Add FileInfo / DirectoryInfo parser (#39)

Author: kutoga

README.md

@@ -520,8 +520,8 @@ namespace Example
 
 # 💡 Example: Parsing and validation
 There are already parsers for many data types implemented: all types of `int`, `char`, `bool`,
-`DateTime`, `DateTimeOffset`, `decimal`, `double`, `float`, `byte`, `Uri`, `string` (which is
-trivial) and enums
+`DateTime`, `DateTimeOffset`, `decimal`, `double`, `float`, `byte`, `Uri`, `FileInfo`,
+`DirectoryInfo`, `string` (which is trivial) and enums
 
 It might happen that you have to implement your own parser. It is always possible to define a
 parser to any definition. There are even cases where not every value in the parsed domain is

doc/README.md.template

@@ -185,8 +185,8 @@ A blocking example:
 
 # 💡 Example: Parsing and validation
 There are already parsers for many data types implemented: all types of `int`, `char`, `bool`,
-`DateTime`, `DateTimeOffset`, `decimal`, `double`, `float`, `byte`, `Uri`, `string` (which is
-trivial) and enums
+`DateTime`, `DateTimeOffset`, `decimal`, `double`, `float`, `byte`, `Uri`, `FileInfo`,
+`DirectoryInfo`, `string` (which is trivial) and enums
 
 It might happen that you have to implement your own parser. It is always possible to define a
 parser to any definition. There are even cases where not every value in the parsed domain is

source/FluentArgs.Test/Parsing/DefaultParserTests.cs

@@ -2,6 +2,7 @@
 {
     using System;
     using System.Collections.Generic;
+    using System.IO;
     using System.Threading.Tasks;
     using FluentAssertions;
     using Xunit;
@@ -294,6 +295,42 @@ public static void DefaultNullableUriParser_ShouldExist(string value)
                 .Should().Be(new Uri(value));
         }
 
+        [Theory]
+        [InlineData("file.txt")]
+        [InlineData("directory/file.txt")]
+        public static void DefaultFileInfoParser_ShouldExist(string value)
+        {
+            ParseValueWithDefaultParser<FileInfo>(value)
+                .Should().NotBeNull();
+        }
+
+        [Theory]
+        [InlineData("file.txt")]
+        [InlineData("directory/file.txt")]
+        public static void DefaultNullableFileInfoParser_ShouldExist(string value)
+        {
+            ParseValueWithDefaultParser<FileInfo?>(value)
+                .Should().NotBeNull();
+        }
+
+        [Theory]
+        [InlineData("./")]
+        [InlineData("directoryA/directoryB")]
+        public static void DefaultDirectoryInfoParser_ShouldExist(string value)
+        {
+            ParseValueWithDefaultParser<DirectoryInfo>(value)
+                .Should().NotBeNull();
+        }
+
+        [Theory]
+        [InlineData("./")]
+        [InlineData("directoryA/directoryB")]
+        public static void DefaultNullableDirectoryInfoParser_ShouldExist(string value)
+        {
+            ParseValueWithDefaultParser<DirectoryInfo?>(value)
+                .Should().NotBeNull();
+        }
+
         [Theory]
         [InlineData("")]
         [InlineData(" ")]

source/FluentArgs/Parser/DefaultStringParsers.cs

@@ -4,6 +4,7 @@
     using System.Collections.Generic;
     using System.Collections.Immutable;
     using System.Globalization;
+    using System.IO;
     using System.Linq;
 
     internal static class DefaultStringParsers
@@ -33,7 +34,10 @@ internal static class DefaultStringParsers
             [typeof(DateTimeOffset)] = s => DateTimeOffset.Parse(s, CultureInfo.InvariantCulture),
             [typeof(TimeSpan)] = s => TimeSpan.Parse(s, CultureInfo.InvariantCulture),
 
-            [typeof(Uri)] = s => new Uri(s)
+            [typeof(Uri)] = s => new Uri(s),
+
+            [typeof(FileInfo)] = s => new FileInfo(s),
+            [typeof(DirectoryInfo)] = s => new DirectoryInfo(s)
         };
 
         private delegate T ParseNumberFunc<out T>(string input);