reservedwordtable.java~28~

我用java写的词法分析器

package 编译技术;

import java.util.*;

public class ReservedWordTable
{
  private Hashtable reservedWordTable = new Hashtable(19);
  public ReservedWordTable()
  {
    //reservedWordTable.put("0", "#");
    reservedWordTable.put("1", "begin");
    reservedWordTable.put("2", "if");
    reservedWordTable.put("3", "then");
    reservedWordTable.put("4", "while");
    reservedWordTable.put("5", "do");
    reservedWordTable.put("6", "end");
  }

 /* public boolean isKeyWord(String inw)
  {
    String resWord;
    //查找hash表
    for (Enumeration e = reservedWordTable.elements(); e.hasMoreElements(); )
    {
      resWord = (String) e.nextElement();
      if (resWord.equalsIgnoreCase(inw))
      {
        return true;
      }
    }
    return false;
  }*/

   public int getKeyWordType(String classWord)
   {
     int KEY;
     for (Enumeration e = this.reservedWordTable.keys(); e.hasMoreElements(); )
     {
       KEY = Integer.parseInt( (String) e.nextElement());
       if ( ( (String)this.reservedWordTable.get(Integer.toString(KEY))).
           equalsIgnoreCase(classWord))
       {
         return KEY;
       }
     }
     return -1;
   }
}