2 // ExecutionContext.cs: The stack of possible executions environments.
7 // (C) 2003, Cesar Lopez Nataren
11 // Permission is hereby granted, free of charge, to any person obtaining
12 // a copy of this software and associated documentation files (the
13 // "Software"), to deal in the Software without restriction, including
14 // without limitation the rights to use, copy, modify, merge, publish,
15 // distribute, sublicense, and/or sell copies of the Software, and to
16 // permit persons to whom the Software is furnished to do so, subject to
17 // the following conditions:
19 // The above copyright notice and this permission notice shall be
20 // included in all copies or substantial portions of the Software.
22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 using System
.Collections
;
34 namespace Microsoft
.JScript
{
36 internal class IdentificationTable
{
40 internal IdentificationTable ()
43 stack
.Push (new SymbolTable (null));
46 internal void OpenBlock ()
48 SymbolTable parent
= (SymbolTable
) stack
.Peek ();
49 stack
.Push (new SymbolTable (parent
));
52 internal void CloseBlock ()
57 internal void Enter (string id
, object decl
)
59 ((SymbolTable
) stack
.Peek ()).Add (id
, decl
);
62 internal void Remove (string id
)
64 ((SymbolTable
) stack
.Peek ()).Remove (id
);
67 // It'll return the object asociated with the 'id', if found.
69 internal object Contains (string id
)
71 SymbolTable parent
, current_scope
= (SymbolTable
) stack
.Peek ();
72 object found
= current_scope
.Contains (id
);
75 parent
= current_scope
.parent
;
78 found
= parent
.Contains (id
);
83 public override string ToString ()
85 StringBuilder sb
= new StringBuilder ();
87 int i
, size
= stack
.Count
;
89 for (i
= 0; i
< size
; i
++)
90 sb
.Append (stack
.Pop ().ToString ());
92 return sb
.ToString ();
95 internal int num_of_locals
{
96 get { return ((SymbolTable) stack.Peek ()).size; }
99 internal DictionaryEntry
[] current_locals
{
100 get { return ((SymbolTable) stack.Peek ()).current_symbols; }