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/*
 * Copyright (c) 2013, SRI International
 * All rights reserved.
 * Licensed under the The BSD 3-Clause License;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 * 
 * http://opensource.org/licenses/BSD-3-Clause
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the aic-expresso nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.sri.ai.expresso.api;

import com.google.common.annotations.Beta;

/**
 * A parser maps strings to the corresponding {@link Expression}s. To give
 * implementations a chance to free up resources and save caches, the interface
 * requires the method {@link #close()} to be called before finishing the
 * application.
 * 
 * @author braz
 */
@Beta
public interface Parser {
	interface ErrorListener {
		void parseError(Object offendingSymbol, int line, int charPositionInLine, String msg, Exception e);
	}
	
	default Expression parse(String string) {
		return parse(string, newDefaultErrorListener());
	}
	
	Expression parse(String string, ErrorListener errorListener);
	
	void close();
	
	default ErrorListener newDefaultErrorListener() {
		return (offendingSymbol, line, charPositionInLine, msg, e) -> {
			System.err.println("Parser Error: line " + line + ":" + charPositionInLine + " " + msg);
		};
	}
}