3 files changed, 54 insertions, 17 deletions

diff --git a/src/script/common/c_converter.cpp b/src/script/common/c_converter.cpp
index 0ee5afa3e..dfd3f5cea 100644
--- a/src/script/common/c_converter.cpp
+++ b/src/script/common/c_converter.cpp
@@ -113,21 +113,6 @@ v2s16 read_v2s16(lua_State *L, int index)
 	return p;
 }
 
-v2s16 check_v2s16(lua_State *L, int index)
-{
-	v2s16 p;
-	CHECK_POS_TAB(index);
-	lua_getfield(L, index, "x");
-	CHECK_POS_COORD("x");
-	p.X = lua_tonumber(L, -1);
-	lua_pop(L, 1);
-	lua_getfield(L, index, "y");
-	CHECK_POS_COORD("y");
-	p.Y = lua_tonumber(L, -1);
-	lua_pop(L, 1);
-	return p;
-}
-
 void push_v2s16(lua_State *L, v2s16 p)
 {
 	lua_newtable(L);
diff --git a/src/script/common/c_converter.h b/src/script/common/c_converter.h
index 04fdb353a..87bc35ac6 100644
--- a/src/script/common/c_converter.h
+++ b/src/script/common/c_converter.h
@@ -100,8 +100,6 @@ void               setboolfield(lua_State *L, int table,
                              const char *fieldname, bool value);
 
 v3f                 checkFloatPos       (lua_State *L, int index);
-v2f                 check_v2f           (lua_State *L, int index);
-v2s16               check_v2s16         (lua_State *L, int index);
 v3f                 check_v3f           (lua_State *L, int index);
 v3s16               check_v3s16         (lua_State *L, int index);
 
diff --git a/src/script/common/helper.cpp b/src/script/common/helper.cpp
index 9adc56a65..59bde57ab 100644
--- a/src/script/common/helper.cpp
+++ b/src/script/common/helper.cpp
@@ -20,7 +20,26 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "helper.h"
 #include <cmath>
 #include <sstream>
+#include <irr_v2d.h>
 #include "c_types.h"
+#include "c_internal.h"
+
+// imported from c_converter.cpp with pure C++ style
+static inline void check_lua_type(lua_State *L, int index, const char *name, int type)
+{
+	int t = lua_type(L, index);
+	if (t != type) {
+		std::string traceback = script_get_backtrace(L);
+		throw LuaError(std::string("Invalid ") + (name) + " (expected " +
+				lua_typename(L, (type)) + " got " + lua_typename(L, t) +
+				").\n" + traceback);
+	}
+}
+
+// imported from c_converter.cpp
+#define CHECK_POS_COORD(name)                                                            \
+	check_lua_type(L, -1, "position coordinate '" name "'", LUA_TNUMBER)
+#define CHECK_POS_TAB(index) check_lua_type(L, index, "position", LUA_TTABLE)
 
 bool LuaHelper::isNaN(lua_State *L, int idx)
 {
@@ -43,6 +62,11 @@ template <> bool LuaHelper::readParam(lua_State *L, int index, const bool &defau
 	return lua_toboolean(L, index) != 0;
 }
 
+template <> s16 LuaHelper::readParam(lua_State *L, int index)
+{
+	return lua_tonumber(L, index);
+}
+
 template <> float LuaHelper::readParam(lua_State *L, int index)
 {
 	if (isNaN(L, index))
@@ -51,6 +75,36 @@ template <> float LuaHelper::readParam(lua_State *L, int index)
 	return (float)luaL_checknumber(L, index);
 }
 
+template <> v2s16 LuaHelper::readParam(lua_State *L, int index)
+{
+	v2s16 p;
+	CHECK_POS_TAB(index);
+	lua_getfield(L, index, "x");
+	CHECK_POS_COORD("x");
+	p.X = readParam<s16>(L, -1);
+	lua_pop(L, 1);
+	lua_getfield(L, index, "y");
+	CHECK_POS_COORD("y");
+	p.Y = readParam<s16>(L, -1);
+	lua_pop(L, 1);
+	return p;
+}
+
+template <> v2f LuaHelper::readParam(lua_State *L, int index)
+{
+	v2f p;
+	CHECK_POS_TAB(index);
+	lua_getfield(L, index, "x");
+	CHECK_POS_COORD("x");
+	p.X = readParam<float>(L, -1);
+	lua_pop(L, 1);
+	lua_getfield(L, index, "y");
+	CHECK_POS_COORD("y");
+	p.Y = readParam<float>(L, -1);
+	lua_pop(L, 1);
+	return p;
+}
+
 template <> std::string LuaHelper::readParam(lua_State *L, int index)
 {
 	std::string result;