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libraries/ArduinoJson/extras/tests/JsonArray/subscript.cpp

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+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2025, Benoit BLANCHON
+// MIT License
+
+#include <ArduinoJson.h>
+#include <stdint.h>
+#include <catch.hpp>
+
+#include "Allocators.hpp"
+#include "Literals.hpp"
+
+TEST_CASE("JsonArray::operator[]") {
+  SpyingAllocator spy;
+  JsonDocument doc(&spy);
+  JsonArray array = doc.to<JsonArray>();
+
+  SECTION("Pad with null") {
+    array[2] = 2;
+    array[5] = 5;
+    REQUIRE(array.size() == 6);
+    REQUIRE(array[0].isNull() == true);
+    REQUIRE(array[1].isNull() == true);
+    REQUIRE(array[2].isNull() == false);
+    REQUIRE(array[3].isNull() == true);
+    REQUIRE(array[4].isNull() == true);
+    REQUIRE(array[5].isNull() == false);
+    REQUIRE(array[2] == 2);
+    REQUIRE(array[5] == 5);
+  }
+
+  SECTION("int") {
+    array[0] = 123;
+    REQUIRE(123 == array[0].as<int>());
+    REQUIRE(true == array[0].is<int>());
+    REQUIRE(false == array[0].is<bool>());
+  }
+
+#if ARDUINOJSON_USE_LONG_LONG
+  SECTION("long long") {
+    array[0] = 9223372036854775807;
+    REQUIRE(9223372036854775807 == array[0].as<int64_t>());
+    REQUIRE(true == array[0].is<int64_t>());
+    REQUIRE(false == array[0].is<int32_t>());
+    REQUIRE(false == array[0].is<bool>());
+  }
+#endif
+
+  SECTION("double") {
+    array[0] = 123.45;
+    REQUIRE(123.45 == array[0].as<double>());
+    REQUIRE(true == array[0].is<double>());
+    REQUIRE(false == array[0].is<int>());
+  }
+
+  SECTION("bool") {
+    array[0] = true;
+    REQUIRE(true == array[0].as<bool>());
+    REQUIRE(true == array[0].is<bool>());
+    REQUIRE(false == array[0].is<int>());
+  }
+
+  SECTION("string literal") {
+    array[0] = "hello";
+
+    REQUIRE(array[0].as<std::string>() == "hello");
+    REQUIRE(true == array[0].is<const char*>());
+    REQUIRE(false == array[0].is<int>());
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("world")),
+                         });
+  }
+
+  SECTION("const char*") {
+    const char* str = "hello";
+    array[0] = str;
+
+    REQUIRE(array[0].as<std::string>() == "hello");
+    REQUIRE(true == array[0].is<const char*>());
+    REQUIRE(false == array[0].is<int>());
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("world")),
+                         });
+  }
+
+  SECTION("std::string") {
+    array[0] = "hello"_s;
+
+    REQUIRE(array[0].as<std::string>() == "hello");
+    REQUIRE(true == array[0].is<const char*>());
+    REQUIRE(false == array[0].is<int>());
+    REQUIRE(spy.log() == AllocatorLog{
+                             Allocate(sizeofPool()),
+                             Allocate(sizeofString("world")),
+                         });
+  }
+
+#ifdef HAS_VARIABLE_LENGTH_ARRAY
+  SECTION("VLA") {
+    size_t i = 16;
+    char vla[i];
+    strcpy(vla, "world");
+
+    array.add("hello");
+    array[0] = vla;
+
+    REQUIRE(array[0] == "world"_s);
+  }
+#endif
+
+  SECTION("nested array") {
+    JsonDocument doc2;
+    JsonArray arr2 = doc2.to<JsonArray>();
+
+    array[0] = arr2;
+
+    REQUIRE(arr2 == array[0].as<JsonArray>());
+    REQUIRE(true == array[0].is<JsonArray>());
+    REQUIRE(false == array[0].is<int>());
+  }
+
+  SECTION("nested object") {
+    JsonDocument doc2;
+    JsonObject obj = doc2.to<JsonObject>();
+
+    array[0] = obj;
+
+    REQUIRE(obj == array[0].as<JsonObject>());
+    REQUIRE(true == array[0].is<JsonObject>());
+    REQUIRE(false == array[0].is<int>());
+  }
+
+  SECTION("array subscript") {
+    JsonDocument doc2;
+    JsonArray arr2 = doc2.to<JsonArray>();
+    const char* str = "hello";
+
+    arr2.add(str);
+
+    array[0] = arr2[0];
+
+    REQUIRE(str == array[0]);
+  }
+
+  SECTION("object subscript") {
+    const char* str = "hello";
+    JsonDocument doc2;
+    JsonObject obj = doc2.to<JsonObject>();
+
+    obj["x"] = str;
+
+    array[0] = obj["x"];
+
+    REQUIRE(str == array[0]);
+  }
+
+  SECTION("array[0].to<JsonObject>()") {
+    JsonObject obj = array[0].to<JsonObject>();
+    REQUIRE(obj.isNull() == false);
+  }
+
+  SECTION("Use a JsonVariant as index") {
+    array[0] = 1;
+    array[1] = 2;
+    array[2] = 3;
+
+    REQUIRE(array[array[1]] == 3);
+    REQUIRE(array[array[3]] == nullptr);
+  }
+}