GroovyASTSourceCompiler.java

/*
 * Copyright (c) 2013 Data Harmonisation Panel
 * 
 * All rights reserved. This program and the accompanying materials are made
 * available under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */

package eu.esdihumboldt.hale.ui.util.groovy.ast;

import java.util.ArrayList;
import java.util.List;

import org.codehaus.groovy.ast.ASTNode;
import org.codehaus.groovy.ast.builder.AstBuilder;
import org.codehaus.groovy.control.CompilePhase;

import eu.esdihumboldt.hale.ui.util.source.SourceCompiler;

/**
 * Groovy AST source compiler using the {@link AstBuilder}.
 * 
 * @author Simon Templer
 */
public class GroovyASTSourceCompiler implements SourceCompiler<GroovyAST> {

	private final AstBuilder builder = new AstBuilder();

	@Override
	public GroovyAST compile(String content) {
		try {
			List<ASTNode> nodes = builder.buildFromString(CompilePhase.CANONICALIZATION, false,
					content);
			// first entry is the BlockStatement, which is contained in
			// script.run(), too!
			nodes = new ArrayList<>(nodes.subList(1, nodes.size()));
			return new GroovyAST(nodes);
		} catch (Exception e) {
			return null;
		}
	}

}