feat: Added SingleLineString

ValueTransformers-Test/SingleLineString.cs

@@ -0,0 +1,60 @@
+/*******************************************************************************
+ * The MIT License (MIT)
+ * 
+ * Copyright (c) 2021 DigiDNA - www.imazing.com
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ ******************************************************************************/
+
+using System;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace ValueTransformers_Test
+{
+    [ TestClass ]
+    public class SingleLineString
+    {
+        private readonly ValueTransformers.SingleLineString Converter = new ValueTransformers.SingleLineString();
+
+        [ TestMethod ]
+        public void TestNull()
+        {
+            Assert.IsNull( this.Converter.Convert( null, typeof( string ), null, null ) );
+        }
+
+        [ TestMethod ]
+        public void TestEmptyString()
+        {
+            Assert.AreEqual( this.Converter.Convert( "", typeof( string ), null, null ), "" );
+        }
+
+        [ TestMethod ]
+        public void TestString()
+        {
+            Assert.AreEqual( this.Converter.Convert( "hello, world",                 typeof( string ), null, null ), "hello, world" );
+            Assert.AreEqual( this.Converter.Convert( "hello, world\nhello universe", typeof( string ), null, null ), "hello, world" );
+        }
+
+        [ TestMethod ]
+        public void TestNonString()
+        {
+            Assert.IsNull( this.Converter.Convert( 42, typeof( string ), null, null ) );
+        }
+    }
+}

ValueTransformers/Converters/SingleLineString.cs

@@ -0,0 +1,59 @@
+/*******************************************************************************
+ * The MIT License (MIT)
+ * 
+ * Copyright (c) 2021 DigiDNA - www.imazing.com
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ ******************************************************************************/
+
+using System;
+using System.Windows.Data;
+using System.Windows.Markup;
+
+namespace ValueTransformers
+{
+    [ MarkupExtensionReturnType( typeof( IValueConverter ) ) ]
+    [ ValueConversion( typeof( object ), typeof( string ) ) ]
+    public class SingleLineString: MarkupExtension, IValueConverter
+    {
+        public object? Convert( object? value, Type targetType, object? parameter, System.Globalization.CultureInfo? culture )
+        {
+            if( !( value is string str ) )
+            {
+                return null;
+            }
+
+            string[] lines = str.Split( '\n' );
+
+            return ( lines.Length > 0 ) ? lines[ 0 ] : null;
+        }
+
+        public object? ConvertBack( object? value, Type targetType, object? parameter, System.Globalization.CultureInfo? culture )
+        {
+            throw new NotSupportedException();
+        }
+
+        private static readonly Lazy< SingleLineString > Converter = new Lazy< SingleLineString >( () => new SingleLineString() );
+
+        public override object ProvideValue( IServiceProvider serviceProvider )
+        {
+            return Converter.Value;
+        }
+    }
+}