llvm-project/lldb/source/Commands/CommandObjectMultiword.cpp

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

#include "lldb/Interpreter/CommandObjectMultiword.h"
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Interpreter/CommandContext.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Core/Options.h"
#include "lldb/Interpreter/CommandReturnObject.h"

using namespace lldb;
using namespace lldb_private;

//-------------------------------------------------------------------------
// CommandObjectMultiword
//-------------------------------------------------------------------------

CommandObjectMultiword::CommandObjectMultiword
(
    const char *name,
    const char *help,
    const char *syntax,
    uint32_t flags
) :
    CommandObject (name, help, syntax, flags)
{
}

CommandObjectMultiword::~CommandObjectMultiword ()
{
}

CommandObjectSP
CommandObjectMultiword::GetSubcommandSP (const char *sub_cmd, StringList *matches)
{
    CommandObjectSP return_cmd_sp;
    CommandObject::CommandMap::iterator pos;

    if (!m_subcommand_dict.empty())
    {
        pos = m_subcommand_dict.find (sub_cmd);
        if (pos != m_subcommand_dict.end())
            return_cmd_sp = pos->second;
        else
        {

            StringList local_matches;
            if (matches == NULL)
                matches = &local_matches;
            int num_matches = CommandObject::AddNamesMatchingPartialString (m_subcommand_dict, sub_cmd, *matches);

            if (num_matches == 1)
            {
                // Cleaner, but slightly less efficient would be to call back into this function, since I now
                // know I have an exact match...

                sub_cmd = matches->GetStringAtIndex(0);
                pos = m_subcommand_dict.find(sub_cmd);
                if (pos != m_subcommand_dict.end())
                    return_cmd_sp = pos->second;
            }
        }
    }
    return return_cmd_sp;
}

CommandObject *
CommandObjectMultiword::GetSubcommandObject (const char *sub_cmd, StringList *matches)
{
    return GetSubcommandSP(sub_cmd, matches).get();
}

bool
CommandObjectMultiword::LoadSubCommand (CommandObjectSP cmd_obj, const char *name,
                                          CommandInterpreter *interpreter)
{
    CommandMap::iterator pos;
    bool success = true;

    pos = m_subcommand_dict.find(name);
    if (pos == m_subcommand_dict.end())
    {
        m_subcommand_dict[name] = cmd_obj;
        interpreter->CrossRegisterCommand (name, GetCommandName());
    }
    else
        success = false;

    return success;
}

bool
CommandObjectMultiword::Execute
(
    Args& args,
    CommandContext *context,
    CommandInterpreter *interpreter,
    CommandReturnObject &result
)
{
    const size_t argc = args.GetArgumentCount();
    if (argc == 0)
    {
        GenerateHelpText (result, interpreter);
    }
    else
    {
        const char *sub_command = args.GetArgumentAtIndex (0);

        if (sub_command)
        {
            if (::strcasecmp (sub_command, "help") == 0)
            {
                GenerateHelpText (result, interpreter);
            }
            else if (!m_subcommand_dict.empty())
            {
                StringList matches;
                CommandObject *sub_cmd_obj = GetSubcommandObject(sub_command, &matches);
                if (sub_cmd_obj != NULL)
                {
                    // Now call CommandObject::Execute to process and options in 'rest_of_line'.  From there
                    // the command-specific version of Execute will be called, with the processed arguments.

                    args.Shift();

                    sub_cmd_obj->ExecuteWithOptions (args, context, interpreter, result);
                }
                else
                {
                    std::string error_msg;
                    int num_subcmd_matches = matches.GetSize();
                    if (num_subcmd_matches > 0)
                        error_msg.assign ("ambiguous command ");
                    else
                        error_msg.assign ("invalid command ");

                    error_msg.append ("'");
                    error_msg.append (GetCommandName());
                    error_msg.append (" ");
                    error_msg.append (sub_command);
                    error_msg.append ("'");

                    if (num_subcmd_matches > 0)
                    {
                        error_msg.append (" Possible completions:");
                        for (int i = 0; i < num_subcmd_matches; i++)
                        {
                            error_msg.append ("\n\t");
                            error_msg.append (matches.GetStringAtIndex (i));
                        }
                    }
                    error_msg.append ("\n");
                    result.AppendRawError (error_msg.c_str(), error_msg.size());
                    result.SetStatus (eReturnStatusFailed);
                }
            }
            else
            {
                result.AppendErrorWithFormat ("'%s' does not have any subcommands.\n", GetCommandName());
                result.SetStatus (eReturnStatusFailed);
            }
        }
    }

    return result.Succeeded();
}

void
CommandObjectMultiword::GenerateHelpText (CommandReturnObject &result, CommandInterpreter *interpreter)
{
    // First time through here, generate the help text for the object and
    // push it to the return result object as well

    StreamString &output_stream = result.GetOutputStream();
    output_stream.PutCString ("The following subcommands are supported:\n\n");

    CommandMap::iterator pos;
    std::string longest_word = interpreter->FindLongestCommandWord (m_subcommand_dict);
    uint32_t max_len = 0;

    if (! longest_word.empty())
        max_len = strlen (longest_word.c_str()) + 4; // Indent the output by 4 spaces.

    for (pos = m_subcommand_dict.begin(); pos != m_subcommand_dict.end(); ++pos)
    {
        std::string indented_command ("    ");
        indented_command.append (pos->first);
        interpreter->OutputFormattedHelpText (result.GetOutputStream(), indented_command.c_str(), "--", 
                                              pos->second->GetHelp(), max_len);
    }

    output_stream.PutCString ("\nFor more help on any particular subcommand, type 'help <command> <subcommand>'.\n");

    result.SetStatus (eReturnStatusSuccessFinishNoResult);
}

int
CommandObjectMultiword::HandleCompletion
(
    Args &input,
    int &cursor_index,
    int &cursor_char_position,
    int match_start_point,
    int max_return_elements,
    CommandInterpreter *interpreter,
    StringList &matches
)
{
    if (cursor_index == 0)
    {
        CommandObject::AddNamesMatchingPartialString (m_subcommand_dict, input.GetArgumentAtIndex(0), matches);

        if (matches.GetSize() == 1
            && matches.GetStringAtIndex(0) != NULL
            && strcmp (input.GetArgumentAtIndex(0), matches.GetStringAtIndex(0)) == 0)
        {
            StringList temp_matches;
            CommandObject *cmd_obj = GetSubcommandObject (input.GetArgumentAtIndex(0), &temp_matches);
            if (cmd_obj != NULL)
            {
                matches.DeleteStringAtIndex (0);
                input.Shift();
                cursor_char_position = 0;
                input.AppendArgument ("");
                return cmd_obj->HandleCompletion (input, cursor_index, cursor_char_position, match_start_point,
                                                  max_return_elements, interpreter, matches);
            }
            else
                return matches.GetSize();
        }
        else
            return matches.GetSize();
    }
    else
    {
        CommandObject *sub_command_object = GetSubcommandObject (input.GetArgumentAtIndex(0), &matches);
        if (sub_command_object == NULL)
        {
            return matches.GetSize();
        }
        else
        {
            // Remove the one match that we got from calling GetSubcommandObject.
            matches.DeleteStringAtIndex(0);
            input.Shift();
            cursor_index--;
            return sub_command_object->HandleCompletion (input, cursor_index, cursor_char_position, match_start_point,
                                                         max_return_elements, interpreter, matches);
        }

    }
}