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// Copyright 2019 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "pw_string/string_builder.h"
#include <cinttypes>
#include <cmath>
#include <cstdint>
#include <cstring>
#include <span>
#include <string_view>
#include "gtest/gtest.h"
#include "pw_string/format.h"
namespace this_pw_test {
struct CustomType {
uint32_t a;
uint32_t b;
static constexpr const char* kToString = "This is a CustomType";
CustomType() = default;
// Non-copyable to verify StringBuffer's << operator doesn't copy it.
CustomType(const CustomType&) = delete;
CustomType& operator=(const CustomType&) = delete;
};
} // namespace this_pw_test
namespace pw {
template <>
StatusWithSize ToString<this_pw_test::CustomType>(
const this_pw_test::CustomType&, std::span<char> buffer) {
return string::Format(buffer, this_pw_test::CustomType::kToString);
}
} // namespace pw
namespace pw {
namespace {
using this_pw_test::CustomType;
TEST(StringBuilder, EmptyBuffer_SizeAndMaxSizeAreCorrect) {
StringBuilder sb(std::span<char>{});
EXPECT_TRUE(sb.empty());
EXPECT_EQ(0u, sb.size());
EXPECT_EQ(0u, sb.max_size());
}
using namespace std::literals::string_view_literals;
constexpr std::string_view kNoTouch = "DO NOT TOUCH\0VALUE SHOULD NOT CHANGE"sv;
TEST(StringBuilder, EmptyBuffer_StreamOutput_WritesNothing) {
char buffer[kNoTouch.size()];
std::memcpy(buffer, kNoTouch.data(), sizeof(buffer));
StringBuilder sb(std::span(buffer, 0));
sb << CustomType() << " is " << 12345;
EXPECT_EQ(Status::ResourceExhausted(), sb.status());
EXPECT_EQ(kNoTouch, std::string_view(buffer, sizeof(buffer)));
}
TEST(StringBuilder, EmptyBuffer_Append_WritesNothing) {
char buffer[kNoTouch.size()];
std::memcpy(buffer, kNoTouch.data(), sizeof(buffer));
StringBuilder sb(std::span(buffer, 0));
EXPECT_FALSE(sb.append("Hello").ok());
EXPECT_EQ(kNoTouch, std::string_view(buffer, sizeof(buffer)));
}
TEST(StringBuilder, EmptyBuffer_Resize_WritesNothing) {
char buffer[kNoTouch.size()];
std::memcpy(buffer, kNoTouch.data(), sizeof(buffer));
StringBuilder sb(std::span(buffer, 0));
sb.resize(0);
EXPECT_TRUE(sb.ok());
EXPECT_EQ(kNoTouch, std::string_view(buffer, sizeof(buffer)));
}
TEST(StringBuilder, EmptyBuffer_AppendEmpty_ResourceExhausted) {
StringBuilder sb(std::span<char>{});
EXPECT_EQ(OkStatus(), sb.last_status());
EXPECT_EQ(OkStatus(), sb.status());
sb << "";
EXPECT_EQ(Status::ResourceExhausted(), sb.last_status());
EXPECT_EQ(Status::ResourceExhausted(), sb.status());
}
TEST(StringBuilder, Status_StartsOk) {
StringBuffer<16> sb;
EXPECT_EQ(OkStatus(), sb.status());
EXPECT_EQ(OkStatus(), sb.last_status());
}
TEST(StringBuilder, Status_StatusAndLastStatusUpdate) {
StringBuffer<16> sb;
sb << "Well, if only there were enough room in here for this string";
EXPECT_EQ(Status::ResourceExhausted(), sb.status());
EXPECT_EQ(Status::ResourceExhausted(), sb.last_status());
sb.resize(1029);
EXPECT_EQ(Status::OutOfRange(), sb.status());
EXPECT_EQ(Status::OutOfRange(), sb.last_status());
sb << "";
EXPECT_EQ(Status::OutOfRange(), sb.status());
EXPECT_EQ(OkStatus(), sb.last_status());
}
TEST(StringBuilder, Status_ClearStatus_SetsStatuesToOk) {
StringBuffer<2> sb = MakeString<2>("Won't fit!!!!!");
EXPECT_EQ(Status::ResourceExhausted(), sb.status());
EXPECT_EQ(Status::ResourceExhausted(), sb.last_status());
sb.clear_status();
EXPECT_EQ(OkStatus(), sb.status());
EXPECT_EQ(OkStatus(), sb.last_status());
}
TEST(StringBuilder, StreamOutput_OutputSelf) {
auto sb = MakeString<32>("echo!");
sb << sb;
EXPECT_STREQ("echo!echo!", sb.data());
EXPECT_EQ(10u, sb.size());
}
TEST(StringBuilder, PushBack) {
StringBuffer<12> sb;
sb.push_back('?');
EXPECT_EQ(OkStatus(), sb.last_status());
EXPECT_EQ(1u, sb.size());
EXPECT_STREQ("?", sb.data());
}
TEST(StringBuilder, PushBack_Full) {
StringBuffer<1> sb;
sb.push_back('!');
EXPECT_EQ(Status::ResourceExhausted(), sb.last_status());
EXPECT_EQ(0u, sb.size());
}
TEST(StringBuilder, PopBack) {
auto sb = MakeString<12>("Welcome!");
sb.pop_back();
EXPECT_EQ(OkStatus(), sb.last_status());
EXPECT_EQ(7u, sb.size());
EXPECT_STREQ("Welcome", sb.data());
}
TEST(StringBuilder, PopBack_Empty) {
StringBuffer<12> sb;
sb.pop_back();
EXPECT_EQ(Status::OutOfRange(), sb.last_status());
EXPECT_EQ(0u, sb.size());
}
TEST(StringBuilder, Append_NonTerminatedString) {
static char bad_string[256];
std::memset(bad_string, '?', sizeof(bad_string));
StringBuffer<6> sb;
EXPECT_EQ(Status::ResourceExhausted(), sb.append(bad_string).last_status());
EXPECT_STREQ("?????", sb.data());
}
TEST(StringBuilder, Append_Chars) {
StringBuffer<8> sb;
EXPECT_TRUE(sb.append(7, '?').ok());
EXPECT_STREQ("???????", sb.data());
}
TEST(StringBuilder, Append_Chars_Full) {
StringBuffer<8> sb;
EXPECT_EQ(Status::ResourceExhausted(), sb.append(8, '?').last_status());
EXPECT_STREQ("???????", sb.data());
}
TEST(StringBuilder, Append_PartialCString) {
StringBuffer<12> sb;
EXPECT_TRUE(sb.append("123456", 4).ok());
EXPECT_EQ(4u, sb.size());
EXPECT_STREQ("1234", sb.data());
}
TEST(StringBuilder, Append_CString) {
auto sb = MakeString("hello");
EXPECT_TRUE(sb.append(" goodbye").ok());
EXPECT_STREQ("hello goodbye", sb.data());
EXPECT_EQ(13u, sb.size());
}
TEST(StringBuilder, Append_CString_Full) {
auto sb = MakeString<6>("hello");
EXPECT_EQ(Status::ResourceExhausted(), sb.append("890123", 1).last_status());
EXPECT_EQ(Status::ResourceExhausted(), sb.status());
EXPECT_EQ(sb.max_size(), sb.size());
EXPECT_STREQ("hello", sb.data());
}
TEST(StringBuilder, Append_StringView) {
auto sb = MakeString<32>("hello");
EXPECT_TRUE(sb.append("???"sv).ok());
EXPECT_EQ("hello???"sv, sb);
}
TEST(StringBuilder, Append_StringView_Substring) {
auto sb = MakeString<32>("I like ");
EXPECT_TRUE(sb.append("your shoes!!!"sv, 5, 5).ok());
EXPECT_EQ("I like shoes"sv, sb);
}
TEST(StringBuilder, Append_StringView_RemainingSubstring) {
auto sb = MakeString<32>("I like ");
EXPECT_TRUE(sb.append("your shoes!!!"sv, 5).ok());
EXPECT_EQ("I like shoes!!!"sv, sb);
}
TEST(StringBuilder, Resize_Smaller) {
auto sb = MakeString<12>("Four");
sb.resize(2);
EXPECT_TRUE(sb.ok());
EXPECT_EQ(2u, sb.size());
EXPECT_STREQ("Fo", sb.data());
}
TEST(StringBuilder, Resize_Clear) {
auto sb = MakeString<12>("Four");
sb.resize(0);
EXPECT_TRUE(sb.ok());
EXPECT_EQ(0u, sb.size());
EXPECT_STREQ("", sb.data());
}
TEST(StringBuilder, Resize_Larger_Fails) {
auto sb = MakeString<12>("Four");
EXPECT_EQ(4u, sb.size());
sb.resize(10);
EXPECT_EQ(sb.status(), Status::OutOfRange());
EXPECT_EQ(4u, sb.size());
}
TEST(StringBuilder, Resize_LargerThanCapacity_Fails) {
auto sb = MakeString<12>("Four");
sb.resize(1234);
EXPECT_EQ(sb.status(), Status::OutOfRange());
EXPECT_EQ(4u, sb.size());
EXPECT_STREQ("Four", sb.data());
}
TEST(StringBuilder, Format_Normal) {
std::byte buffer[64];
StringBuilder sb(buffer);
EXPECT_TRUE(sb.Format("0x%x", 0xabc).ok());
EXPECT_STREQ("0xabc", sb.data());
sb << "def";
EXPECT_TRUE(sb.Format("GHI").ok());
EXPECT_STREQ("0xabcdefGHI", sb.data());
}
TEST(StringBuilder, Format_ExhaustBuffer) {
StringBuffer<6> sb;
EXPECT_EQ(Status::ResourceExhausted(), sb.Format("012345").status());
EXPECT_STREQ("01234", sb.data());
EXPECT_EQ(Status::ResourceExhausted(), sb.status());
}
TEST(StringBuilder, StreamOutput_MultipleTypes) {
constexpr const char* kExpected = "This is -1true example\n of this";
constexpr const char* kExample = "example";
StringBuffer<64> sb;
sb << "This is " << -1 << true << ' ' << kExample << '\n' << " of this";
EXPECT_STREQ(kExpected, sb.data());
EXPECT_EQ(std::strlen(kExpected), sb.size());
}
TEST(StringBuilder, StreamOutput_FullBufferIgnoresExtraStrings) {
StringBuffer<6> sb;
EXPECT_EQ(5u, sb.max_size()); // max_size() excludes the null terminator
sb << 1 - 1;
EXPECT_TRUE(sb.ok());
EXPECT_STREQ("0", sb.data());
sb << true << "Now it's way " << static_cast<unsigned char>(2) << " long";
EXPECT_FALSE(sb.ok());
EXPECT_EQ(Status::ResourceExhausted(), sb.status());
EXPECT_STREQ("0true", sb.data());
}
TEST(StringBuilder, StreamOutput_ExhaustBuffer_InOneString) {
StringBuffer<9> sb;
EXPECT_EQ(8u, sb.max_size());
sb << "0123456789"; // write 10 chars
EXPECT_FALSE(sb.ok());
EXPECT_STREQ("01234567", sb.data()); // only can fit 8
EXPECT_EQ(8u, sb.size());
sb << "no"
<< " more "
<< "room" << '?';
EXPECT_STREQ("01234567", sb.data());
}
TEST(StringBuilder, StreamOutput_ExhaustBuffer_InTwoStrings) {
StringBuffer<4> sb;
sb << "01"; // fill 3/4 of buffer
EXPECT_EQ(2u, sb.size());
sb << "234";
EXPECT_STREQ("012", sb.data());
EXPECT_EQ(Status::ResourceExhausted(), sb.status());
EXPECT_EQ(3u, sb.size());
}
TEST(StringBuilder, StreamOutput_NonTerminatedString) {
static char bad_string[256];
std::memset(bad_string, '?', sizeof(bad_string));
StringBuffer<6> sb;
sb << "hey" << bad_string;
EXPECT_EQ(Status::ResourceExhausted(), sb.status());
EXPECT_STREQ("hey??", sb.data());
}
TEST(StringBuilder, SteamOutput_StringView) {
StringBuffer<6> buffer;
constexpr std::string_view hello("hello");
buffer << hello;
EXPECT_EQ(OkStatus(), buffer.status());
EXPECT_STREQ("hello", buffer.data());
}
TEST(StringBuilder, StreamOutput_EmptyStringView) {
StringBuffer<4> buffer;
buffer << "hi" << std::string_view() << "!";
EXPECT_TRUE(buffer.ok());
EXPECT_STREQ("hi!", buffer.data());
}
TEST(StringBuffer, Assign) {
StringBuffer<10> one;
StringBuffer<10> two;
one << "What";
ASSERT_STREQ("What", one.data());
two = one;
EXPECT_STREQ("What", two.data());
EXPECT_NE(one.data(), two.data());
one << " the";
two << " heck";
EXPECT_STREQ("What the", one.data());
EXPECT_STREQ("What heck", two.data());
two << "0123456789";
ASSERT_STREQ("What heck", two.data());
ASSERT_EQ(Status::ResourceExhausted(), two.status());
ASSERT_EQ(Status::ResourceExhausted(), two.last_status());
one = two;
EXPECT_STREQ("What heck", one.data());
EXPECT_EQ(Status::ResourceExhausted(), one.status());
EXPECT_EQ(Status::ResourceExhausted(), one.last_status());
StringBuffer<12> three;
three = two;
EXPECT_STREQ(three.data(), two.data());
EXPECT_EQ(three.size(), two.size());
}
TEST(StringBuffer, CopyConstructFromSameSize) {
StringBuffer<10> one;
one << "What";
ASSERT_STREQ("What", one.data());
StringBuffer<10> two(one);
EXPECT_STREQ("What", two.data());
EXPECT_NE(one.data(), two.data());
one << " the";
two << " heck";
EXPECT_STREQ("What the", one.data());
EXPECT_STREQ("What heck", two.data());
two << "0123456789";
two << "";
ASSERT_STREQ("What heck", two.data());
ASSERT_EQ(Status::ResourceExhausted(), two.status());
ASSERT_EQ(OkStatus(), two.last_status());
}
TEST(StringBuffer, CopyConstructFromSmaller) {
StringBuffer<10> one = MakeString<10>("You are the chosen one.");
StringBuffer<12> two(one);
EXPECT_STREQ("You are t", two.data());
EXPECT_EQ(Status::ResourceExhausted(), two.status());
}
TEST(StringBuilder, Object) {
StringBuffer<64> sb;
sb << CustomType();
EXPECT_STREQ(CustomType::kToString, sb.data());
EXPECT_EQ(std::strlen(CustomType::kToString), sb.size());
}
TEST(MakeString, Object) {
CustomType custom;
const auto sb = MakeString<64>(custom);
EXPECT_STREQ(CustomType::kToString, sb.data());
EXPECT_EQ(std::strlen(CustomType::kToString), sb.size());
}
TEST(MakeString, IntegerTypes) {
EXPECT_STREQ("0123-4567",
MakeString(0ll,
1u,
2l,
3,
-4,
static_cast<unsigned short>(5),
static_cast<short>(6),
static_cast<unsigned char>(7))
.data());
}
TEST(MakeString, Char) {
EXPECT_STREQ("a b c", MakeString('a', ' ', 'b', ' ', 'c').data());
}
TEST(MakeString, Float) { EXPECT_STREQ("-inf", MakeString(-INFINITY).data()); }
TEST(MakeString, Pointer_Null) {
EXPECT_STREQ("(null)", MakeString(nullptr).data());
EXPECT_STREQ("(null)", MakeString(static_cast<void*>(nullptr)).data());
}
TEST(MakeString, Pointer_NonNull) {
EXPECT_STREQ("1", MakeString(reinterpret_cast<void*>(0x1)).data());
EXPECT_STREQ("123", MakeString(reinterpret_cast<int*>(0x123)).data());
}
TEST(MakeString, Pointer_CustomType) {
char expected[32] = {};
CustomType custom;
std::snprintf(expected,
sizeof(expected),
"%" PRIxPTR,
reinterpret_cast<uintptr_t>(&custom));
EXPECT_STREQ(expected, MakeString(&custom).data());
}
TEST(MakeString, Bool) {
EXPECT_STREQ("true", MakeString(true).data());
EXPECT_STREQ("false", MakeString(false).data());
}
TEST(MakeString, MutableString) {
char chars[] = {'C', 'o', 'o', 'l', '\0'};
EXPECT_STREQ("Cool?", MakeString(chars, "?").data());
}
TEST(MakeString, Empty_IsEmpty) { EXPECT_TRUE(MakeString().empty()); }
constexpr char kLongestString[] = "18446744073709551615"; // largest uint64_t
TEST(MakeString, DefaultSizeString_FitsWholeString) {
EXPECT_STREQ(
kLongestString,
MakeString(184, "467", u'\x04', "40", '7', '3', '7', "0", "", 955ul, 1615)
.data());
}
TEST(MakeString, LargerThanDefaultSize_Truncates) {
auto sb = MakeString("1844674407", 3709551615, 123456);
EXPECT_EQ(Status::ResourceExhausted(), sb.status());
EXPECT_STREQ(kLongestString, sb.data());
}
TEST(MakeString, StringLiteral_ResizesToFitWholeLiteral) {
EXPECT_STREQ("", MakeString().data());
[[maybe_unused]] auto normal = MakeString("");
static_assert(normal.max_size() == decltype(MakeString(1))::max_size());
EXPECT_EQ(normal.max_size(), decltype(MakeString(1))::max_size());
[[maybe_unused]] auto resized =
MakeString("This string is reeeeeeeeeaaaaallly long!!!!!");
static_assert(resized.max_size() > decltype(MakeString(1))::max_size());
static_assert(resized.max_size() ==
sizeof("This string is reeeeeeeeeaaaaallly long!!!!!") - 1);
EXPECT_GT(resized.max_size(), decltype(MakeString(1))::max_size());
EXPECT_EQ(resized.max_size(),
sizeof("This string is reeeeeeeeeaaaaallly long!!!!!") - 1);
}
TEST(MakeString, StringLiteral_UsesLongerFixedSize) {
auto fixed_size = MakeString<64>("");
static_assert(fixed_size.max_size() == 63u);
EXPECT_EQ(fixed_size.max_size(), 63u);
EXPECT_STREQ("", fixed_size.data());
}
TEST(MakeString, StringLiteral_TruncatesShorterFixedSize) {
EXPECT_STREQ("Goo", MakeString<4>("Google").data());
EXPECT_STREQ("Google", MakeString<7>("Google").data());
EXPECT_EQ(MakeString().max_size(), MakeString("Google").max_size());
EXPECT_STREQ("Google", MakeString("Google").data());
}
TEST(MakeString, DefaultSize_FitsMaxAndMinInts) {
EXPECT_STREQ("-9223372036854775808",
MakeString(std::numeric_limits<int64_t>::min()).data());
EXPECT_STREQ("18446744073709551615",
MakeString(std::numeric_limits<uint64_t>::max()).data());
}
TEST(MakeString, OutputToTemporaryStringBuffer) {
EXPECT_STREQ("hello", (MakeString<6>("hello ") << "world").data());
EXPECT_STREQ("hello world", (MakeString("hello ") << "world").data());
}
// Test MakeString's default size calculations.
template <typename... Args>
constexpr size_t DefaultStringBufferSize(Args&&...) {
return string_internal::DefaultStringBufferSize<Args...>();
}
// Default sizes are rounded up to 24 bytes.
static_assert(DefaultStringBufferSize("") == 24);
static_assert(DefaultStringBufferSize("123") == 24);
static_assert(DefaultStringBufferSize("123", "456", "78901234567890") == 24);
static_assert(DefaultStringBufferSize("1234567890", "1234567890", "123") == 24);
static_assert(DefaultStringBufferSize(1234, 5678, 9012) == 24);
// The buffer is sized to fix strings needing more than 24 bytes.
static_assert(DefaultStringBufferSize("1234567890", "1234567890", "1234") ==
25);
static_assert(DefaultStringBufferSize("1234567890", "1234567890", "12345") ==
26);
static_assert(DefaultStringBufferSize("1234567890", "1234567890", "12345678") ==
29);
// Four bytes are allocated for each non-string argument.
static_assert(DefaultStringBufferSize(1234, 5678, 9012, 3456, 7890, 1234) ==
25);
static_assert(DefaultStringBufferSize('a', nullptr, 'b', 4, 5, 6, 7, 8) == 33);
struct SomeCustomType {};
StringBuilder& operator<<(StringBuilder& sb, const SomeCustomType&) {
return sb << "SomeCustomType was here!";
}
TEST(StringBuilder, ShiftOperatorOverload_SameNamsepace) {
pw::StringBuffer<48> buffer;
buffer << SomeCustomType{};
EXPECT_STREQ("SomeCustomType was here!", buffer.c_str());
}
} // namespace
} // namespace pw
namespace some_other_ns {
struct MyCustomType {
int item;
};
pw::StringBuilder& operator<<(pw::StringBuilder& sb,
const MyCustomType& value) {
return sb << "MyCustomType(" << value.item << ')';
}
} // namespace some_other_ns
namespace pw_test_namespace {
TEST(StringBuilder, ShiftOperatorOverload_DifferentNamsepace) {
pw::StringBuffer<48> buffer;
buffer << "This is " << some_other_ns::MyCustomType{1138};
EXPECT_STREQ("This is MyCustomType(1138)", buffer.data());
}
} // namespace pw_test_namespace