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proxy_integration_tests.cpp
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167 lines (143 loc) · 4.84 KB
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// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
#include <gtest/gtest.h>
#include <iomanip>
#include <memory>
#include <memory_resource>
#include <numbers>
#include <proxy/proxy.h>
#include <sstream>
#include <string>
#include <vector>
namespace proxy_integration_tests_details {
PRO_DEF_MEM_DISPATCH(MemDraw, Draw);
PRO_DEF_MEM_DISPATCH(MemArea, Area);
struct Drawable : pro::facade_builder
::add_convention<MemDraw, void(std::ostream&)>
::add_convention<MemArea, double() noexcept>
::build {};
PRO_DEF_MEM_DISPATCH(MemLog, Log);
struct Logger : pro::facade_builder
::add_convention<MemLog, void(const char*), void(const char*, const std::exception&)>
::build {};
class Rectangle {
public:
explicit Rectangle(double width, double height) : width_(width), height_(height) {}
Rectangle(const Rectangle&) = default;
void Draw(std::ostream& out) const
{ out << "{Rectangle: width = " << width_ << ", height = " << height_ << "}"; }
double Area() const noexcept { return width_ * height_; }
private:
double width_;
double height_;
};
class Circle {
public:
explicit Circle(double radius) : radius_(radius) {}
Circle(const Circle&) = default;
void Draw(std::ostream& out) const { out << "{Circle: radius = " << radius_ << "}"; }
double Area() const noexcept { return std::numbers::pi * radius_ * radius_; }
private:
double radius_;
};
class Point {
public:
void Draw(std::ostream& out) const { out << "{Point}"; }
constexpr double Area() const noexcept { return 0; }
};
std::string PrintDrawableToString(pro::proxy<Drawable> p) {
std::stringstream result;
result << std::fixed << std::setprecision(5) << "shape = ";
p->Draw(result);
result << ", area = " << p->Area();
return std::move(result).str();
}
std::vector<std::string> ParseCommand(const std::string& s) {
std::vector<std::string> result(1u);
bool in_quote = false;
std::size_t last_valid = s.find_last_not_of(' ');
for (std::size_t i = 0u; i <= last_valid; ++i) {
if (s[i] == '`' && i < last_valid) {
result.back() += s[++i];
} else if (s[i] == '"') {
in_quote = !in_quote;
} else if (s[i] == ' ' && !in_quote) {
if (!result.back().empty()) {
result.emplace_back();
}
} else {
result.back() += s[i];
}
}
if (result.back().empty()) {
result.pop_back();
}
return result;
}
pro::proxy<Drawable> MakeDrawableFromCommand(const std::string& s) {
std::vector<std::string> parsed = ParseCommand(s);
if (!parsed.empty()) {
if (parsed[0u] == "Rectangle") {
if (parsed.size() == 3u) {
static std::pmr::unsynchronized_pool_resource rectangle_memory_pool;
std::pmr::polymorphic_allocator<> alloc{&rectangle_memory_pool};
return pro::allocate_proxy<Drawable, Rectangle>(alloc, std::stod(parsed[1u]), std::stod(parsed[2u]));
}
} else if (parsed[0u] == "Circle") {
if (parsed.size() == 2u) {
Circle circle{std::stod(parsed[1u])};
return pro::make_proxy<Drawable>(circle);
}
} else if (parsed[0u] == "Point") {
if (parsed.size() == 1u) {
static Point instance;
return &instance;
}
}
}
throw std::runtime_error{"Invalid command"};
}
class StreamLogger {
public:
explicit StreamLogger(std::ostream& out) : out_(&out) {}
StreamLogger(const StreamLogger&) = default;
void Log(const char* s) {
*out_ << "[INFO] " << s << "\n";
}
void Log(const char* s, const std::exception& e) {
*out_ << "[ERROR] " << s << " (exception info: " << e.what() << ")\n";
}
private:
std::ostream* out_;
};
} // namespace proxy_integration_tests_details
namespace details = proxy_integration_tests_details;
TEST(ProxyIntegrationTests, TestDrawable) {
pro::proxy<details::Drawable> p = details::MakeDrawableFromCommand("Rectangle 2 3");
std::string s = details::PrintDrawableToString(std::move(p));
ASSERT_EQ(s, "shape = {Rectangle: width = 2.00000, height = 3.00000}, area = 6.00000");
p = details::MakeDrawableFromCommand("Circle 1");
s = details::PrintDrawableToString(std::move(p));
ASSERT_EQ(s, "shape = {Circle: radius = 1.00000}, area = 3.14159");
p = details::MakeDrawableFromCommand("Point");
s = details::PrintDrawableToString(std::move(p));
ASSERT_EQ(s, "shape = {Point}, area = 0.00000");
try {
p = details::MakeDrawableFromCommand("Triangle 2 3");
} catch (const std::runtime_error& e) {
ASSERT_STREQ(e.what(), "Invalid command");
}
}
TEST(ProxyIntegrationTests, TestLogger) {
std::ostringstream out;
auto logger = pro::make_proxy<details::Logger, details::StreamLogger>(out);
logger->Log("hello");
try {
throw std::runtime_error{"runtime error!"};
} catch (const std::exception& e) {
logger->Log("world", e);
}
auto content = std::move(out).str();
ASSERT_EQ(content, "[INFO] hello\n\
[ERROR] world (exception info: runtime error!)\n");
}