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AK: Add JSON object/array for-each methods for fallible callbacks

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This allows the provided callback to return an ErrorOr-like type to
propagate errors back to the caller.
This commit is contained in:
Timothy Flynn 2022-11-17 08:15:01 -05:00 • committed by Linus Groh
parent 56ab529752
commit 13b18a182a
3 changed files with 129 additions and 0 deletions
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104
Tests/AK/TestJSON.cpp
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@ -267,3 +267,107 @@ TEST_CASE(json_parse_fails_on_invalid_number)
#undef EXPECT_JSON_PARSE_TO_FAIL
}
struct CustomError {
};
template<typename T>
class CustomErrorOr {
public:
CustomErrorOr(T)
: m_is_error(false)
{
}
CustomErrorOr(CustomError)
: m_is_error(true)
{
}
bool is_error() const { return m_is_error; }
CustomError release_error() { return CustomError {}; }
T release_value() { return T {}; }
private:
bool m_is_error { false };
};
TEST_CASE(fallible_json_object_for_each)
{
String raw_json = R"(
{
"name": "anon",
"home": "/home/anon",
"default_browser": "Ladybird"
})";
auto json = JsonValue::from_string(raw_json).value();
auto const& object = json.as_object();
MUST(object.try_for_each_member([](auto const&, auto const&) -> ErrorOr<void> {
return {};
}));
auto result1 = object.try_for_each_member([](auto const&, auto const&) -> ErrorOr<void> {
return Error::from_string_view("nanananana"sv);
});
EXPECT(result1.is_error());
EXPECT_EQ(result1.error().string_literal(), "nanananana"sv);
auto result2 = object.try_for_each_member([](auto const&, auto const&) -> ErrorOr<void, CustomError> {
return CustomError {};
});
EXPECT(result2.is_error());
EXPECT((IsSame<decltype(result2.release_error()), CustomError>));
auto result3 = object.try_for_each_member([](auto const&, auto const&) -> CustomErrorOr<int> {
return 42;
});
EXPECT(!result3.is_error());
auto result4 = object.try_for_each_member([](auto const&, auto const&) -> CustomErrorOr<int> {
return CustomError {};
});
EXPECT(result4.is_error());
EXPECT((IsSame<decltype(result4.release_error()), CustomError>));
}
TEST_CASE(fallible_json_array_for_each)
{
String raw_json = R"(
[
"anon",
"/home/anon",
"Ladybird"
])";
auto json = JsonValue::from_string(raw_json).value();
auto const& array = json.as_array();
MUST(array.try_for_each([](auto const&) -> ErrorOr<void> {
return {};
}));
auto result1 = array.try_for_each([](auto const&) -> ErrorOr<void> {
return Error::from_string_view("nanananana"sv);
});
EXPECT(result1.is_error());
EXPECT_EQ(result1.error().string_literal(), "nanananana"sv);
auto result2 = array.try_for_each([](auto const&) -> ErrorOr<void, CustomError> {
return CustomError {};
});
EXPECT(result2.is_error());
EXPECT((IsSame<decltype(result2.release_error()), CustomError>));
auto result3 = array.try_for_each([](auto const&) -> CustomErrorOr<int> {
return 42;
});
EXPECT(!result3.is_error());
auto result4 = array.try_for_each([](auto const&) -> CustomErrorOr<int> {
return CustomError {};
});
EXPECT(result4.is_error());
EXPECT((IsSame<decltype(result4.release_error()), CustomError>));
}