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<?php
namespace SMW\Query\PrintRequest;
use InvalidArgumentException;
use SMW\DataValueFactory;
use SMW\DataValues\PropertyChainValue;
use SMW\Localizer;
use SMW\Query\PrintRequest;
use Title;
/**
* @license GNU GPL v2+
* @since 2.5
*
* @author Markus Krötzsch
* @author mwjames
*/
class Deserializer {
/**
* Create an PrintRequest object from a string description as one
* would normally use in #ask and related inputs. The string must start
* with a "?" and may contain label and formatting parameters after "="
* or "#", respectively. However, further parameters, given in #ask by
* "|+param=value" are not allowed here; they must be added
* individually.
*
* @since 2.5
*
* @param string $text
* @param boolean $showMode = false
*
* @return PrintRequest|null
*/
public static function deserialize( $text, $showMode = false ) {
list( $parts, $outputFormat, $printRequestLabel ) = self::getPartsFromText(
$text
);
$data = null;
if ( $printRequestLabel === '' ) { // print "this"
$printmode = PrintRequest::PRINT_THIS;
// default
$label = '';
// Distinguish the case of an empty format
if ( $outputFormat === '' ) {
$outputFormat = null;
}
} elseif ( self::isCategory( $printRequestLabel ) ) { // print categories
$printmode = PrintRequest::PRINT_CATS;
$label = $showMode ? '' : Localizer::getInstance()->getNamespaceTextById( NS_CATEGORY ); // default
} elseif ( PropertyChainValue::isChained( $printRequestLabel ) ) {
$data = DataValueFactory::getInstance()->newDataValueByType( PropertyChainValue::TYPE_ID );
$data->setUserValue( $printRequestLabel );
$printmode = PrintRequest::PRINT_CHAIN;
$label = $showMode ? '' : $data->getLastPropertyChainValue()->getWikiValue(); // default
} else { // print property or check category
$title = Title::newFromText( $printRequestLabel, SMW_NS_PROPERTY ); // trim needed for \n
// not a legal property/category name; give up
if ( $title === null ) {
return null;
}
if ( $title->getNamespace() == NS_CATEGORY ) {
$printmode = PrintRequest::PRINT_CCAT;
$data = $title;
$label = $showMode ? '' : $title->getText(); // default
} else { // enforce interpretation as property (even if it starts with something that looks like another namespace)
$printmode = PrintRequest::PRINT_PROP;
$data = DataValueFactory::getInstance()->newPropertyValueByLabel( $printRequestLabel );
if ( !$data->isValid() ) { // not a property; give up
return null;
}
$label = $showMode ? '' : $data->getWikiValue(); // default
}
}
// "plain printout"
// @docu mentions that `?foo#` is equal to `?foo#-` and avoid an
// empty string to distinguish it from "false"
if ( $outputFormat === '' ) {
$outputFormat = '-';
}
// label found, use this instead of default
if ( count( $parts ) > 1 ) {
$label = trim( $parts[1] );
}
if ( $printmode === PrintRequest::PRINT_THIS ) {
// Cover the case of `?#Test=#-`
if ( strrpos( $label, '#' ) !== false ) {
list( $label, $outputFormat ) = explode( '#', $label );
// `?#=foo#` is equal to `?#=foo#-`
if ( $outputFormat === '' ) {
$outputFormat = '-';
}
}
}
try {
$printRequest = new PrintRequest( $printmode, $label, $data, trim( $outputFormat ) );
$printRequest->markThisLabel( $text );
} catch ( InvalidArgumentException $e ) {
// something still went wrong; give up
$printRequest = null;
}
return $printRequest;
}
private static function isCategory( $text ) {
// Check for the canonical form (singular, plural)
if ( $text == 'Category' || $text == 'Categories' ) {
return true;
}
return Localizer::getInstance()->getNamespaceTextById( NS_CATEGORY ) == mb_convert_case( $text, MB_CASE_TITLE );
}
private static function getPartsFromText( $text ) {
// #1464
// Temporary encode "=" within a <> entity (<span>...</span>)
$text = preg_replace_callback( "/(<(.*?)>(.*?)>)/u", function( $matches ) {
foreach ( $matches as $match ) {
return str_replace( [ '=' ], [ '-3D' ], $match );
}
}, $text );
$parts = explode( '=', $text, 2 );
// Restore temporary encoding
$parts[0] = str_replace( [ '-3D' ], [ '=' ], $parts[0] );
if ( isset( $parts[1] ) ) {
$parts[1] = str_replace( [ '-3D' ], [ '=' ], $parts[1] );
}
$propparts = explode( '#', $parts[0], 2 );
$printRequestLabel = trim( $propparts[0] );
$outputFormat = isset( $propparts[1] ) ? trim( $propparts[1] ) : false;
return [ $parts, $outputFormat, $printRequestLabel ];
}
}
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