/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

#pragma once

#include "atn/LexerAction.h"
#include "atn/LexerActionType.h"

namespace antlr4 {
namespace atn {

  using antlr4::Lexer;

  /// <summary>
  /// Implements the {@code channel} lexer action by calling
  /// <seealso cref="Lexer#setChannel"/> with the assigned channel.
  ///
  /// @author Sam Harwell
  /// @since 4.2
  /// </summary>
  class ANTLR4CPP_PUBLIC LexerChannelAction final : public LexerAction {
  public:
    static bool is(const LexerAction &lexerAction) { return lexerAction.getActionType() == LexerActionType::CHANNEL; }

    static bool is(const LexerAction *lexerAction) { return lexerAction != nullptr && is(*lexerAction); }

    /// <summary>
    /// Constructs a new {@code channel} action with the specified channel value. </summary>
    /// <param name="channel"> The channel value to pass to <seealso cref="Lexer#setChannel"/>. </param>
    explicit LexerChannelAction(int channel);

    /// <summary>
    /// Gets the channel to use for the <seealso cref="Token"/> created by the lexer.
    /// </summary>
    /// <returns> The channel to use for the <seealso cref="Token"/> created by the lexer. </returns>
    int getChannel() const { return _channel; }

    /// <summary>
    /// {@inheritDoc}
    ///
    /// <para>This action is implemented by calling <seealso cref="Lexer#setChannel"/> with the
    /// value provided by <seealso cref="#getChannel"/>.</para>
    /// </summary>
    void execute(Lexer *lexer) const override;

    bool equals(const LexerAction &other) const override;
    std::string toString() const override;

  protected:
    size_t hashCodeImpl() const override;

  private:
    const int _channel;
  };

} // namespace atn
} // namespace antlr4