Handle LuaErrors in Lua -> C++ calls on LuaJIT

src/script/common/c_content.cpp

@@ -653,7 +653,7 @@ ItemStack read_item(lua_State* L, int index,Server* srv)
 	}
 	else
 	{
-		throw LuaError(L, "Expecting itemstack, itemstring, table or nil");
+		throw LuaError(NULL, "Expecting itemstack, itemstring, table or nil");
 	}
 }
 

src/script/common/c_internal.cpp

@@ -55,6 +55,18 @@ int script_error_handler(lua_State *L) {
 	return 1;
 }
 
+int script_exception_wrapper(lua_State *L, lua_CFunction f)
+{
+	try {
+		return f(L);  // Call wrapped function and return result.
+	} catch (const char *s) {  // Catch and convert exceptions.
+		lua_pushstring(L, s);
+	} catch (LuaError& e) {
+		lua_pushstring(L, e.what());
+	}
+	return lua_error(L);  // Rethrow as a Lua error.
+}
+
 void script_error(lua_State *L)
 {
 	const char *s = lua_tostring(L, -1);

src/script/common/c_internal.h

@@ -66,6 +66,7 @@ enum RunCallbacksMode
 
 std::string script_get_backtrace(lua_State *L);
 int script_error_handler(lua_State *L);
+int script_exception_wrapper(lua_State *L, lua_CFunction f);
 void script_error(lua_State *L);
 void script_run_callbacks(lua_State *L, int nargs,
 		RunCallbacksMode mode);

src/script/common/c_types.cpp

@@ -23,10 +23,12 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "common/c_internal.h"
 #include "itemdef.h"
 
-LuaError::LuaError(lua_State *L, const std::string &s)
+LuaError::LuaError(lua_State *L, const std::string &s) :
+	ServerError(s)
 {
-	m_s = "LuaError: " + s;
-	if (L) m_s += '\n' + script_get_backtrace(L);
+	if (L) {
+		m_s += '\n' + script_get_backtrace(L);
+	}
 }
 
 struct EnumString es_ItemType[] =

src/script/common/c_types.h

@@ -26,6 +26,8 @@ extern "C" {
 
 #include <iostream>
 
+#include "exceptions.h"
+
 struct EnumString
 {
 	int num;
@@ -50,7 +52,7 @@ public:
 	}
 };
 
-class LuaError : public std::exception
+class LuaError : public ServerError
 {
 public:
 	LuaError(lua_State *L, const std::string &s);
@@ -61,7 +63,6 @@ public:
 	{
 		return m_s.c_str();
 	}
-	std::string m_s;
 };