wikimedia/mediawiki-extensions-AbuseFilter
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mediawiki-extensions-AbuseF.../AbuseFilter.parser.php

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<?php
if ( ! defined( 'MEDIAWIKI' ) )
die();
/**
Abuse filter parser.
Copyright (C) Victor Vasiliev, 2008. Based on ideas by Andrew Garrett Distributed under GNU GPL v2 terms.
Types of token:
* T_NONE - special-purpose token
* T_BRACE - ( or )
* T_COMMA - ,
* T_OP - operator like + or ^
* T_NUMBER - number
* T_STRING - string, in "" or ''
* T_KEYWORD - keyword
* T_ID - identifier
Levels of parsing:
* Conditionls (IF) - if-then-else-end, cond ? a :b
* BoolOps (BO) - &, |, ^
* CompOps (CO) - ==, !=, ===, !==, >, <, >=, <=
* SumRel (SR) - +, -
* MulRel (MR) - *, /, %
* Pow (P) - **
* BoolNeg (BN) - ! operation
* SpecialOperators (SO) - in and like
* Unarys (U) - plus and minus in cases like -5 or -(2 * +2)
* Braces (B) - ( and )
* Functions (F)
* Atom (A) - return value
*/
class AFPToken {
//Types of tken
const TNone = 'T_NONE';
const TID = 'T_ID';
const TKeyword = 'T_KEYWORD';
const TString = 'T_STRING';
const TInt = 'T_INT';
const TFloat = 'T_FLOAT';
const TOp = 'T_OP';
const TBrace = 'T_BRACE';
const TComma = 'T_COMMA';
var $type;
var $value;
var $pos;
public function __construct( $type = self::TNone, $value = null, $pos = 0 ) {
$this->type = $type;
$this->value = $value;
$this->pos = $pos;
}
}
class AFPData {
//Datatypes
const DInt = 'int';
const DString = 'string';
const DNull = 'null';
const DBool = 'bool';
const DFloat = 'float';
var $type;
var $data;
public function __construct( $type = self::DNull, $val = null ) {
$this->type = $type;
$this->data = $val;
}
public static function newFromPHPVar( $var ) {
if( is_string( $var ) )
return new AFPData( self::DString, $var );
elseif( is_int( $var ) )
return new AFPData( self::DInt, $var );
elseif( is_float( $var ) )
return new AFPData( self::DFloat, $var );
elseif( is_bool( $var ) )
return new AFPData( self::DBool, $var );
elseif( is_null( $var ) )
return new AFPData();
else
throw new AFPException( "Data type " . gettype( $var ) . " is not supported by AbuseFilter" );
}
public function dup() {
return new AFPData( $this->type, $this->data );
}
public static function castTypes( $orig, $target ) {
if( $orig->type == $target )
return $orig->dup();
if( $target == self::DNull ) {
return new AFPData();
}
if( $target == self::DBool ) {
return new AFPData( self::DBool, (bool)$orig->data );
}
if( $target == self::DFloat ) {
return new AFPData( self::DFloat, doubleval( $orig->data ) );
}
if( $target == self::DInt ) {
return new AFPData( self::DInt, intval( $orig->data ) );
}
if( $target == self::DString ) {
return new AFPData( self::DString, strval( $orig->data ) );
}
}
public static function boolInvert( $value ) {
return new AFPData( self::DBool, !$value->toBool() );
}
public static function pow( $base, $exponent ) {
return new AFPData( self::DFloat, pow( $base->toFloat(), $exponent->toFloat() ) );
}
public static function keywordIn( $a, $b ) {
$a = $a->toString();
$b = $b->toString();
if ($a == '' || $b == '') {
return new AFPData( self::DBool, false );
}
return new AFPData( self::DBool, in_string( $a, $b ) );
}
public static function keywordContains( $a, $b ) {
$a = $a->toString();
$b = $b->toString();
if ($a == '' || $b == '') {
return new AFPData( self::DBool, false );
}
return new AFPData( self::DBool, in_string( $b, $a ) );
}
public static function keywordLike( $str, $pattern ) {
$str = $str->toString();
$pattern = $pattern->toString();
wfSuppressWarnings();
$result = fnmatch( $pattern, $str );
wfRestoreWarnings();
return new AFPData( self::DBool, (bool)$result );
}
public static function keywordRegex( $str, $regex ) {
$str = $str->toString();
$pattern = $regex->toString();
if (preg_match('/^\/.*\/$/u', $pattern)) {
$pattern .= 'u';
} elseif (preg_match( '/^\/.*\/\w+$/u', $pattern ) ) {
# Nothing
} else {
$pattern = "/$pattern/u";
}
wfSuppressWarnings();
$result = preg_match( $pattern, $str );
wfRestoreWarnings();
return new AFPData( self::DBool, (bool)$result );
}
public static function unaryMinus( $data ) {
if ($data->type == self::DInt) {
return new AFPData( $data->type, -$data->toInt() );
} else {
return new AFPData( $data->type, -$data->toFloat() );
}
}
public static function boolOp( $a, $b, $op ) {
$a = $a->toBool();
$b = $b->toBool();
if( $op == '|' )
return new AFPData( self::DBool, $a || $b );
if( $op == '&' )
return new AFPData( self::DBool, $a && $b );
if( $op == '^' )
return new AFPData( self::DBool, $a xor $b );
throw new AFPException( "Invalid boolean operation: {$op}" ); // Should never happen.
}
public static function compareOp( $a, $b, $op ) {
if( $op == '==' || $op == '=' )
return new AFPData( self::DBool, $a->toString() === $b->toString() );
if( $op == '!=' )
return new AFPData( self::DBool, $a->toString() !== $b->toString() );
if( $op == '===' )
return new AFPData( self::DBool, $a->data == $b->data && $a->type == $b->type );
if( $op == '!==' )
return new AFPData( self::DBool, $a->data !== $b->data || $a->type != $b->type );
$a = $a->toString();
$b = $b->toString();
if( $op == '>' )
return new AFPData( self::DBool, $a > $b );
if( $op == '<' )
return new AFPData( self::DBool, $a < $b );
if( $op == '>=' )
return new AFPData( self::DBool, $a >= $b );
if( $op == '<=' )
return new AFPData( self::DBool, $a <= $b );
throw new AFPException( "Invalid comparison operation: {$op}" ); // Should never happen
}
public static function mulRel( $a, $b, $op ) {
// Figure out the type.
if ($a->type == self::DFloat || $b->type == self::DFloat ||
$a->toFloat() != $a->toString() || $b->toFloat() != $b->toString() ) {
$type = self::DFloat;
$a = $a->toFloat();
$b = $b->toFloat();
} else {
$type = self::DInt;
$a = $a->toInt();
$b = $b->toInt();
}
if ($op != '*' && $b == 0) {
throw new AFPUserVisibleException( 'dividebyzero', 0, array($a) );
}
$data = null;
if( $op == '*' )
$data = $a * $b;
elseif( $op == '/' )
$data = $a / $b;
elseif( $op == '%' )
$data = $a % $b;
else
throw new AFPException( "Invalid multiplication-related operation: {$op}" ); // Should never happen
if ($type == self::DInt)
$data = intval($data);
else
$data = doubleval($data);
return new AFPData( $type, $data );
}
public static function sum( $a, $b ) {
if( $a->type == self::DString || $b->type == self::DString )
return new AFPData( self::DFloat, $a->toString() . $b->toString() );
else
return new AFPData( self::DFloat, $a->toFloat() + $b->toFloat() );
}
public static function sub( $a, $b ) {
return new AFPData( self::DFloat, $a->toFloat() - $b->toFloat() );
}
/** Convert shorteners */
public function toBool() {
return self::castTypes( $this, self::DBool )->data;
}
public function toString() {
return self::castTypes( $this, self::DString )->data;
}
public function toFloat() {
return self::castTypes( $this, self::DFloat )->data;
}
public function toInt() {
return self::castTypes( $this, self::DInt )->data;
}
}
class AFPException extends MWException {}
// Exceptions that we might conceivably want to report to ordinary users
// (i.e. exceptions that don't represent bugs in the extension itself)
class AFPUserVisibleException extends AFPException {
function __construct( $exception_id, $position, $params) {
$msg = wfMsgExt( 'abusefilter-exception-'.$exception_id, array(), array_merge( array($position), $params ) );
parent::__construct( $msg );
$this->mExceptionID = $exception_id;
$this->mPosition = $position;
$this->mParams = $params;
}
}
class AbuseFilterParser {
var $mParams, $mVars, $mCode, $mTokens, $mPos, $mCur;
// length,lcase,ccnorm,rmdoubles,specialratio,rmspecials,norm,count
static $mFunctions = array(
'lcase' => 'funcLc',
'length' => 'funcLen',
'string' => 'castString',
'int' => 'castInt',
'float' => 'castFloat',
'bool' => 'castBool',
'norm' => 'funcNorm',
'ccnorm' => 'funcCCNorm',
'specialratio' => 'funcSpecialRatio',
'rmspecials' => 'funcRMSpecials',
'rmdoubles' => 'funcRMDoubles',
'count' => 'funcCount'
);
static $mOps = array(
'!', '*', '**', '/', '+', '-', '%', '&', '|', '^', '?',
'<', '>', '>=', '<=', '==', '!=', '=', '===', '!==', ':',
);
static $mKeywords = array(
'in', 'like', 'true', 'false', 'null', 'contains', 'matches',
'rlike', 'regex', 'if', 'then', 'else', 'end',
);
static $parserCache = array();
static $funcCache = array();
public function __construct() {
$this->resetState();
}
public function resetState() {
$this->mParams = array();
$this->mCode = '';
$this->mTokens = array();
$this->mVars = array();
$this->mPos = 0;
}
public function checkSyntax( $filter ) {
try {
$this->parse($filter);
} catch (AFPUserVisibleException $excep) {
return array($excep->getMessage(), $excep->mPosition);
}
return true;
}
public function setVar( $name, $var ) {
$this->mVars[$name] = AFPData::newFromPHPVar( $var );
}
public function setVars( $vars ) {
wfProfileIn( __METHOD__ );
foreach( $vars as $name => $var ) {
$this->setVar( $name, $var );
}
wfProfileOut( __METHOD__ );
}
protected function move( $shift = +1 ) {
$old = $this->mPos;
$this->mPos += $shift;
if( $this->mPos >= 0 && $this->mPos < count( $this->mTokens ) ) {
$this->mCur = $this->mTokens[$this->mPos];
return true;
}
else {
$this->mPos = $old;
return false;
}
}
public function parse( $code ) {
return $this->intEval( $code )->toBool();
}
public function evaluateExpression( $filter ) {
return $this->intEval( $filter )->toString();
}
function intEval( $code ) {
wfProfileIn( __METHOD__ );
$this->mCode = $code;
$this->mTokens = self::parseTokens( $code );
$this->mPos = 0;
$this->mCur = $this->mTokens[0];
$result = new AFPData();
$this->doLevelEntry( $result );
wfProfileOut( __METHOD__ );
return $result;
}
/* Levels */
/** Handles unexpected characters after the expression */
protected function doLevelEntry( &$result ) {
$this->doLevelSet( $result );
if( $this->mCur->type != AFPToken::TNone ) {
throw new AFPUserVisibleException( 'unexpectedatend', $this->mCur->pos, array($this->mCur->type) );
}
}
/** Handles "=" operator */
protected function doLevelSet( &$result ) {
$this->doLevelConditions( $result );
}
protected function doLevelConditions( &$result ) {
if( $this->mCur->type == AFPToken::TKeyword && $this->mCur->value == 'if' ) {
$this->move();
$this->doLevelBoolOps( $result );
if( !($this->mCur->type == AFPToken::TKeyword && $this->mCur->value == 'then') )
throw new AFPUserVisibleException( 'expectednotfound', $this->mCur->pos, array('then') );
$this->move();
$r1 = new AFPData();
$r2 = new AFPData();
$this->doLevelConditions( $r1 );
if( !($this->mCur->type == AFPToken::TKeyword && $this->mCur->value == 'else') )
throw new AFPUserVisibleException( 'expectednotfound', $this->mCur->pos, array('else') );
$this->move();
$this->doLevelConditions( $r2 );
if( $result->toBool() ) {
$result = $r1;
} else {
$result = $r2;
}
if( !($this->mCur->type == AFPToken::TKeyword && $this->mCur->value == 'end') )
throw new AFPUserVisibleException( 'expectednotfound', $this->mCur->pos, array('end') );
$this->move();
} else {
$this->doLevelBoolOps( $result );
if( $this->mCur->type == AFPToken::TOp && $this->mCur->value == '?' ) {
$this->move();
$r1 = new AFPData();
$r2 = new AFPData();
$this->doLevelConditions( $r1 );
if( !($this->mCur->type == AFPToken::TOp && $this->mCur->value == ':') )
throw new AFPUserVisibleException( 'expectednotfound', $this->mCur->pos, array(':') );
$this->move();
$this->doLevelConditions( $r2 );
if( $result->toBool() ) {
$result = $r1;
} else {
$result = $r2;
}
}
}
}
protected function doLevelBoolOps( &$result ) {
$this->doLevelCompares( $result );
$ops = array( '&', '|', '^' );
while( $this->mCur->type == AFPToken::TOp && in_array( $this->mCur->value, $ops ) ) {
$op = $this->mCur->value;
$this->move();
$r2 = new AFPData();
$this->doLevelCompares( $r2 );
wfProfileIn( __METHOD__ );
$result = AFPData::boolOp( $result, $r2, $op );
wfProfileOut( __METHOD__ );
}
}
protected function doLevelCompares( &$result ) {
AbuseFilter::triggerLimiter();
$this->doLevelSumRels( $result );
$ops = array( '==', '===', '!=', '!==', '<', '>', '<=', '>=', '=' );
while( $this->mCur->type == AFPToken::TOp && in_array( $this->mCur->value, $ops ) ) {
$op = $this->mCur->value;
$this->move();
$r2 = new AFPData();
$this->doLevelSumRels( $r2 );
wfProfileIn( __METHOD__ );
$result = AFPData::compareOp( $result, $r2, $op );
wfProfileOut( __METHOD__ );
}
}
protected function doLevelSumRels( &$result ) {
$this->doLevelMulRels( $result );
wfProfileIn( __METHOD__ );
$ops = array( '+', '-' );
while( $this->mCur->type == AFPToken::TOp && in_array( $this->mCur->value, $ops ) ) {
$op = $this->mCur->value;
$this->move();
$r2 = new AFPData();
$this->doLevelMulRels( $r2 );
if( $op == '+' )
$result = AFPData::sum( $result, $r2 );
if( $op == '-' )
$result = AFPData::sub( $result, $r2 );
}
wfProfileOut( __METHOD__ );
}
protected function doLevelMulRels( &$result ) {
$this->doLevelPow( $result );
wfProfileIn( __METHOD__ );
$ops = array( '*', '/', '%' );
while( $this->mCur->type == AFPToken::TOp && in_array( $this->mCur->value, $ops ) ) {
$op = $this->mCur->value;
$this->move();
$r2 = new AFPData();
$this->doLevelPow( $r2 );
$result = AFPData::mulRel( $result, $r2, $op );
}
wfProfileOut( __METHOD__ );
}
protected function doLevelPow( &$result ) {
$this->doLevelBoolInvert( $result );
wfProfileIn( __METHOD__ );
while( $this->mCur->type == AFPToken::TOp && $this->mCur->value == '**' ) {
$this->move();
$expanent = new AFPData();
$this->doLevelBoolInvert( $expanent );
$result = AFPData::pow( $result, $expanent );
}
wfProfileOut( __METHOD__ );
}
protected function doLevelBoolInvert( &$result ) {
if( $this->mCur->type == AFPToken::TOp && $this->mCur->value == '!' ) {
$this->move();
$this->doLevelSpecialWords( $result );
wfProfileIn( __METHOD__ );
$result = AFPData::boolInvert( $result );
wfProfileOut( __METHOD__ );
} else {
$this->doLevelSpecialWords( $result );
}
}
protected function doLevelSpecialWords( &$result ) {
$this->doLevelUnarys( $result );
$specwords = array( 'in' => 'keywordIn', 'like' => 'keywordLike', 'matches' => 'keywordLike', 'contains' => 'keywordContains', 'rlike' => 'keywordRegex', 'regex' => 'keywordRegex' );
if( $this->mCur->type == AFPToken::TKeyword && in_array( $this->mCur->value, array_keys($specwords) ) ) {
$func = $specwords[$this->mCur->value];
$this->move();
$r2 = new AFPData();
$this->doLevelUnarys( $r2 );
wfProfileIn( __METHOD__ );
wfProfileIn( __METHOD__."-$func" );
$result = AFPData::$func( $result, $r2 );
wfProfileOut( __METHOD__."-$func" );
wfProfileOut( __METHOD__ );
}
}
protected function doLevelUnarys( &$result ) {
$op = $this->mCur->value;
if( $this->mCur->type == AFPToken::TOp && ( $op == "+" || $op == "-" ) ) {
$this->move();
$this->doLevelBraces( $result );
wfProfileIn( __METHOD__ );
if( $op == '-' ) {
$result = AFPData::unaryMinus( $result );
}
wfProfileOut( __METHOD__ );
} else {
$this->doLevelBraces( $result );
}
}
protected function doLevelBraces( &$result ) {
if( $this->mCur->type == AFPToken::TBrace && $this->mCur->value == '(' ) {
$this->move();
$this->doLevelSet( $result );
if( !($this->mCur->type == AFPToken::TBrace && $this->mCur->value == ')') )
throw new AFPUserVisibleException( 'expectednotfound', $this->mCur->pos, array(')') );
$this->move();
} else {
$this->doLevelFunction( $result );
}
}
protected function doLevelFunction( &$result ) {
if( $this->mCur->type == AFPToken::TID && isset( self::$mFunctions[$this->mCur->value] ) ) {
wfProfileIn( __METHOD__ );
$func = self::$mFunctions[$this->mCur->value];
$this->move();
if( $this->mCur->type != AFPToken::TBrace || $this->mCur->value != '(' )
throw new AFPUserVisibleException( 'expectednotfound', $this->mCur->pos, array('(') );
wfProfileIn( __METHOD__."-loadargs" );
$args = array();
do {
$this->move();
$r = new AFPData();
$this->doLevelSet( $r );
$args[] = $r;
} while( $this->mCur->type == AFPToken::TComma );
if( $this->mCur->type != AFPToken::TBrace || $this->mCur->value != ')' ) {
throw new AFPUserVisibleException( 'expectednotfound', $this->mCur->pos, array(')') );
}
wfProfileOut( __METHOD__."-loadargs" );
wfProfileIn( __METHOD__."-$func" );
$funcHash = md5($func.serialize($args));
if (isset(self::$funcCache[$funcHash])) {
$result = self::$funcCache[$funcHash];
} else {
AbuseFilter::triggerLimiter();
$result = self::$funcCache[$funcHash] = $this->$func( $args );
}
if (count(self::$funcCache) > 1000) {
self::$funcCache = array();
}
wfProfileOut( __METHOD__."-$func" );
$this->move();
wfProfileOut( __METHOD__ );
} else {
$this->doLevelAtom( $result );
}
}
protected function doLevelAtom( &$result ) {
wfProfileIn( __METHOD__ );
$tok = $this->mCur->value;
switch( $this->mCur->type ) {
case AFPToken::TID:
if( isset( $this->mVars[$tok] ) ) {
$result = $this->mVars[$tok];
} else {
$result = new AFPData();
}
break;
case AFPToken::TString:
$result = new AFPData( AFPData::DString, $tok );
break;
case AFPToken::TFloat:
$result = new AFPData( AFPData::DFloat, $tok );
break;
case AFPToken::TInt:
$result = new AFPData( AFPData::DInt, $tok );
break;
case AFPToken::TKeyword:
if( $tok == "true" )
$result = new AFPData( AFPData::DBool, true );
elseif( $tok == "false" )
$result = new AFPData( AFPData::DBool, false );
elseif( $tok == "null" )
$result = new AFPData();
else
throw new AFPUserVisibleException( 'unrecognisedkeyword', $this->mCur->pos, array($tok) );
break;
case AFPToken::TBrace:
if( $this->mCur->value == ')' )
return; // Handled at the entry level
default:
throw new AFPUserVisibleException( 'unexpectedtoken', $this->mCur->pos, array($this->mCur->value) );
}
$this->move();
wfProfileOut( __METHOD__ );
}
/* End of levels */
public static function parseTokens( $code ) {
$r = array();
$len = strlen( $code );
$hash = md5(trim($code));
if (isset(self::$parserCache[$hash])) {
return self::$parserCache[$hash];
}
while( $tok = self::nextToken( $code, $len ) ) {
list( $val, $type, $code, $pos ) = $tok;
$r[] = new AFPToken( $type, $val, $pos );
if( $type == AFPToken::TNone )
break;
}
return self::$parserCache[$hash] = $r;
}
protected static function nextToken( $code, $len ) {
$tok = '';
if( strlen( $code ) == 0 ) return array( '', AFPToken::TNone, $code, $len );
while( ctype_space( $code[0] ) )
$code = substr( $code, 1 );
$pos = $len - strlen( $code );
if( strlen( $code ) == 0 ) return array( '', AFPToken::TNone, $code, $pos );
if ( substr($code,0,2) == '/*' ) {
// Comments
$last = '/*';
while ($last != '*/') {
$code = substr($code,1);
$last[0] = $last[1];
$last[1] = $code[0];
}
$code = substr( $code, 1 );
return self::nextToken( $code, $len );
}
if( $code[0] == ',' )
return array( ',', AFPToken::TComma, substr( $code, 1 ), $pos );
if( $code[0] == '(' or $code[0] == ')' )
return array( $code[0], AFPToken::TBrace, substr( $code, 1 ), $pos );
if( $code[0] == '"' || $code[0] == "'" ) {
$type = $code[0];
$code = substr( $code, 1 );
while( strlen( $code ) != 0 ) {
if( $code[0] == $type ) {
return array( $tok, AFPToken::TString, substr( $code, 1 ), $pos );
}
if( $code[0] == '\\' ) {
if( $code[1] == '\\' )
$tok .= '\\';
elseif( $code[1] == $type )
$tok .= $type;
elseif( $code[1] == 'n' )
$tok .= "\n";
elseif( $code[1] == 'r' )
$tok .= "\r";
elseif( $code[1] == 't' )
$tok .= "\t";
elseif( $code[1] == 'x' ) {
$chr = substr($code,2,2);
$chr = wfBaseConvert( $chr, 16, 10 );
$tok .= chr($chr);
$code = substr( $code, 2 );
}
else
$tok .= $code[1];
$code = substr( $code, 2 );
} else {
$tok .= $code[0];
$code = substr( $code, 1 );
}
}
throw new AFPUserVisibleException( 'unclosedstring', $pos, array() );;
}
$bases = array( 'b' => 2, 'x' => 16, 'o' => 8 );
$baseClass = '['.implode('', array_keys($bases)).']';
$radixRegex = "/^[0-9A-Fa-f]+$baseClass\b/u";
if( ctype_digit($code[0]) || ( self::isDigitOrDot( $code[0] ) && !empty($code[1]) && ctype_digit( $code[1] ) ) || preg_match( $radixRegex, $code ) ) {
$tok .= $code[0];
$code = substr( $code, 1 );
$base = '';
while( strlen( $code ) != 0 && self::isDigitOrDot( $code[0] ) ) {
$tok .= $base = $code[0];
$code = substr( $code, 1 );
}
if ($base && isset($bases[$base]) ) {
$tok = substr( $tok, 0, -1 );
$base = $bases[$base];
$code = substr( $code, 1 );
$tok = wfBaseConvert( $tok, $base, 10 );
}
$float = in_string( '.', $tok );
if (strlen($tok))
return array( $float ? doubleval( $tok ) : intval( $tok ), $float ? AFPToken::TFloat : AFPToken::TInt, $code, $pos );
}
if( ctype_punct( $code[0] ) ) {
$tok .= $code[0];
$code = substr( $code, 1 );
while( strlen( $code ) != 0 && ctype_punct( $code[0] ) ) {
$tok .= $code[0];
$code = substr( $code, 1 );
}
if( !in_array( $tok, self::$mOps ) )
throw new AFPUserVisibleException( 'invalidoperator', $pos, array($tok) );
return array( $tok, AFPToken::TOp, $code, $pos );
}
if( self::isValidIdSymbol( $code[0] ) ) {
while( strlen( $code ) != 0 && self::isValidIdSymbol( $code[0] ) ) {
$tok .= $code[0];
$code = substr( $code, 1 );
}
$type = in_array( $tok, self::$mKeywords ) ? AFPToken::TKeyword : AFPToken::TID;
return array( $tok, $type, $code, $pos );
}
throw new AFPUserVisibleException( 'unrecognisedtoken', $pos, array($code[0]) );;
}
protected static function isDigitOrDot( $chr ) {
return ctype_alnum( $chr ) || $chr == '.';
}
protected static function isValidIdSymbol( $chr ) {
return ctype_alnum( $chr ) || $chr == '_';
}
//Built-in functions
protected function funcLc( $args ) {
global $wgContLang;
if( count( $args ) < 1 )
throw new AFPExpection( "No params passed to lc()" );
$s = $args[0]->toString();
return new AFPData( AFPData::DString, $wgContLang->lc( $s ) );
}
protected function funcLen( $args ) {
if( count( $args ) < 1 )
throw new AFPExpection( "No params passed to len()" );
$s = $args[0]->toString();
return new AFPData( AFPData::DInt, mb_strlen( $s, 'utf-8' ) );
}
protected function funcSimpleNorm( $args ) {
if( count( $args ) < 1 )
throw new AFPExpection( "No params passed to simplenorm()" );
$s = $args[0]->toString();
$s = preg_replace( '/[\d\W]+/', '', $s );
$s = strtolower( $value );
return new AFPData( AFPData::DString, $s );
}
protected function funcSpecialRatio( $args ) {
if( count( $args ) < 1 )
throw new AFPExpection( "No params passed to specialratio()" );
$s = $args[0]->toString();
if (!strlen($s)) {
return new AFPData( AFPData::DFloat, 0 );
}
$nospecials = $this->rmspecials( $s );
$val = 1. - ((mb_strlen($nospecials) / mb_strlen($s)));
return new AFPData( AFPData::DFloat, $val );
}
protected function funcCount( $args ) {
if( count( $args ) < 1 )
throw new AFPExpection( "No params passed to ".__METHOD__ );
$offset = -1;
if (count($args) == 1) {
$count = count( explode( ",", $args[0]->toString() ) );
} else {
$needle = $args[0]->toString();
$haystack = $args[1]->toString();
$count = 0;
while ( ($offset = strpos( $haystack, $needle, $offset + 1 )) !== false ) {
$count++;
}
}
return new AFPData( AFPData::DInt, $count );
}
protected function funcCCNorm( $args ) {
if( count( $args ) < 1 )
throw new AFPExpection( "No params passed to ".__METHOD__ );
$s = $args[0]->toString();
$s = $this->ccnorm( $s );
return new AFPData( AFPData::DString, $s );
}
protected function ccnorm( $s ) {
if (!class_exists( 'AntiSpoof' ) ) {
return $s;
}
// Normalise confusable characters.
$chars = AntiSpoof::stringToList( $s );
$chars = AntiSpoof::equivString( $chars );
$s = AntiSpoof::listToString( $chars );
return $s;
}
protected function rmspecials( $s ) {
$orig = $s;
$s = preg_replace( '/[^\p{L}\p{N}]/u', '', $s );
return $s;
}
protected function rmdoubles( $s ) {
$last = -1;
$ret = array();
$chars = AntiSpoof::stringToList( $s );
foreach( $chars as $char) {
if ($char != $last)
$ret[] = $char;
$last = $char;
}
return AntiSpoof::listToString($ret);
}
protected function funcRMSpecials( $args ) {
if( count( $args ) < 1 )
throw new AFPExpection( "No params passed to ".__METHOD__ );
$s = $args[0]->toString();
$s = $this->rmspecials( $s );
return new AFPData( AFPData::DString, $s );
}
protected function funcRMDoubles( $args ) {
if( count( $args ) < 1 )
throw new AFPExpection( "No params passed to ".__METHOD__ );
$s = $args[0]->toString();
$s = $this->rmdoubles( $s );
return new AFPData( AFPData::DString, $s );
}
protected function funcNorm( $args ) {
if( count( $args ) < 1 )
throw new AFPExpection( "No params passed to ".__METHOD__ );
$s = $args[0]->toString();
$s = $this->ccnorm($s);
$s = $this->rmdoubles( $s );
$s = $this->rmspecials( $s );
return new AFPData( AFPData::DString, $s );
}
protected function castString( $args ) {
if ( count( $args ) < 1)
throw new AFPUserVisibleException( 'noparams', $this->mCur->pos, array(__METHOD__) );
$val = $args[0];
return new AFPData( AFPData::DString, $val->data );
}
protected function castInt( $args ) {
if ( count( $args ) < 1)
throw new AFPUserVisibleException( 'noparams', $this->mCur->pos, array(__METHOD__) );
$val = $args[0];
return new AFPData( AFPData::DInt, intval($val->data) );
}
protected function castFloat( $args ) {
if ( count( $args ) < 1)
throw new AFPUserVisibleException( 'noparams', $this->mCur->pos, array(__METHOD__) );
$val = $args[0];
return new AFPData( AFPData::DFloat, doubleval($val->data) );
}
protected function castBool( $args ) {
if ( count( $args ) < 1)
throw new AFPUserVisibleException( 'noparams', $this->mCur->pos, array(__METHOD__) );
$val = $args[0];
return new AFPData( AFPData::DBool, (bool)($val->data) );
}
}
## Taken from http://au2.php.net/manual/en/function.fnmatch.php#71725
### Attribution: jk at ricochetsolutions dot com
if(!function_exists('fnmatch')) {
function fnmatch($pattern, $string) {
return preg_match("#^".strtr(preg_quote($pattern, '#'), array('\*' => '.*', '\?' => '.'))."$#i", $string);
} // end
} // end if
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