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#include "generator.hh"
#include <concepts>
#include <cstdint>
#include <gtest/gtest.h>
namespace nix {
TEST(Generator, yields)
{
auto g = []() -> Generator<int> {
co_yield 1;
co_yield 2;
}();
ASSERT_EQ(g.next(), 1);
ASSERT_EQ(g.next(), 2);
ASSERT_FALSE(g.next().has_value());
}
TEST(Generator, returns)
{
{
auto g = []() -> Generator<int> { co_return; }();
ASSERT_FALSE(g.next().has_value());
}
{
auto g = []() -> Generator<int> {
co_yield 1;
co_yield []() -> Generator<int> { co_return; }();
co_yield 2;
co_yield []() -> Generator<int> { co_yield 10; }();
co_yield 3;
(void) "dummy statement to force some more execution";
}();
ASSERT_EQ(g.next(), 1);
ASSERT_EQ(g.next(), 2);
ASSERT_EQ(g.next(), 10);
ASSERT_EQ(g.next(), 3);
ASSERT_FALSE(g.next().has_value());
}
}
TEST(Generator, nests)
{
auto g = []() -> Generator<int> {
co_yield 1;
co_yield []() -> Generator<int> {
co_yield 9;
co_yield []() -> Generator<int> {
co_yield 99;
co_yield 100;
}();
}();
auto g2 = []() -> Generator<int> {
co_yield []() -> Generator<int> {
co_yield 2000;
co_yield 2001;
}();
co_yield 1001;
}();
co_yield g2.next().value();
co_yield std::move(g2);
co_yield 2;
}();
ASSERT_EQ(g.next(), 1);
ASSERT_EQ(g.next(), 9);
ASSERT_EQ(g.next(), 99);
ASSERT_EQ(g.next(), 100);
ASSERT_EQ(g.next(), 2000);
ASSERT_EQ(g.next(), 2001);
ASSERT_EQ(g.next(), 1001);
ASSERT_EQ(g.next(), 2);
ASSERT_FALSE(g.next().has_value());
}
TEST(Generator, nestsExceptions)
{
auto g = []() -> Generator<int> {
co_yield 1;
co_yield []() -> Generator<int> {
co_yield 9;
// NOLINTNEXTLINE(hicpp-exception-baseclass)
throw 1;
co_yield 10;
}();
co_yield 2;
}();
ASSERT_EQ(g.next(), 1);
ASSERT_EQ(g.next(), 9);
ASSERT_THROW(g.next(), int);
}
TEST(Generator, exception)
{
{
auto g = []() -> Generator<int> {
co_yield 1;
// NOLINTNEXTLINE(hicpp-exception-baseclass)
throw 1;
}();
ASSERT_EQ(g.next(), 1);
ASSERT_THROW(g.next(), int);
ASSERT_FALSE(g.next().has_value());
}
{
auto g = []() -> Generator<int> {
// NOLINTNEXTLINE(hicpp-exception-baseclass)
throw 1;
co_return;
}();
ASSERT_THROW(g.next(), int);
ASSERT_FALSE(g.next().has_value());
}
}
namespace {
struct Transform
{
int state = 0;
std::pair<uint32_t, int> operator()(std::integral auto x)
{
return {x, state++};
}
Generator<std::pair<uint32_t, int>, Transform> operator()(const char *)
{
co_yield 9;
co_yield 19;
}
Generator<std::pair<uint32_t, int>, Transform> operator()(Generator<int> && inner)
{
return [](auto g) mutable -> Generator<std::pair<uint32_t, int>, Transform> {
while (auto i = g.next()) {
co_yield *i;
}
}(std::move(inner));
}
};
}
TEST(Generator, transform)
{
auto g = []() -> Generator<std::pair<uint32_t, int>, Transform> {
co_yield int32_t(-1);
co_yield "";
co_yield []() -> Generator<int> { co_yield 7; }();
co_yield 20;
}();
ASSERT_EQ(g.next(), (std::pair<unsigned, int>{4294967295, 0}));
ASSERT_EQ(g.next(), (std::pair<unsigned, int>{9, 0}));
ASSERT_EQ(g.next(), (std::pair<unsigned, int>{19, 1}));
ASSERT_EQ(g.next(), (std::pair<unsigned, int>{7, 0}));
ASSERT_EQ(g.next(), (std::pair<unsigned, int>{20, 1}));
ASSERT_FALSE(g.next().has_value());
}
namespace {
struct ThrowTransform
{
int operator()(int x)
{
return x;
}
int operator()(bool)
{
// NOLINTNEXTLINE(hicpp-exception-baseclass)
throw 2;
}
Generator<int, void> operator()(Generator<int> && inner)
{
// NOLINTNEXTLINE(hicpp-exception-baseclass)
throw false;
}
};
}
TEST(Generator, transformThrows)
{
{
auto g = []() -> Generator<int, ThrowTransform> {
co_yield 1;
co_yield false;
co_yield 2;
}();
ASSERT_EQ(g.next(), 1);
ASSERT_THROW(g.next(), int);
ASSERT_FALSE(g.next().has_value());
}
{
auto g = []() -> Generator<int, ThrowTransform> {
co_yield 1;
co_yield []() -> Generator<int> {
co_yield 2;
}();
co_yield 3;
}();
ASSERT_EQ(g.next(), 1);
ASSERT_THROW(g.next(), bool);
ASSERT_FALSE(g.next().has_value());
}
}
}
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