#include <catch2/catch.hpp>
#include "../src/Lexer.hpp"

class LexerTest
{
public:
  explicit LexerTest() {}
  virtual ~LexerTest() {}

  void test_next(zn::Lexer& lexer, std::string const& oracle)
  {
    auto node = lexer.try_next();
    INFO("expected " << oracle << " got nullptr");
    REQUIRE(nullptr != node);
    REQUIRE(oracle == node->string());
  }

protected:
  zn::Logger m_logger;
  zn::Loc m_loc {"tests/lexer"};
  zn::Lexer m_lexer { m_logger, m_loc };
};

TEST_CASE_METHOD(LexerTest, "Lexer_unknown_text")
{
  m_lexer.scan(" §§§ ");
  REQUIRE_THROWS_AS(m_lexer.try_next(), zn::lex_error);
}

TEST_CASE_METHOD(LexerTest, "Lexer_int")
{
  m_lexer.scan(" 3 -2 167 ");

  test_next(m_lexer, "INT[3]");
  test_next(m_lexer, "INT[-2]");
  test_next(m_lexer, "INT[167]");
  REQUIRE(nullptr == m_lexer.try_next());
}