xref: /external/antlr/antlr-3.4/runtime/CSharp2/Sources/Antlr3.Runtime/Antlr.Runtime/ANTLRInputStream.cs

/*
 * [The "BSD licence"]
 * Copyright (c) 2005-2008 Terence Parr
 * All rights reserved.
 *
 * Conversion to C#:
 * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
 * 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.
 *
 * 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 Encoding = System.Text.Encoding;
    using Stream = System.IO.Stream;
    using StreamReader = System.IO.StreamReader;

    /** <summary>
     *  A kind of ReaderStream that pulls from an InputStream.
     *  Useful for reading from stdin and specifying file encodings etc...
     *  </summary>
     */
    [System.Serializable]
    public class ANTLRInputStream : ANTLRReaderStream {
        public ANTLRInputStream(Stream input)
            : this(input, null) {
        }

        public ANTLRInputStream(Stream input, int size)
            : this(input, size, null) {
        }

        public ANTLRInputStream(Stream input, Encoding encoding)
            : this(input, InitialBufferSize, encoding) {
        }

        public ANTLRInputStream(Stream input, int size, Encoding encoding)
            : this(input, size, ReadBufferSize, encoding) {
        }

        public ANTLRInputStream(Stream input, int size, int readBufferSize, Encoding encoding)
            : base(GetStreamReader(input, encoding), size, readBufferSize) {
        }

        private static StreamReader GetStreamReader(Stream input, Encoding encoding) {
            if (encoding != null)
                return new StreamReader(input, encoding);
            return new StreamReader(input);
        }
    }
}