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/*
** $Id: ldblib.c,v 1.2 2001/11/26 23:00:23 darkgod Exp $
** Interface from Lua to its debug API
** See Copyright Notice in lua.h
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "luadebug.h"
#include "lualib.h"
static void settabss (lua_State *L, const char *i, const char *v) {
lua_pushstring(L, i);
lua_pushstring(L, v);
lua_settable(L, -3);
}
static void settabsi (lua_State *L, const char *i, int v) {
lua_pushstring(L, i);
lua_pushnumber(L, v);
lua_settable(L, -3);
}
static int getinfo (lua_State *L) {
lua_Debug ar;
const char *options = luaL_opt_string(L, 2, "flnSu");
char buff[20];
if (lua_isnumber(L, 1)) {
if (!lua_getstack(L, (int)lua_tonumber(L, 1), &ar)) {
lua_pushnil(L); /* level out of range */
return 1;
}
}
else if (lua_isfunction(L, 1)) {
lua_pushvalue(L, 1);
sprintf(buff, ">%.10s", options);
options = buff;
}
else
luaL_argerror(L, 1, "function or level expected");
if (!lua_getinfo(L, options, &ar))
luaL_argerror(L, 2, "invalid option");
lua_newtable(L);
for (; *options; options++) {
switch (*options) {
case 'S':
settabss(L, "source", ar.source);
if (ar.source)
settabss(L, "short_src", ar.short_src);
settabsi(L, "linedefined", ar.linedefined);
settabss(L, "what", ar.what);
break;
case 'l':
settabsi(L, "currentline", ar.currentline);
break;
case 'u':
settabsi(L, "nups", ar.nups);
break;
case 'n':
settabss(L, "name", ar.name);
settabss(L, "namewhat", ar.namewhat);
break;
case 'f':
lua_pushstring(L, "func");
lua_pushvalue(L, -3);
lua_settable(L, -3);
break;
}
}
return 1; /* return table */
}
static int getlocal (lua_State *L) {
lua_Debug ar;
const char *name;
if (!lua_getstack(L, luaL_check_int(L, 1), &ar)) /* level out of range? */
luaL_argerror(L, 1, "level out of range");
name = lua_getlocal(L, &ar, luaL_check_int(L, 2));
if (name) {
lua_pushstring(L, name);
lua_pushvalue(L, -2);
return 2;
}
else {
lua_pushnil(L);
return 1;
}
}
static int setlocal (lua_State *L) {
lua_Debug ar;
if (!lua_getstack(L, luaL_check_int(L, 1), &ar)) /* level out of range? */
luaL_argerror(L, 1, "level out of range");
luaL_checkany(L, 3);
lua_pushstring(L, lua_setlocal(L, &ar, luaL_check_int(L, 2)));
return 1;
}
/* dummy variables (to define unique addresses) */
static char key1, key2;
#define KEY_CALLHOOK (&key1)
#define KEY_LINEHOOK (&key2)
static void hookf (lua_State *L, void *key) {
lua_getregistry(L);
lua_pushuserdata(L, key);
lua_gettable(L, -2);
if (lua_isfunction(L, -1)) {
lua_pushvalue(L, 1);
lua_rawcall(L, 1, 0);
}
else
lua_pop(L, 1); /* pop result from gettable */
lua_pop(L, 1); /* pop table */
}
static void callf (lua_State *L, lua_Debug *ar) {
lua_pushstring(L, ar->event);
hookf(L, KEY_CALLHOOK);
}
static void linef (lua_State *L, lua_Debug *ar) {
lua_pushnumber(L, ar->currentline);
hookf(L, KEY_LINEHOOK);
}
static void sethook (lua_State *L, void *key, lua_Hook hook,
lua_Hook (*sethookf)(lua_State * L, lua_Hook h)) {
lua_settop(L, 1);
if (lua_isnil(L, 1))
(*sethookf)(L, NULL);
else if (lua_isfunction(L, 1))
(*sethookf)(L, hook);
else
luaL_argerror(L, 1, "function expected");
lua_getregistry(L);
lua_pushuserdata(L, key);
lua_pushvalue(L, -1); /* dup key */
lua_gettable(L, -3); /* get old value */
lua_pushvalue(L, -2); /* key (again) */
lua_pushvalue(L, 1);
lua_settable(L, -5); /* set new value */
}
static int setcallhook (lua_State *L) {
sethook(L, KEY_CALLHOOK, callf, lua_setcallhook);
return 1;
}
static int setlinehook (lua_State *L) {
sethook(L, KEY_LINEHOOK, linef, lua_setlinehook);
return 1;
}
static const struct luaL_reg dblib[] = {
{"getlocal", getlocal},
{"getinfo", getinfo},
{"setcallhook", setcallhook},
{"setlinehook", setlinehook},
{"setlocal", setlocal}
};
LUALIB_API void lua_dblibopen (lua_State *L) {
luaL_openl(L, dblib);
}
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