fast_json/Tests/TestJsonBuilder.mq5

//+------------------------------------------------------------------+
//|                                            TestJsonBuilder.mq5 |
//|                                                       AI-Toolkit |
//+------------------------------------------------------------------+
#property script_show_inputs
#include "../fast_json.mqh"

void OnStart() {
  Print("=== JSON V3: THE BUILDER & UNICODE UPDATE ===");

  //---------------------------------------------------------
  // 1. UNICODE TEST
  //---------------------------------------------------------
  Print("--- 1. Unicode Escape Support ---");
  string json_uni =
      "{\"msg\": \"\\u0048\\u0065\\u006C\\u006C\\u006F\"}"; // Hello
  CJson doc_uni;
  if (doc_uni.Parse(json_uni)) {
    string msg = doc_uni["msg"].ToString();
    Print("Encoded: \\u0048\\u0065\\u006C\\u006C\\u006F");
    Print("Decoded: ", msg);

    if (msg == "Hello")
      Print("PASS: Unicode Basic");
    else
      Print("FAIL: Unicode Decoding");
  } else
    Print("FAIL: Unicode Parse Error");

  //---------------------------------------------------------
  // 2. BUILDER TEST
  //---------------------------------------------------------
  Print("\n--- 2. CJsonBuilder Performance ---");
  ulong t0 = GetMicrosecondCount();

  CJsonBuilder b(1024);
  b.Obj()
      .Key("action")
      .Val("trade")
      .Key("params")
      .Obj()
      .Key("symbol")
      .Val("EURUSD")
      .Key("volume")
      .Val(0.1)
      .Key("magic")
      .Val(123456)
      .Key("comment")
      .Val("AI-Generated \u2764") // Heart emoji (native string)
      .EndObj()
      .Key("flags")
      .Arr()
      .Val(1)
      .Val(2)
      .Val(3)
      .EndArr()
      .EndObj();

  string built = b.Build();
  ulong t_build = GetMicrosecondCount() - t0;

  Print("Built JSON: ", built);
  Print("Build Time: ", t_build, " us");

  // Verify Validity
  CJson check;
  if (check.Parse(built)) {
    if (check["params"]["symbol"].ToString() == "EURUSD" &&
        check["flags"][1].ToInt() == 2) {
      Print("PASS: Builder Output is Valid JSON");
    } else
      Print("FAIL: Builder Content Verification");
  } else
    Print("FAIL: Builder produced invalid JSON");

  //---------------------------------------------------------
  // 3. SAFE ACCESSORS
  //---------------------------------------------------------
  Print("\n--- 3. Safe Accessors ---");
  CJsonNode root = check.GetRoot();

  string missing = root["non_existent"].ToString("default_value");
  Print("Missing Key (String): ", missing);
  if (missing == "default_value")
    Print("PASS: Safe String");
  else
    Print("FAIL: Safe String");

  double def_dbl = root["non_existent"].ToDouble(-1.0);
  Print("Missing Key (Double): ", def_dbl);
  if (def_dbl == -1.0)
    Print("PASS: Safe Double");
  else
    Print("FAIL: Safe Double");

  Print("=== TEST COMPLETE ===");
}