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/*****************************************************************************
JEP - Java Expression Parser
JEP is a Java package for parsing and evaluating mathematical
expressions. It currently supports user defined variables,
constant, and functions. A number of common mathematical
functions and constants are included.
JEPLite is a simplified version of JEP.
JEP Author: Nathan Funk
JEPLite Author: Stephen "Cheffo" Kolaroff
JEP Copyright (C) 2001 Nathan Funk
JEPLite Copyright (C) 2002 Stefan Kolarov
JEPLite is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
JEPLite 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 JEPLite; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
package org.cheffo.jeplite;
import org.cheffo.jeplite.function.*;
import org.cheffo.jeplite.util.*;
import java.util.*;
public class ASTFunNode extends SimpleNode {
private PostfixMathCommand pfmc;
public ASTFunNode(int id) {
super(id);
}
public ASTFunNode(Parser p, int id) {
super(p, id);
}
public Object jjtAccept(ParserVisitor visitor, Object data) {
return visitor.visit(this, data);
}
public void setFunction(String name_in, PostfixMathCommand pfmc_in)
{
name = name_in;
pfmc = pfmc_in;
}
public String toString()
{
if (name!=null)
{
try {
return "Function \"" + name + "\" = " + getValue();
} catch (Exception e) {
return "Function \"" + name + "\"";
}
}
else
{
return "Function: no function class set";
}
}
public double getValue() throws ParseException
{
double value = 0;
DoubleStack tempStack = new DoubleStack();
getValue(tempStack);
return tempStack.pop();
}
public final void getValue(DoubleStack tempStack) throws ParseException {
double value = 0;
for (int i=0; i < jjtGetNumChildren(); i++)
{
children[i].getValue(tempStack);
}
if (pfmc!=null)
{
try {
pfmc.run(tempStack);
} catch (ParseException e)
{
String errorStr = "Error in \"" + name + "\" function: ";
errorStr += e.getErrorInfo();
throw new ParseException(errorStr);
}
}
}
}
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