#pragma once

#include <optional>
#include <stdexcept>
#include <string>

#include "secsgem/secs2/item.hpp"

// SML (SECS Message Language) parser — the inverse of `to_sml()` in
// codec.cpp.  Accepts the same human-readable form emitted by
// Item::sml() / Message::sml(): each item is `<TAG [count]? values >`
// with nesting for lists.  Strings are quoted; numeric literals are
// whitespace-separated; binary bytes use `0x` prefix or decimal.
//
// The grammar is loose but unambiguous.  Whitespace (incl. newlines)
// is insignificant outside of quoted strings.  The optional `[n]`
// count is accepted but not enforced — actual element counts come
// from the values that follow.  Boolean accepts T/F as well as 1/0.
namespace secsgem::secs2 {

class SmlError : public std::runtime_error {
 public:
  using std::runtime_error::runtime_error;
};

// Parse a single Item.  Throws SmlError on a malformed input.
Item parse_sml(const std::string& text);

// Try-style variant that returns nullopt instead of throwing.
std::optional<Item> try_parse_sml(const std::string& text);

}  // namespace secsgem::secs2