at.plechinger.scrapeql.parser.QueryParser.java Source code

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Here is the source code for at.plechinger.scrapeql.parser.QueryParser.java

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/*
 * The MIT License
 *
 * Copyright 2015 Lukas Plechinger.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package at.plechinger.scrapeql.parser;

import at.plechinger.scrapeql.lang.ScrapeQLLexer;
import at.plechinger.scrapeql.lang.ScrapeQLParser;
import at.plechinger.scrapeql.query.Query;
import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.tree.ParseTree;
import org.antlr.v4.runtime.tree.ParseTreeWalker;

/**
 *
 * @author lukas
 */
public class QueryParser {

    public Query parse(String query) {
        ScrapeQLLexer lexer = new ScrapeQLLexer(new ANTLRInputStream(query));

        ScrapeQLParser parser = new ScrapeQLParser(new CommonTokenStream(lexer));

        ParseTree tree = parser.parse();

        QueryParseTreeListener listener = new QueryParseTreeListener();

        ParseTreeWalker.DEFAULT.walk(listener, tree);

        Query resultQuery = listener.getQuery();

        return resultQuery;
    }
}