CommandLineArguments.cpp

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*/

#include "CommandLineArguments.hpp"

#include <cassert>
#include <cstddef>

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

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

CommandLineArguments* CommandLineArguments::mpInstance = NULL;

bool CommandLineArguments::OptionExists(std::string option)
{
    int index = GetIndexForArgument(option);
    assert(index!=0);

    return (index > 0);
}

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

    int num_args = GetNumberOfArgumentsForOption(option);
    int index = GetIndexForArgument(option);
    EXCEPT_IF_NOT(index>0);
    EXCEPT_IF_NOT(num_args>=valueNumber);
    return (*p_argv)[index+valueNumber];
}

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

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

unsigned CommandLineArguments::GetUnsignedCorrespondingToOption(std::string option, int valueNumber)
{
    char* val = GetValueCorrespondingToOption(option, 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 argument)
{
    TestOptionFormat(argument);

    for (int i=1; i<*p_argc; i++)
    {
        if (argument==std::string((*p_argv)[i]))
        {
            return i;
        }
    }
    return -1;
}

int CommandLineArguments::GetNumberOfArgumentsForOption(std::string option)
{
    int start_idx = GetIndexForArgument(option);
    if (start_idx < 0)
    {
        EXCEPTION("Command line option '" + option + "' does not exist");
    }

    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)
    {
        EXCEPTION("No value(s) given after command line option '" + option + "'");
    }

    return end_idx - start_idx;
}

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

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

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

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

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

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