mirror of
https://github.com/fmtlib/fmt.git
synced 2024-09-15 15:13:22 +00:00
403 lines
13 KiB
C++
403 lines
13 KiB
C++
// Formatting library for C++ - formatting library implementation tests
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//
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// Copyright (c) 2012 - present, Victor Zverovich
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// All rights reserved.
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//
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// For the license information refer to format.h.
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#include <algorithm>
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#include <cstring>
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// clang-format off
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#include "test-assert.h"
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// clang-format on
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#include "fmt/format.h"
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#include "gmock/gmock.h"
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#include "util.h"
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using fmt::detail::bigint;
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using fmt::detail::fp;
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using fmt::detail::max_value;
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static_assert(!std::is_copy_constructible<bigint>::value, "");
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static_assert(!std::is_copy_assignable<bigint>::value, "");
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TEST(bigint_test, construct) {
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EXPECT_EQ(fmt::to_string(bigint()), "");
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EXPECT_EQ(fmt::to_string(bigint(0x42)), "42");
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EXPECT_EQ(fmt::to_string(bigint(0x123456789abcedf0)), "123456789abcedf0");
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}
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TEST(bigint_test, compare) {
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bigint n1(42);
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bigint n2(42);
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EXPECT_EQ(compare(n1, n2), 0);
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n2 <<= 32;
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EXPECT_LT(compare(n1, n2), 0);
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bigint n3(43);
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EXPECT_LT(compare(n1, n3), 0);
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EXPECT_GT(compare(n3, n1), 0);
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bigint n4(42 * 0x100000001);
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EXPECT_LT(compare(n2, n4), 0);
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EXPECT_GT(compare(n4, n2), 0);
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}
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TEST(bigint_test, add_compare) {
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EXPECT_LT(
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add_compare(bigint(0xffffffff), bigint(0xffffffff), bigint(1) <<= 64), 0);
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EXPECT_LT(add_compare(bigint(1) <<= 32, bigint(1), bigint(1) <<= 96), 0);
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EXPECT_GT(add_compare(bigint(1) <<= 32, bigint(0), bigint(0xffffffff)), 0);
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EXPECT_GT(add_compare(bigint(0), bigint(1) <<= 32, bigint(0xffffffff)), 0);
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EXPECT_GT(add_compare(bigint(42), bigint(1), bigint(42)), 0);
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EXPECT_GT(add_compare(bigint(0xffffffff), bigint(1), bigint(0xffffffff)), 0);
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EXPECT_LT(add_compare(bigint(10), bigint(10), bigint(22)), 0);
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EXPECT_LT(add_compare(bigint(0x100000010), bigint(0x100000010),
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bigint(0x300000010)),
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0);
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EXPECT_GT(add_compare(bigint(0x1ffffffff), bigint(0x100000002),
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bigint(0x300000000)),
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0);
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EXPECT_EQ(add_compare(bigint(0x1ffffffff), bigint(0x100000002),
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bigint(0x300000001)),
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0);
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EXPECT_LT(add_compare(bigint(0x1ffffffff), bigint(0x100000002),
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bigint(0x300000002)),
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0);
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EXPECT_LT(add_compare(bigint(0x1ffffffff), bigint(0x100000002),
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bigint(0x300000003)),
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0);
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}
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TEST(bigint_test, shift_left) {
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bigint n(0x42);
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n <<= 0;
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EXPECT_EQ(fmt::to_string(n), "42");
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n <<= 1;
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EXPECT_EQ(fmt::to_string(n), "84");
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n <<= 25;
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EXPECT_EQ(fmt::to_string(n), "108000000");
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}
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TEST(bigint_test, multiply) {
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bigint n(0x42);
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EXPECT_THROW(n *= 0, assertion_failure);
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n *= 1;
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EXPECT_EQ(fmt::to_string(n), "42");
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n *= 2;
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EXPECT_EQ(fmt::to_string(n), "84");
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n *= 0x12345678;
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EXPECT_EQ(fmt::to_string(n), "962fc95e0");
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bigint bigmax(max_value<uint32_t>());
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bigmax *= max_value<uint32_t>();
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EXPECT_EQ(fmt::to_string(bigmax), "fffffffe00000001");
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const auto max64 = max_value<uint64_t>();
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bigmax = max64;
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bigmax *= max64;
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EXPECT_EQ(fmt::to_string(bigmax), "fffffffffffffffe0000000000000001");
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const auto max128 = (fmt::detail::uint128_t(max64) << 64) | max64;
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bigmax = max128;
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bigmax *= max128;
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EXPECT_EQ(fmt::to_string(bigmax),
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"fffffffffffffffffffffffffffffffe00000000000000000000000000000001");
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}
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TEST(bigint_test, square) {
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bigint n0(0);
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n0.square();
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EXPECT_EQ(fmt::to_string(n0), "0");
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bigint n1(0x100);
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n1.square();
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EXPECT_EQ(fmt::to_string(n1), "10000");
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bigint n2(0xfffffffff);
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n2.square();
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EXPECT_EQ(fmt::to_string(n2), "ffffffffe000000001");
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bigint n3(max_value<uint64_t>());
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n3.square();
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EXPECT_EQ(fmt::to_string(n3), "fffffffffffffffe0000000000000001");
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bigint n4;
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n4.assign_pow10(10);
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EXPECT_EQ(fmt::to_string(n4), "2540be400");
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}
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TEST(bigint_test, divmod_assign_zero_divisor) {
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bigint zero(0);
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EXPECT_THROW(bigint(0).divmod_assign(zero), assertion_failure);
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EXPECT_THROW(bigint(42).divmod_assign(zero), assertion_failure);
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}
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TEST(bigint_test, divmod_assign_self) {
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bigint n(100);
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EXPECT_THROW(n.divmod_assign(n), assertion_failure);
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}
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TEST(bigint_test, divmod_assign_unaligned) {
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// (42 << 340) / pow(10, 100):
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bigint n1(42);
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n1 <<= 340;
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bigint n2;
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n2.assign_pow10(100);
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int result = n1.divmod_assign(n2);
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EXPECT_EQ(result, 9406);
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EXPECT_EQ(fmt::to_string(n1),
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"10f8353019583bfc29ffc8f564e1b9f9d819dbb4cf783e4507eca1539220p96");
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}
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TEST(bigint_test, divmod_assign) {
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// 100 / 10:
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bigint n1(100);
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int result = n1.divmod_assign(bigint(10));
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EXPECT_EQ(result, 10);
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EXPECT_EQ(fmt::to_string(n1), "0");
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// pow(10, 100) / (42 << 320):
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n1.assign_pow10(100);
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result = n1.divmod_assign(bigint(42) <<= 320);
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EXPECT_EQ(result, 111);
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EXPECT_EQ(fmt::to_string(n1),
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"13ad2594c37ceb0b2784c4ce0bf38ace408e211a7caab24308a82e8f10p96");
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// 42 / 100:
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bigint n2(42);
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n1.assign_pow10(2);
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result = n2.divmod_assign(n1);
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EXPECT_EQ(result, 0);
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EXPECT_EQ(fmt::to_string(n2), "2a");
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}
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template <bool is_iec559> void run_double_tests() {
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fmt::print("warning: double is not IEC559, skipping FP tests\n");
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}
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template <> void run_double_tests<true>() {
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// Construct from double.
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EXPECT_EQ(fp(1.23), fp(0x13ae147ae147aeu, -52));
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}
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TEST(fp_test, double_tests) {
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run_double_tests<std::numeric_limits<double>::is_iec559>();
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}
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TEST(fp_test, normalize) {
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const auto v = fp(0xbeef, 42);
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auto normalized = normalize(v);
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EXPECT_EQ(normalized.f, 0xbeef000000000000);
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EXPECT_EQ(normalized.e, -6);
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}
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TEST(fp_test, multiply) {
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auto v = fp(123ULL << 32, 4) * fp(56ULL << 32, 7);
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EXPECT_EQ(v.f, 123u * 56u);
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EXPECT_EQ(v.e, 4 + 7 + 64);
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v = fp(123ULL << 32, 4) * fp(567ULL << 31, 8);
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EXPECT_EQ(v.f, (123 * 567 + 1u) / 2);
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EXPECT_EQ(v.e, 4 + 8 + 64);
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}
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TEST(fp_test, get_cached_power) {
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using limits = std::numeric_limits<double>;
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for (auto exp = limits::min_exponent; exp <= limits::max_exponent; ++exp) {
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int dec_exp = 0;
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auto power = fmt::detail::get_cached_power(exp, dec_exp);
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bigint exact, cache(power.f);
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if (dec_exp >= 0) {
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exact.assign_pow10(dec_exp);
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if (power.e <= 0)
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exact <<= -power.e;
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else
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cache <<= power.e;
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exact.align(cache);
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cache.align(exact);
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auto exact_str = fmt::to_string(exact);
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auto cache_str = fmt::to_string(cache);
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EXPECT_EQ(exact_str.size(), cache_str.size());
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EXPECT_EQ(exact_str.substr(0, 15), cache_str.substr(0, 15));
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int diff = cache_str[15] - exact_str[15];
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if (diff == 1)
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EXPECT_GT(exact_str[16], '8');
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else
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EXPECT_EQ(diff, 0);
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} else {
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cache.assign_pow10(-dec_exp);
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cache *= power.f + 1; // Inexact check.
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exact = 1;
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exact <<= -power.e;
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exact.align(cache);
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auto exact_str = fmt::to_string(exact);
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auto cache_str = fmt::to_string(cache);
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EXPECT_EQ(exact_str.size(), cache_str.size());
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EXPECT_EQ(exact_str.substr(0, 16), cache_str.substr(0, 16));
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}
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}
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}
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TEST(fp_test, dragonbox_max_k) {
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using fmt::detail::dragonbox::floor_log10_pow2;
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using float_info = fmt::detail::dragonbox::float_info<float>;
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EXPECT_EQ(
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fmt::detail::const_check(float_info::max_k),
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float_info::kappa -
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floor_log10_pow2(std::numeric_limits<float>::min_exponent -
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fmt::detail::num_significand_bits<float>() - 1));
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using double_info = fmt::detail::dragonbox::float_info<double>;
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EXPECT_EQ(
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fmt::detail::const_check(double_info::max_k),
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double_info::kappa -
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floor_log10_pow2(std::numeric_limits<double>::min_exponent -
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fmt::detail::num_significand_bits<double>() - 1));
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}
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TEST(fp_test, get_round_direction) {
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using fmt::detail::get_round_direction;
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using fmt::detail::round_direction;
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EXPECT_EQ(get_round_direction(100, 50, 0), round_direction::down);
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EXPECT_EQ(get_round_direction(100, 51, 0), round_direction::up);
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EXPECT_EQ(get_round_direction(100, 40, 10), round_direction::down);
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EXPECT_EQ(get_round_direction(100, 60, 10), round_direction::up);
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for (size_t i = 41; i < 60; ++i)
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EXPECT_EQ(get_round_direction(100, i, 10), round_direction::unknown);
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uint64_t max = max_value<uint64_t>();
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EXPECT_THROW(get_round_direction(100, 100, 0), assertion_failure);
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EXPECT_THROW(get_round_direction(100, 0, 100), assertion_failure);
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EXPECT_THROW(get_round_direction(100, 0, 50), assertion_failure);
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// Check that remainder + error doesn't overflow.
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EXPECT_EQ(get_round_direction(max, max - 1, 2), round_direction::up);
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// Check that 2 * (remainder + error) doesn't overflow.
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EXPECT_EQ(get_round_direction(max, max / 2 + 1, max / 2),
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round_direction::unknown);
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// Check that remainder - error doesn't overflow.
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EXPECT_EQ(get_round_direction(100, 40, 41), round_direction::unknown);
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// Check that 2 * (remainder - error) doesn't overflow.
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EXPECT_EQ(get_round_direction(max, max - 1, 1), round_direction::up);
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}
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TEST(fp_test, fixed_handler) {
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struct handler : fmt::detail::gen_digits_handler {
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char buffer[10];
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handler(int prec = 0) : fmt::detail::gen_digits_handler() {
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buf = buffer;
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precision = prec;
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}
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};
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handler().on_digit('0', 100, 99, 0, false);
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EXPECT_THROW(handler().on_digit('0', 100, 100, 0, false), assertion_failure);
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namespace digits = fmt::detail::digits;
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EXPECT_EQ(handler(1).on_digit('0', 100, 10, 10, false), digits::error);
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// Check that divisor - error doesn't overflow.
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EXPECT_EQ(handler(1).on_digit('0', 100, 10, 101, false), digits::error);
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// Check that 2 * error doesn't overflow.
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uint64_t max = max_value<uint64_t>();
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EXPECT_EQ(handler(1).on_digit('0', max, 10, max - 1, false), digits::error);
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}
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TEST(fp_test, grisu_format_compiles_with_on_ieee_double) {
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auto buf = fmt::memory_buffer();
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format_float(0.42, -1, fmt::detail::float_specs(), buf);
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}
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TEST(format_impl_test, format_error_code) {
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std::string msg = "error 42", sep = ": ";
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{
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auto buffer = fmt::memory_buffer();
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format_to(fmt::appender(buffer), "garbage");
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fmt::detail::format_error_code(buffer, 42, "test");
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EXPECT_EQ(to_string(buffer), "test: " + msg);
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}
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{
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auto buffer = fmt::memory_buffer();
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auto prefix =
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std::string(fmt::inline_buffer_size - msg.size() - sep.size() + 1, 'x');
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fmt::detail::format_error_code(buffer, 42, prefix);
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EXPECT_EQ(msg, to_string(buffer));
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}
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int codes[] = {42, -1};
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for (size_t i = 0, n = sizeof(codes) / sizeof(*codes); i < n; ++i) {
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// Test maximum buffer size.
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msg = fmt::format("error {}", codes[i]);
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fmt::memory_buffer buffer;
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auto prefix =
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std::string(fmt::inline_buffer_size - msg.size() - sep.size(), 'x');
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fmt::detail::format_error_code(buffer, codes[i], prefix);
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EXPECT_EQ(prefix + sep + msg, to_string(buffer));
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size_t size = fmt::inline_buffer_size;
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EXPECT_EQ(size, buffer.size());
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buffer.resize(0);
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// Test with a message that doesn't fit into the buffer.
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prefix += 'x';
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fmt::detail::format_error_code(buffer, codes[i], prefix);
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EXPECT_EQ(to_string(buffer), msg);
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}
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}
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TEST(format_impl_test, compute_width) {
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EXPECT_EQ(4,
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fmt::detail::compute_width(
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fmt::basic_string_view<fmt::detail::char8_type>(
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reinterpret_cast<const fmt::detail::char8_type*>("ёжик"))));
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}
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// Tests fmt::detail::count_digits for integer type Int.
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template <typename Int> void test_count_digits() {
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for (Int i = 0; i < 10; ++i) EXPECT_EQ(1u, fmt::detail::count_digits(i));
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for (Int i = 1, n = 1, end = max_value<Int>() / 10; n <= end; ++i) {
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n *= 10;
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EXPECT_EQ(fmt::detail::count_digits(n - 1), i);
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EXPECT_EQ(fmt::detail::count_digits(n), i + 1);
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}
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}
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TEST(format_impl_test, count_digits) {
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test_count_digits<uint32_t>();
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test_count_digits<uint64_t>();
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}
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#if FMT_USE_FLOAT128
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TEST(format_impl_test, write_float128) {
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auto s = std::string();
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fmt::detail::write<char>(std::back_inserter(s), __float128(42));
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EXPECT_EQ(s, "42");
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}
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#endif
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struct double_double {
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double a;
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double b;
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explicit constexpr double_double(double a_val = 0, double b_val = 0)
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: a(a_val), b(b_val) {}
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operator double() const { return a + b; }
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auto operator-() const -> double_double { return double_double(-a, -b); }
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};
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bool operator>=(const double_double& lhs, const double_double& rhs) {
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return lhs.a + lhs.b >= rhs.a + rhs.b;
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}
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namespace std {
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template <> struct is_floating_point<double_double> : std::true_type {};
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template <> struct numeric_limits<double_double> {
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static constexpr bool is_iec559 = false;
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static constexpr int digits = 106;
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};
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} // namespace std
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TEST(format_impl_test, write_double_double) {
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auto s = std::string();
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fmt::detail::write<char>(std::back_inserter(s), double_double(42), {});
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#ifndef _MSC_VER // MSVC has an issue with specializing is_floating_point.
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EXPECT_EQ(s, "42");
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#endif
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}
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#ifdef _WIN32
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# include <windows.h>
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TEST(format_impl_test, write_console_signature) {
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decltype(::WriteConsoleW)* p = fmt::detail::WriteConsoleW;
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(void)p;
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}
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#endif
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