ArduinoJson/extras/tests/JsonDeserializer/nestingLimit.cpp

// ArduinoJson - https://arduinojson.org
// Copyright © 2014-2023, Benoit BLANCHON
// MIT License

#include <ArduinoJson.h>
#include <catch.hpp>

#include <sstream>

#define SHOULD_WORK(expression) REQUIRE(DeserializationError::Ok == expression);
#define SHOULD_FAIL(expression) \
  REQUIRE(DeserializationError::TooDeep == expression);

TEST_CASE("JsonDeserializer nesting") {
  DynamicJsonDocument doc(4096);

  SECTION("Input = const char*") {
    SECTION("limit = 0") {
      DeserializationOption::NestingLimit nesting(0);
      SHOULD_WORK(deserializeJson(doc, "\"toto\"", nesting));
      SHOULD_WORK(deserializeJson(doc, "123", nesting));
      SHOULD_WORK(deserializeJson(doc, "true", nesting));
      SHOULD_FAIL(deserializeJson(doc, "[]", nesting));
      SHOULD_FAIL(deserializeJson(doc, "{}", nesting));
      SHOULD_FAIL(deserializeJson(doc, "[\"toto\"]", nesting));
      SHOULD_FAIL(deserializeJson(doc, "{\"toto\":1}", nesting));
    }

    SECTION("limit = 1") {
      DeserializationOption::NestingLimit nesting(1);
      SHOULD_WORK(deserializeJson(doc, "[\"toto\"]", nesting));
      SHOULD_WORK(deserializeJson(doc, "{\"toto\":1}", nesting));
      SHOULD_FAIL(deserializeJson(doc, "{\"toto\":{}}", nesting));
      SHOULD_FAIL(deserializeJson(doc, "{\"toto\":[]}", nesting));
      SHOULD_FAIL(deserializeJson(doc, "[[\"toto\"]]", nesting));
      SHOULD_FAIL(deserializeJson(doc, "[{\"toto\":1}]", nesting));
    }
  }

  SECTION("char* and size_t") {
    SECTION("limit = 0") {
      DeserializationOption::NestingLimit nesting(0);
      SHOULD_WORK(deserializeJson(doc, "\"toto\"", 6, nesting));
      SHOULD_WORK(deserializeJson(doc, "123", 3, nesting));
      SHOULD_WORK(deserializeJson(doc, "true", 4, nesting));
      SHOULD_FAIL(deserializeJson(doc, "[]", 2, nesting));
      SHOULD_FAIL(deserializeJson(doc, "{}", 2, nesting));
      SHOULD_FAIL(deserializeJson(doc, "[\"toto\"]", 8, nesting));
      SHOULD_FAIL(deserializeJson(doc, "{\"toto\":1}", 10, nesting));
    }

    SECTION("limit = 1") {
      DeserializationOption::NestingLimit nesting(1);
      SHOULD_WORK(deserializeJson(doc, "[\"toto\"]", 8, nesting));
      SHOULD_WORK(deserializeJson(doc, "{\"toto\":1}", 10, nesting));
      SHOULD_FAIL(deserializeJson(doc, "{\"toto\":{}}", 11, nesting));
      SHOULD_FAIL(deserializeJson(doc, "{\"toto\":[]}", 11, nesting));
      SHOULD_FAIL(deserializeJson(doc, "[[\"toto\"]]", 10, nesting));
      SHOULD_FAIL(deserializeJson(doc, "[{\"toto\":1}]", 12, nesting));
    }
  }

  SECTION("Input = std::string") {
    SECTION("limit = 0") {
      DeserializationOption::NestingLimit nesting(0);
      SHOULD_WORK(deserializeJson(doc, std::string("\"toto\""), nesting));
      SHOULD_WORK(deserializeJson(doc, std::string("123"), nesting));
      SHOULD_WORK(deserializeJson(doc, std::string("true"), nesting));
      SHOULD_FAIL(deserializeJson(doc, std::string("[]"), nesting));
      SHOULD_FAIL(deserializeJson(doc, std::string("{}"), nesting));
      SHOULD_FAIL(deserializeJson(doc, std::string("[\"toto\"]"), nesting));
      SHOULD_FAIL(deserializeJson(doc, std::string("{\"toto\":1}"), nesting));
    }

    SECTION("limit = 1") {
      DeserializationOption::NestingLimit nesting(1);
      SHOULD_WORK(deserializeJson(doc, std::string("[\"toto\"]"), nesting));
      SHOULD_WORK(deserializeJson(doc, std::string("{\"toto\":1}"), nesting));
      SHOULD_FAIL(deserializeJson(doc, std::string("{\"toto\":{}}"), nesting));
      SHOULD_FAIL(deserializeJson(doc, std::string("{\"toto\":[]}"), nesting));
      SHOULD_FAIL(deserializeJson(doc, std::string("[[\"toto\"]]"), nesting));
      SHOULD_FAIL(deserializeJson(doc, std::string("[{\"toto\":1}]"), nesting));
    }
  }

  SECTION("Input = std::istream") {
    SECTION("limit = 0") {
      DeserializationOption::NestingLimit nesting(0);
      std::istringstream good("true");
      std::istringstream bad("[]");
      SHOULD_WORK(deserializeJson(doc, good, nesting));
      SHOULD_FAIL(deserializeJson(doc, bad, nesting));
    }

    SECTION("limit = 1") {
      DeserializationOption::NestingLimit nesting(1);
      std::istringstream good("[\"toto\"]");
      std::istringstream bad("{\"toto\":{}}");
      SHOULD_WORK(deserializeJson(doc, good, nesting));
      SHOULD_FAIL(deserializeJson(doc, bad, nesting));
    }
  }
}