001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019package lucee.runtime.functions.string;
020
021import lucee.commons.lang.StringUtil;
022import lucee.runtime.PageContext;
023import lucee.runtime.exp.ExpressionException;
024import lucee.runtime.exp.PageException;
025import lucee.runtime.op.Caster;
026
027public class ParseNumber {
028        private static final int BIN=2;
029        private static final int OCT=8;
030        private static final int DEC=10;
031        private static final int HEX=16;
032        
033        public static double call(PageContext pc , String strNumber) throws PageException {
034                return call(pc,strNumber,null);
035        }
036
037        public static double call(PageContext pc , String strNumber,String strRadix) throws PageException {
038                return invoke(strNumber, strRadix);
039        }
040
041        public static double invoke(String strNumber,String strRadix, double defaultValue) {
042                try {
043                        return invoke(strNumber, strRadix);
044                } catch (PageException e) {
045                        return defaultValue;
046                }
047        }
048        public static double invoke(String strNumber,String strRadix) throws PageException {
049                strNumber=strNumber.trim();
050                int radix=DEC;
051                if(strRadix==null) {
052                        if(StringUtil.startsWithIgnoreCase(strNumber, "0x")){
053                                radix=HEX;
054                                strNumber=strNumber.substring(2);
055                        }
056                        else if(strNumber.startsWith("#")){
057                                radix=HEX;
058                                strNumber=strNumber.substring(1);
059                        }
060                        else if(strNumber.startsWith("0") && strNumber.length()>1){
061                                radix=OCT;
062                                strNumber=strNumber.substring(1);
063                        }
064                }
065                else {
066                        strRadix=strRadix.trim().toLowerCase();
067
068                        if(strRadix.startsWith("bin"))radix=BIN;
069                        else if(strRadix.startsWith("oct"))radix=OCT;
070                        else if(strRadix.startsWith("dec"))radix=DEC;
071                        else if(strRadix.startsWith("hex")){
072                                if(StringUtil.startsWithIgnoreCase(strNumber, "0x")) strNumber=strNumber.substring(2);
073                                else if(strNumber.startsWith("#")) strNumber=strNumber.substring(1);
074                                
075                                radix=HEX;
076                        }
077                        else throw new ExpressionException("invalid radix defintions, valid vales are [bin,oct,dec,hex]");
078                        
079                }
080                
081                if(radix==OCT && strNumber.indexOf('9')!=-1)
082                        throw new ExpressionException("digit [9] is out of range for a octal number");
083                
084                
085                if(strNumber.indexOf('.')!=-1 && radix!=DEC)
086                        throw new ExpressionException("the radix con only be [dec] for floating point numbers");
087                        
088                
089                if(radix==DEC) {
090                        return Caster.toDoubleValue(strNumber);
091                }
092                return Integer.parseInt(strNumber,radix);       
093        }
094        
095}