1 files changed, 140 insertions, 0 deletions
diff --git a/csharp/src/ProtocolBuffers/NameHelpers.cs b/csharp/src/ProtocolBuffers/NameHelpers.cs
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+++ b/csharp/src/ProtocolBuffers/NameHelpers.cs
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+#region Copyright notice and license
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://github.com/jskeet/dotnet-protobufs/
+// Original C++/Java/Python code:
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Text.RegularExpressions;
+
+namespace Google.ProtocolBuffers
+{
+    /// <summary>
+    /// Helpers for converting names to pascal case etc.
+    /// </summary>
+    public class NameHelpers
+    {
+        /// <summary>
+        /// All characters that are not alpha-numeric
+        /// </summary>
+        private static readonly Regex NonAlphaNumericCharacters = new Regex(@"[^a-zA-Z0-9]+");
+
+        /// <summary>
+        /// Matches lower-case character that follow either an underscore, or a number
+        /// </summary>
+        private static readonly Regex UnderscoreOrNumberWithLowerCase = new Regex(@"[0-9_][a-z]");
+
+        /// <summary>
+        /// Removes non alpha numeric characters while capitalizing letters that follow
+        /// a number or underscore.  The first letter is always upper case.
+        /// </summary>
+        public static string UnderscoresToPascalCase(string input)
+        {
+            string name = UnderscoresToUpperCase(input);
+
+            // Pascal case always begins with upper-case letter
+            if (Char.IsLower(name[0]))
+            {
+                char[] chars = name.ToCharArray();
+                chars[0] = char.ToUpper(chars[0]);
+                return new string(chars);
+            }
+            return name;
+        }
+
+        /// <summary>
+        /// Removes non alpha numeric characters while capitalizing letters that follow
+        /// a number or underscore.  The first letter is always lower case.
+        /// </summary>
+        public static string UnderscoresToCamelCase(string input)
+        {
+            string name = UnderscoresToUpperCase(input);
+
+            // Camel case always begins with lower-case letter
+            if (Char.IsUpper(name[0]))
+            {
+                char[] chars = name.ToCharArray();
+                chars[0] = char.ToLower(chars[0]);
+                return new string(chars);
+            }
+            return name;
+        }
+
+        /// <summary>
+        /// Capitalizes any characters following an '_' or a number '0' - '9' and removes
+        /// all non alpha-numeric characters.  If the resulting string begins with a number
+        /// an '_' will be prefixed.  
+        /// </summary>
+        private static string UnderscoresToUpperCase(string input)
+        {
+            string name = UnderscoreOrNumberWithLowerCase.Replace(input, x => x.Value.ToUpper());
+            name = NonAlphaNumericCharacters.Replace(name, String.Empty);
+
+            if (name.Length == 0)
+            {
+                throw new ArgumentException(String.Format("The field name '{0}' is invalid.", input));
+            }
+
+            // Fields can not start with a number
+            if (Char.IsNumber(name[0]))
+            {
+                name = '_' + name;
+            }
+
+            return name;
+        }
+
+        internal static string StripProto(string text)
+        {
+            if (!StripSuffix(ref text, ".protodevel"))
+            {
+                StripSuffix(ref text, ".proto");
+            }
+            return text;
+        }
+
+        /// <summary>
+        /// Attempts to strip a suffix from a string, returning whether
+        /// or not the suffix was actually present.
+        /// </summary>
+        public static bool StripSuffix(ref string text, string suffix)
+        {
+            if (text.EndsWith(suffix))
+            {
+                text = text.Substring(0, text.Length - suffix.Length);
+                return true;
+            }
+            return false;
+        }
+    }
+}
+\ No newline at end of file