muzgen/tests/Lexer.cpp

#include <catch2/catch.hpp>
#include <lib/Lexer.hpp>

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

protected:
};

static std::string next_val(muz::Lexer& lexer)
{
  auto tok = lexer.next();

  if (tok)
    {
      return tok->string();
    }

  return "";
}

static void next_val_err(muz::Lexer& lexer)
{
  REQUIRE_THROWS_AS(lexer.next(), muz::lexical_error);
}

TEST_CASE_METHOD(LexerTest, "Lexer_num")
{
  muz::Lexer lexer;
  lexer.scan(" 34 2.9 -7 -3.14 .1 1.");

  REQUIRE("NUM[34]" == next_val(lexer));
  REQUIRE("NUM[2.9]" == next_val(lexer));
  REQUIRE("NUM[-7]" == next_val(lexer));
  REQUIRE("NUM[-3.14]" == next_val(lexer));
  REQUIRE("NUM[.1]" == next_val(lexer));
  REQUIRE("NUM[1.]" == next_val(lexer));

  REQUIRE("" == next_val(lexer));
}

TEST_CASE_METHOD(LexerTest, "Lexer_ident")
{
  muz::Lexer lexer;
  lexer.scan(" hello hello_world @hello");

  REQUIRE("IDENT[hello]" == next_val(lexer));
  REQUIRE("IDENT[hello_world]" == next_val(lexer));
  REQUIRE("DIR_IDENT[@hello]" == next_val(lexer));

  REQUIRE("" == next_val(lexer));
}

TEST_CASE_METHOD(LexerTest, "Lexer_commands")
{
  muz::Lexer lexer;
  lexer.scan(" [[]");

  REQUIRE("OSQUARE" == next_val(lexer));
  REQUIRE("OSQUARE" == next_val(lexer));
  REQUIRE("CSQUARE" == next_val(lexer));

  REQUIRE("" == next_val(lexer));
}

TEST_CASE_METHOD(LexerTest, "Lexer_unknown_sym_error")
{
  muz::Lexer lexer;
  lexer.scan(" § [[ \n ]");
  next_val_err(lexer);
}

TEST_CASE_METHOD(LexerTest, "Lexer_comments")
{
  muz::Lexer lexer;
  lexer.scan(" # [[ \n ]");

  REQUIRE("CSQUARE" == next_val(lexer));

  REQUIRE("" == next_val(lexer));
}