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StgSharp.Script/TokenNodeStack.cs

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+//-----------------------------------------------------------------------
+//-----------------------------------------------------------------------
+//     file="TokenNodeStack.cs"
+//     Project: StgSharp
+//     AuthorGroup: Nitload Space
+//     Copyright (c) Nitload Space. All rights reserved.
+//     
+//     Permission is hereby granted, free of charge, to any person 
+//     obtaining a copy of this software and associated documentation 
+//     files (the “Software”), to deal in the Software without restriction, 
+//     including without limitation the rights to use, copy, modify, merge,
+//     publish, distribute, sublicense, and/or sell copies of the Software, 
+//     and to permit persons to whom the Software is furnished to do so, 
+//     subject to the following conditions:
+//     
+//     The above copyright notice and 
+//     this permission notice shall be included in all copies 
+//     or substantial portions of the Software.
+//     
+//     THE SOFTWARE IS PROVIDED “AS IS”, 
+//     WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
+//     INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+//     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
+//     IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
+//     DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
+//     ARISING FROM, OUT OF OR IN CONNECTION WITH 
+//     THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//     
+//-----------------------------------------------------------------------
+//-----------------------------------------------------------------------
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StgSharp.Script
+{
+    public class TokenNodeStack<TNode, TType>
+        where TNode: IASTNode<TNode, TType>
+        where TType: ITypeSource<TType>
+    {
+
+        private Stack<bool> _isNode;
+
+        private Stack<TNode> _nodes;
+        private Stack<Token> _tokens;
+
+        public TokenNodeStack()
+        {
+            _nodes = new Stack<TNode>( 4 );
+            _tokens = new Stack<Token>( 4 );
+            _isNode = new Stack<bool>( 8 );
+        }
+
+        public int Count => _isNode.Count;
+
+        public bool Peek( out Token t, TNode n )
+        {
+            if( _isNode.Peek() ) {
+                n = _nodes.Peek();
+                t = Token.Empty;
+                return true;
+            } else {
+                t = _tokens.Peek();
+                n = TNode.Empty;
+                return false;
+            }
+        }
+
+        public bool Pop( out Token t, out TNode n )
+        {
+            if( _isNode.Pop() ) {
+                n = _nodes.Pop();
+                t = Token.Empty;
+                return true;
+            } else {
+                t = _tokens.Pop();
+                n = TNode.Empty;
+                return false;
+            }
+        }
+
+        public void Push( TNode node )
+        {
+            _nodes.Push( node );
+            _isNode.Push( true );
+        }
+
+        public void Push( Token token )
+        {
+            _tokens.Push( token );
+            _isNode.Push( false );
+        }
+
+    }
+}