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#include "CArgsParser.h"
#include <AK/StringBuilder.h>
#include <stdio.h>
bool CArgsParserResult::is_present(const String& arg_name) const
{
return m_args.contains(arg_name);
}
String CArgsParserResult::get(const String& arg_name) const
{
return m_args.get(arg_name).value_or({});
}
const Vector<String>& CArgsParserResult::get_single_values() const
{
return m_single_values;
}
CArgsParser::Arg::Arg(const String& name, const String& description, bool required)
: name(name)
, description(description)
, required(required)
{
}
CArgsParser::Arg::Arg(const String& name, const String& value_name, const String& description, bool required)
: name(name)
, description(description)
, value_name(value_name)
, required(required)
{
}
CArgsParser::CArgsParser(const String& program_name)
: m_program_name(program_name)
, m_prefix("-")
{
}
CArgsParserResult CArgsParser::parse(int argc, char** argv)
{
CArgsParserResult res;
// We should have at least one parameter
if (argc < 2)
return {};
// We parse the first parameter at the index 1
if (parse_next_param(1, argv, argc - 1, res) != 0)
return {};
if (!check_required_args(res))
return {};
return res;
}
int CArgsParser::parse_next_param(int index, char** argv, const int params_left, CArgsParserResult& res)
{
if (params_left == 0)
return 0;
String param = argv[index];
// We check if the prefix is found at the beginning of the param name
if (is_param_valid(param)) {
auto prefix_length = m_prefix.length();
String param_name = param.substring(prefix_length, param.length() - prefix_length);
auto arg = m_args.find(param_name);
if (arg == m_args.end()) {
printf("Unknown arg \"");
if (!param_name.is_null())
printf("%s", param_name.characters());
printf("\"\n");
return -1;
}
// If this parameter must be followed by a value, we look for it
if (!arg->value.value_name.is_null()) {
if (params_left < 1) {
printf("Missing value for argument %s\n", arg->value.name.characters());
return -1;
}
String next = String(argv[index + 1]);
if (is_param_valid(next)) {
printf("Missing value for argument %s\n", arg->value.name.characters());
return -1;
}
res.m_args.set(arg->value.name, next);
return parse_next_param(index + 2, argv, params_left - 2, res);
}
// Single argument, not followed by a value
res.m_args.set(arg->value.name, "");
return parse_next_param(index + 1, argv, params_left - 1, res);
}
// Else, it's a value alone, a file name parameter for example
res.m_single_values.append(param);
return parse_next_param(index + 1, argv, params_left - 1, res);
}
bool CArgsParser::is_param_valid(const String& param_name)
{
return param_name.substring(0, m_prefix.length()) == m_prefix;
}
bool CArgsParser::check_required_args(const CArgsParserResult& res)
{
for (auto& it : m_args) {
if (it.value.required) {
if (!res.is_present(it.value.name))
return false;
}
}
int required_arguments = 0;
for (const auto& a : m_single_args) {
if (a.required) {
required_arguments++;
}
}
if (required_arguments != 0) {
if (res.m_single_values.size() < required_arguments)
return false;
}
return true;
}
void CArgsParser::add_required_arg(const String& name, const String& description)
{
m_args.set(name, Arg(name, description, true));
}
void CArgsParser::add_required_arg(const String& name, const String& value_name, const String& description)
{
m_args.set(name, Arg(name, value_name, description, true));
}
void CArgsParser::add_arg(const String& name, const String& description)
{
m_args.set(name, Arg(name, description, false));
}
void CArgsParser::add_arg(const String& name, const String& value_name, const String& description)
{
m_args.set(name, Arg(name, value_name, description, false));
}
void CArgsParser::add_single_value(const String& name)
{
m_single_args.append(SingleArg { name, false });
}
void CArgsParser::add_required_single_value(const String& name)
{
if (m_single_args.size() != 0) {
// adding required arguments after non-required arguments would be nonsensical
ASSERT(m_single_args.last().required);
}
m_single_args.append(SingleArg { name, true });
}
String CArgsParser::get_usage() const
{
StringBuilder sb;
sb.append("usage : ");
sb.append(m_program_name);
sb.append(" ");
for (auto& it : m_args) {
if (it.value.required)
sb.append("<");
else
sb.append("[");
sb.append(m_prefix);
sb.append(it.value.name);
if (!it.value.value_name.is_null()) {
sb.append(" ");
sb.append(it.value.value_name);
}
if (it.value.required)
sb.append("> ");
else
sb.append("] ");
}
for (auto& arg : m_single_args) {
if (arg.required)
sb.append("<");
else
sb.append("[");
sb.append(arg.name);
if (arg.required)
sb.append("> ");
else
sb.append("] ");
}
sb.append("\n");
for (auto& it : m_args) {
sb.append(" ");
sb.append(m_prefix);
sb.append(it.value.name);
if (!it.value.value_name.is_null()) {
sb.append(" ");
sb.append(it.value.value_name);
}
sb.append(" : ");
sb.append(it.value.description);
sb.append("\n");
}
return sb.to_string();
}
void CArgsParser::print_usage() const
{
printf("%s\n", get_usage().characters());
}
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