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json/tests/src/unit-regression1.cpp
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Niels Lohmann 78a0687147 Strong exception guarantee for operator[](json_pointer) (#5940) 
* Keep the value unchanged when operator[] with a JSON pointer throws

The non-const operator[](json_pointer) is documented with strong exception
safety, but get_unchecked created intermediate values while walking the
pointer and kept them when a later reference token failed, e.g.
json j; j["/a/99999999999999999999999"_json_pointer] threw 404 and left
{"a":[]}; padding an existing array or appending with "-" behaved alike,
and so did std::length_error/std::bad_alloc from a huge index.

get_unchecked now only walks existing values up to the last reference
token. The last token's key insertion or array growth is strongly
exception safe by itself. Any other change goes through
get_unchecked_create, which records the one change it makes to an existing
value (null converted, key inserted, array grown) in a RAII guard and
reverts it if a later step throws; everything else it creates lies below
that change. The guard needs no try/catch, so JSON_NOEXCEPTION builds are
unaffected. Successful calls create the same values as before.

Docs: state the guarantee in the exceptions list and version history of
operator[], fix the complexity of the pointer overloads of operator[] and
at, and warn that padding arrays up to an untrusted index allocates memory
proportional to the index (operator[].md, untrusted_input.md).

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Make the strongly exception-safe pointer operator[] faster than before

The previous commit made get_unchecked strongly exception safe but slower
with GCC 16 when it creates values (up to +6 % instructions for appending
with "-"). This restructures it so that no benchmark row is slower than
before the strong guarantee, with GCC 16, Clang 22 and Apple Clang.

- get_unchecked walks existing values in one loop that inserts nothing.
  The last reference token is resolved in that walk: "-" appends with
  emplace_back(), an index grows the array with operator[], and a missing
  key is inserted with emplace_hint() at the position the walk's
  lower_bound() found, so the key is searched once.
- With std::less<string_t> or std::less<> as comparator, the walk checks
  the key at the lower bound for equality instead of equivalence, which is
  the same for these comparators and cheaper.
- get_unchecked_create (not inlined) handles all other changes. Its guard
  swaps a null value with a fresh null value instead of copying it and
  reverts the change in a non-inlined function, so a successful call pays
  one compare for it. As every null value converted afterwards is a fresh
  one, it is converted in place instead of assigning a new array or object.
- Keys are added to new objects with emplace(), which also replaces the
  basic_json::operator[] call for ordered_json.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Fix rollback of pointer operator[] for unusual object and string types

Follow-up to the strong exception guarantee of the non-const
operator[](json_pointer):

- get_unchecked_create assumed that emplace() always inserts the key that
  the walk did not find. For object types whose lookup and emplace()
  disagree (e.g. a copied fifo_map), nothing was inserted, the rollback
  erased the existing member, and the walk continued with a value of the
  wrong type (assertion, type_error.305, or a crash). It now checks the
  result of emplace(), arms the rollback only if a key was inserted, and
  otherwise continues the walk with the member found, as basic_json's
  operator[] does: such pointers throw out_of_range.404 and leave the value
  unchanged, as before the strong guarantee.
- The rollback erased the inserted key by key, which converts string_t to
  object_t::key_type and may allocate inside a noexcept function
  (std::terminate on bad_alloc with custom key types). It now erases by the
  iterator emplace() returned, and shrinks a grown array with erase() at
  the end instead of resize(). The documentation states the remaining
  requirement for custom template parameters.
- Creating values no longer calls string_t::begin(), so the non-const
  operator[](json_pointer) compiles with string types that lack it (as the
  alternative string type of the tests).
- Correct the @throw lists of get_unchecked and get_unchecked_create.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Address review comments on operator[](json_pointer) rollback

- undo() shrinks the array with resize() instead of erase()
- comments say what "will be" done in get_unchecked_create
- tests: avoid a clang-tidy performance-unnecessary-copy-initialization
  hit (unit-alt-string) and the word "access" in section names, which
  Flawfinder flags as race/access

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Let the pointer rollback guard call undo() unconditionally

The check in the destructor and JSON_HEDLEY_NEVER_INLINE on undo() made no
measurable difference: instruction counts of j[ptr] are identical with
GCC 13 -O3 and within 0.4 % with clang, timings are within noise.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

---------

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
2026-10-27 17:15:55 +01:00

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// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++ (supporting code)
// | | |__ | | | | | | version 3.12.0
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
// SPDX-License-Identifier: MIT
#include "doctest_compatibility.h"
// for some reason including this after the json header leads to linker errors with VS 2017...
#include <locale>
// skip tests if JSON_DisableEnumSerialization=ON (#4384)
#if defined(JSON_DISABLE_ENUM_SERIALIZATION) && (JSON_DISABLE_ENUM_SERIALIZATION == 1)
#define SKIP_TESTS_FOR_ENUM_SERIALIZATION
#endif
#define JSON_TESTS_PRIVATE
#include <nlohmann/json.hpp>
using nlohmann::json;
#ifdef JSON_TEST_NO_GLOBAL_UDLS
using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
#endif
#include <fstream>
#include <sstream>
#include <list>
#include <limits>
#include <cstdio>
#include "make_test_data_available.hpp"
#include "test_utils.hpp"
#include "fifo_map.hpp"
/////////////////////////////////////////////////////////////////////
// for #972
/////////////////////////////////////////////////////////////////////
template<class K, class V, class dummy_compare, class A>
using my_workaround_fifo_map = nlohmann::fifo_map<K, V, nlohmann::fifo_map_compare<K>, A>;
using my_json = nlohmann::json::with_object_t<my_workaround_fifo_map>;
/////////////////////////////////////////////////////////////////////
// for #977
/////////////////////////////////////////////////////////////////////
namespace ns
{
struct foo
{
int x;
};
template <typename, typename SFINAE = void>
struct foo_serializer;
template<typename T>
struct foo_serializer<T, typename std::enable_if<std::is_same<foo, T>::value>::type>
{
template <typename BasicJsonType>
static void to_json(BasicJsonType& j, const T& value)
{
j = BasicJsonType{{"x", value.x}};
}
template <typename BasicJsonType>
static void from_json(const BasicJsonType& j, T& value) // !!!
{
nlohmann::from_json(j.at("x"), value.x);
}
};
template<typename T>
struct foo_serializer < T, typename std::enable_if < !std::is_same<foo, T>::value >::type >
{
template <typename BasicJsonType>
static void to_json(BasicJsonType& j, const T& value) noexcept // NOLINT(bugprone-exception-escape)
{
::nlohmann::to_json(j, value);
}
template <typename BasicJsonType>
static void from_json(const BasicJsonType& j, T& value) //!!!
{
::nlohmann::from_json(j, value);
}
};
} // namespace ns
using foo_json = nlohmann::json::with_json_serializer_t<ns::foo_serializer>;
/////////////////////////////////////////////////////////////////////
// for #805
/////////////////////////////////////////////////////////////////////
namespace
{
struct nocopy // NOLINT(cppcoreguidelines-special-member-functions,hicpp-special-member-functions)
{
nocopy() = default;
nocopy(const nocopy&) = delete;
nocopy(nocopy&&) = delete;
nocopy& operator=(const nocopy&) = delete;
nocopy& operator=(nocopy&&) = delete;
int val = 0;
friend void to_json(json& j, const nocopy& n)
{
j = {{"val", n.val}};
}
};
} // namespace
TEST_CASE("regression tests 1")
{
SECTION("issue #60 - Double quotation mark is not parsed correctly")
{
SECTION("escape_doublequote")
{
const auto* s = R"(["\"foo\""])";
const json j = json::parse(s);
auto expected = R"(["\"foo\""])"_json;
CHECK(j == expected);
}
}
SECTION("issue #70 - Handle infinity and NaN cases")
{
// previously, NAN/INFINITY created a null value; now, the values are
// properly stored, but are dumped as "null"
SECTION("NAN value")
{
CHECK(json(NAN).dump() == "null");
CHECK(json(json::number_float_t(NAN)).dump() == "null");
}
SECTION("infinity")
{
CHECK(json(INFINITY).dump() == "null");
CHECK(json(json::number_float_t(INFINITY)).dump() == "null");
}
// With 3.0.0, the semantics of this changed: NAN and infinity are
// stored properly inside the JSON value (no exception or conversion
// to null), but are serialized as null.
SECTION("NAN value")
{
json const j1 = NAN;
CHECK(j1.is_number_float());
json::number_float_t const f1{j1};
CHECK(std::isnan(f1));
json const j2 = static_cast<json::number_float_t>(NAN);
CHECK(j2.is_number_float());
json::number_float_t const f2{j2};
CHECK(std::isnan(f2));
}
SECTION("infinity")
{
json const j1 = INFINITY;
CHECK(j1.is_number_float());
json::number_float_t const f1{j1};
CHECK(!std::isfinite(f1));
json const j2 = static_cast<json::number_float_t>(INFINITY);
CHECK(j2.is_number_float());
json::number_float_t const f2{j2};
CHECK(!std::isfinite(f2));
}
}
#ifndef SKIP_TESTS_FOR_ENUM_SERIALIZATION
SECTION("pull request #71 - handle enum type")
{
enum { t = 0, u = 102}; // NOLINT(cppcoreguidelines-use-enum-class)
json j = json::array();
j.push_back(t);
// maybe this is not the place to test this?
const json j2 = u;
auto anon_enum_value = j2.get<decltype(u)>();
CHECK(u == anon_enum_value);
// check if the actual value was stored
CHECK(j2 == 102);
static_assert(std::is_same<decltype(anon_enum_value), decltype(u)>::value, "types must be the same");
j.push_back(json::object(
{
{"game_type", t}
}));
}
#endif
SECTION("issue #76 - dump() / parse() not idempotent")
{
// create JSON object
json fields;
fields["one"] = std::string("one");
fields["two"] = std::string("two three");
fields["three"] = std::string("three \"four\"");
// create another JSON object by deserializing the serialization
std::string const payload = fields.dump();
json parsed_fields = json::parse(payload);
// check individual fields to match both objects
CHECK(parsed_fields["one"] == fields["one"]);
CHECK(parsed_fields["two"] == fields["two"]);
CHECK(parsed_fields["three"] == fields["three"]);
// check individual fields to match original input
CHECK(parsed_fields["one"] == std::string("one"));
CHECK(parsed_fields["two"] == std::string("two three"));
CHECK(parsed_fields["three"] == std::string("three \"four\""));
// check equality of the objects
CHECK(parsed_fields == fields);
// check equality of the serialized objects
CHECK(fields.dump() == parsed_fields.dump());
// check everything in one line
CHECK(fields == json::parse(fields.dump()));
}
SECTION("issue #82 - lexer::get_number return NAN")
{
const auto* const content = R"(
{
"Test":"Test1",
"Number":100,
"Foo":42.42
})";
std::stringstream ss;
ss << content;
json j;
ss >> j;
auto test = j["Test"].get<std::string>();
CHECK(test == "Test1");
const int number{j["Number"]};
CHECK(number == 100);
const float foo{j["Foo"]};
CHECK(static_cast<double>(foo) == Approx(42.42));
}
SECTION("issue #89 - nonstandard integer type")
{
// create JSON class with nonstandard integer number type
using custom_json =
nlohmann::json::with_integers_t<std::int32_t, std::uint32_t>::with_float_t<float>;
custom_json j;
j["int_1"] = 1;
CHECK(j["int_1"] == 1);
// tests for correct handling of non-standard integers that overflow the type selected by the user
// unsigned integer object creation - expected to wrap and still be stored as an integer
j = 4294967296U; // 2^32
CHECK(static_cast<int>(j.type()) == static_cast<int>(custom_json::value_t::number_unsigned));
CHECK(j.get<uint32_t>() == 0); // Wrap
// unsigned integer parsing - expected to overflow and be stored as a float
j = custom_json::parse("4294967296"); // 2^32
CHECK(static_cast<int>(j.type()) == static_cast<int>(custom_json::value_t::number_float));
CHECK(j.get<float>() == 4294967296.0f);
// integer object creation - expected to wrap and still be stored as an integer
j = -2147483649LL; // -2^31-1
CHECK(static_cast<int>(j.type()) == static_cast<int>(custom_json::value_t::number_integer));
CHECK(j.get<int32_t>() == 2147483647); // Wrap
// integer parsing - expected to overflow and be stored as a float with rounding
j = custom_json::parse("-2147483649"); // -2^31
CHECK(static_cast<int>(j.type()) == static_cast<int>(custom_json::value_t::number_float));
CHECK(j.get<float>() == -2147483650.0f);
}
SECTION("issue #93 reverse_iterator operator inheritance problem")
{
{
json a = {1, 2, 3};
json::reverse_iterator rit = a.rbegin();
++rit;
CHECK(*rit == json(2));
CHECK(rit.value() == json(2));
}
{
json a = {1, 2, 3};
json::reverse_iterator const rit = ++a.rbegin();
CHECK(*rit == json(2));
CHECK(rit.value() == json(2));
}
{
json a = {1, 2, 3};
json::reverse_iterator rit = a.rbegin();
++rit;
json b = {0, 0, 0};
std::transform(rit, a.rend(), b.rbegin(), [](json el)
{
return el;
});
CHECK(b == json({0, 1, 2}));
}
{
json a = {1, 2, 3};
json b = {0, 0, 0};
std::transform(++a.rbegin(), a.rend(), b.rbegin(), [](json el)
{
return el;
});
CHECK(b == json({0, 1, 2}));
}
}
SECTION("issue #100 - failed to iterator json object with reverse_iterator")
{
json config =
{
{ "111", 111 },
{ "112", 112 },
{ "113", 113 }
};
std::stringstream ss;
for (auto it = config.begin(); it != config.end(); ++it)
{
ss << it.key() << ": " << it.value() << '\n';
}
for (auto it = config.rbegin(); it != config.rend(); ++it)
{
ss << it.key() << ": " << it.value() << '\n';
}
CHECK(ss.str() == "111: 111\n112: 112\n113: 113\n113: 113\n112: 112\n111: 111\n");
}
SECTION("issue #101 - binary string causes numbers to be dumped as hex")
{
int64_t const number = 10;
std::string const bytes{"\x00" "asdf\n", 6};
json j;
j["int64"] = number;
j["binary string"] = bytes;
// make sure the number is really printed as decimal "10" and not as
// hexadecimal "a"
CHECK(j.dump() == "{\"binary string\":\"\\u0000asdf\\n\",\"int64\":10}");
}
SECTION("issue #111 - subsequent unicode chars")
{
std::string const bytes{0x7, 0x7};
json j;
j["string"] = bytes;
CHECK(j["string"] == "\u0007\u0007");
}
#if JSON_USE_IMPLICIT_CONVERSIONS
SECTION("issue #144 - implicit assignment to std::string fails")
{
json o = {{"name", "value"}};
const std::string s1 = o["name"];
CHECK(s1 == "value");
std::string s2;
s2 = o["name"];
CHECK(s2 == "value");
// improve coverage
o["int"] = 1;
#if JSON_DIAGNOSTICS
CHECK_THROWS_WITH_AS(s2 = o["int"], "[json.exception.type_error.302] (/int) type must be string, but is number", json::type_error);
#else
CHECK_THROWS_WITH_AS(s2 = o["int"], "[json.exception.type_error.302] type must be string, but is number", json::type_error);
#endif
}
#endif
SECTION("issue #146 - character following a surrogate pair is skipped")
{
CHECK(json::parse("\"\\ud80c\\udc60abc\"").get<json::string_t>() == "\xf0\x93\x81\xa0\x61\x62\x63");
}
SECTION("issue #171 - Cannot index by key of type static constexpr const char*")
{
json j;
// Non-const access with key as "char []"
char array_key[] = "Key1"; // NOLINT(cppcoreguidelines-avoid-c-arrays,hicpp-avoid-c-arrays,modernize-avoid-c-arrays)
CHECK_NOTHROW(j[array_key] = 1);
CHECK(j[array_key] == json(1));
// Non-const access with key as "const char[]"
const char const_array_key[] = "Key2"; // NOLINT(cppcoreguidelines-avoid-c-arrays,hicpp-avoid-c-arrays,modernize-avoid-c-arrays)
CHECK_NOTHROW(j[const_array_key] = 2);
CHECK(j[const_array_key] == json(2));
// Non-const access with key as "char *"
char _ptr_key[] = "Key3"; // NOLINT(cppcoreguidelines-avoid-c-arrays,hicpp-avoid-c-arrays,modernize-avoid-c-arrays)
char* ptr_key = &_ptr_key[0]; // NOLINT(cppcoreguidelines-pro-type-vararg,hicpp-vararg)
CHECK_NOTHROW(j[ptr_key] = 3);
CHECK(j[ptr_key] == json(3));
// Non-const access with key as "const char *"
const char* const_ptr_key = "Key4";
CHECK_NOTHROW(j[const_ptr_key] = 4);
CHECK(j[const_ptr_key] == json(4));
// Non-const access with key as "static constexpr const char *"
static constexpr const char* constexpr_ptr_key = "Key5";
CHECK_NOTHROW(j[constexpr_ptr_key] = 5);
CHECK(j[constexpr_ptr_key] == json(5));
const json j_const = j;
// Const access with key as "char []"
CHECK(j_const[array_key] == json(1));
// Const access with key as "const char[]"
CHECK(j_const[const_array_key] == json(2));
// Const access with key as "char *"
CHECK(j_const[ptr_key] == json(3));
// Const access with key as "const char *"
CHECK(j_const[const_ptr_key] == json(4));
// Const access with key as "static constexpr const char *"
CHECK(j_const[constexpr_ptr_key] == json(5));
}
SECTION("issue #186 miloyip/nativejson-benchmark: floating-point parsing")
{
json j;
j = json::parse("-0.0");
CHECK(j.get<double>() == -0.0);
j = json::parse("2.22507385850720113605740979670913197593481954635164564e-308");
CHECK(j.get<double>() == 2.2250738585072009e-308);
j = json::parse("0.999999999999999944488848768742172978818416595458984374");
CHECK(j.get<double>() == 0.99999999999999989);
j = json::parse("1.00000000000000011102230246251565404236316680908203126");
CHECK(j.get<double>() == 1.00000000000000022);
j = json::parse("7205759403792793199999e-5");
CHECK(j.get<double>() == 72057594037927928.0);
j = json::parse("922337203685477529599999e-5");
CHECK(j.get<double>() == 9223372036854774784.0);
j = json::parse("1014120480182583464902367222169599999e-5");
CHECK(j.get<double>() == 10141204801825834086073718800384.0);
j = json::parse("5708990770823839207320493820740630171355185151999e-3");
CHECK(j.get<double>() == 5708990770823838890407843763683279797179383808.0);
// create JSON class with nonstandard float number type
// float
nlohmann::json::with_integers_t<std::int32_t, std::uint32_t>::with_float_t<float> const j_float =
1.23e25f;
CHECK(j_float.get<float>() == 1.23e25f);
// double
nlohmann::json const j_double =
1.23e35;
CHECK(j_double.get<double>() == 1.23e35);
// long double
nlohmann::json::with_float_t<long double> const j_long_double = 1.23e45L;
CHECK(j_long_double.get<long double>() == 1.23e45L);
}
SECTION("issue #228 - double values are serialized with commas as decimal points")
{
json const j1a = 2312.42;
json const j1b = json::parse("2312.42");
json const j2a = 2342e-2;
//issue #230
//json j2b = json::parse("2342e-2");
json const j3a = 10E3;
json const j3b = json::parse("10E3");
json const j3c = json::parse("10e3");
// class to create a locale that would use a comma for decimals
class CommaDecimalSeparator : public std::numpunct<char>
{
protected:
char do_decimal_point() const override
{
return ',';
}
char do_thousands_sep() const override
{
return '.';
}
std::string do_grouping() const override
{
return "\03";
}
};
// change locale to mess with decimal points
auto orig_locale = std::locale::global(std::locale(std::locale(), new CommaDecimalSeparator));
CHECK(j1a.dump() == "2312.42");
CHECK(j1b.dump() == "2312.42");
// check if locale is properly reset
std::stringstream ss;
ss.imbue(std::locale(std::locale(), new CommaDecimalSeparator));
ss << 4712.11;
CHECK(ss.str() == "4.712,11");
ss << j1a;
CHECK(ss.str() == "4.712,112312.42");
ss << 47.11;
CHECK(ss.str() == "4.712,112312.4247,11");
CHECK(j2a.dump() == "23.42");
//issue #230
//CHECK(j2b.dump() == "23.42");
CHECK(j3a.dump() == "10000.0");
CHECK(j3b.dump() == "10000.0");
CHECK(j3c.dump() == "10000.0");
//CHECK(j3b.dump() == "1E04"); // roundtrip error
//CHECK(j3c.dump() == "1e04"); // roundtrip error
std::locale::global(orig_locale);
}
SECTION("issue #378 - locale-independent num-to-str")
{
static_cast<void>(setlocale(LC_NUMERIC, "de_DE.UTF-8"));
// verify that dumped correctly with '.' and no grouping
const json j1 = 12345.67;
CHECK(json(12345.67).dump() == "12345.67");
static_cast<void>(setlocale(LC_NUMERIC, "C"));
}
SECTION("issue #379 - locale-independent str-to-num")
{
static_cast<void>(setlocale(LC_NUMERIC, "de_DE.UTF-8"));
// verify that parsed correctly despite using strtod internally
CHECK(json::parse("3.14").get<double>() == 3.14);
// check a different code path
CHECK(json::parse("1.000000000000000000000000000000000000000000000000000000000000000000000000").get<double>() == 1.0);
}
SECTION("issue #233 - Can't use basic_json::iterator as a base iterator for std::move_iterator")
{
json source = {"a", "b", "c"};
json expected = {"a", "b"};
json dest;
std::copy_n(std::make_move_iterator(source.begin()), 2, std::back_inserter(dest));
CHECK(dest == expected);
}
SECTION("issue #235 - ambiguous overload for 'push_back' and 'operator+='")
{
json data = {{"key", "value"}};
data.push_back({"key2", "value2"});
data += {"key3", "value3"};
CHECK(data == json({{"key", "value"}, {"key2", "value2"}, {"key3", "value3"}}));
}
SECTION("issue #269 - diff generates incorrect patch when removing multiple array elements")
{
json const doc = R"( { "arr1": [1, 2, 3, 4] } )"_json;
json expected = R"( { "arr1": [1, 2] } )"_json;
// check roundtrip
CHECK(doc.patch(json::diff(doc, expected)) == expected);
}
SECTION("issue #283 - value() does not work with _json_pointer types")
{
json j =
{
{"object", {{"key1", 1}, {"key2", 2}}},
};
const int at_integer{j.at("/object/key2"_json_pointer)};
const int val_integer = j.value("/object/key2"_json_pointer, 0);
CHECK(at_integer == val_integer);
}
SECTION("issue #304 - Unused variable warning")
{
// code triggered a "warning: unused variable" warning and is left
// here to avoid the warning in the future
json object;
json const patch = json::array();
object = object.patch(patch);
}
SECTION("issue #306 - Parsing fails without space at end of file")
{
for (const auto* filename :
{
TEST_DATA_DIRECTORY "/regression/broken_file.json",
TEST_DATA_DIRECTORY "/regression/working_file.json"
})
{
CAPTURE(filename)
json j;
std::ifstream f(filename);
CHECK_NOTHROW(f >> j);
}
}
SECTION("issue #310 - make json_benchmarks no longer working in 2.0.4")
{
for (const auto* filename :
{
TEST_DATA_DIRECTORY "/regression/floats.json",
TEST_DATA_DIRECTORY "/regression/signed_ints.json",
TEST_DATA_DIRECTORY "/regression/unsigned_ints.json",
TEST_DATA_DIRECTORY "/regression/small_signed_ints.json"
})
{
CAPTURE(filename)
json j;
std::ifstream f(filename);
CHECK_NOTHROW(f >> j);
}
}
SECTION("issue #323 - add nested object capabilities to pointers")
{
json j;
j["/this/that/2"_json_pointer] = 27;
CHECK(j == json({{"this", {{"that", {nullptr, nullptr, 27}}}}}));
}
SECTION("issue #329 - serialized value not always can be parsed")
{
json _;
CHECK_THROWS_WITH_AS(_ = json::parse("22e2222"), "[json.exception.out_of_range.406] number overflow parsing '22e2222'", json::out_of_range&);
}
SECTION("issue #360 - Loss of precision when serializing <double>")
{
auto check_roundtrip = [](double number)
{
CAPTURE(number)
json j = number;
CHECK(j.is_number_float());
std::stringstream ss;
ss << j;
CHECK_NOTHROW(ss >> j);
CHECK(j.is_number_float());
CHECK(j.get<json::number_float_t>() == number);
};
check_roundtrip(100000000000.1236);
check_roundtrip((std::numeric_limits<json::number_float_t>::max)());
// Some more numbers which fail to roundtrip when serialized with digits10 significand digits (instead of max_digits10)
check_roundtrip(1.541888611948064e-17);
check_roundtrip(5.418771028591015e-16);
check_roundtrip(9.398685592608595e-15);
check_roundtrip(8.826843952762347e-14);
check_roundtrip(8.143291313475335e-13);
check_roundtrip(4.851328172762508e-12);
check_roundtrip(6.677850998084358e-11);
check_roundtrip(3.995398518174525e-10);
check_roundtrip(1.960452605645124e-9);
check_roundtrip(3.551812586302883e-8);
check_roundtrip(2.947988411689261e-7);
check_roundtrip(8.210166748056192e-6);
check_roundtrip(6.104889704266753e-5);
check_roundtrip(0.0008629954631330876);
check_roundtrip(0.004936993881051611);
check_roundtrip(0.08309725102608073);
check_roundtrip(0.5210494268499783);
check_roundtrip(6.382927930939767);
check_roundtrip(59.94947245358671);
check_roundtrip(361.0838651266122);
check_roundtrip(4678.354596181877);
check_roundtrip(61412.17658956043);
check_roundtrip(725696.0799057782);
check_roundtrip(2811732.583399828);
check_roundtrip(30178351.07533605);
check_roundtrip(689684880.3235844);
check_roundtrip(5714887673.555147);
check_roundtrip(84652038821.18808);
check_roundtrip(156510583431.7721);
check_roundtrip(5938450569021.732);
check_roundtrip(83623297654460.33);
check_roundtrip(701466573254773.6);
check_roundtrip(1369013370304513);
check_roundtrip(96963648023094720); // NOLINT(bugprone-narrowing-conversions,cppcoreguidelines-narrowing-conversions)
check_roundtrip(3.478237409280108e+17);
}
SECTION("issue #366 - json::parse on failed stream gets stuck")
{
std::ifstream f("file_not_found.json");
json _;
CHECK_THROWS_WITH_AS(_ = json::parse(f), "[json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON", json::parse_error&);
}
SECTION("issue #367 - calling stream at EOF")
{
std::stringstream ss;
json j;
ss << "123";
CHECK_NOTHROW(ss >> j);
// see https://github.com/nlohmann/json/issues/367#issuecomment-262841893:
// ss is not at EOF; this yielded an error before the fix
// (threw basic_string::append). No, it should just throw
// a parse error because of the EOF.
CHECK_THROWS_WITH_AS(ss >> j, "[json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON", json::parse_error&);
}
SECTION("issue #367 - behavior of operator>> should more closely resemble that of built-in overloads")
{
SECTION("(empty)")
{
std::stringstream ss;
json j;
CHECK_THROWS_WITH_AS(ss >> j, "[json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON", json::parse_error&);
}
SECTION("(whitespace)")
{
std::stringstream ss;
ss << " ";
json j;
CHECK_THROWS_WITH_AS(ss >> j,
"[json.exception.parse_error.101] parse error at line 1, column 4: syntax error while parsing value - unexpected end of input; expected '[', '{', or a literal", json::parse_error&);
}
SECTION("one value")
{
std::stringstream ss;
ss << "111";
json j;
CHECK_NOTHROW(ss >> j);
CHECK(j == 111);
CHECK_THROWS_WITH_AS(ss >> j, "[json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON", json::parse_error&);
}
SECTION("one value + whitespace")
{
std::stringstream ss;
ss << "222 \t\n";
json j;
CHECK_NOTHROW(ss >> j);
CHECK(j == 222);
CHECK_THROWS_WITH_AS(ss >> j,
"[json.exception.parse_error.101] parse error at line 2, column 1: syntax error while parsing value - unexpected end of input; expected '[', '{', or a literal", json::parse_error&);
}
SECTION("whitespace + one value")
{
std::stringstream ss;
ss << "\n\t 333";
json j;
CHECK_NOTHROW(ss >> j);
CHECK(j == 333);
CHECK_THROWS_WITH_AS(ss >> j, "[json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON", json::parse_error&);
}
SECTION("three values")
{
std::stringstream ss;
ss << " 111 \n222\n \n 333";
json j;
CHECK_NOTHROW(ss >> j);
CHECK(j == 111);
CHECK_NOTHROW(ss >> j);
CHECK(j == 222);
CHECK_NOTHROW(ss >> j);
CHECK(j == 333);
CHECK_THROWS_WITH_AS(ss >> j, "[json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON", json::parse_error&);
}
SECTION("literals without whitespace")
{
std::stringstream ss;
ss << "truefalsenull\"\"";
json j;
CHECK_NOTHROW(ss >> j);
CHECK(j == true);
CHECK_NOTHROW(ss >> j);
CHECK(j == false);
CHECK_NOTHROW(ss >> j);
CHECK(j == nullptr);
CHECK_NOTHROW(ss >> j);
CHECK(j == "");
CHECK_THROWS_WITH_AS(ss >> j, "[json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON", json::parse_error&);
}
SECTION("example from #529")
{
std::stringstream ss;
ss << "{\n \"one\" : 1,\n \"two\" : 2\n}\n{\n \"three\" : 3\n}";
json j;
CHECK_NOTHROW(ss >> j);
CHECK(j == json({{"one", 1}, {"two", 2}}));
CHECK_NOTHROW(ss >> j);
CHECK(j == json({{"three", 3}}));
CHECK_THROWS_WITH_AS(ss >> j, "[json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON", json::parse_error&);
}
SECTION("second example from #529")
{
std::string const str = "{\n\"one\" : 1,\n\"two\" : 2\n}\n{\n\"three\" : 3\n}";
{
std::ofstream file("test.json");
file << str;
}
std::ifstream stream("test.json", std::ifstream::in);
json val;
size_t i = 0;
while (stream.peek() != EOF)
{
CAPTURE(i)
CHECK_NOTHROW(stream >> val);
CHECK(i < 2);
if (i == 0)
{
CHECK(val == json({{"one", 1}, {"two", 2}}));
}
if (i == 1)
{
CHECK(val == json({{"three", 3}}));
}
++i;
}
static_cast<void>(std::remove("test.json"));
}
}
SECTION("issue #389 - Integer-overflow (OSS-Fuzz issue 267)")
{
// original test case
json const j1 = json::parse("-9223372036854775808");
CHECK(j1.is_number_integer());
CHECK(j1.get<json::number_integer_t>() == (std::numeric_limits<std::int64_t>::min)());
// edge case (+1; still an integer)
json const j2 = json::parse("-9223372036854775807");
CHECK(j2.is_number_integer());
CHECK(j2.get<json::number_integer_t>() == (std::numeric_limits<std::int64_t>::min)() + 1);
// edge case (-1; overflow -> floats)
json const j3 = json::parse("-9223372036854775809");
CHECK(j3.is_number_float());
}
SECTION("issue #380 - bug in overflow detection when parsing integers")
{
json const j = json::parse("166020696663385964490");
CHECK(j.is_number_float());
CHECK(j.get<json::number_float_t>() == 166020696663385964490.0);
}
SECTION("issue #405 - Heap-buffer-overflow (OSS-Fuzz issue 342)")
{
// original test case
std::vector<uint8_t> const vec {0x65, 0xf5, 0x0a, 0x48, 0x21};
json _;
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec), "[json.exception.parse_error.110] parse error at byte 6: syntax error while parsing CBOR string: unexpected end of input", json::parse_error&);
}
SECTION("issue #407 - Heap-buffer-overflow (OSS-Fuzz issue 343)")
{
json _;
// original test case: incomplete float64
std::vector<uint8_t> const vec1 {0xcb, 0x8f, 0x0a};
CHECK_THROWS_WITH_AS(_ = json::from_msgpack(vec1), "[json.exception.parse_error.110] parse error at byte 4: syntax error while parsing MessagePack number: unexpected end of input", json::parse_error&);
// related test case: incomplete float32
std::vector<uint8_t> const vec2 {0xca, 0x8f, 0x0a};
CHECK_THROWS_WITH_AS(_ = json::from_msgpack(vec2), "[json.exception.parse_error.110] parse error at byte 4: syntax error while parsing MessagePack number: unexpected end of input", json::parse_error&);
// related test case: incomplete Half-Precision Float (CBOR)
std::vector<uint8_t> const vec3 {0xf9, 0x8f};
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec3), "[json.exception.parse_error.110] parse error at byte 3: syntax error while parsing CBOR number: unexpected end of input", json::parse_error&);
// related test case: incomplete Single-Precision Float (CBOR)
std::vector<uint8_t> const vec4 {0xfa, 0x8f, 0x0a};
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec4), "[json.exception.parse_error.110] parse error at byte 4: syntax error while parsing CBOR number: unexpected end of input", json::parse_error&);
// related test case: incomplete Double-Precision Float (CBOR)
std::vector<uint8_t> const vec5 {0xfb, 0x8f, 0x0a};
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec5), "[json.exception.parse_error.110] parse error at byte 4: syntax error while parsing CBOR number: unexpected end of input", json::parse_error&);
}
SECTION("issue #408 - Heap-buffer-overflow (OSS-Fuzz issue 344)")
{
json _;
// original test case
std::vector<uint8_t> const vec1 {0x87};
CHECK_THROWS_WITH_AS(_ = json::from_msgpack(vec1), "[json.exception.parse_error.110] parse error at byte 2: syntax error while parsing MessagePack string: unexpected end of input", json::parse_error&);
// more test cases for MessagePack
for (auto b :
{
0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, // fixmap
0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, // fixarray
0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, // fixstr
0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf
})
{
std::vector<uint8_t> const vec(1, static_cast<uint8_t>(b));
CHECK_THROWS_AS(_ = json::from_msgpack(vec), json::parse_error&);
}
// more test cases for CBOR
for (auto b :
{
0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, // UTF-8 string
0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, // array
0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7 // map
})
{
std::vector<uint8_t> const vec(1, static_cast<uint8_t>(b));
CHECK_THROWS_AS(_ = json::from_cbor(vec), json::parse_error&);
}
// special case: empty input
std::vector<uint8_t> const vec2;
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec2), "[json.exception.parse_error.110] parse error at byte 1: syntax error while parsing CBOR value: unexpected end of input", json::parse_error&);
CHECK_THROWS_WITH_AS(_ = json::from_msgpack(vec2), "[json.exception.parse_error.110] parse error at byte 1: syntax error while parsing MessagePack value: unexpected end of input", json::parse_error&);
}
SECTION("issue #411 - Heap-buffer-overflow (OSS-Fuzz issue 366)")
{
json _;
// original test case: empty UTF-8 string (indefinite length)
std::vector<uint8_t> const vec1 {0x7f};
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec1), "[json.exception.parse_error.110] parse error at byte 2: syntax error while parsing CBOR string: unexpected end of input", json::parse_error&);
// related test case: empty array (indefinite length)
std::vector<uint8_t> const vec2 {0x9f};
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec2), "[json.exception.parse_error.110] parse error at byte 2: syntax error while parsing CBOR value: unexpected end of input", json::parse_error&);
// related test case: empty map (indefinite length)
std::vector<uint8_t> const vec3 {0xbf};
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec3), "[json.exception.parse_error.110] parse error at byte 2: syntax error while parsing CBOR string: unexpected end of input", json::parse_error&);
}
SECTION("issue #412 - Heap-buffer-overflow (OSS-Fuzz issue 367)")
{
// original test case
std::vector<uint8_t> const vec
{
0xab, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98,
0x98, 0x98, 0x98, 0x98, 0x98, 0x00, 0x00, 0x00,
0x60, 0xab, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98,
0x98, 0x98, 0x98, 0x98, 0x98, 0x00, 0x00, 0x00,
0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60,
0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60,
0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60,
0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60,
0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60,
0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60,
0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0xa0, 0x9f,
0x9f, 0x97, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60,
0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60,
0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60,
0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60,
0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60,
0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60
};
json _;
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec), "[json.exception.parse_error.113] parse error at byte 2: syntax error while parsing CBOR object key: only string keys are supported, but found an array; last byte: 0x98", json::parse_error&);
// related test case: nonempty UTF-8 string (indefinite length)
std::vector<uint8_t> const vec1 {0x7f, 0x61, 0x61};
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec1), "[json.exception.parse_error.110] parse error at byte 4: syntax error while parsing CBOR string: unexpected end of input", json::parse_error&);
// related test case: nonempty array (indefinite length)
std::vector<uint8_t> const vec2 {0x9f, 0x01};
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec2), "[json.exception.parse_error.110] parse error at byte 3: syntax error while parsing CBOR value: unexpected end of input", json::parse_error&);
// related test case: nonempty map (indefinite length)
std::vector<uint8_t> const vec3 {0xbf, 0x61, 0x61, 0x01};
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec3), "[json.exception.parse_error.110] parse error at byte 5: syntax error while parsing CBOR string: unexpected end of input", json::parse_error&);
}
SECTION("issue #414 - compare with literal 0)")
{
#define CHECK_TYPE(v) \
CHECK((json(v) == (v)));\
CHECK(((v) == json(v)));\
CHECK_FALSE((json(v) != (v)));\
CHECK_FALSE(((v) != json(v)));
CHECK_TYPE(nullptr)
CHECK_TYPE(0)
CHECK_TYPE(0u)
CHECK_TYPE(0L)
CHECK_TYPE(0.0)
CHECK_TYPE("") // NOLINT(readability-container-size-empty)
#undef CHECK_TYPE
}
SECTION("issue #416 - Use-of-uninitialized-value (OSS-Fuzz issue 377)")
{
// original test case
std::vector<uint8_t> const vec1
{
0x94, 0xfa, 0xfa, 0xfa, 0xfa, 0xfa, 0xfa, 0xfa,
0x3a, 0x96, 0x96, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4,
0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0x71,
0xb4, 0xb4, 0xfa, 0xfa, 0xfa, 0xfa, 0xfa, 0x3a,
0x96, 0x96, 0xb4, 0xb4, 0xfa, 0x94, 0x94, 0x61,
0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0xfa
};
json _;
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec1), "[json.exception.parse_error.113] parse error at byte 13: syntax error while parsing CBOR object key: only string keys are supported, but found a map; last byte: 0xB4", json::parse_error&);
// related test case: double-precision
std::vector<uint8_t> const vec2
{
0x94, 0xfa, 0xfa, 0xfa, 0xfa, 0xfa, 0xfa, 0xfa,
0x3a, 0x96, 0x96, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4,
0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0xb4, 0x71,
0xb4, 0xb4, 0xfa, 0xfa, 0xfa, 0xfa, 0xfa, 0x3a,
0x96, 0x96, 0xb4, 0xb4, 0xfa, 0x94, 0x94, 0x61,
0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0xfb
};
CHECK_THROWS_WITH_AS(_ = json::from_cbor(vec2), "[json.exception.parse_error.113] parse error at byte 13: syntax error while parsing CBOR object key: only string keys are supported, but found a map; last byte: 0xB4", json::parse_error&);
}
SECTION("issue #452 - Heap-buffer-overflow (OSS-Fuzz issue 585)")
{
std::vector<uint8_t> const vec = {'-', '0', '1', '2', '2', '7', '4'};
json _;
CHECK_THROWS_AS(_ = json::parse(vec), json::parse_error&);
}
SECTION("issue #454 - doubles are printed as integers")
{
json j = R"({"bool_value":true,"double_value":2.0,"int_value":10,"level1":{"list_value":[3,"hi",false],"tmp":5.0},"string_value":"hello"})"_json;
CHECK(j["double_value"].is_number_float());
}
#if JSON_USE_IMPLICIT_CONVERSIONS
SECTION("issue #464 - VS2017 implicit to std::string conversion fix")
{
const json v = "test";
std::string test;
test = v;
CHECK(v == "test");
}
#endif
SECTION("issue #465 - roundtrip error while parsing 1000000000000000010E5")
{
json const j1 = json::parse("1000000000000000010E5");
const std::string s1 = j1.dump();
json const j2 = json::parse(s1);
const std::string s2 = j2.dump();
CHECK(s1 == s2);
}
#if JSON_USE_IMPLICIT_CONVERSIONS
SECTION("issue #473 - inconsistent behavior in conversion to array type")
{
json const j_array = {1, 2, 3, 4};
json const j_number = 42;
json const j_null = nullptr;
SECTION("std::vector")
{
auto create = [](const json & j)
{
std::vector<int> const v = j;
};
CHECK_NOTHROW(create(j_array));
CHECK_THROWS_WITH_AS(create(j_number), "[json.exception.type_error.302] type must be array, but is number", json::type_error&);
CHECK_THROWS_WITH_AS(create(j_null), "[json.exception.type_error.302] type must be array, but is null", json::type_error&);
}
SECTION("std::list")
{
auto create = [](const json & j)
{
std::list<int> const v = j;
};
CHECK_NOTHROW(create(j_array));
CHECK_THROWS_WITH_AS(create(j_number), "[json.exception.type_error.302] type must be array, but is number", json::type_error&);
CHECK_THROWS_WITH_AS(create(j_null), "[json.exception.type_error.302] type must be array, but is null", json::type_error&);
}
SECTION("std::forward_list")
{
auto create = [](const json & j)
{
std::forward_list<int> const v = j;
};
CHECK_NOTHROW(create(j_array));
CHECK_THROWS_WITH_AS(create(j_number), "[json.exception.type_error.302] type must be array, but is number", json::type_error&);
CHECK_THROWS_WITH_AS(create(j_null), "[json.exception.type_error.302] type must be array, but is null", json::type_error&);
}
}
#endif
SECTION("issue #486 - json::value_t can't be a map's key type in VC++ 2015")
{
// the code below must compile with MSVC
std::map<json::value_t, std::string> jsonTypes ;
jsonTypes[json::value_t::array] = "array";
}
SECTION("issue #494 - conversion from vector<bool> to json fails to build")
{
std::vector<bool> const boolVector = {false, true, false, false};
json j;
j["bool_vector"] = boolVector;
CHECK(j["bool_vector"].dump() == "[false,true,false,false]");
}
SECTION("issue #504 - assertion error (OSS-Fuzz 856)")
{
std::vector<uint8_t> const vec1 = {0xf9, 0xff, 0xff, 0x4a, 0x3a, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x01, 0x37, 0x02, 0x38};
json const j1 = json::from_cbor(vec1, false);
// step 2: round trip
std::vector<uint8_t> vec2 = json::to_cbor(j1);
// parse serialization
json const j2 = json::from_cbor(vec2);
// NaN is dumped to "null"
CHECK(j2.is_number_float());
CHECK(std::isnan(j2.get<json::number_float_t>()));
CHECK(j2.dump() == "null");
// check if serializations match
CHECK(json::to_cbor(j2) == vec2);
}
SECTION("issue #512 - use of overloaded operator '<=' is ambiguous")
{
json j;
j["a"] = 5;
// json op scalar
CHECK(j["a"] == 5);
CHECK(j["a"] != 4);
CHECK(j["a"] <= 7);
CHECK(j["a"] < 7);
CHECK(j["a"] >= 3);
CHECK(j["a"] > 3);
CHECK(!(j["a"] <= 4));
CHECK(!(j["a"] < 4));
CHECK(!(j["a"] >= 6));
CHECK(!(j["a"] > 6));
// scalar op json
CHECK(5 == j["a"]);
CHECK(4 != j["a"]);
CHECK(7 >= j["a"]);
CHECK(7 > j["a"]);
CHECK(3 <= j["a"]);
CHECK(3 < j["a"]);
CHECK(!(4 >= j["a"]));
CHECK(!(4 > j["a"]));
CHECK(!(6 <= j["a"]));
CHECK(!(6 < j["a"]));
}
SECTION("issue #575 - heap-buffer-overflow (OSS-Fuzz 1400)")
{
json _;
std::vector<uint8_t> const vec = {'"', '\\', '"', 'X', '"', '"'};
CHECK_THROWS_AS(_ = json::parse(vec), json::parse_error&);
}
#if JSON_USE_IMPLICIT_CONVERSIONS
SECTION("issue #600 - how does one convert a map in Json back to std::map?")
{
SECTION("example 1")
{
// create a map
const std::map<std::string, int> m1 {{"key", 1}};
// create and print a JSON from the map
json const j = m1;
// get the map out of JSON
std::map<std::string, int> m2 = j;
// make sure the roundtrip succeeds
CHECK(m1 == m2);
}
SECTION("example 2")
{
// create a map
const std::map<std::string, std::string> m1 {{"key", "val"}};
// create and print a JSON from the map
json const j = m1;
// get the map out of JSON
std::map<std::string, std::string> m2 = j;
// make sure the roundtrip succeeds
CHECK(m1 == m2);
}
}
#endif
SECTION("issue #602 - BOM not skipped when using json:parse(iterator)")
{
std::string i = "\xef\xbb\xbf{\n \"foo\": true\n}";
json _;
CHECK_NOTHROW(_ = json::parse(i.begin(), i.end()));
}
#if JSON_USE_IMPLICIT_CONVERSIONS
SECTION("issue #702 - conversion from valarray<double> to json fails to build")
{
SECTION("original example")
{
std::valarray<double> const v;
nlohmann::json j;
j["test"] = v;
}
SECTION("full example")
{
std::valarray<double> v = {1.2, 2.3, 3.4, 4.5};
json j = v;
std::valarray<double> vj = j;
CHECK(j == json(vj));
CHECK(v.size() == vj.size());
for (size_t i = 0; i < v.size(); ++i)
{
CHECK(v[i] == vj[i]);
CHECK(v[i] == j[i]);
}
CHECK_THROWS_WITH_AS(json().get<std::valarray<double>>(), "[json.exception.type_error.302] type must be array, but is null", json::type_error&);
}
}
#endif
SECTION("issue #367 - Behavior of operator>> should more closely resemble that of built-in overloads.")
{
SECTION("example 1")
{
std::istringstream i1_2_3( R"({"first": "one" }{"second": "two"}3)" );
json j1;
json j2;
json j3;
i1_2_3 >> j1;
i1_2_3 >> j2;
i1_2_3 >> j3;
auto m1 = j1.get<std::map<std::string, std::string>>();
auto m2 = j2.get<std::map<std::string, std::string>>();
const int i3{j3};
CHECK( m1 == ( std::map<std::string, std::string> {{ "first", "one" }} ));
CHECK( m2 == ( std::map<std::string, std::string> {{ "second", "two" }} ));
CHECK( i3 == 3 );
}
}
SECTION("issue #714 - throw std::ios_base::failure exception when failbit set to true")
{
{
std::ifstream is;
is.exceptions(
is.exceptions()
| std::ios_base::failbit
| std::ios_base::badbit
); // handle different exceptions as 'file not found', 'permission denied'
is.open(TEST_DATA_DIRECTORY "/regression/working_file.json");
json _;
CHECK_NOTHROW(_ = nlohmann::json::parse(is));
}
{
std::ifstream is;
is.exceptions(
is.exceptions()
| std::ios_base::failbit
| std::ios_base::badbit
); // handle different exceptions as 'file not found', 'permission denied'
is.open(TEST_DATA_DIRECTORY "/json_nlohmann_tests/all_unicode.json.cbor",
std::ios_base::in | std::ios_base::binary);
json _;
CHECK_NOTHROW(_ = nlohmann::json::from_cbor(is));
}
}
SECTION("issue #805 - copy constructor is used with std::initializer_list constructor.")
{
nocopy n;
json j;
j = {{"nocopy", n}};
CHECK(j["nocopy"]["val"] == 0);
}
SECTION("issue #838 - incorrect parse error with binary data in keys")
{
std::array<uint8_t, 28> key1 = {{ 103, 92, 117, 48, 48, 48, 55, 92, 114, 215, 126, 214, 95, 92, 34, 174, 40, 71, 38, 174, 40, 71, 38, 223, 134, 247, 127, 0 }};
std::string const key1_str(reinterpret_cast<char*>(key1.data()));
json const j = key1_str;
// dump() is nodiscard; the exception is thrown by dump() itself before it would return
CHECK_THROWS_WITH_AS(utils::ignore_return_value(j.dump()), "[json.exception.type_error.316] invalid UTF-8 byte at index 10: 0x7E", json::type_error&);
}
#if JSON_USE_IMPLICIT_CONVERSIONS
SECTION("issue #843 - converting to array not working")
{
json j;
std::array<int, 4> ar = {{1, 1, 1, 1}};
j = ar;
ar = j;
}
#endif
SECTION("issue #894 - invalid RFC6902 copy operation succeeds")
{
auto model = R"({
"one": {
"two": {
"three": "hello",
"four": 42
}
}
})"_json;
auto p1 = R"([{"op": "move",
"from": "/one/two/three",
"path": "/a/b/c"}])"_json;
#if JSON_DIAGNOSTIC_POSITIONS
CHECK_THROWS_WITH_AS(model.patch(p1),
"[json.exception.out_of_range.403] (bytes 0-158) key 'a' not found", json::out_of_range&);
#else
CHECK_THROWS_WITH_AS(model.patch(p1),
"[json.exception.out_of_range.403] key 'a' not found", json::out_of_range&);
#endif
auto p2 = R"([{"op": "copy",
"from": "/one/two/three",
"path": "/a/b/c"}])"_json;
#if JSON_DIAGNOSTIC_POSITIONS
CHECK_THROWS_WITH_AS(model.patch(p2),
"[json.exception.out_of_range.403] (bytes 0-158) key 'a' not found", json::out_of_range&);
#else
CHECK_THROWS_WITH_AS(model.patch(p2),
"[json.exception.out_of_range.403] key 'a' not found", json::out_of_range&);
#endif
}
SECTION("issue #961 - incorrect parsing of indefinite length CBOR strings")
{
std::vector<uint8_t> const v_cbor =
{
0x7F,
0x64,
'a', 'b', 'c', 'd',
0x63,
'1', '2', '3',
0xFF
};
const json j = json::from_cbor(v_cbor);
CHECK(j == "abcd123");
}
SECTION("issue #962 - Timeout (OSS-Fuzz 6034)")
{
json _;
std::vector<uint8_t> v_ubjson = {'[', '$', 'Z', '#', 'L', 0x78, 0x28, 0x00, 0x68, 0x28, 0x69, 0x69, 0x17};
CHECK_THROWS_AS(_ = json::from_ubjson(v_ubjson), json::out_of_range&);
//CHECK_THROWS_WITH(json::from_ubjson(v_ubjson),
// "[json.exception.out_of_range.408] excessive array size: 8658170730974374167");
v_ubjson[0] = '{';
CHECK_THROWS_AS(_ = json::from_ubjson(v_ubjson), json::out_of_range&);
//CHECK_THROWS_WITH(json::from_ubjson(v_ubjson),
// "[json.exception.out_of_range.408] excessive object size: 8658170730974374167");
}
SECTION("issue #971 - Add a SAX parser - late bug")
{
// a JSON text
const auto* text = R"(
{
"Image": {
"Width": 800,
"Height": 600,
"Title": "View from 15th Floor",
"Thumbnail": {
"Url": "http://www.example.com/image/481989943",
"Height": 125,
"Width": 100
},
"Animated" : false,
"IDs": [116, 943, 234, 38793]
}
}
)";
// define parser callback
json::parser_callback_t const cb = [](int /*depth*/, json::parse_event_t event, json & parsed)
{
// skip object elements with key "Thumbnail"
return !(event == json::parse_event_t::key && parsed == json("Thumbnail"));
};
// parse (with callback) and serialize JSON
const json j_filtered = json::parse(text, cb);
CHECK(j_filtered == R"({"Image":{"Animated":false,"Height":600,"IDs":[116,943,234,38793], "Title":"View from 15th Floor","Width":800}})"_json);
}
SECTION("issue #972 - Segmentation fault on G++ when trying to assign json string literal to custom json type")
{
// this assignment used to crash outright
my_json const foo = R"([1, 2, 3])"_json;
// fifo_map is the adapter the docs recommend for keeping object keys
// in insertion order (see docs/mkdocs/docs/features/object_order.md
// and docs/mkdocs/docs/features/types/template_parameters.md); check
// that recommendation actually holds, including through erase() and
// inserting a new key. The comparator is stateful, so this avoids
// deep copies of "order" (see #1763, #5649).
my_json order = my_json::parse(R"({"z":1,"a":2,"m":{"y":1,"b":2}})");
CHECK(order.dump() == R"({"z":1,"a":2,"m":{"y":1,"b":2}})");
order.erase("z");
CHECK(order.dump() == R"({"a":2,"m":{"y":1,"b":2}})");
order["new_key"] = 3;
CHECK(order.dump() == R"({"a":2,"m":{"y":1,"b":2},"new_key":3})");
}
SECTION("operator[](json_pointer) when emplace() finds a key the lookup does not")
{
// a copied fifo_map restarts its timestamps, so a new key "k" gets
// the timestamp of "x": the lookup does not find "k", but emplace()
// finds "x" and inserts nothing; the pointer then continues with the
// member of "x", as basic_json::operator[] does
const my_json orig = my_json::parse(R"({"x":1})");
const std::array<const char*, 3> pointers = {{"/k/0", "/k/a/b", "/k/-"}};
for (const char* pointer : pointers)
{
CAPTURE(pointer)
my_json j = orig;
CHECK_THROWS_AS(j[my_json::json_pointer(pointer)], my_json::out_of_range&);
CHECK(j.dump() == R"({"x":1})");
}
}
SECTION("issue #977 - Assigning between different json types")
{
foo_json lj = ns::foo{3};
const ns::foo ff(lj);
CHECK(lj.is_object());
CHECK(lj.size() == 1);
CHECK(lj["x"] == 3);
CHECK(ff.x == 3);
nlohmann::json const nj = lj; // This line works as expected
}
}
#if !defined(JSON_NOEXCEPTION)
TEST_CASE("regression tests, exceptions dependent")
{
SECTION("issue #1340 - eof not set on exhausted input stream")
{
std::stringstream s("{}{}");
json j;
s >> j;
s >> j;
CHECK_THROWS_AS(s >> j, json::parse_error const&);
CHECK(s.eof());
}
}
#endif
/////////////////////////////////////////////////////////////////////
// for #1642
/////////////////////////////////////////////////////////////////////
// the code below fails with Clang on Windows, so we need to exclude it there
#if DOCTEST_CLANG && (defined(WIN32) || defined(_WIN32) || defined(__WIN32) && !defined(__CYGWIN__))
#else
template <typename T> class array {};
template <typename T> class object {};
template <typename T> class string {};
template <typename T> class number_integer {};
template <typename T> class number_unsigned {};
template <typename T> class number_float {};
#endif
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