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/*
* This source code is released into the public domain.
*/
module;
#include <expected>
#include <functional>
#include <string>
#include <ucl.h>
module nihil.ucl;
import nihil;
namespace nihil::ucl {
auto make_parser(int flags) -> std::expected<parser, nihil::error>
{
auto *p = ::ucl_parser_new(flags);
if (p != nullptr)
return p;
// TODO: Is there a way to get the actual error here?
return std::unexpected(nihil::error("failed to create parser"));
}
auto macro_handler::handle(unsigned char const *data,
std::size_t len, void *ud)
-> bool
{
auto handler = static_cast<macro_handler *>(ud);
auto string = std::string_view(
reinterpret_cast<char const *>(data),
len);
return handler->callback(string);
}
parser::parser(::ucl_parser *uclp)
: m_parser(uclp)
{
}
parser::~parser()
{
if (m_parser)
::ucl_parser_free(m_parser);
}
parser::parser(parser &&other) noexcept
: m_parser(std::exchange(other.m_parser, nullptr))
, m_macros(std::move(other.m_macros))
{
}
auto parser::operator=(this parser &self, parser &&other) noexcept
-> parser &
{
if (&self != &other) {
if (self.m_parser)
::ucl_parser_free(self.m_parser);
self.m_parser = std::exchange(other.m_parser, nullptr);
self.m_macros = std::move(other.m_macros);
}
return self;
}
auto parser::register_value(
this parser &self,
std::string_view variable,
std::string_view value)
-> void
{
::ucl_parser_register_variable(
self.get_parser(),
std::string(variable).c_str(),
std::string(value).c_str());
}
auto parser::top(this parser &self) -> map<object>
{
auto obj = ::ucl_parser_get_object(self.get_parser());
if (obj != nullptr)
// ucl_parser_get_object() refs the object for us.
return {noref, obj};
throw std::logic_error(
"attempt to call top() on an invalid ucl::parser");
}
auto parser::get_parser(this parser &self) -> ::ucl_parser *
{
if (self.m_parser == nullptr)
throw std::logic_error("attempt to fetch a null ucl::parser");
return self.m_parser;
}
} // namespace nihil::ucl
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