//===-- CommandAlias.h -----------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef liblldb_CommandAlias_h_
#define liblldb_CommandAlias_h_

// C Includes
// C++ Includes
#include <memory>

// Other libraries and framework includes
// Project includes
#include "lldb/lldb-forward.h"
#include "lldb/Interpreter/Args.h"
#include "lldb/Interpreter/CommandObject.h"

namespace lldb_private {
class CommandAlias : public CommandObject
{
public:
    typedef std::unique_ptr<CommandAlias> UniquePointer;

    CommandAlias (CommandInterpreter &interpreter,
                  lldb::CommandObjectSP cmd_sp,
                  const char *options_args,
                  const char *name,
                  const char *help = nullptr,
                  const char *syntax = nullptr,
                  uint32_t flags = 0);
    
    void
    GetAliasExpansion (StreamString &help_string);
    
    bool
    IsValid ()
    {
        return m_underlying_command_sp && m_option_args_sp;
    }
    
    explicit operator bool ()
    {
        return IsValid();
    }
    
    bool
    WantsRawCommandString() override;
    
    bool
    WantsCompletion() override;
    
    int
    HandleCompletion (Args &input,
                      int &cursor_index,
                      int &cursor_char_position,
                      int match_start_point,
                      int max_return_elements,
                      bool &word_complete,
                      StringList &matches) override;
    
    int
    HandleArgumentCompletion (Args &input,
                              int &cursor_index,
                              int &cursor_char_position,
                              OptionElementVector &opt_element_vector,
                              int match_start_point,
                              int max_return_elements,
                              bool &word_complete,
                              StringList &matches) override;
    
    Options*
    GetOptions() override;
    
    bool
    IsAlias () override { return true; }
    
    bool
    IsDashDashCommand () override;
    
    const char*
    GetHelp () override;
    
    const char*
    GetHelpLong () override;
    
    void
    SetHelp (const char * str) override;
    
    void
    SetHelpLong (const char * str) override;
    
    bool
    Execute(const char *args_string, CommandReturnObject &result) override;
    
    lldb::CommandObjectSP GetUnderlyingCommand() { return m_underlying_command_sp; }
    OptionArgVectorSP GetOptionArguments() { return m_option_args_sp; }
    const char* GetOptionString() { return m_option_string.c_str(); }
    
    // this takes an alias - potentially nested (i.e. an alias to an alias)
    // and expands it all the way to a non-alias command
    std::pair<lldb::CommandObjectSP, OptionArgVectorSP>
    Desugar ();
    
protected:
    bool
    IsNestedAlias ();
    
private:
    lldb::CommandObjectSP m_underlying_command_sp;
    std::string m_option_string;
    OptionArgVectorSP m_option_args_sp ;
    LazyBool m_is_dashdash_alias;
    bool m_did_set_help : 1;
    bool m_did_set_help_long : 1;
};
} // namespace lldb_private

#endif // liblldb_CommandAlias_h_
