Token.cs

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// 
// Copyright (c) 2013-2017 Carsten Sonne Larsen <cs@innolan.net>
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;

namespace Ntp.Analyzer.Config.Table
{
    public abstract class Token
    {
        public static Token Whitespace = new SymbolToken(Symbol.WhiteSpace, " ");

        public static Token NewLine = new SymbolToken(Symbol.NewLine, Environment.NewLine);

        public static Token EndOfFile = new SymbolToken(Symbol.EndOfFile);

        public static Token Undefined = new SymbolToken(Symbol.Undefined);

        public bool IsText => TokenType == TokenType.QuotedIdent ||
                              TokenType == TokenType.Literal ||
                              TokenType == TokenType.Keyword;

        public abstract TokenType TokenType { get; }

        public abstract Symbol Symbol { get; }

        public abstract string Text { get; }
    }
}