Support wildcard dictionary element accessors

Author: nblumhardt

src/Serilog.Expressions/Expressions/Runtime/RuntimeOperators.cs

@@ -374,6 +374,11 @@ public static LogEventPropertyValue IsDefined(LogEventPropertyValue? value)
                 return ScalarBoolean(structure.Properties.Any(e => Coerce.IsTrue(pred(e.Value))));
             }
 
+            if (items is DictionaryValue dictionary)
+            {
+                return ScalarBoolean(dictionary.Elements.Any(e => Coerce.IsTrue(pred(e.Value))));
+            }
+
             return null;
         }
 
@@ -391,6 +396,11 @@ public static LogEventPropertyValue IsDefined(LogEventPropertyValue? value)
             {
                 return ScalarBoolean(structure.Properties.All(e => Coerce.IsTrue(pred(e.Value))));
             }
+            
+            if (items is DictionaryValue dictionary)
+            {
+                return ScalarBoolean(dictionary.Elements.All(e => Coerce.IsTrue(pred(e.Value))));
+            }
 
             return null;
         }

test/Serilog.Expressions.Tests/Cases/expression-evaluation-cases.asv

@@ -203,6 +203,12 @@ User.Name                            ⇶ 'nblumhardt'
 {k:'test'}[?] like 'TEST' ci         ⇶ true
 {k:'test'}[?] like '%TES%' ci        ⇶ true
 {k:'test'}[?] = 'none'               ⇶ false
+test_dict({k:'test'})[?] = 'test'               ⇶ true
+test_dict({k:'test'})[?] like 'test'            ⇶ true
+test_dict({k:'test'})[?] like 'TEST'            ⇶ false
+test_dict({k:'test'})[?] like 'TEST' ci         ⇶ true
+test_dict({k:'test'})[?] like '%TES%' ci        ⇶ true
+test_dict({k:'test'})[?] = 'none'               ⇶ false
 
 // Text and regex
 ismatch('foo', 'f')                  ⇶ true

test/Serilog.Expressions.Tests/ExpressionEvaluationTests.cs

@@ -27,8 +27,9 @@ public void ExpressionsAreCorrectlyEvaluated(string expr, string result)
                 })));
 
             var frFr = CultureInfo.GetCultureInfoByIetfLanguageTag("fr-FR");
-            var actual = SerilogExpression.Compile(expr, formatProvider: frFr)(evt);
-            var expected = SerilogExpression.Compile(result)(evt);
+            var testHelpers = new TestHelperNameResolver();
+            var actual = SerilogExpression.Compile(expr, formatProvider: frFr, testHelpers)(evt);
+            var expected = SerilogExpression.Compile(result, nameResolver: testHelpers)(evt);
 
             if (expected is null)
             {

test/Serilog.Expressions.Tests/Support/TestHelperNameResolver.cs

@@ -0,0 +1,31 @@
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using System.Reflection;
+using Serilog.Events;
+
+namespace Serilog.Expressions.Tests.Support;
+
+public class TestHelperNameResolver: NameResolver
+{
+    public override bool TryResolveFunctionName(string name, [MaybeNullWhen(false)] out MethodInfo implementation)
+    {
+        if (name == "test_dict")
+        {
+            implementation = GetType().GetMethod(nameof(TestDict))!;
+            return true;
+        }
+
+        implementation = null;
+        return false;
+    }
+
+    public static LogEventPropertyValue? TestDict(LogEventPropertyValue? value)
+    {
+        if (value is not StructureValue sv)
+            return null;
+
+        return new DictionaryValue(sv.Properties.Select(kv =>
+            KeyValuePair.Create(new ScalarValue(kv.Name), kv.Value)));
+    }
+}