/*
    Copyright (C) 2022 Nicola L.C. Talbot
    www.dickimaw-books.com

    This program 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 3 of the License, or
    (at your option) any later version.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
package com.dickimawbooks.texparserlib.primitives;

import java.io.IOException;
import java.io.EOFException;

import com.dickimawbooks.texparserlib.*;

public class ParIndent extends Primitive implements InternalQuantity
{
   public ParIndent()
   {
      this("parindent");
   }

   public ParIndent(String name)
   {
      super(name);
   }

   @Override
   public Object clone()
   {
      return new ParIndent(getName());
   }

   @Override
   public TeXObject getQuantity(TeXParser parser, TeXObjectList stack)
    throws IOException
   {
      TeXDimension dim = parser.getSettings().getCurrentParIndent();

      if (dim == null)
      {
         return new UserDimension();
      }
      else
      {
         return dim;
      }
   }

   @Override
   public void setQuantity(TeXParser parser, TeXObject quantity)
    throws TeXSyntaxException
   {
      if (!(quantity instanceof TeXDimension))
      {
         throw new TeXSyntaxException(parser, 
           TeXSyntaxException.ERROR_DIMEN_EXPECTED);
      }

      parser.getSettings().setParIndent((TeXDimension)quantity);
   }

   @Override
   public void process(TeXParser parser, TeXObjectList stack)
      throws IOException
   {
      popModifier(parser, stack, '=');
      TeXDimension dim = stack.popDimension(parser);
      parser.getSettings().setParIndent(dim);
   }

   @Override
   public void process(TeXParser parser)
      throws IOException
   {
      popModifier(parser, parser, '=');
      TeXDimension dim = parser.popDimension();
      parser.getSettings().setParIndent(dim);
   }
}
