1 files changed, 150 insertions, 0 deletions
diff --git a/runtime/CSharp2/Sources/Antlr3.Runtime/Antlr.Runtime/ANTLRFileStream.cs b/runtime/CSharp2/Sources/Antlr3.Runtime/Antlr.Runtime/ANTLRFileStream.cs
new file mode 100644
index 0000000..f66bbfc
--- /dev/null
+++ b/runtime/CSharp2/Sources/Antlr3.Runtime/Antlr.Runtime/ANTLRFileStream.cs
@@ -0,0 +1,150 @@
+/*
+[The "BSD licence"]
+Copyright (c) 2005-2007 Kunle Odutola
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code MUST RETAIN the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. 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.
+3. The name of the author may not be used to endorse or promote products
+   derived from this software without specific prior WRITTEN permission.
+4. Unless explicitly state otherwise, any contribution intentionally 
+   submitted for inclusion in this work to the copyright owner or licensor
+   shall be under the terms and conditions of this license, without any 
+   additional terms or conditions.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+*/
+
+
+namespace Antlr.Runtime
+{
+	using System;
+	using StreamReader	= System.IO.StreamReader;
+	using FileInfo		= System.IO.FileInfo;
+	using Encoding		= System.Text.Encoding;
+	
+	/// <summary>
+	/// A character stream - an <see cref="ICharStream"/> - that loads 
+	/// and caches the contents of it's underlying file fully during 
+	/// object construction
+	/// </summary>
+	/// <remarks>
+	/// This looks very much like an ANTLReaderStream or an ANTLRInputStream 
+	/// but, it is a special case. Since we know the exact size of the file to 
+	/// load, we can avoid lots of data copying and buffer resizing.
+	/// </remarks>
+	public class ANTLRFileStream : ANTLRStringStream
+	{
+		#region Constructors
+
+		/// <summary>
+		/// Initializes a new instance of the ANTLRFileStream class
+		/// </summary>
+		protected ANTLRFileStream()
+		{
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the ANTLRFileStream class for the
+		/// specified file name
+		/// </summary>
+		public ANTLRFileStream(string fileName) :
+			this(fileName, Encoding.Default)
+		{
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the ANTLRFileStream class for the
+		/// specified file name and encoding
+		/// </summary>
+		public ANTLRFileStream(string fileName, Encoding encoding)
+		{
+			this.fileName = fileName;
+			Load(fileName, encoding);
+		}
+
+		/// <summary>
+		/// Gets the file name of this ANTLRFileStream underlying file
+		/// </summary>
+		override public string SourceName
+		{
+			get { return fileName; }
+		}
+
+		#endregion
+
+
+		#region Public API
+
+		/// <summary>
+		/// Loads and buffers the specified file to be used as this 
+		/// ANTLRFileStream's source
+		/// </summary>
+		/// <param name="fileName">File to load</param>
+		/// <param name="encoding">Encoding to apply to file</param>
+		public virtual void Load(string fileName, Encoding encoding)
+		{
+			if (fileName == null)
+				return;
+
+			StreamReader fr = null;
+			try
+			{
+				FileInfo f = new FileInfo(fileName);
+				int filelen = (int)GetFileLength(f);
+				data = new char[filelen];
+				if (encoding != null)
+					fr = new StreamReader(fileName, encoding);
+				else
+					fr = new StreamReader(fileName, Encoding.Default);
+				n = fr.Read((Char[])data, 0, data.Length);
+			}
+			finally
+			{
+				if (fr != null)
+				{
+					fr.Close();
+				}
+			}
+		}
+
+		#endregion
+
+
+		#region Data Members
+
+		/// <summary>Fully qualified name of the stream's underlying file</summary>
+		protected string fileName;
+
+		#endregion
+
+
+		#region Private Members
+
+		private long GetFileLength(FileInfo file)
+		{
+			if (file.Exists)
+				return file.Length;
+			else
+				return 0;
+		}
+
+		#endregion
+	}
+}
+\ No newline at end of file