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<?php
namespace SMW\Query\Parser;
/**
* @license GNU GPL v2+
* @since 3.0
*
* @author Markus Krötzsch
*/
class Tokenizer {
/**
* @var string
*/
private $defaultPattern = '';
/**
* @since 3.0
*
* @param array $prefixes
*/
public function setDefaultPattern( array $prefixes ) {
$pattern = '';
foreach ( $prefixes as $pref ) {
$pattern .= '|^' . $pref;
}
$this->defaultPattern = '\[\[|\]\]|::|:=|<q>|<\/q>' . $pattern . '|\|\||\|';
}
/**
* Get the next unstructured string chunk from the query string.
* Chunks are delimited by any of the special strings used in inline queries
* (such as [[, ]], <q>, ...). If the string starts with such a delimiter,
* this delimiter is returned. Otherwise the first string in front of such a
* delimiter is returned.
* Trailing and initial spaces are ignored if $trim is true, and chunks
* consisting only of spaces are not returned.
* If there is no more qurey string left to process, the empty string is
* returned (and in no other case).
*
* The stoppattern can be used to customise the matching, especially in order to
* overread certain special symbols.
*
* $consume specifies whether the returned chunk should be removed from the
* query string.
*
* @param string $currentString
* @param string $stoppattern
* @param boolean $consume
* @param boolean $trim
*
* @return string
*/
public function getToken( &$currentString, $stoppattern = '', $consume = true, $trim = true ) {
if ( $stoppattern === '' ) {
$stoppattern = $this->defaultPattern;
}
$chunks = preg_split( '/[\s]*(' . $stoppattern . ')/iu', $currentString, 2, PREG_SPLIT_DELIM_CAPTURE );
if ( count( $chunks ) == 1 ) { // no matches anymore, strip spaces and finish
if ( $consume ) {
$currentString = '';
}
return $trim ? trim( $chunks[0] ) : $chunks[0];
} elseif ( count( $chunks ) == 3 ) { // this should generally happen if count is not 1
if ( $chunks[0] === '' ) { // string started with delimiter
if ( $consume ) {
$currentString = $chunks[2];
}
return $trim ? trim( $chunks[1] ) : $chunks[1];
} else {
if ( $consume ) {
$currentString = $chunks[1] . $chunks[2];
}
return $trim ? trim( $chunks[0] ) : $chunks[0];
}
}
// should never happen
return false;
}
}
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