package org.nfunk.jep.function;

import java.util.Stack;
import org.nfunk.jep.ParseException;
import org.nfunk.jep.type.Complex;

public class ArcTanH extends PostfixMathCommand {
  public void run(Stack paramStack) throws ParseException {
    checkStack(paramStack);
    Object object = paramStack.pop();
    paramStack.push(atanh(object));
  }
  
  public Object atanh(Object paramObject) throws ParseException {
    if (paramObject instanceof Complex)
      return ((Complex)paramObject).atanh(); 
    if (paramObject instanceof Number) {
      double d = ((Number)paramObject).doubleValue();
      if (d > -1.0D && d < 1.0D) {
        double d1 = Math.log((1.0D + d) / (1.0D - d)) / 2.0D;
        return new Double(d1);
      } 
      Complex complex = new Complex(d, 0.0D);
      return complex.atanh();
    } 
    throw new ParseException("Invalid parameter type");
  }
}