Versioning Controlled Build

/*
 * Filename:    VersionStream.cs
 * Product:     Versioning Controlled Build
 * Solution:    BuildAutoIncrement
 * Project:     Shared
 * Description: Base class for concrete version streams.
 * Copyright:   Julijan �ribar, 2004-2010
 * 
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the author(s) be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */
using System;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;

namespace BuildAutoIncrement {
	/// <summary>
	///   Base class for concrete version streams: <c>AssemblyInfoStream</c>,
	///   <c>ResourceFileStream</c> and <c>SetupVersionStream</c>.
	/// </summary>
    public abstract class VersionStream {

        protected VersionStream() {
            m_filename = "";
        }

        public VersionStream(string filename) : this() {
            Debug.Assert(filename != null && File.Exists(filename));
            m_filename = filename;
            m_fileContent = FileUtil.ReadTextFile(filename, out m_encoding);
            Debug.Assert(m_fileContent.Length > 0);
        }

        public string Filename {
            get { return m_filename; }
        }

        protected ProjectVersion GetVersion(AssemblyVersionType versionType) {
            Debug.Assert(versionType != AssemblyVersionType.All);
            string assemblyVersionString = GetVersionString(versionType);
            if (assemblyVersionString.Length == 0)
                return ProjectVersion.Empty;
            Regex regex = new Regex(VersionPattern);
            Match match = regex.Match(assemblyVersionString);
            if (match.Length > 0) {
                return new ProjectVersion(match.Value, versionType);
            }
            regex = new Regex(QuotesEnclosedPattern);
            match = regex.Match(assemblyVersionString);
            return new ProjectVersion(match.ToString().Trim('\"'), versionType);
        }

        public abstract     AssemblyVersions GetVersions();

        protected abstract  string GetVersionString(AssemblyVersionType versionType);

        public abstract     void SaveVersion(AssemblyVersionType typeToSave, string newVersion);

        protected           string m_fileContent;

        protected           string m_filename;

        protected           Encoding m_encoding;
        
        protected abstract  string VersionPattern { get; }

        protected const     string StartOfLine                  = "^\\s*";
        protected const     string OneOrMoreWhitespacePattern   = "\\s+";
        protected const     string OptionalWhitespacePattern    = "\\s*";
        protected const     string QuotesEnclosedPattern        = "\"(?>[^\"]+)*\"";

	}
}