Add net5.0 target framework

src/Spectre.Console/Extensions/StringExtensions.cs

@@ -1,3 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using Spectre.Console.Internal;
+using Spectre.Console.Rendering;
+
 namespace Spectre.Console
 {
     /// <summary>
@@ -5,6 +13,11 @@ namespace Spectre.Console
     /// </summary>
     public static class StringExtensions
     {
+        // Cache whether or not internally normalized line endings
+        // already are normalized. No reason to do yet another replace if it is.
+        private static readonly bool _alreadyNormalized
+            = Environment.NewLine.Equals("\n", StringComparison.OrdinalIgnoreCase);
+
         /// <summary>
         /// Escapes text so that it won’t be interpreted as markup.
         /// </summary>
@@ -18,8 +31,137 @@ namespace Spectre.Console
             }
 
             return text
-                .Replace("[", "[[")
-                .Replace("]", "]]");
+                .ReplaceExact("[", "[[")
+                .ReplaceExact("]", "]]");
+        }
+
+        internal static int CellLength(this string text, RenderContext context)
+        {
+            if (context is null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            return Cell.GetCellLength(context, text);
+        }
+
+        internal static string Capitalize(this string text, CultureInfo? culture = null)
+        {
+            if (text == null)
+            {
+                return string.Empty;
+            }
+
+            culture ??= CultureInfo.InvariantCulture;
+
+            if (text.Length > 0 && char.IsLower(text[0]))
+            {
+                text = string.Format(culture, "{0}{1}", char.ToUpper(text[0], culture), text.Substring(1));
+            }
+
+            return text;
+        }
+
+        internal static string NormalizeLineEndings(this string? text, bool native = false)
+        {
+            text = text?.ReplaceExact("\r\n", "\n");
+            text = text?.ReplaceExact("\r", string.Empty);
+            text ??= string.Empty;
+
+            if (native && !_alreadyNormalized)
+            {
+                text = text.ReplaceExact("\n", Environment.NewLine);
+            }
+
+            return text;
+        }
+
+        internal static string[] SplitLines(this string text)
+        {
+            var result = text?.NormalizeLineEndings()?.Split(new[] { '\n' }, StringSplitOptions.None);
+            return result ?? Array.Empty<string>();
+        }
+
+        internal static string[] SplitWords(this string word, StringSplitOptions options = StringSplitOptions.None)
+        {
+            var result = new List<string>();
+
+            static string Read(StringBuffer reader, Func<char, bool> criteria)
+            {
+                var buffer = new StringBuilder();
+                while (!reader.Eof)
+                {
+                    var current = reader.Peek();
+                    if (!criteria(current))
+                    {
+                        break;
+                    }
+
+                    buffer.Append(reader.Read());
+                }
+
+                return buffer.ToString();
+            }
+
+            using (var reader = new StringBuffer(word))
+            {
+                while (!reader.Eof)
+                {
+                    var current = reader.Peek();
+                    if (char.IsWhiteSpace(current))
+                    {
+                        var x = Read(reader, c => char.IsWhiteSpace(c));
+                        if (options != StringSplitOptions.RemoveEmptyEntries)
+                        {
+                            result.Add(x);
+                        }
+                    }
+                    else
+                    {
+                        result.Add(Read(reader, c => !char.IsWhiteSpace(c)));
+                    }
+                }
+            }
+
+            return result.ToArray();
+        }
+
+        internal static string Repeat(this string text, int count)
+        {
+            if (text is null)
+            {
+                throw new ArgumentNullException(nameof(text));
+            }
+
+            if (count <= 0)
+            {
+                return string.Empty;
+            }
+
+            if (count == 1)
+            {
+                return text;
+            }
+
+            return string.Concat(Enumerable.Repeat(text, count));
+        }
+
+        internal static string ReplaceExact(this string text, string oldValue, string? newValue)
+        {
+#if NET5_0
+            return text.Replace(oldValue, newValue, StringComparison.Ordinal);
+#else
+            return text.Replace(oldValue, newValue);
+#endif
+        }
+
+        internal static bool ContainsExact(this string text, string value)
+        {
+#if NET5_0
+            return text.Contains(value, StringComparison.Ordinal);
+#else
+            return text.Contains(value);
+#endif
         }
     }
 }