mcs/class/Microsoft.JScript/Microsoft.JScript/IdentificationTable.cs

   1 //
   2 // ExecutionContext.cs: The stack of possible executions environments.
   3 //
   4 // Author:
   5 //      Cesar Lopez Nataren
   6 //
   7 // (C) 2003, Cesar Lopez Nataren
   8 //
   9
  10 using System.Collections;
  11 using System.Text;
  12
  13 namespace Microsoft.JScript {
  14
  15         internal class IdentificationTable {
  16
  17                 internal Stack stack;
  18
  19                 internal IdentificationTable ()
  20                 {
  21                         stack = new Stack ();
  22                         stack.Push (new SymbolTable (null));
  23                 }
  24
  25                 internal void OpenBlock ()
  26                 {
  27                         System.Console.WriteLine ("IdTable::OpenBlock");
  28
  29                         SymbolTable parent = (SymbolTable) stack.Peek ();
  30                         stack.Push (new SymbolTable (parent));
  31                 }
  32
  33                 internal void CloseBlock ()
  34                 {
  35                         System.Console.WriteLine ("IdTable::CloseBlock");
  36                         stack.Pop ();
  37                 }
  38
  39                 internal void Enter (string id, object decl)
  40                 {
  41                         ((SymbolTable) stack.Peek ()).Add (id , decl);
  42                         System.Console.WriteLine ("IdentificationTable::Enter::{0}", id);
  43                 }
  44
  45                 internal AST Retrieve (string id)
  46                 {
  47                         return ((SymbolTable) stack.Peek ()).Retrieve (id);
  48                 }
  49
  50                 internal bool Contains (string id)
  51                 {
  52                         SymbolTable parent, current_scope = (SymbolTable) stack.Peek ();
  53                         bool found = current_scope.Contains (id);
  54
  55                         if (found)
  56                                 return true;
  57                         else {
  58                                 parent = current_scope.parent;
  59
  60                                 if (parent != null)
  61                                         found = parent.Contains (id);
  62                         }
  63                         return found;
  64                 }
  65
  66                 public override string ToString ()
  67                 {
  68                         StringBuilder sb = new StringBuilder ();
  69
  70                         int i, size = stack.Count;
  71
  72                         for (i = 0; i < size; i++)
  73                                 sb.Append (stack.Pop ().ToString ());
  74
  75                         return sb.ToString ();
  76                 }
  77         }
  78 }