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The cql library for the Clinical Quality Language Java reference implementation

There is a newer version: 3.18.0

package org.cqframework.cql;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.tree.ParseTree;
import org.cqframework.cql.gen.cqlLexer;
import org.cqframework.cql.gen.cqlParser;

public class Main {
    public static void main(String[] args) throws IOException {
        String inputFile = null;
        if (args.length > 0) {
            inputFile = args[0];
        }
        InputStream is = System.in;
        if (inputFile != null) {
            is = new FileInputStream(inputFile);
        }
        CharStream input = CharStreams.fromStream(is);
        cqlLexer lexer = new cqlLexer(input);
        CommonTokenStream tokens = new CommonTokenStream(lexer);
        cqlParser parser = new cqlParser(tokens);
        parser.setBuildParseTree(true);
        ParseTree tree = parser.library();

        // show tree in text form
        System.out.println(tree.toStringTree(parser));
    }
}