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StgSharp.Script/Express/ExpAstNode/ExpBaseNode.cs

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+//-----------------------------------------------------------------------
+//-----------------------------------------------------------------------
+//     file="ExpBaseNode.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 CommunityToolkit.HighPerformance.Buffers;
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StgSharp.Script.Express
+{
+    public abstract class ExpBaseNode : IASTNode<ExpBaseNode, IExpElementSource>
+    {
+
+        protected internal ExpNodeFlag _nodeFlag;
+        protected internal string _name;
+
+        protected ExpBaseNode( string name, ExpSchema context )
+        {
+            _name = name;
+            NameSpace = context;
+            Next = this;
+            Previous = this;
+        }
+
+        public bool IsNumber
+        {
+            get { return ( _nodeFlag | ExpNodeFlag.BuiltinType_Number ) != 0; }
+        }
+
+        public abstract ExpBaseNode Left
+        {
+            get;
+        }
+
+        public static ExpBaseNode Empty
+        {
+            get => ExpEmptyNode._only;
+        }
+
+        public ExpBaseNode Next
+        {
+            get;
+            set;
+        }
+
+        public abstract ExpBaseNode Right
+        {
+            get;
+        }
+
+        public ExpBaseNode Previous
+        {
+            get;
+            set;
+        }
+
+        public ExpSchema NameSpace
+        {
+            get;
+            private set;
+        }
+
+        public abstract IExpElementSource EqualityTypeConvert
+        {
+            get;
+        }
+
+        public long NodeFlag => ( long )_nodeFlag;
+
+        public string CodeConvertTemplate
+        {
+            get;
+            internal set;
+        }
+
+        public string Name => _name;
+
+        public virtual void AppendNode( ExpBaseNode nextToken )
+        {
+            Next.Previous = nextToken;
+            nextToken.Next = Next;
+            Next = nextToken;
+            Next.Previous = this;
+        }
+
+        public ExpNodeNextEnumerator GetEnumerator()
+        {
+            return new ExpNodeNextEnumerator( this );
+        }
+
+        public static bool IsNullOrEmpty( ExpBaseNode node )
+        {
+            return  node == ExpEmptyNode._only || node == null;
+        }
+
+        public static bool VerifyTypeConvertable(
+                                   ExpBaseNode left,
+                                   ExpBaseNode right )
+        {
+            IExpElementSource tLeft = left.EqualityTypeConvert,
+                tRight = right.EqualityTypeConvert;
+            if( tLeft == null || tRight == null ) {
+                return false;
+            }
+            return tLeft.IsConvertable( tRight );
+        }
+
+        protected void AssertSchemaInclude( ExpBaseNode expressionRoot )
+        {
+            if( expressionRoot.NameSpace != NameSpace && NameSpace.TryGetSchemaInclude(
+                expressionRoot.NameSpace.Name, out _ ) ) {
+                throw new ExpInvalidSchemaIncludeException(
+                    NameSpace, expressionRoot.NameSpace );
+            }
+        }
+
+        private class ExpEmptyNode : ExpBaseNode
+        {
+
+            internal static readonly ExpEmptyNode _only = new();
+
+            public ExpEmptyNode()
+                : base( string.Empty, ExpSchema.BuiltinSchema ) { }
+
+            public override ExpBaseNode Left => _only;
+
+            public override ExpBaseNode Right => _only;
+
+            public override ExpInstantiableElementBase EqualityTypeConvert => ExpInstantiableElementBase.Void;
+
+        }
+
+    }
+}