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proxy_integration_tests.cpp
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138 lines (121 loc) · 4.02 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
#include <gtest/gtest.h>
#include <iomanip>
#include <memory>
#include <memory_resource>
#include <numbers>
#include <sstream>
#include <string>
#include <vector>
#include "proxy.h"
namespace {
struct Draw : pro::dispatch<void(std::ostream&)> {
template <class T>
void operator()(const T& self, std::ostream& out) { self.Draw(out); }
};
struct Area : pro::dispatch<double()> {
template <class T>
double operator()(const T& self) { return self.Area(); }
};
struct DrawableFacade : pro::facade<Draw, Area> {};
class Rectangle {
public:
void Draw(std::ostream& out) const
{ out << "{Rectangle: width = " << width_ << ", height = " << height_ << "}"; }
void SetWidth(double width) { width_ = width; }
void SetHeight(double height) { height_ = height; }
double Area() const { return width_ * height_; }
private:
double width_;
double height_;
};
class Circle {
public:
void Draw(std::ostream& out) const { out << "{Circle: radius = " << radius_ << "}"; }
void SetRadius(double radius) { radius_ = radius; }
double Area() const { return std::numbers::pi * radius_ * radius_; }
private:
double radius_;
};
class Point {
public:
void Draw(std::ostream& out) const { out << "{Point}"; }
constexpr double Area() const { return 0; }
};
std::string PrintDrawableToString(pro::proxy<DrawableFacade> p) {
std::stringstream result;
result << std::fixed << std::setprecision(5) << "shape = ";
p.invoke<Draw>(result);
result << ", area = " << p.invoke<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<DrawableFacade> 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};
auto deleter = [alloc](Rectangle* ptr) mutable
{ alloc.delete_object<Rectangle>(ptr); };
Rectangle* instance = alloc.new_object<Rectangle>();
std::unique_ptr<Rectangle, decltype(deleter)> p{instance, deleter};
p->SetWidth(std::stod(parsed[1u]));
p->SetHeight(std::stod(parsed[2u]));
return p;
}
} else if (parsed[0u] == "Circle") {
if (parsed.size() == 2u) {
Circle circle;
circle.SetRadius(std::stod(parsed[1u]));
return pro::make_proxy<DrawableFacade>(circle);
}
} else if (parsed[0u] == "Point") {
if (parsed.size() == 1u) {
static Point instance;
return &instance;
}
}
}
throw std::runtime_error{"Invalid command"};
}
} // namespace
TEST(ProxyIntegrationTests, TestDrawable) {
pro::proxy<DrawableFacade
3F58
> p = MakeDrawableFromCommand("Rectangle 2 3");
std::string s = PrintDrawableToString(std::move(p));
ASSERT_EQ(s, "shape = {Rectangle: width = 2.00000, height = 3.00000}, area = 6.00000");
p = MakeDrawableFromCommand("Circle 1");
s = PrintDrawableToString(std::move(p));
ASSERT_EQ(s, "shape = {Circle: radius = 1.00000}, area = 3.14159");
p = MakeDrawableFromCommand("Point");
s = PrintDrawableToString(std::move(p));
ASSERT_EQ(s, "shape = {Point}, area = 0.00000");
try {
p = MakeDrawableFromCommand("Triangle 2 3");
} catch (const std::runtime_error& e) {
ASSERT_STREQ(e.what(), "Invalid command");
}
}