LLkParser.cs :  » Inversion-of-Control-Dependency-Injection » Spring.net » Spring » Expressions » Parser » antlr » C# / CSharp Open Source

using System;
  
namespace Spring.Expressions.Parser.antlr{
  /*ANTLR Translator Generator
  * Project led by Terence Parr at http://www.jGuru.com
  * Software rights: http://www.antlr.org/license.html
  *
  * $Id:$
  */

  //
  // ANTLR C# Code Generator by Micheal Jordan
  //                            Kunle Odutola       : kunle UNDERSCORE odutola AT hotmail DOT com
  //                            Anthony Oguntimehin
  //
  // With many thanks to Eric V. Smith from the ANTLR list.
  //

  /*An LL(k) parser.
  *
  * @see antlr.Token
  * @see antlr.TokenBuffer
  * @see antlr.LL1Parser
  */
  public class LLkParser : Parser
  {
    internal int k;
    
    public LLkParser(int k_)
    {
      k = k_;
    }
    public LLkParser(ParserSharedInputState state, int k_)
    {
      k = k_;
      inputState = state;
    }
    public LLkParser(TokenBuffer tokenBuf, int k_)
    {
      k = k_;
      setTokenBuffer(tokenBuf);
    }
    public LLkParser(TokenStream lexer, int k_)
    {
      k = k_;
      TokenBuffer tokenBuf = new TokenBuffer(lexer);
      setTokenBuffer(tokenBuf);
    }
    /*Consume another token from the input stream.  Can only write sequentially!
    * If you need 3 tokens ahead, you must consume() 3 times.
    * <p>
    * Note that it is possible to overwrite tokens that have not been matched.
    * For example, calling consume() 3 times when k=2, means that the first token
    * consumed will be overwritten with the 3rd.
    */
    override public void  consume()
    {
      inputState.input.consume();
    }
    override public int LA(int i)
    {
      return inputState.input.LA(i);
    }
    override public IToken LT(int i)
    {
      return inputState.input.LT(i);
    }
    private void  trace(string ee, string rname)
    {
      traceIndent();
      Console.Out.Write(ee + rname + ((inputState.guessing > 0)?"; [guessing]":"; "));
       for (int i = 1; i <= k; i++)
      {
        if (i != 1)
        {
          Console.Out.Write(", ");
        }
        if ( LT(i)!=null ) {
          Console.Out.Write("LA(" + i + ")==" + LT(i).getText());
        }
        else 
        {
          Console.Out.Write("LA(" + i + ")==ull");
        }
      }
      Console.Out.WriteLine("");
    }
    override public void  traceIn(string rname)
    {
      traceDepth += 1;
      trace("> ", rname);
    }
    override public void  traceOut(string rname)
    {
      trace("< ", rname);
      traceDepth -= 1;
    }
  }
}