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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
*/
/**
* @todo document, briefly.
* @ingroup Parser
*/
class StripState {
protected $prefix;
protected $data;
protected $regex;
protected $tempType, $tempMergePrefix;
protected $circularRefGuard;
protected $recursionLevel = 0;
const UNSTRIP_RECURSION_LIMIT = 20;
/**
* @param string|null $prefix
* @since 1.26 The prefix argument should be omitted, as the strip marker
* prefix string is now a constant.
*/
public function __construct( $prefix = null ) {
if ( $prefix !== null ) {
wfDeprecated( __METHOD__ . ' with called with $prefix argument' .
' (call with no arguments instead)', '1.26' );
}
$this->data = [
'nowiki' => [],
'general' => []
];
$this->regex = '/' . Parser::MARKER_PREFIX . "([^\x7f]+)" . Parser::MARKER_SUFFIX . '/';
$this->circularRefGuard = [];
}
/**
* Add a nowiki strip item
* @param string $marker
* @param string $value
*/
public function addNoWiki( $marker, $value ) {
$this->addItem( 'nowiki', $marker, $value );
}
/**
* @param string $marker
* @param string $value
*/
public function addGeneral( $marker, $value ) {
$this->addItem( 'general', $marker, $value );
}
/**
* @throws MWException
* @param string $type
* @param string $marker
* @param string $value
*/
protected function addItem( $type, $marker, $value ) {
if ( !preg_match( $this->regex, $marker, $m ) ) {
throw new MWException( "Invalid marker: $marker" );
}
$this->data[$type][$m[1]] = $value;
}
/**
* @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
* @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;
}
$oldType = $this->tempType;
$this->tempType = $type;
$text = preg_replace_callback( $this->regex, [ $this, 'unstripCallback' ], $text );
$this->tempType = $oldType;
return $text;
}
/**
* @param array $m
* @return array
*/
protected function unstripCallback( $m ) {
$marker = $m[1];
if ( isset( $this->data[$this->tempType][$marker] ) ) {
if ( isset( $this->circularRefGuard[$marker] ) ) {
return '<span class="error">'
. wfMessage( 'parser-unstrip-loop-warning' )->inContentLanguage()->text()
. '</span>';
}
if ( $this->recursionLevel >= self::UNSTRIP_RECURSION_LIMIT ) {
return '<span class="error">' .
wfMessage( 'parser-unstrip-recursion-limit' )
->numParams( self::UNSTRIP_RECURSION_LIMIT )->inContentLanguage()->text() .
'</span>';
}
$this->circularRefGuard[$marker] = true;
$this->recursionLevel++;
$value = $this->data[$this->tempType][$marker];
if ( $value instanceof Closure ) {
$value = $value();
}
$ret = $this->unstripType( $this->tempType, $value );
$this->recursionLevel--;
unset( $this->circularRefGuard[$marker] );
return $ret;
} else {
return $m[0];
}
}
/**
* Get a StripState object which is sufficient to unstrip the given text.
* It will contain the minimum subset of strip items necessary.
*
* @param string $text
*
* @return StripState
*/
public function getSubState( $text ) {
$subState = new StripState();
$pos = 0;
while ( true ) {
$startPos = strpos( $text, Parser::MARKER_PREFIX, $pos );
$endPos = strpos( $text, Parser::MARKER_SUFFIX, $pos );
if ( $startPos === false || $endPos === false ) {
break;
}
$endPos += strlen( Parser::MARKER_SUFFIX );
$marker = substr( $text, $startPos, $endPos - $startPos );
if ( !preg_match( $this->regex, $marker, $m ) ) {
continue;
}
$key = $m[1];
if ( isset( $this->data['nowiki'][$key] ) ) {
$subState->data['nowiki'][$key] = $this->data['nowiki'][$key];
} elseif ( isset( $this->data['general'][$key] ) ) {
$subState->data['general'][$key] = $this->data['general'][$key];
}
$pos = $endPos;
}
return $subState;
}
/**
* Merge another StripState object into this one. The strip marker keys
* will not be preserved. The strings in the $texts array will have their
* strip markers rewritten, the resulting array of strings will be returned.
*
* @param StripState $otherState
* @param array $texts
* @return array
*/
public function merge( $otherState, $texts ) {
$mergePrefix = wfRandomString( 16 );
foreach ( $otherState->data as $type => $items ) {
foreach ( $items as $key => $value ) {
$this->data[$type]["$mergePrefix-$key"] = $value;
}
}
$this->tempMergePrefix = $mergePrefix;
$texts = preg_replace_callback( $otherState->regex, [ $this, 'mergeCallback' ], $texts );
$this->tempMergePrefix = null;
return $texts;
}
/**
* @param array $m
* @return string
*/
protected function mergeCallback( $m ) {
$key = $m[1];
return Parser::MARKER_PREFIX . $this->tempMergePrefix . '-' . $key . Parser::MARKER_SUFFIX;
}
/**
* Remove any strip markers found in the given text.
*
* @param string $text Input string
* @return string
*/
public function killMarkers( $text ) {
return preg_replace( $this->regex, '', $text );
}
}