com.obdobion.algebrain.token.TokNumber Maven / Gradle / Ivy

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package com.obdobion.algebrain.token;

import com.obdobion.algebrain.Equ;
import com.obdobion.algebrain.EquPart;
import com.obdobion.algebrain.ValueStack;

/**
 * @author Chris DeGreef
 *
 */
public class TokNumber extends TokOperand
{
    public TokNumber()
    {
        super();
    }

    @Override
    public boolean accepts (final char s)
    {
        return Character.isDigit(s) || s == '.';
    }

    @Override
    public EquPart morph () throws Exception
    {
        if (getValue().length() == 1 && getValue().charAt(0) == '-')
        {
            final EquPart part = Equ.getInstance().operator(this);
            if (part != null)
                return part;
        }
        return this;
    }

    @Override
    public void resolve (final ValueStack values) throws Exception
    {
        values.push(new Double(getValue().toString()));
    }

    @Override
    public String toString ()
    {
        return "num(" + super.toString() + ")";
    }
}