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150 lines
4.2 KiB
150 lines
4.2 KiB
/*
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[The "BSD licence"]
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Copyright (c) 2005-2007 Kunle Odutola
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code MUST RETAIN the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form MUST REPRODUCE the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior WRITTEN permission.
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4. Unless explicitly state otherwise, any contribution intentionally
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submitted for inclusion in this work to the copyright owner or licensor
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shall be under the terms and conditions of this license, without any
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additional terms or conditions.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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namespace Antlr.Runtime
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{
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using System;
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using StreamReader = System.IO.StreamReader;
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using FileInfo = System.IO.FileInfo;
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using Encoding = System.Text.Encoding;
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/// <summary>
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/// A character stream - an <see cref="ICharStream"/> - that loads
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/// and caches the contents of it's underlying file fully during
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/// object construction
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/// </summary>
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/// <remarks>
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/// This looks very much like an ANTLReaderStream or an ANTLRInputStream
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/// but, it is a special case. Since we know the exact size of the file to
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/// load, we can avoid lots of data copying and buffer resizing.
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/// </remarks>
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public class ANTLRFileStream : ANTLRStringStream
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{
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#region Constructors
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/// <summary>
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/// Initializes a new instance of the ANTLRFileStream class
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/// </summary>
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protected ANTLRFileStream()
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{
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}
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/// <summary>
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/// Initializes a new instance of the ANTLRFileStream class for the
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/// specified file name
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/// </summary>
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public ANTLRFileStream(string fileName) :
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this(fileName, Encoding.Default)
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{
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}
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/// <summary>
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/// Initializes a new instance of the ANTLRFileStream class for the
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/// specified file name and encoding
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/// </summary>
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public ANTLRFileStream(string fileName, Encoding encoding)
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{
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this.fileName = fileName;
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Load(fileName, encoding);
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}
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/// <summary>
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/// Gets the file name of this ANTLRFileStream underlying file
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/// </summary>
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override public string SourceName
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{
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get { return fileName; }
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}
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#endregion
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#region Public API
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/// <summary>
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/// Loads and buffers the specified file to be used as this
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/// ANTLRFileStream's source
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/// </summary>
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/// <param name="fileName">File to load</param>
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/// <param name="encoding">Encoding to apply to file</param>
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public virtual void Load(string fileName, Encoding encoding)
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{
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if (fileName == null)
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return;
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StreamReader fr = null;
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try
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{
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FileInfo f = new FileInfo(fileName);
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int filelen = (int)GetFileLength(f);
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data = new char[filelen];
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if (encoding != null)
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fr = new StreamReader(fileName, encoding);
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else
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fr = new StreamReader(fileName, Encoding.Default);
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n = fr.Read((Char[])data, 0, data.Length);
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}
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finally
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{
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if (fr != null)
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{
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fr.Close();
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}
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}
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}
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#endregion
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#region Data Members
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/// <summary>Fully qualified name of the stream's underlying file</summary>
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protected string fileName;
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#endregion
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#region Private Members
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private long GetFileLength(FileInfo file)
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{
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if (file.Exists)
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return file.Length;
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else
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return 0;
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}
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#endregion
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}
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} |