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package com.googlecode.gwt.test.finder;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.antlr.runtime.ANTLRStringStream;
import org.antlr.runtime.BitSet;
import org.antlr.runtime.CharStream;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.IntStream;
import org.antlr.runtime.MismatchedTokenException;
import org.antlr.runtime.RecognitionException;

public class Node {

   static class TokenException extends RuntimeException {

      private static final long serialVersionUID = 7666850302524423170L;

   }

   public static Node parse(String s) {
      try {
         CharStream is = new ANTLRStringStream(s);
         XPathLexer lexer = new XPathLexer(is) {

            public void recover(RecognitionException re) {
               throw new TokenException();
            }

         };
         CommonTokenStream stream = new CommonTokenStream(lexer);
         XPathParser parser = new XPathParser(stream) {

            protected void mismatch(IntStream input, int ttype, BitSet follow)
                     throws RecognitionException {
               throw new MismatchedTokenException(ttype, input);
            }

         };
         parser.expr();
         return parser.root;
      } catch (RecognitionException e) {
         return null;
      } catch (TokenException e) {
         return null;
      }

   }

   private String label;

   private String map;

   private Node map_eq;

   private Node next;

   private List paramList;

   public Node() {
   }

   public Node(String label) {
      this.label = label;
   }

   public String getLabel() {
      return label;
   }

   public String getMap() {
      return map;
   }

   public Node getMapEq() {
      return map_eq;
   }

   public Node getNext() {
      return next;
   }

   public List getParams() {
      return paramList == null ? null : Collections.unmodifiableList(paramList);
   }

   public void insertParam(String param) {
      if (this.paramList == null) {
         this.paramList = new ArrayList();
      }
      this.paramList.add(0, param);
   }

   public void setLabel(String label) {
      this.label = label;
   }

   public void setMap(String map) {
      this.map = map;
   }

   public void setMapEq(Node n) {
      this.map_eq = n;
   }

   public void setNext(Node next) {
      this.next = next;
   }

   public String toString() {
      String s = "/" + label;
      if (paramList != null) {
         s += "(";
         for (String p : paramList) {
            s += p + ",";
         }
         s += ")";
      }
      if (map_eq == null && map != null) {
         s += "{" + map + "}";
      }
      if (map_eq != null && map != null) {
         s += "[" + map_eq.toString() + "=" + map + "]";
      }

      if (next != null) {
         s += next.toString();
      }
      return s;
   }
}