uk.ac.ed.ph.snuggletex.dombuilding.MathRootHandler Maven / Gradle / Ivy

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/* $Id: MathRootHandler.java 525 2010-01-05 14:07:36Z davemckain $
 *
 * Copyright (c) 2010, The University of Edinburgh.
 * All Rights Reserved
 */
package uk.ac.ed.ph.snuggletex.dombuilding;

import uk.ac.ed.ph.snuggletex.internal.DOMBuilder;
import uk.ac.ed.ph.snuggletex.internal.SnuggleParseException;
import uk.ac.ed.ph.snuggletex.tokens.ArgumentContainerToken;
import uk.ac.ed.ph.snuggletex.tokens.CommandToken;

import org.w3c.dom.Element;

/**
 * Handles the LaTeX \\sqrt command, which generates either a msqrt or
 * mroot depending on whether an optional argument has been passed or not.
 *
 * @author David McKain
 * @version $Revision: 525 $
 */
public final class MathRootHandler implements CommandHandler {

  public void handleCommand(DOMBuilder builder, Element parentElement, CommandToken token)
      throws SnuggleParseException {
    ArgumentContainerToken optionalArgument = token.getOptionalArgument();
    ArgumentContainerToken requiredArgument = token.getArguments()[0];
    Element result;
    if (optionalArgument != null) {
      /* Has optional argument, so generate  */
      result = builder.appendMathMLElement(parentElement, "mroot");
      builder.handleMathTokensAsSingleElement(result, requiredArgument);
      builder.handleMathTokensAsSingleElement(result, optionalArgument);
    } else {
      /* No optional argument, so do  */
      result = builder.appendMathMLElement(parentElement, "msqrt");
      builder.handleMathTokensAsSingleElement(result, requiredArgument);
    }
  }
}