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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "common/c_internal.h"
#include "debug.h"
std::string script_get_backtrace(lua_State *L)
{
std::string s;
lua_getglobal(L, "debug");
if(lua_istable(L, -1)){
lua_getfield(L, -1, "traceback");
if(lua_isfunction(L, -1)) {
lua_call(L, 0, 1);
if(lua_isstring(L, -1)){
s = lua_tostring(L, -1);
}
}
lua_pop(L, 1);
}
lua_pop(L, 1);
return s;
}
int script_error_handler(lua_State *L) {
lua_getglobal(L, "debug");
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
return 1;
}
lua_getfield(L, -1, "traceback");
if (!lua_isfunction(L, -1)) {
lua_pop(L, 2);
return 1;
}
lua_pushvalue(L, 1);
lua_pushinteger(L, 2);
lua_call(L, 2, 1);
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);
std::string str(s ? s : "");
throw LuaError(str);
}
// Push the list of callbacks (a lua table).
// Then push nargs arguments.
// Then call this function, which
// - runs the callbacks
// - replaces the table and arguments with the return value,
// computed depending on mode
void script_run_callbacks(lua_State *L, int nargs, RunCallbacksMode mode)
{
assert(lua_gettop(L) >= nargs + 1);
// Insert error handler
lua_pushcfunction(L, script_error_handler);
int errorhandler = lua_gettop(L) - nargs - 1;
lua_insert(L, errorhandler);
// Insert minetest.run_callbacks between error handler and table
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "run_callbacks");
lua_remove(L, -2);
lua_insert(L, errorhandler + 1);
// Insert mode after table
lua_pushnumber(L, (int) mode);
lua_insert(L, errorhandler + 3);
// Stack now looks like this:
// ... <error handler> <run_callbacks> <table> <mode> <arg#1> <arg#2> ... <arg#n>
if (lua_pcall(L, nargs + 2, 1, errorhandler)) {
script_error(L);
}
lua_remove(L, -2); // Remove error handler
}
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