Sicherung

Kalk/Kalk.Core/KalkAliases.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Scriban;
+using Scriban.Parsing;
+using Scriban.Runtime;
+using Scriban.Syntax;
+
+namespace Kalk.Core
+{
+    public class KalkAliases : ScriptObject, IScriptCustomFunction
+    {
+        public KalkAliases()
+        {
+            Aliases = new Dictionary<string, string>();
+        }
+
+        public Dictionary<string, string> Aliases { get; }
+
+        public int RequiredParameterCount => 0;
+
+        public int ParameterCount => 0;
+
+        public ScriptVarParamKind VarParamKind => ScriptVarParamKind.None;
+
+        public Type ReturnType => typeof(object);
+
+        public ScriptParameterInfo GetParameterInfo(int index)
+        {
+            throw new NotSupportedException("Aliases don't have any parameters.");
+        }
+       
+        public void AddAlias(KalkAlias alias)
+        {
+            if (alias == null) throw new ArgumentNullException(nameof(alias));
+            Add(alias.Name, alias);
+
+            foreach (string aliasName in alias.Aliases)
+            {
+                Aliases[aliasName] = alias.Name;
+            }
+        }
+
+        public bool TryGetAlias(string name, out string alias)
+        {
+            return Aliases.TryGetValue(name, out alias);
+        }
+        
+        public bool TryGetValue(string key, out KalkAlias value)
+        {
+            value = null;
+            if (TryGetValue(null, new SourceSpan(), key, out var valueObj))
+            {
+                value = (KalkAlias) valueObj;
+                return true;
+            }
+            return false;
+        }
+        
+        public override bool TrySetValue(TemplateContext context, SourceSpan span, string member, object value, bool readOnly)
+        {
+            // In the case of using KalkSymbols outside of the scripting engine
+            if (context == null) return base.TrySetValue(null, span, member, value, readOnly);
+
+            // Otherwise, we are not allowing to modify this object.
+            throw new ScriptRuntimeException(span, "Aliases object can't be modified directly. You need to use the command `shortcut` instead.");
+        }
+
+        public object Invoke(TemplateContext context, ScriptNode callerContext, ScriptArray arguments, ScriptBlockStatement blockStatement)
+        {
+            if (!(callerContext.Parent is ScriptExpressionStatement))
+            {
+                return this;
+            }
+
+            Display((KalkEngine)context, "Builtin Aliases", filter => !filter.IsUser);
+            Display((KalkEngine) context, "User-defined Aliases", filter => filter.IsUser);
+            return null;
+        }
+
+        public void Display(KalkEngine engine, string title, Func<KalkAlias, bool> filter = null, bool addBlankLine = false)
+        {
+            if (engine == null) throw new ArgumentNullException(nameof(engine));
+            if (title == null) throw new ArgumentNullException(nameof(title));
+
+            bool isFirst = true;
+            foreach (var aliasKey in this.Keys.OrderBy(x => x))
+            {
+                var alias = this[aliasKey] as KalkAlias;
+                if (alias == null || (filter != null && !filter(alias))) continue;
+
+                if (isFirst)
+                {
+                    engine.WriteHighlightLine($"# {title}");
+                }
+                else if (addBlankLine)
+                {
+                    engine.WriteHighlightLine("");
+                }
+                isFirst = false;
+
+                engine.WriteHighlightLine(alias.ToString());
+            }
+        }
+        
+        public ValueTask<object> InvokeAsync(TemplateContext context, ScriptNode callerContext, ScriptArray arguments, ScriptBlockStatement blockStatement)
+        {
+            return new ValueTask<object>(Invoke(context, callerContext, arguments, blockStatement));
+        }
+    }
+}