Савенко Дмитрий

ObjectPrinting/ObjectPrinterExtensions.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace ObjectPrinting;
+
+public static class ObjectPrinterExtensions
+{
+    public static string PrintToString<T>(this T? obj)
+    {
+        return ObjectPrinter.For<T>().PrintToString(obj);   
+    }
+
+    public static string PrintToString<T>(this T? obj, Func<PrintingConfig<T>, PrintingConfig<T>> printConfig)
+    {
+        return printConfig(ObjectPrinter.For<T>()).PrintToString(obj);
+    } 
+}

ObjectPrinting/ObjectPrinting.csproj

@@ -5,6 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="FluentAssertions" Version="8.0.0-alpha.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="NUnit" Version="4.2.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />

ObjectPrinting/PrintingConfig.cs

@@ -1,41 +1,168 @@
 using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
+using System.Linq.Expressions;
+using System.Reflection;
 using System.Text;
 
-namespace ObjectPrinting
+namespace ObjectPrinting;
+
+public class PrintingConfig<TOwner>
 {
-    public class PrintingConfig<TOwner>
+    private readonly Type[] primitiveTypes =
+    {
+        typeof(int),
+        typeof(double),
+        typeof(float),
+        typeof(string),
+        typeof(DateTime),
+        typeof(TimeSpan),
+        typeof(Guid)
+    };
+
+    private readonly HashSet<Type> excludingTypes = new();
+    private readonly HashSet<PropertyInfo> excludingProperties = new();
+
+    public Dictionary<Type, Func<object, string>> TypeSerializers { get; } = new();
+    public Dictionary<Type, CultureInfo> Cultures { get; } = new();
+    public Dictionary<PropertyInfo, Func<object, string>> PropertySerializers { get; } = new();
+    public Dictionary<PropertyInfo, int> PropertiesMaxLength { get; } = new();
+
+    public PrintingConfig<TOwner> Excluding<TPropertyType>()
+    {
+        excludingTypes.Add(typeof(TPropertyType));
+        return this;
+    }
+
+    public PrintingConfig<TOwner> Excluding<TProperty>(Expression<Func<TOwner, TProperty>> memberSelector)
+    {
+        excludingProperties.Add(GetProperty(memberSelector));
+        return this;
+    }
+
+    public TypePrintingConfig<TOwner, TPropertyType> For<TPropertyType>() => new(this);
+
+    public PropertyPrintingConfig<TOwner, TProperty> For<TProperty>(Expression<Func<TOwner, TProperty>> memberSelector)
+    {
+        return new PropertyPrintingConfig<TOwner, TProperty>(this, GetProperty(memberSelector));
+    } 
+
+    public string PrintToString(TOwner? obj)
+    {
+        return Serialize(obj, 0, new Dictionary<object?, int>());
+    }
+
+    private string Serialize(object? obj, int nestingLevel, Dictionary<object?, int> parsedObjects)
+    {
+        if (obj is null)
+        {
+            return "null";
+        }
+
+        if (primitiveTypes.Contains(obj.GetType()))
+        {
+            return obj + Environment.NewLine;
+        }
+
+        if (parsedObjects.TryGetValue(obj, out var level))
+        {
+            return $"<circular reference to {obj.GetType().Name} at level {level}>";
+        }
+
+        parsedObjects[obj] = nestingLevel;
+
+        return obj switch
+        {
+            IDictionary dictionary => SerializeDictionary(dictionary, nestingLevel, parsedObjects),
+            IEnumerable collection => SerializeCollection(collection, nestingLevel, parsedObjects),
+            _ => SerializeProperties(obj, nestingLevel, parsedObjects)
+        };
+    }
+
+    private string SerializeDictionary(IDictionary dictionary, int nestingLevel, Dictionary<object?, int> parsedObjects)
     {
-        public string PrintToString(TOwner obj)
+        var indentation = new string('\t', nestingLevel + 1);
+        var sb = new StringBuilder("Dictionary {\n");
+
+        foreach (DictionaryEntry kvp in dictionary)
         {
-            return PrintToString(obj, 0);
+            var key = Serialize(kvp.Key, nestingLevel + 1, parsedObjects).Trim();
+            var value = Serialize(kvp.Value, nestingLevel + 1, parsedObjects).Trim();
+            sb.AppendLine($"{indentation}{key} : {value}");
         }
 
-        private string PrintToString(object obj, int nestingLevel)
+        sb.AppendLine(new string('\t', nestingLevel) + "}");
+        return sb.ToString();
+    }
+
+    private string SerializeCollection(IEnumerable collection, int nestingLevel, Dictionary<object?, int> parsedObjects)
+    {
+        var indentation = new string('\t', nestingLevel + 1);
+        var sb = new StringBuilder("Collection [\n");
+
+        foreach (var element in collection)
         {
-            //TODO apply configurations
-            if (obj == null)
-                return "null" + Environment.NewLine;
+            var value = Serialize(element, nestingLevel + 1, parsedObjects).Trim();
+            sb.AppendLine($"{indentation}{value}");
+        }
+
+        sb.AppendLine(new string('\t', nestingLevel) + "]");
+        return sb.ToString();
+    }
 
-            var finalTypes = new[]
-            {
-                typeof(int), typeof(double), typeof(float), typeof(string),
-                typeof(DateTime), typeof(TimeSpan)
-            };
-            if (finalTypes.Contains(obj.GetType()))
-                return obj + Environment.NewLine;
+    private string SerializeProperties(object? obj, int nestingLevel, Dictionary<object?, int> parsedObjects)
+    {
+        var type = obj.GetType();
+        var sb = new StringBuilder($"{type.Name} {{\n");
+        var indentation = new string('\t', nestingLevel + 1);
+
+        foreach (var propertyInfo in type.GetProperties(BindingFlags.Public | BindingFlags.Instance))
+        {
+            if (excludingProperties.Contains(propertyInfo) 
+                || excludingTypes.Contains(propertyInfo.PropertyType))
+                continue;
 
-            var identation = new string('\t', nestingLevel + 1);
-            var sb = new StringBuilder();
-            var type = obj.GetType();
-            sb.AppendLine(type.Name);
-            foreach (var propertyInfo in type.GetProperties())
-            {
-                sb.Append(identation + propertyInfo.Name + " = " +
-                          PrintToString(propertyInfo.GetValue(obj),
-                              nestingLevel + 1));
-            }
-            return sb.ToString();
+            var serializedValue = SerializeProperty(propertyInfo, obj, nestingLevel + 1, parsedObjects);
+            sb.AppendLine($"{indentation}{propertyInfo.Name} = {serializedValue}");
         }
+
+        sb.AppendLine(new string('\t', nestingLevel) + "}");
+        return sb.ToString();
+    }
+
+    private string SerializeProperty(PropertyInfo propertyInfo, object? obj, int nestingLevel, Dictionary<object?, int> parsedObjects)
+    {
+        var propertyValue = propertyInfo.GetValue(obj);
+
+        if (PropertySerializers.TryGetValue(propertyInfo, out var propertySerializer))
+        {
+            return propertySerializer(propertyValue);
+        }
+
+        if (TypeSerializers.TryGetValue(propertyInfo.PropertyType, out var typeSerializer))
+        {
+            return typeSerializer(propertyValue);
+        }
+
+        if (PropertiesMaxLength.TryGetValue(propertyInfo, out var maxLength) && propertyValue is string str)
+        {
+            return str[..Math.Min(str.Length, maxLength)];
+        }
+
+        return Cultures.TryGetValue(propertyInfo.PropertyType, out var culture)
+            ? Convert.ToString(propertyValue, culture) ?? "null"
+            : Serialize(propertyValue, nestingLevel, parsedObjects);
+    }
+
+    private static PropertyInfo GetProperty<TProperty>(Expression<Func<TOwner, TProperty>> memberSelector)
+    {
+        if (memberSelector.Body is not MemberExpression memberExpression)
+        {
+            throw new ArgumentException("Expression must refer to a property.");
+        }
+
+        return memberExpression.Member as PropertyInfo ?? throw new ArgumentException("Expression must refer to a property.");
     }
 }

ObjectPrinting/PropertyPrintingConfig.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Reflection;
+
+namespace ObjectPrinting
+{
+    public class PropertyPrintingConfig<TOwner, TProperty>(PrintingConfig<TOwner> config, PropertyInfo propertyInfo)
+    {
+        public PrintingConfig<TOwner> UseSerializer(Func<TProperty, string> serializer)
+        {
+            config.PropertySerializers[propertyInfo] = value => serializer((TProperty)value);
+            return config;
+        }
+
+        public PrintingConfig<TOwner> SetMaxLength(int maxLength)
+        {
+            config.PropertiesMaxLength[propertyInfo] = maxLength;
+            return config;
+        }
+    }
+}

ObjectPrinting/Tests/ObjectPrinterAcceptanceTests.cs

@@ -1,4 +1,6 @@
-using NUnit.Framework;
+using System;
+using System.Globalization;
+using NUnit.Framework;
 
 namespace ObjectPrinting.Tests
 {
@@ -10,18 +12,26 @@ public void Demo()
         {
             var person = new Person { Name = "Alex", Age = 19 };
 
-            var printer = ObjectPrinter.For<Person>();
+            var printer = ObjectPrinter.For<Person>()
                 //1. Исключить из сериализации свойства определенного типа
+                .Excluding<Guid>()
                 //2. Указать альтернативный способ сериализации для определенного типа
+                .For<int>().UseSerializer(i => i.ToString("X"))
                 //3. Для числовых типов указать культуру
+                .For<double>().SetCulture(CultureInfo.InvariantCulture)
                 //4. Настроить сериализацию конкретного свойства
                 //5. Настроить обрезание строковых свойств (метод должен быть виден только для строковых свойств)
+                .For(p => p.Name).SetMaxLength(10)
                 //6. Исключить из сериализации конкретного свойства
+                .Excluding(p => p.Age);
+
 
-            string s1 = printer.PrintToString(person);
+            var s1 = printer.PrintToString(person);
 
-            //7. Синтаксический сахар в виде метода расширения, сериализующего по-умолчанию        
+            //7. Синтаксический сахар в виде метода расширения, сериализующего по-умолчанию
+            var s2 = person.PrintToString();
             //8. ...с конфигурированием
+            var s3 = person.PrintToString(config => config);
         }
     }
 }