grino/tests/Lexer.cpp

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

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

  void test_next(grino::Lexer& lexer, std::string const& oracle)
  {
    auto node = lexer.next();
    REQUIRE(node != nullptr);
    REQUIRE(oracle == node->string());
  }

  void test_end(grino::Lexer& lexer)
  {
    auto node = lexer.next();
    REQUIRE(node == nullptr);
  }

protected:
  grino::Logger m_logger;
};

TEST_CASE_METHOD(LexerTest, "Lexer_errors")
{
  grino::Lexer lexer {m_logger, "tests/lexer"};
  lexer.scan(" § ");
  REQUIRE_THROWS_AS(lexer.next(), grino::lexical_error);
}

TEST_CASE_METHOD(LexerTest, "Lexer_booleans")
{
  grino::Lexer lexer {m_logger, "tests/lexer"};

  SECTION("space around")
    {
      lexer.scan(" true false ");
      test_next(lexer, "BOOL[true]");
      test_next(lexer, "BOOL[false]");
      test_end(lexer);
    }

  SECTION("no space around")
    {
      lexer.scan("true false");
      test_next(lexer, "BOOL[true]");
      test_next(lexer, "BOOL[false]");
      test_end(lexer);
    }
}

TEST_CASE_METHOD(LexerTest, "Lexer_comments")
{
  grino::Lexer lexer {m_logger, "tests/lexer"};

  lexer.scan(" true ; false \n\n true ");
  test_next(lexer, "BOOL[true]");
  test_next(lexer, "BOOL[true]");
  test_end(lexer);

}