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<?php
class ExtParserFunctions {
static $mExprParser;
static $mTimeCache = array();
static $mTimeChars = 0;
static $mMaxTimeChars = 6000; # ~10 seconds
/**
* @param $parser Parser
* @return bool
*/
public static function clearState( $parser ) {
self::$mTimeChars = 0;
$parser->pf_markerRegex = null;
return true;
}
/**
* Register ParserClearState hook.
* We defer this until needed to avoid the loading of the code of this file
* when no parser function is actually called.
*/
public static function registerClearHook() {
static $done = false;
if( !$done ) {
global $wgHooks;
$wgHooks['ParserClearState'][] = __CLASS__ . '::clearState';
$done = true;
}
}
/**
* Get the marker regex. Cached.
* @param $parser Parser
* @return
*/
public static function getMarkerRegex( $parser ) {
self::registerClearHook();
if ( isset( $parser->pf_markerRegex ) ) {
return $parser->pf_markerRegex;
}
wfProfileIn( __METHOD__ );
$prefix = preg_quote( $parser->uniqPrefix(), '/' );
$suffix = preg_quote( Parser::MARKER_SUFFIX, '/' );
$parser->pf_markerRegex = '/' . $prefix . '(?:(?!' . $suffix . ').)*' . $suffix . '/us';
wfProfileOut( __METHOD__ );
return $parser->pf_markerRegex;
}
/**
* @param $parser Parser
* @param $text string
* @return string
*/
private static function killMarkers ( $parser, $text ) {
return preg_replace( self::getMarkerRegex( $parser ), '' , $text );
}
/**
* @return ExprParser
*/
public static function &getExprParser() {
if ( !isset( self::$mExprParser ) ) {
self::$mExprParser = new ExprParser;
}
return self::$mExprParser;
}
/**
* @param $parser Parser
* @param $expr string
* @return string
*/
public static function expr( $parser, $expr = '' ) {
try {
return self::getExprParser()->doExpression( $expr );
} catch ( ExprError $e ) {
return $e->getMessage();
}
}
/**
* @param $parser Parser
* @param $expr string
* @param $then string
* @param $else string
* @return string
*/
public static function ifexpr( $parser, $expr = '', $then = '', $else = '' ) {
try {
$ret = self::getExprParser()->doExpression( $expr );
if ( is_numeric( $ret ) ) {
$ret = floatval( $ret );
}
if ( $ret ) {
return $then;
} else {
return $else;
}
} catch ( ExprError $e ) {
return $e->getMessage();
}
}
/**
* @param $parser Parser
* @param $frame PPFrame
* @param $args array
* @return string
*/
public static function ifexprObj( $parser, $frame, $args ) {
$expr = isset( $args[0] ) ? trim( $frame->expand( $args[0] ) ) : '';
$then = isset( $args[1] ) ? $args[1] : '';
$else = isset( $args[2] ) ? $args[2] : '';
$result = self::ifexpr( $parser, $expr, $then, $else );
if ( is_object( $result ) ) {
$result = trim( $frame->expand( $result ) );
}
return $result;
}
/**
* @param $parser Parser
* @param $frame PPFrame
* @param $args array
* @return string
*/
public static function ifObj( $parser, $frame, $args ) {
$test = isset( $args[0] ) ? trim( $frame->expand( $args[0] ) ) : '';
if ( $test !== '' ) {
return isset( $args[1] ) ? trim( $frame->expand( $args[1] ) ) : '';
} else {
return isset( $args[2] ) ? trim( $frame->expand( $args[2] ) ) : '';
}
}
/**
* @param $parser Parser
* @param $frame PPFrame
* @param $args array
* @return string
*/
public static function ifeqObj( $parser, $frame, $args ) {
$left = isset( $args[0] ) ? trim( $frame->expand( $args[0] ) ) : '';
$right = isset( $args[1] ) ? trim( $frame->expand( $args[1] ) ) : '';
if ( $left == $right ) {
return isset( $args[2] ) ? trim( $frame->expand( $args[2] ) ) : '';
} else {
return isset( $args[3] ) ? trim( $frame->expand( $args[3] ) ) : '';
}
}
/**
* @param $parser Parser
* @param $test string
* @param $then string
* @param $else bool
* @return bool|string
*/
public static function iferror( $parser, $test = '', $then = '', $else = false ) {
if ( preg_match( '/<(?:strong|span|p|div)\s(?:[^\s>]*\s+)*?class="(?:[^"\s>]*\s+)*?error(?:\s[^">]*)?"/', $test ) ) {
return $then;
} elseif ( $else === false ) {
return $test;
} else {
return $else;
}
}
/**
* @param $parser Parser
* @param $frame PPFrame
* @param $args array
* @return string
*/
public static function iferrorObj( $parser, $frame, $args ) {
$test = isset( $args[0] ) ? trim( $frame->expand( $args[0] ) ) : '';
$then = isset( $args[1] ) ? $args[1] : false;
$else = isset( $args[2] ) ? $args[2] : false;
$result = self::iferror( $parser, $test, $then, $else );
if ( $result === false ) {
return '';
} else {
return trim( $frame->expand( $result ) );
}
}
/**
* @param $parser Parser
* @param $frame PPFrame
* @param $args
* @return string
*/
public static function switchObj( $parser, $frame, $args ) {
if ( count( $args ) == 0 ) {
return '';
}
$primary = trim( $frame->expand( array_shift( $args ) ) );
$found = $defaultFound = false;
$default = null;
$lastItemHadNoEquals = false;
$mwDefault =& MagicWord::get( 'default' );
foreach ( $args as $arg ) {
$bits = $arg->splitArg();
$nameNode = $bits['name'];
$index = $bits['index'];
$valueNode = $bits['value'];
if ( $index === '' ) {
# Found "="
$lastItemHadNoEquals = false;
if ( $found ) {
# Multiple input match
return trim( $frame->expand( $valueNode ) );
} else {
$test = trim( $frame->expand( $nameNode ) );
if ( $test == $primary ) {
# Found a match, return now
return trim( $frame->expand( $valueNode ) );
} elseif ( $defaultFound || $mwDefault->matchStartAndRemove( $test ) ) {
$default = $valueNode;
} # else wrong case, continue
}
} else {
# Multiple input, single output
# If the value matches, set a flag and continue
$lastItemHadNoEquals = true;
$test = trim( $frame->expand( $valueNode ) );
if ( $test == $primary ) {
$found = true;
} elseif ( $mwDefault->matchStartAndRemove( $test ) ) {
$defaultFound = true;
}
}
}
# Default case
# Check if the last item had no = sign, thus specifying the default case
if ( $lastItemHadNoEquals ) {
return $test;
} elseif ( !is_null( $default ) ) {
return trim( $frame->expand( $default ) );
} else {
return '';
}
}
/**
* Returns the absolute path to a subpage, relative to the current article
* title. Treats titles as slash-separated paths.
*
* Following subpage link syntax instead of standard path syntax, an
* initial slash is treated as a relative path, and vice versa.
*
* @param $parser Parser
* @param $to string
* @param $from string
*
* @return string
*/
public static function rel2abs( $parser , $to = '' , $from = '' ) {
$from = trim( $from );
if ( $from == '' ) {
$from = $parser->getTitle()->getPrefixedText();
}
$to = rtrim( $to , ' /' );
// if we have an empty path, or just one containing a dot
if ( $to == '' || $to == '.' ) {
return $from;
}
// if the path isn't relative
if ( substr( $to , 0 , 1 ) != '/' &&
substr( $to , 0 , 2 ) != './' &&
substr( $to , 0 , 3 ) != '../' &&
$to != '..' )
{
$from = '';
}
// Make a long path, containing both, enclose it in /.../
$fullPath = '/' . $from . '/' . $to . '/';
// remove redundant current path dots
$fullPath = preg_replace( '!/(\./)+!', '/', $fullPath );
// remove double slashes
$fullPath = preg_replace( '!/{2,}!', '/', $fullPath );
// remove the enclosing slashes now
$fullPath = trim( $fullPath , '/' );
$exploded = explode ( '/' , $fullPath );
$newExploded = array();
foreach ( $exploded as $current ) {
if ( $current == '..' ) { // removing one level
if ( !count( $newExploded ) ) {
// attempted to access a node above root node
$msg = wfMessage( 'pfunc_rel2abs_invalid_depth', $fullPath )->inContentLanguage()->escaped();
return '<strong class="error">' . $msg . '</strong>';
}
// remove last level from the stack
array_pop( $newExploded );
} else {
// add the current level to the stack
$newExploded[] = $current;
}
}
// we can now join it again
return implode( '/' , $newExploded );
}
/**
* @param $parser Parser
* @param $frame PPFrame
* @param $titletext string
* @param $then string
* @param $else string
*
* @return string
*/
public static function ifexistCommon( $parser, $frame, $titletext = '', $then = '', $else = '' ) {
global $wgContLang;
$title = Title::newFromText( $titletext );
$wgContLang->findVariantLink( $titletext, $title, true );
if ( $title ) {
if ( $title->getNamespace() == NS_MEDIA ) {
/* If namespace is specified as NS_MEDIA, then we want to
* check the physical file, not the "description" page.
*/
if ( !$parser->incrementExpensiveFunctionCount() ) {
return $else;
}
$file = wfFindFile( $title );
if ( !$file ) {
return $else;
}
$parser->mOutput->addImage(
$file->getName(), $file->getTimestamp(), $file->getSha1() );
return $file->exists() ? $then : $else;
} elseif ( $title->getNamespace() == NS_SPECIAL ) {
/* Don't bother with the count for special pages,
* since their existence can be checked without
* accessing the database.
*/
return SpecialPageFactory::exists( $title->getDBkey() ) ? $then : $else;
} elseif ( $title->isExternal() ) {
/* Can't check the existence of pages on other sites,
* so just return $else. Makes a sort of sense, since
* they don't exist _locally_.
*/
return $else;
} else {
$pdbk = $title->getPrefixedDBkey();
if ( !$parser->incrementExpensiveFunctionCount() ) {
return $else;
}
$lc = LinkCache::singleton();
$id = $lc->getGoodLinkID( $pdbk );
if ( $id != 0 ) {
$parser->mOutput->addLink( $title, $id );
return $then;
} elseif ( $lc->isBadLink( $pdbk ) ) {
$parser->mOutput->addLink( $title, 0 );
return $else;
}
$id = $title->getArticleID();
$parser->mOutput->addLink( $title, $id );
if ( $id ) {
return $then;
}
}
}
return $else;
}
/**
* @param $parser Parser
* @param $frame PPFrame
* @param $args array
* @return string
*/
public static function ifexistObj( $parser, $frame, $args ) {
$title = isset( $args[0] ) ? trim( $frame->expand( $args[0] ) ) : '';
$then = isset( $args[1] ) ? $args[1] : null;
$else = isset( $args[2] ) ? $args[2] : null;
$result = self::ifexistCommon( $parser, $frame, $title, $then, $else );
if ( $result === null ) {
return '';
} else {
return trim( $frame->expand( $result ) );
}
}
/**
* @param $parser Parser
* @param $format string
* @param $date string
* @param $language string
* @param $local string|bool
* @return string
*/
public static function time( $parser, $format = '', $date = '', $language = '', $local = false ) {
global $wgLocaltimezone;
self::registerClearHook();
if ( $date === '' ) {
$cacheKey = $parser->getOptions()->getTimestamp();
$timestamp = new MWTimestamp( $cacheKey );
$date = $timestamp->getTimestamp( TS_ISO_8601 );
} else {
$cacheKey = $date;
}
if ( isset( self::$mTimeCache[$format][$cacheKey][$language][$local] ) ) {
return self::$mTimeCache[$format][$cacheKey][$language][$local];
}
# compute the timestamp string $ts
# PHP >= 5.2 can handle dates before 1970 or after 2038 using the DateTime object
$invalidTime = false;
# the DateTime constructor must be used because it throws exceptions
# when errors occur, whereas date_create appears to just output a warning
# that can't really be detected from within the code
try {
# Default input timezone is UTC.
$utc = new DateTimeZone( 'UTC' );
# Correct for DateTime interpreting 'XXXX' as XX:XX o'clock
if ( preg_match( '/^[0-9]{4}$/', $date ) ) {
$date = '00:00 '.$date;
}
# Parse date
# UTC is a default input timezone.
$dateObject = new DateTime( $date, $utc );
# Set output timezone.
if ( $local ) {
if ( isset( $wgLocaltimezone ) ) {
$tz = new DateTimeZone( $wgLocaltimezone );
} else {
$tz = new DateTimeZone( date_default_timezone_get() );
}
$dateObject->setTimezone( $tz );
} else {
$dateObject->setTimezone( $utc );
}
# Generate timestamp
$ts = $dateObject->format( 'YmdHis' );
} catch ( Exception $ex ) {
$invalidTime = true;
}
# format the timestamp and return the result
if ( $invalidTime ) {
$result = '<strong class="error">' . wfMessage( 'pfunc_time_error' )->inContentLanguage()->escaped() . '</strong>';
} else {
self::$mTimeChars += strlen( $format );
if ( self::$mTimeChars > self::$mMaxTimeChars ) {
return '<strong class="error">' . wfMessage( 'pfunc_time_too_long' )->inContentLanguage()->escaped() . '</strong>';
} else {
if ( $ts < 100000000000000 ) { // Language can't deal with years after 9999
if ( $language !== '' && Language::isValidBuiltInCode( $language ) ) {
// use whatever language is passed as a parameter
$langObject = Language::factory( $language );
$result = $langObject->sprintfDate( $format, $ts );
} else {
// use wiki's content language
$result = $parser->getFunctionLang()->sprintfDate( $format, $ts );
}
} else {
return '<strong class="error">' . wfMessage( 'pfunc_time_too_big' )->inContentLanguage()->escaped() . '</strong>';
}
}
}
self::$mTimeCache[$format][$cacheKey][$language][$local] = $result;
return $result;
}
/**
* @param $parser Parser
* @param $format string
* @param $date string
* @param $language string
* @return string
*/
public static function localTime( $parser, $format = '', $date = '', $language = '' ) {
return self::time( $parser, $format, $date, $language, true );
}
/**
* Obtain a specified number of slash-separated parts of a title,
* e.g. {{#titleparts:Hello/World|1}} => "Hello"
*
* @param $parser Parser Parent parser
* @param $title string Title to split
* @param $parts int Number of parts to keep
* @param $offset int Offset starting at 1
* @return string
*/
public static function titleparts( $parser, $title = '', $parts = 0, $offset = 0 ) {
$parts = intval( $parts );
$offset = intval( $offset );
$ntitle = Title::newFromText( $title );
if ( $ntitle instanceof Title ) {
$bits = explode( '/', $ntitle->getPrefixedText(), 25 );
if ( count( $bits ) <= 0 ) {
return $ntitle->getPrefixedText();
} else {
if ( $offset > 0 ) {
--$offset;
}
if ( $parts == 0 ) {
return implode( '/', array_slice( $bits, $offset ) );
} else {
return implode( '/', array_slice( $bits, $offset, $parts ) );
}
}
} else {
return $title;
}
}
/**
* Verifies parameter is less than max string length.
* @param $text
* @return bool
*/
private static function checkLength( $text ) {
global $wgPFStringLengthLimit;
return ( mb_strlen( $text ) < $wgPFStringLengthLimit );
}
/**
* Generates error message. Called when string is too long.
* @return string
*/
private static function tooLongError() {
global $wgPFStringLengthLimit;
$msg = wfMessage( 'pfunc_string_too_long' )->numParams( $wgPFStringLengthLimit );
return '<strong class="error">' . $msg->inContentLanguage()->escaped() . '</strong>';
}
/**
* {{#len:string}}
*
* Reports number of characters in string.
* @param $parser Parser
* @param $inStr string
* @return int
*/
public static function runLen ( $parser, $inStr = '' ) {
wfProfileIn( __METHOD__ );
$inStr = self::killMarkers( $parser, (string)$inStr );
$len = mb_strlen( $inStr );
wfProfileOut( __METHOD__ );
return $len;
}
/**
* {{#pos: string | needle | offset}}
*
* Finds first occurrence of "needle" in "string" starting at "offset".
*
* Note: If the needle is an empty string, single space is used instead.
* Note: If the needle is not found, empty string is returned.
* @param $parser Parser
* @param $inStr string
* @param $inNeedle int|string
* @param $inOffset int
* @return int|string
*/
public static function runPos ( $parser, $inStr = '', $inNeedle = '', $inOffset = 0 ) {
wfProfileIn( __METHOD__ );
$inStr = self::killMarkers( $parser, (string)$inStr );
$inNeedle = self::killMarkers( $parser, (string)$inNeedle );
if ( !self::checkLength( $inStr ) ||
!self::checkLength( $inNeedle ) ) {
wfProfileOut( __METHOD__ );
return self::tooLongError();
}
if ( $inNeedle == '' ) { $inNeedle = ' '; }
$pos = mb_strpos( $inStr, $inNeedle, $inOffset );
if ( $pos === false ) { $pos = ""; }
wfProfileOut( __METHOD__ );
return $pos;
}
/**
* {{#rpos: string | needle}}
*
* Finds last occurrence of "needle" in "string".
*
* Note: If the needle is an empty string, single space is used instead.
* Note: If the needle is not found, -1 is returned.
* @param $parser Parser
* @param $inStr string
* @param $inNeedle int|string
* @return int|string
*/
public static function runRPos ( $parser, $inStr = '', $inNeedle = '' ) {
wfProfileIn( __METHOD__ );
$inStr = self::killMarkers( $parser, (string)$inStr );
$inNeedle = self::killMarkers( $parser, (string)$inNeedle );
if ( !self::checkLength( $inStr ) ||
!self::checkLength( $inNeedle ) ) {
wfProfileOut( __METHOD__ );
return self::tooLongError();
}
if ( $inNeedle == '' ) { $inNeedle = ' '; }
$pos = mb_strrpos( $inStr, $inNeedle );
if ( $pos === false ) { $pos = -1; }
wfProfileOut( __METHOD__ );
return $pos;
}
/**
* {{#sub: string | start | length }}
*
* Returns substring of "string" starting at "start" and having
* "length" characters.
*
* Note: If length is zero, the rest of the input is returned.
* Note: A negative value for "start" operates from the end of the
* "string".
* Note: A negative value for "length" returns a string reduced in
* length by that amount.
*
* @param $parser Parser
* @param $inStr string
* @param $inStart int
* @param $inLength int
* @return string
*/
public static function runSub ( $parser, $inStr = '', $inStart = 0, $inLength = 0 ) {
wfProfileIn( __METHOD__ );
$inStr = self::killMarkers( $parser, (string)$inStr );
if ( !self::checkLength( $inStr ) ) {
wfProfileOut( __METHOD__ );
return self::tooLongError();
}
if ( intval( $inLength ) == 0 ) {
$result = mb_substr( $inStr, $inStart );
} else {
$result = mb_substr( $inStr, intval( $inStart ), intval( $inLength ) );
}
wfProfileOut( __METHOD__ );
return $result;
}
/**
* {{#count: string | substr }}
*
* Returns number of occurrences of "substr" in "string".
*
* Note: If "substr" is empty, a single space is used.
* @param $parser
* @param $inStr string
* @param $inSubStr string
* @return int|string
*/
public static function runCount ( $parser, $inStr = '', $inSubStr = '' ) {
wfProfileIn( __METHOD__ );
$inStr = self::killMarkers( $parser, (string)$inStr );
$inSubStr = self::killMarkers( $parser, (string)$inSubStr );
if ( !self::checkLength( $inStr ) ||
!self::checkLength( $inSubStr ) ) {
wfProfileOut( __METHOD__ );
return self::tooLongError();
}
if ( $inSubStr == '' ) {
$inSubStr = ' ';
}
$result = mb_substr_count( $inStr, $inSubStr );
wfProfileOut( __METHOD__ );
return $result;
}
/**
* {{#replace:string | from | to | limit }}
*
* Replaces each occurrence of "from" in "string" with "to".
* At most "limit" replacements are performed.
*
* Note: Armored against replacements that would generate huge strings.
* Note: If "from" is an empty string, single space is used instead.
* @param $parser Parser
* @param $inStr string
* @param $inReplaceFrom string
* @param $inReplaceTo string
* @param $inLimit int
* @return mixed|string
*/
public static function runReplace( $parser, $inStr = '',
$inReplaceFrom = '', $inReplaceTo = '', $inLimit = -1 ) {
global $wgPFStringLengthLimit;
wfProfileIn( __METHOD__ );
$inStr = self::killMarkers( $parser, (string)$inStr );
$inReplaceFrom = self::killMarkers( $parser, (string)$inReplaceFrom );
$inReplaceTo = self::killMarkers( $parser, (string)$inReplaceTo );
if ( !self::checkLength( $inStr ) ||
!self::checkLength( $inReplaceFrom ) ||
!self::checkLength( $inReplaceTo ) ) {
wfProfileOut( __METHOD__ );
return self::tooLongError();
}
if ( $inReplaceFrom == '' ) { $inReplaceFrom = ' '; }
// Precompute limit to avoid generating enormous string:
$diff = mb_strlen( $inReplaceTo ) - mb_strlen( $inReplaceFrom );
if ( $diff > 0 ) {
$limit = ( ( $wgPFStringLengthLimit - mb_strlen( $inStr ) ) / $diff ) + 1;
} else {
$limit = -1;
}
$inLimit = intval( $inLimit );
if ( $inLimit >= 0 ) {
if ( $limit > $inLimit || $limit == -1 ) { $limit = $inLimit; }
}
// Use regex to allow limit and handle UTF-8 correctly.
$inReplaceFrom = preg_quote( $inReplaceFrom, '/' );
$inReplaceTo = StringUtils::escapeRegexReplacement( $inReplaceTo );
$result = preg_replace( '/' . $inReplaceFrom . '/u',
$inReplaceTo, $inStr, $limit );
if ( !self::checkLength( $result ) ) {
wfProfileOut( __METHOD__ );
return self::tooLongError();
}
wfProfileOut( __METHOD__ );
return $result;
}
/**
* {{#explode:string | delimiter | position | limit}}
*
* Breaks "string" into chunks separated by "delimiter" and returns the
* chunk identified by "position".
*
* Note: Negative position can be used to specify tokens from the end.
* Note: If the divider is an empty string, single space is used instead.
* Note: Empty string is returned if there are not enough exploded chunks.
* @param $parser Parser
* @param $inStr string
* @param $inDiv string
* @param $inPos int
* @param $inLim int|null
* @return string
*/
public static function runExplode ( $parser, $inStr = '', $inDiv = '', $inPos = 0, $inLim = null ) {
wfProfileIn( __METHOD__ );
$inStr = self::killMarkers( $parser, (string)$inStr );
$inDiv = self::killMarkers( $parser, (string)$inDiv );
if ( $inDiv == '' ) {
$inDiv = ' ';
}
if ( !self::checkLength( $inStr ) ||
!self::checkLength( $inDiv ) ) {
wfProfileOut( __METHOD__ );
return self::tooLongError();
}
$inDiv = preg_quote( $inDiv, '/' );
$matches = preg_split( '/' . $inDiv . '/u', $inStr, $inLim );
if ( $inPos >= 0 && isset( $matches[$inPos] ) ) {
$result = $matches[$inPos];
} elseif ( $inPos < 0 && isset( $matches[count( $matches ) + $inPos] ) ) {
$result = $matches[count( $matches ) + $inPos];
} else {
$result = '';
}
wfProfileOut( __METHOD__ );
return $result;
}
/**
* {{#urldecode:string}}
*
* Decodes URL-encoded (like%20that) strings.
* @param $parser Parser
* @param $inStr string
* @return string
*/
public static function runUrlDecode( $parser, $inStr = '' ) {
wfProfileIn( __METHOD__ );
$inStr = self::killMarkers( $parser, (string)$inStr );
if ( !self::checkLength( $inStr ) ) {
wfProfileOut( __METHOD__ );
return self::tooLongError();
}
$result = urldecode( $inStr );
wfProfileOut( __METHOD__ );
return $result;
}
}
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