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<?php
namespace SMW\SPARQLStore\QueryEngine\DescriptionInterpreters;
use SMW\DIWikiPage;
use SMW\Query\Language\Description;
use SMW\Query\Language\ValueDescription;
use SMW\SPARQLStore\QueryEngine\Condition\FalseCondition;
use SMW\SPARQLStore\QueryEngine\Condition\FilterCondition;
use SMW\SPARQLStore\QueryEngine\Condition\SingletonCondition;
use SMW\SPARQLStore\QueryEngine\ConditionBuilder;
use SMW\SPARQLStore\QueryEngine\DescriptionInterpreter;
use SMWDIBlob as DIBlob;
use SMWDIUri as DIUri;
use SMWExpElement as ExpElement;
use SMWExpNsResource as ExpNsResource;
use SMWExporter as Exporter;
use SMWTurtleSerializer as TurtleSerializer;
/**
* @license GNU GPL v2+
* @since 2.1
*
* @author Markus Krötzsch
* @author mwjames
*/
class ValueDescriptionInterpreter implements DescriptionInterpreter {
/**
* @var ConditionBuilder
*/
private $conditionBuilder;
/**
* @var Exporter
*/
private $exporter;
/**
* @since 2.1
*
* @param ConditionBuilder|null $conditionBuilder
*/
public function __construct( ConditionBuilder $conditionBuilder = null ) {
$this->conditionBuilder = $conditionBuilder;
$this->exporter = Exporter::getInstance();
}
/**
* @since 2.2
*
* {@inheritDoc}
*/
public function canInterpretDescription( Description $description ) {
return $description instanceof ValueDescription;
}
/**
* @since 2.2
*
* {@inheritDoc}
*/
public function interpretDescription( Description $description ) {
$joinVariable = $this->conditionBuilder->getJoinVariable();
$orderByProperty = $this->conditionBuilder->getOrderByProperty();
$asNoCase = $this->conditionBuilder->isSetFlag( SMW_SPARQL_QF_NOCASE );
$dataItem = $description->getDataItem();
$property = $description->getProperty();
switch ( $description->getComparator() ) {
case SMW_CMP_EQ: $comparator = '=';
break;
case SMW_CMP_LESS: $comparator = '<';
break;
case SMW_CMP_GRTR: $comparator = '>';
break;
case SMW_CMP_LEQ: $comparator = '<=';
break;
case SMW_CMP_GEQ: $comparator = '>=';
break;
case SMW_CMP_NEQ: $comparator = '!=';
break;
case SMW_CMP_PRIM_LIKE;
case SMW_CMP_LIKE: $comparator = 'regex';
break;
case SMW_CMP_PRIM_NLKE;
case SMW_CMP_NLKE: $comparator = '!regex';
break;
default: $comparator = ''; // unkown, unsupported
}
if ( $comparator === '' ) {
return $this->createConditionForEmptyComparator( $joinVariable, $orderByProperty );
} elseif ( $comparator == '=' && $asNoCase === false ) {
return $this->createConditionForEqualityComparator( $dataItem, $property, $joinVariable, $orderByProperty );
} elseif ( $comparator == 'regex' || $comparator == '!regex' ) {
return $this->createConditionForRegexComparator( $dataItem, $joinVariable, $orderByProperty, $comparator );
}
return $this->createFilterConditionForAnyOtherComparator(
$dataItem,
$joinVariable,
$orderByProperty,
$comparator
);
}
private function createConditionForEmptyComparator( $joinVariable, $orderByProperty ) {
return $this->conditionBuilder->newTrueCondition( $joinVariable, $orderByProperty );
}
private function createConditionForEqualityComparator( $dataItem, $property, $joinVariable, $orderByProperty ) {
$expElement = $this->exporter->getDataItemHelperExpElement( $dataItem );
if ( $expElement === null ) {
$expElement = $this->exporter->getDataItemExpElement( $dataItem );
}
if ( $expElement === null || !$expElement instanceof ExpElement ) {
return new FalseCondition();
}
$condition = new SingletonCondition( $expElement );
$redirectByVariable = $this->conditionBuilder->tryToFindRedirectVariableForDataItem(
$dataItem
);
// If it is a standalone value (e.g [[:Foo]] with no property) construct a
// filter condition otherwise just assign the variable and the succeeding
// process the ensure the replacement
if ( $redirectByVariable !== null && $property === null ) {
$condition = $this->createFilterConditionForAnyOtherComparator(
$dataItem,
$joinVariable,
$orderByProperty,
'='
);
$condition->filter = "?$joinVariable = $redirectByVariable";
} elseif ( $redirectByVariable !== null ) {
$condition->matchElement = $redirectByVariable;
}
$this->conditionBuilder->addOrderByDataForProperty(
$condition,
$joinVariable,
$orderByProperty,
$dataItem->getDIType()
);
return $condition;
}
private function createConditionForRegexComparator( $dataItem, $joinVariable, $orderByProperty, $comparator ) {
if ( !$dataItem instanceof DIBlob && !$dataItem instanceof DIWikiPage && !$dataItem instanceof DIUri ) {
return $this->conditionBuilder->newTrueCondition( $joinVariable, $orderByProperty );
}
if ( $dataItem instanceof DIBlob ) {
$search = $dataItem->getString();
} else {
$search = $dataItem->getSortKey();
}
// @codingStandardsIgnoreStart phpcs, ignore --sniffs=Generic.Files.LineLength
$pattern = '^' . str_replace(
[ 'https://', 'http://', '%2A', '.', '+', '{', '}', '(', ')', '|', '^', '$', '[', ']', '*', '?', "'", '\\\.', '\\', '"', '\\\\\\\"' ],
[ '*', '*', '*', '\.', '\+', '\{', '\}', '\(', '\)', '\|', '\^', '\$', '\[', '\]', '.*', '.' , "\'", '\\\\\.', '\\\\', '\\\\\"', '\\\\\\\\\\\"' ],
$search
) . '$';
// @codingStandardsIgnoreEnd
$condition = $this->createFilterConditionToMatchRegexPattern(
$dataItem,
$joinVariable,
$comparator,
$pattern
);
$redirectByVariable = $this->conditionBuilder->tryToFindRedirectVariableForDataItem(
$dataItem
);
if ( $redirectByVariable !== null ) {
$condition->matchElement = $redirectByVariable;
}
$this->conditionBuilder->addOrderByDataForProperty(
$condition,
$joinVariable,
$orderByProperty,
$dataItem->getDIType()
);
return $condition;
}
private function createFilterConditionForAnyOtherComparator( $dataItem, $joinVariable, $orderByProperty, $comparator ) {
$result = new FilterCondition( '', [] );
$this->conditionBuilder->addOrderByData(
$result,
$joinVariable,
$dataItem->getDIType()
);
$orderByVariable = '?' . $result->orderByVariable;
if ( $dataItem instanceof DIWikiPage ) {
$expElement = $this->exporter->getDataItemExpElement( new DIBlob( $dataItem->getSortKey() ) );
} else {
$expElement = $this->exporter->getDataItemHelperExpElement( $dataItem );
if ( is_null( $expElement ) ) {
$expElement = $this->exporter->getDataItemExpElement( $dataItem );
}
}
$valueName = TurtleSerializer::getTurtleNameForExpElement( $expElement );
if ( $expElement instanceof ExpNsResource ) {
$result->namespaces[$expElement->getNamespaceId()] = $expElement->getNamespace();
$dataItem = $expElement->getDataItem();
}
$this->lcase( $dataItem, $orderByVariable, $valueName );
$result->filter = "$orderByVariable $comparator $valueName";
return $result;
}
private function createFilterConditionToMatchRegexPattern( $dataItem, &$joinVariable, $comparator, $pattern ) {
$flag = $this->conditionBuilder->isSetFlag( SMW_SPARQL_QF_NOCASE ) ? 'i' : 's';
if ( $dataItem instanceof DIBlob ) {
return new FilterCondition( "$comparator( ?$joinVariable, \"$pattern\", \"$flag\")", [] );
}
if ( $dataItem instanceof DIUri ) {
return new FilterCondition( "$comparator( str( ?$joinVariable ), \"$pattern\", \"i\")", [] );
}
// Pattern search for a wikipage object can only be done on the sortkey
// literal and not on it's resource
$skeyExpElement = Exporter::getInstance()->getSpecialPropertyResource( '_SKEY' );
$expElement = $this->exporter->getDataItemExpElement( $dataItem->getSortKeyDataItem() );
$condition = new SingletonCondition( $expElement );
$filterVariable = $this->conditionBuilder->getNextVariable();
$condition->condition = "?$joinVariable " . $skeyExpElement->getQName(). " ?$filterVariable .\n";
$condition->matchElement = "?$joinVariable";
$filterCondition = new FilterCondition( "$comparator( ?$filterVariable, \"$pattern\", \"$flag\")", [] );
$condition->weakConditions = [ $filterVariable => $filterCondition->getCondition() ];
return $condition;
}
private function lcase( $dataItem, &$orderByVariable, &$valueName ) {
$isValidDataItem = $dataItem instanceof DIBlob || $dataItem instanceof DIUri || $dataItem instanceof DIWikiPage;
// https://stackoverflow.com/questions/10660030/how-to-write-sparql-query-that-efficiently-matches-string-literals-while-ignorin
if ( $this->conditionBuilder->isSetFlag( SMW_SPARQL_QF_NOCASE ) && $isValidDataItem ) {
$orderByVariable = "lcase(str($orderByVariable) )";
$valueName = mb_strtolower( $valueName );
}
}
}
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