001 /**
002 * =========================================
003 * LibFormula : a free Java formula library
004 * =========================================
005 *
006 * Project Info: http://reporting.pentaho.org/libformula/
007 *
008 * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
009 *
010 * This library is free software; you can redistribute it and/or modify it under the terms
011 * of the GNU Lesser General Public License as published by the Free Software Foundation;
012 * either version 2.1 of the License, or (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016 * See the GNU Lesser General Public License for more details.
017 *
018 * You should have received a copy of the GNU Lesser General Public License along with this
019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020 * Boston, MA 02111-1307, USA.
021 *
022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
023 * in the United States and other countries.]
024 *
025 *
026 * ------------
027 * $Id: FormulaParser.java 3521 2007-10-16 10:55:14Z tmorgner $
028 * ------------
029 * (C) Copyright 2006-2007, by Pentaho Corporation.
030 */
031 package org.jfree.formula.parser;
032
033 import java.io.StringReader;
034
035 import org.jfree.formula.DefaultFormulaContext;
036 import org.jfree.formula.EvaluationException;
037 import org.jfree.formula.LibFormulaBoot;
038 import org.jfree.formula.lvalues.LValue;
039 import org.jfree.formula.operators.DefaultOperatorFactory;
040 import org.jfree.formula.operators.OperatorFactory;
041
042 public class FormulaParser extends GeneratedFormulaParser
043 {
044 // This is my parser class
045 private OperatorFactory operatorFactory;
046
047 public FormulaParser()
048 {
049 super(new StringReader(""));
050 operatorFactory = new DefaultOperatorFactory();
051 operatorFactory.initalize(LibFormulaBoot.getInstance().getGlobalConfig());
052 }
053
054 protected OperatorFactory getOperatorFactory()
055 {
056 return operatorFactory;
057 }
058
059 public LValue parse(final String formula) throws ParseException
060 {
061 if (formula == null)
062 {
063 throw new NullPointerException("Formula-text given must not be null.");
064 }
065 ReInit(new StringReader(formula));
066 return getExpression();
067 }
068
069 public static void main(final String[] args)
070 throws ParseException, EvaluationException
071 {
072 final FormulaParser parser = new FormulaParser();
073
074 // x = parser.parse("1 * 2 + 3 * 4");
075 // x.initialize(new DefaultFormulaContext());
076 // System.out.println(x);
077 //
078 // x = parser.parse("[a] * [b] + [c] * [d]");
079 // x.initialize(new DefaultFormulaContext());
080 // System.out.println(x);
081 //
082 // x = parser.parse("IF([A];[B];[C])");
083 // x.initialize(new DefaultFormulaContext());
084 // System.out.println(x);
085 //
086 // x = parser.parse("1 + ( 2+ (3 + (400 + 200)))");
087 // x.initialize(new DefaultFormulaContext());
088 // System.out.println(x);
089
090 final LValue x = parser.parse("(1)()");
091 x.initialize(new DefaultFormulaContext());
092 System.out.println(x);
093 }
094 }