add from giga-device, new branch added

StgSharp.Script/Express/Element/ExpConst.cs

@@ -0,0 +1,104 @@
+//-----------------------------------------------------------------------
+//-----------------------------------------------------------------------
+//     file="ExpConst.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;
+using System.Collections.Frozen;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq.Expressions;
+using System.Runtime.CompilerServices;
+using System.Text;
+
+namespace StgSharp.Script.Express
+{
+    public sealed class ExpConstantCollectionSource : ExpImmutableElement
+    {
+
+        private Dictionary<string, ExpElementInstance> _constants;
+        private IScriptSourceProvider _sourceProvider;
+
+        public ExpConstantCollectionSource( IScriptSourceProvider sourceProvider )
+        {
+            _sourceProvider = sourceProvider;
+            _constants = new Dictionary<string, ExpElementInstance>( ExpressCompile.Multiplexer );
+        }
+
+        public override ExpElementType ElementType => ExpElementType.Const;
+
+        public override IScriptSourceProvider SourceProvider => _sourceProvider;
+
+        public override string Name
+        {
+            get => ExpressCompile.Keyword.Constant;
+        }
+
+        public override void Analyse()
+        {
+            throw new NotImplementedException();
+        }
+
+        public override ExpSyntaxNode MakeReference( params object[] options )
+        {
+            if( options.Length == 0 || options[ 0 ] is not string str ) {
+                return null!;
+            }
+            if( _constants.Count == 0 ) {
+                return null!;
+            }
+            if( _constants.TryGetValue( str, out ExpElementInstance? token ) ) {
+                return token;
+            }
+            return null!;
+        }
+
+        public bool TryGetConstant( string name, out ExpElementInstance instance )
+        {
+            return _constants.TryGetValue( name, out instance );
+        }
+
+        public override bool TryGetMember( string name, out ExpSyntaxNode memberNode )
+        {
+            if( _constants.TryGetValue( name, out ExpElementInstance? node ) )
+            {
+                memberNode = node;
+                return true;
+            }
+            memberNode = ExpSyntaxNode.Empty;
+            return false;
+        }
+
+        internal void AddConstant( string name, ExpElementInstance value )
+        {
+            _constants.Add( name, value );
+        }
+
+    }
+}