/**
 * $Id: $
 * $Date: $
 *
 */

package org.xmlsh.sh.core;

import java.io.PrintWriter;
import org.xmlsh.core.EvalEnv;
import org.xmlsh.core.EvalFlag;

/*
 * BraceWord represents the syntax { expr } , {expr ...} and { expr : expr ,
 * expr : expr ... }
 * 
 * Evaluating produces either
 * A) the result of expr exactly
 * B) XList<> of exprs
 * C) XList<> of { expr or property }*
 * D) XMap<>
 * 
 * 
 * 
 */
public class BraceWord extends ListWord {

  public BraceWord(WordList wl) {
    super(wl.getFirstToken());
    ListWord list = null;
    Word simple;
    for(Word w : wl) {
      if(w.isDelim()) {
        super.add(list);
        list = null;
      }
      else {
        if(list == null)
          list = new ListWord(w.getFirstToken());
        list.add(w);
      }
    }
    if(list != null)
      super.add(list);

  }

  @Override
  public void print(PrintWriter out) {
    out.print("{");
    String sep = "";
    for(Word w : super.mList) {
      w.print(out);
      out.print(sep);
      sep = "";
    }
    out.print("}");
  }

  @Override
  public String getSimpleName() {
    return isEmpty() ? "{}" : mList.get(0).getSimpleName() + "...";
  }

  /*
   * (non-Javadoc)
   * 
   * @see org.xmlsh.sh.core.Word#evalEnv(org.xmlsh.core.EvalEnv)
   */
  @Override
  public EvalEnv evalEnv(EvalEnv parent) {
    return parent.withFlagsMasked(EvalFlag.preserveValueFlags());
  }

  /*
   * 
   * Call ListWord to expand
   * 
   * @Override
   * protected ParseResult expandToResult(Shell shell, EvalEnv env,
   * SourceLocation loc, ParseResult result) throws IOException,
   * CoreException
   * {
   * if( mList.isEmpty() )
   * return result ;
   * if( mList.size() == 1 )
   * return mList.get(0).expandToResult(shell, evalEnv(env), loc, result);
   * 
   * 
   * // Sequence ...
   * XValue xv = null ;
   * for( Word w : mList ) {
   * XValue wv = w.expand(shell , evalEnv(env), loc);
   * if( xv == null )
   * xv = wv ;
   * else
   * xv = xv.append( wv );
   * }
   * 
   * 
   * result.add( xv );
   * return result ;
   * 
   * }
   */

}

/*
 * Copyright (C) 2008-2012 David A. Lee.
 * 
 * The contents of this file are subject to the "Simplified BSD License" (the
 * "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.opensource.org/licenses/bsd-license.php
 * 
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 * 
 * The Original Code is: all this file.
 * 
 * The Initial Developer of the Original Code is David A. Lee
 * 
 * Portions created by (your name) are Copyright (C) (your legal entity). All
 * Rights Reserved.
 * 
 * Contributor(s): David A. Lee
 */