//===-- SBCommandInterpreter.h ----------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef LLDB_API_SBCOMMANDINTERPRETER_H
#define LLDB_API_SBCOMMANDINTERPRETER_H

#include <memory>

#include "lldb/API/SBDebugger.h"
#include "lldb/API/SBDefines.h"
#include "lldb/API/SBStructuredData.h"

namespace lldb_private {
class CommandPluginInterfaceImplementation;
}

namespace lldb {

class SBCommandInterpreter {
public:
  enum {
    eBroadcastBitThreadShouldExit = (1 << 0),
    eBroadcastBitResetPrompt = (1 << 1),
    eBroadcastBitQuitCommandReceived = (1 << 2), // User entered quit
    eBroadcastBitAsynchronousOutputData = (1 << 3),
    eBroadcastBitAsynchronousErrorData = (1 << 4)
  };

  SBCommandInterpreter();
  SBCommandInterpreter(const lldb::SBCommandInterpreter &rhs);

  ~SBCommandInterpreter();

  const lldb::SBCommandInterpreter &
  operator=(const lldb::SBCommandInterpreter &rhs);

  static const char *
  GetArgumentTypeAsCString(const lldb::CommandArgumentType arg_type);

  static const char *
  GetArgumentDescriptionAsCString(const lldb::CommandArgumentType arg_type);

  static bool EventIsCommandInterpreterEvent(const lldb::SBEvent &event);

  explicit operator bool() const;

  bool IsValid() const;

  /// Return whether a built-in command with the passed in
  /// name or command path exists.
  ///
  /// \param[in] cmd
  ///   The command or command path to search for.
  ///
  /// \return
  ///   \b true if the command exists, \b false otherwise.
  bool CommandExists(const char *cmd);

  /// Return whether a user defined command with the passed in
  /// name or command path exists.
  ///
  /// \param[in] cmd
  ///   The command or command path to search for.
  ///
  /// \return
  ///   \b true if the command exists, \b false otherwise.
  bool UserCommandExists(const char *cmd);

  /// Return whether the passed in name or command path
  /// exists and is an alias to some other command.
  ///
  /// \param[in] cmd
  ///   The command or command path to search for.
  ///
  /// \return
  ///   \b true if the command exists, \b false otherwise.
  bool AliasExists(const char *cmd);

  lldb::SBBroadcaster GetBroadcaster();

  static const char *GetBroadcasterClass();

  bool HasCommands();

  bool HasAliases();

  bool HasAliasOptions();

  bool IsInteractive();

  lldb::SBProcess GetProcess();

  lldb::SBDebugger GetDebugger();

#ifndef SWIG
  lldb::SBCommand AddMultiwordCommand(const char *name, const char *help);

  /// Add a new command to the lldb::CommandInterpreter.
  ///
  /// The new command won't support autorepeat. If you need this functionality,
  /// use the override of this function that accepts the \a auto_repeat_command
  /// parameter.
  ///
  /// \param[in] name
  ///     The name of the command.
  ///
  /// \param[in] impl
  ///     The handler of this command.
  ///
  /// \param[in] help
  ///     The general description to show as part of the help message of this
  ///     command.
  ///
  /// \return
  ///     A lldb::SBCommand representing the newly created command.
  lldb::SBCommand AddCommand(const char *name,
                             lldb::SBCommandPluginInterface *impl,
                             const char *help);

  /// Add a new command to the lldb::CommandInterpreter.
  ///
  /// The new command won't support autorepeat. If you need this functionality,
  /// use the override of this function that accepts the \a auto_repeat_command
  /// parameter.
  ///
  /// \param[in] name
  ///     The name of the command.
  ///
  /// \param[in] impl
  ///     The handler of this command.
  ///
  /// \param[in] help
  ///     The general description to show as part of the help message of this
  ///     command.
  ///
  /// \param[in] syntax
  ///     The syntax to show as part of the help message of this command. This
  ///     could include a description of the different arguments and flags this
  ///     command accepts.
  ///
  /// \return
  ///     A lldb::SBCommand representing the newly created command.
  lldb::SBCommand AddCommand(const char *name,
                             lldb::SBCommandPluginInterface *impl,
                             const char *help, const char *syntax);

  /// Add a new command to the lldb::CommandInterpreter.
  ///
  /// \param[in] name
  ///     The name of the command.
  ///
  /// \param[in] impl
  ///     The handler of this command.
  ///
  /// \param[in] help
  ///     The general description to show as part of the help message of this
  ///     command.
  ///
  /// \param[in] syntax
  ///     The syntax to show as part of the help message of this command. This
  ///     could include a description of the different arguments and flags this
  ///     command accepts.
  ///
  /// \param[in] auto_repeat_command
  ///     Autorepeating is triggered when the user presses Enter successively
  ///     after executing a command. If \b nullptr is provided, the previous
  ///     exact command will be repeated. If \b "" is provided, autorepeating
  ///     is disabled. Otherwise, the provided string is used as a repeat
  ///     command.
  ///
  /// \return
  ///     A lldb::SBCommand representing the newly created command.
  lldb::SBCommand AddCommand(const char *name,
                             lldb::SBCommandPluginInterface *impl,
                             const char *help, const char *syntax,
                             const char *auto_repeat_command);
  void SourceInitFileInGlobalDirectory(lldb::SBCommandReturnObject &result);
#endif


  void SourceInitFileInHomeDirectory(lldb::SBCommandReturnObject &result);
  void SourceInitFileInHomeDirectory(lldb::SBCommandReturnObject &result,
                                     bool is_repl);

  void
  SourceInitFileInCurrentWorkingDirectory(lldb::SBCommandReturnObject &result);

  lldb::ReturnStatus HandleCommand(const char *command_line,
                                   lldb::SBCommandReturnObject &result,
                                   bool add_to_history = false);

  lldb::ReturnStatus HandleCommand(const char *command_line,
                                   SBExecutionContext &exe_ctx,
                                   SBCommandReturnObject &result,
                                   bool add_to_history = false);

  void HandleCommandsFromFile(lldb::SBFileSpec &file,
                              lldb::SBExecutionContext &override_context,
                              lldb::SBCommandInterpreterRunOptions &options,
                              lldb::SBCommandReturnObject result);

  // The pointer based interface is not useful in SWIG, since the cursor &
  // last_char arguments are string pointers INTO current_line and you can't do
  // that in a scripting language interface in general...

  // In either case, the way this works is that the you give it a line and
  // cursor position in the line.  The function will return the number of
  // completions.  The matches list will contain number_of_completions + 1
  // elements.  The first element is the common substring after the cursor
  // position for all the matches.  The rest of the elements are the matches.
  // The first element is useful if you are emulating the common shell behavior
  // where the tab completes to the string that is common among all the
  // matches, then you should first check if the first element is non-empty,
  // and if so just insert it and move the cursor to the end of the insertion.
  // The next tab will return an empty common substring, and a list of choices
  // (if any), at which point you should display the choices and let the user
  // type further to disambiguate.

#ifndef SWIG
  int HandleCompletion(const char *current_line, const char *cursor,
                       const char *last_char, int match_start_point,
                       int max_return_elements, lldb::SBStringList &matches);
#endif

  int HandleCompletion(const char *current_line, uint32_t cursor_pos,
                       int match_start_point, int max_return_elements,
                       lldb::SBStringList &matches);

  // Same as HandleCompletion, but also fills out `descriptions` with
  // descriptions for each match.
#ifndef SWIG
  int HandleCompletionWithDescriptions(
      const char *current_line, const char *cursor, const char *last_char,
      int match_start_point, int max_return_elements,
      lldb::SBStringList &matches, lldb::SBStringList &descriptions);
#endif

  int HandleCompletionWithDescriptions(const char *current_line,
                                       uint32_t cursor_pos,
                                       int match_start_point,
                                       int max_return_elements,
                                       lldb::SBStringList &matches,
                                       lldb::SBStringList &descriptions);

  /// Returns whether an interrupt flag was raised either by the SBDebugger - 
  /// when the function is not running on the RunCommandInterpreter thread, or
  /// by SBCommandInterpreter::InterruptCommand if it is.  If your code is doing
  /// interruptible work, check this API periodically, and interrupt if it 
  /// returns true.
  bool WasInterrupted() const;
  
  /// Interrupts the command currently executing in the RunCommandInterpreter
  /// thread.
  ///
  /// \return
  ///   \b true if there was a command in progress to recieve the interrupt.
  ///   \b false if there's no command currently in flight.
  bool InterruptCommand();

  // Catch commands before they execute by registering a callback that will get
  // called when the command gets executed. This allows GUI or command line
  // interfaces to intercept a command and stop it from happening
#ifndef SWIG
  bool SetCommandOverrideCallback(const char *command_name,
                                  lldb::CommandOverrideCallback callback,
                                  void *baton);
#endif

  /// Return true if the command interpreter is the active IO handler.
  ///
  /// This indicates that any input coming into the debugger handles will
  /// go to the command interpreter and will result in LLDB command line
  /// commands being executed.
  bool IsActive();

  /// Get the string that needs to be written to the debugger stdin file
  /// handle when a control character is typed.
  ///
  /// Some GUI programs will intercept "control + char" sequences and want
  /// to have them do what normally would happen when using a real
  /// terminal, so this function allows GUI programs to emulate this
  /// functionality.
  ///
  /// \param[in] ch
  ///     The character that was typed along with the control key
  ///
  /// \return
  ///     The string that should be written into the file handle that is
  ///     feeding the input stream for the debugger, or nullptr if there is
  ///     no string for this control key.
  const char *GetIOHandlerControlSequence(char ch);

  bool GetPromptOnQuit();

  void SetPromptOnQuit(bool b);

  /// Sets whether the command interpreter should allow custom exit codes
  /// for the 'quit' command.
  void AllowExitCodeOnQuit(bool allow);

  /// Returns true if the user has called the 'quit' command with a custom exit
  /// code.
  bool HasCustomQuitExitCode();

  /// Returns the exit code that the user has specified when running the
  /// 'quit' command. Returns 0 if the user hasn't called 'quit' at all or
  /// without a custom exit code.
  int GetQuitStatus();

  /// Resolve the command just as HandleCommand would, expanding abbreviations
  /// and aliases.  If successful, result->GetOutput has the full expansion.
  void ResolveCommand(const char *command_line, SBCommandReturnObject &result);

  SBStructuredData GetStatistics();

protected:
  friend class lldb_private::CommandPluginInterfaceImplementation;

  /// Access using SBDebugger::GetCommandInterpreter();
  SBCommandInterpreter(lldb_private::CommandInterpreter *interpreter_ptr);
  lldb_private::CommandInterpreter &ref();

  lldb_private::CommandInterpreter *get();

  void reset(lldb_private::CommandInterpreter *);

private:
  friend class SBDebugger;

  lldb_private::CommandInterpreter *m_opaque_ptr;
};

#ifndef SWIG
class SBCommandPluginInterface {
public:
  virtual ~SBCommandPluginInterface() = default;

  virtual bool DoExecute(lldb::SBDebugger /*debugger*/, char ** /*command*/,
                         lldb::SBCommandReturnObject & /*result*/) {
    return false;
  }
};

class SBCommand {
public:
  SBCommand();

  explicit operator bool() const;

  bool IsValid();

  const char *GetName();

  const char *GetHelp();

  const char *GetHelpLong();

  void SetHelp(const char *);

  void SetHelpLong(const char *);

  uint32_t GetFlags();

  void SetFlags(uint32_t flags);

  lldb::SBCommand AddMultiwordCommand(const char *name,
                                      const char *help = nullptr);

  /// Add a new subcommand to the lldb::SBCommand.
  ///
  /// The new command won't support autorepeat. If you need this functionality,
  /// use the override of this function that accepts the \a auto_repeat
  /// parameter.
  ///
  /// \param[in] name
  ///     The name of the command.
  ///
  /// \param[in] impl
  ///     The handler of this command.
  ///
  /// \param[in] help
  ///     The general description to show as part of the help message of this
  ///     command.
  ///
  /// \return
  ///     A lldb::SBCommand representing the newly created command.
  lldb::SBCommand AddCommand(const char *name,
                             lldb::SBCommandPluginInterface *impl,
                             const char *help = nullptr);

  /// Add a new subcommand to the lldb::SBCommand.
  ///
  /// The new command won't support autorepeat. If you need this functionality,
  /// use the override of this function that accepts the \a auto_repeat_command
  /// parameter.
  ///
  /// \param[in] name
  ///     The name of the command.
  ///
  /// \param[in] impl
  ///     The handler of this command.
  ///
  /// \param[in] help
  ///     The general description to show as part of the help message of this
  ///     command.
  ///
  /// \param[in] syntax
  ///     The syntax to show as part of the help message of this command. This
  ///     could include a description of the different arguments and flags this
  ///     command accepts.
  ///
  /// \return
  ///     A lldb::SBCommand representing the newly created command.
  lldb::SBCommand AddCommand(const char *name,
                             lldb::SBCommandPluginInterface *impl,
                             const char *help, const char *syntax);

  /// Add a new subcommand to the lldb::SBCommand.
  ///
  /// The new command won't support autorepeat. If you need this functionality,
  /// use the override of this function that accepts the \a auto_repeat_command
  /// parameter.
  ///
  /// \param[in] name
  ///     The name of the command.
  ///
  /// \param[in] impl
  ///     The handler of this command.
  ///
  /// \param[in] help
  ///     The general description to show as part of the help message of this
  ///     command.
  ///
  /// \param[in] syntax
  ///     The syntax to show as part of the help message of this command. This
  ///     could include a description of the different arguments and flags this
  ///     command accepts.
  ///
  /// \param[in] auto_repeat_command
  ///     Autorepeating is triggered when the user presses Enter successively
  ///     after executing a command. If \b nullptr is provided, the previous
  ///     exact command will be repeated. If \b "" is provided, autorepeating
  ///     is disabled. Otherwise, the provided string is used as a repeat
  ///     command.
  ///
  /// \return
  ///     A lldb::SBCommand representing the newly created command.
  lldb::SBCommand AddCommand(const char *name,
                             lldb::SBCommandPluginInterface *impl,
                             const char *help, const char *syntax,
                             const char *auto_repeat_command);

private:
  friend class SBDebugger;
  friend class SBCommandInterpreter;

  SBCommand(lldb::CommandObjectSP cmd_sp);

  lldb::CommandObjectSP m_opaque_sp;
};
#endif

} // namespace lldb

#endif // LLDB_API_SBCOMMANDINTERPRETER_H