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Romeo and Juliet

, 3 Dec 2011 CPOL
Making relationships first class citizens.
XTreePropertyGrid
Clifton.Tools.Strings
bin
Debug
Clifton.Tools.Strings.dll
Release
Xml Documentation
obj
Debug
Refactor
TempPE
Xml Documentation
TempPE
UnitTests
Clifton.Windows.Forms
bin
Debug
Clifton.Tools.Strings.dll
Clifton.Windows.Forms.dll
Release
obj
Debug
Refactor
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Properties
Resources
tv_minus.bmp
tv_plus.bmp
XmlTree
.svn
all-wcprops
entries
prop-base
props
text-base
INode.cs.svn-base
IXtreeNode.cs.svn-base
Node.cs.svn-base
NodeDef.cs.svn-base
NodeInstance.cs.svn-base
NodeMenuItem.cs.svn-base
PlaceholderInstance.cs.svn-base
Popup.cs.svn-base
RootNode.cs.svn-base
XtreeNodeController.cs.svn-base
tmp
prop-base
props
text-base
Myxaml 2.0
MyXaml.Core
bin
Debug
Clifton.Tools.Strings.dll
MyXaml.Core.dll
UnitTest.dll
Release
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doc
MyXamlCoreUnitTests
obj
Debug
Refactor
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Release
Xml Documentation
TempPE
MyXaml.WinForms
bin
Debug
Clifton.Tools.Strings.dll
MyXaml.Core.dll
MyXaml.WinForms.dll
UnitTest.dll
Release
Xml Documentation
obj
Debug
Refactor
TempPE
Xml Documentation
TempPE
ROPLib
bin
Debug
ROPLib.dll
XTreeInterfaces.dll
Release
obj
Debug
Refactor
TempPE
Properties
ROPLib.csproj.user
UnitTest
bin
Debug
UnitTest.dll
Release
Xml Documentation
obj
Debug
Refactor
TempPE
Xml Documentation
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UnitTest.csproj.user
XTreeIIDemo
bin
Debug
Clifton.Tools.Strings.dll
Clifton.Windows.Forms.dll
MyXaml.Core.dll
MyXaml.WinForms.dll
ROPLib.dll
schemaEditor.myxaml
UnitTest.dll
XTreeIIDemo.exe
XTreeIIDemo.vshost.exe
XTreeIIDemo.vshost.exe.manifest
XTreeInterfaces.dll
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XTreeInterfaces
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XTreeInterfaces.dll
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/*
Copyright (c) 2005, Marc Clifton
All rights reserved.

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 MyXaml 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.

*/

using System;
using System.Security.Cryptography;
using System.Text;

namespace Clifton.Tools.Strings
{
	/// <summary>
	/// Helpers for string manipulation.
	/// </summary>
	public static class StringHelpers
	{
		/// <summary>
		/// Left of the first occurance of c
		/// </summary>
		/// <param name="src">The source string.</param>
		/// <param name="c">Return everything to the left of this character.</param>
		/// <returns>String to the left of c, or the entire string.</returns>
		public static string LeftOf(string src, char c)
		{
			string ret=src;
			int idx=src.IndexOf(c);
			if (idx != -1)
			{
				ret=src.Substring(0, idx);
			}
			return ret;
		}

		/// <summary>
		/// Left of the n'th occurance of c.
		/// </summary>
		/// <param name="src">The source string.</param>
		/// <param name="c">Return everything to the left n'th occurance of this character.</param>
		/// <param name="n">The occurance.</param>
		/// <returns>String to the left of c, or the entire string if not found or n is 0.</returns>
		public static string LeftOf(string src, char c, int n)
		{
			string ret=src;
			int idx=-1;
			while (n > 0)
			{
				idx=src.IndexOf(c, idx+1);
				if (idx==-1)
				{
					break;
				}
				--n;
			}
			if (idx != -1)
			{
				ret=src.Substring(0, idx);
			}
			return ret;
		}

		/// <summary>
		/// Right of the first occurance of c
		/// </summary>
		/// <param name="src">The source string.</param>
		/// <param name="c">The search char.</param>
		/// <returns>Returns everything to the right of c, or an empty string if c is not found.</returns>
		public static string RightOf(string src, char c)
		{
			string ret=String.Empty;
			int idx=src.IndexOf(c);
			if (idx != -1)
			{
				ret=src.Substring(idx+1);
			}
			return ret;
		}

		/// <summary>
		/// Right of the n'th occurance of c
		/// </summary>
		/// <param name="src">The source string.</param>
		/// <param name="c">The search char.</param>
		/// <param name="n">The occurance.</param>
		/// <returns>Returns everything to the right of c, or an empty string if c is not found.</returns>
		public static string RightOf(string src, char c, int n)
		{
			string ret=String.Empty;
			int idx=-1;
			while (n > 0)
			{
				idx=src.IndexOf(c, idx+1);
				if (idx==-1)
				{
					break;
				}
				--n;
			}

			if (idx != -1)
			{
				ret=src.Substring(idx+1);
			}

			return ret;
		}

		/// <summary>
		/// Returns everything to the left of the righmost char c.
		/// </summary>
		/// <param name="src">The source string.</param>
		/// <param name="c">The search char.</param>
		/// <returns>Everything to the left of the rightmost char c, or the entire string.</returns>
		public static string LeftOfRightmostOf(string src, char c)
		{
			string ret=src;
			int idx=src.LastIndexOf(c);
			if (idx != -1)
			{
				ret=src.Substring(0, idx);
			}
			return ret;
		}

		/// <summary>
		/// Returns everything to the right of the rightmost char c.
		/// </summary>
		/// <param name="src">The source string.</param>
		/// <param name="c">The seach char.</param>
		/// <returns>Returns everything to the right of the rightmost search char, or an empty string.</returns>
		public static string RightOfRightmostOf(string src, char c)
		{
			string ret=String.Empty;
			int idx=src.LastIndexOf(c);
			if (idx != -1)
			{
				ret=src.Substring(idx+1);
			}
			return ret;
		}

		/// <summary>
		/// Returns everything between the start and end chars, exclusive.
		/// </summary>
		/// <param name="src">The source string.</param>
		/// <param name="start">The first char to find.</param>
		/// <param name="end">The end char to find.</param>
		/// <returns>The string between the start and stop chars, or an empty string if not found.</returns>
		public static string Between(string src, char start, char end)
		{
			string ret=String.Empty;
			int idxStart=src.IndexOf(start);
			if (idxStart != -1)
			{
				++idxStart;
				int idxEnd=src.IndexOf(end, idxStart);
				if (idxEnd != -1)
				{
					ret=src.Substring(idxStart, idxEnd-idxStart);
				}
			}
			return ret;
		}

		/// <summary>
		/// Returns the number of occurances of "find".
		/// </summary>
		/// <param name="src">The source string.</param>
		/// <param name="find">The search char.</param>
		/// <returns>The # of times the char occurs in the search string.</returns>
		public static int Count(string src, char find)
		{
			int ret=0;
			foreach(char s in src)
			{
				if (s==find)
				{
					++ret;
				}
			}
			return ret;
		}

		/// <summary>
		/// Returns the rightmost char in src.
		/// </summary>
		/// <param name="src">The source string.</param>
		/// <returns>The rightmost char, or '\0' if the source has zero length.</returns>
		public static char Rightmost(string src)
		{
			char c='\0';
			if (src.Length>0)
			{
				c=src[src.Length-1];
			}
			return c;
		}

		public static bool BeginsWith(string src, char c)
		{
			bool ret=false;

			if (src.Length > 0)
			{
				ret=src[0]==c;
			}

			return ret;
		}

		public static bool EndsWith(string src, char c)
		{
			bool ret=false;

			if (src.Length > 0)
			{
				ret=src[src.Length-1]==c;
			}

			return ret;
		}

		public static string EmptyStringAsNull(string src)
		{
			string ret = src;

			if (ret == String.Empty)
			{
				ret = null;
			}

			return ret;
		}

		public static bool IsNullOrEmpty(string src)
		{
			return ((src == null) || (src == String.Empty));
		}

		// Read about MD5 here: http://en.wikipedia.org/wiki/MD5
		public static string Hash(string src)
		{
			HashAlgorithm hashProvider = new MD5CryptoServiceProvider();
			byte[] bytes = Encoding.UTF8.GetBytes(src);
			byte[] encoded=hashProvider.ComputeHash(bytes);
			return Convert.ToBase64String(encoded);
		}
	}
}

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About the Author

Marc Clifton
United States United States
Marc is the creator of two open source projects, MyXaml, a declarative (XML) instantiation engine and the Advanced Unit Testing framework, and Interacx, a commercial n-tier RAD application suite.  Visit his website, www.marcclifton.com, where you will find many of his articles and his blog.

Marc lives in Philmont, NY.

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