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.transformer.bytecode.op;
020
021import lucee.runtime.exp.TemplateException;
022import lucee.transformer.bytecode.BytecodeContext;
023import lucee.transformer.bytecode.BytecodeException;
024import lucee.transformer.bytecode.Literal;
025import lucee.transformer.bytecode.Position;
026import lucee.transformer.bytecode.cast.CastDouble;
027import lucee.transformer.bytecode.expression.ExprDouble;
028import lucee.transformer.bytecode.expression.Expression;
029import lucee.transformer.bytecode.expression.ExpressionBase;
030import lucee.transformer.bytecode.literal.LitDouble;
031import lucee.transformer.bytecode.util.Methods;
032import lucee.transformer.bytecode.util.Types;
033
034import org.objectweb.asm.Opcodes;
035import org.objectweb.asm.Type;
036import org.objectweb.asm.commons.GeneratorAdapter;
037
038public final class OpNegateNumber extends ExpressionBase implements ExprDouble {
039
040        private ExprDouble expr;
041        
042
043        public static final int PLUS = 0;
044        public static final int MINUS = 1;
045
046        private OpNegateNumber(Expression expr, Position start, Position end) {
047        super(start,end);
048        this.expr=CastDouble.toExprDouble(expr);
049    }
050    
051    /**
052     * Create a String expression from a Expression
053     * @param left 
054     * @param right 
055     * 
056     * @return String expression
057     * @throws TemplateException 
058     */
059    public static ExprDouble toExprDouble(Expression expr, Position start, Position end) {
060        if(expr instanceof Literal) {
061                Double d=((Literal) expr).getDouble(null);
062                if(d!=null) {
063                        return LitDouble.toExprDouble(-d.doubleValue(),start,end);
064                }
065        }
066        return new OpNegateNumber(expr,start,end);
067    }
068    
069    public static ExprDouble toExprDouble(Expression expr, int operation, Position start, Position end) {
070        if(operation==MINUS) return toExprDouble(expr, start,end);
071        return CastDouble.toExprDouble(expr);
072    }
073        
074        
075        /**
076         *
077         * @see lucee.transformer.bytecode.expression.ExpressionBase#_writeOut(org.objectweb.asm.commons.GeneratorAdapter, int)
078         */
079        public Type _writeOut(BytecodeContext bc, int mode) throws BytecodeException {
080                GeneratorAdapter adapter = bc.getAdapter();
081        if(mode==MODE_REF) {
082            _writeOut(bc,MODE_VALUE);
083            adapter.invokeStatic(Types.CASTER,Methods.METHOD_TO_DOUBLE_FROM_DOUBLE);
084            return Types.DOUBLE;
085        }
086        
087        expr.writeOut(bc, MODE_VALUE);
088        adapter.visitInsn(Opcodes.DNEG);
089        
090
091        return Types.DOUBLE_VALUE;
092        }
093}