/**
* @param string $type
* @param string $text
* @return mixed
*/
protected function unstripType( $type, $text ) {
// Shortcut
if ( !count( $this->data[$type] ) ) {
return $text;
}
$callback = function ( $m ) use ( $type ) {
$marker = $m[1];
if ( isset( $this->data[$type][$marker] ) ) {
if ( isset( $this->circularRefGuard[$marker] ) ) {
return $this->getWarning( 'parser-unstrip-loop-warning' );
}
if ( $this->depth > $this->highestDepth ) {
$this->highestDepth = $this->depth;
}
if ( $this->depth >= $this->depthLimit ) {
return $this->getLimitationWarning( 'unstrip-depth', $this->depthLimit );
}
$value = $this->data[$type][$marker];
if ( $value instanceof Closure ) {
$value = $value();
}
$this->expandSize += strlen( $value );
if ( $this->expandSize > $this->sizeLimit ) {
return $this->getLimitationWarning( 'unstrip-size', $this->sizeLimit );
}
$this->circularRefGuard[$marker] = true;
$this->depth++;
$ret = $this->unstripType( $type, $value );
$this->depth--;
unset( $this->circularRefGuard[$marker] );
return $ret;
} else {
return $m[0];
}
};
$text = preg_replace_callback( $this->regex, $callback, $text );
return $text;
}
/**
* Get warning HTML and register a limitation warning with the parser
*
* @param string $type
* @param int|string $max
* @return string
*/
private function getLimitationWarning( $type, $max = '' ) {
if ( $this->parser ) {
$this->parser->limitationWarn( $type, $max );
}
return $this->getWarning( "$type-warning", $max );
}
/**
* Get warning HTML
*
* @param string $message
* @param int|string $max
* @return string
*/
private function getWarning( $message, $max = '' ) {
return '<span class="error">' .
wfMessage( $message )
->numParams( $max )->inContentLanguage()->text() .
'</span>';
}
/**
* Get an array of parameters to pass to ParserOutput::setLimitReportData()
*
* @internal Should only be called by Parser
* @return array
*/
public function getLimitReport() {
return [
[ 'limitreport-unstrip-depth',
[
$this->highestDepth,
$this->depthLimit
],
],
[ 'limitreport-unstrip-size',
[
$this->expandSize,
$this->sizeLimit
],
]
];
}
/**
* Remove any strip markers found in the given text.
*
* @param string $text
* @return string
*/
public function killMarkers( $text ) {
return preg_replace( $this->regex, '', $text );
}
}
/** @deprecated class alias since 1.43 */
class_alias( StripState::class, 'StripState' );