Features(Lualib/Lua(Jit)): Lua Version and Static Linking Support (#209)

CMakeLists.txt

@@ -0,0 +1,25 @@
+set(LUA_VERSION "lua52" CACHE STRING "Lua version to use")
+set_property(CACHE LUA_VERSION PROPERTY STRINGS luajit lua51 lua52 lua53 lua54)
+MESSAGE(STATUS "Lua version: ${LUA_VERSION}")
+
+# Avoid warning about DOWNLOAD_EXTRACT_TIMESTAMP in CMake 3.24:
+if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.24.0")
+  cmake_policy(SET CMP0135 NEW)
+endif()
+
+option(LUA_STATIC "link lua statically" OFF)
+if (LUA_STATIC)
+  MESSAGE(STATUS "Lua linking: static")
+else()
+  MESSAGE(STATUS "Lua linking: dynamic")
+endif()
+
+if (LUA_VERSION MATCHES "luajit")
+  add_subdirectory(src/lualib/luajit)
+  set(LUAJIT_VERSION true)
+else()
+  add_subdirectory(src/lualib/lua)
+  set(LUAJIT_VERSION false)
+endif()
+
+set_target_properties(lualib PROPERTIES INTERFACE_COMPILE_DEFINITIONS LUAJIT_VERSION)

src/LuaEngine/ElunaCompat.cpp

@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2010 - 2024 Eluna Lua Engine <https://elunaluaengine.github.io/>
+ * This program is free software licensed under GPL version 3
+ * Please see the included DOCS/LICENSE.md for more information
+ */
+
+#include "ElunaCompat.h"
+
+#if LUA_VERSION_NUM == 501
+const char* luaL_tolstring(lua_State* L, int idx, size_t* len) {
+    if (!luaL_callmeta(L, idx, "__tostring")) {
+        int t = lua_type(L, idx), tt = 0;
+        char const* name = NULL;
+        switch (t) {
+        case LUA_TNIL:
+            lua_pushliteral(L, "nil");
+            break;
+        case LUA_TSTRING:
+        case LUA_TNUMBER:
+            lua_pushvalue(L, idx);
+            break;
+        case LUA_TBOOLEAN:
+            if (lua_toboolean(L, idx))
+                lua_pushliteral(L, "true");
+            else
+                lua_pushliteral(L, "false");
+            break;
+        default:
+            tt = luaL_getmetafield(L, idx, "__name");
+            name = (tt == LUA_TSTRING) ? lua_tostring(L, -1) : lua_typename(L, t);
+            lua_pushfstring(L, "%s: %p", name, lua_topointer(L, idx));
+            if (tt != LUA_TNIL)
+                lua_replace(L, -2);
+            break;
+        }
+    }
+    else {
+        if (!lua_isstring(L, -1))
+            luaL_error(L, "'__tostring' must return a string");
+    }
+    return lua_tolstring(L, -1, len);
+}
+
+int luaL_getsubtable(lua_State* L, int i, const char* name) {
+    int abs_i = lua_absindex(L, i);
+    luaL_checkstack(L, 3, "not enough stack slots");
+    lua_pushstring(L, name);
+    lua_gettable(L, abs_i);
+    if (lua_istable(L, -1))
+        return 1;
+    lua_pop(L, 1);
+    lua_newtable(L);
+    lua_pushstring(L, name);
+    lua_pushvalue(L, -2);
+    lua_settable(L, abs_i);
+    return 0;
+}
+
+int lua_absindex(lua_State* L, int i) {
+    if (i < 0 && i > LUA_REGISTRYINDEX)
+        i += lua_gettop(L) + 1;
+    return i;
+}
+
+#if !defined LUAJIT_VERSION
+void* luaL_testudata(lua_State* L, int index, const char* tname) {
+    void* ud = lua_touserdata(L, index);
+    if (ud)
+    {
+        if (lua_getmetatable(L, index))
+        {
+            luaL_getmetatable(L, tname);
+            if (!lua_rawequal(L, -1, -2))
+                ud = NULL;
+            lua_pop(L, 2);
+            return ud;
+        }
+    }
+    return NULL;
+}
+
+void luaL_setmetatable(lua_State* L, const char* tname) {
+    lua_pushstring(L, tname);
+    lua_rawget(L, LUA_REGISTRYINDEX);
+    lua_setmetatable(L, -2);
+}
+#endif
+#endif

src/LuaEngine/ElunaCompat.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2010 - 2024 Eluna Lua Engine <https://elunaluaengine.github.io/>
+ * This program is free software licensed under GPL version 3
+ * Please see the included DOCS/LICENSE.md for more information
+ */
+
+#ifndef ELUNACOMPAT_H
+#define ELUNACOMPAT_H
+
+extern "C"
+{
+#include "lua.h"
+#include "lauxlib.h"
+};
+
+/* Compatibility layer for compiling with Lua 5.1 or LuaJIT */
+#if LUA_VERSION_NUM == 501
+    int luaL_getsubtable(lua_State* L, int i, const char* name);
+    const char* luaL_tolstring(lua_State* L, int idx, size_t* len);
+    int lua_absindex(lua_State* L, int i);
+    #define lua_pushglobaltable(L) \
+        lua_pushvalue((L), LUA_GLOBALSINDEX)
+    #define lua_rawlen(L, idx) \
+        lua_objlen(L, idx)
+    #define lua_pushunsigned(L, u) \
+        lua_pushinteger(L, u)
+    #define lua_load(L, buf_read, dec_buf, str, NULL) \
+        lua_load(L, buf_read, dec_buf, str)
+
+#if !defined LUAJIT_VERSION
+    void* luaL_testudata(lua_State* L, int index, const char* tname);
+    void luaL_setmetatable(lua_State* L, const char* tname);
+    #define luaL_setfuncs(L, l, n) luaL_register(L, NULL, l)
+#endif
+#endif
+
+#if LUA_VERSION_NUM > 502
+    #define lua_dump(L, writer, data) \
+        lua_dump(L, writer, data, 0)
+    #define lua_pushunsigned(L, u) \
+        lua_pushinteger(L, u)
+#endif
+#endif

src/LuaEngine/ElunaTemplate.h

@@ -14,6 +14,7 @@ extern "C"
 #include "lauxlib.h"
 };
 #include "LuaEngine.h"
+#include "ElunaCompat.h"
 #include "ElunaUtility.h"
 #include "SharedDefines.h"
 

src/LuaEngine/LuaEngine.cpp

@@ -8,6 +8,7 @@
 #include "LuaEngine.h"
 #include "BindingMap.h"
 #include "Chat.h"
+#include "ElunaCompat.h"
 #include "ElunaEventMgr.h"
 #include "ElunaIncludes.h"
 #include "ElunaTemplate.h"

src/LuaEngine/lmarshal.cpp

@@ -32,6 +32,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <cstdint>
+#include "ElunaCompat.h"
 
 extern "C" {
 #include "lua.h"