MatchKitProject/Patterns/NewLinePattern.cs

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//=============================================================================
// System  : MatchKit
// File    : NewLinePattern.cs
// Author  : Fabio Bussu  (matchkit@fabiobussu.it)
// Updated : 04/16/2013
// Note    : Copyright 2013, Fabio Bussu, All rights reserved
//
// This code is published under the Microsoft Public License (Ms-PL). A copy
// of the license should be distributed with the code.  It can also be found
// at the project website: http://matchkit.codeplex.com. This notice, the
// author's name, and all copyright notices must remain intact in all
// applications, documentation, and source files.
//
// Version     Date     Who  Comments
// ============================================================================
// 1.0.0.0  04/16/2013   FB  First draft
//=============================================================================
using System;
using System.Runtime.Serialization;

namespace MatchKit.Patterns
{
	/// <summary>
	/// Provides the logic to match a new line, composed as a single CR (\r), a single LF (\n) or a 
	/// CRLF (\r\n).
	/// </summary>
	/// <threadsafety static="true" instance="false" />
	/// <serialization binary="true" contract="true" />
	/// <conceptualLink target="cb785773-b793-4cc4-acc4-6688cdb22696" />
	/// <conceptualLink target="0a06b2a9-5f58-409a-ba62-639cfd77bca7" />
	#if DC
	[DataContract]
	#endif
	#if SZ
	[Serializable]
	#endif
	public sealed class NewLinePattern : BasePattern
	{
		/// <inheritdoc />
		protected override Match OnMatch(MatchContext context)
		{
			var ch = context.Current;

			if (ch == '\r')
			{
				if (context.Peek('\n'))
				{
					context.NextFor(2);
					return Success(context, "\r\n");
				}
				else
				{
					context.NextCharacter();
					return Success(context, "\r");
				}
			}
			else if (ch == '\n')
			{
				context.NextCharacter();
				return Success(context, "\n");