Init

2026-06-17 20:44:53 +03:00
parent 9d153773c2
commit b133e7c656
1880 changed files with 244545 additions and 0 deletions
@@ -0,0 +1,59 @@
+using QFSW.QC.Utilities;
+using System;
+using System.Text.RegularExpressions;
+
+namespace QFSW.QC.Grammar
+{
+    public class ExpressionBodyGrammar : IQcGrammarConstruct
+    {
+        private readonly Regex _expressionBodyRegex = new Regex(@"^{.+}\??$");
+
+        public int Precedence => 0;
+
+        public bool Match(string value, Type type)
+        {
+            return _expressionBodyRegex.IsMatch(value);
+        }
+
+        public object Parse(string value, Type type, Func<string, Type, object> recursiveParser)
+        {
+            bool nullable = false;
+            if (value.EndsWith("?"))
+            {
+                nullable = true;
+                value = value.Substring(0, value.Length - 1);
+            }
+
+            value = value.ReduceScope('{', '}');
+            object result = QuantumConsoleProcessor.InvokeCommand(value);
+
+            if (result is null)
+            {
+                if (nullable)
+                {
+                    if (type.IsClass)
+                    {
+                        return result;
+                    }
+                    else
+                    {
+                        throw new ParserInputException($"Expression body {{{value}}} evaluated to null which is incompatible with the expected type '{type.GetDisplayName()}'.");
+                    }
+                }
+                else
+                {
+                    throw new ParserInputException($"Expression body {{{value}}} evaluated to null. If this is intended, please use nullable expression bodies, {{expr}}?");
+                }
+            }
+            else if (result.GetType().IsCastableTo(type, true))
+            {
+                return type.Cast(result);
+            }
+            else
+            {
+                throw new ParserInputException($"Expression body {{{value}}} evaluated to an object of type '{result.GetType().GetDisplayName()}', " +
+                    $"which is incompatible with the expected type '{type.GetDisplayName()}'.");
+            }
+        }
+    }
+}