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/*
** $Id: ldblib.c,v 1.9 1999/12/21 18:04:41 roberto Exp roberto $
** Interface from Lua to its debug API
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#include <string.h>
#define LUA_REENTRANT
#include "lauxlib.h"
#include "lua.h"
#include "luadebug.h"
#include "lualib.h"
static void settabss (lua_State *L, lua_Object t, const char *i, const char *v) {
lua_pushobject(L, t);
lua_pushstring(L, i);
lua_pushstring(L, v);
lua_settable(L);
}
static void settabsi (lua_State *L, lua_Object t, const char *i, int v) {
lua_pushobject(L, t);
lua_pushstring(L, i);
lua_pushnumber(L, v);
lua_settable(L);
}
static void settabso (lua_State *L, lua_Object t, const char *i, lua_Object v) {
lua_pushobject(L, t);
lua_pushstring(L, i);
lua_pushobject(L, v);
lua_settable(L);
}
static void getstack (lua_State *L) {
lua_Dbgactreg ar;
if (!lua_getstack(L, luaL_check_int(L, 1), &ar)) /* level out of range? */
return;
else {
const char *options = luaL_check_string(L, 2);
lua_Object res = lua_createtable(L);
if (!lua_getinfo(L, options, &ar))
luaL_argerror(L, 2, "invalid option");
for ( ;*options; options++) {
switch (*options) {
case 'S':
settabss(L, res, "source", ar.source);
settabsi(L, res, "linedefined", ar.linedefined);
settabss(L, res, "what", ar.what);
break;
case 'l':
settabsi(L, res, "currentline", ar.currentline);
break;
case 'u':
settabsi(L, res, "nups", ar.nups);
break;
case 'n':
settabss(L, res, "name", ar.name);
settabss(L, res, "namewhat", ar.namewhat);
break;
case 'f':
settabso(L, res, "func", ar.func);
break;
}
}
lua_pushobject(L, res);
}
}
static void getlocal (lua_State *L) {
lua_Dbgactreg ar;
lua_Dbglocvar lvar;
if (!lua_getstack(L, luaL_check_int(L, 1), &ar)) /* level out of range? */
luaL_argerror(L, 1, "level out of range");
lvar.index = luaL_check_int(L, 2);
if (lua_getlocal(L, &ar, &lvar)) {
lua_pushstring(L, lvar.name);
lua_pushobject(L, lvar.value);
}
}
static void setlocal (lua_State *L) {
lua_Dbgactreg ar;
lua_Dbglocvar lvar;
if (!lua_getstack(L, luaL_check_int(L, 1), &ar)) /* level out of range? */
luaL_argerror(L, 1, "level out of range");
lvar.index = luaL_check_int(L, 2);
lvar.value = luaL_nonnullarg(L, 3);
if (lua_setlocal(L, &ar, &lvar))
lua_pushstring(L, lvar.name);
}
static int linehook = LUA_NOREF; /* Lua reference to line hook function */
static int callhook = LUA_NOREF; /* Lua reference to call hook function */
static void linef (lua_State *L, lua_Dbgactreg *ar) {
if (linehook != LUA_NOREF) {
lua_pushnumber(L, ar->currentline);
lua_callfunction(L, lua_getref(L, linehook));
}
}
static void callf (lua_State *L, lua_Dbgactreg *ar) {
if (callhook != LUA_NOREF) {
lua_pushstring(L, ar->event);
lua_callfunction(L, lua_getref(L, callhook));
}
}
static void setcallhook (lua_State *L) {
lua_Object f = lua_getparam(L, 1);
lua_unref(L, callhook);
if (f == LUA_NOOBJECT) {
callhook = LUA_NOREF;
lua_setcallhook(L, NULL);
}
else {
lua_pushobject(L, f);
callhook = lua_ref(L, 1);
lua_setcallhook(L, callf);
}
}
static void setlinehook (lua_State *L) {
lua_Object f = lua_getparam(L, 1);
lua_unref(L, linehook);
if (f == LUA_NOOBJECT) {
linehook = LUA_NOREF;
lua_setlinehook(L, NULL);
}
else {
lua_pushobject(L, f);
linehook = lua_ref(L, 1);
lua_setlinehook(L, linef);
}
}
static const struct luaL_reg dblib[] = {
{"getlocal", getlocal},
{"getstack", getstack},
{"setcallhook", setcallhook},
{"setlinehook", setlinehook},
{"setlocal", setlocal}
};
void lua_dblibopen (lua_State *L) {
luaL_openl(L, dblib);
}
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