add from giga-device, new branch added

StgSharp.Script/Express/ExpNodeTempEnumerator.cs

@@ -0,0 +1,200 @@
+//-----------------------------------------------------------------------
+//-----------------------------------------------------------------------
+//     file="ExpNodeTempEnumerator.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.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StgSharp.Script.Express
+{
+    public static class ExpNodeNextEnumeratorExtensions
+    {
+
+        public static ExpNodeTempEnumerator AsCollectionEnumerator(
+                                            this ExpSyntaxNode token,
+                                            bool unpack )
+        {
+            ExpNodeTempEnumerator enumerator = new ExpNodeTempEnumerator( token, unpack );
+            IExpElementSource type = token.EqualityTypeConvert;
+            while( enumerator.MoveNext() )
+            {
+                if( enumerator. Current != type ) {
+                    throw new InvalidCastException();
+                }
+            }
+            return enumerator;
+        }
+
+        [MethodImpl( MethodImplOptions.AggressiveInlining )]
+        public static ExpNodePresidentEnumerator ToPresidentEnumerator( this ExpSyntaxNode node )
+        {
+            return new ExpNodePresidentEnumerator( node );
+        }
+
+        public static ExpNodePresidentEnumerator TupleToPresidentEnumerator(
+                                                 this ExpSyntaxNode tuple )
+        {
+            return new ExpNodePresidentEnumerator( tuple.Right );
+        }
+
+    }
+
+    public class ExpNodePresidentEnumerator : IEnumerator<ExpSyntaxNode>
+    {
+
+        private int _index = -1;
+        private List<ExpSyntaxNode> _begin = new List<ExpSyntaxNode>();
+
+        public ExpNodePresidentEnumerator( ExpSyntaxNode token )
+        {
+            _begin.Add( 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 => _begin[ _index ];
+
+        public int Count => _begin.Count;
+
+        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 Span<ExpSyntaxNode> AsSpan()
+        {
+            return CollectionsMarshal.AsSpan( _begin );
+        }
+
+        public void Dispose()
+        {
+            return;
+        }
+
+        public bool MoveNext()
+        {
+            if( _index < _begin.Count - 1 )
+            {
+                _index++;
+                return true;
+            }
+            return false;
+        }
+
+        public void Reset()
+        {
+            _index = -1;
+        }
+
+        object IEnumerator.Current => this.Current;
+
+    }
+
+    public class ExpNodeTempEnumerator : IEnumerator<ExpSyntaxNode>
+    {
+
+        private ExpSyntaxNode? _current,_begin;
+
+        public ExpNodeTempEnumerator( ExpSyntaxNode node )
+        {
+            _current = null;
+            _begin = node;
+        }
+
+        public ExpNodeTempEnumerator( ExpSyntaxNode node, bool unpack )
+        {
+            _current = null;
+            _begin = unpack ? node.Right : node;
+        }
+
+        public ExpSyntaxNode Current => _current!;
+
+        public bool MoveNext()
+        {
+            if( _current == null )
+            {
+                _current = _begin;
+                return true;
+            }
+            ExpSyntaxNode next = _current.Next;
+            if( ReferenceEquals( next, _begin ) || next == null ) {
+                return false;
+            }
+            _current = next;
+            return true;
+        }
+
+        void IDisposable.Dispose()
+        {
+            return;
+        }
+
+        void IEnumerator.Reset()
+        {
+            _current = null;
+        }
+
+        object IEnumerator.Current => _current;
+
+    }
+}