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lua.c
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269 lines (198 loc) · 5.61 KB
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/****************************
* DreamShell ##version## *
* lua.c *
* DreamShell LUA *
* Created by SWAT *
****************************/
#include "lua.h"
#include "list.h"
#include "module.h"
#include "utils.h"
#include "console.h"
#include "exceptions.h"
static lua_State *DSLua = NULL;
static Item_list_t *lua_libs;
void LuaOpenlibs(lua_State *L) {
/* Open stock libs */
luaL_openlibs(L);
/* Open additional libs */
lua_packlibopen(L);
/* Custom functions */
RegisterLuaFunctions(L);
Item_t *i;
LuaRegLibOpen *openFunc;
SLIST_FOREACH(i, lua_libs, list) {
openFunc = (LuaRegLibOpen *) i->data;
if(openFunc != NULL) {
//ds_printf("DS_PROCESS: Opening lua library: %s\n", i->name);
EXPT_GUARD_BEGIN;
openFunc(L);
EXPT_GUARD_CATCH;
ds_printf("DS_ERROR: Can't open lua library: %s\n", i->name);
EXPT_GUARD_END;
}
}
}
int InitLua() {
//ds_printf("DS_PROCESS: Init lua library...\n");
luaB_set_fputs((void (*)(const char *))ds_printf);
DSLua = luaL_newstate();//lua_open();
if (DSLua == NULL) {
ds_printf("DS_ERROR_LUA: Invalid state.. giving up\n");
return -1;
}
if((lua_libs = listMake()) == NULL) {
return -1;
}
LuaOpenlibs(DSLua);
//ds_printf("DS_OK: Lua library inited.\n");
return 0;
}
void ShutdownLua() {
listDestroy(lua_libs, (listFreeItemFunc *) free);
lua_close(DSLua);
}
void ResetLua() {
ds_printf("DS_PROCESS: Reset lua state...\n");
lua_close(DSLua);
DSLua = luaL_newstate();
LuaOpenlibs(DSLua);
}
int RegisterLuaLib(const char *name, LuaRegLibOpen *func) {
if(listAddItem(lua_libs, LIST_ITEM_LUA_LIB, name, func, sizeof(LuaRegLibOpen)) != NULL){
return 1;
}
return 0;
}
int UnregisterLuaLib(const char *name) {
Item_t *i = listGetItemByName(lua_libs, name);
if(i == NULL) {
return 0;
}
listRemoveItem(lua_libs, i, NULL);
return 1;
}
int lua_report (lua_State *L, int status) {
if (status && !lua_isnil(L, -1)) {
const char *msg = lua_tostring(L, -1);
if (msg == NULL) msg = "(error object is not a string)";
ds_printf(msg);
lua_pop(L, 1);
}
return status;
}
int lua_traceback(lua_State *L) {
if (!lua_isstring(L, 1)) /* 'message' not a string? */
return 1; /* keep it intact */
lua_getfield(L, LUA_GLOBALSINDEX, "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); /* pass error message */
lua_pushinteger(L, 2); /* skip this function and traceback */
lua_call(L, 2, 1); /* call debug.traceback */
return 1;
}
int lua_docall (lua_State *L, int narg, int clear) {
int status;
int base = lua_gettop(L) - narg; /* function index */
lua_pushcfunction(L, lua_traceback); /* push traceback function */
lua_insert(L, base); /* put it under chunk and args */
status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
lua_remove(L, base); /* remove traceback function */
/* force a complete garbage collection in case of errors */
if (status != 0) lua_gc(L, LUA_GCCOLLECT, 0);
return status;
}
static int dofile (lua_State *L, const char *name) {
int status = luaL_loadfile(L, name) || lua_docall(L, 0, 1);
return lua_report(L, status);
}
static int dostring (lua_State *L, const char *s, const char *name) {
int status = luaL_loadbuffer(L, s, strlen(s), name) || lua_docall(L, 0, 1);
return lua_report(L, status);
}
static int dolibrary (lua_State *L, const char *name) {
lua_getglobal(L, "require");
lua_pushstring(L, name);
return lua_report(L, lua_docall(L, 1, 1));
}
int LuaDo(int type, const char *str_or_file, lua_State *lu) {
int res = LUA_ERRRUN;
EXPT_GUARD_BEGIN;
if(type == LUA_DO_FILE) {
res = dofile(lu, str_or_file);
} else if(type == LUA_DO_STRING) {
res = dostring(lu, str_or_file, "=(DreamShell)");
} else if(type == LUA_DO_LIBRARY) {
res = dolibrary(lu, str_or_file);
} else {
ds_printf("DS_ERROR: LuaDo type error: %d\n", type);
}
EXPT_GUARD_CATCH;
res = LUA_ERRRUN;
ds_printf("DS_ERROR: Exception in lua script: %s\n", str_or_file);
EXPT_GUARD_END;
/* Lua gives no message in such cases, so lua.c provides one */
if (res == LUA_ERRMEM) {
ds_printf("LUA: Memory allocation error!\n");
} else if (res == LUA_ERRFILE)
ds_printf("LUA: Can't open lua file %s\n", str_or_file);
else if (res == LUA_ERRSYNTAX)
ds_printf("LUA: Syntax error in lua script %s\n", str_or_file);
else if (res == LUA_ERRRUN)
ds_printf("LUA: Error at management chunk!\n");
else if (res == LUA_ERRERR)
ds_printf("LUA: Error in error message!\n");
return res;
}
void LuaPushArgs(lua_State *L, char *argv[]) {
int i;
lua_newtable(L);
for (i=0; argv[i]; i++) {
/* arg[i] = argv[i] */
lua_pushnumber(L, i);
lua_pushstring(L, argv[i]);
lua_settable(L, -3);
}
/* argv.n = maximum index in table `argv' */
lua_pushstring(L, "n");
lua_pushnumber(L, i-1);
lua_settable(L, -3);
}
void LuaAddArgs(lua_State *L, char *argv[]) {
LuaPushArgs(L, argv);
lua_setglobal(L, "argv");
}
int RunLuaScript(char *fn, char *argv[]) {
lua_State *L = NewLuaThread();
if(L == NULL) {
ds_printf("DS_ERROR: LUA: Invalid state.. giving up\n");
return 0;
}
if(argv != NULL) {
LuaPushArgs(L, argv);
lua_setglobal(L, "argv");
}
LuaDo(LUA_DO_FILE, fn, L);
lua_close(L);
return 1;
}
lua_State *GetLuaState() {
return DSLua;
}
void SetLuaState(lua_State *l) {
DSLua = l;
}
lua_State *NewLuaThread() {
return lua_newthread(DSLua);
//lua_State *L = lua_open();
//LuaOpenlibs(L);
//return L;
}