#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.Globalization;
using System.Text;
using System.Text.RegularExpressions;
namespace Google.ProtocolBuffers
{
/// <summary>
/// Helpers for converting names to pascal case etc.
/// </summary>
public class NameHelpers
{
public static string UnderscoresToPascalCase(string input)
{
return UnderscoresToPascalOrCamelCase(input, true);
}
public static string UnderscoresToCamelCase(string input)
{
return UnderscoresToPascalOrCamelCase(input, false);
}
/// <summary>
/// Converts a string to Pascal or Camel case. The first letter is capitalized or
/// lower-cased depending on <paramref name="pascal"/> is true.
/// After the first letter, any punctuation is removed but triggers capitalization
/// of the next letter. Digits are preserved but trigger capitalization of the next
/// letter.
/// All capitalisation is done in the invariant culture.
/// </summary>
private static string UnderscoresToPascalOrCamelCase(string input, bool pascal)
{
string name = Transform(input, pascal ? UnderlineToPascal : UnderlineToCamel, x => x.Value.TrimStart('_').ToUpper());
if (name.Length == 0)
throw new ArgumentException(String.Format("The field name '{0}' is invalid.", input));
// Pascal case always begins with lower-case letter
if (!pascal && Char.IsUpper(name[0]))
{
char[] chars = name.ToCharArray();
chars[0] = char.ToLower(chars[0]);
return new string(chars);
}
// 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;
}
/// <summary>
/// Similar to UnderlineToCamel, but also matches the first character if it is lower-case
/// </summary>
private static Regex UnderlineToPascal = new Regex(@"(?:(?:^|[0-9_])[a-z])|_");
/// <summary>
/// Matches lower-case character that follow either an underscore, or a number
/// </summary>
private static Regex UnderlineToCamel = new Regex(@"(?:[0-9_][a-z])|_");
/// <summary>
/// Used for text-template transformation where a regex match is replaced in the input string.
/// </summary>
/// <param name="input">The text to perform the replacement upon</param>
/// <param name="pattern">The regex used to perform the match</param>
/// <param name="fnReplace">A delegate that selects the appropriate replacement text</param>
/// <returns>The newly formed text after all replacements are made</returns>
/// <remarks>
/// Originally found at http://csharptest.net/browse/src/Library/Utils/StringUtils.cs#120
/// Republished here by the original author under this project's licensing.
/// </remarks>
private static string Transform(string input, Regex pattern, Converter<Match, string> fnReplace)
{
int currIx = 0;
StringBuilder sb = new StringBuilder();
foreach (Match match in pattern.Matches(input))
{
sb.Append(input, currIx, match.Index - currIx);
string replace = fnReplace(match);
sb.Append(replace);
currIx = match.Index + match.Length;
}
sb.Append(input, currIx, input.Length - currIx);
return sb.ToString();
}
}
}