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-rw-r--r--src/fmt/test/format-impl-test.cc547
1 files changed, 547 insertions, 0 deletions
diff --git a/src/fmt/test/format-impl-test.cc b/src/fmt/test/format-impl-test.cc
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index 000000000..46486a6f4
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+++ b/src/fmt/test/format-impl-test.cc
@@ -0,0 +1,547 @@
+// Formatting library for C++ - formatting library implementation tests
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#include <algorithm>
+#include <cstring>
+
+// clang-format off
+#include "test-assert.h"
+// clang-format on
+
+#include "fmt/format.h"
+#include "gmock/gmock.h"
+#include "util.h"
+
+using fmt::detail::bigint;
+using fmt::detail::fp;
+using fmt::detail::max_value;
+
+static_assert(!std::is_copy_constructible<bigint>::value, "");
+static_assert(!std::is_copy_assignable<bigint>::value, "");
+
+TEST(bigint_test, construct) {
+ EXPECT_EQ(fmt::to_string(bigint()), "");
+ EXPECT_EQ(fmt::to_string(bigint(0x42)), "42");
+ EXPECT_EQ(fmt::to_string(bigint(0x123456789abcedf0)), "123456789abcedf0");
+}
+
+TEST(bigint_test, compare) {
+ bigint n1(42);
+ bigint n2(42);
+ EXPECT_EQ(compare(n1, n2), 0);
+ n2 <<= 32;
+ EXPECT_LT(compare(n1, n2), 0);
+ bigint n3(43);
+ EXPECT_LT(compare(n1, n3), 0);
+ EXPECT_GT(compare(n3, n1), 0);
+ bigint n4(42 * 0x100000001);
+ EXPECT_LT(compare(n2, n4), 0);
+ EXPECT_GT(compare(n4, n2), 0);
+}
+
+TEST(bigint_test, add_compare) {
+ EXPECT_LT(
+ add_compare(bigint(0xffffffff), bigint(0xffffffff), bigint(1) <<= 64), 0);
+ EXPECT_LT(add_compare(bigint(1) <<= 32, bigint(1), bigint(1) <<= 96), 0);
+ EXPECT_GT(add_compare(bigint(1) <<= 32, bigint(0), bigint(0xffffffff)), 0);
+ EXPECT_GT(add_compare(bigint(0), bigint(1) <<= 32, bigint(0xffffffff)), 0);
+ EXPECT_GT(add_compare(bigint(42), bigint(1), bigint(42)), 0);
+ EXPECT_GT(add_compare(bigint(0xffffffff), bigint(1), bigint(0xffffffff)), 0);
+ EXPECT_LT(add_compare(bigint(10), bigint(10), bigint(22)), 0);
+ EXPECT_LT(add_compare(bigint(0x100000010), bigint(0x100000010),
+ bigint(0x300000010)),
+ 0);
+ EXPECT_GT(add_compare(bigint(0x1ffffffff), bigint(0x100000002),
+ bigint(0x300000000)),
+ 0);
+ EXPECT_EQ(add_compare(bigint(0x1ffffffff), bigint(0x100000002),
+ bigint(0x300000001)),
+ 0);
+ EXPECT_LT(add_compare(bigint(0x1ffffffff), bigint(0x100000002),
+ bigint(0x300000002)),
+ 0);
+ EXPECT_LT(add_compare(bigint(0x1ffffffff), bigint(0x100000002),
+ bigint(0x300000003)),
+ 0);
+}
+
+TEST(bigint_test, shift_left) {
+ bigint n(0x42);
+ n <<= 0;
+ EXPECT_EQ(fmt::to_string(n), "42");
+ n <<= 1;
+ EXPECT_EQ(fmt::to_string(n), "84");
+ n <<= 25;
+ EXPECT_EQ(fmt::to_string(n), "108000000");
+}
+
+TEST(bigint_test, multiply) {
+ bigint n(0x42);
+ EXPECT_THROW(n *= 0, assertion_failure);
+ n *= 1;
+ EXPECT_EQ(fmt::to_string(n), "42");
+
+ n *= 2;
+ EXPECT_EQ(fmt::to_string(n), "84");
+ n *= 0x12345678;
+ EXPECT_EQ(fmt::to_string(n), "962fc95e0");
+
+ bigint bigmax(max_value<uint32_t>());
+ bigmax *= max_value<uint32_t>();
+ EXPECT_EQ(fmt::to_string(bigmax), "fffffffe00000001");
+
+ const auto max64 = max_value<uint64_t>();
+ bigmax = max64;
+ bigmax *= max64;
+ EXPECT_EQ(fmt::to_string(bigmax), "fffffffffffffffe0000000000000001");
+
+ const auto max128 = (fmt::detail::uint128_t(max64) << 64) | max64;
+ bigmax = max128;
+ bigmax *= max128;
+ EXPECT_EQ(fmt::to_string(bigmax),
+ "fffffffffffffffffffffffffffffffe00000000000000000000000000000001");
+}
+
+TEST(bigint_test, square) {
+ bigint n0(0);
+ n0.square();
+ EXPECT_EQ(fmt::to_string(n0), "0");
+ bigint n1(0x100);
+ n1.square();
+ EXPECT_EQ(fmt::to_string(n1), "10000");
+ bigint n2(0xfffffffff);
+ n2.square();
+ EXPECT_EQ(fmt::to_string(n2), "ffffffffe000000001");
+ bigint n3(max_value<uint64_t>());
+ n3.square();
+ EXPECT_EQ(fmt::to_string(n3), "fffffffffffffffe0000000000000001");
+ bigint n4;
+ n4.assign_pow10(10);
+ EXPECT_EQ(fmt::to_string(n4), "2540be400");
+}
+
+TEST(bigint_test, divmod_assign_zero_divisor) {
+ bigint zero(0);
+ EXPECT_THROW(bigint(0).divmod_assign(zero), assertion_failure);
+ EXPECT_THROW(bigint(42).divmod_assign(zero), assertion_failure);
+}
+
+TEST(bigint_test, divmod_assign_self) {
+ bigint n(100);
+ EXPECT_THROW(n.divmod_assign(n), assertion_failure);
+}
+
+TEST(bigint_test, divmod_assign_unaligned) {
+ // (42 << 340) / pow(10, 100):
+ bigint n1(42);
+ n1 <<= 340;
+ bigint n2;
+ n2.assign_pow10(100);
+ int result = n1.divmod_assign(n2);
+ EXPECT_EQ(result, 9406);
+ EXPECT_EQ(fmt::to_string(n1),
+ "10f8353019583bfc29ffc8f564e1b9f9d819dbb4cf783e4507eca1539220p96");
+}
+
+TEST(bigint_test, divmod_assign) {
+ // 100 / 10:
+ bigint n1(100);
+ int result = n1.divmod_assign(bigint(10));
+ EXPECT_EQ(result, 10);
+ EXPECT_EQ(fmt::to_string(n1), "0");
+ // pow(10, 100) / (42 << 320):
+ n1.assign_pow10(100);
+ result = n1.divmod_assign(bigint(42) <<= 320);
+ EXPECT_EQ(result, 111);
+ EXPECT_EQ(fmt::to_string(n1),
+ "13ad2594c37ceb0b2784c4ce0bf38ace408e211a7caab24308a82e8f10p96");
+ // 42 / 100:
+ bigint n2(42);
+ n1.assign_pow10(2);
+ result = n2.divmod_assign(n1);
+ EXPECT_EQ(result, 0);
+ EXPECT_EQ(fmt::to_string(n2), "2a");
+}
+
+template <bool is_iec559> void run_double_tests() {
+ fmt::print("warning: double is not IEC559, skipping FP tests\n");
+}
+
+template <> void run_double_tests<true>() {
+ // Construct from double.
+ EXPECT_EQ(fp(1.23), fp(0x13ae147ae147aeu, -52));
+}
+
+TEST(fp_test, double_tests) {
+ run_double_tests<std::numeric_limits<double>::is_iec559>();
+}
+
+TEST(fp_test, normalize) {
+ const auto v = fp(0xbeef, 42);
+ auto normalized = normalize(v);
+ EXPECT_EQ(normalized.f, 0xbeef000000000000);
+ EXPECT_EQ(normalized.e, -6);
+}
+
+TEST(fp_test, multiply) {
+ auto v = fp(123ULL << 32, 4) * fp(56ULL << 32, 7);
+ EXPECT_EQ(v.f, 123u * 56u);
+ EXPECT_EQ(v.e, 4 + 7 + 64);
+ v = fp(123ULL << 32, 4) * fp(567ULL << 31, 8);
+ EXPECT_EQ(v.f, (123 * 567 + 1u) / 2);
+ EXPECT_EQ(v.e, 4 + 8 + 64);
+}
+
+TEST(fp_test, get_cached_power) {
+ using limits = std::numeric_limits<double>;
+ for (auto exp = limits::min_exponent; exp <= limits::max_exponent; ++exp) {
+ int dec_exp = 0;
+ auto power = fmt::detail::get_cached_power(exp, dec_exp);
+ bigint exact, cache(power.f);
+ if (dec_exp >= 0) {
+ exact.assign_pow10(dec_exp);
+ if (power.e <= 0)
+ exact <<= -power.e;
+ else
+ cache <<= power.e;
+ exact.align(cache);
+ cache.align(exact);
+ auto exact_str = fmt::to_string(exact);
+ auto cache_str = fmt::to_string(cache);
+ EXPECT_EQ(exact_str.size(), cache_str.size());
+ EXPECT_EQ(exact_str.substr(0, 15), cache_str.substr(0, 15));
+ int diff = cache_str[15] - exact_str[15];
+ if (diff == 1)
+ EXPECT_GT(exact_str[16], '8');
+ else
+ EXPECT_EQ(diff, 0);
+ } else {
+ cache.assign_pow10(-dec_exp);
+ cache *= power.f + 1; // Inexact check.
+ exact = 1;
+ exact <<= -power.e;
+ exact.align(cache);
+ auto exact_str = fmt::to_string(exact);
+ auto cache_str = fmt::to_string(cache);
+ EXPECT_EQ(exact_str.size(), cache_str.size());
+ EXPECT_EQ(exact_str.substr(0, 16), cache_str.substr(0, 16));
+ }
+ }
+}
+
+TEST(fp_test, dragonbox_max_k) {
+ using fmt::detail::dragonbox::floor_log10_pow2;
+ using float_info = fmt::detail::dragonbox::float_info<float>;
+ EXPECT_EQ(
+ fmt::detail::const_check(float_info::max_k),
+ float_info::kappa -
+ floor_log10_pow2(std::numeric_limits<float>::min_exponent -
+ fmt::detail::num_significand_bits<float>() - 1));
+ using double_info = fmt::detail::dragonbox::float_info<double>;
+ EXPECT_EQ(
+ fmt::detail::const_check(double_info::max_k),
+ double_info::kappa -
+ floor_log10_pow2(std::numeric_limits<double>::min_exponent -
+ fmt::detail::num_significand_bits<double>() - 1));
+}
+
+TEST(fp_test, get_round_direction) {
+ using fmt::detail::get_round_direction;
+ using fmt::detail::round_direction;
+ EXPECT_EQ(get_round_direction(100, 50, 0), round_direction::down);
+ EXPECT_EQ(get_round_direction(100, 51, 0), round_direction::up);
+ EXPECT_EQ(get_round_direction(100, 40, 10), round_direction::down);
+ EXPECT_EQ(get_round_direction(100, 60, 10), round_direction::up);
+ for (size_t i = 41; i < 60; ++i)
+ EXPECT_EQ(get_round_direction(100, i, 10), round_direction::unknown);
+ uint64_t max = max_value<uint64_t>();
+ EXPECT_THROW(get_round_direction(100, 100, 0), assertion_failure);
+ EXPECT_THROW(get_round_direction(100, 0, 100), assertion_failure);
+ EXPECT_THROW(get_round_direction(100, 0, 50), assertion_failure);
+ // Check that remainder + error doesn't overflow.
+ EXPECT_EQ(get_round_direction(max, max - 1, 2), round_direction::up);
+ // Check that 2 * (remainder + error) doesn't overflow.
+ EXPECT_EQ(get_round_direction(max, max / 2 + 1, max / 2),
+ round_direction::unknown);
+ // Check that remainder - error doesn't overflow.
+ EXPECT_EQ(get_round_direction(100, 40, 41), round_direction::unknown);
+ // Check that 2 * (remainder - error) doesn't overflow.
+ EXPECT_EQ(get_round_direction(max, max - 1, 1), round_direction::up);
+}
+
+TEST(fp_test, fixed_handler) {
+ struct handler : fmt::detail::gen_digits_handler {
+ char buffer[10];
+ handler(int prec = 0) : fmt::detail::gen_digits_handler() {
+ buf = buffer;
+ precision = prec;
+ }
+ };
+ handler().on_digit('0', 100, 99, 0, false);
+ EXPECT_THROW(handler().on_digit('0', 100, 100, 0, false), assertion_failure);
+ namespace digits = fmt::detail::digits;
+ EXPECT_EQ(handler(1).on_digit('0', 100, 10, 10, false), digits::error);
+ // Check that divisor - error doesn't overflow.
+ EXPECT_EQ(handler(1).on_digit('0', 100, 10, 101, false), digits::error);
+ // Check that 2 * error doesn't overflow.
+ uint64_t max = max_value<uint64_t>();
+ EXPECT_EQ(handler(1).on_digit('0', max, 10, max - 1, false), digits::error);
+}
+
+TEST(fp_test, grisu_format_compiles_with_on_ieee_double) {
+ auto buf = fmt::memory_buffer();
+ format_float(0.42, -1, fmt::detail::float_specs(), buf);
+}
+
+TEST(format_impl_test, format_error_code) {
+ std::string msg = "error 42", sep = ": ";
+ {
+ auto buffer = fmt::memory_buffer();
+ format_to(fmt::appender(buffer), "garbage");
+ fmt::detail::format_error_code(buffer, 42, "test");
+ EXPECT_EQ(to_string(buffer), "test: " + msg);
+ }
+ {
+ auto buffer = fmt::memory_buffer();
+ auto prefix =
+ std::string(fmt::inline_buffer_size - msg.size() - sep.size() + 1, 'x');
+ fmt::detail::format_error_code(buffer, 42, prefix);
+ EXPECT_EQ(msg, to_string(buffer));
+ }
+ int codes[] = {42, -1};
+ for (size_t i = 0, n = sizeof(codes) / sizeof(*codes); i < n; ++i) {
+ // Test maximum buffer size.
+ msg = fmt::format("error {}", codes[i]);
+ fmt::memory_buffer buffer;
+ auto prefix =
+ std::string(fmt::inline_buffer_size - msg.size() - sep.size(), 'x');
+ fmt::detail::format_error_code(buffer, codes[i], prefix);
+ EXPECT_EQ(prefix + sep + msg, to_string(buffer));
+ size_t size = fmt::inline_buffer_size;
+ EXPECT_EQ(size, buffer.size());
+ buffer.resize(0);
+ // Test with a message that doesn't fit into the buffer.
+ prefix += 'x';
+ fmt::detail::format_error_code(buffer, codes[i], prefix);
+ EXPECT_EQ(to_string(buffer), msg);
+ }
+}
+
+TEST(format_impl_test, compute_width) {
+ EXPECT_EQ(4,
+ fmt::detail::compute_width(
+ fmt::basic_string_view<fmt::detail::char8_type>(
+ reinterpret_cast<const fmt::detail::char8_type*>("ёжик"))));
+}
+
+// Tests fmt::detail::count_digits for integer type Int.
+template <typename Int> void test_count_digits() {
+ for (Int i = 0; i < 10; ++i) EXPECT_EQ(1u, fmt::detail::count_digits(i));
+ for (Int i = 1, n = 1, end = max_value<Int>() / 10; n <= end; ++i) {
+ n *= 10;
+ EXPECT_EQ(fmt::detail::count_digits(n - 1), i);
+ EXPECT_EQ(fmt::detail::count_digits(n), i + 1);
+ }
+}
+
+TEST(format_impl_test, count_digits) {
+ test_count_digits<uint32_t>();
+ test_count_digits<uint64_t>();
+}
+
+#if FMT_USE_FLOAT128
+TEST(format_impl_test, write_float128) {
+ auto s = std::string();
+ fmt::detail::write<char>(std::back_inserter(s), __float128(42));
+ EXPECT_EQ(s, "42");
+}
+#endif
+
+struct double_double {
+ double a;
+ double b;
+
+ explicit constexpr double_double(double a_val = 0, double b_val = 0)
+ : a(a_val), b(b_val) {}
+
+ operator double() const { return a + b; }
+ auto operator-() const -> double_double { return double_double(-a, -b); }
+};
+
+bool operator>=(const double_double& lhs, const double_double& rhs) {
+ return lhs.a + lhs.b >= rhs.a + rhs.b;
+}
+
+struct slow_float {
+ float value;
+
+ explicit constexpr slow_float(float val = 0) : value(val) {}
+ operator float() const { return value; }
+ auto operator-() const -> slow_float { return slow_float(-value); }
+};
+
+namespace std {
+template <> struct is_floating_point<double_double> : std::true_type {};
+template <> struct numeric_limits<double_double> {
+ // is_iec559 is true for double-double in libstdc++.
+ static constexpr bool is_iec559 = true;
+ static constexpr int digits = 106;
+};
+
+template <> struct is_floating_point<slow_float> : std::true_type {};
+template <> struct numeric_limits<slow_float> : numeric_limits<float> {};
+} // namespace std
+
+FMT_BEGIN_NAMESPACE
+namespace detail {
+template <> struct is_fast_float<slow_float> : std::false_type {};
+namespace dragonbox {
+template <> struct float_info<slow_float> {
+ using carrier_uint = uint32_t;
+ static const int exponent_bits = 8;
+};
+} // namespace dragonbox
+} // namespace detail
+FMT_END_NAMESPACE
+
+TEST(format_impl_test, write_double_double) {
+ auto s = std::string();
+ fmt::detail::write<char>(std::back_inserter(s), double_double(42), {});
+ // Specializing is_floating_point is broken in MSVC.
+ if (!FMT_MSC_VERSION) EXPECT_EQ(s, "42");
+}
+
+TEST(format_impl_test, write_dragon_even) {
+ auto s = std::string();
+ fmt::detail::write<char>(std::back_inserter(s), slow_float(33554450.0f), {});
+ // Specializing is_floating_point is broken in MSVC.
+ if (!FMT_MSC_VERSION) EXPECT_EQ(s, "33554450");
+}
+
+#ifdef _WIN32
+# include <windows.h>
+
+TEST(format_impl_test, write_console_signature) {
+ decltype(::WriteConsoleW)* p = fmt::detail::WriteConsoleW;
+ (void)p;
+}
+#endif
+
+// A public domain branchless UTF-8 decoder by Christopher Wellons:
+// https://github.com/skeeto/branchless-utf8
+constexpr bool unicode_is_surrogate(uint32_t c) {
+ return c >= 0xD800U && c <= 0xDFFFU;
+}
+
+FMT_CONSTEXPR char* utf8_encode(char* s, uint32_t c) {
+ if (c >= (1UL << 16)) {
+ s[0] = static_cast<char>(0xf0 | (c >> 18));
+ s[1] = static_cast<char>(0x80 | ((c >> 12) & 0x3f));
+ s[2] = static_cast<char>(0x80 | ((c >> 6) & 0x3f));
+ s[3] = static_cast<char>(0x80 | ((c >> 0) & 0x3f));
+ return s + 4;
+ } else if (c >= (1UL << 11)) {
+ s[0] = static_cast<char>(0xe0 | (c >> 12));
+ s[1] = static_cast<char>(0x80 | ((c >> 6) & 0x3f));
+ s[2] = static_cast<char>(0x80 | ((c >> 0) & 0x3f));
+ return s + 3;
+ } else if (c >= (1UL << 7)) {
+ s[0] = static_cast<char>(0xc0 | (c >> 6));
+ s[1] = static_cast<char>(0x80 | ((c >> 0) & 0x3f));
+ return s + 2;
+ } else {
+ s[0] = static_cast<char>(c);
+ return s + 1;
+ }
+}
+
+// Make sure it can decode every character
+TEST(format_impl_test, utf8_decode_decode_all) {
+ for (uint32_t i = 0; i < 0x10ffff; i++) {
+ if (!unicode_is_surrogate(i)) {
+ int e;
+ uint32_t c;
+ char buf[8] = {0};
+ char* end = utf8_encode(buf, i);
+ const char* res = fmt::detail::utf8_decode(buf, &c, &e);
+ EXPECT_EQ(end, res);
+ EXPECT_EQ(c, i);
+ EXPECT_EQ(e, 0);
+ }
+ }
+}
+
+// Reject everything outside of U+0000..U+10FFFF
+TEST(format_impl_test, utf8_decode_out_of_range) {
+ for (uint32_t i = 0x110000; i < 0x1fffff; i++) {
+ int e;
+ uint32_t c;
+ char buf[8] = {0};
+ utf8_encode(buf, i);
+ const char* end = fmt::detail::utf8_decode(buf, &c, &e);
+ EXPECT_NE(e, 0);
+ EXPECT_EQ(end - buf, 4);
+ }
+}
+
+// Does it reject all surrogate halves?
+TEST(format_impl_test, utf8_decode_surrogate_halves) {
+ for (uint32_t i = 0xd800; i <= 0xdfff; i++) {
+ int e;
+ uint32_t c;
+ char buf[8] = {0};
+ utf8_encode(buf, i);
+ fmt::detail::utf8_decode(buf, &c, &e);
+ EXPECT_NE(e, 0);
+ }
+}
+
+// How about non-canonical encodings?
+TEST(format_impl_test, utf8_decode_non_canonical_encodings) {
+ int e;
+ uint32_t c;
+ const char* end;
+
+ char buf2[8] = {char(0xc0), char(0xA4)};
+ end = fmt::detail::utf8_decode(buf2, &c, &e);
+ EXPECT_NE(e, 0); // non-canonical len 2
+ EXPECT_EQ(end, buf2 + 2); // non-canonical recover 2
+
+ char buf3[8] = {char(0xe0), char(0x80), char(0xA4)};
+ end = fmt::detail::utf8_decode(buf3, &c, &e);
+ EXPECT_NE(e, 0); // non-canonical len 3
+ EXPECT_EQ(end, buf3 + 3); // non-canonical recover 3
+
+ char buf4[8] = {char(0xf0), char(0x80), char(0x80), char(0xA4)};
+ end = fmt::detail::utf8_decode(buf4, &c, &e);
+ EXPECT_NE(e, 0); // non-canonical encoding len 4
+ EXPECT_EQ(end, buf4 + 4); // non-canonical recover 4
+}
+
+// Let's try some bogus byte sequences
+TEST(format_impl_test, utf8_decode_bogus_byte_sequences) {
+ int e;
+ uint32_t c;
+
+ // Invalid first byte
+ char buf0[4] = {char(0xff)};
+ auto len = fmt::detail::utf8_decode(buf0, &c, &e) - buf0;
+ EXPECT_NE(e, 0); // "bogus [ff] 0x%02x U+%04lx", e, (unsigned long)c);
+ EXPECT_EQ(len, 1); // "bogus [ff] recovery %d", len);
+
+ // Invalid first byte
+ char buf1[4] = {char(0x80)};
+ len = fmt::detail::utf8_decode(buf1, &c, &e) - buf1;
+ EXPECT_NE(e, 0); // "bogus [80] 0x%02x U+%04lx", e, (unsigned long)c);
+ EXPECT_EQ(len, 1); // "bogus [80] recovery %d", len);
+
+ // Looks like a two-byte sequence but second byte is wrong
+ char buf2[4] = {char(0xc0), char(0x0a)};
+ len = fmt::detail::utf8_decode(buf2, &c, &e) - buf2;
+ EXPECT_NE(e, 0); // "bogus [c0 0a] 0x%02x U+%04lx", e, (unsigned long)c
+ EXPECT_EQ(len, 2); // "bogus [c0 0a] recovery %d", len);
+}
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