fr.inria.oak.paxquery.xparser.XPathMain.java Source code

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Here is the source code for fr.inria.oak.paxquery.xparser.XPathMain.java

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/*******************************************************************************
 * Copyright (C) 2013, 2014, 2015 by Inria and Paris-Sud University
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package fr.inria.oak.paxquery.xparser;

import org.antlr.v4.runtime.*;
import org.antlr.v4.runtime.tree.*;

public class XPathMain {
    public static void main(String args[]) {
        try {
            System.out.println("Enter a valid XPath expression followed by Enter and Ctrl+D: ");
            //create a CharStream that reads from standard input
            ANTLRInputStream input = new ANTLRInputStream(System.in);
            //create a lexer that feeds off of input CharStream
            XPathLexer lexer = new XPathLexer(input);
            //create a buffer of tokens pulled from the lexer
            CommonTokenStream tokens = new CommonTokenStream(lexer);
            //create a parser that feeds off the tokens buffer
            XPathParser parser = new XPathParser(tokens);

            ParseTree tree = parser.xpath(); //begin parsing at start rule
            System.out.println(tree.toStringTree(parser));
        } catch (Exception e) {
            System.out.println("Query is malformed or not yet supported.");
        }

    }

    public static boolean test_main(String test_query) {
        try {
            System.out.println("Query: " + test_query);
            //create a CharStream that reads from standard input
            ANTLRInputStream input = new ANTLRInputStream(new java.io.ByteArrayInputStream(test_query.getBytes()));
            //create a lexer that feeds off of input CharStream
            XPathLexer lexer = new XPathLexer(input);
            //create a buffer of tokens pulled from the lexer
            CommonTokenStream tokens = new CommonTokenStream(lexer);
            //create a parser that feeds off the tokens buffer
            XPathParser parser = new XPathParser(tokens);

            ParseTree tree = parser.xpath(); //begin parsing at start rule
            System.out.println(tree.toStringTree(parser));

            return true;
        } catch (Exception e) {
            System.out.println("Error in input " + test_query);
            System.out.println(e.getMessage());
            return false;
        }
    }

}