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#include <lauxlib.h>
#include <stdio.h>
#include "except.h"
static int global_try(lua_State *L);
static int global_protect(lua_State *L);
static int protected(lua_State *L);
static luaL_reg func[] = {
{"try", global_try},
{"protect", global_protect},
{NULL, NULL}
};
/*-------------------------------------------------------------------------*\
* Exception handling: try method
\*-------------------------------------------------------------------------*/
static int global_try(lua_State *L) {
if (lua_isnil(L, 1) || (lua_isboolean(L, 1) && !lua_toboolean(L, 1))) {
lua_settop(L, 2);
lua_error(L);
return 0;
} else return lua_gettop(L);
}
/*-------------------------------------------------------------------------*\
* Exception handling: protect factory
\*-------------------------------------------------------------------------*/
static int protected(lua_State *L) {
lua_pushvalue(L, lua_upvalueindex(1));
lua_insert(L, 1);
if (lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0) != 0) {
lua_pushnil(L);
lua_insert(L, 1);
return 2;
} else return lua_gettop(L);
}
static int global_protect(lua_State *L) {
lua_insert(L, 1);
lua_pushcclosure(L, protected, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Init module
\*-------------------------------------------------------------------------*/
int except_open(lua_State *L) {
luaL_openlib(L, NULL, func, 0);
return 0;
}
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