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#include <library/cpp/yson_pull/detail/cescape.h>

#include <library/cpp/testing/unittest/registar.h>

using namespace NYsonPull::NDetail;

namespace {
    void test_roundtrip(const TVector<ui8>& str) {
        TStringBuf str_buf( 
            reinterpret_cast<const char*>(str.data()), 
            str.size()); 
        auto tmp = NCEscape::encode(str_buf); 
        auto dest = NCEscape::decode(tmp); 
        UNIT_ASSERT_VALUES_EQUAL_C( 
            str_buf, TStringBuf(dest), 
            "A[" << str.size() << "]: " << str_buf << '\n' 
                 << "B[" << tmp.size() << "]: " << tmp << '\n' 
                 << "C[" << dest.size() << "]: " << dest); 
    } 

    template <size_t N> 
    void test_exhaustive(TVector<ui8>& str) {
        for (int i = 0; i < 256; ++i) { 
            str[str.size() - N] = static_cast<char>(i); 
            test_exhaustive<N - 1>(str); 
        } 
    } 

    template <> 
    void test_exhaustive<0>(TVector<ui8>& str) {
        test_roundtrip(str); 
    }

    template <size_t N> 
    void test_exhaustive() { 
        TVector<ui8> str(N, ' ');
        test_exhaustive<N>(str); 
    } 

} // anonymous namespace

Y_UNIT_TEST_SUITE(CEscape) {
    Y_UNIT_TEST(ExhaustiveOneChar) {
        test_exhaustive<1>(); 
    } 

    Y_UNIT_TEST(ExhaustiveTwoChars) {
        test_exhaustive<2>(); 
    } 

    Y_UNIT_TEST(ExhaustiveThreeChars) {
        test_exhaustive<3>(); 
    } 

    Y_UNIT_TEST(SpecialEscapeEncode) {
        //UNIT_ASSERT_VALUES_EQUAL(R"(\b)", NCEscape::encode("\b")); 
        //UNIT_ASSERT_VALUES_EQUAL(R"(\f)", NCEscape::encode("\f")); 
        UNIT_ASSERT_VALUES_EQUAL(R"(\n)", NCEscape::encode("\n")); 
        UNIT_ASSERT_VALUES_EQUAL(R"(\r)", NCEscape::encode("\r")); 
        UNIT_ASSERT_VALUES_EQUAL(R"(\t)", NCEscape::encode("\t")); 
    } 

    Y_UNIT_TEST(SpecialEscapeDecode) {
        UNIT_ASSERT_VALUES_EQUAL("\b", NCEscape::decode(R"(\b)")); 
        UNIT_ASSERT_VALUES_EQUAL("\f", NCEscape::decode(R"(\f)")); 
        UNIT_ASSERT_VALUES_EQUAL("\n", NCEscape::decode(R"(\n)")); 
        UNIT_ASSERT_VALUES_EQUAL("\r", NCEscape::decode(R"(\r)")); 
        UNIT_ASSERT_VALUES_EQUAL("\t", NCEscape::decode(R"(\t)")); 
    } 

} // Y_UNIT_TEST_SUITE(CEscape)