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<?php
/**
* RegexFunctions extension -- Regular Expression parser functions
*
* @file
* @ingroup Extensions
* @author Ryan Schmidt
* @license http://en.wikipedia.org/wiki/Public_domain Public domain
* @link http://www.mediawiki.org/wiki/Extension:RegexFunctions Documentation
*/
if( !defined( 'MEDIAWIKI' ) ) {
echo "This file is an extension of the MediaWiki software and cannot be used standalone\n";
die( 1 );
}
// Extension credits that will show up on Special:Version
$wgExtensionCredits['parserhook'][] = array(
'path' => __FILE__,
'name' => 'RegexFunctions',
'author' => 'Ryan Schmidt',
'version' => '1.5.0',
'descriptionmsg' => 'regexfunctions-desc',
'url' => 'https://www.mediawiki.org/wiki/Extension:RegexFunctions',
);
$dir = dirname( __FILE__ ) . '/';
$wgMessagesDirs['RegexFunctions'] = __DIR__ . '/i18n';
$wgExtensionMessagesFiles['RegexFunctions'] = $dir . 'RegexFunctions.i18n.php';
$wgExtensionMessagesFiles['RegexFunctionsMagic'] = $dir . 'RegexFunctions.i18n.magic.php';
$wgHooks['ParserFirstCallInit'][] = 'ExtRegexFunctions::onParserFirstCallInit';
$wgHooks['ParserClearState'][] = 'ExtRegexFunctions::onParserClearState';
// default globals
// how many functions are allowed in a single page? Keep this at least above 3 for usability
$wgRegexFunctionsPerPage = 10;
// should we allow modifiers in the functions, e.g. the /i modifier for case-insensitive?
$wgRegexFunctionsAllowModifiers = true;
// should we allow internal options to be set (e.g. (?opts) or (?opts:some regex))
$wgRegexFunctionsAllowOptions = true;
// limit for rsplit and rreplace functions. -1 is unlimited
$wgRegexFunctionsLimit = -1;
// array of functions to disable, aka these functions cannot be used :)
$wgRegexFunctionsDisable = array();
class ExtRegexFunctions {
private static $num = 0;
private static $modifiers = array(
'i', 'm', 's', 'x', 'A', 'D', 'S', 'U', 'X', 'J', 'u', 'e'
);
private static $options = array( 'i', 'm', 's', 'x', 'U', 'X', 'J' );
public static function onParserFirstCallInit( $parser ) {
$parser->setFunctionHook( 'rmatch', array( __CLASS__, 'rmatch' ) );
$parser->setFunctionHook( 'rsplit', array( __CLASS__, 'rsplit' ) );
$parser->setFunctionHook( 'rreplace', array( __CLASS__, 'rreplace' ) );
return true;
}
public static function onParserClearState( $parser ) {
self::$num = 0;
return true;
}
public static function rmatch( &$parser, $string = '', $pattern = '', $return = '', $notfound = '', $offset = 0 ) {
global $wgRegexFunctionsPerPage, $wgRegexFunctionsAllowModifiers, $wgRegexFunctionsDisable;
if( in_array( 'rmatch', $wgRegexFunctionsDisable ) ) {
return;
}
self::$num++;
if( self::$num > $wgRegexFunctionsPerPage ) {
return;
}
$pattern = self::sanitize(
$pattern,
$wgRegexFunctionsAllowModifiers
);
$num = preg_match(
$pattern, $string, $matches, PREG_OFFSET_CAPTURE, (int) $offset
);
if ( $num === false ) {
return;
}
if ( $num === 0 ) {
if ( $notfound == '$0' ) {
//Return the original string if specified to display it with $0.
return $string;
}
return $notfound;
}
// change all backslashes to $
$return = str_replace( '\\', '%$', $return );
$return = preg_replace_callback(
'/%?\$%?\$([0-9]+)/',
function ( $_callbackMatches ) use ( $matches ) {
return array_key_exists($_callbackMatches[1], $matches) ? $matches[$_callbackMatches[1]][1] : '';
},
$return
);
$return = preg_replace_callback(
'/%?\$%?\$\{([0-9]+)\}/',
function ( $_callbackMatches ) use ( $matches ) {
return array_key_exists($_callbackMatches[1], $matches) ? $matches[$_callbackMatches[1]][1] : '';
},
$return
);
$return = preg_replace_callback(
'/%?\$([0-9]+)/',
function ( $_callbackMatches ) use ( $matches ) {
return array_key_exists($_callbackMatches[1], $matches) ? $matches[$_callbackMatches[1]][0] : '';
},
$return
);
$return = preg_replace_callback(
'/%?\$\{([0-9]+)\}/',
function ( $_callbackMatches ) use ( $matches ) {
return array_key_exists($_callbackMatches[1], $matches) ? $matches[$_callbackMatches[1]][0] : '';
},
$return
);
$return = str_replace( '%$', '\\', $return );
return $return;
}
public static function rsplit( &$parser, $string = '', $pattern = '', $piece = 0 ) {
global $wgRegexFunctionsPerPage, $wgRegexFunctionsAllowModifiers, $wgRegexFunctionsLimit, $wgRegexFunctionsDisable;
if( in_array( 'rsplit', $wgRegexFunctionsDisable ) ) {
return;
}
self::$num++;
if( self::$num > $wgRegexFunctionsPerPage ) {
return;
}
$pattern = self::sanitize(
$pattern,
$wgRegexFunctionsAllowModifiers
);
$res = preg_split( $pattern, $string, $wgRegexFunctionsLimit );
$p = (int) $piece;
// allow negative pieces to work from the end of the array
if( $p < 0 ) {
$p = $p + count( $res );
}
// sanitation for pieces that don't exist
if( $p < 0 ) {
$p = 0;
}
if( $p >= count( $res ) ) {
$p = count( $res ) - 1;
}
return $res[$p];
}
public static function rreplace( &$parser, $string = '', $pattern = '', $replace = '' ) {
global $wgRegexFunctionsPerPage, $wgRegexFunctionsAllowModifiers, $wgRegexFunctionsLimit, $wgRegexFunctionsDisable;
if( in_array( 'rreplace', $wgRegexFunctionsDisable ) ) {
return;
}
self::$num++;
if( self::$num > $wgRegexFunctionsPerPage ) {
return;
}
$pattern = self::sanitize(
str_replace(chr(0), '', $pattern),
$wgRegexFunctionsAllowModifiers
);
$res = preg_replace(
$pattern,
$replace,
$string,
$wgRegexFunctionsLimit
);
return $res;
}
// santizes a regex pattern
private static function sanitize( $pattern, $m = false ) {
if( preg_match( '/^\/(.*)([^\\\\])\/(.*?)$/', $pattern, $matches ) ) {
$pat = preg_replace_callback(
'/([^\\\\])?\(\?(.*\:)?(.*)\)/U',
function ( $_callbackMatches ) {
return "{$_callbackMatches[1]}(" . self::cleanupInternal( $_callbackMatches[2] ) . "{$_callbackMatches[3]})";
},
$matches[1] . $matches[2]
);
$ret = '/' . $pat . '/';
if( $m ) {
$mod = '';
foreach( self::$modifiers as $val ) {
if( strpos( $matches[3], $val ) !== false ) {
$mod .= $val;
}
}
$mod = str_replace( 'e', '', $mod ); //Get rid of eval modifier.
$ret .= $mod;
}
} else {
$pat = preg_replace_callback(
'/([^\\\\])?\(\?(.*\:)?(.*)\)/U',
function ( $_callbackMatches ) {
return "{$_callbackMatches[1]}(" . self::cleanupInternal( $_callbackMatches[2] ) . "{$_callbackMatches[3]})";
},
$pattern
);
$pat = preg_replace( '!([^\\\\])/!', '$1\\/', $pat );
$ret = '/' . $pat . '/';
}
return $ret;
}
// cleans up internal options, making sure they are valid
private static function cleanupInternal( $str ) {
global $wgRegexFunctionsAllowOptions;
$ret = '';
if ( !$wgRegexFunctionsAllowOptions ) {
return '';
}
foreach ( self::$options as $opt ) {
if( strpos( $str, $opt ) !== false ) {
$ret .= $opt;
}
}
return $ret;
}
}
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