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mediawiki-extensions-AbuseF.../AbuseFilter.parser.php
Victor Vasiliev aa399da279 Implement a tree-caching abuse filter parser 
This filter is fully functional.  The old filter is still enabled by
default for a transitional period in case the new one suddenly has
issues.

Change-Id: I4aea5f00c62420108030e60e79d5bf34e913e95d
2016-09-24 02:53:26 +00:00

2012 lines
47 KiB
PHP
Raw Blame History

<?php
/**
* Abuse filter parser.
* Copyright © 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
* * T_STATEMENT_SEPARATOR - ;
* * T_SQUARE_BRACKETS - [ or ]
*
* Levels of parsing:
* * Entry - catches unexpected characters
* * Semicolon - ;
* * Set - :=
* * 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)
* * ListElement (LE) - list[number]
* * 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 TSQUAREBRACKET = 'T_SQUARE_BRACKET';
const TCOMMA = 'T_COMMA';
const TSTATEMENTSEPARATOR = 'T_STATEMENT_SEPARATOR';
public $type;
public $value;
public $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';
const DLIST = 'list';
// Translation table mapping shell-style wildcards to PCRE equivalents.
// Derived from <http://www.php.net/manual/en/function.fnmatch.php#100207>
private static $wildcardMap = array(
'\*' => '.*',
'\+' => '\+',
'\-' => '\-',
'\.' => '\.',
'\?' => '.',
'\[' => '[',
'\[\!' => '[^',
'\\' => '\\\\',
'\]' => ']',
);
public $type;
public $data;
/**
* @param string $type
* @param null $val
*/
public function __construct( $type = self::DNULL, $val = null ) {
$this->type = $type;
$this->data = $val;
}
/**
* @param $var
* @return AFPData
* @throws AFPException
*/
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_array( $var ) ) {
$result = array();
foreach ( $var as $item ) {
$result[] = self::newFromPHPVar( $item );
}
return new AFPData( self::DLIST, $result );
} elseif ( is_null( $var ) ) {
return new AFPData();
} else {
throw new AFPException(
'Data type ' . gettype( $var ) . ' is not supported by AbuseFilter'
);
}
}
/**
* @return AFPData
*/
public function dup() {
return new AFPData( $this->type, $this->data );
}
/**
* @param $orig AFPData
* @param $target
* @return AFPData
*/
public static function castTypes( $orig, $target ) {
if ( $orig->type == $target ) {
return $orig->dup();
}
if ( $target == self::DNULL ) {
return new AFPData();
}
if ( $orig->type == self::DLIST ) {
if ( $target == self::DBOOL ) {
return new AFPData( self::DBOOL, (bool)count( $orig->data ) );
}
if ( $target == self::DFLOAT ) {
return new AFPData( self::DFLOAT, floatval( count( $orig->data ) ) );
}
if ( $target == self::DINT ) {
return new AFPData( self::DINT, intval( count( $orig->data ) ) );
}
if ( $target == self::DSTRING ) {
$s = '';
foreach ( $orig->data as $item ) {
$s .= $item->toString() . "\n";
}
return new AFPData( self::DSTRING, $s );
}
}
if ( $target == self::DBOOL ) {
return new AFPData( self::DBOOL, (bool)$orig->data );
}
if ( $target == self::DFLOAT ) {
return new AFPData( self::DFLOAT, floatval( $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 ) );
}
if ( $target == self::DLIST ) {
return new AFPData( self::DLIST, array( $orig ) );
}
}
/**
* @param $value AFPData
* @return AFPData
*/
public static function boolInvert( $value ) {
return new AFPData( self::DBOOL, !$value->toBool() );
}
/**
* @param $base AFPData
* @param $exponent AFPData
* @return AFPData
*/
public static function pow( $base, $exponent ) {
return new AFPData( self::DFLOAT, pow( $base->toFloat(), $exponent->toFloat() ) );
}
/**
* @param $a AFPData
* @param $b AFPData
* @return AFPData
*/
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, strpos( $b, $a ) !== false );
}
/**
* @param $a AFPData
* @param $b AFPData
* @return AFPData
*/
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, strpos( $a, $b ) !== false );
}
/**
* @param $value
* @param $list
* @return bool
*/
public static function listContains( $value, $list ) {
// Should use built-in PHP function somehow
foreach ( $list->data as $item ) {
if ( self::equals( $value, $item ) ) {
return true;
}
}
return false;
}
/**
* @param $d1 AFPData
* @param $d2 AFPData
* @return bool
*/
public static function equals( $d1, $d2 ) {
return $d1->type != self::DLIST && $d2->type != self::DLIST &&
$d1->toString() === $d2->toString();
}
/**
* @param $str AFPData
* @param $pattern AFPData
* @return AFPData
*/
public static function keywordLike( $str, $pattern ) {
$str = $str->toString();
$pattern = '#^' . strtr( preg_quote( $pattern->toString(), '#' ), self::$wildcardMap ) . '$#u';
wfSuppressWarnings();
$result = preg_match( $pattern, $str );
wfRestoreWarnings();
return new AFPData( self::DBOOL, (bool)$result );
}
/**
* @param $str AFPData
* @param $regex AFPData
* @param $pos
* @param $insensitive bool
* @return AFPData
* @throws Exception
*/
public static function keywordRegex( $str, $regex, $pos, $insensitive = false ) {
$str = $str->toString();
$pattern = $regex->toString();
$pattern = preg_replace( '!(\\\\\\\\)*(\\\\)?/!', '$1\/', $pattern );
$pattern = "/$pattern/u";
if ( $insensitive ) {
$pattern .= 'i';
}
$result = preg_match( $pattern, $str );
if ( $result === false ) {
throw new AFPUserVisibleException(
'regexfailure',
$pos,
array( 'unspecified error in preg_match()', $pattern )
);
}
return new AFPData( self::DBOOL, (bool)$result );
}
/**
* @param $str
* @param $regex
* @param $pos
* @return AFPData
*/
public static function keywordRegexInsensitive( $str, $regex, $pos ) {
return self::keywordRegex( $str, $regex, $pos, true );
}
/**
* @param $data AFPData
* @return AFPData
*/
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() );
}
}
/**
* @param $a AFPData
* @param $b AFPData
* @param $op string
* @return AFPData
* @throws AFPException
*/
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.
}
/**
* @param $a AFPData
* @param $b AFPData
* @param $op string
* @return AFPData
* @throws AFPException
*/
public static function compareOp( $a, $b, $op ) {
if ( $op == '==' || $op == '=' ) {
return new AFPData( self::DBOOL, self::equals( $a, $b ) );
}
if ( $op == '!=' ) {
return new AFPData( self::DBOOL, !self::equals( $a, $b ) );
}
if ( $op == '===' ) {
return new AFPData( self::DBOOL, $a->type == $b->type && self::equals( $a, $b ) );
}
if ( $op == '!==' ) {
return new AFPData( self::DBOOL, $a->type != $b->type || !self::equals( $a, $b ) );
}
$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
}
/**
* @param $a AFPData
* @param $b AFPData
* @param $op string
* @param $pos
* @return AFPData
* @throws AFPUserVisibleException
* @throws AFPException
*/
public static function mulRel( $a, $b, $op, $pos ) {
// 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', $pos, array( $a ) );
}
if ( $op == '*' ) {
$data = $a * $b;
} elseif ( $op == '/' ) {
$data = $a / $b;
} elseif ( $op == '%' ) {
$data = $a % $b;
} else {
// Should never happen
throw new AFPException( "Invalid multiplication-related operation: {$op}" );
}
if ( $type == self::DINT ) {
$data = intval( $data );
} else {
$data = floatval( $data );
}
return new AFPData( $type, $data );
}
/**
* @param $a AFPData
* @param $b AFPData
* @return AFPData
*/
public static function sum( $a, $b ) {
if ( $a->type == self::DSTRING || $b->type == self::DSTRING ) {
return new AFPData( self::DSTRING, $a->toString() . $b->toString() );
} elseif ( $a->type == self::DLIST && $b->type == self::DLIST ) {
return new AFPData( self::DLIST, array_merge( $a->toList(), $b->toList() ) );
} else {
return new AFPData( self::DFLOAT, $a->toFloat() + $b->toFloat() );
}
}
/**
* @param $a AFPData
* @param $b AFPData
* @return AFPData
*/
public static function sub( $a, $b ) {
return new AFPData( self::DFLOAT, $a->toFloat() - $b->toFloat() );
}
/** Convert shorteners */
/**
* @throws MWException
* @return mixed
*/
public function toNative() {
switch ( $this->type ) {
case self::DBOOL:
return $this->toBool();
case self::DSTRING:
return $this->toString();
case self::DFLOAT:
return $this->toFloat();
case self::DINT:
return $this->toInt();
case self::DLIST:
$input = $this->toList();
$output = array();
foreach ( $input as $item ) {
$output[] = $item->toNative();
}
return $output;
case self::DNULL:
return null;
default:
throw new MWException( "Unknown type" );
}
}
/**
* @return bool
*/
public function toBool() {
return self::castTypes( $this, self::DBOOL )->data;
}
/**
* @return string
*/
public function toString() {
return self::castTypes( $this, self::DSTRING )->data;
}
/**
* @return float
*/
public function toFloat() {
return self::castTypes( $this, self::DFLOAT )->data;
}
/**
* @return int
*/
public function toInt() {
return self::castTypes( $this, self::DINT )->data;
}
public function toList() {
return self::castTypes( $this, self::DLIST )->data;
}
}
class AFPParserState {
public $pos, $token;
public function __construct( $token, $pos ) {
$this->token = $token;
$this->pos = $pos;
}
}
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 {
public $mExceptionId;
public $mPosition;
public $mParams;
/**
* @param string $exception_id
* @param int $position
* @param array $params
*/
function __construct( $exception_id, $position, $params ) {
$this->mExceptionID = $exception_id;
$this->mPosition = $position;
$this->mParams = $params;
// Exception message text for logs should be in English.
$msg = $this->getMessageObj()->inLanguage( 'en' )->useDatabase( false )->text();
parent::__construct( $msg );
}
public function getMessageObj() {
// Give grep a chance to find the usages:
// abusefilter-exception-unexpectedatend, abusefilter-exception-expectednotfound
// abusefilter-exception-unrecognisedkeyword, abusefilter-exception-unexpectedtoken
// abusefilter-exception-unclosedstring, abusefilter-exception-invalidoperator
// abusefilter-exception-unrecognisedtoken, abusefilter-exception-noparams
// abusefilter-exception-dividebyzero, abusefilter-exception-unrecognisedvar
// abusefilter-exception-notenoughargs, abusefilter-exception-regexfailure
// abusefilter-exception-overridebuiltin, abusefilter-exception-outofbounds
// abusefilter-exception-notlist
return wfMessage(
'abusefilter-exception-' . $this->mExceptionID,
array_merge( array( $this->mPosition ), $this->mParams )
);
}
}
class AbuseFilterParser {
public $mCode, $mTokens, $mPos, $mCur, $mShortCircuit, $mAllowShort, $mLen;
/**
* @var AbuseFilterVariableHolder
*/
public $mVars;
// length,lcase,ucase,ccnorm,rmdoubles,specialratio,rmspecials,norm,count
public static $mFunctions = array(
'lcase' => 'funcLc',
'ucase' => 'funcUc',
'length' => 'funcLen',
'string' => 'castString',
'int' => 'castInt',
'float' => 'castFloat',
'bool' => 'castBool',
'norm' => 'funcNorm',
'ccnorm' => 'funcCCNorm',
'specialratio' => 'funcSpecialRatio',
'rmspecials' => 'funcRMSpecials',
'rmdoubles' => 'funcRMDoubles',
'rmwhitespace' => 'funcRMWhitespace',
'count' => 'funcCount',
'rcount' => 'funcRCount',
'ip_in_range' => 'funcIPInRange',
'contains_any' => 'funcContainsAny',
'substr' => 'funcSubstr',
'strlen' => 'funcLen',
'strpos' => 'funcStrPos',
'str_replace' => 'funcStrReplace',
'rescape' => 'funcStrRegexEscape',
'set' => 'funcSetVar',
'set_var' => 'funcSetVar',
);
// Functions that affect parser state, and shouldn't be cached.
public static $ActiveFunctions = array(
'funcSetVar',
);
public static $mKeywords = array(
'in' => 'keywordIn',
'like' => 'keywordLike',
'matches' => 'keywordLike',
'contains' => 'keywordContains',
'rlike' => 'keywordRegex',
'irlike' => 'keywordRegexInsensitive',
'regex' => 'keywordRegex'
);
public static $funcCache = array();
/**
* Create a new instance
*
* @param $vars AbuseFilterVariableHolder
*/
public function __construct( $vars = null ) {
$this->resetState();
if ( $vars instanceof AbuseFilterVariableHolder ) {
$this->mVars = $vars;
}
}
public function resetState() {
$this->mCode = '';
$this->mTokens = array();
$this->mVars = new AbuseFilterVariableHolder;
$this->mPos = 0;
$this->mShortCircuit = false;
$this->mAllowShort = true;
}
/**
* @param $filter
* @return array|bool
*/
public function checkSyntax( $filter ) {
try {
$origAS = $this->mAllowShort;
$this->mAllowShort = false;
$this->parse( $filter );
} catch ( AFPUserVisibleException $excep ) {
$this->mAllowShort = $origAS;
return array( $excep->getMessageObj()->text(), $excep->mPosition );
}
$this->mAllowShort = $origAS;
return true;
}
/**
* @param $name
* @param $value
*/
public function setVar( $name, $value ) {
$this->mVars->setVar( $name, $value );
}
/**
* @param $vars
*/
public function setVars( $vars ) {
if ( is_array( $vars ) ) {
foreach ( $vars as $name => $var ) {
$this->setVar( $name, $var );
}
} elseif ( $vars instanceof AbuseFilterVariableHolder ) {
$this->mVars->addHolders( $vars );
}
}
/**
* @return AFPToken
*/
protected function move() {
list( $this->mCur, $this->mPos ) = $this->mTokens[$this->mPos];
}
/**
* getState() function allows parser state to be rollbacked to several tokens back
* @return AFPParserState
*/
protected function getState() {
return new AFPParserState( $this->mCur, $this->mPos );
}
/**
* setState() function allows parser state to be rollbacked to several tokens back
* @param AFPParserState $state
*/
protected function setState( AFPParserState $state ) {
$this->mCur = $state->token;
$this->mPos = $state->pos;
}
/**
* @return mixed
* @throws AFPUserVisibleException
*/
protected function skipOverBraces() {
if ( !( $this->mCur->type == AFPToken::TBRACE && $this->mCur->value == '(' ) ||
!$this->mShortCircuit
) {
return;
}
$braces = 1;
while ( $this->mCur->type != AFPToken::TNONE && $braces > 0 ) {
$this->move();
if ( $this->mCur->type == AFPToken::TBRACE ) {
if ( $this->mCur->value == '(' ) {
$braces++;
} elseif ( $this->mCur->value == ')' ) {
$braces--;
}
}
}
if ( !( $this->mCur->type == AFPToken::TBRACE && $this->mCur->value == ')' ) ) {
throw new AFPUserVisibleException( 'expectednotfound', $this->mCur->pos, array( ')' ) );
}
}
/**
* @param $code
* @return bool
*/
public function parse( $code ) {
return $this->intEval( $code )->toBool();
}
/**
* @param $filter
* @return string
*/
public function evaluateExpression( $filter ) {
return $this->intEval( $filter )->toString();
}
/**
* @param $code
* @return AFPData
*/
function intEval( $code ) {
// Setup, resetting
$this->mCode = $code;
$this->mTokens = AbuseFilterTokenizer::tokenize( $code );
$this->mPos = 0;
$this->mLen = strlen( $code );
$this->mShortCircuit = false;
$result = new AFPData();
$this->doLevelEntry( $result );
return $result;
}
/**
* @param $a
* @param $b
* @return int
*/
static function lengthCompare( $a, $b ) {
if ( strlen( $a ) == strlen( $b ) ) {
return 0;
}
return ( strlen( $a ) < strlen( $b ) ) ? -1 : 1;
}
/* Levels */
/**
* Handles unexpected characters after the expression
*
* @param $result AFPData
* @throws AFPUserVisibleException
*/
protected function doLevelEntry( &$result ) {
$this->doLevelSemicolon( $result );
if ( $this->mCur->type != AFPToken::TNONE ) {
throw new AFPUserVisibleException(
'unexpectedatend',
$this->mCur->pos, array( $this->mCur->type )
);
}
}
/**
* Handles multiple expressions
* @param $result AFPData
*/
protected function doLevelSemicolon( &$result ) {
do {
$this->move();
if ( $this->mCur->type != AFPToken::TSTATEMENTSEPARATOR ) {
$this->doLevelSet( $result );
}
} while ( $this->mCur->type == AFPToken::TSTATEMENTSEPARATOR );
}
/**
* Handles multiple expressions
*
* @param $result AFPData
* @throws AFPUserVisibleException
*/
protected function doLevelSet( &$result ) {
if ( $this->mCur->type == AFPToken::TID ) {
$varname = $this->mCur->value;
$prev = $this->getState();
$this->move();
if ( $this->mCur->type == AFPToken::TOP && $this->mCur->value == ':=' ) {
$this->move();
$this->doLevelSet( $result );
$this->setUserVariable( $varname, $result );
return;
} elseif ( $this->mCur->type == AFPToken::TSQUAREBRACKET && $this->mCur->value == '[' ) {
if ( !$this->mVars->varIsSet( $varname ) ) {
throw new AFPUserVisibleException( 'unrecognisedvar',
$this->mCur->pos,
array( $varname )
);
}
$list = $this->mVars->getVar( $varname );
if ( $list->type != AFPData::DLIST ) {
throw new AFPUserVisibleException( 'notlist', $this->mCur->pos, array() );
}
$list = $list->toList();
$this->move();
if ( $this->mCur->type == AFPToken::TSQUAREBRACKET && $this->mCur->value == ']' ) {
$idx = 'new';
} else {
$this->setState( $prev );
$this->move();
$idx = new AFPData();
$this->doLevelSemicolon( $idx );
$idx = $idx->toInt();
if ( !( $this->mCur->type == AFPToken::TSQUAREBRACKET && $this->mCur->value == ']' ) ) {
throw new AFPUserVisibleException( 'expectednotfound', $this->mCur->pos,
array( ']', $this->mCur->type, $this->mCur->value ) );
}
if ( count( $list ) <= $idx ) {
throw new AFPUserVisibleException( 'outofbounds', $this->mCur->pos,
array( $idx, count( $result->data ) ) );
}
}
$this->move();
if ( $this->mCur->type == AFPToken::TOP && $this->mCur->value == ':=' ) {
$this->move();
$this->doLevelSet( $result );
if ( $idx === 'new' ) {
$list[] = $result;
} else {
$list[$idx] = $result;
}
$this->setUserVariable( $varname, new AFPData( AFPData::DLIST, $list ) );
return;
} else {
$this->setState( $prev );
}
} else {
$this->setState( $prev );
}
}
$this->doLevelConditions( $result );
}
/**
* @param $result AFPData
* @throws AFPUserVisibleException
*/
protected function doLevelConditions( &$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->mCur->type,
$this->mCur->value
)
);
}
$this->move();
$r1 = new AFPData();
$r2 = new AFPData();
$isTrue = $result->toBool();
if ( !$isTrue ) {
$scOrig = $this->mShortCircuit;
$this->mShortCircuit = $this->mAllowShort;
}
$this->doLevelConditions( $r1 );
if ( !$isTrue ) {
$this->mShortCircuit = $scOrig;
}
if ( !( $this->mCur->type == AFPToken::TKEYWORD && $this->mCur->value == 'else' ) ) {
throw new AFPUserVisibleException( 'expectednotfound',
$this->mCur->pos,
array(
'else',
$this->mCur->type,
$this->mCur->value
)
);
}
$this->move();
if ( $isTrue ) {
$scOrig = $this->mShortCircuit;
$this->mShortCircuit = $this->mAllowShort;
}
$this->doLevelConditions( $r2 );
if ( $isTrue ) {
$this->mShortCircuit = $scOrig;
}
if ( !( $this->mCur->type == AFPToken::TKEYWORD && $this->mCur->value == 'end' ) ) {
throw new AFPUserVisibleException( 'expectednotfound',
$this->mCur->pos,
array(
'end',
$this->mCur->type,
$this->mCur->value
)
);
}
$this->move();
if ( $result->toBool() ) {
$result = $r1;
} else {
$result = $r2;
}
} else {
$this->doLevelBoolOps( $result );
if ( $this->mCur->type == AFPToken::TOP && $this->mCur->value == '?' ) {
$this->move();
$r1 = new AFPData();
$r2 = new AFPData();
$isTrue = $result->toBool();
if ( !$isTrue ) {
$scOrig = $this->mShortCircuit;
$this->mShortCircuit = $this->mAllowShort;
}
$this->doLevelConditions( $r1 );
if ( !$isTrue ) {
$this->mShortCircuit = $scOrig;
}
if ( !( $this->mCur->type == AFPToken::TOP && $this->mCur->value == ':' ) ) {
throw new AFPUserVisibleException( 'expectednotfound',
$this->mCur->pos,
array(
':',
$this->mCur->type,
$this->mCur->value
)
);
}
$this->move();
if ( $isTrue ) {
$scOrig = $this->mShortCircuit;
$this->mShortCircuit = $this->mAllowShort;
}
$this->doLevelConditions( $r2 );
if ( $isTrue ) {
$this->mShortCircuit = $scOrig;
}
if ( $isTrue ) {
$result = $r1;
} else {
$result = $r2;
}
}
}
}
/**
* @param $result AFPData
*/
protected function doLevelBoolOps( &$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();
// We can go on quickly as either one statement with | is true or on with & is false
if ( ( $op == '&' && !$result->toBool() ) || ( $op == '|' && $result->toBool() ) ) {
wfProfileIn( __METHOD__ . '-shortcircuit' );
$orig = $this->mShortCircuit;
$this->mShortCircuit = $this->mAllowShort;
$this->doLevelCompares( $r2 );
$this->mShortCircuit = $orig;
$result = new AFPData( AFPData::DBOOL, $result->toBool() );
wfProfileOut( __METHOD__ . '-shortcircuit' );
continue;
}
$this->doLevelCompares( $r2 );
$result = AFPData::boolOp( $result, $r2, $op );
}
}
/**
* @param $result
*/
protected function doLevelCompares( &$result ) {
$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 );
if ( $this->mShortCircuit ) {
break; // The result doesn't matter.
}
AbuseFilter::triggerLimiter();
$result = AFPData::compareOp( $result, $r2, $op );
}
}
/**
* @param $result
*/
protected function doLevelSumRels( &$result ) {
$this->doLevelMulRels( $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->doLevelMulRels( $r2 );
if ( $this->mShortCircuit ) {
break; // The result doesn't matter.
}
if ( $op == '+' ) {
$result = AFPData::sum( $result, $r2 );
}
if ( $op == '-' ) {
$result = AFPData::sub( $result, $r2 );
}
}
}
/**
* @param $result
*/
protected function doLevelMulRels( &$result ) {
$this->doLevelPow( $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->doLevelPow( $r2 );
if ( $this->mShortCircuit ) {
break; // The result doesn't matter.
}
$result = AFPData::mulRel( $result, $r2, $op, $this->mCur->pos );
}
}
/**
* @param $result
*/
protected function doLevelPow( &$result ) {
$this->doLevelBoolInvert( $result );
while ( $this->mCur->type == AFPToken::TOP && $this->mCur->value == '**' ) {
$this->move();
$expanent = new AFPData();
$this->doLevelBoolInvert( $expanent );
if ( $this->mShortCircuit ) {
break; // The result doesn't matter.
}
$result = AFPData::pow( $result, $expanent );
}
}
/**
* @param $result
*/
protected function doLevelBoolInvert( &$result ) {
if ( $this->mCur->type == AFPToken::TOP && $this->mCur->value == '!' ) {
$this->move();
$this->doLevelSpecialWords( $result );
if ( $this->mShortCircuit ) {
return; // The result doesn't matter.
}
$result = AFPData::boolInvert( $result );
} else {
$this->doLevelSpecialWords( $result );
}
}
/**
* @param $result
*/
protected function doLevelSpecialWords( &$result ) {
$this->doLevelUnarys( $result );
$keyword = strtolower( $this->mCur->value );
if ( $this->mCur->type == AFPToken::TKEYWORD
&& in_array( $keyword, array_keys( self::$mKeywords ) )
) {
$func = self::$mKeywords[$keyword];
$this->move();
$r2 = new AFPData();
$this->doLevelUnarys( $r2 );
if ( $this->mShortCircuit ) {
return; // The result doesn't matter.
}
AbuseFilter::triggerLimiter();
wfProfileIn( __METHOD__ . "-$func" );
$result = AFPData::$func( $result, $r2, $this->mCur->pos );
wfProfileOut( __METHOD__ . "-$func" );
}
}
/**
* @param $result
*/
protected function doLevelUnarys( &$result ) {
$op = $this->mCur->value;
if ( $this->mCur->type == AFPToken::TOP && ( $op == "+" || $op == "-" ) ) {
$this->move();
$this->doLevelListElements( $result );
if ( $this->mShortCircuit ) {
return; // The result doesn't matter.
}
if ( $op == '-' ) {
$result = AFPData::unaryMinus( $result );
}
} else {
$this->doLevelListElements( $result );
}
}
/**
* @param $result
* @throws AFPUserVisibleException
*/
protected function doLevelListElements( &$result ) {
$this->doLevelBraces( $result );
while ( $this->mCur->type == AFPToken::TSQUAREBRACKET && $this->mCur->value == '[' ) {
$idx = new AFPData();
$this->doLevelSemicolon( $idx );
if ( !( $this->mCur->type == AFPToken::TSQUAREBRACKET && $this->mCur->value == ']' ) ) {
throw new AFPUserVisibleException( 'expectednotfound', $this->mCur->pos,
array( ']', $this->mCur->type, $this->mCur->value ) );
}
$idx = $idx->toInt();
if ( $result->type == AFPData::DLIST ) {
if ( count( $result->data ) <= $idx ) {
throw new AFPUserVisibleException( 'outofbounds', $this->mCur->pos,
array( $idx, count( $result->data ) ) );
}
$result = $result->data[$idx];
} else {
throw new AFPUserVisibleException( 'notlist', $this->mCur->pos, array() );
}
$this->move();
}
}
/**
* @param $result
* @throws AFPUserVisibleException
*/
protected function doLevelBraces( &$result ) {
if ( $this->mCur->type == AFPToken::TBRACE && $this->mCur->value == '(' ) {
if ( $this->mShortCircuit ) {
$this->skipOverBraces();
} else {
$this->doLevelSemicolon( $result );
}
if ( !( $this->mCur->type == AFPToken::TBRACE && $this->mCur->value == ')' ) ) {
throw new AFPUserVisibleException(
'expectednotfound',
$this->mCur->pos,
array( ')', $this->mCur->type, $this->mCur->value )
);
}
$this->move();
} else {
$this->doLevelFunction( $result );
}
}
/**
* @param $result
* @throws AFPUserVisibleException
*/
protected function doLevelFunction( &$result ) {
if ( $this->mCur->type == AFPToken::TID && isset( self::$mFunctions[$this->mCur->value] ) ) {
$func = self::$mFunctions[$this->mCur->value];
$this->move();
if ( $this->mCur->type != AFPToken::TBRACE || $this->mCur->value != '(' ) {
throw new AFPUserVisibleException( 'expectednotfound',
$this->mCur->pos,
array(
'(',
$this->mCur->type,
$this->mCur->value
)
);
}
if ( $this->mShortCircuit ) {
$this->skipOverBraces();
$this->move();
return; // The result doesn't matter.
}
wfProfileIn( __METHOD__ . '-loadargs' );
$args = array();
do {
$r = new AFPData();
$this->doLevelSemicolon( $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(
')',
$this->mCur->type,
$this->mCur->value
)
);
}
$this->move();
wfProfileOut( __METHOD__ . '-loadargs' );
wfProfileIn( __METHOD__ . "-$func" );
$funcHash = md5( $func . serialize( $args ) );
if ( isset( self::$funcCache[$funcHash] ) &&
!in_array( $func, self::$ActiveFunctions )
) {
$result = self::$funcCache[$funcHash];
} else {
AbuseFilter::triggerLimiter();
$result = self::$funcCache[$funcHash] = $this->$func( $args );
}
if ( count( self::$funcCache ) > 1000 ) {
self::$funcCache = array();
}
wfProfileOut( __METHOD__ . "-$func" );
} else {
$this->doLevelAtom( $result );
}
}
/**
* @param $result
* @throws AFPUserVisibleException
* @return AFPData
*/
protected function doLevelAtom( &$result ) {
$tok = $this->mCur->value;
switch ( $this->mCur->type ) {
case AFPToken::TID:
if ( $this->mShortCircuit ) {
break;
}
$var = strtolower( $tok );
$result = $this->getVarValue( $var );
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::TNONE:
return; // Handled at entry level
case AFPToken::TBRACE:
if ( $this->mCur->value == ')' ) {
return; // Handled at the entry level
}
case AFPToken::TSQUAREBRACKET:
if ( $this->mCur->value == '[' ) {
$list = array();
while ( true ) {
$this->move();
if ( $this->mCur->type == AFPToken::TSQUAREBRACKET && $this->mCur->value == ']' ) {
break;
}
$item = new AFPData();
$this->doLevelSet( $item );
$list[] = $item;
if ( $this->mCur->type == AFPToken::TSQUAREBRACKET && $this->mCur->value == ']' ) {
break;
}
if ( $this->mCur->type != AFPToken::TCOMMA ) {
throw new AFPUserVisibleException(
'expectednotfound',
$this->mCur->pos,
array( ', or ]', $this->mCur->type, $this->mCur->value )
);
}
}
$result = new AFPData( AFPData::DLIST, $list );
break;
}
default:
throw new AFPUserVisibleException(
'unexpectedtoken',
$this->mCur->pos,
array(
$this->mCur->type,
$this->mCur->value
)
);
}
$this->move();
}
/* End of levels */
/**
* @param $var
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function getVarValue( $var ) {
$var = strtolower( $var );
$builderValues = AbuseFilter::getBuilderValues();
if ( !( array_key_exists( $var, $builderValues['vars'] )
|| $this->mVars->varIsSet( $var ) )
) {
// If the variable is invalid, throw an exception
throw new AFPUserVisibleException(
'unrecognisedvar',
$this->mCur->pos,
array( $var )
);
} else {
return $this->mVars->getVar( $var );
}
}
/**
* @param $name
* @param $value
* @throws AFPUserVisibleException
*/
protected function setUserVariable( $name, $value ) {
$builderValues = AbuseFilter::getBuilderValues();
if ( array_key_exists( $name, $builderValues['vars'] ) ) {
throw new AFPUserVisibleException( 'overridebuiltin', $this->mCur->pos, array( $name ) );
}
$this->mVars->setVar( $name, $value );
}
// Built-in functions
/**
* @param $args
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcLc( $args ) {
global $wgContLang;
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'lc', 2, count( $args ) )
);
}
$s = $args[0]->toString();
return new AFPData( AFPData::DSTRING, $wgContLang->lc( $s ) );
}
/**
* @param $args
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcUc( $args ) {
global $wgContLang;
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'uc', 2, count( $args ) )
);
}
$s = $args[0]->toString();
return new AFPData( AFPData::DSTRING, $wgContLang->uc( $s ) );
}
/**
* @param $args
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcLen( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'len', 2, count( $args ) )
);
}
if ( $args[0]->type == AFPData::DLIST ) {
// Don't use toString on lists, but count
return new AFPData( AFPData::DINT, count( $args[0]->data ) );
}
$s = $args[0]->toString();
return new AFPData( AFPData::DINT, mb_strlen( $s, 'utf-8' ) );
}
/**
* @param $args
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcSimpleNorm( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'simplenorm', 2, count( $args ) )
);
}
$s = $args[0]->toString();
$s = preg_replace( '/[\d\W]+/', '', $s );
$s = strtolower( $s );
return new AFPData( AFPData::DSTRING, $s );
}
/**
* @param $args
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcSpecialRatio( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'specialratio', 1, count( $args ) )
);
}
$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 );
}
/**
* @param $args
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcCount( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'count', 1, count( $args ) )
);
}
if ( $args[0]->type == AFPData::DLIST && count( $args ) == 1 ) {
return new AFPData( AFPData::DINT, count( $args[0]->data ) );
}
if ( count( $args ) == 1 ) {
$count = count( explode( ',', $args[0]->toString() ) );
} else {
$needle = $args[0]->toString();
$haystack = $args[1]->toString();
// Bug #60203: Keep empty parameters from causing PHP warnings
if ( $needle === '' ) {
$count = 0;
} else {
$count = substr_count( $haystack, $needle );
}
}
return new AFPData( AFPData::DINT, $count );
}
/**
* @param $args
* @return AFPData
* @throws AFPUserVisibleException
* @throws Exception
*/
protected function funcRCount( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'rcount', 1, count( $args ) )
);
}
if ( count( $args ) == 1 ) {
$count = count( explode( ',', $args[0]->toString() ) );
} else {
$needle = $args[0]->toString();
$haystack = $args[1]->toString();
# Munge the regex
$needle = preg_replace( '!(\\\\\\\\)*(\\\\)?/!', '$1\/', $needle );
$needle = "/$needle/u";
// Omit the '$matches' argument to avoid computing them, just count.
$count = preg_match_all( $needle, $haystack );
if ( $count === false ) {
throw new AFPUserVisibleException(
'regexfailure',
$this->mCur->pos,
array( 'unspecified error in preg_match_all()', $needle )
);
}
}
return new AFPData( AFPData::DINT, $count );
}
/**
* @param $args
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcIPInRange( $args ) {
if ( count( $args ) < 2 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'ip_in_range', 2, count( $args ) )
);
}
$ip = $args[0]->toString();
$range = $args[1]->toString();
$result = IP::isInRange( $ip, $range );
return new AFPData( AFPData::DBOOL, $result );
}
/**
* @param $args
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcCCNorm( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'ccnorm', 1, count( $args ) )
);
}
$s = $args[0]->toString();
$s = html_entity_decode( $s, ENT_QUOTES, 'UTF-8' );
$s = $this->ccnorm( $s );
return new AFPData( AFPData::DSTRING, $s );
}
/**
* @param $args array
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcContainsAny( $args ) {
if ( count( $args ) < 2 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'contains_any', 2, count( $args ) )
);
}
$s = array_shift( $args );
$s = $s->toString();
$searchStrings = array();
foreach ( $args as $arg ) {
$searchStrings[] = $arg->toString();
}
if ( function_exists( 'fss_prep_search' ) ) {
$fss = fss_prep_search( $searchStrings );
$result = fss_exec_search( $fss, $s );
$ok = is_array( $result );
} else {
$ok = false;
foreach ( $searchStrings as $needle ) {
// Bug #60203: Keep empty parameters from causing PHP warnings
if ( $needle !== '' && strpos( $s, $needle ) !== false ) {
$ok = true;
break;
}
}
}
return new AFPData( AFPData::DBOOL, $ok );
}
/**
* @param $s
* @return mixed
*/
protected function ccnorm( $s ) {
static $replacementArray = null;
if ( is_null( $replacementArray ) ) {
global $wgExtensionDirectory;
if ( is_readable( "$wgExtensionDirectory/AntiSpoof/equivset.php" ) ) {
// Satisfy analyzer.
$equivset = null;
// Contains a map of characters in $equivset.
require "$wgExtensionDirectory/AntiSpoof/equivset.php";
// strtr in ReplacementArray->replace() doesn't like this.
if ( isset( $equivset[''] ) ) {
unset( $equivset[''] );
}
$replacementArray = new ReplacementArray( $equivset );
} else {
// AntiSpoof isn't available, so just create a dummy
wfDebugLog(
'AbuseFilter',
"Can't compute normalized string (ccnorm) as the AntiSpoof Extension isn't installed."
);
$replacementArray = new ReplacementArray( array() );
}
}
return $replacementArray->replace( $s );
}
/**
* @param $s string
* @return array|string
*/
protected function rmspecials( $s ) {
return preg_replace( '/[^\p{L}\p{N}]/u', '', $s );
}
/**
* @param $s string
* @return array|string
*/
protected function rmdoubles( $s ) {
return preg_replace( '/(.)\1+/us', '\1', $s );
}
/**
* @param $s string
* @return array|string
*/
protected function rmwhitespace( $s ) {
return preg_replace( '/\s+/u', '', $s );
}
/**
* @param $args array
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcRMSpecials( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'rmspecials', 1, count( $args ) )
);
}
$s = $args[0]->toString();
$s = $this->rmspecials( $s );
return new AFPData( AFPData::DSTRING, $s );
}
/**
* @param $args array
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcRMWhitespace( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'rmwhitespace', 1, count( $args ) )
);
}
$s = $args[0]->toString();
$s = $this->rmwhitespace( $s );
return new AFPData( AFPData::DSTRING, $s );
}
/**
* @param $args array
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcRMDoubles( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'rmdoubles', 1, count( $args ) )
);
}
$s = $args[0]->toString();
$s = $this->rmdoubles( $s );
return new AFPData( AFPData::DSTRING, $s );
}
/**
* @param $args array
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcNorm( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'norm', 1, count( $args ) )
);
}
$s = $args[0]->toString();
$s = $this->ccnorm( $s );
$s = $this->rmdoubles( $s );
$s = $this->rmspecials( $s );
$s = $this->rmwhitespace( $s );
return new AFPData( AFPData::DSTRING, $s );
}
/**
* @param $args array
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcSubstr( $args ) {
if ( count( $args ) < 2 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'substr', 2, count( $args ) )
);
}
$s = $args[0]->toString();
$offset = $args[1]->toInt();
if ( isset( $args[2] ) ) {
$length = $args[2]->toInt();
$result = mb_substr( $s, $offset, $length );
} else {
$result = mb_substr( $s, $offset );
}
return new AFPData( AFPData::DSTRING, $result );
}
/**
* @param $args array
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcStrPos( $args ) {
if ( count( $args ) < 2 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'strpos', 2, count( $args ) )
);
}
$haystack = $args[0]->toString();
$needle = $args[1]->toString();
// Bug #60203: Keep empty parameters from causing PHP warnings
if ( $needle === '' ) {
return new AFPData( AFPData::DINT, -1 );
}
if ( isset( $args[2] ) ) {
$offset = $args[2]->toInt();
$result = mb_strpos( $haystack, $needle, $offset );
} else {
$result = mb_strpos( $haystack, $needle );
}
if ( $result === false ) {
$result = -1;
}
return new AFPData( AFPData::DINT, $result );
}
/**
* @param $args array
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcStrReplace( $args ) {
if ( count( $args ) < 3 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'str_replace', 3, count( $args ) )
);
}
$subject = $args[0]->toString();
$search = $args[1]->toString();
$replace = $args[2]->toString();
return new AFPData( AFPData::DSTRING, str_replace( $search, $replace, $subject ) );
}
/**
* @param $args array
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function funcStrRegexEscape( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException( 'notenoughargs', $this->mCur->pos,
array( 'rescape', 1, count( $args ) ) );
}
$string = $args[0]->toString();
// preg_quote does not need the second parameter, since rlike takes
// care of the delimiter symbol itself
return new AFPData( AFPData::DSTRING, preg_quote( $string ) );
}
/**
* @param $args array
* @return mixed
* @throws AFPUserVisibleException
*/
protected function funcSetVar( $args ) {
if ( count( $args ) < 2 ) {
throw new AFPUserVisibleException(
'notenoughargs',
$this->mCur->pos,
array( 'set_var', 2, count( $args ) )
);
}
$varName = $args[0]->toString();
$value = $args[1];
$this->setUserVariable( $varName, $value );
return $value;
}
/**
* @param $args array
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function castString( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException( 'noparams', $this->mCur->pos, array( __METHOD__ ) );
}
$val = $args[0];
return AFPData::castTypes( $val, AFPData::DSTRING );
}
/**
* @param $args array
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function castInt( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException( 'noparams', $this->mCur->pos, array( __METHOD__ ) );
}
$val = $args[0];
return AFPData::castTypes( $val, AFPData::DINT );
}
/**
* @param $args array
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function castFloat( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException( 'noparams', $this->mCur->pos, array( __METHOD__ ) );
}
$val = $args[0];
return AFPData::castTypes( $val, AFPData::DFLOAT );
}
/**
* @param $args array
* @return AFPData
* @throws AFPUserVisibleException
*/
protected function castBool( $args ) {
if ( count( $args ) < 1 ) {
throw new AFPUserVisibleException( 'noparams', $this->mCur->pos, array( __METHOD__ ) );
}
$val = $args[0];
return AFPData::castTypes( $val, AFPData::DBOOL );
}
}
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