1/*
2 * [The "BSD licence"]
3 * Copyright (c) 2005-2008 Terence Parr
4 * All rights reserved.
5 *
6 * Conversion to C#:
7 * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33namespace Antlr.Runtime
34{
35    using Encoding = System.Text.Encoding;
36    using File = System.IO.File;
37
38    /** <summary>
39     *  This is a char buffer stream that is loaded from a file
40     *  all at once when you construct the object.  This looks very
41     *  much like an ANTLReader or ANTLRInputStream, but it's a special case
42     *  since we know the exact size of the object to load.  We can avoid lots
43     *  of data copying.
44     *  </summary>
45     */
46    [System.Serializable]
47    [System.Security.Permissions.FileIOPermission(System.Security.Permissions.SecurityAction.Demand, Unrestricted = true)]
48    public class ANTLRFileStream : ANTLRStringStream
49    {
50        protected string fileName;
51
52        public ANTLRFileStream( string fileName )
53            : this( fileName, null )
54        {
55        }
56
57        public ANTLRFileStream( string fileName, Encoding encoding )
58        {
59            this.fileName = fileName;
60            Load( fileName, encoding );
61        }
62
63        public virtual void Load( string fileName, Encoding encoding )
64        {
65            if ( fileName == null )
66            {
67                return;
68            }
69
70            string text;
71            if (encoding == null)
72                text = File.ReadAllText(fileName);
73            else
74                text = File.ReadAllText(fileName, encoding);
75
76            data = text.ToCharArray();
77            n = data.Length;
78        }
79
80        public override string SourceName
81        {
82            get
83            {
84                return fileName;
85            }
86        }
87    }
88}
89