CameronReed/Cpp-Argument-Parser
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Fixed some crashes

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This commit is contained in:
Cameron Reed 2022-07-26 21:26:02 -06:00
parent 03db3c64a2
commit fbb7a689e7
3 changed files with 63 additions and 47 deletions
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32
Inc/argparser.h
View File

@ -7,6 +7,16 @@ namespace Cam
namespace Arguments
{
enum ERROR {
IMPOSSIBLE = -1,
NO_ERROR,
ERROR_UNKNOWN_OPTION,
ERROR_INCORRECT_TYPE,
ERROR_MISSING_ARGUMENT,
ERROR_MISSING_POSITIONAL_ARGUMENT,
SPECIAL_CASE_HELP
};
enum OPTTYPE
{
FLAG = 0,
@ -54,18 +64,18 @@ public:
void set_description(const char* description);
void add_option(Option* opt);
void add_positional_argument(PositionalArgument* arg);
int parse(int argc, char** argv);
ERROR parse(int argc, char** argv);
private:
int print_help_message();
int handle_long_option(const char* option, const char* next_value);
int handle_short_option(const char option, const char* next_value);
int handle_positional_argument(const char* arg);
int get_option_data(Option* opt, const char* data_str);
int unknown_option(const char* option);
int unknown_option(const char option);
int incorrect_type(const char* option, const char* got);
int missing_argument(const char* option);
int missing_positional_argument(const char* arg);
ERROR print_help_message();
ERROR handle_long_option(const char* option, const char* next_value);
ERROR handle_short_option(const char option, const char* next_value);
ERROR handle_positional_argument(const char* arg);
ERROR get_option_data(Option* opt, const char* option_name, const char* data_str);
ERROR unknown_option(const char* option);
ERROR unknown_option(const char option);
ERROR incorrect_type(const char* option, const char* got);
ERROR missing_argument(const char* option);
ERROR missing_positional_argument(const char* arg);
private:
const char* m_program_name;
const char* m_description;

70
Src/argparser.cpp
View File

@ -68,13 +68,13 @@ void Parser::add_positional_argument(PositionalArgument* arg)
m_positional_args.push_back(arg);
}
int Parser::parse(int argc, char ** argv)
ERROR Parser::parse(int argc, char ** argv)
{
for (m_opt_index = 1; m_opt_index < argc; m_opt_index++)
{
if (argv[m_opt_index][0] == '-' && argv[m_opt_index][1] == '-') {
int ret = handle_long_option(argv[m_opt_index] + 2, m_opt_index + 1 < argc ? argv[m_opt_index + 1] : nullptr);
ERROR ret = handle_long_option(argv[m_opt_index] + 2, m_opt_index + 1 < argc ? argv[m_opt_index + 1] : nullptr);
if (ret)
return ret;
@ -82,7 +82,7 @@ int Parser::parse(int argc, char ** argv)
for (uint8_t i = 1; argv[m_opt_index][i] != 0; i++) {
bool last = argv[m_opt_index][i + 1] == 0;
int ret = handle_short_option(argv[m_opt_index][i], m_opt_index + 1 < argc && last ? argv[m_opt_index + 1] : nullptr);
ERROR ret = handle_short_option(argv[m_opt_index][i], m_opt_index + 1 < argc && last ? argv[m_opt_index + 1] : nullptr);
if (ret)
return ret;
if (last)
@ -91,7 +91,7 @@ int Parser::parse(int argc, char ** argv)
} else {
int ret = handle_positional_argument(argv[m_opt_index]);
ERROR ret = handle_positional_argument(argv[m_opt_index]);
if (ret)
return ret;
@ -105,14 +105,16 @@ int Parser::parse(int argc, char ** argv)
}
}
return 0;
return NO_ERROR;
}
int Parser::handle_long_option(const char* option, const char* next_value)
ERROR Parser::handle_long_option(const char* option, const char* next_value)
{
Option* matched_option = nullptr;
for (Option* opt: m_options) {
if (opt->m_name == nullptr)
continue;
if (strcmp(opt->m_name, option) == 0) {
matched_option = opt;
break;
@ -129,16 +131,16 @@ int Parser::handle_long_option(const char* option, const char* next_value)
} else {
matched_option->m_found = true;
return get_option_data(matched_option, next_value);
return get_option_data(matched_option, matched_option->m_name, next_value);
}
std::cout << "Congratulations! You have reached an impossible state" << std::endl << std::endl;
std::cout << "Reality is broken :)" << std::endl;
return -1;
return IMPOSSIBLE;
}
int Parser::handle_short_option(const char option, const char* next_value)
ERROR Parser::handle_short_option(const char option, const char* next_value)
{
Option* matched_option = nullptr;
@ -159,16 +161,20 @@ int Parser::handle_short_option(const char option, const char* next_value)
} else {
matched_option->m_found = true;
return get_option_data(matched_option, next_value);
char* name = new char[2];
name[0] = matched_option->m_short_name;
name[1] = 0;
return get_option_data(matched_option, name, next_value);
delete[] name;
}
std::cout << "Congratulations! You have reached impossible state #2" << std::endl << std::endl;
std::cout << "Reality is broken :)" << std::endl;
return -1;
return IMPOSSIBLE;
}
int Parser::handle_positional_argument(const char* arg)
ERROR Parser::handle_positional_argument(const char* arg)
{
if (m_pos_index >= m_positional_args.size())
return unknown_option(arg);
@ -187,16 +193,16 @@ int Parser::handle_positional_argument(const char* arg)
pos_arg->m_found = true;
m_pos_index++;
return 0;
return NO_ERROR;
}
int Parser::get_option_data(Option* opt, const char* data_str)
ERROR Parser::get_option_data(Option* opt, const char* option_name, const char* data_str)
{
if (opt->m_type == FLAG)
return 0;
return NO_ERROR;
if (data_str == nullptr || data_str[0] == '-')
return missing_argument(opt->m_name);
return missing_argument(option_name);
if (opt->m_type == INT) {
int* val = new int;
@ -208,48 +214,48 @@ int Parser::get_option_data(Option* opt, const char* data_str)
}
m_opt_index++;
return 0;
return NO_ERROR;
}
int Parser::unknown_option(const char* option)
ERROR Parser::unknown_option(const char* option)
{
std::cout << m_program_name << ": invalid option '" << option << '\'' << std::endl << std::endl;
std::cout << "See " << m_program_name << " --help" << std::endl;
return -1;
return ERROR_UNKNOWN_OPTION;
}
int Parser::unknown_option(const char option)
ERROR Parser::unknown_option(const char option)
{
std::cout << m_program_name << ": invalid option: " << option << std::endl << std::endl;
std::cout << "See " << m_program_name << " --help" << std::endl;
return -1;
return ERROR_UNKNOWN_OPTION;
}
int Parser::incorrect_type(const char* option, const char* got)
ERROR Parser::incorrect_type(const char* option, const char* got)
{
std::cout << m_program_name << ": argument '" << option << "' expects an integer as an argument, got " << got << " instead" << std::endl;
return -4;
return ERROR_INCORRECT_TYPE;
}
int Arguments::Parser::missing_argument(const char* option)
ERROR Parser::missing_argument(const char* option)
{
std::cout << m_program_name << ": Missing argument for option '" << option << '\'' << std::endl;
return -3;
return ERROR_MISSING_ARGUMENT;
}
int Parser::missing_positional_argument(const char* arg)
ERROR Parser::missing_positional_argument(const char* arg)
{
std::cout << m_program_name << ": Missing required positional argument '" << arg << "'" << std::endl << std::endl;
std::cout << "See " << m_program_name << " --help" << std::endl;
return -5;
return ERROR_MISSING_POSITIONAL_ARGUMENT;
}
int Parser::print_help_message()
ERROR Parser::print_help_message()
{
std::cout << "Usage: " << m_program_name << (m_options.size() > 0 ? " [OPTIONS]" : "");
for (PositionalArgument* arg: m_positional_args)
@ -273,11 +279,11 @@ int Parser::print_help_message()
if (opt->m_name != nullptr)
std::cout << "--" << opt->m_name;
if (opt->m_short_name != 0) {
for (uint8_t i = 0; i < 16 - strlen(opt->m_name); i++)
if (opt->m_name != nullptr) {
for (uint8_t i = 0; i < 20 - strlen(opt->m_name) - ((opt->m_short_name != 0) * 4); i++)
std::cout << ' ';
} else {
for (uint8_t i = 0; i < 20 - strlen(opt->m_name); i++)
for (uint8_t i = 0; i < 24 - ((opt->m_short_name != 0) * 4); i++)
std::cout << ' ';
}
@ -287,7 +293,7 @@ int Parser::print_help_message()
if (m_description)
std::cout << std::endl << std::endl << m_description << std::endl;
return 1;
return SPECIAL_CASE_HELP;
}
} // namespace Arguments

8
test.cpp
View File

@ -8,11 +8,11 @@ int main(int argc, char **argv) {
parser.set_description("A test of argument parsing :)");
Arguments::Option first("first", 'f', "First arg", Arguments::STRING);
Arguments::Option first('f', "First arg", Arguments::STRING);
Arguments::Option second("second", 's', "Second arg", Arguments::INT);
Arguments::Option third("third", 't', "Third arg", Arguments::FLAG);
Arguments::Option third("third", "Third arg", Arguments::FLAG);
Arguments::PositionalArgument name("name", false, Arguments::STRING);
Arguments::PositionalArgument name("name", true, Arguments::STRING);
Arguments::PositionalArgument age("age", false, Arguments::INT);
parser.add_option(&first);
@ -23,7 +23,7 @@ int main(int argc, char **argv) {
parser.add_positional_argument(&age);
if (parser.parse(argc, argv) != 0) {
return -1;
return 0;
}
std::cout << "Found:" << std::endl;