CommandLineArguments.cpp

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*/

#include "CommandLineArguments.hpp"

#include <cassert>
#include <cstddef>
#include <algorithm>

CommandLineArguments::CommandLineArguments()
    : p_argc(nullptr),
      p_argv(nullptr)
{
    // Make doubly sure there's only one instance
    assert(mpInstance == nullptr);
}

CommandLineArguments* CommandLineArguments::Instance()
{
    if (mpInstance == nullptr)
    {
        mpInstance = new CommandLineArguments;
    }
    return mpInstance;
}

CommandLineArguments* CommandLineArguments::mpInstance = nullptr;

bool CommandLineArguments::OptionExists(const std::string& rOption)
{
    TestOptionFormat(rOption);
    try
    {
        return(GetIndexForArgument(rOption));
    }
    catch (const Exception&)
    {
        return false;
    }
}

char* CommandLineArguments::GetValueCorrespondingToOption(const std::string& rOption, int valueNumber)
{
    EXCEPT_IF_NOT(valueNumber>0);
    TestOptionFormat(rOption);

    int index = GetIndexForArgument(rOption);
    int num_args = GetNumberOfArgumentsForOption(rOption, true);
    if (num_args < valueNumber)
    {
        std::stringstream ss;
        ss<<"Index="<<valueNumber<<" requested for '"<<rOption<<"', but only "<<num_args<<" given.";
        EXCEPTION(ss.str());
    }

    return (*p_argv)[index+valueNumber];
}

double CommandLineArguments::GetDoubleCorrespondingToOption(const std::string& rOption, int valueNumber)
{
    char* val = GetValueCorrespondingToOption(rOption, valueNumber);
    return atof(val);
}

int CommandLineArguments::GetIntCorrespondingToOption(const std::string& rOption, int valueNumber)
{
    char* val = GetValueCorrespondingToOption(rOption, valueNumber);
    return atoi(val);
}

unsigned CommandLineArguments::GetUnsignedCorrespondingToOption(const std::string& rOption, int valueNumber)
{
    char* val = GetValueCorrespondingToOption(rOption, valueNumber);
    int i = atoi(val);
    if (i < 0)
    {
        EXCEPTION("Option is a negative number and cannot be converted to unsigned.");
    }
    return (unsigned)(i);
}

int CommandLineArguments::GetIndexForArgument(std::string rOption)
{
    TestOptionFormat(rOption);

    for (int i=1; i<*p_argc; i++)
    {
        if (rOption==std::string((*p_argv)[i]))
        {
            return i;
        }
    }
    EXCEPTION("Command line option '"+rOption+"' does not exist");
}

int CommandLineArguments::GetNumberOfArgumentsForOption(const std::string& rOption, bool throwIfNone)
{
    int start_idx = GetIndexForArgument(rOption);

    int end_idx = start_idx;
    for (int i=start_idx+1; i<*p_argc; i++)
    {
        std::string argument = std::string((*p_argv)[i]);
        if (argument.substr(0,1)=="-" && argument.substr(1,1).find_first_of("0123456789")==std::string::npos)
        {
            break;
        }
        end_idx = i;
    }

    if (end_idx == start_idx)
    {
        if (throwIfNone)
        {
            EXCEPTION("No value(s) given after command line option '" + rOption + "'");
        }
        else
        {
            return 0;
        }
    }

    return end_idx - start_idx;
}

std::string CommandLineArguments::GetStringCorrespondingToOption(const std::string& rOption, int valueNumber)
{
    char* val = GetValueCorrespondingToOption(rOption, valueNumber);
    std::string string_arg(val);
    return string_arg;
}

std::vector<std::string> CommandLineArguments::GetStringsCorrespondingToOption(const std::string& rOption)
{
    std::vector<std::string> strings;
    int num_args = GetNumberOfArgumentsForOption(rOption, true);
    for (int i=1; i<=num_args; ++i)
    {
        strings.push_back(GetStringCorrespondingToOption(rOption, i));
    }
    return strings;
}

std::vector<double> CommandLineArguments::GetDoublesCorrespondingToOption(const std::string& rOption)
{
    std::vector<double> doubles;
    int num_args = GetNumberOfArgumentsForOption(rOption, true);
    for (int i=1; i<=num_args; ++i)
    {
        doubles.push_back(GetDoubleCorrespondingToOption(rOption, i));
    }
    return doubles;
}

std::vector<unsigned> CommandLineArguments::GetUnsignedsCorrespondingToOption(const std::string& rOption)
{
    std::vector<unsigned> unsigneds;
    int num_args = GetNumberOfArgumentsForOption(rOption, true);
    for (int i=1; i<=num_args; ++i)
    {
        unsigneds.push_back(GetUnsignedCorrespondingToOption(rOption, i));
    }
    return unsigneds;
}

std::vector<int> CommandLineArguments::GetIntsCorrespondingToOption(const std::string& rOption)
{
    std::vector<int> ints;
    int num_args = GetNumberOfArgumentsForOption(rOption, true);
    for (int i=1; i<=num_args; ++i)
    {
        ints.push_back(GetIntCorrespondingToOption(rOption, i));
    }
    return ints;
}

bool CommandLineArguments::GetBoolCorrespondingToOption(const std::string& rOption)
{
    bool result;
    std::string string_result = GetStringCorrespondingToOption(rOption);

    // Convert to lowercase
    std::transform(string_result.begin(), string_result.end(), string_result.begin(), ::tolower);

    if (string_result=="0" || string_result=="false")
    {
        result = false;
    }
    else if (string_result=="1" || string_result=="true")
    {
        result = true;
    }
    else
    {
        EXCEPTION("The option '" << rOption << "' argument '" <<
            GetStringCorrespondingToOption(rOption) << "' cannot be converted to a bool.");
    }

    return result;
}

void CommandLineArguments::TestOptionFormat(const std::string& rOption)
{
    if (!( rOption.substr(0,1) == "-" && rOption.substr(1,1).find_first_of("0123456789")==std::string::npos))
    {
        EXCEPTION("A command line option must begin with '-' followed by a non-numeric character.");
    }
}