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StgSharp.Script/Express/ExpNodeNextEnumerator.cs

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+//-----------------------------------------------------------------------
+//-----------------------------------------------------------------------
+//     file="ExpNodeNextEnumerator.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 Microsoft.CodeAnalysis.CSharp.Syntax;
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StgSharp.Script.Express
+{
+    public static class ExpNodeNextEnumeratorExtensions
+    {
+
+        public static ExpNodeNextEnumerator AsCollectionEnumerator( this ExpSyntaxNode token )
+        {
+            ExpNodeNextEnumerator enumerator = new ExpNodeNextEnumerator( token );
+            IExpElementSource type = token.EqualityTypeConvert;
+            while( enumerator.MoveNext() )
+            {
+                if( enumerator. Current != type ) {
+                    throw new InvalidCastException();
+                }
+            }
+            return enumerator;
+        }
+
+        [MethodImpl( MethodImplOptions.AggressiveInlining )]
+        public static ExpNodeNextEnumerator ToEnumerator( this ExpSyntaxNode token )
+        {
+            return new ExpNodeNextEnumerator( token );
+        }
+
+    }
+
+    public class ExpNodeNextEnumerator : IEnumerator<ExpSyntaxNode>
+    {
+
+        private ExpSyntaxNode _current;
+
+        private List<ExpSyntaxNode> _begin = new List<ExpSyntaxNode>();
+
+        public ExpNodeNextEnumerator( ExpSyntaxNode token )
+        {
+            _begin[ 0 ] = token;
+            _current = token;
+            ExpSyntaxNode t = token;
+            while( !ReferenceEquals( t.Next, token ) && t.Next != null )
+            {
+                t = t.Next;
+                _begin.Add( t );
+            }
+        }
+
+        public ExpSyntaxNode this[ int index ]
+        {
+            get
+            {
+                ArgumentOutOfRangeException.ThrowIfNegative( index );
+                ArgumentOutOfRangeException.ThrowIfGreaterThan( index, _begin.Count );
+                return _begin[ index ];
+            }
+        }
+
+        public ExpSyntaxNode Current => _current;
+
+        public List<ExpSyntaxNode> Values => _begin;
+
+        public void AssertEnumeratorCount( int count )
+        {
+            if( _begin.Count != count ) {
+                throw new InvalidOperationException(
+                    $"Enumerator count mismatch. Expected {count}, but got {_begin.Count}." );
+            }
+        }
+
+        public void AssertEnumeratorCount( int min, int max )
+        {
+            if( _begin.Count < min || _begin.Count > max ) {
+                throw new InvalidOperationException(
+                    $"Enumerator count mismatch. Expected between {min} and {max}, but got {_begin.Count}." );
+            }
+        }
+
+        public bool MoveNext()
+        {
+            ExpSyntaxNode next = _current.Next;
+            if( ReferenceEquals( next, _begin ) || next == null ) {
+                return false;
+            }
+            _current = next;
+            return true;
+        }
+
+        void IDisposable.Dispose()
+        {
+            return;
+        }
+
+        void IEnumerator.Reset()
+        {
+            _current = _begin[ 0 ];
+        }
+
+        object IEnumerator.Current => _current;
+
+    }
+}