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#include "nebu_scripting.h"
#include "lua.h"
#include "lualib.h"
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// static lua_State *L;
lua_State *L;
extern void init_c_interface(lua_State *L);
void scripting_Init() {
L = lua_open(0);
lua_baselibopen(L);
lua_strlibopen(L);
lua_iolibopen(L);
// init_c_interface(L);
}
void scripting_Quit() {
lua_close(L);
}
void showStack() {
int i;
printf("dumping stack with %d elements\n", lua_gettop(L));
for(i = 0; i < lua_gettop(L); i++) {
int type = lua_type(L, - (i+1));
switch(type) {
case LUA_TNIL: printf("nil\n"); break;
case LUA_TNUMBER: printf("number\n"); break;
case LUA_TSTRING: printf("string\n"); break;
case LUA_TTABLE: printf("table\n"); break;
case LUA_TFUNCTION: printf("function\n"); break;
case LUA_TUSERDATA: printf("userdata\n"); break;
}
}
}
int scripting_IsNilResult() {
int result = lua_isnil(L, -1);
lua_pop(L, 1);
return result;
}
int getGlobal(const char *s, va_list ap) {
int top = lua_gettop(L);
int count = 0;
while(s) {
lua_pushstring(L, s);
lua_gettable(L, -2);
count++;
s = va_arg(ap, char *);
}
lua_insert(L, top); /* move result to bottom */
lua_pop(L, count); /* restore stack */
return 0;
}
int scripting_GetGlobal(const char *global, const char *s, ...) {
lua_getglobal(L, global);
if(s) {
va_list ap;
va_start(ap, s);
getGlobal(s, ap);
va_end(ap);
}
return 0;
}
int scripting_SetFloat(float f, const char *name, const char *global, const char *s, ...) {
va_list ap;
if(global == NULL) {
lua_pushnumber(L, f);
lua_setglobal(L, global);
return 0;
}
lua_getglobal(L, global);
if(s) {
va_start(ap, s);
getGlobal(s, ap);
va_end(ap);
}
lua_pushstring(L, name);
lua_pushnumber(L, f);
lua_settable(L, -3);
lua_pop(L, 1);
return 0;
}
int scripting_GetFloatResult(float *f) {
if(lua_isnumber(L, -1)) {
*f = lua_tonumber(L, -1);
lua_pop(L, 1); /* restore stack */
return 0;
} else {
showStack();
return 1;
}
}
int scripting_GetIntegerResult(int *i) {
if(lua_isnumber(L, -1)) {
*i = (int)lua_tonumber(L, -1);
lua_pop(L, 1); /* restore stack */
return 0;
} else {
showStack();
return 1;
}
}
void scripting_GetFloatArrayResult(float *f, int n) {
int i;
for(i = 0; i < n; i++) {
lua_rawgeti(L, -1, i + 1);
if(lua_isnumber(L, -1)) {
*(f + i) = (float)lua_tonumber(L, 2);
} else {
fprintf(stderr, "element %d is not number!\n", i);
}
lua_pop(L, 1); /* remove number from stack */
}
lua_pop(L, 1); /* remove table from stack */
}
int scripting_GetStringResult(char **s) {
int status;
if(lua_isstring(L, -1)) {
int size;
status = 0;
size = lua_strlen(L, -1) + 1;
*s = malloc( size );
memcpy( *s, lua_tostring(L, -1), size );
/* printf("allocated string '%s' of size %d\n", *s, size); */
} else
status = 1;
lua_pop(L, 1);
return status;
}
int scripting_CopyStringResult(char *s, int len) {
int status;
if(lua_isstring(L, -1)) {
int size, copy;
status = 0;
size = lua_strlen(L, -1) + 1;
if(size > len) { copy = len; status = 2; }
else copy = size;
memcpy( s, lua_tostring(L, -1), size );
} else
status = 1;
lua_pop(L, 1);
return status;
}
void scripting_RunFile(char *name) {
lua_dofile(L, name);
}
void scripting_Run(char *command) {
/* fprintf(stderr, "[command] %s\n", command); */
lua_dostring(L, command);
}
void scripting_RunFormat(char *format, ... ) {
char buf[4096];
va_list ap;
va_start(ap, format);
vsprintf(buf, format, ap);
va_end(ap);
scripting_Run(buf);
}
void scripting_RunGC() {
lua_setgcthreshold(L, 0);
}
void Scripting_Idle() {
scripting_RunGC();
}
void scripting_Register(const char *name, int(*func) (lua_State *L)) {
lua_register(L, name, func);
}
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