/*
* Copyright (C) 2000 - 2010 TagServlet Ltd
*
* This file is part of Open BlueDragon (OpenBD) CFML Server Engine.
*
* OpenBD is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* Free Software Foundation,version 3.
*
* OpenBD is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with OpenBD. If not, see http://www.gnu.org/licenses/
*
* Additional permission under GNU GPL version 3 section 7
*
* If you modify this Program, or any covered work, by linking or combining
* it with any of the JARS listed in the README.txt (or a modified version of
* (that library), containing parts covered by the terms of that JAR, the
* licensors of this Program grant you additional permission to convey the
* resulting work.
* README.txt @ http://www.openbluedragon.org/license/README.txt
*
* http://www.openbluedragon.org/
*/
package com.naryx.tagfusion.cfm.parser;
/**
* Definition of expression tree for a unary expression.
*/
import com.naryx.tagfusion.cfm.engine.cfBooleanData;
import com.naryx.tagfusion.cfm.engine.cfData;
import com.naryx.tagfusion.cfm.engine.cfNumberData;
import com.naryx.tagfusion.cfm.engine.cfmRunTimeException;
public class CFUnaryExpression extends CFExpression implements
java.io.Serializable {
private static final long serialVersionUID = 1L;
private int kind;
private CFExpression sub;
public CFUnaryExpression( org.antlr.runtime.Token _t, CFExpression _sub ) {
super(_t);
kind = _t.getType();
sub = _sub;
}
public byte getType() {
return CFExpression.UNARY;
}
public cfData Eval( CFContext context ) throws cfmRunTimeException {
cfData subVal;
cfData val = null;
cfLData ldata = null;
setLineCol(context);
subVal = sub.Eval(context);
if ( subVal.getDataType() == cfData.CFLDATA ) {
ldata = (cfLData) subVal;
subVal = ((cfLData) subVal).Get(context);
}
setLineCol(context);
switch (kind) {
case CFMLLexer.MINUS:
// if subVal is a numeric then we know it's safe to apply the MINUS
if ( subVal.getDataType() == cfData.CFNUMBERDATA ) {
if ( ((cfNumberData) subVal).isInt() ) {
val = new cfNumberData(subVal.getInt() * -1);
} else {
val = new cfNumberData(subVal.getDouble() * -1.0);
}
// else just try creating the number
} else {
try {
val = cfData.createNumber_Validate("-" + subVal.getString(), false);
} catch (Exception e) {
throw new CFException(
"Invalid expression. The '-' operator cannot be applied to a value of this type.",
context);
}
}
break;
case CFMLLexer.NOT:
case CFMLLexer.NOTOP:
try {
val = cfBooleanData.getcfBooleanData(!subVal.getBoolean());
} catch (Exception e) {
throw new CFException(
"Invalid expression. The NOT operator cannot be applied to a value of this type.",
context);
}
break;
case CFMLLexer.PLUS:
val = sub.Eval(context);
break;
case CFMLLexer.PLUSPLUS:
val = update(context, subVal, ldata, 1, false);
break;
case CFMLLexer.MINUSMINUS:
val = update(context, subVal, ldata, -1, false);
break;
case CFMLLexer.POSTPLUSPLUS:
val = update(context, subVal, ldata, 1, true);
break;
case CFMLLexer.POSTMINUSMINUS:
val = update(context, subVal, ldata, -1, true);
break;
default:
throw new CFException("Unknown unary operator (" + String.valueOf(kind)
+ ").", context);
}
return context._lastExpr = val;
}
private cfData update( CFContext _context, cfData _currentVal,
cfLData _sourceLData, int _additive, boolean _post )
throws cfmRunTimeException {
cfNumberData numVal = _currentVal.getNumber();
cfData returnVal;
cfNumberData newValue;
if ( numVal.isInt() ) {
newValue = new cfNumberData(numVal.getInt() + _additive);
} else {
newValue = new cfNumberData(numVal.getDouble() + (double) _additive);
}
if ( _post ) {
returnVal = numVal;
if ( _sourceLData != null ) {
_sourceLData.Set(newValue, _context);
}
} else {
returnVal = newValue;
if ( _sourceLData != null ) {
_sourceLData.Set(newValue, _context);
}
}
return returnVal;
}
public String Decompile( int indent ) {
StringBuilder sb = new StringBuilder();
switch( kind ){
case CFMLLexer.MINUS:
sb.append( '-' );
sb.append( sub.Decompile( 0 ) );
break;
case CFMLLexer.NOT:
sb.append( "NOT " );
sb.append( sub.Decompile( 0 ) );
break;
case CFMLLexer.NOTOP:
sb.append( '!' );
sb.append( sub.Decompile( 0 ) );
break;
case CFMLLexer.PLUS:
sb.append( '+' );
sb.append( sub.Decompile( 0 ) );
break;
case CFMLLexer.PLUSPLUS:
sb.append( "++" );
sb.append( sub.Decompile( 0 ) );
break;
case CFMLLexer.MINUSMINUS:
sb.append( "--" );
sb.append( sub.Decompile( 0 ) );
break;
case CFMLLexer.POSTPLUSPLUS:
sb.append( sub.Decompile( 0 ) );
sb.append( "--" );
break;
case CFMLLexer.POSTMINUSMINUS:
sb.append( sub.Decompile( 0 ) );
sb.append( "--" );
break;
}
return sb.toString();
}
}