Sicherung

Kalk/Kalk.Core/Model/KalkExpressionWithMembers.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using Scriban;
+using Scriban.Parsing;
+using Scriban.Runtime;
+using Scriban.Syntax;
+
+namespace Kalk.Core
+{
+    public abstract class KalkExpressionWithMembers : KalkExpression
+    {
+        protected abstract (string, Func<KalkExpressionWithMembers, object> getter)[] Members { get; }
+
+        public override int Count => Members.Length;
+
+        public override IEnumerable<string> GetMembers()
+        {
+            foreach (var memberPair in Members) yield return memberPair.Item1;
+        }
+
+        public override bool Contains(string member)
+        {
+            foreach (var memberPair in Members)
+                if (memberPair.Item1 == member)
+                    return true;
+            return false;
+        }
+
+        public override bool IsReadOnly { get; set; }
+
+        public override bool TryGetValue(TemplateContext context, SourceSpan span, string member, out object value)
+        {
+            value = null;
+            foreach (var memberPair in Members)
+            {
+                if (memberPair.Item1 == member)
+                {
+                    value = memberPair.Item2(this);
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        public override bool CanWrite(string member) => false;
+
+        public override bool TrySetValue(TemplateContext context, SourceSpan span, string member, object value, bool readOnly) => false;
+
+        public override bool Remove(string member) => false;
+
+        public override void SetReadOnly(string member, bool readOnly) => throw new NotSupportedException("A member of Unit is readonly by default and cannot be modified");
+
+    }
+}