Fixes #263 Add huminization of collections

release_notes.md

@@ -1,6 +1,7 @@
 ###In Development
   - [#257](https://github.com/Mehdik/Humanizer/pull/257): Added German localisation for ToOrdinalWords and Ordinalize
   - [#261](https://github.com/Mehdik/Humanizer/pull/261): Added future dates to Portuguese - Brazil
+  - [#268](https://github.com/Mehdik/Humanizer/pull/268): Added humanization of collections
 
 [Commits](https://github.com/MehdiK/Humanizer/compare/v1.25.4...master)
 

src/Humanizer.Tests/ApiApprover/PublicApiApprovalTest.approve_public_api.approved.txt

@@ -63,8 +63,17 @@ public class CasingExtensions
     public string ApplyCase(string input, Humanizer.LetterCasing casing) { }
 }
 
+public class CollectionHumanizeExtensions
+{
+    public string Humanize(System.Collections.Generic.IEnumerable<> collection) { }
+    public string Humanize(System.Collections.Generic.IEnumerable<> collection, System.Func<, > displayFormatter) { }
+    public string Humanize(System.Collections.Generic.IEnumerable<> collection, string separator) { }
+    public string Humanize(System.Collections.Generic.IEnumerable<> collection, System.Func<, > displayFormatter, string separator) { }
+}
+
 public class Configurator
 {
+    public Humanizer.Configuration.LocaliserRegistry<Humanizer.Localisation.CollectionFormatters.ICollectionFormatter> CollectionFormatters { get; }
     public Humanizer.DateTimeHumanizeStrategy.IDateTimeHumanizeStrategy DateTimeHumanizeStrategy { get; set; }
     public Humanizer.Configuration.LocaliserRegistry<Humanizer.Localisation.Formatters.IFormatter> Formatters { get; }
     public Humanizer.Configuration.LocaliserRegistry<Humanizer.Localisation.NumberToWords.INumberToWordsConverter> NumberToWordsConverters { get; }
@@ -194,6 +203,14 @@ public enum LetterCasing
     value__,
 }
 
+public interface ICollectionFormatter
+{
+    string Humanize(System.Collections.Generic.IEnumerable<> collection);
+    string Humanize(System.Collections.Generic.IEnumerable<> collection, System.Func<, > objectFormatter);
+    string Humanize(System.Collections.Generic.IEnumerable<> collection, string separator);
+    string Humanize(System.Collections.Generic.IEnumerable<> collection, System.Func<, > objectFormatter, string separator);
+}
+
 public class DefaultFormatter
 {
     public DefaultFormatter() { }

src/Humanizer.Tests/CollectionHumanizeTests.cs

@@ -0,0 +1,108 @@
+using System.Collections.Generic;
+using Xunit;
+
+namespace Humanizer.Tests
+{
+    public class SomeClass
+    {
+        public string SomeString;
+        public int SomeInt;
+        public override string ToString()
+        {
+            return "ToString";
+        }
+    }
+
+    public class CollectionHumanizeTests : AmbientCulture
+    {
+        public CollectionHumanizeTests() : base("en") { }
+
+        private readonly List<SomeClass> _testCollection = new List<SomeClass>
+            {
+                new SomeClass
+                {
+                    SomeInt = 1,
+                    SomeString = "One"
+                },
+                new SomeClass
+                {
+                    SomeInt = 2,
+                    SomeString = "Two"
+                },
+                new SomeClass
+                {
+                    SomeInt = 3,
+                    SomeString = "Three"
+                }
+            };
+
+        [Fact]
+        public void HumanizeReturnsOnlyNameWhenCollectionContainsOneItem()
+        {
+            var collection = new List<string> { "A String" };
+
+            Assert.Equal("A String", collection.Humanize());
+        }
+
+        [Fact]
+        public void HumanizeUsesSeparatorWhenMoreThanOneItemIsInCollection()
+        {
+            var collection = new List<string>
+            {
+                "A String",
+                "Another String",
+            };
+
+            Assert.Equal("A String or Another String", collection.Humanize("or"));
+        }
+
+        [Fact]
+        public void HumanizeDefaultsSeparatorToAnd()
+        {
+            var collection = new List<string>
+            {
+                "A String",
+                "Another String",
+            };
+
+            Assert.Equal("A String and Another String", collection.Humanize());
+        }
+
+        [Fact]
+        public void HumanizeUsesOxfordComma()
+        {
+            var collection = new List<string>
+            {
+                "A String",
+                "Another String",
+                "A Third String",
+            };
+
+            Assert.Equal("A String, Another String, or A Third String", collection.Humanize("or"));
+        }
+
+        [Fact]
+        public void HumanizeDefaultsToToString()
+        {
+
+            Assert.Equal("ToString, ToString, or ToString", _testCollection.Humanize("or"));
+        }
+
+        [Fact]
+        public void HumanizeUsesObjectFormatter()
+        {
+
+            Assert.Equal("SomeObject #1 - One, SomeObject #2 - Two, and SomeObject #3 - Three",
+                         _testCollection.Humanize(sc => string.Format("SomeObject #{0} - {1}", sc.SomeInt, sc.SomeString)));
+        }
+
+        [Fact]
+        public void HumanizeUsesObjectFormatterWhenSeparatorIsProvided()
+        {
+
+            Assert.Equal("SomeObject #1 - One, SomeObject #2 - Two, or SomeObject #3 - Three",
+                         _testCollection.Humanize(sc => string.Format("SomeObject #{0} - {1}", sc.SomeInt, sc.SomeString),
+                                             "or"));
+        }
+    }
+}

src/Humanizer.Tests/Humanizer.Tests.csproj

@@ -62,6 +62,7 @@
     <Compile Include="Bytes\ToStringTests.cs" />
     <Compile Include="CasingTests.cs" />
     <Compile Include="DateHumanize.cs" />
+    <Compile Include="CollectionHumanizeTests.cs" />
     <Compile Include="Localisation\bg\DateHumanizeTests.cs" />
     <Compile Include="Localisation\bg\TimeSpanHumanizeTests.cs" />
     <Compile Include="Localisation\cs\DateHumanizeTests.cs" />
@@ -171,6 +172,7 @@
   <ItemGroup>
     <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
   </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.

src/Humanizer/CollectionHumanizeExtensions.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using Humanizer.Configuration;
+
+
+namespace Humanizer
+{
+    /// <summary>
+    /// Humanizes an IEnumerable into a human readable list
+    /// </summary>
+    public static class CollectionHumanizeExtensions
+    {
+        /// <summary>
+        /// Formats the collection for display, calling ToString() on each object and
+        /// using the default separator for the current culture.
+        /// </summary>
+        /// <returns></returns>
+        public static string Humanize<T>(this IEnumerable<T> collection)
+        {
+            return Configurator.CollectionFormatter.Humanize(collection);
+        }
+
+        /// <summary>
+        /// Formats the collection for display, calling `objectFormatter` on each object
+        /// and using the default separator for the current culture.
+        /// </summary>
+        /// <returns></returns>
+        public static string Humanize<T>(this IEnumerable<T> collection, Func<T, String> displayFormatter)
+        {
+            if (displayFormatter == null)
+                throw new ArgumentNullException("displayFormatter");
+
+            return Configurator.CollectionFormatter.Humanize(collection, displayFormatter);
+        }
+
+        /// <summary>
+        /// Formats the collection for display, calling ToString() on each object
+        /// and using the provided separator.
+        /// </summary>
+        /// <returns></returns>
+        public static string Humanize<T>(this IEnumerable<T> collection, String separator)
+        {
+
+            return Configurator.CollectionFormatter.Humanize(collection, separator);
+        }
+
+        /// <summary>
+        /// Formats the collection for display, calling `objectFormatter` on each object
+        /// and using the provided separator.
+        /// </summary>
+        /// <returns></returns>
+        public static string Humanize<T>(this IEnumerable<T> collection, Func<T, String> displayFormatter, String separator)
+        {
+            if (displayFormatter == null)
+                throw new ArgumentNullException("displayFormatter");
+
+            return Configurator.CollectionFormatter.Humanize(collection, displayFormatter, separator);
+        }
+    }
+}

src/Humanizer/Configuration/CollectionFormatterRegistry.cs

@@ -0,0 +1,13 @@
+using Humanizer.Localisation.CollectionFormatters;
+
+namespace Humanizer.Configuration
+{
+    internal class CollectionFormatterRegistry : LocaliserRegistry<ICollectionFormatter>
+    {
+        public CollectionFormatterRegistry()
+            : base(new DefaultCollectionFormatter())
+        {
+            Register<EnglishCollectionFormatter>("en");
+        }
+    }
+}

src/Humanizer/Configuration/Configurator.cs

@@ -2,6 +2,7 @@
 using Humanizer.Localisation.Formatters;
 using Humanizer.Localisation.NumberToWords;
 using Humanizer.Localisation.Ordinalizers;
+using Humanizer.Localisation.CollectionFormatters;
 
 namespace Humanizer.Configuration
 {
@@ -10,6 +11,16 @@ namespace Humanizer.Configuration
     /// </summary>
     public static class Configurator
     {
+        private static readonly LocaliserRegistry<ICollectionFormatter> _collectionFormatters = new CollectionFormatterRegistry();
+
+        /// <summary>
+        /// A registry of formatters used to format collections based on the current locale
+        /// </summary>
+        public static LocaliserRegistry<ICollectionFormatter> CollectionFormatters
+        {
+            get { return _collectionFormatters; }
+        }
+
         private static readonly LocaliserRegistry<IFormatter> _formatters = new FormatterRegistry();
         /// <summary>
         /// A registry of formatters used to format strings based on the current locale
@@ -36,6 +47,14 @@ public static LocaliserRegistry<IOrdinalizer> Ordinalizers
         {
             get { return _ordinalizers; }
         }
+
+        internal static ICollectionFormatter CollectionFormatter
+        {
+            get
+            {
+                return CollectionFormatters.ResolveForUiCulture();
+            }
+        }
 
         /// <summary>
         /// The formatter to be used

src/Humanizer/Humanizer.csproj

@@ -49,6 +49,11 @@
     <AssemblyOriginatorKeyFile>Humanizer.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
+    <Compile Include="CollectionHumanizeExtensions.cs" />
+    <Compile Include="Configuration\CollectionFormatterRegistry.cs" />
+    <Compile Include="Localisation\CollectionFormatters\DefaultCollectionFormatter.cs" />
+    <Compile Include="Localisation\CollectionFormatters\EnglishCollectionFormatter.cs" />
+    <Compile Include="Localisation\CollectionFormatters\ICollectionFormatter.cs" />
     <Compile Include="Localisation\Formatters\SerbianFormatter.cs" />
     <Compile Include="Localisation\Formatters\SlovenianFormatter.cs" />
     <Compile Include="Configuration\LocaliserRegistry.cs" />

src/Humanizer/Localisation/CollectionFormatters/DefaultCollectionFormatter.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+
+namespace Humanizer.Localisation.CollectionFormatters
+{
+    class DefaultCollectionFormatter : ICollectionFormatter
+    {
+        protected String DefaultSeparator = "";
+
+        public virtual string Humanize<T>(IEnumerable<T> collection)
+        {
+            return Humanize(collection, o => o.ToString(), DefaultSeparator);
+        }
+
+        public virtual string Humanize<T>(IEnumerable<T> collection, Func<T, String> objectFormatter)
+        {
+            return Humanize(collection, objectFormatter, DefaultSeparator);
+        }
+
+        public virtual string Humanize<T>(IEnumerable<T> collection, String separator)
+        {
+            return Humanize(collection, o => o.ToString(), separator);
+        }
+
+        public virtual string Humanize<T>(IEnumerable<T> collection, Func<T, String> objectFormatter, String separator)
+        {
+            throw new NotImplementedException("A collection formatter for the current culture has not been implemented yet.");
+        }
+    }
+}

src/Humanizer/Localisation/CollectionFormatters/EnglishCollectionFormatter.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Humanizer.Localisation.CollectionFormatters
+{
+    internal class EnglishCollectionFormatter : DefaultCollectionFormatter
+    {
+        public EnglishCollectionFormatter()
+        {
+            DefaultSeparator = "and";
+        }
+
+        public override string Humanize<T>(IEnumerable<T> collection, Func<T, String> objectFormatter, String separator)
+        {
+            if (collection == null)
+                throw new ArgumentException("collection");
+
+            var enumerable = collection as T[] ?? collection.ToArray();
+
+            int count = enumerable.Count();
+
+            if (count == 0)
+                return "";
+
+            if (count == 1)
+                return objectFormatter(enumerable.First());
+
+            string formatString = count > 2 ? "{0}, {1} {2}" : "{0} {1} {2}";
+
+            return String.Format(formatString,
+                                 String.Join(", ", enumerable.Take(count - 1).Select(objectFormatter)),
+                                 separator,
+                                 objectFormatter(enumerable.Skip(count - 1).First()));
+        }
+    }
+}

src/Humanizer/Localisation/CollectionFormatters/ICollectionFormatter.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+
+namespace Humanizer.Localisation.CollectionFormatters
+{
+    /// <summary>
+    /// An interface you should implement to localize Humanize for collections
+    /// </summary>
+    public interface ICollectionFormatter
+    {
+        /// <summary>
+        /// Formats the collection for display, calling ToString() on each object.
+        /// </summary>
+        /// <returns></returns>
+        String Humanize<T>(IEnumerable<T> collection);
+
+        /// <summary>
+        /// Formats the collection for display, calling `objectFormatter` on each object.
+        /// </summary>
+        /// <returns></returns>
+        String Humanize<T>(IEnumerable<T> collection, Func<T, String> objectFormatter);
+
+        /// <summary>
+        /// Formats the collection for display, calling ToString() on each object
+        /// and using `separator` before the final item.
+        /// </summary>
+        /// <returns></returns>
+        String Humanize<T>(IEnumerable<T> collection, String separator);
+
+        /// <summary>
+        /// Formats the collection for display, calling `objectFormatter` on each object
+        /// and using `separator` before the final item.
+        /// </summary>
+        /// <returns></returns>
+        String Humanize<T>(IEnumerable<T> collection, Func<T, String> objectFormatter, String separator);
+    }
+}