using System;
using System.Collections;
using System.Linq;
using System.Text.RegularExpressions;
 
namespace SEP.Extensions
{
    public static class InspectExtensions
    {
        public static string Inspect(this object obj)
        {
            return Inspect(obj, d => d.Inspect(), e => e.Inspect(), o => InspectWithProperties(o));
        }
 
        public static string Inspect(this char o)
        {
            return "'" + o + "'";
        }
 
        public static string Inspect(this string o)
        {
            if (o == null) return Inspect((object)o);
            return "\"" + o + "\"";
        }
 
        public static string Inspect(this IDictionary o)
        {
            if (o == null) return Inspect((object)o);
            var entries = o.Keys.Cast<object>().Select(key => InspectSimple(key) + " => " + InspectSimple(o[key]));
            return "{" + String.Join(", ", entries.ToArray()) + "}";
        }
 
        public static string Inspect(this IEnumerable o)
        {
            if (o == null) return Inspect((object)o);
            return "[" + String.Join(", ", o.Cast<object>().Select(obj => InspectSimple(obj)).ToArray()) + "]";
        }
 
        private static string InspectWithProperties(object o)
        {
            var inspected = "#<";
            inspected += InspectType(o.GetType());
            inspected += String.Join(",",
                                     o.GetType().GetProperties().Select(p => " " + p.Name + "=" + InspectSimple(p.GetValue(o, null)))
                                         .ToArray());
            inspected += ">";
            return inspected;
        }
 
        private static string InspectSimple(object obj)
        {
            return Inspect(obj, d => "{...}", e => "[...]",
                           o => "#<" + InspectType(o.GetType()) + ":0x" + o.GetHashCode().ToString("x") + ">");
        }
 
        private static string Inspect(object o,
            Func<IDictionary, string> inspectDictionary,
            Func<IEnumerable, string> inspectEnumerable,
            Func<object, string> inspectObject)
        {
            if (o == null) return "null";
            if (ShouldUseToString(o)) return o.ToString();
            if (o is Enum) return o.ToString().Replace(", ", "|");
            if (o is String) return ((String) o).Inspect();
            if (o is char) return ((char) o).Inspect();
            if (CanInspect(o)) return CallInspect(o);
            if (o is IDictionary) return inspectDictionary((IDictionary) o);
            if (o is IEnumerable) return inspectEnumerable((IEnumerable)o);
            return inspectObject(o);
        }
 
        private static bool ShouldUseToString(object o)
        {
            return o is int ||
                   o is long ||
                   o is float ||
                   o is double ||
                   o is decimal ||
                   o is byte ||
                   o is DateTime;
        }
 
        private static bool CanInspect(object o)
        {
            var inspectMethod = o.GetType().GetMethod("Inspect", new Type[0]);
            return inspectMethod != null && inspectMethod.ReturnType == typeof (String);
        }
 
        private static string CallInspect(object o)
        {
            var inspectMethod = o.GetType().GetMethod("Inspect", new Type[0]);
            return (string) inspectMethod.Invoke(o, null);
        }
 
        private static string InspectType(Type type)
        {
            return IsAnonymousType(type) ? InspectAnonymousType(type) : type.IsGenericType ? InspectGenericType(type) : type.FullName;
        }
 
        private static bool IsAnonymousType(Type type)
        {
            return new Regex("^<>f__AnonymousType").IsMatch(type.FullName);
        }
 
        private static string InspectAnonymousType(Type type)
        {
            return "anon";
        }
 
        private static string InspectGenericType(Type type)
        {
            var name = Undecorate(type.FullName);
            name += "<";
            name += String.Join(",", type.GetGenericArguments().Select(t => InspectType(t)).ToArray());
            name += ">";
            return name;
        }
 
        private static string Undecorate(string genericTypeName)
        {
            var decorationMatcher = new Regex(@"`\d+\[\[[^\]]+\](,\[[^\]]+\])*\]");
            return decorationMatcher.Replace(genericTypeName, "");
        }
    }
}
 

using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using Microsoft.VisualStudio.TestTools.UnitTesting;
 
namespace SEP.Extensions.Tests
{
    [TestClass]
    public class InspectExtensionTests
    {
        [TestMethod]
        public void ShouldInspectNull()
        {
            object o = null;
            Assert.AreEqual("null", o.Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectBytes()
        {
            byte b = 0x80;
            Assert.AreEqual("128", b.Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectChars()
        {
            Assert.AreEqual("'a'", 'a'.Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectIntegers()
        {
            Assert.AreEqual("99", 99.Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectLongs()
        {
            Assert.AreEqual("9999", 9999L.Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectStrings()
        {
            Assert.AreEqual("\"hello!\"", "hello!".Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectFloats()
        {
            Assert.AreEqual("1.5", 1.5F.Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectDoubles()
        {
            Assert.AreEqual("1.5", 1.5.Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectDecimals()
        {
            Assert.AreEqual("1.5", new Decimal(1.5).Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectDateTime()
        {
            Assert.AreEqual("1/1/2009 12:00:00 AM", new DateTime(2009, 1, 1).Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectStringPretendingToBeAnObject()
        {
            object o = "hello!";
            Assert.AreEqual("\"hello!\"", o.Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectArray()
        {
            Assert.AreEqual("[1, 2, 3]", new object[] {1, 2, 3}.Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectList()
        {
            Assert.AreEqual("[1, 2, 3]", new List<object>() {1, 2, 3}.Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectDictionary()
        {
            var items = new Dictionary<string, int>() {{"key", 1}};
            Assert.AreEqual("{\"key\" => 1}", items.Inspect());
        }
 
        [TestMethod]
        public void ShouldReportProperties()
        {
            Assert.AreEqual("#<anon Name=\"Matt\", Level=4>", new {Name = "Matt", Level = 4}.Inspect());
        }
 
        [TestMethod]
        public void ShouldNotRecurseIntoItemsInList()
        {
            var list = new List<object>();
            list.Add(new List<string>());
            Assert.AreEqual("[[...]]", list.Inspect());
        }
 
        [TestMethod]
        public void ShouldNotRecurseIntoItemsInDictionary()
        {
            var dictionary = new Dictionary<string, object>();
            dictionary["test"] = new Dictionary<string, int>();
            AssertMatch("{\"test\" => {...}}",
                        dictionary.Inspect());
        }
 
        public class TestClass
        {
            public object Thing { get; set; }
            internal object InternalThing { get; set; }
            protected object ProtectedThing { get; set; }
            private object PrivateThing { get; set; }
        }
 
        [TestMethod]
        public void ShouldNotRecurseIntoItemsInObject()
        {
            var x = new TestClass();
            x.Thing = new TestClass();
            Assert.AreEqual(
                "#<SEP.Extensions.Tests.InspectExtensionTests+TestClass Thing=#<SEP.Extensions.Tests.InspectExtensionTests+TestClass:0x11a2ccb>>",
                x.Inspect());
        }
 
        public class TestGenericClass<T>
        {
        }
 
        [TestMethod]
        public void ShouldReportGenericTypes()
        {
            Assert.AreEqual("#<SEP.Extensions.Tests.InspectExtensionTests+TestGenericClass<System.Int32>>",
                            new TestGenericClass<int>().Inspect());
        }
 
        public class TestInspectableClass
        {
            public string Inspect()
            {
                return "inspection!";
            }
        }
 
        [TestMethod]
        public void ShouldInspectInspectable()
        {
            Assert.AreEqual("inspection!", new TestInspectableClass().Inspect());
        }
 
        [TestMethod]
        public void ShouldInspectInspectableInList()
        {
            var list = new List<object>();
            list.Add(new TestInspectableClass());
            Assert.AreEqual("[inspection!]", list.Inspect());
        }
 
        [Flags]
        public enum TestEnum
        {
            A = 0x01,
            B = 0x02,
            C = 0x04
        }
 
        [TestMethod]
        public void ShouldInspectEnum()
        {
            Assert.AreEqual("A|B", (TestEnum.A | TestEnum.B).Inspect());
        }
 
 
 
        private void AssertMatch(string expectedPattern, string actual)
        {
            AssertMatch(new Regex(expectedPattern), actual);
        }
 
        private void AssertMatch(Regex expectedRegex, string actual)
        {
            Assert.IsTrue(expectedRegex.IsMatch(actual), "Expected to match: <" + expectedRegex + "> but was <" + actual + ">");
        }
    }
}