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Handle NaN and Infinity in JSON stringify function

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This commit is contained in:
Aaron Franke 2025-07-21 07:49:18 -07:00
parent 73da0d2020
commit e90cea9250
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2 changed files with 33 additions and 0 deletions
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11
core/io/json.cpp
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@ -75,6 +75,17 @@ void JSON::_stringify(String &r_result, const Variant &p_var, const String &p_in
case Variant::FLOAT: {
const double num = p_var;
// JSON does not support NaN or Infinity, so use extremely large numbers for infinity.
if (!Math::is_finite(num)) {
if (num == Math::INF) {
r_result += "1e99999";
} else if (num == -Math::INF) {
r_result += "-1e99999";
} else {
r_result += "\"NaN\"";
}
return;
}
// Only for exactly 0. If we have approximately 0 let the user decide how much
// precision they want.
if (num == double(0.0)) {

22
tests/core/io/test_json.h
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@ -75,7 +75,18 @@ TEST_CASE("[JSON] Stringify arrays") {
full_precision_array.push_back(0.123456789012345677);
CHECK(JSON::stringify(full_precision_array, "", true, true) == "[0.123456789012345677]");
Array non_finite_array;
non_finite_array.push_back(Math::INF);
non_finite_array.push_back(-Math::INF);
non_finite_array.push_back(Math::NaN);
CHECK(JSON::stringify(non_finite_array) == "[1e99999,-1e99999,\"NaN\"]");
ERR_PRINT_OFF
Array non_finite_round_trip = JSON::parse_string(JSON::stringify(non_finite_array));
CHECK(non_finite_round_trip[0] == Variant(Math::INF));
CHECK(non_finite_round_trip[1] == Variant(-Math::INF));
CHECK(non_finite_round_trip[2].get_type() == Variant::STRING);
Array self_array;
self_array.push_back(self_array);
CHECK(JSON::stringify(self_array) == "[\"[...]\"]");
@ -113,7 +124,18 @@ TEST_CASE("[JSON] Stringify dictionaries") {
full_precision_dictionary["key"] = 0.123456789012345677;
CHECK(JSON::stringify(full_precision_dictionary, "", true, true) == "{\"key\":0.123456789012345677}");
Dictionary non_finite_dictionary;
non_finite_dictionary["-inf"] = -Math::INF;
non_finite_dictionary["inf"] = Math::INF;
non_finite_dictionary["nan"] = Math::NaN;
CHECK(JSON::stringify(non_finite_dictionary) == "{\"-inf\":-1e99999,\"inf\":1e99999,\"nan\":\"NaN\"}");
ERR_PRINT_OFF
Dictionary non_finite_round_trip = JSON::parse_string(JSON::stringify(non_finite_dictionary));
CHECK(non_finite_round_trip["-inf"] == Variant(-Math::INF));
CHECK(non_finite_round_trip["inf"] == Variant(Math::INF));
CHECK(non_finite_round_trip["nan"].get_type() == Variant::STRING);
Dictionary self_dictionary;
self_dictionary["key"] = self_dictionary;
CHECK(JSON::stringify(self_dictionary) == "{\"key\":\"{...}\"}");