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package wcps.server.cli;
import grammar.*;
import grammar.wcpsParser.*;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.antlr.runtime.ANTLRInputStream;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.RecognitionException;
/** Test the WCPS grammar parser (generated by ANTLR).
* Input a Abstract Syntax query.
* Outputs the corresponding XML tree.
*
* @author Andrei Aiordachioaie
*/
public class grammar {
static String query;
public static void main(String[] args) throws RecognitionException, IOException
{
if (args.length != 1)
{
System.err.println("AbstractGrammarGen: no query as parameter !");
query = "for a in (rgb) return " +
"condense + over $x x(1:10), $y y(25:75) " +
"using $x * (a[x($x), y($y)]).red";
}
else
query = args[0];
System.out.println("Running with the following query: " + query);
String xmlString = convertAbstractQueryToXml(query);
System.out.println("Output XML: \n****************\n" + xmlString);
System.exit(0);
}
/** Converts a WCPS abstract syntax query to an XML query
*
* @param query Abstract Syntax query
* @return String XML query
* @throws java.io.IOException
* @throws org.antlr.runtime.RecognitionException
*/
public static String convertAbstractQueryToXml(String query) throws IOException, RecognitionException
{
InputStream stream = new ByteArrayInputStream(query.getBytes()); // defaults to ISO-1
ANTLRInputStream inputStream = new ANTLRInputStream(stream);
// wcpsLexer lexer = new wcpsLexer( inputStream );
wcpsLexer lexer = new wcpsLexer( inputStream );
CommonTokenStream tokenStream = new CommonTokenStream(lexer);
// wcpsParser parser = new wcpsParser(tokenStream);
wcpsParser parser = new wcpsParser(tokenStream);
wcpsRequest_return rrequest = parser.wcpsRequest();
WCPSRequest request = rrequest.value;
String result = request.toXML();
return result;
}
}
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