idetable.java

这个是java版本的pl0语言的词法分析器,带有图形界面,很好的

package myCompiler;

import java.util.Enumeration;
import java.util.Hashtable;

public class IDETable {
	  static Hashtable<String, String> IDEHash;
static	String[] ident={"+","-","*","/","=","#","<","<=",">",">=",".",",",";",
				":=","(",")","DIGIT","IDENTITIER","$"};
	static int idelen=ident.length;
	 public static void initIDETable(){
		    IDEHash = new Hashtable<String, String>(); 
		   for (int i=0;i<idelen;i++)
		      IDEHash.put(Integer.toString(i+14), ident[i]);
	 }
	  public static   int findKey(String ident) {
		   int KEY;
		    for (Enumeration<String> e = IDEHash.keys(); e.hasMoreElements(); ) {
		      KEY = Integer.parseInt( (String) e.nextElement());
		      if ( ( (String)IDEHash.get(Integer.toString(KEY))).
		          equalsIgnoreCase(ident)) {
		        return KEY;
		      }
		    }
		    return -1;
	  }

	 
}