/*
 * [The "BSD license"]
 *  Copyright (c) 2013 Terence Parr
 *  Copyright (c) 2013 Sam Harwell
 *  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.
 */
using System;
using Antlr4.Runtime;
using Antlr4.Runtime.Misc;
using Sharpen;

namespace Antlr4.Runtime
{
    public class CommonTokenFactory : ITokenFactory
    {
        public static readonly ITokenFactory Default = new Antlr4.Runtime.CommonTokenFactory
            ();

        /// <summary>Copy text for token out of input char stream.</summary>
        /// <remarks>
        /// Copy text for token out of input char stream. Useful when input
        /// stream is unbuffered.
        /// </remarks>
        /// <seealso cref="UnbufferedCharStream">UnbufferedCharStream</seealso>
        protected internal readonly bool copyText;

        /// <summary>
        /// Create factory and indicate whether or not the factory copy
        /// text out of the char stream.
        /// </summary>
        /// <remarks>
        /// Create factory and indicate whether or not the factory copy
        /// text out of the char stream.
        /// </remarks>
        public CommonTokenFactory(bool copyText)
        {
            this.copyText = copyText;
        }

        public CommonTokenFactory() : this(false)
        {
        }

        public virtual CommonToken Create<_T0>(Tuple<_T0> source, int type, string text, 
            int channel, int start, int stop, int line, int charPositionInLine) where _T0:
            ITokenSource
        {
            CommonToken t = new CommonToken(source, type, channel, start, stop);
            t.Line = line;
            t.Column = charPositionInLine;
            if (text != null)
            {
                t.Text = text;
            }
            else
            {
                if (copyText && source.GetItem2() != null)
                {
                    t.Text = source.GetItem2().GetText(Interval.Of(start, stop));
                }
            }
            return t;
        }

        public virtual CommonToken Create(int type, string text)
        {
            return new CommonToken(type, text);
        }
    }
}