code: /**
   * Copyright (c) 2004-2005, Regents of the University of California
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * Redistributions of source code must retain the above copyright notice,
   * this list of conditions and the following disclaimer.
   *
   * Redistributions in binary form must reproduce the above copyright
   * notice, this list of conditions and the following disclaimer in the
   * documentation and/or other materials provided with the distribution.
   *
   * Neither the name of the University of California, Los Angeles nor the
   * names of its contributors may be used to endorse or promote products
   * derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package jintgen.isdl;
  
  import cck.text.StringUtil;
  import jintgen.isdl.parser.Token;
  import java.util.*;
  
  /**
   * The <code>SymbolMapping</code> class represents a class that maps string symbols
   * (names) to an integer. This mapping is used in encoding such things as register
   * names into instructions, for example.
   *
   * @author Ben L. Titzer
   */
  public class SymbolMapping {
  
      public final Token name;
      final HashMap<String, Entry> mapping;
      final List<Entry> list;
  
      public SymbolMapping(Token n) {
          name = n;
          mapping = new HashMap<String, Entry>();
          list = new LinkedList<Entry>();
      }
  
      /**
       * The <code>add()</code> method adds a new symbol mapped to a new value to this list of
       * mappings.
       * @param sym the token representing the symbol name
       * @param val the integer value for this symbol
       */
      public void add(Token sym, Token val) {
          String name = sym.image;
          Entry entry = new Entry(sym, val);
          mapping.put(name, entry);
          list.add(entry);
      }
  
      /**
       * The <code>getEntries()</code> method returns an iterable over the entries in this map.
       * @return an iterable capable of iterating over all of the entries in the map
       */
      public Iterable<Entry> getEntries() {
          return list;
      }
  
      public Entry get(String name) {
          return mapping.get(name);
      }
  
      public int size() {
          return list.size();
      }
  
      public static class Entry {
          public final Token ntoken;
          public final Token vtoken;
  
          public final String name;
          public final int value;
  
          Entry(Token n, Token v) {
              ntoken = n;
              vtoken = v;
              name = ntoken.image;
              value = StringUtil.evaluateIntegerLiteral(v.image);
          }
      }
  }
  