1 files changed, 122 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/ParserFunctions/DeclareParserFunction.php b/www/wiki/extensions/SemanticMediaWiki/src/ParserFunctions/DeclareParserFunction.php
new file mode 100644
index 00000000..e0dc8cb2
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/ParserFunctions/DeclareParserFunction.php
@@ -0,0 +1,122 @@
+<?php
+
+namespace SMW\ParserFunctions;
+
+use Parser;
+use PPFrame;
+use SMW\DataValueFactory;
+use SMW\ParserData;
+use SMWPropertyValue as PropertyValue;
+
+/**
+ * Class that provides the {{#declare}} parser function
+ *
+ * @see http://semantic-mediawiki.org/wiki/Help:Argument_declaration_in_templates
+ *
+ * @license GNU GPL v2+
+ * @since   1.5.3
+ *
+ * @author Markus Krötzsch
+ * @author Jeroen De Dauw
+ */
+class DeclareParserFunction {
+
+	/**
+	 * @var ParserData
+	 */
+	private $parserData;
+
+	/**
+	 * @var DIWikiPage
+	 */
+	private $subject;
+
+	/**
+	 * @since 2.1
+	 *
+	 * @param ParserData $parserData
+	 */
+	public function __construct( ParserData $parserData ) {
+		$this->parserData = $parserData;
+	}
+
+	/**
+	 * @since 2.1
+	 *
+	 * @param PPFrame $frame
+	 * @param array $args
+	 */
+	public function parse( PPFrame $frame, array $args ) {
+
+		// @todo Save as metadata
+		if ( !$frame->isTemplate() ) {
+			return '';
+		}
+
+		$this->subject = $this->parserData->getSemanticData()->getSubject();
+
+		foreach ( $args as $arg ) {
+			if ( trim( $arg ) !== '' ) {
+				$expanded = trim( $frame->expand( $arg ) );
+				$parts = explode( '=', $expanded, 2 );
+
+				if ( count( $parts ) == 1 ) {
+					$propertystring = $expanded;
+					$argumentname = $expanded;
+				} else {
+					$propertystring = $parts[0];
+					$argumentname = $parts[1];
+				}
+
+				$propertyValue = DataValueFactory::getInstance()->newPropertyValueByLabel( $propertystring );
+				$argument = $frame->getArgument( $argumentname );
+				$valuestring = $frame->expand( $argument );
+
+				if ( $propertyValue->isValid() ) {
+					$this->matchValueArgument( $propertyValue, $propertystring, $valuestring );
+				}
+			}
+		}
+
+		$this->parserData->pushSemanticDataToParserOutput();
+
+		return '';
+	}
+
+	private function matchValueArgument( PropertyValue $propertyValue, $propertystring, $valuestring ) {
+
+		if ( $propertyValue->getPropertyTypeID() === '_wpg' ) {
+			$matches = [];
+			preg_match_all( '/\[\[([^\[\]]*)\]\]/u', $valuestring, $matches );
+			$objects = $matches[1];
+
+			if ( count( $objects ) == 0 ) {
+				if ( trim( $valuestring ) !== '' ) {
+					$this->addDataValue( $propertystring, $valuestring );
+				}
+			} else {
+				foreach ( $objects as $object ) {
+					$this->addDataValue( $propertystring, $object );
+				}
+			}
+		} elseif ( trim( $valuestring ) !== '' ) {
+			$this->addDataValue( $propertystring, $valuestring );
+		}
+
+		// $value = \SMW\DataValueFactory::getInstance()->newDataValueByProperty( $property->getDataItem(), $valuestring );
+		// if (!$value->isValid()) continue;
+	}
+
+	private function addDataValue( $property, $value ) {
+
+		$dataValue = DataValueFactory::getInstance()->newDataValueByText(
+			$property,
+			$value,
+			false,
+			$this->subject
+		);
+
+		$this->parserData->addDataValue( $dataValue );
+	}
+
+}