feat(python): 在 app 进程里起 40250 脚本层（2P step 4，macOS）

移植 UserInterface/RunMainScript 到 platform/ScriptLib/PythonBoot：40250 把 CPythonLauncher 放在 Main() 的栈上，这里进程归 Godot，launcher 必须活过创建它的那次调用，所以拆成 Start / RunMainScript / RunLine / Stop。37 个模块初始化函数里只调已移植的 initpack()，system.py 因此仍停在第一个 import。脚本报错能传回 GDScript，靠的是 platform/EterBase/Debug.cpp 实现 LogBox/LogBoxf： ScriptLib 的 Traceback() 在 PyErr_Fetch 之后只剩这一条路，LastLogBoxMessage() （platform/EterBase/LogBox.h）是 traceback 唯一幸存的地方。 GDScript 侧新增 Metin2PythonHost（python_host_node.{h,cpp}）——唯一同时认识 godot-cpp 和 port 树的单元，PythonBoot 保持 godot-free。检查脚本 python_host_check.gd 分两段：解释器 + 标准库那段不需要 40250 的 pack，哪个平台都能跑；system.py 那段需要 pack，没有就跳过。桌面入口 python_host_test.gd，真机入口 MT_TEST_MODE=python（导出模板不接受 --script）。验证（macOS）：标准库可 import、codec 注册表可用、sys.path 非空，system.py 停在和 ctest port.python_launcher 完全相同的 ImportError: No module named app； ctest 27/27。Android/iOS 进程内未做，正式启动路径仍不起解释器（2V0）。 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-09-23 10:43:10 +09:00
parent e926759ff5
commit 0a1cdf3d3e
16 changed files with 638 additions and 76 deletions
@@ -0,0 +1,94 @@
+#include "python_host_node.h"
+
+#include <godot_cpp/core/class_db.hpp>
+
+#include "python_stdlib.h"
+
+#ifdef MTGODOT_HAVE_PYTHON
+// Standard types only — PythonBoot.h keeps <Python-2.7/*> and the Win32 shims out of this translation
+// unit, which has to stay compilable next to godot-cpp.
+#include "platform/ScriptLib/PythonBoot.h"
+#include <string>
+#endif
+
+using namespace godot;
+
+namespace mtgodot {
+
+#ifdef MTGODOT_HAVE_PYTHON
+
+String Metin2PythonHost::start(const String &stdlib_path) {
+	String path = stdlib_path;
+	if (path.is_empty()) {
+		path = Metin2Python::stdlib_path(false);
+		if (path.is_empty()) {
+			return String("python27.zip unavailable: ") + Metin2Python::last_error();
+		}
+	}
+	std::string error;
+	if (!PythonBoot::Start(path.utf8().get_data(), &error)) {
+		return String::utf8(error.c_str());
+	}
+	return String();
+}
+
+bool Metin2PythonHost::is_running() {
+	return PythonBoot::IsRunning();
+}
+
+String Metin2PythonHost::run_main_script(const String &command_line) {
+	std::string error;
+	if (!PythonBoot::RunMainScript(command_line.utf8().get_data(), &error)) {
+		return String::utf8(error.c_str());
+	}
+	return String();
+}
+
+String Metin2PythonHost::run_line(const String &source) {
+	std::string error;
+	if (!PythonBoot::RunLine(source.utf8().get_data(), &error)) {
+		return String::utf8(error.c_str());
+	}
+	return String();
+}
+
+void Metin2PythonHost::stop() {
+	PythonBoot::Stop();
+}
+
+#else
+
+// Built without -DMTGODOT_EMBED_PYTHON=ON: the class is still registered so GDScript can tell "no
+// interpreter in this build" apart from "the interpreter failed to start".
+String Metin2PythonHost::start(const String &) {
+	return String("this build has no embedded Python (-DMTGODOT_EMBED_PYTHON=ON)");
+}
+
+bool Metin2PythonHost::is_running() {
+	return false;
+}
+
+String Metin2PythonHost::run_main_script(const String &) {
+	return String("this build has no embedded Python (-DMTGODOT_EMBED_PYTHON=ON)");
+}
+
+String Metin2PythonHost::run_line(const String &) {
+	return String("this build has no embedded Python (-DMTGODOT_EMBED_PYTHON=ON)");
+}
+
+void Metin2PythonHost::stop() {
+}
+
+#endif
+
+void Metin2PythonHost::_bind_methods() {
+	ClassDB::bind_static_method("Metin2PythonHost", D_METHOD("start", "stdlib_path"),
+							   &Metin2PythonHost::start, DEFVAL(String()));
+	ClassDB::bind_static_method("Metin2PythonHost", D_METHOD("is_running"), &Metin2PythonHost::is_running);
+	ClassDB::bind_static_method("Metin2PythonHost", D_METHOD("run_main_script", "command_line"),
+							   &Metin2PythonHost::run_main_script, DEFVAL(String()));
+	ClassDB::bind_static_method("Metin2PythonHost", D_METHOD("run_line", "source"), &Metin2PythonHost::run_line);
+	ClassDB::bind_static_method("Metin2PythonHost", D_METHOD("stop"), &Metin2PythonHost::stop);
+}
+
+} // namespace mtgodot