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// Copyright (c) 2019 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "math-server" project.
// For details, see https://github.com/egor-tensin/math-server.
// Distributed under the MIT License.
#include <server/lexer/details/parse.hpp>
#include <server/lexer/error.hpp>
#include <server/lexer/lexer.hpp>
#include <server/lexer/token.hpp>
#include <server/lexer/token_type.hpp>
#include <boost/test/data/test_case.hpp>
#include <boost/test/data/monomorphic.hpp>
#include <boost/test/unit_test.hpp>
#include <ostream>
#include <string>
#include <string_view>
#include <vector>
BOOST_AUTO_TEST_SUITE(lexer_tests)
namespace bdata = boost::unit_test::data;
using math::server::Lexer;
using math::server::LexerError;
using math::server::lexer::Token;
using math::server::lexer::token::Type;
namespace details = math::server::lexer::details;
BOOST_AUTO_TEST_CASE(test_parse_number) {
// These are valid numbers:
BOOST_TEST(details::parse_number("0").value() == 0);
BOOST_TEST(details::parse_number("1.").value() == 1.);
BOOST_TEST(details::parse_number(".1").value() == .1);
// parse_* functions only consume a single token:
BOOST_TEST(details::parse_number(".1+1").value() == .1);
BOOST_TEST(details::parse_number("1e3").value() == 1e3);
BOOST_TEST(details::parse_number(".123e1").value() == .123e1);
BOOST_TEST(details::parse_number("123e-1").value() == 123e-1);
BOOST_TEST(details::parse_number("123e+1").value() == 123e+1);
BOOST_TEST(details::parse_number("1.e6").value() == 1.e6);
BOOST_TEST(details::parse_number("2.3e-4").value() == 2.3e-4);
// These are not numbers, but perhaps something else?
BOOST_TEST(!details::parse_number(".").has_value());
BOOST_TEST(!details::parse_number(".e3").has_value());
BOOST_TEST(!details::parse_number("e12").has_value());
// This is definitely a number, but a malformed one (an exponent must be
// followed by some digits).
BOOST_CHECK_THROW(details::parse_number("12e"), LexerError);
}
BOOST_AUTO_TEST_CASE(test_parse_const_token) {
BOOST_TEST(details::parse_const_token("+").value() == Type::PLUS);
// parse_* functions only consume a single token:
BOOST_TEST(details::parse_const_token("+/*").value() == Type::PLUS);
BOOST_TEST(details::parse_const_token("-").value() == Type::MINUS);
BOOST_TEST(details::parse_const_token("^^").value() == Type::CARET);
BOOST_TEST(!details::parse_const_token("&+").has_value());
}
namespace {
namespace get_tokens::valid {
const std::vector<std::string_view> input{
"",
" + - ",
"1+2",
".5^-1 ^ 4",
"1+2 * (3- 4e-2)",
" 2 * (1 + 3 * (1 - -3)) ",
};
// Some black magic-fuckery to resolve operator<< for std::vector<Token>.
// See https://stackoverflow.com/a/18817428/514684.
struct Expected {
std::vector<Token> m_tokens;
};
std::ostream& operator<<(std::ostream& os, const Expected& expected) {
for (const auto& token : expected.m_tokens) {
os << token;
}
return os;
}
const std::vector<Expected> expected{
{{}},
{{
Token{Type::PLUS},
Token{Type::MINUS},
}},
{{
Token{1},
Token{Type::PLUS},
Token{2},
}},
{{
Token{.5},
Token{Type::CARET},
Token{Type::MINUS},
Token{1},
Token{Type::CARET},
Token{4},
}},
{{
Token{1},
Token{Type::PLUS},
Token{2},
Token{Type::ASTERISK},
Token{Type::LEFT_PAREN},
Token{3},
Token{Type::MINUS},
Token{4e-2},
Token{Type::RIGHT_PAREN},
}},
{{
Token{2},
Token{Type::ASTERISK},
Token{Type::LEFT_PAREN},
Token{1},
Token{Type::PLUS},
Token{3},
Token{Type::ASTERISK},
Token{Type::LEFT_PAREN},
Token{1},
Token{Type::MINUS},
Token{Type::MINUS},
Token{3},
Token{Type::RIGHT_PAREN},
Token{Type::RIGHT_PAREN},
}},
};
}
namespace get_tokens::invalid {
const std::vector<std::string_view> input{
"&",
" 1 + 123 & 456",
};
const std::vector<std::string> error_msg{
"server error: lexer error: invalid input at: &",
"server error: lexer error: invalid input at: & 456",
};
}
}
BOOST_DATA_TEST_CASE(
test_get_tokens_valid,
bdata::make(get_tokens::valid::input) ^ get_tokens::valid::expected,
input,
expected) {
Lexer lexer{input};
const auto actual = lexer.get_tokens();
BOOST_CHECK_EQUAL_COLLECTIONS(actual.cbegin(), actual.cend(),
expected.m_tokens.cbegin(),
expected.m_tokens.cend());
}
BOOST_DATA_TEST_CASE(
test_get_tokens_invalid,
bdata::make(get_tokens::invalid::input) ^ get_tokens::invalid::error_msg,
input,
error_msg) {
BOOST_REQUIRE_THROW(do {
Lexer lexer{input};
lexer.get_tokens();
} while (0), LexerError);
try {
Lexer lexer{input};
lexer.get_tokens();
} catch (const LexerError& e) {
BOOST_TEST(error_msg == e.what());
}
}
BOOST_AUTO_TEST_SUITE_END()
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