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<?php
/**
* See docs/magicword.txt.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Parser
*/
use MediaWiki\Logger\LoggerFactory;
/**
* Class for handling an array of magic words
* @ingroup Parser
*/
class MagicWordArray {
/** @var array */
public $names = [];
/** @var array */
private $hash;
private $baseRegex;
private $regex;
/**
* @param array $names
*/
public function __construct( $names = [] ) {
$this->names = $names;
}
/**
* Add a magic word by name
*
* @param string $name
*/
public function add( $name ) {
$this->names[] = $name;
$this->hash = $this->baseRegex = $this->regex = null;
}
/**
* Add a number of magic words by name
*
* @param array $names
*/
public function addArray( $names ) {
$this->names = array_merge( $this->names, array_values( $names ) );
$this->hash = $this->baseRegex = $this->regex = null;
}
/**
* Get a 2-d hashtable for this array
* @return array
*/
public function getHash() {
if ( is_null( $this->hash ) ) {
global $wgContLang;
$this->hash = [ 0 => [], 1 => [] ];
foreach ( $this->names as $name ) {
$magic = MagicWord::get( $name );
$case = intval( $magic->isCaseSensitive() );
foreach ( $magic->getSynonyms() as $syn ) {
if ( !$case ) {
$syn = $wgContLang->lc( $syn );
}
$this->hash[$case][$syn] = $name;
}
}
}
return $this->hash;
}
/**
* Get the base regex
* @return array
*/
public function getBaseRegex() {
if ( is_null( $this->baseRegex ) ) {
$this->baseRegex = [ 0 => '', 1 => '' ];
foreach ( $this->names as $name ) {
$magic = MagicWord::get( $name );
$case = intval( $magic->isCaseSensitive() );
foreach ( $magic->getSynonyms() as $i => $syn ) {
// Group name must start with a non-digit in PCRE 8.34+
$it = strtr( $i, '0123456789', 'abcdefghij' );
$group = "(?P<{$it}_{$name}>" . preg_quote( $syn, '/' ) . ')';
if ( $this->baseRegex[$case] === '' ) {
$this->baseRegex[$case] = $group;
} else {
$this->baseRegex[$case] .= '|' . $group;
}
}
}
}
return $this->baseRegex;
}
/**
* Get an unanchored regex that does not match parameters
* @return array
*/
public function getRegex() {
if ( is_null( $this->regex ) ) {
$base = $this->getBaseRegex();
$this->regex = [ '', '' ];
if ( $this->baseRegex[0] !== '' ) {
$this->regex[0] = "/{$base[0]}/iuS";
}
if ( $this->baseRegex[1] !== '' ) {
$this->regex[1] = "/{$base[1]}/S";
}
}
return $this->regex;
}
/**
* Get a regex for matching variables with parameters
*
* @return string
*/
public function getVariableRegex() {
return str_replace( "\\$1", "(.*?)", $this->getRegex() );
}
/**
* Get a regex anchored to the start of the string that does not match parameters
*
* @return array
*/
public function getRegexStart() {
$base = $this->getBaseRegex();
$newRegex = [ '', '' ];
if ( $base[0] !== '' ) {
$newRegex[0] = "/^(?:{$base[0]})/iuS";
}
if ( $base[1] !== '' ) {
$newRegex[1] = "/^(?:{$base[1]})/S";
}
return $newRegex;
}
/**
* Get an anchored regex for matching variables with parameters
*
* @return array
*/
public function getVariableStartToEndRegex() {
$base = $this->getBaseRegex();
$newRegex = [ '', '' ];
if ( $base[0] !== '' ) {
$newRegex[0] = str_replace( "\\$1", "(.*?)", "/^(?:{$base[0]})$/iuS" );
}
if ( $base[1] !== '' ) {
$newRegex[1] = str_replace( "\\$1", "(.*?)", "/^(?:{$base[1]})$/S" );
}
return $newRegex;
}
/**
* @since 1.20
* @return array
*/
public function getNames() {
return $this->names;
}
/**
* Parse a match array from preg_match
* Returns array(magic word ID, parameter value)
* If there is no parameter value, that element will be false.
*
* @param array $m
*
* @throws MWException
* @return array
*/
public function parseMatch( $m ) {
reset( $m );
while ( list( $key, $value ) = each( $m ) ) {
if ( $key === 0 || $value === '' ) {
continue;
}
$parts = explode( '_', $key, 2 );
if ( count( $parts ) != 2 ) {
// This shouldn't happen
// continue;
throw new MWException( __METHOD__ . ': bad parameter name' );
}
list( /* $synIndex */, $magicName ) = $parts;
$paramValue = next( $m );
return [ $magicName, $paramValue ];
}
// This shouldn't happen either
throw new MWException( __METHOD__ . ': parameter not found' );
}
/**
* Match some text, with parameter capture
* Returns an array with the magic word name in the first element and the
* parameter in the second element.
* Both elements are false if there was no match.
*
* @param string $text
*
* @return array
*/
public function matchVariableStartToEnd( $text ) {
$regexes = $this->getVariableStartToEndRegex();
foreach ( $regexes as $regex ) {
if ( $regex !== '' ) {
$m = [];
if ( preg_match( $regex, $text, $m ) ) {
return $this->parseMatch( $m );
}
}
}
return [ false, false ];
}
/**
* Match some text, without parameter capture
* Returns the magic word name, or false if there was no capture
*
* @param string $text
*
* @return string|bool False on failure
*/
public function matchStartToEnd( $text ) {
$hash = $this->getHash();
if ( isset( $hash[1][$text] ) ) {
return $hash[1][$text];
}
global $wgContLang;
$lc = $wgContLang->lc( $text );
if ( isset( $hash[0][$lc] ) ) {
return $hash[0][$lc];
}
return false;
}
/**
* Returns an associative array, ID => param value, for all items that match
* Removes the matched items from the input string (passed by reference)
*
* @param string $text
*
* @return array
*/
public function matchAndRemove( &$text ) {
$found = [];
$regexes = $this->getRegex();
foreach ( $regexes as $regex ) {
if ( $regex === '' ) {
continue;
}
$matches = [];
$res = preg_match_all( $regex, $text, $matches, PREG_SET_ORDER );
if ( $res === false ) {
LoggerFactory::getInstance( 'parser' )->warning( 'preg_match_all returned false', [
'code' => preg_last_error(),
'regex' => $regex,
'text' => $text,
] );
} elseif ( $res ) {
foreach ( $matches as $m ) {
list( $name, $param ) = $this->parseMatch( $m );
$found[$name] = $param;
}
}
$res = preg_replace( $regex, '', $text );
if ( $res === null ) {
LoggerFactory::getInstance( 'parser' )->warning( 'preg_replace returned null', [
'code' => preg_last_error(),
'regex' => $regex,
'text' => $text,
] );
}
$text = $res;
}
return $found;
}
/**
* Return the ID of the magic word at the start of $text, and remove
* the prefix from $text.
* Return false if no match found and $text is not modified.
* Does not match parameters.
*
* @param string $text
*
* @return int|bool False on failure
*/
public function matchStartAndRemove( &$text ) {
$regexes = $this->getRegexStart();
foreach ( $regexes as $regex ) {
if ( $regex === '' ) {
continue;
}
if ( preg_match( $regex, $text, $m ) ) {
list( $id, ) = $this->parseMatch( $m );
if ( strlen( $m[0] ) >= strlen( $text ) ) {
$text = '';
} else {
$text = substr( $text, strlen( $m[0] ) );
}
return $id;
}
}
return false;
}
}