Squashed 'FSI.Lib/' content from commit 6aa4846

git-subtree-dir: FSI.Lib
git-subtree-split: 6aa48465a834a7bfdd9cbeae8d2e4f769d0c0ff8

FSI.Lib/WinSettings/ArrayToString.cs

@@ -0,0 +1,90 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace FSI.Lib.WinSettings
+{
+    internal static class ArrayToString
+    {
+        /// <summary>
+        /// Represents the given array as a single string.
+        /// </summary>
+        /// <param name="array">String array to encode.</param>
+        /// <returns>The encoded string.</returns>
+        public static string Encode(string[] array)
+        {
+            StringBuilder builder = new StringBuilder();
+
+            if (array == null)
+                return string.Empty;
+
+            for (int i = 0; i < array.Length; i++)
+            {
+                if (i > 0)
+                    builder.Append(',');
+                if (array[i].IndexOfAny(new[] { ',', '"', '\r', '\n' }) >= 0)
+                    builder.Append(string.Format("\"{0}\"", array[i].Replace("\"", "\"\"")));
+                else
+                    builder.Append(array[i]);
+            }
+            return builder.ToString();
+        }
+
+        /// <summary>
+        /// Decodes a string created with <see cref="Encode"></see> back to an array.
+        /// </summary>
+        /// <param name="s">String to decode.</param>
+        /// <returns>The decoded array.</returns>
+        public static string[] Decode(string s)
+        {
+            List<string> list = new List<string>();
+            int pos = 0;
+
+            if (s == null)
+                return Array.Empty<string>();
+
+            while (pos < s.Length)
+            {
+                if (s[pos] == '\"')
+                {
+                    // Parse quoted value
+                    StringBuilder builder = new StringBuilder();
+
+                    // Skip starting quote
+                    pos++;
+                    while (pos < s.Length)
+                    {
+                        if (s[pos] == '"')
+                        {
+                            // Skip quote
+                            pos++;
+                            // One quote signifies end of value
+                            // Two quote signifies single quote literal
+                            if (pos >= s.Length || s[pos] != '"')
+                                break;
+                        }
+                        builder.Append(s[pos++]);
+                    }
+                    list.Add(builder.ToString());
+                    // Skip delimiter
+                    pos = s.IndexOf(',', pos);
+                    if (pos == -1)
+                        pos = s.Length;
+                    pos++;
+                }
+                else
+                {
+                    // Parse value
+                    int start = pos;
+                    pos = s.IndexOf(',', pos);
+                    if (pos == -1)
+                        pos = s.Length;
+                    list.Add(s.Substring(start, pos - start));
+                    // Skip delimiter
+                    pos++;
+                }
+            }
+            return list.ToArray();
+        }
+    }
+}