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nlua.c
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nlua.c
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/*
* See Licensing and Copyright notice in naev.h
*/
/**
* @file nlua.c
*
* @brief Handles creating and setting up basic Lua environments.
*/
#include "nlua.h"
#include "naev.h"
#include "nluadef.h"
#include "log.h"
#include "ndata.h"
#include "nlua_rnd.h"
#include "nlua_faction.h"
#include "nlua_var.h"
#include "nlua_naev.h"
#include "nlua_planet.h"
#include "nlua_system.h"
#include "nlua_jump.h"
#include "nlua_time.h"
#include "nlua_news.h"
#include "nlua_player.h"
#include "nlua_pilot.h"
#include "nlua_vec2.h"
#include "nlua_diff.h"
#include "nlua_outfit.h"
#include "nlua_commodity.h"
#include "nlua_cli.h"
#include "nstring.h"
lua_State *naevL = NULL;
nlua_env __NLUA_CURENV = LUA_NOREF;
/*
* prototypes
*/
static int nlua_packfileLoader( lua_State* L );
lua_State *nlua_newState (void); /* creates a new state */
int nlua_loadBasic( lua_State* L );
int nlua_errTrace( lua_State *L );
/*
* @brief Initializes the global Lua state.
*/
void lua_init(void) {
naevL = nlua_newState();
nlua_loadBasic(naevL);
}
/*
* @brief Closes the global Lua state.
*/
void lua_exit(void) {
lua_close(naevL);
naevL = NULL;
}
/*
* @brief Run code from buffer in Lua environment.
*
* @param env Lua environment.
* @param buff Pointer to buffer.
* @param sz Size of buffer.
* @param name Name to use in error messages.
*/
int nlua_dobufenv(nlua_env env,
const char *buff,
size_t sz,
const char *name) {
if (luaL_loadbuffer(naevL, buff, sz, name) != 0)
return -1;
nlua_pushenv(env);
lua_setfenv(naevL, -2);
if (nlua_pcall(env, 0, LUA_MULTRET) != 0)
return -1;
return 0;
}
/*
* @brief Run code a file in Lua environment.
*
* @param env Lua environment.
* @param filename Filename of Lua script.
*/
int nlua_dofileenv(nlua_env env, const char *filename) {
if (luaL_loadfile(naevL, filename) != 0)
return -1;
nlua_pushenv(env);
lua_setfenv(naevL, -2);
if (nlua_pcall(env, 0, LUA_MULTRET) != 0)
return -1;
return 0;
}
/*
* @brief Create an new environment in global Lua state.
*
* An "environment" is a table used with setfenv for sandboxing.
*
* @param rw Load libraries in read/write mode.
*/
nlua_env nlua_newEnv(int rw) {
nlua_env ref;
lua_newtable(naevL);
lua_pushvalue(naevL, -1);
ref = luaL_ref(naevL, LUA_REGISTRYINDEX);
/* Metatable */
lua_newtable(naevL);
lua_pushvalue(naevL, LUA_GLOBALSINDEX);
lua_setfield(naevL, -2, "__index");
lua_setmetatable(naevL, -2);
/* Replace include() function with one that considers fenv */
lua_pushvalue(naevL, -1);
lua_pushcclosure(naevL, nlua_packfileLoader, 1);
lua_setfield(naevL, -2, "include");
/* Some code expect _G to be it's global state, so don't inherit it */
lua_pushvalue(naevL, -1);
lua_setfield(naevL, -2, "_G");
lua_pushboolean(naevL, rw);
lua_setfield(naevL, -2, "__RW");
lua_pop(naevL, 1);
return ref;
}
/*
* @brief Frees an environment created with nlua_newEnv()
*
* @param env Enviornment to free.
*/
void nlua_freeEnv(nlua_env env) {
if (naevL != NULL)
luaL_unref(naevL, LUA_REGISTRYINDEX, env);
}
/*
* @brief Push environment table to stack
*
* @param env Environment.
*/
void nlua_pushenv(nlua_env env) {
lua_rawgeti(naevL, LUA_REGISTRYINDEX, env);
}
/*
* @brief Gets variable from enviornment and pushes it to stack
*
* This is meant to replace lua_getglobal()
*
* @param env Environment.
* @param name Name of variable.
*/
void nlua_getenv(nlua_env env, const char *name) {
nlua_pushenv(env); /* env */
lua_getfield(naevL, -1, name); /* env, value */
lua_remove(naevL, -2); /* value */
}
/*
* @brief Pops a value from the stack and sets it in the environment.
*
* This is meant to replace lua_setglobal()
*
* @param env Environment.
* @param name Name of variable.
*/
void nlua_setenv(nlua_env env, const char *name) {
/* value */
nlua_pushenv(env); /* value, env */
lua_insert(naevL, -2); /* env, value */
lua_setfield(naevL, -2, name); /* env */
lua_pop(naevL, 1); /* */
}
/*
* @brief Registers C functions as lua library in environment
*
* This is meant to replace luaL_register()
*
* @param env Environment.
* @param libname Name of library table.
* @param l Array of functions to register.
* @param metatable Library will be used as metatable (so register __index).
*/
void nlua_register(nlua_env env, const char *libname,
const luaL_Reg *l, int metatable) {
if (luaL_newmetatable(naevL, libname)) {
if (metatable) {
lua_pushvalue(naevL,-1);
lua_setfield(naevL,-2,"__index");
}
luaL_register(naevL, NULL, l);
}
nlua_setenv(env, libname);
}
/**
* @brief Wrapper around luaL_newstate.
*
* @return A newly created lua_State.
*/
lua_State *nlua_newState (void)
{
lua_State *L;
/* try to create the new state */
L = luaL_newstate();
if (L == NULL) {
WARN("Failed to create new Lua state.");
return NULL;
}
return L;
}
/**
* @brief Loads specially modified basic stuff.
*
* @param L Lua State to load the basic stuff into.
* @return 0 on success.
*/
int nlua_loadBasic( lua_State* L )
{
int i;
const char *override[] = { /* unsafe functions */
"collectgarbage",
"dofile",
"getfenv",
"load",
"loadfile",
"loadstring",
"setfenv",
NULL
};
luaL_openlibs(L);
/* replace non-safe functions */
for (i=0; override[i]!=NULL; i++) {
lua_pushnil(L);
lua_setglobal(L, override[i]);
}
/* Override print to print in the console. */
lua_register(L, "print", cli_print);
lua_register(L, "warn", cli_warn);
/* add our own */
lua_pushvalue(L, LUA_GLOBALSINDEX);
lua_pushcclosure(L, nlua_packfileLoader, 1);
lua_setglobal(L, "include");
return 0;
}
/**
* @brief include( string module )
*
* Loads a module into the current Lua state from inside the data file.
*
* @param module Name of the module to load.
* @return The return value of the chunk, or true.
*/
static int nlua_packfileLoader( lua_State* L )
{
const char *filename;
char *path_filename;
char *buf;
int len;
size_t bufsize;
int envtab;
/* Environment table to load module into */
envtab = lua_upvalueindex(1);
/* Get parameters. */
filename = luaL_checkstring(L,1);
/* Check to see if already included. */
lua_getfield( L, envtab, "_include" ); /* t */
if (!lua_isnil(L,-1)) {
lua_getfield(L,-1,filename); /* t, f */
/* Already included. */
if (!lua_isnil(L,-1)) {
lua_remove(L, -2); /* val */
return 1;
}
lua_pop(L,2); /* */
}
/* Must create new _include table. */
else {
lua_newtable(L); /* t */
lua_setfield(L, envtab, "_include"); /* */
}
/* Try to locate the data directly */
buf = NULL;
if (ndata_exists( filename ))
buf = ndata_read( filename, &bufsize );
/* If failed to load or doesn't exist try again with INCLUDE_PATH prefix. */
if (buf == NULL) {
/* Try to locate the data in the data path */
len = strlen(LUA_INCLUDE_PATH)+strlen(filename)+2;
path_filename = malloc( len );
nsnprintf( path_filename, len, "%s%s", LUA_INCLUDE_PATH, filename );
if (ndata_exists( path_filename ))
buf = ndata_read( path_filename, &bufsize );
free( path_filename );
}
/* Must have buf by now. */
if (buf == NULL) {
DEBUG("include(): %s not found in ndata.", filename);
luaL_error(L, "include(): %s not found in ndata.", filename);
return 1;
}
if (luaL_loadbuffer(L, buf, bufsize, filename) != 0) {
lua_error(L);
return 1;
}
lua_pushvalue(L, envtab);
lua_setfenv(L, -2);
/* run the buffer */
if (lua_pcall(L, 0, 1, 0) != 0) {
/* will push the current error from the dobuffer */
lua_error(L);
return 1;
}
/* Mark as loaded. */
/* val */
if (lua_isnil(L,-1)) {
lua_pop(L, 1);
lua_pushboolean(L, 1);
}
lua_getfield(L, envtab, "_include"); /* val, t */
lua_pushvalue(L, -2); /* val, t, val */
lua_setfield(L, -2, filename); /* val, t */
lua_pop(L, 1); /* val */
/* cleanup, success */
free(buf);
return 1;
}
/**
* @brief Loads the standard Naev Lua API.
*
* Loads the modules:
* - naev
* - var
* - space
* - planet
* - system
* - jumps
* - time
* - player
* - pilot
* - rnd
* - diff
* - faction
* - vec2
* - outfit
* - commodity
*
* Only is missing:
* - misn
* - tk
* - hook
* - music
* - ai
*
* @param L Lua Environment to load modules into.
* @return 0 on success.
*/
int nlua_loadStandard( nlua_env env )
{
int r;
r = 0;
r |= nlua_loadNaev(env);
r |= nlua_loadVar(env);
r |= nlua_loadPlanet(env);
r |= nlua_loadSystem(env);
r |= nlua_loadJump(env);
r |= nlua_loadTime(env);
r |= nlua_loadPlayer(env);
r |= nlua_loadPilot(env);
r |= nlua_loadRnd(env);
r |= nlua_loadDiff(env);
r |= nlua_loadFaction(env);
r |= nlua_loadVector(env);
r |= nlua_loadOutfit(env);
r |= nlua_loadCommodity(env);
r |= nlua_loadNews(env);
return r;
}
/**
* @brief Gets a trace from Lua.
*/
int nlua_errTrace( lua_State *L )
{
/* Handle special done case. */
const char *str = luaL_checkstring(L,1);
if (strcmp(str,NLUA_DONE)==0)
return 1;
/* Otherwise execute "debug.traceback( str, int )". */
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;
}
/*
* @brief Wrapper around lua_pcall() that handles errors and enviornments
*
* @param env Environment.
* @param nargs Number of arguments to pass.
* @param nresults Number of return values to take.
*/
int nlua_pcall( nlua_env env, int nargs, int nresults ) {
int errf, ret, top, prev_env;
#if DEBUGGING
top = lua_gettop(naevL);
lua_pushcfunction(naevL, nlua_errTrace);
lua_insert(naevL, -2-nargs);
errf = -2-nargs;
#else /* DEBUGGING */
errf = 0;
#endif /* DEBUGGING */
prev_env = __NLUA_CURENV;
__NLUA_CURENV = env;
ret = lua_pcall(naevL, nargs, nresults, errf);
__NLUA_CURENV = prev_env;
#if DEBUGGING
lua_remove(naevL, top-nargs);
#endif /* DEBUGGING */
return ret;
}