#ifndef WILLOWC_INCLUDE_PARSER_HPP
#define WILLOWC_INCLUDE_PARSER_HPP

#include <ast.hpp>
#include <sourcemanager.hpp>
#include <tokenizer.hpp>

#include <willow/IR/DiagnosticEngine.h>

#include <memory>
#include <optional>
#include <vector>

namespace willowc {

class Parser {
public:
  Parser(SourceManager::File &f, willow::DiagnosticEngine &diagnostic_engine)
      : file_(f), tokenizer_(f.buf.get()),
        diagnostic_engine_(diagnostic_engine) {}

  std::optional<std::unique_ptr<ModuleAST>> run();

  TokenKind kind() const { return kinds_[pos_]; }
  std::size_t start() const { return starts_[pos_]; }

private:
  willow::DiagnosticBuilder emitParserError(Token t, willow::Severity severity);

  SourceManager::File &file_;
  std::vector<TokenKind> kinds_;
  std::vector<std::size_t> starts_;
  Tokenizer tokenizer_;
  std::size_t pos_;
  willow::DiagnosticEngine &diagnostic_engine_;

};

} // namespace willowc

#endif // WILLOWC_INCLUDE_PARSER_HPP