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Merge branch 'json-view/12-view-values' into json-view/13-view-dump

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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-29 22:45:09 +02:00
parent ecce914701 9549dce77b
commit 79bf60b44b
8 changed files with 80 additions and 23 deletions
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37
tests/src/unit-json_view.cpp
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@@ -39,6 +39,7 @@ using nlohmann::ordered_json_view;
namespace
{
#if !defined(JSON_NOEXCEPTION)
// the exception parse() throws for a text, or "" if it accepts it
std::string parse_exception(const std::string& text, bool comments = false, bool trailing_commas = false)
{
@@ -67,6 +68,7 @@ std::string view_exception(const std::string& text, bool comments = false, bool
}
return "";
}
#endif
// a small deterministic generator of documents
struct generator
@@ -156,7 +158,7 @@ TEST_CASE("json_view")
CHECK(v.materialize() == j);
}
const json_view invalid;
const json_view invalid{};
CHECK(invalid.is_discarded());
CHECK(!static_cast<bool>(invalid));
CHECK(invalid.type() == json::value_t::discarded);
@@ -201,9 +203,11 @@ TEST_CASE("json_view")
})
{
CAPTURE(text);
#if !defined(JSON_NOEXCEPTION)
const std::string expected = parse_exception(text);
REQUIRE(!expected.empty());
CHECK(view_exception(text) == expected);
#endif
CHECK(!json_document::accept(text));
const json_document d = json_document::parse(text, false);
CHECK(d.is_discarded());
@@ -211,8 +215,9 @@ TEST_CASE("json_view")
CHECK(d.node_count() == 0);
}
// the exception types
CHECK_THROWS_AS(json_document::parse("[1,"), json::parse_error&);
CHECK_THROWS_AS(json_document::parse("1e400"), json::out_of_range&);
json_document _;
CHECK_THROWS_AS(_ = json_document::parse("[1,"), json::parse_error&);
CHECK_THROWS_AS(_ = json_document::parse("1e400"), json::out_of_range&);
}
SECTION("parse options")
@@ -227,7 +232,9 @@ TEST_CASE("json_view")
const bool comments = (options & 1) != 0;
const bool trailing_commas = (options & 2) != 0;
CHECK(json_document::accept(text, comments, trailing_commas) == json::accept(text, comments, trailing_commas));
#if !defined(JSON_NOEXCEPTION)
CHECK(view_exception(text, comments, trailing_commas) == parse_exception(text, comments, trailing_commas));
#endif
}
}
}
@@ -239,7 +246,9 @@ TEST_CASE("json_view")
const std::string nul_in_comment("[1, // c\0\n2]", 12);
CHECK(json_document::accept(nul_in_comment, true) == json::accept(nul_in_comment, true));
CHECK(json_document::parse("\xEF\xBB\xBF[1]").root().materialize() == json::parse("\xEF\xBB\xBF[1]"));
#if !defined(JSON_NOEXCEPTION)
CHECK(view_exception("\xEF\xBB") == parse_exception("\xEF\xBB"));
#endif
}
SECTION("inputs")
@@ -385,6 +394,7 @@ TEST_CASE("json_view")
namespace
{
#if !defined(JSON_NOEXCEPTION)
// the exception a call throws, or "" if it throws none
template<typename F>
std::string exception_of(F f)
@@ -399,6 +409,7 @@ std::string exception_of(F f)
}
return "";
}
#endif
// compares a view with the ordered_json value materialize() gives for it:
// types, sizes, elements and members (by index, key, and iteration), in
@@ -567,6 +578,7 @@ TEST_CASE("json_view element access and iteration")
const json_document d = json_document::parse(text);
const json_view v = d.root();
const json j = v.materialize();
#if !defined(JSON_NOEXCEPTION)
if (!j.is_object())
{
CHECK(exception_of([&] { static_cast<void>(v["a"]); }) == exception_of([&] { static_cast<void>(j["a"]); }));
@@ -588,6 +600,7 @@ TEST_CASE("json_view element access and iteration")
CHECK(exception_of([&] { static_cast<void>(v.front()); }) == exception_of([&] { static_cast<void>(j.front()); }));
CHECK(exception_of([&] { static_cast<void>(v.back()); }) == exception_of([&] { static_cast<void>(j.back()); }));
}
#endif
CHECK(v.contains("a") == j.contains("a"));
CHECK(v.count("a") == j.count("a"));
CHECK((v.find("a") == v.end()) == (j.find("a") == j.end())); // NOLINT(readability-container-contains): find() is what is tested
@@ -599,7 +612,7 @@ TEST_CASE("json_view element access and iteration")
CHECK(!d.root()["a"][0]);
CHECK_THROWS_WITH_AS(d.root()["a"].front(), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(d.root()["a"].back(), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
const json_view invalid;
const json_view invalid{};
CHECK(invalid.begin() == invalid.end());
CHECK(std::string(invalid.type_name()) == "discarded");
CHECK_THROWS_WITH_AS(invalid["a"], "[json.exception.type_error.305] cannot use operator[] with a string argument with discarded", json::type_error&);
@@ -659,6 +672,7 @@ TEST_CASE("json_view element access and iteration")
namespace
{
#if !defined(JSON_NOEXCEPTION)
// an exception message without the context that basic_json adds with
// JSON_DIAGNOSTICS ("(/path) ") and JSON_DIAGNOSTIC_POSITIONS ("(bytes 1-2) ");
// the view's exceptions have no such context
@@ -676,6 +690,7 @@ std::string without_path(std::string msg)
}
return msg;
}
#endif
// the bits of a float, to compare values bit for bit
std::uint64_t bits(double x)
@@ -755,6 +770,7 @@ void check_values(const ordered_json_view& v, const ordered_json& j, const std::
break;
}
#if !defined(JSON_NOEXCEPTION)
// conversions to the wrong type throw what basic_json throws
if (!j.is_number())
{
@@ -771,6 +787,7 @@ void check_values(const ordered_json_view& v, const ordered_json& j, const std::
{
CHECK(exception_of([&] { static_cast<void>(v.get<std::map<std::string, int>>()); }) == without_path(exception_of([&] { static_cast<void>(j.get<std::map<std::string, int>>()); })));
}
#endif
if (v.is_array())
{
@@ -926,7 +943,7 @@ TEST_CASE("json_view values")
// a duplicate key: the last value, as parse()
CHECK((json_document::parse(R"({"a":1,"a":2})").root().get<std::map<std::string, int>>() == std::map<std::string, int> {{"a", 2}}));
const json_view invalid;
const json_view invalid{};
CHECK_THROWS_WITH_AS(invalid.get<int>(), "[json.exception.type_error.302] type must be number, but is discarded", json::type_error&);
CHECK(invalid.get<json>().is_discarded());
}
@@ -947,10 +964,12 @@ TEST_CASE("json_view values")
// with a JSON pointer, arrays can be asked as well
CHECK(v["o"]["x"].value(json::json_pointer("/1"), 0) == j["o"]["x"].value(json::json_pointer("/1"), 0));
CHECK(v["o"]["x"].value(json::json_pointer("/7"), 3) == j["o"]["x"].value(json::json_pointer("/7"), 3));
#if !defined(JSON_NOEXCEPTION)
CHECK(exception_of([&] { static_cast<void>(v["o"]["x"].value("k", 0)); }) == without_path(exception_of([&] { static_cast<void>(j["o"]["x"].value("k", 0)); })));
CHECK(exception_of([&] { static_cast<void>(v.value("s", 0)); }) == without_path(exception_of([&] { static_cast<void>(j.value("s", 0)); })));
CHECK(exception_of([&] { static_cast<void>(v["n"].value("x", 0)); }) == without_path(exception_of([&] { static_cast<void>(j["n"].value("x", 0)); })));
CHECK(exception_of([&] { static_cast<void>(v["n"].value(json::json_pointer("/x"), 0)); }) == without_path(exception_of([&] { static_cast<void>(j["n"].value(json::json_pointer("/x"), 0)); })));
#endif
}
}
@@ -989,6 +1008,7 @@ TEST_CASE("json_view JSON pointers")
}
}
#if !defined(JSON_NOEXCEPTION)
SECTION("errors are those of basic_json")
{
const std::string text = R"({"a": [1, {"b": null}], "c": "s", "": {"": 0}, "a~b": 1, "c/d": 2})";
@@ -1021,11 +1041,16 @@ TEST_CASE("json_view JSON pointers")
// (basic_json::contains() throws out_of_range.404 for an empty
// array index token, although it is not meant to throw; the view
// answers false)
const std::string contains_error = exception_of([&] { static_cast<void>(j.contains(p)); });
const std::string contains_error = exception_of([&]
{
const bool found = j.contains(p);
static_cast<void>(found);
});
CHECK(v.contains(p) == (contains_error.empty() && j.contains(p)));
CHECK(exception_of([&] { static_cast<void>(v.value(p, 5)); }) == without_path(exception_of([&] { static_cast<void>(j.value(p, 5)); })));
}
}
#endif
}
TEST_CASE("json_view dump")