test_script_admin.cpp

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "../stdafx.h"
 
#include "../3rdparty/catch2/catch.hpp"
 
#include "../game/game_instance.hpp"
#include "../script/api/script_admin.hpp"
#include "../script/api/script_event_types.hpp"
#include "../script/script_instance.hpp"
#include "../script/squirrel.hpp"
 
#include "../3rdparty/fmt/format.h"
#include "../3rdparty/nlohmann/json.hpp"
 
#include <squirrel.h>
 
class TestScriptController {
public:
  GameInstance game{};
  ScriptObject::ActiveInstance active{&game};
 
  Squirrel engine{"test"};
  ScriptAllocatorScope scope{&engine};
};
 
extern bool ScriptAdminMakeJSON(nlohmann::json &json, HSQUIRRELVM vm, SQInteger index, int depth = 0);
 
static std::optional<std::string> TestScriptAdminMakeJSON(std::string_view squirrel)
{
  auto vm = sq_open(1024);
  /* sq_compile creates a closure with our snipper, which is a table.
   * Add "return " to get the table on the stack. */
  std::string buffer = fmt::format("return {}", squirrel);
 
  /* Insert an (empty) class for testing. */
  sq_pushroottable(vm);
  sq_pushstring(vm, "DummyClass", -1);
  sq_newclass(vm, SQFalse);
  sq_newslot(vm, -3, SQFalse);
  sq_pop(vm, 1);
 
  /* Compile the snippet. */
  REQUIRE(sq_compilebuffer(vm, buffer.c_str(), buffer.size(), "test", SQTrue) == SQ_OK);
  /* Execute the snippet, capturing the return value. */
  sq_pushroottable(vm);
  REQUIRE(sq_call(vm, 1, SQTrue, SQTrue) == SQ_OK);
  /* Ensure the snippet pushed a table on the stack. */
  REQUIRE(sq_gettype(vm, -1) == OT_TABLE);
 
  /* Feed the snippet into the MakeJSON function. */
  nlohmann::json json;
  if (!ScriptAdminMakeJSON(json, vm, -1)) {
    sq_close(vm);
    return std::nullopt;
  }
 
  sq_close(vm);
  return json.dump();
}
 
static std::optional<std::string> TestScriptEventAdminPort(const std::string &json)
{
  auto vm = sq_open(1024);
 
  /* Run the conversion JSON -> Squirrel (this will now be on top of the stack). */
  ScriptEventAdminPort(json).GetObject(vm);
  if (sq_gettype(vm, -1) == OT_NULL) {
    sq_close(vm);
    return std::nullopt;
  }
  REQUIRE(sq_gettype(vm, -1) == OT_TABLE);
 
  nlohmann::json squirrel_json;
  REQUIRE(ScriptAdminMakeJSON(squirrel_json, vm, -1) == true);
 
  sq_close(vm);
  return squirrel_json.dump();
}
 
TEST_CASE("Squirrel -> JSON conversion")
{
  TestScriptController controller;
 
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = null })sq") == R"json({"test":null})json");
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = 1 })sq") == R"json({"test":1})json");
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = -1 })sq") == R"json({"test":-1})json");
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = true })sq") == R"json({"test":true})json");
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = "a" })sq") == R"json({"test":"a"})json");
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = [ ] })sq") == R"json({"test":[]})json");
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = [ 1 ] })sq") == R"json({"test":[1]})json");
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = [ 1, "a", true, { test = 1 }, [], null ] })sq") == R"json({"test":[1,"a",true,{"test":1},[],null]})json");
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = { } })sq") == R"json({"test":{}})json");
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = { test = 1 } })sq") == R"json({"test":{"test":1}})json");
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = { test = 1, test = 2 } })sq") == R"json({"test":{"test":2}})json");
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = { test = 1, test2 = [ 2 ] } })sq") == R"json({"test":{"test":1,"test2":[2]}})json");
 
  /* Cases that should fail, as we cannot convert a class to JSON. */
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = DummyClass })sq") == std::nullopt);
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = [ 1, DummyClass ] })sq") == std::nullopt);
  CHECK(TestScriptAdminMakeJSON(R"sq({ test = { test = 1, test2 = DummyClass } })sq") == std::nullopt);
}
 
TEST_CASE("JSON -> Squirrel conversion")
{
  TestScriptController controller;
 
  CHECK(TestScriptEventAdminPort(R"json({ "test": null })json") == R"json({"test":null})json");
  CHECK(TestScriptEventAdminPort(R"json({ "test": 1 })json") == R"json({"test":1})json");
  CHECK(TestScriptEventAdminPort(R"json({ "test": -1 })json") == R"json({"test":-1})json");
  CHECK(TestScriptEventAdminPort(R"json({ "test": true })json") == R"json({"test":true})json");
  CHECK(TestScriptEventAdminPort(R"json({ "test": "a" })json") == R"json({"test":"a"})json");
  CHECK(TestScriptEventAdminPort(R"json({ "test": [] })json") == R"json({"test":[]})json");
  CHECK(TestScriptEventAdminPort(R"json({ "test": [ 1 ] })json") == R"json({"test":[1]})json");
  CHECK(TestScriptEventAdminPort(R"json({ "test": [ 1, "a", true, { "test": 1 }, [], null ] })json") == R"json({"test":[1,"a",true,{"test":1},[],null]})json");
  CHECK(TestScriptEventAdminPort(R"json({ "test": {} })json") == R"json({"test":{}})json");
  CHECK(TestScriptEventAdminPort(R"json({ "test": { "test": 1 } })json") == R"json({"test":{"test":1}})json");
  CHECK(TestScriptEventAdminPort(R"json({ "test": { "test": 2 } })json") == R"json({"test":{"test":2}})json");
  CHECK(TestScriptEventAdminPort(R"json({ "test": { "test": 1, "test2": [ 2 ] } })json") == R"json({"test":{"test":1,"test2":[2]}})json");
 
  /* Check if spaces are properly ignored. */
  CHECK(TestScriptEventAdminPort(R"json({"test":1})json") == R"json({"test":1})json");
  CHECK(TestScriptEventAdminPort(R"json({"test":        1})json") == R"json({"test":1})json");
 
  /* Valid JSON but invalid Squirrel (read: floats). */
  CHECK(TestScriptEventAdminPort(R"json({ "test": 1.1 })json") == std::nullopt);
  CHECK(TestScriptEventAdminPort(R"json({ "test": [ 1, 3, 1.1 ] })json") == std::nullopt);
 
  /* Root element has to be an object. */
  CHECK(TestScriptEventAdminPort(R"json( 1 )json") == std::nullopt);
  CHECK(TestScriptEventAdminPort(R"json( "a" )json") == std::nullopt);
  CHECK(TestScriptEventAdminPort(R"json( [ 1 ] )json") == std::nullopt);
  CHECK(TestScriptEventAdminPort(R"json( null )json") == std::nullopt);
  CHECK(TestScriptEventAdminPort(R"json( true )json") == std::nullopt);
 
  /* Cases that should fail, as it is invalid JSON. */
  CHECK(TestScriptEventAdminPort(R"json({"test":test})json") == std::nullopt);
  CHECK(TestScriptEventAdminPort(R"json({ "test": 1 )json") == std::nullopt); // Missing closing }
  CHECK(TestScriptEventAdminPort(R"json(  "test": 1})json") == std::nullopt); // Missing opening {
  CHECK(TestScriptEventAdminPort(R"json({ "test" = 1})json") == std::nullopt);
  CHECK(TestScriptEventAdminPort(R"json({ "test": [ 1 })json") == std::nullopt); // Missing closing ]
  CHECK(TestScriptEventAdminPort(R"json({ "test": 1 ] })json") == std::nullopt); // Missing opening [
}