// This file is part of YamlDotNet - A .NET library for YAML.
// Copyright (c) Antoine Aubry and contributors
//
// 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 YamlDotNet.Core.Tokens;

namespace YamlDotNet.Core
{
    /// <summary>
    /// Defines the interface for a stand-alone YAML scanner that
    /// converts a sequence of characters into a sequence of YAML tokens.
    /// </summary>
    public interface IScanner
    {
        /// <summary>
        /// Gets the current position inside the input stream.
        /// </summary>
        /// <value>The current position.</value>
        Mark CurrentPosition { get; }

        /// <summary>
        /// Gets the current token.
        /// </summary>
        Token? Current { get; }

        /// <summary>
        /// Moves to the next token and consumes the current token.
        /// </summary>
        bool MoveNext();

        /// <summary>
        /// Moves to the next token without consuming the current token.
        /// </summary>
        bool MoveNextWithoutConsuming();

        /// <summary>
        /// Consumes the current token.
        /// </summary>
        void ConsumeCurrent();
    }
}