SymbolTable.cs

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// -------------------------------------------------------------------------- //
// Project rROTOR                                                             //
// -------------------------------------------------------------------------- //
// File: SymbolTable.cs                                                       //
// Author: Cristina Gonzalez Muñoz  -  cristi.gm@gmail.com                    //
// Description:                                                               //
//    Implementation of a symbol table.                                       //
// -------------------------------------------------------------------------- //
// Create date: 30-03-2007                                                    //
// Modification date: 30-03-2007                                              //

using System;
using System.Collections.Generic;
using System.Text;

using ErrorManagement;
using TypeSystem;

namespace Symbols
{
   class SymbolTable
   {
      #region Fields

      private List<Dictionary<string, Symbol>> table;

      #endregion

      #region Constructors

      public SymbolTable()
      {
         this.table = new List<Dictionary<string, Symbol>>();
      }

      #endregion

      #region Set()

      public void Set()
      {
         //scope++;
         this.table.Add(new Dictionary<string, Symbol>());
      }

      #endregion

      #region Reset()

      public void Reset()
      {
         //scope--;
         this.table.RemoveAt(this.table.Count - 1);
      }

      #endregion

      #region Insert()

      public Symbol Insert(string id, TypeExpression type, bool isDynamic)
      {
         if (this.table[this.table.Count - 1].ContainsKey(id))
            return null;
         Symbol s = new Symbol(id, this.table.Count - 1, type, isDynamic);
         this.table[this.table.Count - 1].Add(id, s);
         //Console.WriteLine(s.ToString());
         return s;
      }

      #endregion

      #region Search()

      public Symbol Search(string id)
      {
         int scope = this.table.Count - 1;

         while (scope >= 0)
         {
            if (this.table[scope].ContainsKey(id))
               return this.table[scope][id];
            else
               scope--;
         }
         return null;
      }

      #endregion
   }
}